CN221337692U

CN221337692U - Knuckle turning and milling combined machining clamp

Info

Publication number: CN221337692U
Application number: CN202323391579.2U
Authority: CN
Inventors: 刘磊; 赵军
Original assignee: Shandong University
Current assignee: Shandong University
Filing date: 2023-12-12
Publication date: 2024-07-16
Anticipated expiration: 2033-12-12

Abstract

The clamp comprises a chassis, a base, a main shaft interface disc and a high-speed rotary joint; a first supporting seat, a second supporting seat, a base and a hydraulic cylinder supporting seat are arranged on one end surface of the chassis, a main shaft interface disc is arranged on the other end surface of the chassis, and a high-speed rotary joint is connected to the main shaft interface disc; the base is provided with an electric cylinder and a guide rail, the guide rail is provided with a center positioning block, and the center positioning block is connected with a push rod of the electric cylinder; two hydraulic cylinders are oppositely installed on the hydraulic cylinder supporting seat, the output end of each hydraulic cylinder is connected with a push rod, and the push rods are connected with the pressing claws. The utility model has good positioning effect and high accuracy on the steering knuckle, can save the manufacturing cost of the clamp and improve the processing efficiency.

Description

Knuckle turning and milling combined machining clamp

Technical Field

The utility model relates to a composite machining clamp for turning and milling a steering knuckle, and belongs to the technical field of steering knuckle machining.

Background

The unreasonable structure of the fixture selected by the numerical control machine tool can lead to the great reduction of the production efficiency of the numerical control machine tool. Through technical analysis, the production efficiency and the precision of the numerical control machine tool have a great relation with the use of the clamp. Because the automobile steering knuckle is complex in structure and irregular, all parts need to be machined respectively, in order to avoid being shielded by the machined parts in the machining process, special fixtures are often arranged on all the machined parts respectively, and fixture replacement is needed when the machined parts are replaced, so that machining efficiency is low. Particularly, for the turning and milling composite machining clamp of the steering knuckle, the position of the angular positioning component needs to be replaced and the requirements of high-speed and high-efficiency production need to be met.

Chinese patent document CN219986874U discloses a turning and milling composite machining fixture, although the clamping of the knuckle is more stable, but since the knuckle shaft end is also fixed on the base, the turning of the knuckle shaft end is limited, thereby affecting the cylindricity of the knuckle shaft end, and the fixture adjustment efficiency is low. In addition, during turning, dynamic unbalance is generated by the high-speed rotation of the spindle due to non-circularity of the knuckle, thereby affecting machining accuracy.

Therefore, in order to improve the processing efficiency and the processing precision of the steering knuckle and save the manufacturing cost of the clamp, it is necessary to design an integrated steering knuckle turning and milling composite clamp.

Disclosure of utility model

Aiming at the defects of the existing knuckle machining technology, the utility model aims to provide an integrated knuckle turning and milling composite machining clamp which has high speed and high efficiency, can effectively fix knuckles with different apertures, and can greatly reduce the replacement time of the clamp, thereby improving the machining efficiency and ensuring the machining precision.

The steering knuckle turning and milling composite machining clamp adopts the following technical scheme:

The fixture comprises a chassis, a base, a main shaft interface disc and a high-speed rotary joint; a first supporting seat, a second supporting seat, a base and a hydraulic cylinder supporting seat are arranged on one end surface of the chassis, a main shaft interface disc is arranged on the other end surface of the chassis, and a high-speed rotary joint is connected to the main shaft interface disc; the base is provided with an electric cylinder and a guide rail, the guide rail is provided with a center positioning block, and the center positioning block is connected with a push rod of the electric cylinder; two hydraulic cylinders are oppositely installed on the hydraulic cylinder supporting seat, the output end of each hydraulic cylinder is connected with a push rod, and the push rods are connected with the pressing claws.

The first supporting seat and the second supporting seat are symmetrically fixed on the chassis relative to the central axis of the chassis, and limit grooves and bolt holes matched with the bolt holes of the steering knuckle are formed in the upper ends of the first supporting seat and the second supporting seat and used for axially positioning the steering knuckle.

The base is positioned at the center of the chassis, and the first supporting seat and the second supporting seat are symmetrically arranged relative to the central axis of the chassis.

The end face of the chassis where the base is located is provided with a counterweight device, and the counterweight device and the hydraulic cylinder supporting seat are respectively positioned on two sides of the base. The counterweight device consists of a central counterweight block and edge counterweight blocks, the central counterweight block is axially symmetrically fixed on the chassis, and the edge counterweight blocks are axially symmetrically distributed relative to the central counterweight block, so that the dynamic balance of the clamp can be conveniently adjusted.

The guide rail is embedded and installed on the base.

And a cover plate for preventing the central positioning block from axially displacing due to vibration is arranged on the base and is positioned above the central positioning block.

The two hydraulic cylinders are symmetrical on the hydraulic cylinder supporting seat relative to the central axis of the chassis.

The main shaft interface disc is provided with a cylindrical pin matched with the high-speed rotary joint.

