CN110757188A

CN110757188A - Positioning fixture for numerical control drilling and milling machining of cycloid disc

Info

Publication number: CN110757188A
Application number: CN201911256923.2A
Authority: CN
Inventors: 张朝伟; 彭学云; 彭学明; 徐玉峰
Original assignee: KUNSHAN GUANGTENG INTELLIGENT MACHINERY CO Ltd; Kunshan Huaheng Welding Co Ltd
Current assignee: KUNSHAN GUANGTENG INTELLIGENT MACHINERY CO Ltd; Kunshan Huaheng Welding Co Ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-02-07

Abstract

The invention provides a positioning fixture for numerical control drilling and milling of a cycloid disc, which comprises: the fixture body can be used for supporting the cycloid disc and is provided with a positioning channel which is communicated up and down, and the positioning channel corresponds to at least three positioning holes in the cycloid disc; the positioning device comprises at least three positioning components which correspond to the at least three positioning holes one by one, each positioning component comprises a locking pin and an expansion sleeve sleeved on the locking pin, the locking pin is provided with a cone part accommodated in the positioning hole and a rod part connected to the lower part of the cone part and accommodated in a positioning channel, at least part of the expansion sleeve is positioned on the cone part, and the expansion sleeve is provided with a locking state which is radially expanded to lock the corresponding positioning hole and an unlocking state which is reset to unlock the positioning hole; the driving assembly is used for driving the locking pin to move up and down so as to switch the expansion sleeve between a locking state and an unlocking state; the positioning of the cycloid disc in the circumferential direction and the radial direction can be realized, one-time processing of tooth shapes, center holes and peripheral holes is facilitated, and the good coaxiality of the tooth shapes, the center holes and the peripheral holes can be guaranteed.

Description

Positioning fixture for numerical control drilling and milling machining of cycloid disc

Technical Field

The invention relates to the technical field of numerical control milling machine equipment, in particular to a positioning fixture for numerical control drilling and milling of a cycloid disc.

Background

The existing robot and logistics industry generally uses a high-precision speed reducer as a transmission device. Such as RV reducers, harmonic gear reducers, etc., as is well known. The cycloid disc serving as a secondary speed reducer of the RV speed reducer is one of core parts of the whole set of device, and due to the particularity of the shape of the cycloid disc, the processing method and the positioning and clamping mode of the cycloid disc parts are diversified.

In the prior art, when the cycloid disc is subjected to numerical control drilling and milling, due to the problem that the cycloid disc is difficult to position in the machining process, the tooth shapes, the central holes, the peripheral holes and the like of the cycloid disc need to be machined and formed in batches, so that the machining efficiency is low, the working hours are long, and the working procedures are extremely complicated; in addition, the problem of poor coaxiality among the machined cycloidal coil tooth shape, the central hole and the reference circle of the peripheral hole can also exist, and the precision and the performance of the speed reducer are seriously influenced.

In view of the above, there is a need to provide a new positioning fixture for the cycloid disc numerical control drilling and milling process to solve the above problems.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present invention provides a positioning fixture for the numerical control drilling and milling of a cycloid disc.

In order to achieve the above object, the present invention provides a positioning fixture for numerical control drilling and milling of a cycloid disc, comprising:

the upper surface of the fixture body can be used for supporting the cycloid disc and is provided with a positioning channel which vertically penetrates through the fixture body, and the positioning channel corresponds to at least three positioning holes in the cycloid disc;

the positioning device comprises at least three positioning components which correspond to the at least three positioning holes one by one, each positioning component comprises a locking pin and an expansion sleeve sleeved on the locking pin, the locking pin is provided with a cone part accommodated in the positioning hole and a rod part connected to the lower part of the cone part and accommodated in the positioning channel, at least part of the expansion sleeve is positioned on the cone part, and the expansion sleeve is provided with a locking state which is radially expanded to lock the corresponding positioning hole and an unlocking state which is reset to unlock the positioning hole; and

and the driving assembly is used for driving the locking pin, and in the process of driving the locking pin to move up and down, the expansion sleeve is switched between the locking state and the unlocking state.

As a further improved technical scheme of the invention, the cone part is provided with an outer surface which is contracted from top to bottom and approaches the central line of the locking pin, the expansion sleeve is provided with a limited surface, and the clamp body is provided with a limited surface;

in the process that the driving assembly drives the locking pin to move from top to bottom, the limiting surface abuts against the limited surface to stop the expansion sleeve from moving downwards, and the expansion sleeve is switched from the unlocking state to the locking state.

