CN207071728U - Passenger car rack and pinion steering gear rack rollers high-efficiency precise hydraulic fixture - Google Patents

Abstract

Passenger car rack and pinion steering gear rack rollers high-efficiency precise hydraulic fixture is related to metal cutting process field of fixtures.The hydraulically operated fixture includes clamp bottom board 1, chuck body 2, liquid presses piston pole 3, cylinder body bottom 4, briquetting connecting rod 5, right shoulder block 6, pressing plate 7, workpiece support 8, universal joint connection ring 9, left shoulder block 10, oil-hole screw plug 11, oil connection 12, limiting plate 13, locating piece 14, base alignment pin 15, both sides oilhole screw plug 16, platen positioning key 17, workpiece holder 18.The utility model is that the rack that the hydraulic system of digital control system control clamps is ground one-shot forming fixture, compact-sized, dependable performance, chucking power is strong, accurate positioning, and it is convenient to change production, high in machining efficiency, high-efficiency and precision meets passenger car rack and pinion steering gear rack grinding technique quality requirement.The utility model can be widely popularized the manufacturing enterprise for applying to each vehicle rack tooth Profile Machining of passenger car rack and pinion steering gear.

Description

Passenger car rack and pinion steering gear rack rollers high-efficiency precise hydraulic fixture

Technical field

Metal cutting process fixture is the utility model is related to, especially a kind of passenger car rack and pinion steering gear rack grinding High-efficiency and precision hydraulically operated fixture.

Background technology

Rack Precision Machining has gear shaping, mill teeth, gear hobbing, drawing tooth, wire cutting, roll flute etc., in passenger car parts production industry Produce the rack of rack and pinion steering gear, mainly hobbing, the drawing technique such as tooth and roll flute in enormous quantities.However, hobbing rack and drawing Rack requires very high to the precision of cutter, sharpening, and the cost of charp tool is also very high, and efficiency is medium.At present, it is ground using overall time Forming technology is more universal.Therefore, the applicant have developed a kind of passenger car rack and pinion steering gear rack rollers high-efficiency it is accurate, The rack clamp that the hydraulic system of digital control system control clamps.This rack grinding hydraulic pressure clamp structure is compact, dependable performance, Chucking power is strong, accurate positioning, changes production conveniently, high in machining efficiency, meets passenger car rack and pinion steering gear rack grinding technique matter Amount requires that overall economic efficiency is notable.

Through retrieval, it is domestic there has been no with the utility model identical patent application.

The content of the invention

For described above, the utility model offer is a kind of compact-sized, and dependable performance, chucking power is strong, accurate positioning, changes Production is convenient, high in machining efficiency, meets passenger car rack and pinion steering gear rack grinding technique quality requirement, digital control system control Hydraulic system clamp rack clamp-passenger car rack and pinion steering gear rack rollers high-efficiency precise hydraulic fixture.

