A workpiece machining fixture

Abstract

This utility model discloses a workpiece machining fixture, including a tooling, a steering knuckle workpiece placed on top of the tooling, a connecting block fixedly connected to the front of the tooling, and jaws movably connected to both sides of the connecting block via pins. The jaws extend from the side away from the connecting block to the top of the steering knuckle workpiece and contact its surface. An adjustment structure is provided at the bottom of the tooling, which controls the movement of the jaws and clamps the steering knuckle workpiece. The adjustment structure includes a connecting frame fixedly connected to the bottom of the tooling, a screw movably connected inside the connecting frame via bearings, and a threaded sleeve threaded to the surface of the screw. Push rods are fixedly connected to both sides of the threaded sleeve. This utility model achieves the rotational clamping action of the jaws through the pin connection between the connecting block and the jaws, forming a radial constraint force. The mechanical linkage of the adjustment structure replaces direct bolt locking, preventing the threaded pair from loosening due to vibration.

Description

Technical Field

[0001] This utility model relates to the field of steering knuckle processing technology, specifically a workpiece processing fixture. Background Technology

[0002] The steering knuckle is a key component of the automotive suspension system, mainly connecting the wheels, steering system, and braking system. It is crucial to the vehicle's handling and safety, and requires fixtures to fix it during the manufacturing process to ensure its precision.

[0003] For example, patent application number 201920480644.3 published on the China Patent Network, entitled "Automotive Steering Knuckle Fixing Fixture," includes a base with a boss in the middle. A positioning shaft and a fixing seat are symmetrically arranged on both sides of the boss. A pressure block is provided at the end of the positioning shaft to fix the steering knuckle disc to the outside of the positioning shaft. The pressure block is fixedly connected to the positioning shaft by bolts. The fixing seat is provided with a pawl for fixing the outer side of the long lug of the steering knuckle and a pin for fixing the inner side of the long lug. The positioning shaft is inserted into the inner hole of the steering knuckle disc. Rotating the bolts and pressure block fixes the disc, while the pawl and pin fix the long lug end, thus fixing the entire steering knuckle. Then, both ends of the base are fixed to a machine tool spindle. The rotation of the spindle causes the base to rotate by a certain angle, thereby rotating the steering knuckle by a certain angle, facilitating multi-angle machining of the steering knuckle. This utility model reduces the number of processing equipment, simplifies processing steps, and improves production efficiency.

[0004] However, the positioning method of existing fixtures is relatively simple, mainly relying on bolt compression for fixation. During the processing, the bolts are prone to loosening due to mechanical vibration, which can cause displacement of the clamped steering knuckle and affect its processing effect.

[0005] Therefore, it is necessary to design and modify the workpiece machining fixture. Utility Model Content

[0006] To address the problems mentioned in the background art, the purpose of this utility model is to provide a workpiece machining fixture that has the advantage of improved fixing stability. It solves the problem that the positioning method of existing fixtures is relatively simple, mainly relying on bolt compression for fixing. During the machining process, the bolts are prone to loosening due to mechanical vibration, which leads to displacement of the clamped steering knuckle and affects its machining effect.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a workpiece machining fixture, including tooling;

[0008] The steering knuckle workpiece placed on top of the tooling;

[0009] A connecting block is fixedly connected to the front of the tooling. Both sides of the connecting block are movably connected to jaws via pins. The side of the jaws away from the connecting block extends to the top of the steering knuckle workpiece and contacts the surface of the steering knuckle workpiece. An adjustment structure is provided at the bottom of the tooling. The adjustment structure can control the movement of the jaws and clamp the steering knuckle workpiece.

[0010] In a preferred embodiment of this utility model, the adjusting structure includes a connecting frame fixedly connected to the bottom of the tooling. A screw is movably connected inside the connecting frame via a bearing. A threaded sleeve is threaded onto the surface of the screw. Push rods are fixedly connected to both sides of the threaded sleeve. A force-bearing rod is fixedly connected to the outer side of the chuck via a pin. The force-bearing rod extends from the side away from the chuck to the front side of the push rod. When the screw rotates, it can use the thread to push the threaded sleeve and push rod forward and squeeze the force-bearing rod. A rotating wheel is fixedly connected to the front end of the screw.

[0011] In a preferred embodiment of this invention, the side of the push rod away from the threaded sleeve is movably connected to a roller via a pin, and the outer surface of the roller is in contact with the surface of the force-bearing rod.

[0012] In a preferred embodiment of this invention, a sleeve plate is fixedly connected to the surface of the chuck, and an insertion rod is provided on the inner side of the sleeve plate. The rear end of the insertion rod extends into the interior of the steering knuckle workpiece and is inserted into the steering knuckle workpiece. Sliding rods located inside the sleeve plate are fixedly connected to both sides of the insertion rod, and the sliding rods are slidably connected to the sleeve plate.

[0013] As a preferred embodiment of this utility model, a limiting tube is fixedly connected to the top of the connecting block, and the limiting tube is sleeved on the surface of the plug rod and slidably connected to the plug rod.

[0014] As a preferred embodiment of this utility model, the bottom of the tooling is provided with a push rod, the top end of the push rod penetrates through the tooling and contacts the bottom of the steering knuckle workpiece, the bottom of the push rod is fixedly connected to a trapezoidal block, the trapezoidal block is located at the top of the threaded sleeve and is slidably connected to the threaded sleeve, and the bottom of the trapezoidal block is set to be inclined.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model achieves the rotational clamping action of the jaws by connecting the connecting block and the jaws with a pin, forming a radial constraint force. The mechanical linkage of the adjustment structure replaces the direct locking of bolts, avoiding the loosening of the threaded pair due to vibration.

