CN107336059B

CN107336059B - Milling head for machining polygonal parts

Info

Publication number: CN107336059B
Application number: CN201710778214.5A
Authority: CN
Inventors: 李金良
Original assignee: Langkuai Intelligent Technology Hangzhou Co ltd
Current assignee: Langkuai Intelligent Technology Hangzhou Co ltd
Priority date: 2017-09-01
Filing date: 2017-09-01
Publication date: 2023-05-23
Anticipated expiration: 2037-09-01
Also published as: CN107336059A

Abstract

The invention discloses a milling head for processing polygonal parts, which comprises a cylindrical fixing seat, a tool holder rotatably arranged in the fixing seat and two groups of tool assemblies, wherein the tool holder and the fixing seat are coaxially arranged, the tool assemblies comprise tool shafts rotatably arranged on the tool holder and tools arranged at the outer ends of the tool shafts and used for processing workpieces, the two tool shafts are uniformly arranged on the circumference taking the central line of the fixing seat as the center of a circle, the tool holder and the two tool shafts are driven by the same transmission shaft, and the transmission shaft is rotatably supported on the fixing seat. The two cutters of the milling head adopt the same power source to process completely and synchronously, thereby ensuring the position accuracy of the opposite sides of the polygon.

Description

Milling head for machining polygonal parts

Technical Field

The invention relates to the field of processing polygonal parts, in particular to a milling head for processing polygonal parts.

Background

The polygonal parts are commonly found in various industries, such as opposite planes of the end part of a valve core, the current machining mode is to use two parallel saw blades for multiple machining, the production efficiency is low, and the machining is performed by different power heads or different stations, the position accuracy is poor, the symmetry degree is poor, the machining time is long, the working procedure is complex, for example, the distance between the opposite planes is 10mm, the six sides with the depth of 5mm are required to be machined in three times, the machining time is about 8s each time, and the labor cost is further increased.

Disclosure of Invention

The main purpose of the invention is to provide a milling head for processing polygonal parts, wherein two cutters of the milling head are powered by the same power source, and the processing precision is high.

In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a milling head for processing polygon part, its characterized in that includes cylindric fixing base, rotationally sets up blade holder and two sets of cutter components in the fixing base, the blade holder sets up with the fixing base is coaxial, the cutter component includes the rotatable cutter axle that sets up on the blade holder and sets up the cutter that is used for carrying out processing to the work piece at the cutter axle outer end, two the cutter axle evenly sets up on the circumference that uses the central line of fixing base as the centre of a circle, blade holder and two the cutter axle is driven by same transmission shaft, the transmission shaft rotationally supports on the fixing base.

Preferably, the tool comprises a tool body and a plurality of blades located on the circumferential surface of the tool body, the cutting edges of the blades being arranged on the side of the blades facing the axis of rotation of the tool holder, the blades of the two sets of tool assemblies being in one-to-one correspondence and the corresponding blades being mutually symmetrical with respect to the axis of rotation of the tool holder.

Preferably, the automatic cutting tool further comprises a rotation driving gear and a revolution driving gear, wherein the rotation driving gear is non-rotatably fixed on the transmission shaft, the revolution driving gear is rotatably sleeved on the transmission shaft and is non-rotatably connected with the tool holder, and a rotation driven gear meshed with the automatic driving gear at the same time is arranged at the inner end of each tool shaft.

Preferably, an annular connecting cover plate is fixed at the lower end of the tool holder, and the revolution driving gear comprises a sleeve part and a gear part coaxially arranged with the sleeve part, wherein the sleeve part is fixed on the inner edge of the connecting cover plate in a non-rotatable manner.

Preferably, the auxiliary transmission device further comprises an auxiliary shaft rotatably arranged on the fixed seat and gears arranged at the upper end and the lower end of the auxiliary shaft, the auxiliary shaft is parallel to the transmission shaft, the gears at the upper end of the auxiliary shaft are meshed with the revolution driving gear, and the gears at the lower end of the auxiliary shaft are meshed with the auxiliary transmission gears arranged on the transmission shaft.