As a further improved technical scheme of the invention, the upper part of the positioning channel is provided with a step part forming the limiting surface, and the lower end of the expansion sleeve is accommodated in the positioning channel and is propped against the step part.

As a further improved technical solution of the present invention, the driving assembly includes:

the locking pins are connected with the transmission piece;

the driving piece drives the transmission piece to drive the locking pin to move from bottom to top during starting operation; and

the elastic piece drives the driving piece to move from bottom to top, the elastic piece is elastically deformed, and when the driving piece stops, the elastic piece acts on the driving piece to drive the locking pin to move from top to bottom.

As a further improved technical solution of the present invention, the driving member includes:

a cylinder body having an inner cavity and disposed below the clamp body in a relatively fixed manner; and the combination of (a) and (b),

a piston disposed in the inner chamber and reciprocating up and down between the cylinder and the chuck body;

the transmission piece is arranged between the piston and the clamp body, and the piston drives the transmission piece to move upwards when the driving piece starts operation.

As a further improved technical scheme of the invention, a hole structure which is concavely arranged upwards is formed on the lower surface of the clamp body, the piston is provided with a column structure matched with the hole structure in shape, and the column structure movably extends into the hole structure up and down.

As a further improved technical scheme of the invention, the hole structure vertically penetrates through the fixture body and is coaxial with the cycloid disc;

the positioning fixture further comprises a loading and unloading auxiliary part, and the lower end of the loading and unloading auxiliary part is connected to the column structure; the handling aid has an operable portion at an upper end thereof, the operable portion being exposed to an upper surface of the clamp body.

As a further improved technical scheme of the invention, the transmission piece is provided with a transmission rod connected with the locking pin and a boss positioned at the lower end of the transmission rod, the transmission piece is movably positioned below the clamp body up and down, and the boss and the clamp body are distributed at intervals;

the elastic piece is positioned between the clamp body and the boss;

when the driving piece drives the transmission piece to move upwards, the boss and the clamp body move relatively to enable the elastic piece to generate elastic deformation;

when the driving piece stops, the elastic piece provides driving force for driving the driving piece to drive the locking pin to move downwards.

As a further improved technical scheme of the invention, the transmission piece is correspondingly connected with at least three locking pins one by one;

the elastic piece is a pressure spring sleeved on the transmission rod.

As a further improved technical scheme of the invention, one of the fixture body and the transmission piece is provided with a guide pin which protrudes laterally, and the other is provided with a guide groove which extends along the vertical direction and is matched with the guide pin.

As a further improved technical scheme of the invention, the positioning channels correspond to at least three positioning assemblies one by one.

The invention has the beneficial effects that: through setting up and corresponding respectively with the at least three locating hole of cycloid dish locating component, and pass through drive assembly is right locating component's drive works as expand the cover in under the unblock state, can be right the cycloid dish is settled and is dismantled, works as expand the cover in under the locking state, it is right the cycloid dish carries out week upwards and radial ascending synchronous positioning, and then realizes the location and the clamp tightly to the cycloid dish, and then can realize the disposable processing preparation to the profile of tooth, centre bore, all around holes of cycloid dish to can guarantee to have fine axiality between the profile of tooth, the centre bore of processing back cycloid dish and all around hole place reference circle three.

Drawings

FIG. 1 is a perspective view of a preferred embodiment of a positioning fixture in engagement with a cycloid disc;

FIG. 2 is a block diagram of a fourth axis turret of a preferred embodiment;

FIG. 3 is a block diagram of the driving member, resilient member and guide pin of a preferred embodiment;

FIG. 4 is a block diagram of a clamp body of a preferred embodiment;

FIG. 5 is a block diagram of the locking pin, expansion sleeve and handling aid of a preferred embodiment;

FIG. 6 is a block diagram of a cycloid disc to which the positioning fixture of the preferred embodiment is adapted;

FIG. 7 is a sectional view of the engagement of the positioning fixture with the cycloid disc in accordance with a preferred embodiment;

fig. 8 is an enlarged view of a partial region in fig. 7.

Detailed Description

Referring to fig. 1 to 8, a positioning fixture of a preferred embodiment of the present invention is illustrated, and a specific application of the positioning fixture in the numerical control drilling and milling process of the cycloid disc is illustrated, including the fixation of the positioning fixture on the numerical control machine tool, and the cycloid disc 1 to which the positioning fixture is applied. The positioning jig according to a preferred embodiment of the present invention will be described with reference to the drawings.

