CN201371312Y - Special Fixture for Friction Welding of Tripin Fork and Hollow Tube - Google Patents

Abstract

The utility model discloses a special fixture for friction welding of a three-pin shaft fork and a hollow tube, which comprises a base (1), a guide rod (2), a guide base plate (6), a spring (3) and at least three guide columns ( 4), the front end of the base (1) is provided with a positioning block (5), the rear end of the base (1) is fixedly connected to the guide rod (2), and the guide rod (2) is sleeved The spring (3) and the guide base plate (6), the rear end of the guide rod (2) is provided with a baffle plate (21), and the front end of the spring (3) leans against the guide base plate (6) On, the rear end of the spring (3) leans against the baffle (21), the rear end of the guide post (4) is fixedly connected with the guide base plate (6), and the front end of the guide post (4) passes through Through the base (1), the guide posts (4) are distributed on the same circle, and the center line of the circle coincides with the rotation center line of the base (1), and each guide post (4) A chamfer (41) is provided on the outside of the front end. Such a positioning method and positioning accuracy will not decrease with the wear of the fixture, and the positioning reference is consistent with the subsequent turning.

Description

Special Fixture for Friction Welding of Tripin Fork and Hollow Tube

technical field

The utility model relates to a fixture, in particular to a special fixture for friction welding of a three-pin shaft fork and a hollow tube.

Background technique

The friction welding of the traditional three-pin shaft fork and the hollow tube is based on the large plane of the shaft fork to clamp the large outer circle of the shaft fork. Since the turning of the shaft fork handle is based on the inner hole of the shaft fork as the clamping positioning surface, the shaft The coaxiality of the fork handle and the inner hole of the shaft fork should be better. When precision forging the shaft fork blank, there is a concentricity error of 0.4mm between the precision forging punch and the outer die, so the outer circle of the shaft fork and the inner hole have a concentricity deviation of less than 0.4mm, so that the outer circle of the shaft fork and the inner hole are less than 0.4mm. The concentricity of the yoke shank will not be ideal. Whenever the hollow tube is welded to the shank of the tripod yoke, the radial runout of the yoke shank is sometimes greater than 1 mm. Especially when the hollow tube is welded to the shank of the shaft yoke, the shank of the shaft yoke is no longer turned, resulting in obvious misalignment of the two ends of the friction welding of the finished workpiece, which not only affects the appearance quality, but also affects the loading of the bearing.

Moreover, in the traditional welding of the outer circle of the clamping shaft and fork, we do not consider the error of the workpiece itself, but only observe the outer circle fixture and find that the three jaws are only connected to the chuck by positioning blocks and screws. After a period of time, the fixture wears out, and the three jaws themselves The beating of the fixture will be very unsatisfactory, and cushions and gaskets are needed to ensure the accuracy of the fixture itself. Such adjustments can be said to be time-consuming and labor-intensive.

Utility model content

The technical problem to be solved by the utility model is to provide a special fixture for friction welding of a tripod shaft fork and a hollow tube with high positioning accuracy.

In order to solve the above-mentioned technical problems, the special fixture for the friction welding of the three-pin shaft fork and the hollow pipe of the present invention includes a base, a guide rod, a guide base plate, a spring and at least three guide posts, and a positioning block is arranged at the front end of the base, The rear end of the base is fixedly connected to the guide rod, the spring and the guide base plate are sleeved on the guide rod, the front end of the spring is against the guide base plate, and the rear end of the spring is Against the baffle plate, the rear end of the guide post is fixedly connected to the guide base plate, the front end of the guide post passes through the base, the guide posts are distributed on the same circumference, and the center line of the circumference Coincident with the rotation centerline of the base, chamfers are provided on the outside of the front end of each guide post.

Preferably, the matching relationship between the guide post and the base is clearance fit, so that it can slide back and forth in the base.

Preferably, a spacer is provided between the positioning block and the base, and the distance between the positioning block and the base can be adjusted by using spacers of different thicknesses. The positioning block and the washer are fixed on the base by screws.

Preferably, the base includes a shaft portion and a shoulder portion, a transition block is sleeved on the shaft portion, and the transition block is fixed on the shoulder portion.

Preferably, the base is connected with a power rotation mechanism.

The clamping positioning of the utility model self-centers the inner cavity of the workpiece through the finger-shaped guide post, and then the clamping claw clamps the shaft fork handle. The positioning accuracy of this positioning method will not decrease with the wear of the clamp, and the positioning reference It is consistent with the subsequent turning, so the runout of the welded part of the processed workpiece can be guaranteed to be within 0.2mm. The positioning and clamping datum is consistent with the measuring datum after friction welding, which effectively prevents the problem of non-concentricity between the tripod fork wheel body and the shaft handle after friction welding due to the run-out error of the forging. The utility model has the advantages of simple structure, convenient assembly and disassembly, and more labor-saving and convenient fixture replacement.

Description of drawings

Fig. 1 is the use reference figure of the utility model.

The reference signs are as follows:

1. Base 41. Chamfer

11. Shaft part 5. Positioning block

12. Shoulder 51. Gasket

13. Pin 6. Guide plate

2. Guide rod 7. Transition block

21. Baffle 8. Screws

3. Spring 91. Clamping claw

4. Guide post 92. Three-pin shaft fork

Detailed ways

The following will describe in detail the special fixture for friction welding of the three-pin shaft fork and the hollow pipe of the present invention with reference to the accompanying drawings.

