CN206662771U - Fixture for milling shift fork flat surface - Google Patents

Abstract

A fixture for milling the platform surface of a shift fork, including a clamp body, a stud, a movable pressure plate, a double-ended stud, a positioning pin 1, a positioning pin 2, a tool setting block and a positioning key, and the positioning pin 1 and the positioning pin 2 are set On the clamp body, the distance between the first axis of the positioning pin and the second axis of the positioning pin is equal to the distance between the two through holes on the blank; there is an oblong hole on the moving platen, and a horizontal groove is provided on its lower surface; The lower end of the head stud is threaded with the clamp body, and the upper end is screwed with a washer and nut after passing through the oblong hole of the moving platen. A spring is arranged between the clamp body and the stud; the lower end of the stud is threaded with the clamp body, and the upper end Cooperate with the groove on the lower surface of the movable pressure plate; the positioning key is arranged on the lower plane of the bottom plate of the clamp body; the knife setting block is fixed on the upper plane of the clamp body by screw one. The fixture takes the two holes on one side of the shift fork blank as the positioning reference, realizes complete positioning, and is pressed by a moving pressure plate. The structure is simple and reliable, and the replacement of parts is convenient.

Description

Fixture for milling the platform face of the shift fork

technical field

The utility model relates to a milling machine clamp, in particular to a clamp used for milling the platform surface of a shift fork, which belongs to the technical field of mechanical processing.

Background technique

The part shown in Figure 1 is a shift fork, which is located in the transmission mechanism of the machine tool and mainly plays the role of shifting gears, so that the rotary motion of the main shaft can work according to the requirements of the worker. The material of the part is malleable cast iron, which can be obtained by forging a blank and then mechanically cutting it. During forging, usually two parts are forged into a symmetrical blank, and then the parts are obtained by subsequent machining. The milling machine is a machine tool with a wide range of uses. It can process planes, grooves, toothed parts, spiral surfaces and various curved surfaces on the milling machine. There are corresponding fixtures to ensure the positioning and clamping of the workpiece.

Contents of the invention

In order to solve the above problems, the utility model provides a fixture for milling the platform surface of the shift fork. The fixture uses the two holes on one side of the shift fork blank as the positioning reference to realize complete positioning. It is pressed by a moving platen and has a simple and reliable structure. It is convenient to replace parts, easy to install, and has high processing efficiency.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a fixture for milling the platform surface of a shift fork, including a clamp body, a stud, a moving platen, a double-ended stud, one positioning pin, two positioning pins, and a tool setting Block and positioning key, the left and right ends of the clamp body are respectively provided with two U-shaped mounting ear seats, the positioning pin one and the positioning pin two are arranged on the upper plane of the clamp body, the axis of the positioning pin one and the positioning pin The distance between the axes of the two pins is equal to the distance between the two through holes in the upper and lower directions on the shift fork blank, and the positioning pin 1 and the positioning pin 2 are located in the center plane of the clamp body in the front and rear direction; the two moving pressure plates are left and right symmetrical For setting, a long circular hole is arranged on the moving platen, and a horizontal groove in the left and right direction is arranged on the end of the lower surface far away from the shift fork blank; Specifically threaded connection, the upper end passes through the oblong hole of the moving platen and is screwed with a washer and a nut, and a spring is arranged between the clamp body and the double-headed stud; The connection, the upper end is matched with the groove on the lower surface of the moving platen; the positioning key is set on the lower plane of the bottom plate of the clamp body; the knife setting block is fixed on the upper plane of the clamp body by screw one;

Further, it also includes a support plate, the support plate is located between the positioning pin 1 and the positioning pin 2, and is fixed on the upper plane of the clamp body by the screw 2, and its height is equal to the height of the positioning shoulders of the positioning pin 1 and the positioning pin 2;

Further, the number of the positioning keys is two, and the A-type positioning key is selected, and the positioning side faces on the same side of the two positioning keys are in the same plane, and the positioning keys are fixed on the clamp body by screw three;

Further, one of the positioning pins 1 and 2 is a cylindrical pin, and the other is a rhombic pin.

The utility model takes the bottom surface of the shift fork blank and two holes as the positioning reference, realizes the complete positioning of the workpiece, adopts the movable pressing plate to clamp, the positioning accuracy is high, and the clamping is reliable; The processing of the knife. The fixture has a simple and reliable structure, is convenient to replace parts, is easy to install, and has high processing efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of a shift fork.

Fig. 2 is the front view of the utility model.

Fig. 3 is a top view of the utility model.

Fig. 4 is a left view of the utility model.

FIG. 5 is a cross-sectional view along line A-A of FIG. 3 .

In the figure: 1. Clamp body, 2. Stud, 3. Moving platen, 4. Spring, 5. Washer, 6. Nut, 7. Stud stud, 8. Locating pin one, 9, Locating pin two, 10 , Tool setting block, 11, screw one, 12, screw two, 13, positioning key, 14, screw three, 15, support plate.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described (left-right direction in the following description, up-down direction, front-back direction and left-right direction in Fig. 2, up-down direction, front-back direction are identical, and the direction away from the reader is after among Fig. 2).

