High-precision double-clamping hard turning clamp

Abstract

A high-precision double-clamping hard turning clamp comprises a right clamp body, the right end of the right clamp body is provided with a plurality of sliding blocks which are evenly distributed in the circumferential direction, and outer clamping heads are arranged on the right portions of the inner ends of the sliding blocks. A containing hole is formed in the center of the right clamp body, and a rear axle output shaft is arranged in the containing hole. A left clamp main body is arranged on the left side of the right clamp main body; an outer clamping device is arranged on the left clamp body, and the outer clamping device can control the sliding blocks to move and enable the sliding blocks to be clamped at the right end of the rear axle output shaft. The left clamp main body and the right clamp main body are connected through a connecting body; a clamping seat is arranged in the center of the connecting body, and an inner clamping hole communicated with the containing hole is formed in the center of the clamping seat. According to the high-precision double-clamping hard turning clamp, bearing retainers at the two ends of a rear axle output shaft can be clamped at the same time, the situation that the rear axle output shaft is eccentric due to the influence of centrifugal force generated by rotation of the clamp is avoided, and high-precision machining is achieved.

Description

Technical Field

[0001] The invention relates to the field of rear axle output shaft processing, in particular to a high-precision double-clamp hard turning fixture. Background Art

[0002] Hard turning refers to the technology of turning workpieces with higher hardness, and the hard turning fixture is used to clamp workpieces with higher hardness. Therefore, when the inner hole of the rear axle output shaft needs to be processed, it will be clamped by the hard turning fixture. The rear axle output shaft is different from the general shaft. Its outer wall has an annular protrusion, which causes the rear axle output shaft to be small at both ends and large in the middle. In this case, the traditional hard turning fixture cannot directly clamp the bearing gears at both ends of the rear axle output shaft, but can only clamp one end of the rear axle output shaft for processing. If only one end of the rear axle output shaft is clamped for processing, the centrifugal force generated by the high-speed rotation of the hard turning fixture can easily cause the rear axle output shaft to become eccentric, which ultimately affects the processing accuracy of the inner holes at both ends of the rear axle output shaft. Summary of the invention

[0003] The present invention aims to solve the existing technical problem by providing a high-precision double-clamp hard turning fixture, which can simultaneously clamp the bearing blocks at both ends of the rear axle output shaft, avoiding the eccentricity of the rear axle output shaft due to the influence of the centrifugal force generated by the rotation of the fixture, thereby achieving high-precision processing.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] The present invention discloses a high-precision double-clamp hard turning fixture, comprising a right fixture body, a plurality of sliding blocks uniformly distributed in a circumference at the right end of the right fixture body, an outer clamping head is arranged at the right part of the inner end of the sliding block; a receiving hole is arranged at the center of the right fixture body, and a rear axle output shaft is placed in the receiving hole; a left fixture body is arranged on the left side of the right fixture body; an outer clamping device is arranged on the left fixture body, and the outer clamping device can control the movement of the sliding block and clamp the plurality of sliding blocks at the right end of the rear axle output shaft; the left fixture body is connected with the right fixture body through a connecting body; a clamping seat is arranged at the center of the connecting body, and an inner clamping hole which is connected with the receiving hole is arranged at the center of the clamping seat; an inner clamping device matching with the inner clamping hole is arranged in the left part of the inner clamping hole, and the inner clamping device is clamped at the left end of the rear axle output shaft.

[0006] The external clamping device comprises a right movable hole arranged at the center of the right end surface of the left clamp body, and a left movable hole arranged at the center of the left end surface of the left clamp body, the right end of the left movable hole is connected with the center of the bottom of the right movable hole; a movable part matching with it is arranged in the right movable hole; an external joint is arranged at the center of the left end surface of the movable part, and the left end of the external joint passes through the left movable hole to the left; a plurality of jacking holes evenly distributed in a circle are arranged on the right clamp body; a plurality of fixed feet corresponding to the positions of the jacking holes are arranged on the outer wall of the right end of the movable part; a jacking column fixed with the fixed feet is arranged in the jacking hole; the right The right end face of the clamp body is provided with a plurality of slide grooves evenly distributed in a circle, and the slider is located in the slide groove; the right end outer cover of the right clamp body is provided with a limit cover, and the limit cover limits the slider in the slide groove through its own left inner wall; the center of the limit cover is provided with a feed port which is connected with the accommodating hole; the slider is provided with a guide slide hole, and the right end of the push column is provided with a guide head which matches the guide slide hole; the guide slide hole is provided with a plurality of evenly distributed pressure inclined surfaces, and the right end of the pressure inclined surface is inclined toward the center direction of the right clamp body; the outer wall of the guide head is provided with a plurality of pressure inclined surfaces which fit with the pressure inclined surface.

[0007] The fixing foot is provided with a fixing hole coaxial with the jacking hole; the center of the left end face of the jacking column is provided with a first screw hole; a fixing screw passes through the fixing hole to the right and is screwed into the first screw hole, and the head of the fixing screw fits against the left side wall of the fixing foot; the limit cover and the right clamp body are fixed by a number of evenly distributed limit screws.