The positioning fixture comprises a fixture body 3, at least three positioning assemblies and a driving assembly.

The fixture body 3 is fixedly assembled on a fourth shaft rotary table 2 of the numerical control machine tool, the upper surface 31 of the fixture body can be used for supporting the cycloid disc 1, the fixture body 3 is provided with a positioning channel 32 which vertically penetrates through the fixture body 3, the positioning channel 32 corresponds to at least three positioning holes 1a in the cycloid disc 1, and therefore at least an avoiding effect is achieved on a locking pin 6 in the later period, and the locking pin 6 penetrates through the fixture body 3 to be matched with the cycloid disc 1 and the driving assembly respectively.

Regarding the configuration of the positioning channel 32, in the preferred embodiment, it is provided as a substantially vertically extending cylindrical channel and is in a surface-fitting mating configuration with the later-described locking pin 6, so as to simultaneously perform the functions of avoiding and positioning the locking pin 6; in addition, regarding the number of positioning passages 32, in the present preferred embodiment, the number of positioning passages 32 is also set to four that are evenly distributed at intervals of 90 ° circumferentially so as to correspond one-to-one to the four positioning holes 1a, corresponding to the four positioning holes 1a evenly distributed at intervals of 90 ° circumferentially on the cycloid disc 1. Of course, in a modified embodiment, the positioning channels 32 may be provided in other configurations and numbers so as to satisfy the basic design principle of communicating at least three positioning holes 1a with the lower portion of the fixture body 3 (that is, the positioning channel 32 communicating a positioning hole 1a with the lower portion of the fixture body 3, i.e., the positioning channel 32 corresponding to the positioning hole 1 a), and the corresponding relationship between the positioning channel 32 and at least three positioning holes 1a may be one-to-one, one-to-many, etc.

At least three positioning assemblies correspond to at least three positioning holes 1a one-to-one, that is, the number of the positioning assemblies is at least three, and each positioning assembly corresponds to one positioning hole 1 a. For the four positioning holes 1a in the preferred embodiment, the number of the positioning components is set to 4, but in a modified embodiment, the number of the positioning components only needs to be three or more. In addition, in the preferred embodiment, the positioning components are also in a one-to-one correspondence relationship with the positioning channels 32, but when the configuration or the number of the positioning channels 32 is changed as described above, at least three positioning components can still be in a two-to-one, many-to-one, or the like correspondence with the positioning channels 32, so that the positioning channels 21 can avoid at least three positioning components as a basic principle.

Each of the positioning assemblies includes a locking pin 6 and an expansion sleeve 7.

The locking pin 6 is disposed in the positioning channel 32 and penetrates the fixture body 3 vertically. Specifically, the locking pin 6 has a taper 601 and a rod 602, the taper 601 constitutes an upper end portion of the locking pin 6, and when the cycloid disc 1 is placed on the clamp body 3, the taper 601 is accommodated in the positioning hole 1 a; the rod 602 is connected to the lower portion of the tapered portion 601 and is accommodated in the positioning channel 32, and the lower end of the rod 602 extends through the fixture body 3 to the lower portion of the fixture body 3 so as to be matched with the driving assembly (as will be described in detail later), wherein the positioning channel 32 is configured to perform a relief function on the rod 602, as described above, and preferably, at least a part of the surface of the positioning channel 32 and at least a part of the outer surface of the rod 602 are substantially in a cylindrical shape to perform a guiding and positioning function on the rod 602, as in this embodiment.

As can be seen from the foregoing, when the cycloid disc 1 is placed on the fixture body 3, the portion of the expansion sleeve 7 located on the tapered portion 601 is also received in the positioning hole 1 a.

The expansion sleeve 7 has a locked state and an unlocked state as shown in fig. 8. When the expansion sleeve 7 is in the locking state, the expansion sleeve 7 expands radially, and the outer surface of the expansion sleeve is tightly attached to the wall of the corresponding positioning hole 1a so as to lock the corresponding positioning hole 1 a; when the expansion sleeve 7 is in the unlocking state, the expansion sleeve 7 is radially retracted and restored from the radially expanded state, and the outer surface of the expansion sleeve leaves or just contacts the hole wall of the corresponding positioning hole 1a, so that the positioning hole 1a is unlocked. It can be understood that when the expansion sleeve 7 is matched with the positioning hole 1a in the locking state, the cycloid disc 1 is limited by the expansion sleeve 7 and cannot swing, and the cycloid disc 1 cannot rotate around the central axis thereof in combination with at least three positioning holes 1a being locked; when the expansion sleeve 7 unlocks the positioning hole 1a, the cycloid disc 1 is separated from the limitation, and the assembly and disassembly can be realized.

