阅读说明：本技术 一种用于电机壳加工的数控机床夹具 (Numerical control machine tool clamp for machining motor shell ) 是由 张启斌 邵伯明 尤国金 张明涛 蒋奎 林程峰 周陈伟 王强 于 2019-03-08 设计创作，主要内容包括：本发明公开了一种用于电机壳加工的数控机床夹具,涉及夹具,用于解决普通夹具装夹机壳时容易致使其变形的问题,包括安装于机架上的液压三抓卡盘,还包括固定于液压三抓卡盘的卡爪上的定心支撑块,所述定心支撑块的数量和卡爪的数量相等,且多个定心支撑块相互拼接后形成空心状的定心柱；本发明具有以下优点和效果：内支撑形式的定心支撑块能够在支撑机壳的过程中对机壳进行矫正,减小定位过程中机壳内中心轴线的偏移,以方便后续对刀时找准机壳中心轴线的位置,提高机壳上穿轴孔与机壳内腔之间的同轴度,从而达到降低机壳废品率的目的。(The invention discloses a numerical control machine tool clamp for machining a motor shell, which relates to a clamp and is used for solving the problem that a common clamp is easy to deform when clamping the motor shell, and comprises a hydraulic three-grab chuck arranged on a rack and also comprises centering support blocks fixed on jaws of the hydraulic three-grab chuck, wherein the number of the centering support blocks is equal to that of the jaws, and a plurality of centering support blocks are spliced to form a hollow centering column; the invention has the following advantages and effects: the centering support block in the inner support form can correct the shell in the process of supporting the shell, reduces the offset of the central axis in the shell in the positioning process, facilitates the subsequent alignment of the position of the central axis of the shell during tool setting, improves the coaxiality between the shaft penetrating hole in the shell and the inner cavity of the shell, and achieves the purpose of reducing the rejection rate of the shell.)

1. The utility model provides a digit control machine tool anchor clamps for motor casing processing, is including installing chuck (1) are grabbed to hydraulic pressure three in the frame, its characterized in that: the three-jaw chuck is characterized by further comprising centering support blocks (2) fixed on jaws (6) of the hydraulic three-jaw chuck (1), wherein the number of the centering support blocks (2) is equal to that of the jaws (6), and a plurality of centering support blocks (2) are spliced with one another to form a hollow centering column.

2. The numerical control machine tool fixture for machining the motor casing according to claim 1, wherein: at least two rows of elastic buffer pads (21) distributed in a point shape are arranged on the outer circle side wall of each centering support block (2), the elastic buffer pads (21) in the same row are distributed along the length direction of the centering support block (2), and the two rows of elastic buffer pads (21) are distributed on the centering support block (2) and are close to the edge positions of the adjacent centering support blocks (2).

3. The numerical control machine tool fixture for machining the motor casing according to claim 2, wherein: the excircle diameter of centering supporting shoe (2) is from keeping away from the one end of hydraulic pressure three and grabbing chuck (1) to the in-process that jack catch (6) are close to and increases gradually, the tapering of centering supporting shoe (2) excircle lateral wall is 1~3, and same elastic buffer pad (21) of being listed as is at the in-process that distributes, from keeping away from the one end of hydraulic pressure three and grabbing chuck (1) to the in-process that jack catch (6) are close to, and distance between each other also increases gradually.

4. The numerical control machine tool fixture for machining the motor casing according to claim 1, wherein: the three-jaw centering device is characterized by further comprising a centering block (3) fixed on the hydraulic three-jaw chuck (1) and positioning grooves (4) formed in the centering supporting blocks (2), wherein the centering block (3) is distributed between two adjacent jaws (6), after the two adjacent centering supporting blocks (2) are spliced with each other, the positioning grooves (4) in the centering supporting blocks are completely closed, and the centering block (3) is right opposite to the positioning grooves (4) in the two adjacent centering supporting blocks (2).

5. The numerical control machine tool fixture for machining the motor casing according to claim 4, wherein: the centering block (3) faces the surface on one side of the centering support block (2) and is arc-shaped matched with the groove bottom of the positioning groove (4), an oblique chamfer (31) used for guiding the centering block (3) to enter the positioning groove (4) is arranged on the arc surface (32) of the centering block (3) and close to the edge of the clamping jaw (6), and a guide inclined plane (41) used for being matched with the oblique chamfer (31) is arranged on the edge of the positioning groove (4) on the centering support block (2).

