Positioning and machining fixture for steering knuckle

Abstract

The utility model discloses a kind of positioning machining clamps of steering elbow, it is related to steering elbow processing technical field, including pedestal, mounting seat, bearing seat, initiative frame, driven frame, bottom plate, pneumatic clamping module, single rod cylinder, double rod cylinder and driving motor, pneumatic clamping module is symmetrically installed at the top of bottom plate, including multiple sets of cylinder, clamping plate and other components, can multidirectional collaborative clamping steering elbow, cooperate the cylinder of bottom plate bottom end and form three-dimensional clamping.Driving motor can drive overall rotation, realize multi-angle processing.The positioning machining clamp, through multidirectional collaborative clamping design of pneumatic clamping module, can accurately adapt the irregular curved surface structure of steering elbow, effectively avoid positioning datum deviation, multiple cylinder balanced force can reduce workpiece micro deformation, substantially improve the pass rate of steering elbow's processing dimension precision, significantly improve product assembly accuracy.

Description

Technical Field

[0001] This utility model relates to the field of steering arm machining technology, and in particular to a steering arm positioning and machining fixture. Background Technology

[0002] In automotive steering systems, the steering arm, as a key component for transmitting steering forces, directly affects vehicle steering stability and driving safety in terms of machining accuracy. Currently, the machining of steering arms largely relies on traditional fixtures for positioning and fixing, but this has significant technical limitations:

[0003] Traditional fixtures typically use unidirectional clamping, which is difficult to adapt to the irregular curved surface structure of steering arms. This leads to positioning datum misalignment, resulting in out-of-tolerance dimensional accuracy of the machined products and a low pass rate. During clamping, rigid contact can easily cause scratches on the workpiece surface, and uneven distribution of clamping force can cause micro-deformation of the workpiece, affecting assembly accuracy. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a steering arm positioning and machining fixture.

[0005] This utility model proposes a steering arm positioning and machining fixture, including a base. A mounting seat and a bearing seat are symmetrically mounted on the top of the base. Adjacent surfaces of the mounting seat and bearing seat are rotatably connected to an active frame and a driven frame. The bottom ends of the active frame and driven frame are connected to a base plate. A pneumatic clamping module is symmetrically mounted on the top of the base plate, clamping and fixing the steering arm. A single-rod cylinder is symmetrically mounted on the bottom of the base plate, and a double-rod cylinder corresponding to the single-rod cylinder is mounted in the middle of the bottom of the base plate. A drive motor connected to the active frame is mounted on the side of the mounting seat. The pneumatic clamping module, single-rod cylinder, and double-rod cylinder together clamp and fix the steering arm. The drive motor drives the active frame, driven frame, base plate, pneumatic clamping module, and steering arm to rotate synchronously as a whole.

[0006] Furthermore, the pneumatic clamping module includes a support base mounted on the top of the base plate, and a first clamping cylinder is installed inside the support base. The telescopic end of the first clamping cylinder is connected to a first clamping plate.

[0007] Furthermore, a number of buffer protrusions are installed on the end of the first clamping plate facing the first clamping cylinder, and the buffer protrusions are components made of rubber.

[0008] Furthermore, a cone and a second clamping cylinder are respectively installed in the middle part of the support base to abut against the surface of the steering arm.

[0009] Furthermore, a third clamping cylinder is installed on the side of the support base. The telescopic end of the third clamping cylinder is rotatably connected to the second clamping plate. The second clamping plate and the housing of the third clamping cylinder are rotatably connected by a hinge seat.

[0010] Furthermore, the second clamping plate is configured with a "Z" shaped structure, and an arc-shaped hole is opened at the end of the second clamping plate that connects to the telescopic end of the third clamping cylinder. A pin hole is opened at the telescopic end of the third clamping cylinder, and a pin shaft is connected inside the arc-shaped hole and the pin hole.