The driving assembly is used for driving the locking pin 6 to reciprocate up and down, as mentioned above, the lower end of the rod portion 602 of the locking pin 6 extends to the lower part of the clamp body 3, so that the locking pin is in contact fit with the driving assembly, and the driving assembly can drive the locking pin 6.

In the process that the driving assembly drives the locking pin 6 to move up and down, the expansion sleeve 7 is switched between the locking state and the unlocking state, and accordingly the locking and unlocking of the cycloid disc 1 are achieved correspondingly.

Based on the above description, the positioning fixture of the present invention can install and detach the cycloid disc 1 when the expansion sleeve 7 is in the unlocked state by providing the positioning assemblies corresponding to the at least three positioning holes 1a of the cycloid disc 1, respectively, and driving the positioning assemblies by the driving assemblies; of course, it can be understood that, when the cycloid disc 1 needs to be installed, the positioning assembly may pass through the corresponding positioning hole 1a and the corresponding positioning channel 32 after the cycloid disc 1 is placed on the fixture body 3, and be connected to the driving assembly, and at this time, after the positioning assembly is connected to the driving assembly, the expansion sleeve is in an unlocked state.

When the expansion sleeve 7 is in the locking state, the cycloid disc 1 is positioned in a circumferential and radial synchronous mode, so that the cycloid disc 1 is positioned and clamped, the tooth form, the central hole and the peripheral holes of the cycloid disc 1 can be machined and manufactured at one time, and good coaxiality among the tooth form, the central hole and the reference circle where the peripheral holes are located of the machined cycloid disc 1 can be guaranteed.

Further, the driving assembly may drive the locking pin 6 to reciprocate up and down.

In one embodiment, the tapered portion has an outer surface 61 that converges from top to bottom toward the center line of the locking pin, the outer surface 61 may be a slanted plane or a curved surface, and the tapered portion 601 preferably has an inverted tapered shape with a top being thicker and a bottom being thinner. In the process that the driving assembly drives the locking pin 6 to move from bottom to top, the expansion sleeve 7 is switched from the unlocking state to the locking state; in the process that the driving assembly drives the locking pin 6 to move from bottom to top, the expansion sleeve 7 is switched from the locking state to the unlocking state.

Specifically, in a preferred embodiment of the present invention, the expansion sleeve 7 has a limited surface 71, the clamp body 3 has a limited surface 321, and during the process that the locking pin 6 moves from top to bottom, the limited surface 321 abuts against the limited surface 71 to stop the downward movement of the expansion sleeve 7. Therefore, in the process that the driving assembly drives the locking pin 6 to move from top to bottom, the expansion sleeve 7 is abutted by the limiting surface 321 to stop moving, and the locking pin 6 moves downwards relative to the expansion sleeve 7, and simultaneously, the outer surface 61 of the conical part 601 radially outwards presses the expansion sleeve 7, so that the expansion sleeve 7 radially expands to be in the locking state; on the contrary, in the process that the driving assembly drives the locking pin 6 to move from bottom to top, the locking pin 6 moves upwards relative to the expansion sleeve 7 so that the outer surface 61 of the locking pin gradually separates from the expansion sleeve 7, and the expansion sleeve 7 is radially retracted and returns to the unlocking state.

Preferably, in the present embodiment, the upper portion of the positioning channel 32 has a stepped portion constituting the stopper surface 321, the stepped portion is configured based on an increase in the upper caliber of the positioning channel 32, and the lower end of the expansion sleeve 7 is accommodated in the positioning channel 32 and abuts against the stepped portion, that is, the lower end surface of the expansion sleeve 7 constitutes the surface 71 to be stopped. Like this, on the one hand can satisfy the stopping of the resistance of expanding sleeve 7 motion, on the other hand, through with the lower extreme of expanding sleeve 7 hold in location passageway 32, also can realize right the installation location of expanding sleeve 7 avoids expanding sleeve 7 to rock.

Further, the driving assembly comprises a driving member 4 and an elastic member 10.

