CN116689843B - Device and method for precisely milling process allowance of complex grid reinforcement member - Google Patents
Device and method for precisely milling process allowance of complex grid reinforcement member Download PDFInfo
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- CN116689843B CN116689843B CN202310742119.5A CN202310742119A CN116689843B CN 116689843 B CN116689843 B CN 116689843B CN 202310742119 A CN202310742119 A CN 202310742119A CN 116689843 B CN116689843 B CN 116689843B
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- 238000000034 method Methods 0.000 title claims abstract description 89
- 238000003801 milling Methods 0.000 title claims abstract description 26
- 230000002787 reinforcement Effects 0.000 title claims description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 82
- 230000008569 process Effects 0.000 claims abstract description 58
- 230000007246 mechanism Effects 0.000 claims description 29
- 230000000712 assembly Effects 0.000 claims description 11
- 238000000429 assembly Methods 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000003287 optical effect Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
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- 238000003754 machining Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2215/00—Details of workpieces
- B23C2215/04—Aircraft components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2270/00—Details of milling machines, milling processes or milling tools not otherwise provided for
- B23C2270/08—Clamping mechanisms or provision for clamping
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Abstract
The invention discloses a device and a method for precisely milling process allowance of a complex grid reinforced component. The device mills and designs the backup pad in frock cardboard top and in frock both sides to set up adjustable bolt in the backup pad, make the rigidity big deflection less in the middle of the component, also can not interfere with cardboard top in the middle of the component, and when there is the clearance between component and the backup pad, prevent cutting process vibration. In the clamping process, in order to prevent the components from being severely deformed or inclining to one side, a component symmetrical clamping method is adopted, and the clamping deformation degree is controlled by using a dial indicator. According to the invention, through design and process consideration, the chord length measured after cutting on the component machine tool is consistent with the chord length in a free state, and the phenomenon of cutting deformation rebound does not occur, so that the subsequent assembly process is facilitated.
Description
Technical Field
The invention relates to the technical field of machining of metal strap bar components, in particular to a device and a method for precisely milling process allowance of a complex grid bar-adding component.
Background
The aluminum alloy grid reinforcement member is widely applied to aerospace high-end equipment such as a carrier rocket storage tank wallboard and an airplane wing, has the advantages of strong bearing capacity, large integral rigidity and the like, and therefore the accuracy of the final size of the aluminum alloy grid reinforcement member has important significance on the safety and reliability of aerospace equipment. In the forming process, a certain process allowance is usually reserved for clamping, positioning and the like, and the metal member is removed after the forming is finished. After forming, the general components can be manually cut off by adopting a wire saw, an electric saw and the like; however, for large complex ribbed members, especially grid high ribs, the above manual method cannot be adopted to cut off the process allowance or the precision after cutting is not high, and the assembly cannot be performed.
Therefore, the invention provides the grid high-strength wallboard process allowance cutting method and the cutting tool, which realize accurate cutting of the large grid high-strength wallboard process allowance, thereby improving the safety and reliability of equipment.
Disclosure of Invention
The invention aims to provide a device for precisely milling the process allowance of a complex grid reinforcement member, which can precisely cut the process allowance of a large grid high-reinforcement wallboard, thereby improving the safety and reliability of equipment.
In order to achieve the above purpose, the invention provides a device for precisely milling the process allowance of a complex grid reinforcement member, which comprises a frame structure, a positioning structure, a supporting structure and a clamping structure; the frame structure comprises a bottom plate, a plurality of transverse clamping plates and a plurality of longitudinal clamping plates are arranged on the bottom plate in parallel along the transverse direction and the longitudinal direction, and the top surface of the frame structure is an arc-shaped supporting surface matched with the arc-shaped surface of a complex grid reinforcement member to be processed; the positioning structure comprises a circumferential positioning adjusting mechanism, an axial positioning adjusting mechanism and a positioning plate, wherein the circumferential positioning adjusting mechanism and the axial positioning adjusting mechanism are respectively positioned at two lateral sides of the frame structure; the supporting structure comprises supporting plates arranged on the periphery of the top of the frame structure and a downward sunken interference avoidance platform arranged in the center of the arc-shaped supporting surface, and a plurality of adjustable bolts are arranged on two supporting plates positioned on two lateral sides of the frame structure; the clamping structure comprises a plurality of clamping assemblies which are respectively arranged on two lateral sides of the frame structure, and the clamping assemblies and the adjustable bolts are arranged in a staggered mode.