6. The numerical control machine tool fixture for machining the motor casing according to claim 1, wherein: centering supporting shoe (2) are fixed mutually with jack catch (6) through coupling assembling (5), coupling assembling (5) including set up on jack catch (6) and degree of depth along spout (51), the integrative slider (52) that sets up on centering supporting shoe (2) that the direction of motion that the card grabbed extends, set up on centering supporting shoe (2) its inlays and locate in spout (51), set up threaded hole (53) that run through on slider (52), threaded hole (53) female connection has fixing bolt (54), and fixing bolt (54) pass the bottom of slot of tight at spout (51) of one end support of threaded hole (53).

7. The numerical control machine tool fixture for machining the motor casing according to claim 6, wherein: the cross sectional shape of spout (51) can be the T font, and spout (51) just is the slope setting to the inner wall of self tank bottom, the cross sectional shape of slider (52) can be the I-shaped, and its surface that is located spout (51) and back to spout (51) diapire one side also is the slope setting.

Technical Field

The invention relates to a clamp, in particular to a numerical control machine tool clamp for machining a motor shell.

Background

The motor is a power element which is quite commonly used in industry, one of the key factors determining the power conversion efficiency of the motor is the concentricity between the inner cavity of the motor and a shaft penetrating hole which is formed in a machine shell and used for a rotor to penetrate through, so that the concentricity of the motor needs to be ensured as much as possible in the process of turning the shaft penetrating hole, the key influencing the parameter is the clamping precision of machine shell machining, generally, the machine shell is machined on a numerical control machine tool, and a clamp is a three-grab chuck.

At present, the invention with the authority bulletin number of CN206405449U discloses a high-efficiency three-claw chuck for machine tool machining, which comprises a chuck body, a clamping part, a large bevel gear, a mounting groove, an auxiliary clamping plate and a connecting chassis, wherein a rectangular groove is arranged at the top end of the chuck body, a clamping jaw is connected in the rectangular groove, a second gear part is arranged at the bottom of the clamping jaw, the clamping part is arranged at different horizontal positions of the clamping jaw, the large bevel gear is arranged below the clamping jaw, the mounting groove is connected to two sides of the clamping part, a reset spring is arranged in the mounting groove, an auxiliary clamping plate is arranged at one end of the reset spring through a connecting piece, an arc-shaped groove is fixedly connected to the port of the auxiliary clamping plate, and the connecting chassis is fixed at.

According to the three-claw chuck, in the process of clamping and fixing the shell, due to the fact that the thickness of the shell is small, the shell is easy to deform due to the fact that the clamping claws extrude the shell, the coaxiality of the shell and the inner cavity of the shell is difficult to guarantee in the process that the shell penetrates through the shaft hole, the shell with the overlarge deviation amount cannot be used and must be discarded, and therefore the rejection rate of the shell is easy to be too high due to the clamping type fixing mode.

Disclosure of Invention

The invention aims to provide a numerical control machine tool clamp for machining a motor shell, which has good clamping stability and can reduce deformation of the motor shell in a clamping process so as to improve the machining precision of the motor shell, thereby achieving the purpose of reducing the rejection rate of the motor shell.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a digit control machine tool anchor clamps for motor casing processing, is including installing the three chucks of grabbing of hydraulic pressure in the frame, still including being fixed in the centering supporting shoe on the jack catch of the three chucks of grabbing of hydraulic pressure, the quantity of centering supporting shoe equals with the quantity of jack catch, and forms hollow form centering post after a plurality of centering supporting shoes splice each other.

By adopting the scheme, before processing, the shell is sleeved on the centering support block, then the hydraulic three-grab chuck is started, so that the clamping jaws drive the centering support block to move towards the side away from each other, and in the process of expanding the centering support block outwards, will collide with the inner wall of the machine shell to fix the machine shell, and in the moving process of the jaws of the hydraulic three-jaw chuck, the movement of the centering support block is almost synchronous, so that the outer circular surface of the centering support block can be basically ensured to be positioned on the same circular surface in the outward movement process, therefore, in the process of expanding the shell, the shell can be ensured to be uniformly deformed as much as possible, and the offset of the central axis of the inner cavity of the shell is reduced, so that the coaxiality between the turned through shaft hole and the central axis of the inner cavity of the shell can be ensured as much as possible by the turning tool in the process of drilling the shell, and the purpose of reducing the rejection rate of the shell is achieved; as for the cavity that encloses between the centering supporting shoe, then can supply the lathe tool to pass through when the casing is drilled to avoid influencing the trend of lathe tool.