In a preferred embodiment, the driving element 4 drives the locking pin 6 to move from bottom to top during the starting operation, that is, the driving force is used as the source power for changing the expansion sleeve 7 from the locking state to the unlocking state, and in the process, the elastic element 10 is elastically deformed; when the driving element 4 is stopped, the elastic element 10 drives the locking pin 6 to move from top to bottom in the process of at least partially restoring deformation, namely the deformation restoring force of the elastic element is used as a source power for changing the expansion sleeve 7 from the unlocking state to the locking state. Of course, in a modified embodiment, the driving direction of the driving member 4 and the driving direction of the locking pin 6 can be reversed by the elastic member 10.

A specific embodiment of the drive element 4 is described here. The driving member 4 may be any one of a hydraulic cylinder, an air cylinder, and a motor.

Preferably, the driving member 4 is provided as any one of a hydraulic cylinder and a pneumatic cylinder, and includes a cylinder body 41 having an inner chamber 412 and a piston 42 reciprocally disposed in the inner chamber 412.

Further preferably, the cylinder 41 is fixedly assembled to the fourth axis turret 2 of the numerical control machine, and is located below the piston 42 and provided with a driving medium inlet/outlet 411, the driving medium inlet/outlet 411 is located at a lower center position of the cylinder 41, and in this embodiment, the driving medium inlet/outlet 411 is specifically formed in an air joint assembled to a body of the cylinder 41.

It is understood that the driving medium inlet/outlet 411 may be used for introducing the driving medium into the inner cavity 412 of the cylinder 41 and also for discharging the driving medium from the inner cavity 412. When the driving piece 4 is set as a hydraulic cylinder, the driving medium is also hydraulic oil; when the drive element 4 is provided with a cylinder, the drive medium is also a gas.

When the driving medium enters the inner cavity 412 through the driving medium inlet/outlet 411, the piston 42 moves from bottom to top due to the increase of air pressure in the inner cavity 412, and at this time, the locking pin 6 can be driven to move from bottom to top; when the driving medium flows out of the inner cavity 412 through the driving medium inlet/outlet 411, the piston 42 is allowed to return from the top to the bottom by an external force (e.g., the force of the elastic member 10) due to the reduced air pressure in the inner cavity 412. It can be seen that the piston 42 is disposed above the cylinder 41, and the driving medium is introduced below the piston 42, so that the piston 42 moves, the locking pin 6 is driven, and the locking pin is driven well with a simple structure, thereby having an industrial practical value.

Further preferably, the piston 42 is coupled with the inner wall of the cylinder 41 in a sealing manner, so as to ensure the tightness of the inner cavity 412 of the cylinder 41. As shown, the outer surface of the piston 42 has an annular groove recessed radially inward, and an O-ring 11 is disposed in the annular groove, and the O-ring 11 is tightly clamped between the piston 42 and the inner wall of the cylinder 41.

Of course, the preferred embodiment shows the implementation of the driving member 4 driving the locking pin 6 to move from bottom to top, while in a variant, the driving member 4 driving the locking pin 6 to move from top to bottom can also be implemented by simple adjustment of the driving member 4, for example, forming a closed space above the piston 42 and introducing a driving medium into the space, although there are other variants that are not enumerated.

Further, the driving assembly further comprises a transmission piece 5, all the locking pins 6 are connected with the transmission piece 5, and the elastic piece 10 and the driving piece 4 drive the locking pins 6 to reciprocate up and down through the transmission piece 5.

Specifically, in the preferred embodiment, the transmission member 5 is disposed below the clamp body 3 and supported on the piston 42, the upper end of the transmission member is fixedly connected to the lower end of the rod portion 602 of the locking pin 6 through any one of a thread, a buckle, and an interference, and two ends of the elastic member 10 respectively act on the transmission member 5 and the clamp body 3; when the driving piece 4 is started, the piston 42 moves from bottom to top and drives the locking pin 6 to move from bottom to top through the driving piece 5, and during the process, the driving piece 5 and the clamp body 3 move relatively close to each other so that the elastic piece 10 generates compressive elastic deformation; when the driving member 4 is stopped, the elastic member 10 is deformed again and drives the locking pin 6 to move from top to bottom through the driving member 5. Therefore, the locking pin 6 automatically moves from top to bottom under the action of the elastic piece 10, and the expansion sleeve 7 is always in the locking state in the machining process of the cycloid disc 1. Of course, in a modified embodiment, the elastic member 10 may be elastically deformed in a stretching manner or in a twisting manner when the piston 42 moves from bottom to top.