[0008] The inner wall of the right end opening of the right movable hole is provided with a plurality of notches corresponding to the positions of the fixed feet; an auxiliary hole is provided on the inner wall on the left side of the notch; a plurality of grooves coaxial with the auxiliary hole are provided on the left end face of the left clamp body; the center of the bottom of the groove and the center of the bottom of the auxiliary hole are connected through the first through hole; a pressure plate is provided on the left side wall of the head of the fixing screw; a telescopic rod is provided at the center of the left side wall of the pressure plate; the left end of the telescopic rod is inserted into the first through hole to the left; a second screw hole is provided at the center of the left end face of the telescopic rod; an annular gasket is provided at the bottom of the groove to fit therewith; a connecting screw passes through the inner hole of the annular gasket to the right and is screwed into the second screw hole, and the head of the connecting screw fits with the left side wall of the annular gasket; an auxiliary spring outside the telescopic rod is provided between the left side wall of the pressure plate and the bottom of the auxiliary hole.

[0009] The outer wall of the jacking column is provided with a spiral oil groove; the outer wall of the right clamp body is provided with a plurality of oil injection holes which are connected with the jacking holes; the outer end openings of the oil injection holes are screwed with plugs which match them.

[0010] The outer wall of the sliding block is provided with a fine-tuning hole intersecting with the guide sliding hole, and the position of the fine-tuning hole corresponds to the position of the pressure inclined surface on the guide head; a fine-tuning screw matching with the fine-tuning hole is threaded in the fine-tuning hole.

[0011] The inner clamping device includes a positioning sleeve arranged in the left part of the inner clamping hole; the right side of the positioning sleeve has a positioning ring located in the inner clamping hole; the positioning sleeve and the positioning ring are connected by a number of positioning arms evenly distributed in a circle; the inner wall of the middle part of the inner clamping hole is provided with an annular positioning step, and the left side wall of the positioning ring fits with the positioning step; the outer wall of the left part of the rear axle output shaft is provided with an annular positioning part, and the left side wall of the positioning part fits with the right side wall of the positioning ring; a clamping claw sleeve is provided between the outer wall of the positioning sleeve and the inner wall of the inner clamping hole; the right end face of the clamping claw sleeve is provided with a number of clamping claws located between adjacent positioning arms; the clamping claws are evenly distributed in a circle outside the left end of the rear axle output shaft; the inner wall of the inner clamping hole is provided with an inner clamping cone surface that is narrow on the left and wide on the right; the outer wall of the right end of the clamping claw is provided with an inner clamping oblique arc surface that matches the inner clamping cone surface; a traction mechanism is provided in the external joint, and the traction mechanism can control the left and right movement of the clamping claw sleeve.

[0012] The traction mechanism includes an inner joint arranged in the outer joint, and the inner joint is coaxial with the outer joint; the inner wall of the left end hole of the inner clamping hole is provided with a first limiting portion in an annular shape; the inner wall of the clamping jaw sleeve is provided with a second limiting portion in an annular shape; the inner wall of the left end port of the positioning sleeve is provided with a third limiting portion in an annular shape; the right end of the inner joint passes through the first limiting portion, the second limiting portion, and the third limiting portion in sequence to the right and penetrates into the right end port of the positioning sleeve; the outer wall of the right part of the inner joint is provided with a locking step that fits with the right side wall of the second limiting portion; the outer wall of the right end of the inner joint is provided with an annular locking portion; a pressure spring that is sleeved on the outside of the inner joint is provided between the left side wall of the locking portion and the right side wall of the third limiting portion; the inner joint is provided with an auxiliary portion located between the right side wall of the first limiting portion and the left side wall of the second limiting portion; a limiting nut located on the left side of the first limiting portion is threadedly connected to the outside of the inner joint.

[0013] The right end of the inner joint is covered with a sealing ring fixed to the inner wall of the right end of the positioning sleeve, and the left end face of the rear axle output shaft fits with the right side wall of the sealing ring; the sealing ring is located on the right side of the clamping part; the outer wall of the right end of the positioning sleeve is provided with a number of limiting screw holes that are connected with its internal space; the outer wall of the sealing ring is provided with a number of limiting clamping holes corresponding to the positions of the limiting screw holes; an air inlet is provided at the center of the left end face of the inner joint; an air outlet is provided at the center of the right end face of the inner joint; the center of the bottom of the air inlet hole and the center of the bottom of the air outlet hole are connected through a vent; a limiting seat is threaded in the air outlet; a sealing ball blocks and seals the right end opening of the air outlet, and a sealing spring is provided between the sealing ball and the left end face of the limiting seat; a through hole is provided in the center of the limiting seat; a rotating groove is provided on the inner wall of the right end opening of the through hole.

[0014] The connector is provided with a plurality of slots evenly distributed in a circle; the left end face of the right clamp body is provided with a plurality of clamping blocks located in the slots; the right end face of the left clamp body is provided with a plurality of clamping plates located between the outer wall of the clamping block and the inner wall of the slot; the left end face of the clamping block is provided with a third through hole; the right end face of the right clamp body is provided with a third hidden slot intersecting with the third through hole, and the diameter of the third hidden slot is larger than the diameter of the third through hole; the right end face of the left clamp body is provided with a plurality of third screw holes coaxial with the third through hole; a fastening screw passes through the third through hole to the left and is screwed into the third screw hole, and the head of the fastening screw is pressed on the bottom of the third hidden slot.