[0011] The beneficial effects of this utility model are as follows: Through the multi-directional collaborative clamping design of the pneumatic clamping module, it can accurately adapt to the irregular curved surface structure of the steering arm, effectively avoid the offset of the positioning reference, and the balanced force of multiple cylinders can reduce the micro deformation of the workpiece, greatly improve the pass rate of the machining dimensional accuracy of the steering arm, and significantly improve the product assembly accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the disassembled structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the pneumatic clamping module in this utility model;

[0014] Figure 3 This is a top view of the pneumatic clamping module in this utility model;

[0015] Figure 4 This is a schematic diagram of the pneumatic clamping module for clamping and fixing the steering arm in this utility model;

[0016] Figure 5 This is a first-view structural diagram of the present invention after assembly;

[0017] Figure 6 This is a structural schematic diagram of the present invention from a second perspective after assembly.

[0018] In the diagram: 1. Base; 2. Mounting seat; 3. Bearing seat; 4. Driving frame; 5. Driven frame; 6. Base plate; 61. Clearance hole; 7. Pneumatic clamping module; 71. Support seat; 72. First clamping cylinder; 73. First clamping plate; 74. Buffer protrusion; 75. Abutment cone; 76. Second clamping cylinder; 77. Third clamping cylinder; 78. Hinge seat; 79. Second clamping plate; 710. Arc-shaped hole; 711. Pin; 8. Steering arm; 9. Single-rod cylinder; 10. Double-rod cylinder; 11. Drive motor. Detailed Implementation

[0019] Reference Figure 1-6This utility model proposes a steering arm positioning and machining fixture, aiming to solve the problems of insufficient positioning accuracy, poor clamping stability, and difficulty in achieving synchronous rotational machining of steering arms by traditional fixtures. Through the coordinated design of the base 1, mounting base 2, bearing seat 3, driving frame 4, driven frame 5, base plate 6, pneumatic clamping module 7, single-rod cylinder 9, double-rod cylinder 10, and drive motor 11, precise positioning, secure clamping, and synchronous rotational machining of the steering arm 8 are achieved, meeting the requirements of high-efficiency and high-precision machining. The specific technical solution is as follows:

[0020] Mounting base 2 and bearing housing 3 are symmetrically mounted on the top of base 1. The materials of both are compatible with the base to ensure structural strength. Mounting base 2 is used to support drive motor 11 and connect drive frame 4, while bearing housing 3 is rotatably connected to driven frame 5. They are connected to base 1 by bolts and other fasteners. During the connection process, the installation accuracy must be strictly controlled to ensure the parallelism, coaxiality and other form and position tolerances of the two, so as to ensure the smooth rotation of drive frame 4 and driven frame 5.

[0021] The active frame 4 is rotatably connected to the adjacent surface of the mounting base 2, and the driven frame 5 is rotatably connected to the adjacent surface of the bearing seat 3. One end of the active frame 4 is connected to the output shaft of the drive motor 11, and the stability and coaxiality of the power transmission can be ensured by means of couplings, etc., and the other end is connected to the bottom end of the base plate 6. One end of the driven frame 5 is connected to the bottom end of the base plate 6, and the other end is connected to the bearing seat 3 through rotating parts such as bearings, so that the active frame 4 and the driven frame 5 can drive the base plate 6 and subsequent components to rotate synchronously.

[0022] The top of the base plate 6 is used to install the pneumatic clamping module 7. The positional accuracy of the pneumatic clamping module 7 after installation must be ensured to ensure accurate clamping of the steering arm 8. Single-rod cylinders 9 are symmetrically installed at the bottom and double-rod cylinders 10 are installed in the middle. The cylinders are fixed to the base plate 6 by means of hinge or bolt connection, so that the extension and retraction of the cylinders can effectively act on the clamping and positioning of the steering arm 8.

[0023] The pneumatic clamping module 7 is the core component for accurately clamping the steering arm 8. It is symmetrically installed on the top of the base plate 6 and includes a support base 71, a first clamping cylinder 72, a first clamping plate 73, a buffer protrusion 74, a stop cone 75, a second clamping cylinder 76, a third clamping cylinder 77, a hinge base 78, a second clamping plate 79, an arc-shaped hole 710, and a pin 711. The specific structure and connection of each part are as follows:

[0024] The support base 71 is fixed to the top of the base plate 6. It has an installation chamber inside to accommodate components such as the first clamping cylinder 72. It has installation interfaces on the side and middle to fix the abutment cone 75, the second clamping cylinder 76, the third clamping cylinder 77, etc., to ensure that the position of each component is stable after installation and to work together to achieve the clamping function.

