CN112936768B

CN112936768B - Precision machining forming die for high-precision miniature power transmission ring process bushing

Info

Publication number: CN112936768B
Application number: CN202110167195.9A
Authority: CN
Inventors: 郭兰生; 任平; 舒燕
Original assignee: Shaanxi Baocheng Aviation Instrument Co Ltd
Current assignee: Speed Precision Tech Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2022-05-20
Anticipated expiration: 2041-02-07
Also published as: CN112936768A

Abstract

The precise processing forming die for the high-precision miniature power transmission ring process bushing is characterized in that a fixing mode of a core forming part of the die is innovatively designed, so that a combined core fixing mode adopts cylindrical positioning pins for positioning, a positioning pressing block is fixed by a screw I, and the positioning pressing block presses and fixes a combined core; and the front side and the rear side of the female die are positioned through the step structures on the two sides of the upper end surface of the fixing plate, the left side and the right side of the female die are positioned through the positioning pressing blocks, so that the female die is positioned all around effectively, the core forming part of the die is positioned, the fixing part is reliable, the assembling precision and the strength of the die are improved, the service life of the die is prolonged, the injection molding of an injection molding pouring system is convenient to adjust, the cooling temperature gradient and the flow direction parameter of injection molding plastic are avoided, the randomness of a pouring gate position is avoided being large, the key size of a part is caused to be out of tolerance, the size is unstable, the warping degree of injection molding of a plastic part is reduced, and the qualification rate of the injection molding assembly process bushing is improved.

Description

Precision machining forming die for high-precision miniature power transmission ring process bushing

Technical Field

The invention belongs to the technical field of dies, and particularly relates to a precision machining forming die for a high-precision miniature power transmission ring process bushing.

Background

The miniature precision power transmission accessory is a core power transmission component of certain equipment, the assembly and the machining forming of the miniature precision power transmission accessory are realized by assembling a process bushing, the structure of the process bushing is basically similar to that shown in figures 5 and 6, and the process bushing is only similar to that shown in figures 7 and 8, wherein the number of positioning rings is different, the number of positioning grooves is more, and the warping deformation is larger. In actual production, the technology of 50 years is adopted all the time, the forming structure of a related traditional die is shown in fig. 9 and 10, the original die forming part has large warping deformation all the time, part of key dimensions can not meet the product design requirements, the product design is required to change drawings or be used in an out-of-tolerance mode, and the subsequent assembly and processing qualified rate is difficult to improve.

The traditional mold design is introduced and designed according to various textbooks and professional reference data, the main forming core fixing mode is cylindrical pin positioning, screw fixing is achieved, the size of the screw is small, the strength is low, fixing is prone to failure, the female die is positioned in the front and back mode, the left and right sides of the female die are in a free state, the randomness of the pouring gate position is large, critical size of a part is caused to be out of tolerance, and the size is unstable. There is therefore a need for improvements.

Disclosure of Invention

The technical problems solved by the invention are as follows: the invention provides a precision machining forming die for a high-precision miniature power transmission ring process bushing, which has the advantages that the core forming part of the die is reliably positioned and fixed by innovatively designing the fixing mode of the core forming part of the die, the assembling precision and the strength of the die are improved, the service life of the die is prolonged, injection molding, cooling temperature gradient and injection molding plastic flow direction parameters of an injection molding and pouring system are conveniently adjusted, the problems of over-tolerance of key size of a part and unstable size caused by high randomness of a pouring gate position are avoided, the injection molding deformation warping degree of a plastic part is reduced, and the qualification rate of the injection molding and assembling process bushing is improved.

The technical scheme adopted by the invention is as follows: the precise machining forming die comprises a base plate, wherein a fixed plate is fixedly arranged at the upper part of the base plate, an ejector is arranged at the center inside the fixed plate, a combined mold core is arranged at the centers of the ejector and the upper part of the fixed plate, the combined mold core and the fixed plate are positioned through a cylindrical positioning pin, a female die is arranged at the upper part of the fixed plate, the front side and the rear side of the female die are positioned through step structures at two sides of the upper end surface of the fixed plate, and a forming cavity for forming the miniature power transmission ring process bushing is formed between a concave cavity at the lower part of the female die and the combined mold core; the fixed plate upper end face both sides all are equipped with the location compact heap, and screw I is direct with location compact heap and fixed plate fixed connection, the location compact heap just fixes a position the die left and right sides when will make up fixed the compressing tightly of core both ends.

The combined mold core comprises a mold core bolt, a mold core limiting section is arranged at the left end of the mold core bolt, a mold core lamination mounting section is arranged at the right end of the mold core bolt, mold core combined laminations combined by laminations with different interval diameters and thicknesses are mounted on the mold core lamination mounting section as required, a mold core nut is screwed at the right end of the mold core lamination mounting section through a threaded structure, and the mold core combined laminations are tightly pressed and fixed on the mold core bolt through the mold core nut.