The invention is further provided with: at least two rows of elastic buffer pads distributed in a point shape are arranged on the outer circle side wall of each centering support block, the elastic buffer pads in the same row are distributed along the length direction of the centering support block, and the two rows of elastic buffer pads are distributed on the centering support block and are close to the edge positions of the adjacent centering support blocks.

By adopting the scheme, after elastic buffering cushions which are distributed in a dotted manner are arranged on the centering supporting block, after the claw expands and drives the centering supporting block to be in contact with the inner wall of the shell, a gap is actually formed between the inner wall of the shell and the outer circular surface of the centering supporting block, so that the elastic buffering cushions still can obstruct the contact between the shell and the centering supporting block in the process of taking materials after the shell is processed, and the metal fragments positioned between the shell and the centering supporting block cannot easily form grinding and scraping on the inner wall of the shell, thereby making the case less susceptible to damage; and after the edge position of each centering support block is provided with the elastic cushion pad, the centering support block can apply expansion force to the shell more evenly in the expanding process, so that the deformation degree of the shell is reduced, and the processing precision of the shell is further improved.

The invention is further provided with: the excircle diameter of centering support block is from keeping away from the one end of hydraulic pressure three and grabbing the in-process that the chuck is close to the jack catch and increases gradually, the tapering of centering support block excircle lateral wall is 1~3, and same row of elastic buffer pad is at the in-process that distributes, from keeping away from the one end of hydraulic pressure three and grabbing the chuck and being close to the in-process to the jack catch, and distance between each other also increases gradually.

The motor shell is processed by adopting the modes of firstly punching and then cutting, metal materials are easy to extend and deform in the stamping forming process, and finally the motor shell has certain ellipticity, so that the central axis is easy to deviate in the fixing process, by adopting the scheme, after the taper is arranged on the outer circular surface of the centering support block, in the process of expanding the motor shell, firstly, the elastic cushion pad close to the hydraulic three-grab chuck is firstly contacted with the inner wall of the motor shell, and the elastic cushion pad expands a little and then the motor shell is gradually expanded by the subsequent elastic cushion pad, so the advantages of gradually offsetting the ellipticity generated in the casting process by the deformation of the motor shell and gradually repairing the ellipticity, and gradually correcting the central axis of the motor shell, therefore, the position of the central axis of the shell can be found more easily during subsequent tool setting, so that the hole formed in the shell can have higher coaxiality with the shell; the conicity value of 1-3 degrees is selected because the conicity value can improve the positioning firmness of the machine shell and is within the deformation bearing range of the aluminum product; but the existence of the taper inevitably causes the extrusion force between the opening part of the machine shell and the elastic cushion pad close to the hydraulic three-grip chuck to be very large, thus causing the outward bending flaring radian to appear in the process that the machine shell extends from the opening part to the inner cavity gradually, and the flaring radian of the part of the machine shell far away from the hydraulic three-grip chuck is smaller, and the change of the flaring radian actually represents the distance change between the inner wall of the machine shell and the surface of the centering support block, and the distance between the part of the machine shell far away from the hydraulic three-grip chuck and the centering support block is smaller, if the elastic cushion pads are distributed equidistantly, the part of the machine shell between the two elastic cushion pads far away from the hydraulic three-grip chuck can directly interfere with the centering support block, so that the centering support block can push and scrape the inner wall of the machine shell by the residual chips of the previous processing in the process when the machine shell is opened outwards, and then lead to the casing inner wall to damage, and also set the interval distance between the elastic buffer cushion to the back that changes gradually like this, can guarantee as far as possible that every elastic buffer cushion all forms the support to the inner wall of casing, when improving casing location firmness, make the distance between casing inner wall and the centering supporting shoe surface can keep the same and great distance as far as possible, just so be difficult to receive clastic mill and scrape to make the casing be difficult to produce more and draw the damage.

The invention is further provided with: the centering device is characterized by further comprising a centering block fixed on the hydraulic three-jaw chuck and locating grooves formed in the centering support blocks, wherein the centering block is distributed between every two adjacent jaws, after every two adjacent centering support blocks are spliced with each other, the locating grooves formed in the two adjacent centering support blocks are completely closed, and the centering block is opposite to the locating grooves formed in the two adjacent centering support blocks.