Preferably, the nominal diameters of the gear at the upper end of the auxiliary shaft and the driven gear are the same, the nominal diameters of the revolution driving gear and the self-transmission driving gear are the same, and the nominal diameters of the auxiliary transmission gear and the gear at the lower end of the auxiliary shaft are the same.

Preferably, the auxiliary transmission has two sets, the two sets of auxiliary transmissions being symmetrically arranged with respect to the axis of the transmission shaft.

Preferably, the part of the transmission shaft extending into the tool holder is matched with the tool holder through a bearing.

Preferably, the drive shaft is rotatably connected to the holder via a needle bearing.

Compared with the prior art, the invention has the following beneficial effects:

the two cutters of the milling head are driven simultaneously by the same power source, so that the movements of the two cutters are completely synchronous, the machining precision consistency of opposite sides of the polygon can be ensured, and particularly the position precision of the opposite sides of the polygon is ensured; and when the cutter rotates relative to the cutter holder, the cutter holder also rotates relative to the fixed seat, so that the rotation and revolution of the cutter are simultaneously carried out, a plurality of edges can be ensured to be machined, the position of the cutter is not required to be changed or the station is not required to be replaced, the time is saved, and the production efficiency is improved.

Drawings

FIG. 1 is a perspective view of a preferred embodiment according to the present invention

FIG. 2 is a top view of a preferred embodiment according to the present invention

FIG. 3 is a view A-A of a preferred embodiment of the present invention

Detailed Description

The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.

A milling head for machining polygonal parts, shown in fig. 1-3, comprises a cylindrical holder 1, a holder 2 rotatably fixed in the holder 1, and two sets of tool assemblies 3 rotatably supported on the holder 2, the holder 1 and the holder 2 being coaxially arranged, the axis of rotation of the tool assemblies 3 being parallel to the axis of the holder 1, and the two sets of tool assemblies 3 being uniformly arranged in the same circumferential direction.

The fixed seat 1 and the tool holder 2 are connected in a relative rotation manner through two tool holder bearings 21 which are abutted against each other, specifically, an annular first step 11 is arranged in the fixed seat 1, the lower end face of the outer ring of the tool holder bearing 21 which is positioned on the inner side abuts against the first step 11, one end of the fixed seat 1, which is close to the tool holder 2, is provided with a tool holder bearing outer end cover 22, and the tool holder bearing outer end cover 22 is matched with the end part of the tool holder 2 and abuts against the upper end face of the outer ring of the tool holder bearing 21 which is positioned on the outer side. The outer end of the holder 2 abuts against the upper end face of the inner ring of the holder bearing 21 located on the outer side, the lower end face of the inner ring of the holder bearing 21 located on the inner side abuts against the holder bearing inner end cap 24, and the holder bearing inner end cap 24 is fixed to the holder 2 by a screw, so that the holder bearing inner end cap 24 rotates together with the holder 2 when the holder 2 rotates relative to the holder 1. The blade seat bearing 21 is a ball bearing, which belongs to the prior art and will not be described in detail here.

The cutter assembly 3 comprises a cutter shaft 32 penetrating through the cutter holder 2, a cutter 31 fixed at the outer end of the cutter shaft 32 and a rotation driven gear 33 fixed at the inner end of the cutter shaft 32, wherein the cutter shaft 32 is in relative rotation connection with the cutter holder 2 through a plurality of coaxially arranged cutter bearings 34. Specifically, the lower end face of the outer ring of the tool bearing 34 abuts against the second step 25 of the holder 2, the upper end face of the outer ring of the tool bearing 34 abuts against a tool bearing cover 35, and the tool bearing cover 35 is fixed to the holder 2 coaxially with the tool shaft 32. The upper end face of the inner ring of the tool bearing 34 abuts against a step of the tool shaft 32. The lower end face of the rotation driven gear 33 abuts against an end cover, the upper end face abuts against the lower end face of the inner ring of the cutter bearing 34 or directly abuts against a corresponding step of the cutter shaft 32 through a sleeve, and the automatic driven gear 33 is not in contact with the cutter holder 2, so that when the rotation driven gear 33 rotates, the cutter 31 can be driven to rotate.