[0015] The beneficial effects of the present invention are:

[0016] Compared with the prior art, the high-precision double-clamp hard turning fixture using the structure of the present invention can enable the outer clamp on the slider to clamp the right end of the rear axle output shaft through the outer clamping device, and enable the clamping claw to clamp the left end of the rear axle output shaft through the inner clamping device, so that the left and right ends of the rear axle output shaft are clamped and fixed at the same time, effectively avoiding the eccentricity caused by the centrifugal force generated by the rotation of the fixture when only one end of the rear axle output shaft is clamped, thereby effectively ensuring the machining accuracy of the inner holes at both ends of the rear axle output shaft and achieving high-precision machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the high-precision double-clamp hard turning fixture of the present invention;

[0018] Figure 2 yes Figure 1 An enlarged view of part A;

[0019] Figure 3 It is a structural schematic diagram of the high-precision double-clamp hard turning fixture of the present invention;

[0020] Figure 4 It is a schematic diagram of the structure when the positioning sleeve and the positioning ring are connected by a plurality of positioning arms evenly distributed on the circumference;

[0021] Figure 5 It is a schematic diagram of the structure of the gripper;

[0022] Figure 6 It is a stereoscopic diagram of the high-precision double-clamp hard turning fixture of the present invention;

[0023] Figure 7 It is a structural diagram of the rear axle output shaft. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] See also Figures 1 to 7The present invention provides a high-precision double-clamp hard turning fixture, comprising a right fixture body 1, a plurality of sliders 2 uniformly distributed in a circumference at the right end of the right fixture body 1, an outer clamp 3 is provided at the right inner end of the slider 2; a receiving hole 4 is provided at the center of the right fixture body 1, and a rear axle output shaft 5 is placed in the receiving hole 4; a left fixture body 6 is provided on the left side of the right fixture body 1; an outer clamping device is provided on the left fixture body 6, and the outer clamping device can control the movement of the slider 2 and clamp the plurality of sliders 2 at the right end bearing block of the rear axle output shaft 5; the left fixture body 6 is connected to the right fixture body 1 through a connecting body 7; a clamping seat 8 is provided at the center of the connecting body 7, and an inner clamping hole 9 which is connected with the receiving hole 4 is provided at the center of the clamping seat 8; an inner clamping device matching with it is provided in the left part of the inner clamping hole 9, and the inner clamping device is clamped at the left end bearing block of the rear axle output shaft 5.

[0026] The external clamping device comprises a right movable hole 10 arranged at the center of the right end face of the left clamp body 6, and a left movable hole 11 arranged at the center of the left end face of the left clamp body 6, the right end of the left movable hole 11 is connected with the center of the bottom of the right movable hole 10; a movable part 12 matching with it is arranged in the right movable hole 10; an external joint 13 is arranged at the center of the left end face of the movable part 12, and the left end of the external joint 13 passes through the left movable hole 11 to the left; a plurality of circumferentially evenly distributed ejecting holes 14 are arranged on the right clamp body 1; a plurality of fixed feet 15 corresponding to the positions of the ejecting holes 14 are arranged on the outer wall of the right end of the movable part 12; an ejecting column 16 fixed to the fixed foot 15 is arranged in the ejecting hole 14; the right clamp The right end face of the main body 1 is provided with a plurality of circumferentially evenly distributed slide grooves 17, and the slider 2 is located in the slide groove 17; the right end outer cover of the right clamp body 1 is provided with a limit cover 18, and the limit cover 18 limits the slider 2 in the slide groove 17 through its own left inner wall; the center of the limit cover 18 is provided with a feed port 19 that intersects with the accommodating hole 4; the slider 2 is provided with a guide slide hole 20, and the right end of the push column 16 is provided with a guide head 21 that matches the guide slide hole 20; the guide slide hole 20 is provided with a plurality of evenly distributed pressure inclined surfaces 22, and the right end of the pressure inclined surface 22 is inclined toward the center direction of the right clamp body 1; the outer wall of the guide head 21 is provided with a plurality of pressure inclined surfaces 23 that fit with the pressure inclined surface 22.

[0027] The fixing foot 15 is provided with a fixing hole 24 coaxial with the jacking hole 14; the center of the left end face of the jacking column 16 is provided with a first screw hole 25; a fixing screw 26 passes through the fixing hole 24 to the right and is screwed into the first screw hole 25, and the head of the fixing screw 26 fits against the left side wall of the fixing foot 15; the limit cover 18 is fixed to the right clamp body 1 by a number of evenly distributed limit screws 27.

[0028] The inner wall of the right end of the right movable hole 10 is provided with a plurality of notches 28 corresponding to the position of the fixed foot 15; an auxiliary hole 29 is provided on the inner wall on the left side of the notch 28; the left end surface of the left clamp body 6 is provided with a plurality of grooves 30 coaxial with the auxiliary hole 29; the center of the bottom of the groove 30 is connected with the center of the bottom of the auxiliary hole 29 through a first through hole 31; the left side wall of the head of the fixing screw 26 is provided with a pressure plate 32 fitted therewith; the center of the left side wall of the pressure plate 32 is provided with a telescopic rod 3 3; the left end of the telescopic rod 33 is inserted into the first through hole 31 to the left; a second screw hole 34 is provided at the center of the left end face of the telescopic rod 33; a ring gasket 35 is provided at the bottom of the groove 30 to fit therewith; a connecting screw 36 passes through the inner hole of the ring gasket 35 to the right and is screwed into the second screw hole 34, and the head of the connecting screw 36 fits the left side wall of the ring gasket 35; an auxiliary spring 37 is provided outside the telescopic rod 33 between the left side wall of the pressure plate 32 and the bottom of the auxiliary hole 29.