The technical scheme is further limited, a partition plate is arranged at the contact position of the combined mold core and the upper port of the ejector, and the partition plate is used for plugging the end face of the formed saddle-shaped part.

According to the technical scheme, the positioning pin hole I is formed in the core limiting section at the left end of the combined core, the positioning pin hole II is also formed in the corresponding position of the fixing plate, and the cylindrical positioning pin penetrates through the positioning pin hole I and the positioning pin hole II to position the combined core and the fixing plate.

In the technical scheme, the lower part of the ejector is provided with a square shoulder structure, the shoulder structure moves in the moving height space of the fixing plate, and a return spring is arranged between the shoulder structure and the corresponding surface of the inner cavity of the fixing plate.

The technical scheme is further limited, and the fixing plate is fixedly connected with the base plate through a screw II.

Compared with the prior art, the invention has the advantages that:

1. the scheme innovatively designs a fixing mode of a core forming part of the mold, so that a fixing mode of the combined mold core adopts a cylindrical positioning pin for positioning, a screw I fixes a positioning pressing block, the positioning pressing block presses and fixes the combined mold core, the front side and the rear side of the female die are positioned through the step structures on the two sides of the upper end surface of the fixing plate, the left side and the right side of the female die are positioned through the positioning and pressing blocks, so that the female die can be positioned effectively in all directions, thereby ensuring the reliable positioning and fixing of the core forming part of the mould, improving the assembly precision and the strength of the mould, prolonging the service life of the mould, facilitating the adjustment of injection molding and cooling temperature gradient of an injection molding and pouring system and flow direction parameters of injection molding plastics, avoiding the over-tolerance of key sizes of parts due to large randomness of the position of a pouring gate, the size is unstable, the warping degree of injection molding deformation of a plastic part is reduced, and the qualification rate of the bushing in the injection molding assembly process is improved;

2. the test mould of this scheme innovative design is through continuous several years many times progressively analysis, exploratory innovative improvement mould design, and the part of similar structure, different products of continuous twice is experimental, is tried the mould, reaches product design requirement, verifies that the mould design has stability and sustainability, and main, key dimension all reaches the requirement that the product designed the drawing.

Drawings

FIG. 1 is a front view of the structure of the mold of the present invention;

FIG. 2 is a left side view of the structure of the inventive die;

FIG. 3 is a top view of the structure of the inventive die;

FIG. 4 is a schematic view of the construction of the composite core of the present invention;

fig. 5 is a front view of a product micro power transmission ring process liner;

fig. 6 is a view of the product micro power transmission ring process liner of fig. 5 from direction a-a;

fig. 7 is a perspective view of the deformed process liner of the product micro power transmission ring;

fig. 8 is a front view of a product micro power transmission ring process liner after deformation;

FIG. 9 is a front view of a prior art mold structure;

fig. 10 is a left side view of a prior art mold structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements" does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Referring to fig. 1-4, embodiments of the present invention are described in detail.

A precision finishing forming die for miniature transmission of electricity ring technology bush of high accuracy, as shown in fig. 1, 2 and 3, including backing plate 10, the fixed plate 5 that is equipped with in backing plate 10 upper portion, fixed plate 5 is the main part of each spare part installation of mould, fixed, location, pass through screw II 11 fixed connection between fixed plate 5 and the backing plate 10, make the mould form wholly.

An ejector 9 is arranged at the center inside the fixed plate 5, the ejector 9 is used for ejecting a formed part, a square shoulder structure is arranged at the lower part of the ejector 9, the shoulder structure moves in the moving height space of the fixed plate 5, a return spring 8 is arranged between the shoulder structure and the corresponding surface of the inner cavity of the fixed plate 5, and the return spring 8 enables the ejector 9 to return to the initial position.

The combined core 1 is arranged at the centers of the upper parts of the ejector 9 and the fixing plate 5, specifically, the combined core 1 comprises a core bolt 12, a core limiting section 16 is arranged at the left end of the core bolt 12, a core lamination mounting section 17 is arranged at the right end of the core bolt 12, core combined laminations 13 combined by laminations with different interval diameters and thicknesses are mounted on the core lamination mounting section 17 according to needs, a core nut 14 is screwed at the right end of the core lamination mounting section 17 through a thread structure, and the core nut 14 tightly presses and fixes the core combined laminations 13 on the core bolt 12. The structure controls the forming size of the core combined lamination 13 by adjusting the core bolt 12 and the core nut 14, and controls the interval of the core combined lamination 13, as shown in fig. 4.

The combined mold core 1 and the fixing plate 5 are positioned through the cylindrical positioning pin 2, a positioning pin hole I18 is formed in a mold core limiting section 16 at the left end of the combined mold core 1, a positioning pin hole II 19 is also formed in the corresponding position of the fixing plate 5, and the cylindrical positioning pin 2 penetrates through the positioning pin hole I18 and the positioning pin hole II 19 to position the combined mold core 1 and the fixing plate 5.