Furthermore, the bottom plate, the transverse clamping plate and the longitudinal clamping plate are provided with a plurality of lightening holes, and the holes on the bottom plate avoid the transverse clamping plate and the longitudinal clamping plate.
Further, the two longitudinal ends of the frame structure are respectively provided with a first supporting plate, the inner sides of the first supporting plates close to one end of the axial positioning adjusting mechanism are provided with second supporting plates at intervals in parallel, and two third supporting plates are connected between the second supporting plates and the first supporting plates close to one end of the positioning plate; the cutter relieving grooves are respectively formed in the two ends of the first supporting plate, the two ends of the second supporting plate and the two ends of the top of each transverse clamping plate, and the cutter relieving grooves are located on the outer sides of the two third supporting plates.
Further, 4-6 adjustable bolts are arranged on each third supporting plate at intervals; the width of the supporting plate is 70-100 mm.
Further, the interference avoidance platform is a platform for cutting down to a depth of 10-20 mm from the center point of the arc-shaped supporting surface.
The invention also provides a method for precisely milling the process allowance of the complex grid reinforcement member, which adopts the device to cut the process allowance of the grid reinforcement member, and comprises the following steps:
s1, positioning a component: firstly, hanging a complex grid reinforced member to be processed on a milling device, enabling one end of the member in the length direction to be attached to a positioning plate through an axial positioning adjusting mechanism, and enabling the center of the member to be symmetrical through circumferential positioning adjusting mechanisms on two lateral sides of the adjusting device;
s2, fixing a component: firstly, a metal block is padded between a third supporting plate and an inner surface of a component, or an adjustable bolt on the third supporting plate is adjusted to enable the bolt to prop against the inner surface of the component; then, clamping assemblies at two lateral sides of the device are adopted to fix the component; after the fixation is completed, measuring the top Z coordinates of the central rib and at least two lateral ribs which are transversely and symmetrically arranged on the component by adopting a machine tool, and if the deviation value of the top Z coordinates of the two lateral ribs which are transversely and symmetrically arranged is within 0.5mm, indicating that the component is well positioned after the clamping and fixation; dismantling the positioning plate, and measuring the initial flatness of the side surface of the component by adopting a machine tool;
s3, rough cutting of the component: firstly, drawing lines on a final cutting line of a component by adopting a machine tool so as to prevent over-cutting; then rough cutting is carried out on the component, and a chord length process allowance of 5-10 mm is reserved on a single side during rough cutting so as to prevent serious deformation of the component caused by residual stress release; meanwhile, in order to ensure that the member still has enough rigidity in the cutting process, a plurality of process structures are reserved on the two lateral sides of the member; after rough cutting is finished, the clamping assembly is firstly removed, then the chord lengths of the two end parts of the component in the length direction are measured by adopting a machine tool, the component is lifted up to be vertical and in a free state, the chord lengths of the upper part and the lower part of the component are measured, and the chord lengths are respectively compared with the chord lengths of the two end parts measured by the machine tool;
s4, precisely cutting the component: repeating the step S1 and the step S2 to position and fix the component roughly cut in the step S3 again; carrying out multiple fine cutting on the component by adopting an average chord length method, gradually reducing the process allowance at the two lateral sides of the component until the unilateral process allowance is 0.2-0.5 mm, and finally carrying out a finishing cutter treatment to reduce the surface roughness of the part;
s5, milling the lower part: milling the lower end face of the component after finishing finish cutting of the two lateral sides of the component;
s6, precision detection: and manually cutting off the residual process structures at the two lateral sides of the component, measuring the thickness of the lower end surface of the component by adopting an ultrasonic thickness gauge, and carrying out internal surface scanning measurement accuracy after the component is vertically lifted.
