Clamp for tapping axle housing upper half

Abstract

A kind of fixture for tapping on axle housing upper half, including bottom plate, the oil cylinder mounting seat is set on the upper end of the bottom plate, support frame, the support seat is set on the upper end of the oil cylinder mounting seat, support seat sets through-hole, clearance fit slip bush is arranged in through-hole, setting locating taper pin in slip bush, the pin hole is set on the slip bush, locating taper pin is set on the strip-shaped hole, a cross pin is inserted into pin hole and strip-shaped hole, so that locating taper pin and slip bush are fixedly connected, telescopic oil cylinder is set in the cavity of the oil cylinder mounting seat, the piston rod of telescopic oil cylinder is fixedly connected with slip bush, the upper end of the oil cylinder mounting seat is set with pressing oil cylinder, the piston rod of pressing oil cylinder is fixedly connected with pressing claw, the left and right sides of the support frame are set with extension arm, the extension arm is set with angle plate, the cross arm of the angle plate is fixedly connected on the extension arm by bolt, locating column is set on inclined arm.The fixture can accurately position the vent hole position of axle housing, drilling center machining is adopted, the processing rate and tapping quality are improved, and the labor cost is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of automotive axle housing machining positioning fixtures, specifically relating to a fixture for tapping the upper half of an axle housing. Background Technology

[0002] With the development of electric microcars in China, integral rear axles have become mainstream. After machining threaded vent holes and installing NPT 1 / 8 pipe threads on the upper axle housing, these holes become exhaust channels for the sealed cavity of the axle housing. The machining quality of these threaded vent holes directly affects the sealing performance of the axle housing assembly. Currently, manual tapping is commonly used, which is time-consuming and labor-intensive. Furthermore, due to issues such as taper, ellipticity, and slant in stamped holes, manual tapping cannot guarantee the correct taper and depth, leading to difficulties in assembling the vent plug or problems with air leakage.

[0003] The publication number CN 110170711 A, entitled "A Positioning Fixture for an Automatic Tapping Machine for Vent Holes in Rear Axle Housings and Its Usage Method," discloses a positioning fixture for an automatic tapping machine for vent holes in rear axle housings. The technical solution is as follows: Before machining the threads of the vent holes in the rear axle housings, the thread bottom hole is clamped onto the positioning pin. The manual air valve is operated to control the cylinder to drive the clamping plate downward to press the axle housing, quickly completing the positioning and clamping. The automatic tapping machine is then started to perform thread machining. When the tap moves downward, it blocks the positioning pin as it moves downward. After the thread machining is completed, the tap returns to its original position, and the compressed return spring drives the positioning pin to move up and down to return to its original position. Although this technical solution can replace manual tapping and automatically tap the vent hole on the bridge housing, the vent hole is located on one side of the bridge housing. The bridge housing is positioned solely by the locating pin and clamping plate. Since the left and right arms of the vent hole are of different lengths and the center of gravity is unbalanced, the bridge housing may slide or tilt during the clamping process, making it difficult to position. Furthermore, after the locating pin positions the threaded bottom hole of the bridge housing, the tap of the automatic tapping machine moves down to block the locating pin, which makes the locating pin prone to damage. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a fixture for tapping the upper half of an axle housing. This fixture can accurately locate the vent hole position of the axle housing, and the machining is performed using a drilling center, thereby improving the machining speed and tapping quality while reducing labor costs.

[0005] The objective of this invention is achieved as follows:

[0006] A fixture for tapping the upper half of an axle housing includes a base plate. A cylinder mounting seat and a support frame are respectively provided on the upper end of the base plate. A support seat is provided on the upper end of the cylinder mounting seat. A through hole is longitudinally provided in the support seat. A sliding sleeve is fitted with the through hole with clearance. A positioning tapered pin is provided in the sliding sleeve. A pin hole is provided on the sliding sleeve. A strip-shaped hole extending axially is provided on the positioning tapered pin. A transverse pin is inserted into the pin hole and the strip-shaped hole to fix the positioning tapered pin and the sliding sleeve. A transversely open cavity is provided on the cylinder mounting seat. An internal telescopic hydraulic cylinder is installed. The extension end of the piston rod of the telescopic hydraulic cylinder passes through the cylinder mounting seat and is fixedly connected to the sliding sleeve. A spring is installed between the piston rod of the telescopic hydraulic cylinder and the positioning cone pin. A clamping hydraulic cylinder is installed at the upper end of the cylinder mounting seat. The piston rod of the clamping hydraulic cylinder is fixedly connected to the clamping claw. An extension arm is installed on the left and right sides of the support frame. An angle plate is installed at the extension end of the extension arm. The horizontal arm of the angle plate is fixedly connected to the extension arm by bolts. A positioning post is installed on the inclined arm for limiting the lower end of the axle housing.

[0007] The upper end of the support base is fixedly connected to a replaceable positioning block by multiple bolts, and the replaceable positioning block is provided with a clearance portion for the sliding sleeve to pass through.

[0008] The sliding sleeve is fixedly connected to the piston rod of the telescopic cylinder via a connecting flange.

[0009] The extension arm is provided with a first adjustment groove, and is fixedly connected to the support frame by bolts passing through the first adjustment groove.

[0010] A floating claw is hinged inside the clamping claw, so that the floating claw can completely fit the bridge shell when the clamping claw is pressed down.

[0011] The cross arm of the angle plate is fixedly connected to the upper or lower end of the extension arm by bolts.

[0012] A second adjustment groove is provided on the inclined arm of the angle plate, and a bolt passes through the second adjustment groove and is fixedly connected to the positioning post.

[0013] A third adjustment groove is provided on the inclined arm of the angle plate, and multiple bolts pass through the third adjustment groove and are fixedly connected to the angle plate.

[0014] The base plate is equipped with multiple lifting rings for lifting clamps.

[0015] The beneficial effects of this invention are as follows: The fixture of this invention can position bridge housings of different specifications and models. First, the lower end of the bridge housing is positioned by the positioning pin to prevent displacement during the clamping process. Then, the position of the vent hole is positioned by the positioning cone pin. After that, the clamping claw presses down to perform automatic tapping, which improves the processing speed and tapping quality and reduces labor costs. Moreover, before the tool of the automatic tapping machine drills the hole, the positioning cone pin moves down by the retraction of the telescopic cylinder to avoid the tool, so as not to damage the positioning cone pin and increase its service life. Attached Figure Description

[0016] Figure 1 This is a top view of the structure of the present invention;

[0017] Figure 2 for Figure 1 Sectional view at point AA;

[0018] Figure 3 for Figure 1 View from direction B;

[0019] Figure 4 This is a schematic diagram of the clamping claw of the present invention;

[0020] Figure 5 This is a schematic diagram of the support base and positioning block of the present invention;

[0021] Figure 6 This is a cross-sectional view of the sliding sleeve and positioning cone pin of the present invention.

[0022] Reference numerals in the attached drawings: 1. Hydraulic cylinder mounting base; 2. Support base; 3. Replaceable positioning block; 3a. Clearance part; 4. Telescopic hydraulic cylinder; 4a. Cavity; 5. Connecting flange; 6. Sliding sleeve; 6a. Spring; 6b. Pin hole; 7. Positioning cone pin; 7a. Strip hole; 7b. Horizontal pin; 8. Clamping cylinder; 9. Clamping claw; 9a. Floating claw; 10. Bridge housing; 11. Base plate; 12. Support frame; 13. Extension arm; 13a. First adjustment groove; 14. Angle plate; 14a. Horizontal arm; 14b. Inclined arm; 14b. Second adjustment groove; 14b-1. Third adjustment groove; 14b-2. Positioning column; 15. Lifting ring; 16. Detailed Implementation

[0023] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details.