Because the shell is internally supported and fixed, a limit value is inevitably required in the outward expanding process of the centering support block, if the centering support block is controlled only by an oil way in the hydraulic three-grab chuck, the shell is easy to prop and crack in case of failure of the oil way, by adopting the scheme, when the centering support block is in the outward expanding process, the centering support block can be blocked by the centering block when the centering support block is in contact with the centering block to limit the centering support block to be continuously expanded outward, so that the expansion force of the shaping support block to the shell is ensured to be in a range which can be borne by the shell, and the shell is difficult to prop and crack, thereby achieving the purpose of further reducing the rejection rate.

The invention is further provided with: the surface of one side of the centering support block, which faces the centering support block, is arc-shaped and matched with the groove bottom of the positioning groove, an oblique chamfer used for guiding the centering block to enter the positioning groove is arranged on the arc surface of the centering block and close to the edge of the clamping jaw, and a guide inclined surface used for being matched with the oblique chamfer is arranged on the edge of the centering support block and located at the positioning groove.

By adopting the scheme, the centering support block inevitably rubs with the centering support block in the outward expansion process, and the arc surface on the centering support block is mainly used for improving the fit degree between the centering support block and the centering support block, so that the centering support block can uniformly bear the extrusion force transmitted by the centering support block when in contact with the centering support block, the over-serious abrasion of the centering support block caused by nonuniform stress is reduced, and the positioning accuracy of the centering support block by the centering support block is improved; and the inclined chamfer on the centering block and the guide inclined plane at the edge of the positioning groove can guide the centering block to gradually enter the positioning groove when the centering block and the positioning groove are in mutual contact in the outward expansion process of the centering support block, so that the centering support block can be positioned.

The invention is further provided with: the centering supporting block is fixed with the clamping jaw through the connecting assembly, the connecting assembly comprises a sliding groove and a sliding block, the sliding groove is arranged on the clamping jaw, the depth of the sliding groove extends along the moving direction of the clamping jaw, the sliding block is integrally arranged on the centering supporting block and embedded in the sliding groove, a through threaded hole is formed in the sliding block, a fixing bolt is connected in the threaded hole in a threaded mode, and one end, penetrating through the threaded hole, of the fixing bolt abuts against the bottom of the sliding groove.

By adopting the scheme, the positions of the centering support blocks on the clamping jaws can be conveniently adjusted in the installation process after the clamping jaws and the centering support blocks are arranged into a detachable structure, so that the centering support blocks can be completely attached to each other and then fixed, the outer circular side walls of the centering support blocks can be positioned on the same circular arc surface in the process that the centering support blocks are outwards expanded by the clamping jaws, and the deviation of the central axis of the shell in the fixing process is reduced as much as possible; and because the fixed bolt is in threaded fit with the sliding block, when the fixed bolt is tightly supported on the bottom of the sliding groove, the sliding block is pushed to be tightly supported on the inner wall of the sliding groove on one side facing to the bottom of the sliding groove, so that the friction between the fixed bolt and the clamping jaw is processed, and the sliding block is limited by the friction between the self and the clamping jaw, so that the centering support block and the clamping jaw are more firmly fixed.

The invention is further provided with: the cross-sectional shape of spout can be the T font, and the spout is just to the inner wall of self tank bottom and be the slope setting, the cross-sectional shape of slider can be the I-shaped, and its surface that is located the spout and just back to spout diapire one side also is the slope setting.

Through adopting above-mentioned scheme, the spout of T font and the slider of I-shaped after mutually supporting, can restrict the slider and deviate from in the spout, and just set up the spout to the inner wall slope of self tank bottom after, under the unchangeable condition of the inside width of spout, the slope sets up the area that can increase this inner wall, when fixing bolt pushed away slider and this inner wall and held tightly like this, just can possess bigger area of contact between slider and the jack catch, area of contact is big more, frictional force between two objects of mutual contact is also big more so, and then improve the firm in connection between centering support column and the jack catch.

In conclusion, the invention has the following beneficial effects:

1. the centering support block in the inner support form can correct the shell in the process of supporting the shell, so that the offset of the central axis in the shell in the positioning process is reduced, the position of the central axis of the shell is conveniently found in the subsequent tool setting process, the coaxiality between the shaft penetrating hole in the shell and the inner cavity of the shell is improved, and the purpose of reducing the rejection rate of the shell is achieved;

2. the elastic cushion can block the contact between the inner wall of the shell and the centering support block, so that the shell and the centering support block are not easy to clamp the chips, the shell is not easy to be scratched by the chips in the taking-off process, and the aim of reducing the damage of the shell is fulfilled;

3. taper on the centering supporting block and the elastic buffer pad that interval variation distributes each other can correct the ellipticity of casing gradually at the in-process that struts the casing, make things convenient for the tool setting process of lathe tool to further improve the trompil precision of casing.