Further, in the step S1, after positioning is completed, the central rib of the member is measured along the axial direction by using a machine tool to check whether the central rib is on a straight line, otherwise, the member is slightly adjusted by using a circumferential positioning adjusting mechanism until the requirement is met.
Further, in step S2, in order to prevent the component from tilting to one side during the clamping and fixing process, the symmetrical positions on two lateral sides of the component are clamped simultaneously, and when the component is clamped and fixed, the dial indicator is placed at the clamping position, and the deformation of the dial indicator is controlled within 0.5mm.
Further, in the step S4, during the first fine cutting, process margins of 0.8-1.5 mm are reserved on the two lateral sides of the component, and chord lengths of the upper part and the lower part of the component are measured on a machine tool after cutting; and then carrying out fine cutting on the two lateral sides of the component by 0.6-1 mm of process allowance each time until the single-side process allowance is 0.2-0.5 mm.
Further, the upper and lower chord deviations of the member after each cut are d; after finishing the finish cutting, the chord length of the upper part of the member is the sum of the final target chord length and half of the deviation value d, and the chord length of the lower part of the member is the difference of the final target chord length and half of the deviation value d.
Compared with the prior art, the invention has the following beneficial effects:
(1) The device for precisely milling the process allowance of the complex grid reinforced component comprises a positioning plate, a circumferential positioning adjusting mechanism and an axial positioning adjusting mechanism, and is combined with coordinate position measurement of a machine tool, so that the component is precisely positioned. Meanwhile, the high-strength member has large rigidity difference between the whole and the part, and is easy to slightly overstretch or understretch after being formed; the device is characterized in that the third supporting plates are respectively arranged on two lateral sides of the device, bolt holes are formed in the third supporting plates, and each bolt hole is internally provided with an adjusting bolt, when a gap exists between a component and the third supporting plates, in order to prevent vibration in the cutting process, the tops of the bolts can be made to prop against the component by the adjusting bolts, or metal blocks are padded between the third supporting plates and the component. In the clamping process, in order to prevent the components from being severely deformed or inclining to one side, a component symmetrical clamping method is adopted, and the clamping deformation degree is controlled by using a dial indicator. In order to ensure that the cutting process has enough rigidity, the cutting process cannot be completed, a certain margin of process structure is reserved, and the cutting process is carried out manually. In order to facilitate the assembly of the subsequent components and other parts, the components are cut by adopting an upper chord length average method and a lower chord length average method, so that errors are uniformly dispersed and cannot be concentrated in one place; meanwhile, the chord lengths of the components at different positions after being cut on the machine tool are compared with the chord lengths of the components at different positions in the vertical state, and the consistency is good. By the arrangement, the chord length measured after the member is cut on the machine tool is consistent with the chord length in a free state, and the cutting deformation rebound phenomenon is avoided, so that the subsequent assembly process is facilitated.
(2) The device for precisely milling the process allowance of the complex grid reinforcement member is provided with the cutter relieving position, and a tool is not damaged by a machine tool cutter in the cutting process; meanwhile, the milling device is also provided with a structure compatible with components with different axial lengths, and is suitable for cutting components with different lengths.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of an apparatus for precision milling of process margins for complex grid reinforcement members in accordance with the present invention;
FIG. 2 is a schematic view of the overall structure of the wall plate and device of the present invention;
FIG. 3 is a schematic view of a wall plate fixing structure according to the present invention, wherein (a) is an enlarged schematic view of the structure at M in FIG. 2, and (b) is a schematic view of a transverse cross-section at M in FIG. 2;
FIG. 4 is a schematic view of the transverse two sides (only a portion shown) of the wall panel of the present invention;
the device comprises A1-bottom plate, A2-transverse clamping plate, a 3-longitudinal clamping plate, a 4-circumferential positioning and adjusting mechanism, a 5-axial positioning and adjusting mechanism, a 6-positioning plate, a 7-supporting plate, a 7.1-first supporting plate, a 7.2-second supporting plate, a 7.3-third supporting plate, a 7 a-cutter-relieving groove, an 8-interference avoidance platform, a 9-adjustable bolt, a 10-clamping assembly, an 11-process structure, an A-complex grid reinforcement member, an A1-center rib and an A2-side rib.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.