Technical scheme is used by the utility model solves its technical problem：The passenger car rack and pinion steering gear rack Rollers high-efficiency precise hydraulic fixture includes:Clamp bottom board 1, chuck body 2, liquid presses piston pole 3, cylinder body bottom 4, briquetting connecting rod 5th, right shoulder block 6, pressing plate 7, workpiece support 8, universal joint connection ring 9, left shoulder block 10, oil-hole screw plug 11, oil connection 12, Limiting plate 13, locating piece 14, base alignment pin 15, both sides oilhole screw plug 16, platen positioning key 17, workpiece support Frame 18, described clamp bottom board 1 are cuboid bottom plate, respectively make a semicircle open slot at the elongated center line both ends of cuboid, The lower plane of clamp bottom board 1, on the elongated center line of cuboid, respectively on the inside of both ends open groove successively to being referred to as socket cap The screwed hole of soket head cap screw, standard thread through hole, the alignment pin through hole of base alignment pin 15 and lead to from both ends to alignment pin Make rectangular keyway at hole, its keyway groove width and the cuboid small end of platen positioning key 17 coordinate, and are worked by lathe Platform positioning key 17 and socket cap screw are fastenedly connected clamp bottom board 1 and platen T-shaped keyway, are positioned by base Pin 15 is accurately positioned clamp bottom board 1 and chuck body 2；Described chuck body 2 is ladder cuboid, in rectangular body length The step edges at heart line both ends make the alignment pin through hole of semicircle open slot and base alignment pin 15, by two standard hex respectively Bolt is each passed through the semicircle open slot of chuck body 2 and is connected with the standard thread through hole on clamp bottom board 1, clamp bottom board 1 is fastenedly connected integrally with chuck body 2, along the length direction of chuck body 2, makees three through holes up and down, uppermost hole is row Let out hole 22, seven porus excretoriuses vertically downward that the porus excretorius is made with plane in chuck body 2 communicate, discharging cutting fluid And abrasive dust, following two holes be hydraulic circuit through hole, the fit sealing of oil circuit left end oil-hole screw plug 11, oil circuit right-hand member by Oil connection 12 connects with oil pipe 20 and oil pipe 21 respectively, vertically makees front two rows, every in the upper plane of the cuboid of chuck body 2 Arrange eight oil har openings, each oil har opening up and down two chambers make respectively oilhole with along the length direction of chuck body 2, two hydraulic pressure made up and down Oil circuit is vertical and connects, and makees each oilhole left and right ends and all uses the fit sealing of both sides oilhole screw plug 16, is installed in oil har opening Liquid presses piston pole 3, changing hydraulic oil direction can promote liquid presses piston pole 3 to move up and down, and oil har opening upper end makees have seal groove, to Load seal, oil har opening lower end installation cylinder body bottom 4, two groups of mounting screw holes of plane left end and right-hand member in chuck body 2 Fixed left shoulder block 10 and right shoulder block 6 are installed respectively with dowel hole, middle multigroup mounting screw holes and dowel hole installation are fixed Workpiece support 8；Described liquid presses piston pole 3 is multi-step cylinder, and small end cylindrical end face makees internal thread hole to ten thousand Connected to section connection ring 9, middle maximum excircle part is piston, its piston external diameter and oil har opening internal diameter snug sliding fit, is lived Make seal groove beyond the Great Wall and load O-ring seal；Described cylinder body bottom 4 is two step cylinders, makees a sealing on small cylinder Groove loads O-ring seal, and big cylindrical end face makees 4 socket cap screw holes, by soket head cap screw cylinder body bottom 4 with The oil har opening of chuck body 2 is fixedly connected；Described briquetting connecting rod 5 is thin cylindrical bar, and its one end makees have screwed hole to be easy to fill Tear open, pressing plate 7 and universal joint connection ring 9 are connected by briquetting connecting rod 5；Described right shoulder block 6 is inverted T shaped cuboid, its underpart Make have hexad socket cap screw hole and two dowel holes on cuboid, by socket cap screw and positioning Pin right shoulder block 6 and the right-hand member precise positioning of chuck body 2 and fastening, on the cuboid of its underpart on the right side of also work have one group of R arc groove, with Piston rod 3 is avoided, makees two imitative works respectively along at left and right sides of the right length direction of shoulder block 6 above the cuboid on the right top of shoulder block 6 The outer convex globoidal of part diameter, to be contacted with the inner concave arc surface of pressing plate 7 bear pressure；Described pressing plate 7 is similar inverted T shaped rectangular The parallel prismatic of body is the pressing plate of main body, and the angle of its prismatic is the lead angle of the tooth form of workpiece 19, and the bottom of pressing plate 7 is similar The parallel prismatic panel of cuboid plate, make the imitative diameter circular arc body of workpiece 19 in its two side, contacted with workpiece 19 or with right shoulder block 6, The top of pressing plate 7 is similar to work has circular hole and length direction in one to hang down along the length direction of pressing plate 7 above the parallel edge body of cuboid Nogata has two square holes to work, to through briquetting connecting rod 5 and universal joint connection ring 9；Described workpiece support 8 is inverted T shaped Cuboid, make have hexad socket cap screw hole and two dowel holes on the cuboid of its underpart, by socket cap Hex screw and alignment pin are workpiece support 8 and the precise positioning of chuck body 2 and fastening, the left and right sides on the cuboid of its underpart Also make there are two groups of R arc grooves, to avoid piston rod 3, along the length of workpiece support 8 above the cuboid on the top of workpiece support 8 The semicircle cambered surface for having an imitative diameter of work is made in direction, and to support workpiece 19, workpiece 19 is the quenched elongated pole refined Material, semi arch make have six grooves vertical with the bottom surface of support base 8 and six holes downwards, as porus excretorius, discharge cutting fluid and mill Bits, this porus excretorius communicate with the porus excretorius 22 in chuck body 2；Make on its lower end cylinder of described universal joint connection ring 9 outer Screw thread is connected with the internal thread of the termination of liquid presses piston pole 3, and its upper end is outer shroud and mobilizable inner ring, passes through briquetting connecting rod 5 Universal joint connection ring 9 is set to be connected with pressing plate 7；Described left shoulder block 10 is inverted T shaped cuboid, makees have one group on the cuboid of its underpart Six socket cap screw holes and two dowel holes, by socket cap screw and alignment pin left shoulder block 10 and folder Having the left end precise positioning of body 2 and fastening, its underpart cuboid upper left side also makees have one group of R arc groove, to avoid piston rod 3, Make the evagination of two imitative diameters of work above the cuboid on the left top of shoulder block 10 respectively along at left and right sides of the left length direction of shoulder block 10 Cambered surface, to be contacted with the inner concave arc surface of pressing plate 7 bear pressure；Described oilhole screw plug 11 and the left end oilhole of chuck body 2 Screw threads for fastening connects；Described two of oil connection 12 is external pipe thread, and centre is hexahedron, and endoporus is oil-through-hole, and oil pipe connects First 12 1 are connected with the right-hand member oil circuit port internal thread of chuck body 2, and other end connects with hydraulic station oil pipe 20 and oil pipe 21 respectively Mouth connection；Described limiting plate 13 is cuboid, and cuboid bottom surface makees have hexagonal in one group of five socket cap along its length Screw hole, limiting plate 13 is fixed on the left side of chuck body 2 top concave station by socket cap screw, on limiting plate 13 Plane, one group of seven rectangular slot is done along its length, to install locating piece 14, make in the bottom surface of each rectangular slot Corresponding socket cap screw hole, to be fixedly connected with locating piece 14；Described locating piece 14 is small cuboid, its small length Cube front makees have two screwed holes, and locating piece 14 is fixedly connected with limiting plate 13 by soket head cap screw, and it is limitation that it, which is acted on, The axial location of workpiece 19, realize 19 axial precise positioning of workpiece；Described alignment pin 15 is taper bolt, and its effect is to make fixture Bottom plate 1 and chuck body 2 install precise positioning；Described both sides oilhole screw plug 16, with the both sides oil circuit screw thread of chuck body 2 Connection, its effect is to block the both sides oil circuit of chuck body 2 to prevent oil leak；Described platen positioning key 17 is that T-shaped is rectangular Body, make socket cap screw hole on T-shaped cuboid, pass through the small end of positioning key 17 and the elongated key at both ends on clamp bottom board 1 Groove coordinates, and is fastenedly connected with the screwed hole of socket cap screw and the bottom surface of clamp bottom board 1, the big end of positioning key 17 and machine T-slot on bed workbench precisely coordinates, to reduce the time of calibration clamp；Described workpiece holder 18 is triangular support Frame is fixedly connected by soket head cap screw with the right side of chuck body 2, supports the tail end of workpiece 19, makes workpiece steady on fixture.