[0029] The outer wall of the jacking column 16 is provided with a spiral oil groove 38; the outer wall of the right clamp body 1 is provided with a plurality of oil injection holes 39 intersecting with the jacking hole 14; the outer end openings of the oil injection holes 39 are screwed with matching plugs 40.

[0030] The outer wall of the slider 2 is provided with a fine-tuning hole 41 intersecting with the guide sliding hole 20 , and the position of the fine-tuning hole 41 corresponds to the position of the pressure inclined surface 23 on the guide head 21 ; a fine-tuning screw 42 matching with it is threaded in the fine-tuning hole 41 .

[0031] The inner clamping device comprises a positioning sleeve 43 arranged in the left part of the inner clamping hole 9; the right side of the positioning sleeve 43 has a positioning ring 44 located in the inner clamping hole 9; the positioning sleeve 43 and the positioning ring 44 are connected by a plurality of positioning arms 45 evenly distributed around the circumference; the inner wall of the middle part of the inner clamping hole 9 is provided with an annular positioning step 46, and the left side wall of the positioning ring 44 is in contact with the positioning step 46; the outer wall of the left part of the rear axle output shaft 5 is provided with an annular positioning portion 502, and the left side wall of the positioning portion 502 is in contact with the right side wall of the positioning ring 44. Fit; a clamping claw sleeve 48 is provided between the outer wall of the positioning sleeve 43 and the inner wall of the inner clamping hole 9; a plurality of clamping claws 49 located between adjacent positioning arms 45 are provided on the right end face of the clamping claw sleeve 48; the clamping claws 49 are evenly distributed on the circumference outside the left end bearing block of the rear axle output shaft 5; an inner clamping cone surface 50 which is narrow on the left and wide on the right is provided on the inner wall of the inner clamping hole 9; an inner clamping oblique arc surface 51 matching the inner clamping cone surface 50 is provided on the outer wall of the right end of the clamping claw 49; a traction mechanism is provided in the external joint 13, and the traction mechanism can control the left and right movement of the clamping claw sleeve 48.

[0032] The traction mechanism includes an inner joint 52 arranged in the outer joint 13, and the inner joint 52 is coaxial with the outer joint 13; the inner wall of the left end of the inner clamping hole 9 is provided with a first limiting portion 53 in an annular shape; the inner wall of the clamping claw sleeve 48 is provided with a second limiting portion 54 in an annular shape; the inner wall of the left end of the positioning sleeve 43 is provided with a third limiting portion 55 in an annular shape; the right end of the inner joint 52 passes through the first limiting portion 53, the second limiting portion 54, and the third limiting portion 55 to the right in sequence and penetrates into the right end of the positioning sleeve 43; the inner joint The right outer wall of 52 is provided with a locking step 56 which fits with the right side wall of the second limiting portion 54; the right end outer wall of the inner joint 52 is provided with an annular locking portion 57; a pressure spring 58 which is sleeved on the outside of the inner joint 52 is provided between the left side wall of the locking portion 57 and the right side wall of the third limiting portion 55; the inner joint 52 is provided with an auxiliary portion 59 located between the right side wall of the first limiting portion 53 and the left side wall of the second limiting portion 54; the inner joint 52 is externally threaded with a limiting nut 60 located on the left side of the first limiting portion 53.

[0033] The right end of the inner joint 52 is covered with a sealing ring 61 fixed to the inner wall of the right end of the positioning sleeve 43, and the left end face of the rear axle output shaft 5 is in contact with the right side wall of the sealing ring 61; the sealing ring 61 is located on the right side of the clamping portion 57; the outer wall of the right end of the positioning sleeve 43 is provided with a plurality of limiting screw holes 62 that penetrate the internal space thereof; the outer wall of the sealing ring 61 is provided with a plurality of limiting clamping holes 63 corresponding to the positions of the limiting screw holes 62; the center of the left end face of the inner joint 52 is provided with an air inlet hole 64 An air outlet 65 is provided at the center of the right end face of the inner joint 52; the center of the bottom of the air inlet 64 is connected with the center of the bottom of the air outlet 65 through a vent hole 66; a limit seat 67 is threaded in the air outlet 65; a sealing ball 68 blocks and seals the right end opening of the air outlet 65, and a sealing spring 69 is provided between the sealing ball 68 and the left end face of the limit seat 67; a through hole 70 is provided at the center of the limit seat 67; a rotating groove 71 is provided on the inner wall of the right end opening of the through hole 70.

[0034] The connector 7 is provided with a plurality of slots 72 evenly distributed in a circle; the left end face of the right clamp body 1 is provided with a plurality of blocks 73 located in the slots 72; the right end face of the left clamp body 6 is provided with a plurality of clamp plates 74 located between the outer wall of the block 73 and the inner wall of the slot 72; the left end face of the block 73 is provided with a third through hole 75; the right end face of the right clamp body 1 is provided with a third hidden slot 76 intersecting with the third through hole 75, and the diameter of the third hidden slot 76 is larger than the diameter of the third through hole 75; the right end face of the left clamp body 6 is provided with a plurality of third screw holes 77 coaxial with the third through hole 75; a fastening screw 78 passes through the third through hole 75 to the left and is screwed into the third screw hole 77, and the head of the fastening screw 78 is pressed on the bottom of the third hidden slot 76.