Referring to fig. 1 to 4, a device for precisely milling process margins of a complex grid reinforcement member of the present embodiment includes a frame structure, a positioning structure, a supporting structure and a clamping structure; the specific structure is as follows:
the frame construction includes bottom plate 1, a plurality of horizontal cardboard 2 and a plurality of vertical cardboard 3, and a plurality of horizontal cardboard 2 and a plurality of vertical cardboard 3 are parallel arrangement each other on bottom plate 1 along horizontal and longitudinal direction respectively, and the grid board in a plurality of lightening hole has all been seted up to bottom plate 1, horizontal cardboard 2 and vertical cardboard 3, and the hole site of seting up on the bottom plate avoids horizontal cardboard 2 and vertical cardboard 3, foraminiferous horizontal cardboard and vertical cardboard welded connection. The top surface of the frame structure is an arc-shaped supporting surface matched with the arc-shaped surface of the complex grid reinforcement member A to be processed. The positioning structure comprises a plurality of circumferential positioning adjusting mechanisms 4, a plurality of axial positioning adjusting mechanisms 5 and a plurality of positioning plates 6, wherein the circumferential positioning adjusting mechanisms 4 are respectively arranged on two lateral sides of the frame structure, the axial positioning adjusting mechanisms 5 are arranged on one longitudinal end of the frame structure, and the positioning plates 6 are arranged on the other longitudinal end of the frame structure. Specifically, two circumferential positioning adjusting mechanisms 4 are respectively arranged on two lateral sides of the frame structure, an axial positioning adjusting mechanism 5 is arranged at one longitudinal end of the frame structure, and three positioning plates 6 are arranged at the other longitudinal end of the frame structure. The supporting structure comprises supporting plates 7 arranged on the periphery of the top of the frame structure and a downward sunken interference avoidance platform 8 arranged at the center position of an arc-shaped supporting surface (the top of the central symmetry position of the device), and a plurality of adjustable bolts 9 are arranged on the two supporting plates 7 positioned on the two lateral sides of the frame structure. The support plate 7 comprises a first support plate 7.1, a second support plate 7.2 and a third support plate 7.3, wherein the first support plate 7.1 is respectively arranged at two longitudinal ends of the frame structure, the second support plate 7.2 is arranged at an inner side parallel interval of the first support plate 7.1 close to one end of the axial positioning adjusting mechanism 5, and two third support plates 7.3 are longitudinally connected between the second support plate 7.2 and the first support plate 7.1 close to one end of the positioning plate 6. In order to avoid the damage of the machine tool cutter in the cutting process, cutter yielding grooves 7a are formed in the two ends of the two first supporting plates 7.1 and the two ends of the second supporting plates, cutter yielding grooves 7a are respectively formed in the two ends of the top of each transverse clamping plate, and the cutter yielding grooves are located in the outer sides of the two third supporting plates 7.3. The clamping structure comprises a plurality of clamping assemblies 10 which are respectively arranged on two lateral sides of the frame structure, and the clamping assemblies 10 and the adjustable bolts 9 are arranged in a staggered manner.
In a specific embodiment, 4-6 adjustable bolts 9 are arranged on each third supporting plate 7.3 at intervals; the width of all backup pads is 70~100mm. Each lateral side of the frame structure is provided with 5-8 clamping assemblies 10, and the clamping assemblies on two sides are symmetrically arranged. The interference avoidance platform 8 is a platform with the depth of 10-20 mm cut from the center point of the arc-shaped supporting surface of the top surface of the frame structure.
According to the method for precisely milling the process allowance of the complex grid reinforcement member, the device is adopted to cut the process allowance of the grid reinforcement member, and the grid reinforcement member A is a wall plate; the method comprises the following steps:
s1, positioning a wallboard: firstly, hanging a wallboard to be processed on a milling device, enabling one end of the wallboard in the length direction to be attached to a positioning plate 6 through an axial positioning and adjusting mechanism 5, and enabling the centers of the boards to be symmetrical through adjusting circumferential positioning and adjusting mechanisms 4 on two lateral sides; after the positioning is finished, the machine tool is adopted to measure the coordinates of the central rib of the wallboard along the axial direction to check whether the central rib is on a straight line, otherwise, the circumferential positioning adjusting mechanism 4 is adopted to slightly adjust the wallboard until the requirement is met, and the method is particularly shown in fig. 2.