Further, the number of the transmission members 5 is set to be a plurality corresponding to the number of the locking pins 6, the transmission members 5 have a transmission rod 51 and a boss 52 located at the lower end of the transmission rod 51, the upper end of the transmission rod 51 is connected to a corresponding locking pin 6, the lower end of the boss 52 is supported on the piston 42, and the boss 52 is spaced from the clamp body 3 by a certain distance, which needs to be accurately positioned in order to ensure the accuracy in the specific implementation; and the elastic member 10 is located between the clamp body 3 and the boss 52.

In one embodiment, the elastic element 10 is a compression spring sleeved on the transmission rod 51, and the lower end of the elastic element 10 abuts against the upper surface of the boss 52.

In addition, corresponding to a plurality of transmission pieces 5, the number of the elastic pieces 10 is set to be a plurality and corresponds to the number of the transmission pieces 5 one by one, and each transmission rod 51 is sleeved with a corresponding one of the elastic pieces 10.

Of course, the number of the transmission members 5 and the number of the elastic members 10 are not limited to this embodiment, for example, in a modified embodiment, the number of the transmission members 5 may be set to one and correspond to a plurality of the locking pins 6 at the same time in a one-to-many manner (for example, a plurality of bosses 52 in the preferred embodiment are integrally set to configure one transmission member 5 of the modified embodiment, and the transmission member 5 may be coupled with a plurality of the locking pins 6 at the same time); correspondingly, in the modified embodiment, the number of the elastic members 10 may be set to one and correspond to a plurality of the transmission members at the same time in a one-to-many manner (for example, a plurality of the elastic members 10 in the preferred embodiment are integrally set to constitute one elastic member 10 of the modified embodiment, and the elastic member 10 may drive a plurality of the transmission members 5 at the same time), or may be set to one and correspond to one of the transmission members in a one-to-one manner (for example, a plurality of the bosses 52 in the preferred embodiment are integrally set to constitute one transmission member 5 of the modified embodiment, and a plurality of the elastic members 10 in the preferred embodiment are integrally set to constitute one elastic member 10 of the modified embodiment, so that the elastic members 10 drive the transmission member 5 to drive a plurality of the locking pins 6 at the same time), and other modifications are not enumerated.

Further, one of the fixture body 3 and the transmission member 5 is provided with a guide pin 8 protruding laterally, and the other is provided with a guide groove 51 extending vertically and matching with the guide pin 8, so that when the transmission member 5 moves vertically, the guide pin 8 moves vertically in the guide groove 51 and limits the transmission member 5 to rotate around the vertically extending axis, that is, the transmission member 5 is prevented from rotating horizontally, and the movement direction of the transmission member 5 is limited.

Referring to the embodiment shown in fig. 8, the guide pin 8 is disposed on the fixture body 3, specifically, the lower portion of the fixture body 3 has a mounting hole 34, one end of the guide pin 8 is embedded in the mounting hole 34 in an interference manner, and the other end of the guide pin 8 protrudes laterally through the mounting hole 34. Correspondingly, the guide groove 51 is arranged on the surface of the transmission piece 5, and the guide pin 8 is inserted into the guide groove 51. Thus, when the transmission member 5 moves up and down, the guide pin 8 moves up and down in the guide groove 51 and restricts the transmission member 5 from rotating around an axis extending up and down, that is, prevents the transmission member 5 from rotating horizontally, thereby restricting the movement direction of the transmission member 5. Of course, this is not limiting, for example, in a variant embodiment, the guide slot 51 and the guide pin 8 may be interchanged, i.e. the guide slot is provided on the clamp body 3 and the guide pin is provided on the transmission member 5.

The lower surface of the fixture body 3 is provided with a hole structure 33 which is concavely arranged upwards, the piston 42 is provided with a column structure 421 which extends upwards into the hole structure 33, and the column structure 421 is matched with the hole structure 33 in shape and is movably inserted and matched up and down, so that the motion of the piston 42 can be limited through the matching of the column structure 421 and the hole structure 33, and the piston 42 is guided to move up and down stably.