When turning the end face of the steering knuckle shaft, the first supporting seat and the second supporting seat are utilized to axially position the steering knuckle, and the hydraulic cylinder drives the pressing claw to press the steering knuckle for radial positioning. When the bottom side of the steering knuckle is milled, the steering knuckle is reversed (the steering knuckle shaft end faces opposite to the steering knuckle shaft end during milling), the steering knuckle is axially positioned by utilizing the first supporting seat and the second supporting seat, and the center positioning block is driven by the electric cylinder to move along the guide rail to clamp the steering knuckle shaft end, so that the steering knuckle is radially positioned.

Compared with the prior art, the knuckle turning and milling composite machining clamp has the following characteristics:

1. When similar parts are subjected to turning and milling combined processing, quick mold changing can be realized, the position of the angular positioning component is changed, multi-product compatibility can be realized, and the balancing weight is required to be adjusted to realize dynamic balance of the clamp during production changing.

2. The disc type structure is adopted, and the main shaft interface disc and the universal high-speed rotary joint can realize high-speed rotary motion and simultaneously greatly improve the compatibility of the clamp to different machine tools.

3. When the same steering knuckle is processed, the integrated processing of the workpiece can be realized only by adjusting the positioning element, so that the manufacturing cost of the clamp is greatly reduced, and the processing efficiency is improved.

4. The push rod is pushed by the hydraulic cylinder, so that the pressing claw is driven, and the quick and efficient positioning can be realized. The position of the center positioning block can be adjusted through the electric cylinder, so that the steering knuckle with different aperture sizes is compatible, and the flexibility is improved.

Drawings

FIG. 1 is a schematic view of the structure of a knuckle turning and milling composite machining fixture of the present utility model;

FIG. 2 is a schematic view of the connection of the spindle interface plate and the rotary union 19 of the present utility model;

FIG. 3 is a schematic view of a turning shaft end face of a steering knuckle mounted on a turning and milling composite machining fixture according to the present utility model;

FIG. 4 is a schematic view of the bottom side of the turning and milling composite machining fixture of the present utility model with a knuckle mounted thereon;

in the figure: 1. a chassis; 2. a base; 3. a counterweight device; 301. a center balancing weight; 302. an edge balancing weight; 4. an electric cylinder; 5. a guide rail; 6. a center positioning block; 7. a cover plate; 8. a hydraulic cylinder; 9. a push rod; 10. a pressing claw; 11. a bolt; 12. a hydraulic cylinder supporting seat; 13. a pin shaft; 14. a first support base; 15. a second support base; 16. a pin slot; 17. a spindle interface disc; 18. a cylindrical pin; 19. a high-speed rotary joint; 20. a bolt; 21. a knuckle; 211. the shaft end of the steering knuckle; 212. the bottom side of the knuckle spindle.

Detailed Description

The steering knuckle turning and milling composite machining clamp disclosed by the utility model, as shown in fig. 1, comprises a chassis 1, a base 2, a main shaft interface disc 17 and a high-speed rotary joint 19. One end surface of the chassis 1 is provided with a counterweight device 3, a base 2 and a hydraulic cylinder supporting seat 12 (see figure 1), the other end surface is provided with a main shaft interface disc 17 (see figure 2), and the main shaft interface disc 17 is connected with a high-speed rotary joint 19. The base 2 is positioned at the center of the chassis 1, and the counterweight device 3 and the hydraulic cylinder supporting seat 12 are respectively positioned at two sides of the base 2. A first supporting seat 14 and a second supporting seat 15 are symmetrically arranged between the counterweight device 3 and the base 2.

Referring to fig. 1, the counterweight device 3 is composed of a central counterweight 301 and edge counterweights 302, the central counterweight 301 is axisymmetrically fixed on the chassis 1, the number of the edge counterweights 302 is eight, and four are respectively fixed on the left side and the right side of the chassis 1, so that the dynamic balance of the clamp can be conveniently adjusted.

The first supporting seat 14 and the second supporting seat 15 are symmetrically fixed on the chassis 1 relative to the central axis of the chassis 1, and the upper ends of the first supporting seat and the second supporting seat are provided with limiting grooves and bolt holes which can be matched with the bolt holes of the steering knuckle 21 for axially positioning the steering knuckle 21.

Referring to fig. 1, a base 2 is fixed on a chassis 1, an electric cylinder 4 is mounted on the base 2, two guide rails 5 are mounted on the base 2 in an embedded manner, a center positioning block 6 is mounted on the guide rails 5, the center positioning block 6 is connected with a push rod of the electric cylinder 4, the center positioning block 6 can be driven to move along the guide rails 5 through the electric cylinder 4, clamping and loosening of a main shaft side during machining of the bottom side of a steering knuckle 21 can be achieved, and radial positioning of the steering knuckle is achieved. The base 2 is provided with a cover plate 7 for preventing the central positioning block 6 from axially displacing due to vibration, and the cover plate 7 is positioned above the central positioning block 6.