S2, fixing the wallboard: the inner surfaces on two sides of the actually formed wallboard are not contacted with the surfaces of the fixture clamping plates, in order to prevent the wallboard from vibrating in the processing process, firstly, a metal block is arranged between the third supporting plate 7.3 and the inner surface of the wallboard, or an adjustable bolt 9 on the third supporting plate 7.3 is adjusted to enable the bolt to prop against the inner surface of the wallboard; then the clamping assemblies 10 on the two lateral sides of the device are adopted to fix the wallboard; in order to prevent the wallboard from inclining to one side in the clamping and fixing process, the symmetrical positions of the two sides of the wallboard are clamped simultaneously, and when the clamping and fixing are carried out, the dial indicator is placed at the clamping position, and the deformation of the dial indicator is controlled within 0.5mm, so that the wallboard can be compacted and also prevented from being deformed by pressing. After the fixing is finished, measuring the top Z coordinates of a central rib A1 and at least two lateral ribs A1 which are transversely and symmetrically arranged on the wallboard by adopting a machine tool, if the deviation value of the top Z coordinates of the two lateral ribs A2 which are transversely and symmetrically arranged is within 0.5mm, indicating that the wallboard is well positioned after clamping and fixing, removing the positioning plate 6 at the same time, and measuring the initial flatness of the side surface of the wallboard by adopting the machine tool; any two side ribs symmetrically arranged on two sides of the central rib can be selected, and the two side ribs are preferably positioned closer to two sides of the wallboard beam.
S3, rough cutting of the wallboard: firstly, drawing a line on a final cutting line of the wallboard by adopting a machine tool to prevent over-cutting; rough cutting is carried out on the wallboard, the deformation is serious due to the fact that residual stress release possibly occurs after the process allowance of the wallboard is cut, and the chord length process allowance of 5-10 mm is reserved on a single side during rough cutting; in order to ensure that the wall plate still has sufficient rigidity in the cutting process, a plurality of process structures 11 with the width of 20-50 mm and the thickness of 3-10 mm are reserved on two sides of the wall plate, as shown in fig. 2 and 4. The cutting sequence of the wall plate is to cut the high rib and then cut the skin; after rough cutting, the clamping assembly 10 is removed firstly, then, the chord lengths of the two end parts of the wallboard in the length direction (namely the longitudinal direction of the device) are measured by adopting a machine tool, then, the wallboard is lifted to be vertical and in a free state, the chord lengths of the upper part and the lower part are manually measured by adopting a tape measure, and are respectively compared with the chord lengths of the two end parts measured by the machine tool, the chord lengths obtained by the two measuring methods are the same, and the chord lengths obtained by the machine tool can be used for representing the chord length measured in the vertical free state. In this structural arrangement, the end of the wall plate close to the axial positioning adjustment mechanism 5 is provided with a lifting lug, which can conveniently lift the wall plate, and when the wall plate is lifted, the upper end (the end provided with the lifting lug) is referred to as "upper portion", and the lower end (the end opposite to the lifting lug) is referred to as "lower portion". Meanwhile, for convenience of subsequent description, one end provided with the lifting lug is continuously referred to as an upper portion, and the other end opposite to the upper portion is referred to as a lower portion in steps S4 to S6. When in rough cutting, the cutter is used for carrying out intermittent cutting on the process allowance on the two lateral sides of the wallboard, and the part which is not cut between two adjacent cutting lines is called a 'process structure'.