The beneficial effects of the utility model are：

The utility model passenger car rack and pinion steering gear rack rollers high-efficiency precise hydraulic clamp structure is compact, and performance can Lean on, chucking power is strong, accurate positioning, changes production conveniently, high in machining efficiency, meets passenger car rack and pinion steering gear rack grinding technique Quality requirement, overall economic efficiency are notable.

The utility model can be widely popularized the life for applying to each vehicle rack tooth Profile Machining of passenger car rack and pinion steering gear Produce enterprise.

Brief description of the drawings

Fig. 1 is overall structure diagram of the present utility model.Fig. 2 is Fig. 1 left view.

Fig. 3 is the front view of clamp bottom board structural representation of the present utility model.Fig. 4 is Fig. 3 top view.Fig. 5 is Fig. 3 Left view.

Fig. 6 is the front view of chuck body structural representation of the present utility model.Fig. 7 is Fig. 6 top view.Fig. 8 is Fig. 7 A-A sectional views.Fig. 9 is Fig. 7 B-B sectional views.

Figure 10 is the front view of fixture liquid presses piston pole structural representation of the present utility model.Figure 11 is Figure 10 left view Figure.

Figure 12 is the front view of cylinder body bottom cover structure schematic of the present utility model.Figure 13 is Figure 12 left view.

Figure 14 is briquetting connecting rod structural representation of the present utility model.

Figure 15 is the front view of right shoulder block structural representation of the present utility model.Figure 16 is Figure 15 top view.Figure 17 is Figure 15 left view.

Figure 18 is the front view of pressure plate structure schematic diagram of the present utility model.Figure 19 is Figure 18 top view.Figure 20 is figure 18 left view.