The cutter 31 includes a disc-shaped cutter body 311 and a plurality of blades 312 located on the circumferential surface of the cutter body 311, the plurality of blades 312 being uniformly disposed on the circumferential surface of the cutter body 311, and the cutting edges of the blades 312 being disposed on the outer end surfaces of the blades 312. The shortest distance between the edges of the blades 312 of the two sets of cutter assemblies 3 is set equal to the distance of the opposite sides of the polygonal part to be machined. During machining, the blades 312 on the two groups of cutter assemblies 3 are in one-to-one correspondence, and the corresponding blades 312 are symmetrical to each other relative to the rotation axis of the cutter holder 2 in the rotating process, so that the same milling amount can be ensured to be performed on the workpiece by the blades 312 at the same time.

The milling head further comprises a transmission shaft 4 rotatably arranged on the holder 1, said transmission shaft 4 being located on the axis of the holder 1. The end of the transmission shaft 4, which is close to the tool apron 2, is provided with a rotation driving gear 41, and the rotation driving gear 41 is simultaneously meshed with rotation driven gears 33 of the two groups of tool assemblies, so that the tools 31 of the two groups of tool assemblies 3 can be simultaneously driven to rotate. Specifically, a needle bearing 43 is disposed between the transmission shaft 4 and the fixing base 1, and the rotation of the transmission shaft 4 can be ensured through the needle bearing 43, and the stability of the transmission shaft 4 during rotation can be ensured.

An annular connecting cover plate 42 is arranged on the lower end face of the tool apron 2, a revolution driving gear 44 is matched in the middle of the connecting cover plate 42, the revolution driving gear 44 comprises a sleeve part and a gear part, the sleeve part is in key connection with the connecting cover plate 42, and the gear part is positioned below the connecting cover plate 42. The drive shaft 4 passes through the revolution driving gear 44 and the drive shaft 4 is not in contact with the inner edge of the revolution driving gear 44. The fixing seat 1 is provided with a rotatable auxiliary shaft 5 with a transmission shaft 4 in parallel, and the auxiliary shaft 5 is matched with the fixing seat 1 by adopting a bearing. The upper and lower ends of the auxiliary shaft 5 are respectively provided with

gears

51 and 52, and the gear 51 at the upper end is engaged with the gear portion of the revolution driving gear 44. An auxiliary transmission gear 45 is also provided at the lower end of the transmission shaft 4, the auxiliary transmission gear 45 being meshed with a gear 52 provided at the lower end of the auxiliary shaft 5. Thus, when the transmission shaft 4 rotates, the gear 52 is driven to rotate by the auxiliary transmission gear 45, the gear 52 drives the auxiliary shaft 5 to rotate, the auxiliary shaft 5 drives the gear 51 to rotate, the gear 51 drives the revolution driving gear 44 to rotate, and the revolution driving gear 44 drives the tool holder 2 to rotate through the connecting cover plate 42 so as to realize the revolution of the tool holder 2. During the rotation of the drive shaft 4, the rotation driving gear 41 rotates the cutter 21 via the driven gear 33 and the cutter shaft 32. Also, the auxiliary shaft 5 and the

gears

51 and 52 may be provided in two sets and symmetrically disposed with respect to the driving shaft 4 to increase the stability of the driving. The nominal diameters of the gear 51 and the driven gear 33 are the same, the nominal diameters of the revolution driving gear 44 and the rotation driving gear 41 are the same, and the nominal diameters of the auxiliary driving gear 45 and the gear 52 are the same, so that the automatic speed of the blade 312 is the same as the revolution speed, and the equilateral polygon can be processed. When each cutter member 3 has two blades 312 spaced 180 apart, a regular square configuration can be machined, and when each cutter member 3 has three blades 312 spaced 120 apart, a regular hexagonal configuration can be machined.