S4, precisely cutting the wallboard: and (5) repeating the step S1 and the step S2 to position and fix the rough cut wallboard. The chord lengths of the upper and lower portions after forming are slightly offset due to the different areas of the complex grid ribbed member having different rigidities. In order to facilitate subsequent assembly, the wall plate is subjected to multiple fine cutting by adopting an average chord length method, so that the process allowance on the two lateral sides of the wall plate is gradually reduced until the unilateral process allowance is 0.2-0.5 mm, and finally, the surface roughness of the part is reduced by performing a finishing cutter treatment. The method comprises the steps of carrying out primary fine cutting, reserving process allowance of 0.8-1.5 mm on two lateral sides of a wallboard, and measuring chord lengths of the upper part and the lower part of the wallboard on a machine tool after cutting; and then carrying out 0.6-1 mm of process allowance fine cutting on the two lateral sides of the wall plate each time, and measuring the chord lengths of the upper part and the lower part of the wall plate until the unilateral process allowance is 0.2-0.5 mm. The chord length deviation values of the upper part and the lower part of the member after each cutting are d; after finishing the finish cutting, the chord length of the upper part of the member is the sum of the final target chord length and half of the deviation value d, and the chord length of the lower part of the member is the difference of the final target chord length and half of the deviation value d. In a specific embodiment, the final target chord length of the member is 2500mm, the left and right sides respectively leave a chord length margin of 5mm when roughly cut, and the lower chord length is 2510mm after roughly cutting from the lower part to the upper part, and the upper chord length is 2513mm. When the fine cutting is performed, an average chord length method is adopted, and if the deviation value d of the upper chord length and the lower chord length after rough cutting is measured to be 3mm, the upper chord length is 2498.5mm and the lower chord length is 2501.5mm finally required to be obtained. When the primary fine cutting is performed, the left side and the right side are respectively provided with a chord length allowance of 1mm, and the cutting is started from the lower part (the 1mm unilateral allowance is relative to the chord length of 2498.5 mm), the chord length after cutting is 2500.5mm and 2503.5mm, namely the target chord length when the primary fine cutting is 2502mm; and in the second fine cutting, the chord length is 0.3mm on each of the left side and the right side, and the lower part starts to cut, so that the chord length after cutting is 2499.1mm and 2502.1mm, namely the target chord length in the second fine cutting is 2500.6mm, and finally the surface roughness is improved by a single-side 0.3mm machine tool quick optical cutter, so that 2498.5mm and 2501.5mm are obtained, namely the target chord length in the optical cutter cutting is 2500mm. In the fine cutting method, the deviation value of the chord lengths of the upper part and the lower part is basically kept unchanged by 3mm after each cutting.
In the first fine cutting process, the single edges of the process allowance on the two lateral sides are reserved to be 1mm; and then cutting the process allowance of the two sides of the wall plate gradually until the unilateral process allowance is 0.3mm. The chord length of the upper part of the wall plate is the sum of the target chord length corresponding to the final wall plate and half of the deviation value d after the fine cutting, and the chord length of the lower part of the wall plate is the difference of the target chord length corresponding to the final wall plate and half of the deviation value d; for example, when the deviation of the chord lengths of the upper and lower portions of the rough cut wallboard is 1mm, the chord length of the upper portion after the first cut is the target chord length corresponding to the final wallboard plus 0.5mm, and the chord length of the lower portion is the target chord length corresponding to the final wallboard minus 0.5mm.
S5, milling the lower end face: and (5) after finishing the finish cutting of the two sides of the wallboard, milling the end face of the lower part. Firstly, rough milling is carried out on the lower end face, then finish milling is carried out on the lower end face by a light knife, the thickness of the end face meets the target requirement, and finally, the planeness of the lower end face is measured by a dial indicator.