Figure 21 is the front view of workpiece support structural representation of the present utility model.Figure 22 is Figure 21 top view.Figure 23 be Figure 21 left view.

Figure 24 is the front view of universal joint connection ring structure schematic diagram of the present utility model.Figure 25 is Figure 24 left view.

Figure 26 is the front view of left shoulder block structural representation of the present utility model.Figure 27 is Figure 26 top view.Figure 28 is Figure 26 left view.

Figure 29 is the front view of oil connection structural representation of the present utility model.Figure 30 is Figure 29 left view.

Figure 31 is the front view of spacing plate structure schematic diagram of the present utility model.Figure 32 is Figure 31 C-C sectional views.

Figure 33 is the front view of positioning block structure schematic diagram of the present utility model.Figure 34 is Figure 33 top view.Figure 35 is Figure 33 left view.

Figure 36 is the front view of platen positioning key structure schematic diagram of the present utility model.Figure 37 is Figure 36 left view Figure.

Embodiment

Using drawings and examples, the utility model is described in further detail.

As shown in Fig. 1-Figure 37, the utility model passenger car rack and pinion steering gear rack rollers high-efficiency precise hydraulic folder Tool includes:Clamp bottom board 1, chuck body 2, fixture liquid presses piston pole 3, cylinder body bottom 4, briquetting connecting rod 5, right shoulder block 6, pressing plate 7th, workpiece support 8, universal joint connection ring 9, left shoulder block 10, oil-hole screw plug 11, oil connection 12, limiting plate 13, positioning Block 14, base alignment pin 15, both sides oilhole screw plug 16 and platen positioning key 17, workpiece holder 18；This practicality During new installation, first clamp bottom board 1 and lathe are worked with T-shaped platen positioning key 17 and socket cap screw The T-shaped keyway of platform is fastenedly connected；Seal is fitted into the seal groove of oil har opening upper end, fixture liquid presses piston pole 3 loaded each In oil har opening, load cylinder body bottom 4 in oil har opening lower end, by soket head cap screw cylinder body bottom 4 and the oil har opening of chuck body 2 It is fixedly connected, the external screw thread of the lower end of universal joint connection ring 9 is fixedly connected with the internal thread of fixture liquid presses piston pole 3；Again with circle The base alignment pin 15 of taper and standard hex bolts are chuck body 2 and the precise positioning of clamp bottom board 1 and are fastenedly connected into one Body；Load limiting plate 13 in the concave station of the left side upper end of chuck body 2, it is fixed in one group of seven rectangular slot of limiting plate 13 Seven locating pieces 14；Plane is according to every group of six soket head cap screw holes and two dowel hole precise positionings in chuck body 2 Left shoulder block 10,7 workpiece supports 8, right shoulder blocks 6 are installed with fastening；The quenched elongated pole material refined --- workpiece 19 It is supported in the semicircle cambered surface of workpiece support 8, pressing plate 7 is loaded onto successively in the top of workpiece 19, finally with briquetting connecting rod 5 Two universal joint connection rings 9 are connected, then workpiece 19 are fixed in chuck body 2；Workpiece is fixedly mounted on the right side of chuck body 2 Support frame 18；Then the utility model assembling is completed.

Utility model works process：Workpiece 19 is placed into workpiece support 8, workpiece 19 axially has the essence of locating piece 14 Certainly position, radially there are workpiece support 8R arc precise positionings, operating numerical control system presses clamp key, and hydraulic oil enters oil through hydraulic fluid port 20 Cylinder epicoele promotes liquid presses piston pole 3 to mobile, the universal joint connection ring for driving the threaded upper ends of liquid presses piston pole 3 to connect below oil cylinder 9 move down with the briquetting connecting rod 5 passed through, with dynamic pressure plate 7, so as to clamp workpiece 19；After machining, by numerical control system System reverse keys, the hydraulic oil of hydraulic system enter oil cylinder cavity of resorption through hydraulic fluid port 21, promote liquid presses piston pole 3 to run up, band dynamic pressure Plate 7 moves up, and unclamps workpiece 19.The utility model, which changes production, to be coordinated by positioning key 17 and platen locating slot, Realize that fast accurate positions.The utility model is compact-sized, and dependable performance, chucking power is strong, accurate positioning, changes production conveniently, is one Kind high efficiency, the fixture of rack teeth machining high-precision requirement can be met.

The utility model can be widely popularized the life for applying to each vehicle rack tooth Profile Machining of passenger car rack and pinion steering gear Produce enterprise.