[0035] The method of use of the present invention is as follows:

[0036] Both the external joint 13 and the internal joint 52 are connected to corresponding oil cylinders. The piston rod of the oil cylinder connected to the external joint 13 can be connected through the internal thread of the inner wall at the left end of the external joint 13, and the piston rod of the oil cylinder connected to the internal joint 52 can be connected through the external thread of the outer wall at the left end of the internal joint 52.

[0037] When the rear axle output shaft 5 needs to be clamped, the rear axle output shaft 5 can be fed into the accommodating hole 4 through the feed port in the center of the limit cover 18. As the rear axle output shaft 5 moves to the left, the left end face of the rear axle output shaft 5 finally fits against the right side wall of the sealing ring 61, and the left side wall of the positioning portion 502 of the rear axle output shaft 5 fits against the right side wall of the positioning ring 44. At this time, a number of clamping claws 49 are evenly distributed in a circle outside the left end bearing block of the rear axle output shaft 5, and a number of sliding blocks 2 are evenly distributed in a circle outside the right end bearing block of the rear axle output shaft 5. Since an external clamp 3 is provided on the right part of the inner end of the sliding block 2, the existence of the external clamp 3 can be clamped on the right end bearing block of the rear axle output shaft 5 under the action of the external clamping device, and the annular protrusion 501 on the rear axle output shaft 5 is accommodated in the accommodating hole 4.

[0038] When the right end bearing block of the rear axle output shaft 5 needs to be clamped, the outer joint 13 can be pulled to the left by the piston rod of the oil cylinder connected to the outer joint 13. When the outer joint 13 moves to the left, the movable part 12 will synchronously drive the jacking column 16 to move to the left along the trajectory of the jacking hole 14. When the jacking column 16 moves to the left, the guide head 21 arranged at the right end of the jacking column 16 moves to the left synchronously, and the outer wall of the guide head 21 is provided with a plurality of pressure inclined surfaces 23 that fit with the pressure inclined surfaces 22. The pressure inclined surfaces 22 and the pressure inclined surfaces 23 are in contact with each other. The right ends of the surfaces 23 are inclined toward the center of the right clamp body 1. Therefore, when the guide head 21 moves to the left, the left-moving pressure-applying inclined surface 23 will squeeze the pressure-receiving inclined surface 22 toward the center of the right clamp body 1. At this moment, the slider 2 will follow the trajectory of the slide groove 17 toward the center of the right clamp body 1, so that the outer clamp 3 approaches the outer wall of the bearing block at the right end of the rear axle output shaft 5, and finally presses tightly against the outer wall of the bearing block at the right end of the rear axle output shaft 5, completing the clamping work of the bearing block at the right end of the rear axle output shaft 5.

[0039] When the left end bearing block of the rear axle output shaft 5 needs to be clamped, the inner joint 52 can be pulled to the left by the piston rod of the oil cylinder connected to the inner joint 52. Since the second limiting portion 54 in the clamping claw sleeve 48 is limited between the positioning step 56 and the auxiliary portion 59, when the inner joint 52 moves to the left, the clamping claw sleeve 48 moves to the left synchronously, thereby realizing the left movement of the clamping claw 49, and the inner clamping oblique arc surface 51 of the outer wall of the right end of the clamping claw 49 fits with the inner clamping conical surface 50. Under the condition that it remains unchanged, when the clamping jaw 49 moves to the left, the inner clamping conical surface 50 will squeeze the inner clamping oblique arc surface toward the outer wall of the bearing block at the left end of the rear axle output shaft 5, and the clamping jaws 49 are evenly distributed on the circumference, and there is a gap between adjacent clamping jaws 49. Therefore, when the inner clamping oblique arc surface 51 is compressed, the clamping jaw 49 is deformed accordingly, and a number of clamping jaws 49 evenly distributed on the circumference are gathered and clamped on the outer wall of the bearing block at the left end of the rear axle output shaft 5, thereby completing the clamping work of the bearing block at the left end of the rear axle output shaft 5.

[0040] From the above, it can be known that the present invention can use the external clamping device to enable the external clamping head 3 on the slider 2 to clamp the bearing block at the right end of the rear axle output shaft 5, and can use the internal clamping device to enable the clamping claw 49 to clamp the bearing block at the left end of the rear axle output shaft 5, so that the left and right ends of the rear axle output shaft 5 are clamped and fixed at the same time, effectively avoiding the eccentricity caused by the centrifugal force generated by the rotation of the clamp when only one end of the rear axle output shaft 5 is clamped, thereby effectively ensuring the processing accuracy of the inner holes at both ends of the rear axle output shaft 5 and achieving high-precision processing.

[0041] A fixing hole 24 coaxial with the jacking hole 14 is provided on the fixing foot 15, and a first screw hole 25 is provided at the center of the left end surface of the jacking column 16. A fixing screw 26 passes through the fixing hole 24 to the right and is screwed into the first screw hole 25. The head of the fixing screw 26 fits against the left side wall of the fixing foot 15. This fixing method facilitates the disassembly and assembly between the jacking column 16 and the fixing foot 15, thereby facilitating the replacement of the jacking column 16.

[0042] The limiting cover 18 is fixed to the right clamp body 1 by a plurality of evenly distributed limiting screws 27 . This fixing method facilitates the disassembly and assembly of the limiting cover 18 , thereby facilitating the disassembly and assembly of the slider 2 .