S6, precision detection: and manually cutting off the residual process structures on the two lateral sides of the wallboard, measuring the thickness of the lower end surface of the wallboard by adopting an ultrasonic thickness gauge, and vertically lifting the wallboard to perform internal surface scanning measurement accuracy.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The method for precisely milling the process allowance of the complex grid reinforcement member is characterized in that a device for precisely milling the process allowance of the complex grid reinforcement member is adopted to cut the process allowance of the grid reinforcement member, and the device comprises a frame structure, a positioning structure, a supporting structure and a clamping structure; the frame structure comprises a bottom plate (1), a plurality of transverse clamping plates (2) and a plurality of longitudinal clamping plates (3) are arranged on the bottom plate (1) in parallel along the transverse direction and the longitudinal direction, and the top surface of the frame structure is an arc-shaped supporting surface matched with the arc-shaped surface of a complex grid reinforcement member (A) to be processed; the positioning structure comprises a circumferential positioning adjusting mechanism (4) which is respectively positioned at two lateral sides of the frame structure, an axial positioning adjusting mechanism (5) which is positioned at one longitudinal end of the frame structure, and a positioning plate (6) which is positioned at the other longitudinal end of the frame structure; the supporting structure comprises supporting plates (7) arranged on the periphery of the top of the frame structure and a downward sunken interference avoidance platform (8) arranged in the center of the arc-shaped supporting surface, and a plurality of adjustable bolts (9) are arranged on the two supporting plates (7) positioned on the two lateral sides of the frame structure; the clamping structure comprises a plurality of clamping assemblies (10) which are respectively arranged at two lateral sides of the frame structure, and the clamping assemblies (10) and the adjustable bolts (9) are arranged in a staggered manner; the two longitudinal ends of the frame structure are respectively provided with a first supporting plate (7.1), the inner sides of the first supporting plates close to one end of the axial positioning adjusting mechanism (5) are provided with second supporting plates (7.2) at intervals in parallel, and two third supporting plates (7.3) are connected between the second supporting plates and the first supporting plates close to one end of the positioning plate; cutter yielding grooves (7 a) are respectively formed in the two ends of the first supporting plates, the two ends of the second supporting plates and the two ends of the top of each transverse clamping plate, and the cutter yielding grooves (7 a) are positioned on the outer sides of the two third supporting plates; the method comprises the following steps:
s1, positioning a component: firstly, hanging a complex grid reinforcement member (A) to be processed on a milling device, enabling one end of the member in the length direction to be attached to a positioning plate (6) through an axial positioning adjusting mechanism (5), and enabling the centers of the members to be symmetrical through circumferential positioning adjusting mechanisms (4) on two lateral sides of the adjusting device;
s2, fixing a component: firstly, a metal block is arranged between a third supporting plate (7.3) and the inner profile of the component, or an adjustable bolt (9) on the third supporting plate (7.3) is adjusted so that the bolt is propped against the inner profile of the component; then, clamping assemblies (10) at two lateral sides of the device are adopted to fix the components; after the fixation is completed, measuring the top Z coordinates of a central rib (A1) and at least two lateral ribs (A2) which are transversely and symmetrically arranged on the component by adopting a machine tool, and if the deviation value of the top Z coordinates of the two lateral ribs which are transversely and symmetrically arranged is within 0.5mm, indicating that the component is well positioned after the clamping and fixation; dismantling the locating plate (6) and measuring the initial flatness of the side surface of the component by adopting a machine tool;
s3, rough cutting of the component: firstly, drawing lines on a final cutting line of a component by adopting a machine tool so as to prevent over-cutting; then rough cutting is carried out on the component, and a chord length process allowance of 5-10 mm is reserved on a single side during rough cutting so as to prevent serious deformation of the component caused by residual stress release; meanwhile, in order to ensure that the member still has enough rigidity in the cutting process, a plurality of process structures (11) are reserved on the two lateral sides of the member; after rough cutting is finished, the clamping assembly (10) is firstly removed, then a machine tool is adopted to measure the chord lengths of the two end parts of the component in the length direction, the component is lifted up to be vertical and in a free state, the chord lengths of the upper part and the lower part of the component are measured, and the chord lengths are respectively compared with the chord lengths of the two end parts measured on the machine tool;
s4, precisely cutting the component: repeating the step S1 and the step S2 to position and fix the component roughly cut in the step S3 again; carrying out multiple fine cutting on the component by adopting an average chord length method, gradually reducing the process allowance at the two lateral sides of the component until the unilateral process allowance is 0.2-0.5 mm, and finally carrying out a finishing cutter treatment to reduce the surface roughness of the part;
s5, milling the lower end face: milling the lower end face of the component after finishing finish cutting of the two lateral sides of the component;
s6, precision detection: and manually cutting off the residual process structures (11) on the two lateral sides of the component, measuring the thickness of the lower end surface of the component by adopting an ultrasonic thickness gauge, and carrying out internal surface scanning measurement accuracy after the component is vertically lifted.