Claims (1)

1. A kind of 1. passenger car rack and pinion steering gear rack rollers high-efficiency precise hydraulic fixture, it is characterised in that：The riding skiving Wheel rack steering gear rack rollers high-efficiency precise hydraulic fixture includes:Clamp bottom board (1), chuck body (2), liquid presses piston pole (3), cylinder body bottom (4), briquetting connecting rod (5), right shoulder block (6), pressing plate (7), workpiece support (8), universal joint connection ring (9), left shoulder block (10), oil-hole screw plug (11), oil connection (12), limiting plate (13), locating piece (14), base alignment pin (15), both sides oilhole screw plug (16), platen positioning key (17), workpiece holder (18), described clamp bottom board (1) it is cuboid bottom plate, respectively makees a semicircle open slot at the elongated center line both ends of cuboid, put down under clamp bottom board (1) Face, on the elongated center line of cuboid, respectively on the inside of both ends open groove successively to being referred to as the screw thread of socket cap screw Hole, standard thread through hole, the alignment pin through hole of base alignment pin (15), and make from both ends to alignment pin through hole rectangular Keyway, its keyway groove width and the cuboid small end of platen positioning key (17) coordinate, by platen positioning key (17) Clamp bottom board (1) and platen T-shaped keyway are fastenedly connected with socket cap screw, by base alignment pin (15) Clamp bottom board (1) is accurately positioned with chuck body (2)；Described chuck body (2) is ladder cuboid, in rectangular body length The step edges at heart line both ends make the alignment pin through hole of semicircle open slot and base alignment pin (15), by two standards six respectively The semicircle open slot that corner bolt is each passed through chuck body (2) is connected with the standard thread through hole on clamp bottom board (1), folder Tool bottom plate (1) is fastenedly connected integrally with chuck body (2), along chuck body (2) length direction, makees three through holes up and down, most Hole above is porus excretorius (22), the porus excretorius and plane is made in chuck body (2) seven porus excretorius phases vertically downward Lead to, to discharge cutting fluid and abrasive dust, two holes below are hydraulic circuit through hole, oil circuit left end oil-hole screw plug (11) Fit sealing, oil circuit right-hand member are connected with oil pipe (20) and oil pipe (21) respectively by oil connection (12), rectangular in chuck body (2) The upper plane of body vertically makees front two rows, often arranges eight oil har openings, each oil har opening up and down two chambers make respectively oilhole with along fixture sheet Body (2) length direction, two hydraulic circuits made up and down are vertical and connect, and make each oilhole left and right ends and all use both sides oilhole spiral shell Line plug (16) fit sealing, liquid presses piston pole (3) is installed in oil har opening, liquid presses piston pole can be promoted by changing hydraulic oil direction (3) move up and down, oil har opening upper end makees have seal groove, to load seal, oil har opening lower end installation cylinder body bottom (4), folder The two groups of mounting screw holes and dowel hole of plane left end and right-hand member install fixed left shoulder block (10) and the right side respectively on tool body (2) Shoulder block (6), middle multigroup mounting screw holes and the fixed workpiece support (8) of dowel hole installation；Described liquid presses piston pole (3) For multi-step cylinder, small end cylindrical end face makees internal thread hole to be connected with universal joint connection ring (9), middle maximum cylindrical Part is piston, its piston external diameter and oil har opening internal diameter snug sliding fit, and making seal groove on piston loads O-ring seal；Institute The cylinder body bottom (4) stated is two step cylinders, and making a seal groove on small cylinder loads O-ring seal, big cylinder end 4 socket cap screw holes are made in face, and cylinder body bottom (4) and the oil har opening of chuck body (2) are fixed by soket head cap screw Connection；Described briquetting connecting rod (5) is thin cylindrical bar, and its one end is made have screwed hole to be easy to assemble and disassemble, passed through briquetting connecting rod (5) Connect pressing plate (7) and universal joint connection ring (9)；Described right shoulder block (6) is inverted T shaped cuboid, makees to have on the cuboid of its underpart Hexad socket cap screw hole and two dowel holes, by socket cap screw and alignment pin right shoulder block (6) with chuck body (2) right-hand member precise positioning and fastening, right side also makees have one group of R arc groove on the cuboid of its underpart, to avoid living Stopper rod (3), make two imitative works respectively along at left and right sides of right shoulder block (6) length direction above the cuboid on right shoulder block (6) top The outer convex globoidal of part diameter, to be contacted with the inner concave