[0043] A set of auxiliary springs 37 outside the telescopic rod 33 is provided between the left side wall of the pressure plate 32 and the bottom of the auxiliary hole 29. The existence of the auxiliary spring 37 can play the role of auxiliary support and effectively compensate for the gap. When the jacking column 16 is assembled, the elastic force of the auxiliary spring 37 can be used to push the jacking column 16 to the right, thereby effectively avoiding position deviation when several jacking columns 16 are installed and achieving a positioning effect. Finally, the compression of the auxiliary spring 37 can be fine-tuned by connecting the screws to fine-tune the position of the jacking column 16.

[0044] A spiral oil groove 38 is provided on the outer wall of the jacking column 16, and a plurality of oil filling holes 39 which are connected with the jacking hole 14 are provided on the outer wall of the right clamp body 1. The outer end opening of the oil filling hole 39 is screwed with a plug 40 which matches it. The oil groove 38 can be used to store lubricating oil. When the jacking column 16 moves along the inner wall trajectory of the jacking hole 14, the lubricating oil in the oil groove 38 will seep into the gap between the inner wall of the jacking hole 14 and the outer wall of the jacking column 16, thereby playing a lubricating effect, ensuring the smoothness of the movement of the jacking column 16, and at the same time playing an anti-wear effect. If lubricating oil needs to be added to the oil groove 38, it is only necessary to unscrew the plug from the outer end opening of the oil filling hole 39, and then use the oil filling hole 39 to fill oil into the gap between the outer wall of the jacking column 16 and the inner wall of the jacking hole 14, and the lubricating oil will eventually enter the oil groove 38.

[0045] The outer wall of the slider 2 is provided with a fine-tuning hole 41 which is connected with the guide slide hole 20. The position of the fine-tuning hole 41 corresponds to the position of the pressure inclined surface 23 on the guide head 21. A fine-tuning screw 42 matching with it is threaded in the fine-tuning hole 41. The existence of the fine-tuning screw 42 can achieve the effect of eccentricity compensation. If there is a position deviation of several sliders 2 uniformly distributed on the circumference, the fine-tuning screw 42 can be rotated. Through the displacement of the fine-tuning screw 42, the inner end of the fine-tuning screw 42 is pressed against the pressure inclined surface 23 of the guide head, so that the slider 2 is pushed and displaced in the opposite direction, thereby effectively changing the position of the slider 2. Finally, the positions of all sliders 2 are adjusted to be consistent, effectively ensuring the clamping effect of the outer chuck 3.

[0046] The right end of the inner joint 52 is covered with a sealing ring 61 fixed to the inner wall of the right end of the positioning sleeve 43, the left end face of the rear axle output shaft 5 is fitted with the right side wall of the sealing ring 61, and the sealing ring 61 is located on the right side of the locking portion 57. An air inlet 64 is provided in the center of the left end face of the inner joint 52, and an air outlet 65 is provided in the center of the right end face of the inner joint 52. The center of the bottom of the air inlet 64 and the center of the bottom of the air outlet 65 are connected through a vent 66. A limit seat 67 is screwed in the air outlet 65, and a sealing ball 68 blocks and seals the right end of the air outlet 65. A sealing spring 69 is provided between the sealing ball 68 and the left end face of the limit seat 67, and a through hole 70 is provided in the center of the limit seat 67. The sealing ring 61 can cover and seal the left end of the rear axle output shaft 5 through its own right side wall, so that the debris generated when the tool extends into the rear axle output shaft 5 to perform inner hole processing cannot pass. The debris is thrown into the inner clamping hole 9 through the left end hole of the rear axle output shaft 5, thereby avoiding the situation that the debris in the inner clamping hole 9 affects the normal movement of the clamping claw sleeve 48, and effectively ensuring the clamping effect of the clamping claw. When the sealing ball 68 blocks the right end hole of the air vent 66, even if some debris enters the air outlet 65, it cannot enter the air inlet 64, and the left end hole of the air inlet 64 of the internal joint 52 can be connected to the air pipe. When the rear axle output shaft 5 is processed, high-pressure gas can be blown into the air inlet 64, and then the sealing ball 68 is pushed to the right to enter the air outlet 65, and finally enters the rear axle output shaft 5 through the through hole 70 and the right end hole of the air outlet 65 in turn, and the debris is blown out from the right end hole of the rear axle output shaft 5 to the outside, completing the internal cleaning, and finally loosening the two ends of the rear axle output shaft 5, and the rear axle output shaft 5 can be unloaded.

[0047] The outer wall of the right end of the positioning sleeve 43 is provided with a plurality of limiting screw holes 62 which are connected with its internal space, and the outer wall of the sealing ring 61 is provided with a plurality of limiting clamping holes 63 which correspond to the positions of the limiting screw holes 62. The positioning sleeve 43 and the sealing ring 61 can be fixed by simply screwing the screw into the limiting screw hole and clamping one end of the screw in the limiting clamping hole.

[0048] A rotation groove 71 is provided on the inner wall of the right end of the through hole 70 . The rotation groove 71 can be adapted to one end of an inner hexagonal wrench. The inner hexagonal wrench can be used to quickly rotate the limit seat 67 , thereby realizing rapid disassembly and assembly of the limit seat 67 .