And a partition plate 7 is arranged at the contact position of the combined core 1 and the upper port of the ejector 9, and the partition plate 7 is used for plugging the end surface of the formed saddle-shaped part.

The upper portion of the fixing plate 5 is provided with a female die 6, the front side and the rear side of the female die 6 are positioned through step structures on two sides of the upper end face of the fixing plate 5, and a forming cavity 15 for forming the miniature power transmission ring process bushing is formed between a concave cavity on the lower portion of the female die 6 and the combined mold core 1. The fixed plate 5 up end both sides all are equipped with location compact heap 4, and screw I3 is direct with location compact heap 4 and fixed plate 5 fixed connection, location compact heap 4 just fixes a position the die 6 left and right sides when will make up 1 both ends fixed compression of core.

In the embodiment, the fixing mode of the core forming part of the die is innovatively designed, so that the fixing mode of the combined die core 1 adopts the positioning of the cylindrical positioning pin 2, the screw I3 fixes the positioning pressing block 4, the positioning pressing block 4 presses and fixes the combined die core 1, the front side and the rear side of the female die 6 are positioned through the step structures on the two sides of the upper end surface of the fixing plate, the left side and the right side of the female die 6 are positioned through the positioning and pressing blocks 4, so that the periphery of the female die 6 is effectively positioned in an all-around manner, the positioning and fixing part of the core forming part of the die is reliable, the assembly precision and the strength of the die are improved, the service life of the die is prolonged, the injection molding, cooling temperature gradient and injection molding plastic flow direction parameters of an injection molding pouring system are convenient to adjust, the over-tolerance of the key size of a part due to the large randomness of a pouring gate position is avoided, and the size is unstable, the warping degree of injection molding deformation of the plastic part is reduced, and the qualification rate of the injection molding assembly process bushing is improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A precision finishing forming die for miniature transmission ring technology bush of high accuracy, including backing plate (10), fixed plate (5) that are equipped with in backing plate (10) upper portion, fixed plate (5) inside center is equipped with ejector (9), its characterized in that: a combined mold core (1) is arranged in the centers of the upper parts of the ejector (9) and the fixed plate (5), the combined mold core (1) and the fixed plate (5) are positioned through a cylindrical positioning pin (2), a female mold (6) is arranged on the upper part of the fixed plate (5), the front side and the rear side of the female mold (6) are positioned through step structures on two sides of the upper end surface of the fixed plate (5), and a molding cavity (15) for molding the miniature power transmission ring process bushing is formed between a concave cavity on the lower part of the female mold (6) and the combined mold core (1); positioning compression blocks (4) are arranged on two sides of the upper end face of the fixing plate (5), the positioning compression blocks (4) are directly and fixedly connected with the fixing plate (5) through screws I (3), and the positioning compression blocks (4) are used for positioning the left side and the right side of the female die (6) while fixing and compressing two ends of the combined mold core (1);

the combined mold core (1) comprises a mold core bolt (12), a mold core limiting section (16) is arranged at the left end of the mold core bolt (12), a mold core lamination mounting section (17) is arranged at the right end of the mold core bolt (12), mold core combined laminations (13) combined by laminations with different interval diameters and thicknesses are mounted on the mold core lamination mounting section (17) according to needs, a mold core nut (14) is screwed at the right end of the mold core lamination mounting section (17) through a thread structure, and the mold core nut (14) tightly presses and fixes the mold core combined laminations (13) on the mold core bolt (12);

the combined core (1) is characterized in that a locating pin hole I (18) is formed in a core limiting section (16) at the left end of the combined core (1), a locating pin hole II (19) is also formed in a corresponding position on the fixing plate (5), and the cylindrical locating pin (2) penetrates through the locating pin hole I (18) and the locating pin hole II (19) to locate the combined core (1) and the fixing plate (5).

2. The precision machining forming die for the high-precision miniature power transmission ring process bushing according to claim 1, wherein: a partition plate (7) is arranged at the contact position of the combined mold core (1) and the upper end opening of the ejector (9), and the partition plate (7) is used for plugging the end face of the formed saddle-shaped part.

3. The precision machining mold for the high-precision miniature power transmission ring process bushing according to claim 1, wherein: the lower part of the ejector (9) is provided with a square shoulder structure, the shoulder structure moves in the moving height space of the fixed plate (5), and a return spring (8) is arranged between the shoulder structure and the corresponding surface of the inner cavity of the fixed plate (5).

4. The precision machining mold for the high-precision miniature power transmission ring process bushing according to claim 1, wherein: the fixing plate (5) is fixedly connected with the backing plate (10) through a screw II (11).