[0024] See Figures 1 to 6An embodiment of a fixture for tapping the upper half of a bridge housing includes a base plate 11, a cylinder mounting base 1, and a support frame 12. The upper end of the base plate 11 is respectively provided with a cylinder mounting seat 1 and a support frame 12. Two support seats 2 are provided on the upper end of the cylinder mounting seat 1. A through hole is provided in the longitudinal direction in the support seat 2. A sliding sleeve 6 is fitted in the through hole with clearance. A positioning cone pin 7 is provided in the sliding sleeve 6. A pin hole 6b is provided on the sliding sleeve 6. A strip hole 7a is provided on the positioning cone pin 7. A horizontal pin 7b is inserted into the pin hole 6b and the strip hole 7a to fix the positioning cone pin 7 and the sliding sleeve 6. A transversely open cavity 4a is provided on the cylinder mounting seat 1. A telescopic cylinder 4 is provided in the transversely open cavity 4a. The extension end of the piston rod of the telescopic cylinder 4 passes through the cylinder mounting seat 1 and is threaded to the lower end of the connecting flange 5. The upper end of the connecting flange 5 is engaged with the sliding sleeve 6. A spring 6a is provided between the connecting flange 5 and the positioning cone pin 7 to allow the positioning cone pin 7 to move up and down freely in the sliding sleeve 6.

[0025] The upper end of the support base 2 is fixedly connected to a replaceable positioning block 3 by multiple bolts. The upper end surface of the replaceable positioning block 3 is modeled after the product surface and can fit completely with the bridge housing 10. A clearance part 3a is provided on the replaceable positioning block 3 for the sliding sleeve 6 to pass through.

[0026] A clamping cylinder 8 is provided at the upper end of the cylinder mounting base 1. The piston rod of the clamping cylinder 8 is fixedly connected to the clamping claw 9. A floating claw 9a is hinged in the clamping claw 9 so that the floating claw 9a can completely fit the bridge housing 10 when the clamping claw 9 is pressed down.

[0027] An extension arm 13 is provided on the left and right sides of the support frame 12. A first adjustment groove 13a is provided on the extension arm 13. The extension arm 13 is fixedly connected to the support frame 12 by bolts passing through the first adjustment groove 13a. The position of the extension arm 13 can be adjusted left and right according to the length of the bridge housing 10. An angle plate 14 is provided at the extension end of the extension arm 13. The horizontal arm 14a of the angle plate 14 is fixedly connected to the upper or lower end of the extension arm 13 by bolts. A third adjustment groove 14b-2 is provided on the inclined arm 14b of the angle plate 14. Three bolts pass through the third adjustment groove 14b-2 and are fixedly connected to the angle plate 14 for fine-tuning the up and down of the inclined arm 14b. A second adjustment groove 14b-1 is provided on the inclined arm 14b of the angle plate 14. A bolt passes through the second adjustment groove 14b-1 and is fixedly connected to the semi-cylindrical positioning post 15 for limiting the lower end of the bridge housing 10.

[0028] Multiple lifting rings 16 are provided on the base plate 11 for lifting clamps.

[0029] The working principle of this invention is as follows: ① First, adjust the position of the extension arm 13 and the angle plate 14 according to the length of the bridge housing 10, and install the lower end of the bridge housing 10 on the positioning post 15. Then, push out the piston rod of the telescopic cylinder 4, so that the sliding sleeve 6 moves up and the pre-punched hole on the bridge housing 10 is locked in the positioning cone pin 7. After the positioning bridge housing 10 is installed in both stations, press the automatic processing button of the equipment; ② The machining program controls the clamping cylinder 8 to work, so that the clamping claw 9 and the floating claw 9a press down to clamp the bridge housing 10; ③ After the machining program delays for 1.5 seconds, control the telescopic cylinder 4 to retract, driving the sliding sleeve 6 to move down; ④ Start machining, drilling, chamfering, and tapping; ⑤ After the machining is completed, the program controls the clamping cylinder 8 to release, and at the same time the telescopic cylinder 4 extends; ⑥ Manually remove the part.