[0049] The connector 7 is provided with a plurality of slots 72 evenly distributed in a circumference, the left end surface of the right clamp body 1 is provided with a plurality of blocks 73 located in the slots 72, the right end surface of the left clamp body 6 is provided with a plurality of clamping plates 74 located between the outer wall of the block 73 and the inner wall of the slot 72, the left end surface of the block is provided with a third through hole 75, the right end surface of the right clamp body 1 is provided with a third hidden slot 76 intersecting the third through hole 75, the diameter of the third hidden slot 76 is larger than the diameter of the third through hole 75, the right end surface of the left clamp body 6 is provided with a plurality of third screw holes 77 coaxial with the third through hole 75; a fastening screw 78 passes through the third through hole to the left 75 is screwed into the third screw hole 77, and the head of the fastening screw 78 is pressed against the bottom of the third hidden groove 76. This fixing method can not only realize the rapid assembly of the left clamp body 6 and the right clamp body 1, but also ensure the stability between the two. At the same time, a number of circumferentially evenly distributed positioning pins 79 can be set on the connecting body 7, and then a number of positioning holes 80 matching the positioning pins 79 can be set on the right end face of the left clamp body 6. The assembly between the connecting body 7 and the left clamp body 6 is first realized by utilizing the cooperation between the positioning pins 79 and the positioning holes 80, thereby facilitating the rapid assembly of the right clamp body 1.

[0050] In order to prevent the left side wall of the movable part from directly colliding with the bottom of the right movable hole 10 when the external joint 13 pulls the movable part 12 to the left, a plurality of spring grooves 81 evenly distributed in a circumference can be provided on the left side wall of the movable part 12, a plurality of positioning slide holes 82 intersecting the center of the bottom of the spring groove 81 can be provided on the right side wall of the movable part 12, a positioning slide rod 83 matching the positioning slide hole 82 is provided in the positioning slide hole 82, a fourth screw hole 84 is provided at the center of the left end face of the positioning slide rod 83, and a plurality of spring grooves 81 intersecting the spring groove 81 can be provided on the left side wall of the movable part 12. The fifth screw hole 85 is connected to the fourth screw hole 84 and the fifth screw hole 85 at the same time. The head of the fourth screw 86 fits with the left end face of the left clamp body 6. A buffer spring 87 is provided between the bottom of the right movable hole 10 and the bottom of the spring groove 81 and is sleeved on the outside of the positioning slide rod 83. When the movable part 12 moves to the left, the buffer spring 87 is compressed and generates elastic force, which can effectively play a buffering role and effectively avoid the situation where the left side wall of the movable part 12 directly collides with the bottom of the right movable hole 10, causing wear of both.

Claims

1. A high-precision double-clamp hard turning fixture, comprising a right fixture body, and a plurality of sliders evenly distributed in a circumference at the right end of the right fixture body, characterized in that: An external clamp is provided at the right part of the inner end of the slider; a receiving hole is provided at the center of the right clamp body, and a rear axle output shaft is placed in the receiving hole; a left clamp body is provided on the left side of the right clamp body; an external clamping device is provided on the left clamp body, and the external clamping device can control the movement of the slider and clamp a plurality of sliders at the right end of the rear axle output shaft; the left clamp body is connected to the right clamp body through a connecting body; a clamping seat is provided at the center of the connecting body, and an internal clamping hole that penetrates the receiving hole is provided at the center of the clamping seat; an internal clamping device matching with it is provided in the left part of the internal clamping hole, and the internal clamping device is clamped at the left end of the rear axle output shaft.

2. A high-precision double-clamp hard turning fixture according to claim 1, characterized in that: The external clamping device comprises a right movable hole arranged at the center of the right end surface of the left clamp body, and a left movable hole arranged at the center of the left end surface of the left clamp body, the right end of the left movable hole is connected with the center of the bottom of the right movable hole; a movable part matching with it is arranged in the right movable hole; an external joint is arranged at the center of the left end surface of the movable part, and the left end of the external joint passes through the left movable hole to the left; a plurality of jacking holes evenly distributed in a circle are arranged on the right clamp body; a plurality of fixed feet corresponding to the positions of the jacking holes are arranged on the outer wall of the right end of the movable part; a jacking column fixed with the fixed feet is arranged in the jacking hole; the right The right end face of the clamp body is provided with a plurality of slide grooves evenly distributed in a circle, and the slider is located in the slide groove; the right end outer cover of the right clamp body is provided with a limit cover, and the limit cover limits the slider in the slide groove through its own left inner wall; the center of the limit cover is provided with a feed port which is connected with the accommodating hole; the slider is provided with a guide slide hole, and the right end of the push column is provided with a guide head which matches the guide slide hole; the guide slide hole is provided with a plurality of evenly distributed pressure inclined surfaces, and the right end of the pressure inclined surface is inclined toward the center direction of the right clamp body; the outer wall of the guide head is provided with a plurality of pressure inclined surfaces which fit with the pressure inclined surface.

3. A high-precision double-clamp hard turning fixture according to claim 2, characterized in that: The fixing foot is provided with a fixing hole coaxial with the jacking hole; the center of the left end face of the jacking column is provided with a first screw hole; a fixing screw passes through the fixing hole to the right and is screwed into the first screw hole, and the head of the fixing screw fits against the left side wall of the fixing foot; the limit cover and the right clamp body are fixed by a number of evenly distributed limit screws.