In order to reduce the shaking when the transmission shaft 4 rotates, a first bearing 43 is arranged at the top end of the transmission shaft 4, and the outer ring of the first bearing 43 is matched with the tool apron 2.

The lower end of the transmission shaft 4 is connected with a driving device (an electric main shaft), and the rotation of the transmission shaft 4 can be driven by the driving device. Specifically, a transmission end cover 6 is arranged at the lower end of the transmission shaft 4, the transmission end cover 6 is in spline connection with the transmission shaft 4, and an output shaft of the driving device is also in spline connection with the transmission end cover 6.

When machining a workpiece, the workpiece is placed between the two sets of tool assemblies 3, or the workpiece is placed on the common axis of the tool assemblies 3, so that a symmetrical polygon can be machined.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The milling head for machining polygonal parts is characterized by comprising a cylindrical fixing seat, a tool holder rotatably arranged in the fixing seat and two groups of tool assemblies, wherein the tool holder and the fixing seat are coaxially arranged, the tool assemblies comprise tool shafts rotatably arranged on the tool holder and tools arranged at the outer ends of the tool shafts and used for machining workpieces, the two tool shafts are uniformly arranged on the circumference taking the central line of the fixing seat as the center of a circle, the tool holder and the two tool shafts are driven by the same transmission shaft, and the transmission shaft is rotatably supported on the fixing seat;

the cutter comprises a cutter body and a plurality of blades positioned on the circumferential surface of the cutter body, the cutting edges of the blades are arranged on one side of the blades facing the rotation axis of the cutter holder, the blades of the two groups of cutter components are in one-to-one correspondence, and the corresponding blades are mutually symmetrical relative to the rotation axis of the cutter holder;

the milling head further comprises a rotation driving gear and a revolution driving gear, the rotation driving gear is fixed on the transmission shaft in a non-rotatable mode, the revolution driving gear is sleeved on the transmission shaft in a rotatable mode and is connected with the tool apron in a non-rotatable mode, and a rotation driven gear meshed with the automatic driving gear simultaneously is arranged at the inner end of each tool shaft.

2. A milling head for machining polygonal parts according to claim 1, characterized in that an annular connecting cover plate is fixed at the lower end of the tool holder, the revolution driving gear comprising a sleeve portion and a gear portion arranged coaxially with the sleeve portion, the sleeve portion being non-rotatably fixed to the inner edge of the connecting cover plate.

3. A milling head for machining polygonal parts according to claim 1, further comprising an auxiliary transmission device comprising an auxiliary shaft rotatably provided on the fixing base and gears provided at both upper and lower ends of the auxiliary shaft, the auxiliary shaft being parallel to the transmission shaft, the gears at the upper end of the auxiliary shaft being engaged with the revolution driving gear, the gears at the lower end of the auxiliary shaft being engaged with the auxiliary transmission gear provided on the transmission shaft.

4. A milling head for machining polygonal parts according to claim 3, characterized in that the nominal diameters of the gears at the upper end of the auxiliary shaft and the driven gear are the same, the nominal diameters of the revolution driving gear and the rotation driving gear are the same, and the nominal diameters of the gears at the lower end of the auxiliary driving gear and the auxiliary shaft are the same.

5. A milling head for machining polygonal parts according to claim 4, characterized in that the auxiliary drives have two sets, which are arranged symmetrically with respect to the axis of the drive shaft.

6. A milling head for machining polygonal parts according to claim 1, characterized in that the part of the drive shaft that protrudes into the holder is fitted with the holder by means of bearings.

7. A milling head for machining polygonal parts according to claim 1, characterized in that the drive shaft is rotatably connected to the holder by means of needle bearings.