2. The method according to claim 1, characterized in that the bottom plate (1), the transverse clamping plate (2) and the longitudinal clamping plate (3) are provided with a plurality of lightening holes, and the holes provided on the bottom plate avoid the transverse clamping plate (2) and the longitudinal clamping plate (3).
3. The method according to claim 1, characterized in that 4-6 adjustable bolts (9) are arranged on each third support plate at intervals; the width of the supporting plate is 70-100 mm.
4. The method according to claim 1, characterized in that the interference avoidance platform (8) is a platform cutting down from the centre point of the arc-shaped supporting surface to a depth of 10-20 mm.
5. Method according to claim 1, characterized in that in step S1, after the positioning is completed, the central rib (A1) of the component is axially measured with a machine tool to see if it is on a straight line, otherwise the component is slightly adjusted with a circumferential positioning adjustment mechanism (4) until the requirements are met.
6. The method according to claim 1, wherein in the step S2, in order to prevent the member from tilting to one side during the clamping and fixing process, symmetrical positions on both lateral sides of the member are simultaneously clamped, and when the member is clamped and fixed, a dial indicator is placed at the clamped position, and deformation of the dial indicator is controlled within 0.5mm.
7. The method according to claim 1, wherein in the step S4, a process allowance of 0.8-1.5 mm is reserved on each of two lateral sides of the component during the first fine cutting, and chord lengths of the upper and lower parts of the component are measured on a machine tool after cutting; and then carrying out fine cutting on the two lateral sides of the component by 0.6-1 mm of process allowance each time until the single-side process allowance is 0.2-0.5 mm.
8. The method of claim 7 wherein the upper and lower chord deviations of the member after each cut are d, and wherein after finishing the finish cut the chord length of the upper portion of the member is the sum of half the final target chord length plus the deviation d and the chord length of the lower portion of the member is the difference of half the final target chord length minus the deviation d.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310742119.5A CN116689843B (en) | 2023-06-21 | 2023-06-21 | Device and method for precisely milling process allowance of complex grid reinforcement member |
| GB2401723.8A GB2625455A (en) | 2023-06-21 | 2024-02-08 | Device and method for milling of complex grid-type ribbed member by precise machining allowance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310742119.5A CN116689843B (en) | 2023-06-21 | 2023-06-21 | Device and method for precisely milling process allowance of complex grid reinforcement member |
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| CN116689843A CN116689843A (en) | 2023-09-05 |
| CN116689843B true CN116689843B (en) | 2023-12-29 |
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| GB (1) | GB2625455A (en) |
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| CN115771003A (en) * | 2022-10-31 | 2023-03-10 | 天津航天长征火箭制造有限公司 | Ultrahigh-rib thin-skin variable external grid structure wallboard bending forming method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009041501B3 (en) * | 2009-09-14 | 2011-09-01 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for producing an optical arrangement with at least two optical functional surfaces, optical device and apparatus for carrying out the method |
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2023
- 2023-06-21 CN CN202310742119.5A patent/CN116689843B/en active Active
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| JP2018122401A (en) * | 2017-02-01 | 2018-08-09 | 三菱電機株式会社 | Processing device and processing method |
| CN108580985A (en) * | 2018-05-02 | 2018-09-28 | 中南大学 | A kind of milling method of large aluminum alloy melon lobed component |
| CN108580986A (en) * | 2018-05-02 | 2018-09-28 | 中南大学 | A kind of type face accuracy detection of large aluminum alloy bent member and milling method |
| CN208230930U (en) * | 2018-05-30 | 2018-12-14 | 中南大学 | The milling clamping tooling of large complicated carved component |
| WO2022252342A1 (en) * | 2021-06-04 | 2022-12-08 | 南京涵铭置智能科技有限公司 | Cutting machine capable of accurate positioning and cutting method therefor |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN116689843A (en) | 2023-09-05 |
| GB202401723D0 (en) | 2024-03-27 |
| GB2625455A (en) | 2024-06-19 |
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