4. A high-precision double-clamp hard turning fixture according to claim 3, characterized in that: The inner wall of the right end opening of the right movable hole is provided with a plurality of notches corresponding to the positions of the fixed feet; an auxiliary hole is provided on the inner wall on the left side of the notch; a plurality of grooves coaxial with the auxiliary hole are provided on the left end face of the left clamp body; the center of the bottom of the groove and the center of the bottom of the auxiliary hole are connected through the first through hole; a pressure plate is provided on the left side wall of the head of the fixing screw; a telescopic rod is provided at the center of the left side wall of the pressure plate; the left end of the telescopic rod is inserted into the first through hole to the left; a second screw hole is provided at the center of the left end face of the telescopic rod; an annular gasket is provided at the bottom of the groove to fit therewith; a connecting screw passes through the inner hole of the annular gasket to the right and is screwed into the second screw hole, and the head of the connecting screw fits with the left side wall of the annular gasket; an auxiliary spring outside the telescopic rod is provided between the left side wall of the pressure plate and the bottom of the auxiliary hole.

5. A high-precision double-clamp hard turning fixture according to claim 2, characterized in that: The outer wall of the jacking column is provided with a spiral oil groove; the outer wall of the right clamp body is provided with a plurality of oil injection holes which are connected with the jacking holes; the outer end openings of the oil injection holes are screwed with plugs which match them.

6. A high-precision double-clamp hard turning fixture according to claim 2, characterized in that: The outer wall of the sliding block is provided with a fine-tuning hole intersecting with the guide sliding hole, and the position of the fine-tuning hole corresponds to the position of the pressure inclined surface on the guide head; a fine-tuning screw matching with the fine-tuning hole is threaded in the fine-tuning hole.

7. A high-precision double-clamp hard turning fixture according to claim 1, characterized in that: The inner clamping device includes a positioning sleeve arranged in the left part of the inner clamping hole; the right side of the positioning sleeve has a positioning ring located in the inner clamping hole; the positioning sleeve and the positioning ring are connected by a number of positioning arms evenly distributed in a circle; the inner wall of the middle part of the inner clamping hole is provided with an annular positioning step, and the left side wall of the positioning ring fits with the positioning step; the outer wall of the left part of the rear axle output shaft is provided with an annular positioning part, and the left side wall of the positioning part fits with the right side wall of the positioning ring; a clamping claw sleeve is provided between the outer wall of the positioning sleeve and the inner wall of the inner clamping hole; the right end face of the clamping claw sleeve is provided with a number of clamping claws located between adjacent positioning arms; the clamping claws are evenly distributed in a circle outside the left end of the rear axle output shaft; the inner wall of the inner clamping hole is provided with an inner clamping cone surface that is narrow on the left and wide on the right; the outer wall of the right end of the clamping claw is provided with an inner clamping oblique arc surface that matches the inner clamping cone surface; a traction mechanism is provided in the external joint, and the traction mechanism can control the left and right movement of the clamping claw sleeve.

8. A high-precision double-clamp hard turning fixture according to claim 7, characterized in that: The traction mechanism includes an inner joint arranged in the outer joint, and the inner joint is coaxial with the outer joint; the inner wall of the left end hole of the inner clamping hole is provided with a first limiting portion in an annular shape; the inner wall of the clamping jaw sleeve is provided with a second limiting portion in an annular shape; the inner wall of the left end port of the positioning sleeve is provided with a third limiting portion in an annular shape; the right end of the inner joint passes through the first limiting portion, the second limiting portion, and the third limiting portion in sequence to the right and penetrates into the right end port of the positioning sleeve; the outer wall of the right part of the inner joint is provided with a locking step that fits with the right side wall of the second limiting portion; the outer wall of the right end of the inner joint is provided with an annular locking portion; a pressure spring that is sleeved on the outside of the inner joint is provided between the left side wall of the locking portion and the right side wall of the third limiting portion; the inner joint is provided with an auxiliary portion located between the right side wall of the first limiting portion and the left side wall of the second limiting portion; a limiting nut located on the left side of the first limiting portion is threadedly connected to the outside of the inner joint.

9. A high-precision double-clamp hard turning fixture according to claim 8, characterized in that: The right end of the inner joint is covered with a sealing ring fixed to the inner wall of the right end of the positioning sleeve, and the left end face of the rear axle output shaft fits with the right side wall of the sealing ring; the sealing ring is located on the right side of the clamping part; the outer wall of the right end of the positioning sleeve is provided with a number of limiting screw holes that are connected with its internal space; the outer wall of the sealing ring is provided with a number of limiting clamping holes corresponding to the positions of the limiting screw holes; an air inlet is provided at the center of the left end face of the inner joint; an air outlet is provided at the center of the right end face of the inner joint; the center of the bottom of the air inlet hole and the center of the bottom of the air outlet hole are connected through a vent; a limiting seat is threaded in the air outlet; a sealing ball blocks and seals the right end opening of the air outlet, and a sealing spring is provided between the sealing ball and the left end face of the limiting seat; a through hole is provided in the center of the limiting seat; a rotating groove is provided on the inner wall of the right end opening of the through hole.

10. A high-precision double-clamp hard turning fixture according to claim 1, characterized in that: The connector is provided with a plurality of slots evenly distributed in a circle; the left end face of the right clamp body is provided with a plurality of clamping blocks located in the slots; the right end face of the left clamp body is provided with a plurality of clamping plates located between the outer wall of the clamping block and the inner wall of the slot; the left end face of the clamping block is provided with a third through hole; the right end face of the right clamp body is provided with a third hidden slot intersecting with the third through hole, and the diameter of the third hidden slot is larger than the diameter of the third through hole; the right end face of the left clamp body is provided with a plurality of third screw holes coaxial with the third through hole; a fastening screw passes through the third through hole to the left and is screwed into the third screw hole, and the head of the fastening screw is pressed on the bottom of the third hidden slot.

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