[0025] The first clamping cylinder 72 is installed in the mounting chamber inside the support base 71. Its telescopic end is connected to the first clamping plate 73, which can drive the first clamping plate 73 to move closer to or away from the steering arm 8 to achieve the clamping action. The selection of the cylinder needs to take into account parameters such as clamping force and stroke to adapt to the size of the steering arm 8 and the clamping requirements.

[0026] The first clamping plate 73 is connected to the telescopic end of the first clamping cylinder 72. A buffer protrusion 74 can be installed on the side facing the steering arm 8. Its shape and size are adapted to the shape of the steering arm 8 to ensure full contact with the workpiece surface during clamping and provide a stable clamping force.

[0027] The buffer protrusion 74 is made of elastic materials such as rubber. During the clamping process, it can play a buffering role to avoid hard contact between the first clamping plate 73 and the steering arm 8, which would cause damage to the workpiece surface, and at the same time enhance the stability of clamping.

[0028] The abutment cone 75 and the second clamping cylinder 76 are both installed in the middle of the support base 71. The telescopic ends of the abutment cone 75 and the second clamping cylinder 76 work together to abut against the surface of the steering arm 8 from different directions, assisting in the positioning and clamping of the workpiece, so that the steering arm 8 is in a relatively stable position before clamping.

[0029] The third clamping cylinder 77 is installed on the side of the support base 71. Its housing is welded or bolted to the hinge base 78. The second clamping plate 79 is rotatably connected to the hinge base 78 through the pin 711. At the same time, the second clamping plate 79 and the extension end of the third clamping cylinder 77 are movably connected through the pin 711 passing through the arc-shaped hole 710 and the pin hole. The second clamping plate 79 is designed with a "Z" shaped structure. The arc-shaped hole 710 allows it to rotate flexibly around the hinge base 78 when the third clamping cylinder 77 extends and retracts, clamping the steering arm 8 from the side. It works in conjunction with the first clamping cylinder 72, etc., to form a multi-directional and stable clamping force.

[0030] Single-rod cylinder 9 is symmetrically installed at the bottom end of base plate 6, and double-rod cylinder 10 is installed at the middle of the bottom end of base plate 6. The extension and retraction ends of the two cylinders work together to act on the bottom end of steering arm 8. During operation, single-rod cylinder 9 and double-rod cylinder 10 work together to apply force to steering arm 8 from below base plate 6, assisting pneumatic clamping module 7 in firmly clamping steering arm 8 and preventing steering arm 8 from shifting during processing.

[0031] Work process:

[0032] After the steering arm 8 to be processed is placed in the corresponding position of the pneumatic clamping module 7, its surface first makes initial contact with the abutment cone 75 to achieve pre-positioning. At this time, the first clamping cylinder 72, the third clamping cylinder 77 in the pneumatic clamping module 7, and the single-rod cylinder 9 and double-rod cylinder 10 at the bottom of the base plate 6 are activated simultaneously. The telescopic end of the first clamping cylinder 72 drives the first clamping plate 73 to move closer to the steering arm 8. The rubber buffer protrusion 74 first contacts the workpiece surface and generates elastic deformation, which avoids workpiece damage caused by hard contact and achieves initial front clamping through the reaction force generated by the deformation. The telescopic end of the third clamping cylinder 77 extends and retracts simultaneously. Since the second clamping plate 79 is connected to the cylinder through the arc-shaped hole 710 and the pin 711, the extension and retraction of the cylinder is also affected. The first clamping plate 79, with its movable end connection and rotatable connection to the cylinder housing via the hinge seat 78, rotates synchronously around the hinge point, forming a clamping force on the steering arm 8 from the side, which, together with the first clamping plate 73, forms a lateral clamping force. At the same time, the telescopic end of the second clamping cylinder 76 extends synchronously, which, together with the abutment cone 75, forms a pressing force on the surface of the steering arm 8 from both sides, further restricting the horizontal displacement of the workpiece. The single-rod cylinder 9 and double-rod cylinder 10 at the bottom of the base plate 6 also extend upward synchronously, applying an upward pressing force to the support point of the steering arm 8 from the bottom, forming a three-dimensional clamping system with the clamping force of the pneumatic clamping module 7. Through the synergistic effect of multi-directional forces, the steering arm 8 is firmly fixed in the preset processing position.