Further, the hole structure 33 penetrates through the fixture body 3 up and down and is arranged coaxially with the cycloid disc 1, and the positioning fixture further comprises a loading and unloading auxiliary part 9. The handling aid 9 is arranged in the hole structure 33 of the clamp body 3; the lower end of the auxiliary assembly and disassembly part 9 is detachably connected to the column structure 421 by a thread, a buckle or other means, and when the central hole on the cycloid disc needs to be formed, the auxiliary assembly and disassembly part 9 can be removed so as not to interfere with the placement of the cycloid disc and the forming of the central hole; meanwhile, after the center hole is formed, it is convenient to form the positioning jig into a modular structure that can be integrally moved by the loading and unloading auxiliary member 9 mounted to the pillar structure 421, so that it can be integrally assembled and disassembled on the fourth axis rotary table 2.

Specifically, the upper end of the handling auxiliary 9 has an operable portion exposed above the clamp body 3, and on one hand, the positioning clamp can be formed into an integrally movable modular structure through the operable portion at the upper end of the handling auxiliary 9, so as to be integrally assembled and disassembled on the fourth shaft turntable 2; on the other hand, the loading and unloading aid 9 is movable relative to the gripper body 3 so as not to interfere with the up-and-down movement of the piston 42 relative to the gripper body 3.

Further, the assembling process of the positioning jig according to an embodiment of the present invention substantially includes:

the O-shaped sealing ring 11 is embedded in an annular groove on the outer surface of the piston 42, and the piston 42 with the O-shaped sealing ring 11 is arranged in the inner cavity 411 of the cylinder 41, at the moment, the O-shaped sealing ring 11 is tightly clamped between the piston 42 and the inner wall of the cylinder 41;

the four elastic elements 10 are respectively sleeved outside the corresponding transmission elements 5, and the transmission elements 5 are supported on the pistons 42;

fitting four transmission pieces 5 respectively below the chuck body 3 such that four transmission piece 5 positions correspond to the positions of the four positioning passages 32 of the chuck body 3 and the guide groove 51 of each transmission piece 5 corresponds to the position of the guide pin 8 of the chuck body 3 (i.e., such that the guide pin 8 is inserted in the guide groove 51);

the four locking pins 6 which are respectively sleeved with the expansion sleeves 7 are fixedly connected to the transmission part 5 after respectively penetrating through the positioning channels 32 of the fixture body 3 from top to bottom; of course, after the cycloid disc 1 is placed on the upper surface of the fixture body 3, the four locking pins 6 respectively sleeved with the expansion sleeves 7 may be respectively passed through the positioning holes 1a and the positioning channels 32 corresponding to the positioning holes 1a from top to bottom and then fixedly connected to the corresponding transmission members 5.

Finally, the lower end of the auxiliary assembly/disassembly member 9 passes through the hole structure 33 of the fixture body 3 from top to bottom until being fixedly connected with the pillar structure 421 of the piston 42, thereby completing the assembly of the whole positioning fixture.

It should be noted that the above assembling process is only a specific example, and does not limit the present invention. The skilled person can make reasonable changes to the sequence of the steps according to actual needs, for example, after the locking pin 6 is fixedly connected with the transmission member 5, the transmission member 5 is coupled with the fixture, and so on, and other changes are not enumerated.

Further, the process of mounting the positioning fixture on the fourth axis turntable 2 according to an embodiment of the present invention substantially includes:

holding the operable portion of the loading and unloading assist member 9, and moving the positioning jig as a whole to place the positioning jig at a pre-load position on the fourth axis turn table 2;

the fixture body 3 and the cylinder 41 are fixedly assembled to the fourth axis turret 2 by a fastening member, and the positioning fixture is mounted on the fourth axis turret 2.

Further, the clamping and positioning process of the positioning fixture to the cycloid disc 1 (i.e. the application of the positioning fixture in the numerical control drilling and milling process of the cycloid disc) according to an embodiment of the present invention generally includes:

before the cycloid disc 1 is placed, the expansion sleeve 7 and the locking pin 6 are separated from the transmission piece 5 and placed, at this time, the driving piece 4 is started to operate, a driving medium is introduced into the inner cavity 412 through the driving medium inlet and outlet 411, the piston 42 drives the transmission piece 5 to move from bottom to top, in the process, the guide pin 8 of the fixture body 3 slides along the guide groove 51 of the transmission piece 5, and the elastic piece 10 is compressed and deformed;

placing the cycloid disc 1 on the upper surface 31 of the fixture body 3, and adjusting the position of the cycloid disc 1 so that four positioning holes 1a of the cycloid disc 1 correspond to four positioning channels 32 respectively;