As shown in Figure 1 is the parts diagram of the shift fork to be processed, from Figure 1(a) to Figure 1(c) are the front view, top view and A-A sectional view of the shift fork respectively; as shown in Figure 2 to Figure 4, a A fixture for milling the platform surface of a shift fork, comprising a fixture body 1, a stud 2, a moving pressure plate 3, a double-ended stud 7, a positioning pin 1 8, a positioning pin 2 9, a tool setting block 10 and a positioning key 13. The left and right ends of the clamp body 1 are respectively provided with two front and rear U-shaped mounting ear seats, and the positioning pin 1 8 and the positioning pin 2 9 are arranged on the upper plane of the clamp body 1, and the positioning pin 1 8 axis and the positioning pin The distance between the two 9 axes is equal to the distance between the two through holes in the upper and lower directions on the shift fork blank, and the positioning pin 1 8 and the positioning pin 2 9 are located in the center plane of the front and rear direction of the clamp body 1; the two moving The pressure plate 3 is symmetrically arranged left and right, and the mobile pressure plate 3 is provided with an oblong hole, and the end of the lower surface away from the shift fork blank is provided with a horizontal groove in the left and right directions; The lower end of the stud 7 is threadedly connected with the clamp body 1, and the upper end passes through the oblong hole of the moving platen 3 and is screwed with a washer 5 and a nut 6, and a spring 4 is arranged between the clamp body 1 and the double-ended stud 7; The studs 2 are symmetrically arranged left and right, the lower end of which is threadedly connected with the clamp body 1, and the upper end is matched with the groove on the lower surface of the moving platen 3; the positioning key 9 is arranged on the lower plane of the bottom plate of the clamp body 1; The above-mentioned tool setting block 10 is fixed on the upper plane of the clamp body 1 by screw one 11.

Working principle: After assembling the fixture, install the fixture as a whole on the workbench of the milling machine; place the shift fork blank on the upper plane of the fixture body 1, and align the positioning pin 1 8 and positioning pin 2 9 with the shift fork blank The two holes are matched. At this time, the two positioning pins and the shoulder end of the positioning pin are used to completely position the two holes on one side of the shift fork workpiece. At this time, the automatic pressure plate 3 is moved downward, so that the stud 2 Place the upper end of the moving platen 3 in the groove on the lower surface, tighten the nut 6, so that the moving platen 3 presses the fork blank, and then the milling platform surface can be processed. Move upward under the effect of the restoring force of the spring 4, so that the moving press plate 3 is out of contact with the shift fork blank, and the workpiece is taken down to process the next workpiece.

Described fixture also comprises support plate 15, and support plate 15 is positioned between alignment pin one 8 and alignment pin two 9, is fixed on the clamp body upper plane by screw two 12, and its height and alignment pin one 8 and alignment pin two 9 The heights of the positioning shoulders are equal; the support plate 15 acts as an auxiliary support to prevent the force of milling from deforming the positioning pin 1 8 and positioning pin 2 9 and affecting the accuracy of the fixture.

Described positioning key 13 quantity is two, selects A type positioning key for use, the positioning side of two positioning keys 13 same sides is in the same plane, and positioning key 13 is fixed on clamp body 1 by screw 3 14; During installation, two The distance between the two positioning keys 13 is as far as possible to improve the installation accuracy of the fixture, and the positioning keys 13 and screw three 14 are selected as standard parts to facilitate fittings, installation and reliable positioning.

One of the first positioning pin 8 and the second positioning pin 9 is a cylindrical pin, and the other is a rhombic pin, and the two pins cooperate with each other for positioning, which can realize complete positioning without over-positioning, which is convenient for installation.

Claims (4)

1. A fixture for milling the platform surface of a shift fork, characterized in that it includes a fixture body (1), a stud (2), a moving platen (3), a double-ended stud (7), a positioning pin (8 ), positioning pin two (9), tool setting block (10) and positioning key (13), the left and right ends of the clamp body (1) are respectively provided with front and rear two U-shaped mounting lugs, and the positioning pin One (8) and positioning pin two (9) are located on the upper plane of the clamp body (1), and the distance between the axis of positioning pin one (8) and the axis of positioning pin two (9) is the same as that of the upper and lower sides of the shift fork blank. The distance between the through holes in the direction is equal, and the positioning pin one (8) and the positioning pin two (9) are located in the front and rear direction center plane of the clamp body (1); The pressure plate (3) is provided with an oblong hole, and the end of the lower surface away from the shift fork blank is provided with horizontal grooves in the left and right directions; the two described studs (7) are symmetrically arranged left and right, and the studs ( The lower end of 7) is threadedly connected with the clamp body (1), and the upper end passes through the oblong hole of the moving platen (3) and is screwed with a washer (5) and a nut (6). ) is provided with a spring (4); the two studs (2) are left and right symmetrically arranged, the lower end of which is threadedly connected with the clamp body (1), and the upper end is matched with the groove on the lower surface of the movable pressure plate (3) The positioning key (9) is set on the lower plane of the clamp body (1) bottom plate; the knife setting block (10) is fixed on the upper plane of the clamp body (1) by screw one (11). 2. A clamp for milling the platform surface of a shift fork according to claim 1, characterized in that: it also includes a support plate (15), and the support plate (15) is located between the positioning pin one (8) and the positioning pin two ( 9), be fixed on the clamp body upper plane by screw two (12), and its height is equal to the height of the positioning shoulder of positioning pin one (8) and positioning pin two (9). 3. A fixture for milling the platform surface of a shift fork according to claim 1 or 2, characterized in that: the number of the positioning keys (13) is two, the A-type positioning key is selected, and the two positioning keys (13) The positioning side on the same side is in the same plane, and the positioning key (13) is fixed on the clamp body (1) by screw three (14). 4. A fixture for milling the platform surface of a shift fork according to claim 3, characterized in that: one of the positioning pins one (8) and two positioning pins (9) is a cylindrical pin, and the other is a rhombus pin.