[0033] Once the steering arm 8 is fully clamped and fixed, the drive motor 11 starts, and its output shaft drives the active frame 4 to rotate through the coupling. The active frame 4 drives the driven frame 5 to rotate synchronously through the rigid connection of the base plate 6, thereby causing the base plate 6, the pneumatic clamping module 7, and the clamped steering arm 8 to rotate synchronously as a whole. During the rotation, it cooperates with external processing equipment to complete the processing steps of the steering arm 8 at different angles and positions. After processing, all cylinders move in opposite directions synchronously. The first clamping cylinder 72 drives the first clamping plate 73 to retract, and the third clamping cylinder 77 drives the second clamping plate 79 to rotate in the opposite direction to release the side. The single-rod cylinder 9 and the double-rod cylinder 10 retract synchronously to release the bottom clamping, and the clamping state of the steering arm 8 is released. At this time, the drive motor 11 drives the entire clamping system to reset to the initial angle, and the processed steering arm 8 can be taken out, completing one processing cycle.

[0034] It should be noted that during the processing, the rotation range of the drive motor 11 driving the steering arm 8 is 0-90°, so the air pipes connecting the air source of each cylinder will not get tangled. In addition, the drive motor 11 is a servo motor and has a self-locking function, which is a well-known technology and will not be described in detail here.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A steering arm positioning and machining fixture, comprising a base (1), characterized in that, The top of the base (1) is symmetrically equipped with a mounting base (2) and a bearing seat (3). The adjacent surfaces of the mounting base (2) and the bearing seat (3) are rotatably connected to the drive frame (4) and the driven frame (5). The bottom ends of the drive frame (4) and the driven frame (5) are connected to the base plate (6). The top of the base plate (6) is symmetrically equipped with a pneumatic clamping module (7), which clamps and fixes the steering arm (8). The bottom end of the base plate (6) is symmetrically equipped with a single-rod cylinder (9). Furthermore, a double-rod cylinder (10) corresponding to the single-rod cylinder (9) is installed in the middle of the bottom end of the base plate (6), and a drive motor (11) connected to the active frame (4) is installed on the side of the mounting base (2). The pneumatic clamping module (7), the single-rod cylinder (9), and the double-rod cylinder (10) together clamp and fix the steering arm (8). The drive motor (11) drives the active frame (4), the driven frame (5), the base plate (6), the pneumatic clamping module (7), and the steering arm (8) to rotate synchronously as a whole.

2. The steering arm positioning and machining fixture according to claim 1, characterized in that, The pneumatic clamping module (7) includes a support base (71) installed on the top of the base plate (6), and a first clamping cylinder (72) is installed inside the support base (71). The telescopic end of the first clamping cylinder (72) is connected to a first clamping plate (73).

3. The steering arm positioning and machining fixture according to claim 2, characterized in that, The first clamping plate (73) has several buffer protrusions (74) installed at the end facing the first clamping cylinder (72), and the buffer protrusions (74) are made of rubber.

4. The steering arm positioning and machining fixture according to claim 2, characterized in that, The middle part of the support base (71) is respectively equipped with a cone (75) and a second clamping cylinder (76) to abut against the surface of the steering arm (8).

5. The steering arm positioning and machining fixture according to claim 2, characterized in that, A third clamping cylinder (77) is installed on the side of the support base (71). The telescopic end of the third clamping cylinder (77) is rotatably connected to the second clamping plate (79). The second clamping plate (79) and the housing of the third clamping cylinder (77) are rotatably connected by a hinge seat (78).

6. The steering arm positioning and machining fixture according to claim 5, characterized in that, The second clamping plate (79) is configured with a "Z" shaped structure. An arc-shaped hole (710) is opened at the end of the second clamping plate (79) that is connected to the telescopic end of the third clamping cylinder (77). A pin hole is opened at the telescopic end of the third clamping cylinder (77). The arc-shaped hole (710) and the pin hole are connected together to the pin shaft (711).

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