[0030] The fixture of this invention can position the lower end of bridge housing 10 of different specifications and models, preventing the bridge housing 10 from shifting during the pressing of the clamping claw 9. After the vent hole is positioned by the positioning cone pin 7, automatic tapping is performed, which improves the processing speed and tapping quality and reduces labor costs. Moreover, before the tool of the automatic tapping machine drills the hole, the positioning cone pin 7 avoids the tool by the retraction of the telescopic cylinder 4 and the downward movement of the sliding sleeve 6, thus preventing damage to the positioning cone pin 7 and increasing its service life.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A clamp for tapping the upper half of a bridge housing, comprising a base plate (11), characterized in that: The upper end of the base plate (11) is provided with a cylinder mounting seat (1) and a support frame (12). The upper end of the cylinder mounting seat (1) is provided with a support seat (2). A through hole is provided in the support seat (2) longitudinally. A sliding sleeve (6) is fitted in the through hole with clearance. A positioning cone pin (7) is provided in the sliding sleeve (6). A pin hole (6b) is provided on the sliding sleeve (6). A strip hole (7a) extending axially is provided on the positioning cone pin (7). A horizontal pin (7b) is inserted into the pin hole (6b) and the strip hole (7a) to fix the positioning cone pin (7) and the sliding sleeve (6) together. A transversely open cavity (4a) is provided on the cylinder mounting seat (1). A telescopic cylinder (4) is provided in the transversely open cavity (4a). The piston rod extension end of the telescopic cylinder (4) passes through the cylinder mounting seat (1) and is fixedly connected to the sliding sleeve (6). A spring (6a) is provided between the piston rod of the telescopic cylinder (4) and the positioning cone pin (7). A clamping cylinder (8) is provided at the upper end of the cylinder mounting seat (1). The piston rod of the clamping cylinder (8) is fixedly connected to the clamping claw (9). An extension arm (13) is provided on the left and right sides of the support frame (12). An angle plate (14) is provided at the extension end of the extension arm (13). The horizontal arm (14a) of the angle plate (14) is fixedly connected to the extension arm (13) by bolts. A positioning post (15) is provided on the inclined arm (14b) for limiting the lower end of the bridge housing (10).

2. The fixture for tapping the upper half of a bridge housing according to claim 1, characterized in that: The upper end of the support base (2) is fixedly connected to a replaceable positioning block (3) by multiple bolts. The replaceable positioning block (3) is provided with a clearance part (3a) for the sliding sleeve (6) to pass through.

3. The fixture for tapping the upper half of a bridge housing according to claim 1, characterized in that: The sliding sleeve (6) is fixedly connected to the piston rod of the telescopic cylinder (4) via a connecting flange (5).

4. The fixture for tapping the upper half of the bridge housing according to claim 1, characterized in that: The extension arm (13) is provided with a first adjustment groove (13a), and is fixedly connected to the support frame (12) by bolts passing through the first adjustment groove (13a).

5. The fixture for tapping the upper half of a bridge housing according to claim 1, characterized in that: A floating claw (9a) is hinged inside the clamping claw (9) so that the floating claw (9a) can completely fit the bridge shell (10) when the clamping claw (9) is pressed down.

6. The fixture for tapping the upper half of a bridge housing according to claim 1, characterized in that: The cross arm (14a) of the angle plate (14) is fixedly connected to the upper or lower end of the extension arm (13) by bolts.

7. The fixture for tapping the upper half of a bridge housing according to claim 1, characterized in that: The angle plate (14) has a second adjustment groove (14b-1) on its inclined arm (14b), and a bolt passes through the second adjustment groove (14b-1) and is fixedly connected to the positioning post (15).

8. The fixture for tapping the upper half of a bridge housing according to claim 1, characterized in that: The angle plate (14) has a third adjustment groove (14b-2) on its inclined arm (14b), and multiple bolts pass through the third adjustment groove (14b-2) and are fixedly connected to the angle plate (14).

9. The fixture for tapping the upper half of a bridge housing according to claim 1, characterized in that: Multiple lifting rings (16) are provided on the base plate (11) for lifting clamps.

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