arc surface of pressing plate (7) bear pressure；Described pressing plate (7) is similar inverted T shaped The parallel prismatic of cuboid is the pressing plate of main body, and the angle of its prismatic is the lead angle of workpiece (19) tooth form, under pressing plate (7) Portion is the parallel prismatic panel of similar cuboid plate, makees imitative workpiece (19) diameter indent circular arc body in its two side, with workpiece (19) Or contacted with right shoulder block (6), pressing plate (7) top is made similar to top in the parallel prismatic body of cuboid along pressing plate (7) length direction There is the direction that circular hole and length direction are vertical in one to make there are two square holes, to through briquetting connecting rod (5) and universal joint connection ring (9)；Described workpiece support (8) is inverted T shaped cuboid, makees have hexagonal spiral shell in hexad socket cap on the cuboid of its underpart Nail and two dowel holes, it is by socket cap screw and alignment pin that workpiece support (8) and chuck body (2) is accurate Position and fasten, the left and right sides also makees there are two groups of R arc grooves on the cuboid of its underpart, to avoid piston rod (3), in workpiece support (8) there is the semicircle cambered surface of an imitative diameter of work above the cuboid on top along workpiece support (8) length direction work, to prop up Support workpiece (19), workpiece (19) be the quenched elongated pole material refined, its semi arch make to have downwards and support base (8) under Six grooves of plane perpendicular and six holes, as porus excretorius, discharge cutting fluid and abrasive dust, this porus excretorius and the row in chuck body (2) Hole (22) is let out to communicate；Make external screw thread and liquid presses piston pole (3) termination on described its lower end cylinder of universal joint connection ring (9) Internal thread connects, and its upper end is outer shroud and mobilizable inner ring, makes universal joint connection ring (9) and pressure by briquetting connecting rod (5) Plate (7) connects；Described left shoulder block (10) is inverted T shaped cuboid, makees to have six in hexad socket cap on the cuboid of its underpart Angle screw hole and two dowel holes, it is by socket cap screw and alignment pin that left shoulder block (10) and chuck body (2) is left Precise positioning and fastening are held, its underpart cuboid upper left side also makees have one group of R arc groove, to avoid piston rod (3), in left shoulder block (10) the outer convex arc of two imitative diameters of work is made above the cuboid on top respectively along at left and right sides of left shoulder block (10) length direction Face, to be contacted with pressing plate (7) inner concave arc surface bear pressure；Described oilhole screw plug (11) and chuck body (2) left end Oilhole screw threads for fastening connects；Described oil connection (12) two is external pipe thread, and centre is hexahedron, and endoporus is oil-through-hole, Oil connection (12) one is connected with chuck body (2) right-hand member oil circuit port internal thread, other end respectively with hydraulic station oil pipe (20) connected with oil pipe (21) interface；Described limiting plate (13) is cuboid, and cuboid bottom surface makees have one along its length Five socket cap screw holes of group, limiting plate (13) is fixed on the left of chuck body (2) by socket cap screw At the concave station of top, on limiting plate (13) plane, do one group of seven rectangular slot along its length, installing locating piece (14), corresponding socket cap screw hole is made in the bottom surface of each rectangular slot, to be fixedly connected with locating piece (14)； Described locating piece (14) is small cuboid, and its small cuboid front makees have two screwed holes, by soket head cap screw locating piece (14) it is fixedly connected with limiting plate (13), it is the axial location for limiting workpiece (19) that it, which is acted on, realizes workpiece (19) axially precisely Positioning；Described alignment pin (15) is taper bolt, and it is clamp bottom board (1) and chuck body (2) is installed precise positioning that it, which is acted on,； Described both sides oilhole screw plug (16), it is threadedly coupled with chuck body (2) both sides oil circuit, its effect is to block chuck body (2) both sides oil circuit prevents oil leak；Described platen positioning key (17) is T-shaped cuboid, makees socket cap on T-shaped cuboid Soket head cap screw hole, coordinated by the elongated key slot at both ends on positioning key (17) small end and clamp bottom board (1), with socket cap six The screwed hole of angle screw and clamp bottom board (1) bottom surface is fastenedly connected, big end and the T-shaped on platen of positioning key (17) Groove precisely coordinates, to reduce the time of calibration clamp；Described workpiece holder (18) is that triangle support frame passes through interior hexagonal Screw supports workpiece (19) tail end, makes workpiece steady on fixture with being fixedly connected on the right side of chuck body (2).