Referring to fig. 1, a cylinder support base 12 is fixed on the chassis 1, and two cylinders 8 are symmetrically installed on the cylinder support base 12 with respect to the central axis of the chassis 1. The output end (piston rod) of the hydraulic cylinder 8 is connected with a push rod 9, the push rod 9 is connected with a pressing claw 10 through a bolt 11, and the pressing claw 10 is hinged on a hydraulic cylinder supporting seat 12 through a pin shaft 13. The hydraulic cylinder 8 pushes the push rod 9, and the force on the push rod 9 acts on the pressing claw 10, so that the pressing claw 10 rotates downwards around the pin shaft 13 and presses on the steering knuckle 21, and therefore the clamping of the bottom side of the steering knuckle 21 can be used under the action of simultaneously pressing down the left and right side pressing claws 10, and the steering knuckle 21 is pressed on the chassis 1.

Referring to fig. 2, the spindle interface disc 17 is connected with the high-speed rotary joint 19, three bolt holes are formed in the bottom of the chassis 1 and the spindle interface disc 17, the high-speed rotary joint 19, the spindle interface disc 17 and the chassis 1 are connected together through bolts 20, and five cylindrical pins 17 are arranged on the spindle interface disc 17 and can be matched with pin grooves 16 on the high-speed rotary joint 19.

The above-described jig realizes a process of turning and milling composite machining of the knuckle 21 as follows.

1. Turning the shaft end of knuckle 21

When the shaft end 211 of the knuckle 21 is turned, as shown in fig. 3, two bolt holes on the knuckle 21 are respectively placed on the first support seat 14 and the second support seat 15, so that the axial positioning of the knuckle 21 is realized. The two hydraulic cylinders 8 are started to enable the two pressing claws 10 to press downwards, so that the knuckle 21 is pressed tightly.

The high-speed adapter 19 is connected with a machine tool spindle, the machine tool spindle drives the high-speed adapter 19 to rotate, and the high-speed adapter 19 drives the chassis 1 and the steering knuckle 21 clamped on the chassis 1 to rotate through the spindle interface disc 17, so that the turning of the shaft end 211 of the steering knuckle 21 is realized.

2. Milling the underside of the knuckle 21

When milling the bottom side 212 of the knuckle 21, as shown in fig. 4, the shaft end of the knuckle 21 is located between the two center positioning blocks 6. Two bolt holes on the knuckle 21 are placed on the first support seat 14 and the second support seat 15, respectively, and are positioned axially by the first support seat 14 and the second support seat 15. The electric cylinder 4 is started to drive the two center positioning blocks 6to move along the guide rail 5, and the shaft ends of the steering knuckle 21 are positioned and clamped to realize radial positioning.

The high-speed adapter 19 is connected to the machine spindle, which is not rotated during milling.

Claims

1. The steering knuckle turning and milling composite machining clamp is characterized by comprising a chassis, a base, a main shaft interface disc and a high-speed rotary joint; a first supporting seat, a second supporting seat, a base and a hydraulic cylinder supporting seat are arranged on one end surface of the chassis, a main shaft interface disc is arranged on the other end surface of the chassis, and a high-speed rotary joint is connected to the main shaft interface disc; the base is provided with an electric cylinder and a guide rail, the guide rail is provided with a center positioning block, and the center positioning block is connected with a push rod of the electric cylinder; two hydraulic cylinders are oppositely installed on the hydraulic cylinder supporting seat, the output end of each hydraulic cylinder is connected with a push rod, and the push rods are connected with the pressing claws.

2. The knuckle turning and milling composite machining clamp according to claim 1, wherein the first supporting seat and the second supporting seat are symmetrically fixed on the chassis relative to the central axis of the chassis, and a limiting groove and a bolt hole matched with the bolt hole of the knuckle are formed in the upper end of the first supporting seat and the second supporting seat.

3. The knuckle turning and milling composite machining fixture of claim 1, wherein the base is located at a central portion of the chassis, and the first support seat and the second support seat are symmetrically arranged with respect to a central axis of the chassis.

4. The knuckle turning and milling composite machining clamp according to claim 1, wherein a counterweight device is arranged on the end face of a chassis where the base is located, and the counterweight device and the hydraulic cylinder supporting seat are respectively located on two sides of the base.

5. The knuckle turning and milling composite machining fixture of claim 4, wherein the weight means is comprised of a center weight and edge weights, the center weight being axisymmetrically fixed to the chassis, the edge weights being axisymmetrically distributed with respect to the center weight.

6. The knuckle turn-milling composite machining fixture of claim 1, wherein the rail is mounted in-line to the base.

7. The knuckle turning and milling composite machining fixture of claim 1, wherein a cover plate for preventing the center positioning block from axially displacing due to vibration is mounted on the base, and the cover plate is located above the center positioning block.

8. The knuckle turning compound machining fixture of claim 1, wherein the two hydraulic cylinders are symmetrical on a hydraulic cylinder support base with respect to a chassis central axis.

9. The knuckle turning and milling composite machining fixture of claim 1, wherein the spindle interface disc has cylindrical pins thereon that mate with a high speed swivel.