the four locking pins 6 respectively sleeved with the expansion sleeves 7 are respectively matched and connected to a transmission member 5, specifically, after the lower ends of the rod portions 602 of the locking pins 6 pass through the positioning holes 1a and the positioning channels 32 from top to bottom, the locking pins are fixedly assembled at the upper end of the transmission member 5 by means of threads, buckles and the like, at this time, the tapered portions 601 of the locking pins 6 and the expansion sleeves 7 are at least partially accommodated in the positioning holes 1a or slightly higher than the positioning holes 1a, and the outer surfaces of the expansion sleeves 7 just contact with the hole walls of the positioning holes 1a or are slightly separated from the hole walls of the positioning holes 1 a;

the driving element 4 is stopped, at this time, under the driving of the elastic element 10, the driving element 5 pulls the locking pin 6 to synchronously reset downwards, in the process, the driving medium in the inner cavity 412 can be discharged through the driving medium inlet and outlet 411, the piston 42 moves downwards to reset, and the lower end surface is abutted by the limiting surface 321 to stop the downward movement of the expansion sleeve 7, the locking pin 6 moves downwards relative to the expansion sleeve 7 and extrudes the expansion sleeve 7 outwards, so that the expansion sleeve 7 expands outwards in the radial direction, the expansion sleeve 7 tightly clamps the hole wall of the positioning hole 1a, the expansion sleeve 7 changes from the unlocking state to the locking state, that is, the positioning fixture completes the positioning and clamping of the cycloid disc 1.

Of course, the unlocking process of the positioning fixture on the cycloid disc 1 may be as follows: the driving element 4 is started to operate, a driving medium is introduced into the inner cavity 412 through the driving medium inlet and outlet 411, the piston 42 overcomes the elastic force of the elastic element 10, the driving element 5 drives the locking pin 6 to move from bottom to top, in the process, the tapered part 601 of the locking pin 6 gradually separates from the expansion sleeve 7 upwards, so that the expansion sleeve 7 is radially retracted and reset to be in the unlocking state, the cycloid disc 1 is unlocked, and the cycloid disc 1 can be taken down upwards.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a positioning fixture that cycloid dish numerical control bored and milled processing which characterized in that includes:

2. The positioning fixture for the cycloid disc numerical control drilling and milling machining as claimed in claim 1, wherein the cone part has an outer surface which is inwardly contracted from the top to the bottom towards the center line of the locking pin, the expansion sleeve has a limited surface, and the fixture body has a limited surface;

3. The positioning fixture for the cycloid disc numerical control drilling and milling machining as claimed in claim 2, wherein,

the upper part of the positioning channel is provided with a step part forming the limiting surface, and the lower end of the expansion sleeve is accommodated in the positioning channel and is propped against the step part.

4. The positioning fixture for the cycloid disc numerical control drilling and milling machining as claimed in claim 1, wherein the driving assembly comprises:

the locking pins are connected with the transmission piece;

5. The positioning fixture for the cycloid disc numerical control drilling and milling machining as claimed in claim 4, wherein the driving part comprises:

6. The positioning fixture for the numerical control drilling and milling of the cycloid disc as claimed in claim 5, wherein the lower surface of the fixture body is provided with a hole structure which is recessed upwards, the piston is provided with a column structure matched with the hole structure in shape, and the column structure extends into the hole structure in a vertically movable manner.

7. The positioning fixture for the numerical control drilling and milling machining of the cycloid disc as claimed in claim 6, wherein the hole structure penetrates through the fixture body up and down and is coaxial with the cycloid disc;

8. The positioning fixture for the cycloid disc numerical control drilling and milling machining is characterized in that the transmission piece is provided with a transmission rod connected with the locking pin and a boss located at the lower end of the transmission rod, the transmission piece is movably located below the fixture body up and down, and the boss and the fixture body are distributed at intervals;

the elastic piece is positioned between the clamp body and the boss;

9. The positioning fixture for the cycloid disc numerical control drilling and milling machining as claimed in claim 8, wherein the transmission member is connected with at least three locking pins in a one-to-one correspondence manner;

the elastic piece is a pressure spring sleeved on the transmission rod.

10. The positioning fixture for the cycloid disc numerical control drilling and milling machining as claimed in claim 4, wherein one of the fixture body and the transmission member is provided with a laterally protruding guide pin, and the other is provided with a guide groove which extends in the up-down direction and is matched with the guide pin.

11. The positioning fixture for the cycloid disc numerical control drilling and milling machining as claimed in claim 1, wherein the positioning channel corresponds to at least three positioning assemblies one to one.