Drawings

Fig. 1 is an overall structural view of the present invention.

In the figure: 1. a hydraulic three-grab chuck; 2. centering the supporting block; 21. an elastic cushion pad; 3. a righting block; 31. chamfering; 32. a circular arc surface; 4. positioning a groove; 41. a guide ramp; 5. a connecting assembly; 51. a chute; 52. a slider; 53. a threaded hole; 54. fixing the bolt; 6. a claw is provided.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, a numerical control machine tool fixture for machining a motor casing comprises a hydraulic three-grip chuck 1, a centering support block 2, a centering block 3 and a positioning groove 4, wherein the hydraulic three-grip chuck 1 is fixed on a main shaft of a numerical control machine tool; the number of the centering support blocks 2 is equal to the number of the clamping jaws 6 of the hydraulic three-jaw chuck 1, the centering support blocks are fixed on the clamping jaws 6 through the connecting assembly 5, and the centering support blocks 2 are spliced with each other to form hollow centering columns.

The excircle diameter of centering supporting shoe 2 is followed the one end of keeping away from hydraulic pressure three and is grabbed chuck 1 and is close to the in-process that claw 6 is close to and is crescent, and back on the centering post that centering supporting shoe 2 is constituteed was located to the casing cover like this, when centering supporting shoe 2 outwards expands under the drive of claw 6 and open, can strut the casing gradually. And in order to avoid propping the casing and split, set up the outer disc taper of centering supporting shoe 2 to be suitable between 1~3, be difficult to prop the casing and split promptly like this, also can fully fill up the inner chamber of casing simultaneously to improve the fixed firmness of casing.

At least two rows of elastic buffer cushions 21 made of hard rubber are embedded on each centering support block 2, the elastic buffer cushions 21 in the same row are arranged along the length direction of the centering support block 2, the two rows of elastic buffer cushions 21 are respectively positioned at the side positions where the centering support blocks 2 are attached to each other, and in the process that the elastic buffer cushions 21 in the same row are distributed from one end close to the hydraulic three-jaw chuck 1 to the other end, the distance between every two adjacent elastic buffer cushions 21 is gradually reduced.

The connecting assembly 5 comprises a sliding groove 51, a sliding block 52, a threaded hole 53 and a fixing bolt 54, the section of the sliding groove 51 is T-shaped and is arranged on the clamping jaw 6, the depth direction of the sliding groove is parallel to the moving direction of the clamping jaw 6, and the sliding groove 51 is obliquely arranged right facing the inner wall of one side of the bottom of the sliding groove; the section of the sliding block 52 is I-shaped, the sliding block is integrally arranged on the outer circle side wall of the centering support block 2 and is mutually embedded with the sliding groove 51 when being installed, and the sliding block 52 is positioned in the sliding groove 51 and is also obliquely arranged on the surface of one side back to the bottom of the sliding groove 51; the threaded hole 53 is formed in the slider 52 and penetrates through the slider 52; the fixing bolt 54 is screwed into the threaded hole 53, and one end of the fixing bolt penetrating through the threaded hole 53 abuts against the bottom of the sliding groove 51, so that the inclined surface on the sliding block 52 and the inner wall of the sliding groove 51 which is arranged in an inclined manner abut against each other.

The number of the centering blocks 3 is equal to that of the centering support blocks 2, the centering support blocks are fixed on the hydraulic three-grab chuck 1 and located between two adjacent clamping jaws 6, and the extending surfaces of the end surfaces of the two adjacent centering support blocks 2, which are attached to each other, pass through the center of the centering blocks 3. The positioning grooves 4 are formed in the circumferential side walls of the centering support blocks 2, the positioning grooves 4 in the two centering support blocks 2 are completely closed after the two adjacent centering support blocks 2 are attached to each other, and the inner walls, away from one side of each other, of the positioning grooves 4 in the two centering support blocks 2 are obliquely arranged to form guide inclined planes 41.

The surface of the righting block 3 facing one side of the positioning groove 4 is arc-shaped matched with the groove bottom of the positioning groove 4, the surface of the righting block 3 is an arc surface 32 due to the arc-shaped structure, and oblique chamfers 31 used for guiding the righting block 3 to enter the positioning groove 4 are arranged on two sides of one end, close to the centering support block 2, of the righting block 3.