As shown in Figure 1, the utility model comprises a base 1, a guide rod 2, a guide base plate 6, a spring 3 and a guide column 4, and one end of the base 1 is fixed with a positioning block 5 by an inner hexagon screw 8, and the positioning block 5 and A spacer 51 is arranged between the bases 1 to adjust the position of the positioning block 5 . The other end of the base 1 is fixed with a guide rod 2 , a spring 3 is placed on the guide rod 2 , the rear end of the guide rod 2 is fixed with a baffle 21 by a screw 8 , and the spring 3 leans against the baffle 21 . The other end of the spring 3 is provided with a guide base plate 6, and the guide base plate 6 is sleeved on the guide rod 2, and is clearance fit with the guide rod 2.

Three guide posts 4 are fixed on the guide base plate 6 , and one end of each guide post 4 is provided with a chamfer 41 , which matches with the inner chamfer 41 of the end of the three-pin shaft fork 92 . The centerlines of the chamfers 41 of all the guide posts 4 coincide with the rotation centerline of the base 1 . The guide post 4 passes through the through hole of the base 1, and the matching relationship between the guide post 4 and the base 1 is 16H7/h7, which is a clearance fit. The guide post 4 can slide in the base 1 under the condition of overcoming the pretension force of the spring 3 .

The above-mentioned base 1 includes a shaft portion 11 and a shoulder portion 12 , the radial dimension of the shoulder portion 12 is larger than that of the shaft portion 11 . A transition block 7 is sleeved on the shaft portion 11 , and the transition block 7 is fixed on the shoulder portion 12 by a hexagon socket head cap screw 8 . Under normal circumstances, the transition piece 7 and the three-pin shaft fork do not contact, and the transition piece 7 limits the three-pin shaft fork to move backward along the guide post 4, and the limit position is set for the three-pin shaft fork. In addition, the guide area of the guide post is protected to prevent garbage from entering.

A pin 13 is also arranged on the base 1, and the pin 13 is used to be connected with the power rotating mechanism to drive the rotation of the utility model. The connection between the pin 13 and the base 1 can be bonded with special glue.

When the utility model is used to position and clamp the three-pin shaft fork 92, a part of the positioning block 5 and the base 1 is placed in the inner cavity of the three-pin shaft fork 92, and the positioning block 5 is against the inner cavity of the three-pin shaft fork 92 On the bottom surface, it plays an initial positioning effect, and supports the tripod shaft fork 92. Baffle plate 21 is fixed on the machine tool. When performing friction welding, the shaft tube to be welded is pressed against the shank of the three-pin shaft fork 92. At this time, the three guide posts 4 are closely attached to the inner chamfers 41 of the tripod shaft fork 92, and the guide post 4 drives the guide The bottom plate 6 compresses the spring 3 at the back of the guiding bottom plate 6 until the positioning block 5 in front of the base 1 abuts against the bottom of the inner cavity of the three-pin shaft fork 92 . Like this, utilize the location of three guide columns 4 to make the rotation center line of the present utility model coincide with the center line of tripod shaft fork 92, and the location of tripod shaft fork 92 has just been completed. Finally, the clamping claw 91 clamps the shaft fork shank, and the power rotating mechanism drives the utility model to rotate through the pin 13 to start welding.

The above design examples are only used to illustrate the utility model, and do not constitute a limitation to the scope of the claims. Other substantially equivalent means that can be thought of by those skilled in the art are all within the scope of the claims of the utility model.

Claims (5)

1. the friction welding (FW) special fixture of bearing pin fork and hollow pipe, it is characterized in that: comprise pedestal (1), guide rod (2), guiding base plate (6), spring (3) and at least three guide pillars (4), the front end of described pedestal (1) is provided with a positioning block (5), the fixedly connected described guide rod in the rear end of described pedestal (1) (2), described guide rod (2) is gone up described spring of socket (3) and described guiding base plate (6), the rear end of described guide rod (2) is provided with baffle plate (21), the front end of described spring (3) is resisted against on the described guiding base plate (6), the rear end of described spring (3) is resisted against on the described baffle plate (21), fixedly connected with guiding base plate (6) in the rear end of described guide pillar (4), the front end of guide pillar (4) passes described pedestal (1), described each guide pillar (4) is distributed on the same circumference, and the center line of this circumference overlaps with the rotation centerline of described pedestal (1), and the front end outside of each guide pillar (4) is provided with chamfering (41).

2. the friction welding (FW) special fixture of three bearing pins fork according to claim 1 and hollow pipe is characterized in that: described guide pillar (4) is a matched in clearance with the matching relationship of described pedestal (1).

3. the friction welding (FW) special fixture of three bearing pins fork according to claim 1 and hollow pipe, it is characterized in that: between described locating piece (5) and the described pedestal (1) pad (51) is set, described locating piece (5) and described pad (51) are fixed on the described pedestal (1) by screw (8).

4. the friction welding (FW) special fixture of three bearing pins fork according to claim 1 and hollow pipe, it is characterized in that: described pedestal (1) comprises an axial region (11) and a shoulder (12), described axial region (11) is gone up socket one transition block (7), and described transition block (7) is fixed on the described shoulder (12).

5. the friction welding (FW) special fixture of three bearing pins fork according to claim 1 and hollow pipe, it is characterized in that: described pedestal (1) links to each other with the power rotating mechanism.

Images