[0017] 2. This utility model converts rotational torque into linear thrust through a screw and screw sleeve transmission mechanism. A single screw drives the push rods on both sides to move synchronously, ensuring that the clamping force of the jaws on both sides is balanced.

[0018] 3. This utility model converts sliding friction into rolling friction through rollers. The rollers ensure that the contact pressure between the push rod and the force rod is evenly distributed, thus preventing the pawl from jamming.

[0019] 4. This utility model achieves secondary positioning by engaging the plug rod with the pre-drilled hole in the workpiece. The sliding rod slides within the sleeve, allowing for position compensation of the plug rod. Furthermore, the engagement of the plug rod with the hole forms a circumferential constraint, thereby improving the ability to resist machining torque.

[0020] 5. This utility model constrains the movement trajectory of the plug rod by limiting the tube, preventing lateral sway. The limiting tube and the plug rod form a composite beam structure, which improves the bending stiffness.

[0021] 6. This utility model converts the horizontal movement of the threaded sleeve into the vertical lifting of the push rod by using the inclined surface of the trapezoidal block, thereby forming an axial clamping force. The angle design of the inclined surface meets the self-locking condition and prevents the push rod from retracting due to processing reaction force. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the left-side structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of this utility model from below;

[0025] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0026] In the diagram: 1. Tooling; 2. Steering knuckle workpiece; 3. Connecting block; 4. Claw; 5. Adjustment structure; 6. Connecting frame; 7. Screw; 8. Screw sleeve; 9. Push rod; 10. Force-bearing rod; 11. Rotary wheel; 12. Roller; 13. Sleeve plate; 14. Insert rod; 15. Slide rod; 16. Limiting tube; 17. Top rod; 18. Trapezoidal block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1 to 4 As shown, the present invention provides a workpiece machining fixture, including tooling 1;

[0029] Steering knuckle workpiece 2 placed on top of tooling 1;

[0030] The tooling 1 is fixedly connected to the front of the connecting block 3. Both sides of the connecting block 3 are movably connected to the jaws 4 via pins. The side of the jaws 4 away from the connecting block 3 extends to the top of the steering knuckle workpiece 2 and contacts the surface of the steering knuckle workpiece 2. The bottom of the tooling 1 is provided with an adjustment structure 5. The adjustment structure 5 can control the movement of the jaws 4 and clamp the steering knuckle workpiece 2.

[0031] refer to Figure 3 The adjusting structure 5 includes a connecting frame 6 fixedly connected to the bottom of the tooling 1. A screw 7 is movably connected inside the connecting frame 6 via a bearing. A screw sleeve 8 is threadedly connected to the surface of the screw 7. Push rods 9 are fixedly connected to both sides of the screw sleeve 8. A force-bearing rod 10 is fixedly connected to the outside of the pawl 4 via a pin. The side of the force-bearing rod 10 away from the pawl 4 extends to the front side of the push rod 9. When the screw 7 rotates, it can use the thread to push the screw sleeve 8 and the push rod 9 forward and squeeze the force-bearing rod 10. A rotating wheel 11 is fixedly connected to the front end of the screw 7.

[0032] As a technical optimization of this utility model, the rotational torque is converted into linear thrust through the transmission mechanism of screw 7 and screw sleeve 8. The single screw 7 drives the double push rods 9 to move synchronously, ensuring that the clamping force of the claws 4 on both sides is balanced.

[0033] refer to Figure 2 The push rod 9 is movably connected to a roller 12 via a pin on the side away from the screw sleeve 8, and the outer surface of the roller 12 is in contact with the surface of the force rod 10.

[0034] As a technical optimization of this utility model, the sliding friction is converted into rolling friction by the roller 12. The roller 12 makes the contact pressure between the push rod 9 and the force rod 10 evenly distributed, thus avoiding the jamming of the pawl 4.

[0035] refer to Figure 1 A sleeve plate 13 is fixedly connected to the surface of the claw 4. A plug-in rod 14 is provided on the inner side of the sleeve plate 13. The rear end of the plug-in rod 14 extends into the interior of the steering knuckle workpiece 2 and plugs into the steering knuckle workpiece 2. Both sides of the plug-in rod 14 are fixedly connected to slide rods 15 located inside the sleeve plate 13. The slide rods 15 are slidably connected to the sleeve plate 13.

[0036] As a technical optimization of this utility model, secondary positioning is achieved by the insertion rod 14 cooperating with the pre-made hole of the workpiece. The sliding rod 15 slides within the sleeve plate 13 to allow position compensation of the insertion rod 14. Moreover, the insertion rod 14 and the hole cooperate to form a circumferential constraint, which improves the ability to resist machining torque.

[0037] refer to Figure 3 The top of the connecting block 3 is fixedly connected to the limiting tube 16, which is sleeved on the surface of the plug rod 14 and slidably connected to the plug rod 14.

[0038] As a technical optimization of this utility model, the movement trajectory of the plug-in rod 14 is constrained by the limiting tube 16 to prevent lateral swaying. The limiting tube 16 and the plug-in rod 14 form a composite beam structure, which improves the bending stiffness.

[0039] refer to Figure 4 The bottom of the tooling 1 is provided with a push rod 17. The top end of the push rod 17 passes through the tooling 1 and contacts the bottom of the steering knuckle workpiece 2. The bottom of the push rod 17 is fixedly connected to a trapezoidal block 18. The trapezoidal block 18 is located on the top of the threaded sleeve 8 and is slidably connected to the threaded sleeve 8. The bottom of the trapezoidal block 18 is set to be inclined.

[0040] As a technical optimization of this utility model, the horizontal movement of the screw sleeve 8 is converted into the vertical lifting of the push rod 17 by the inclined surface of the trapezoidal block 18, forming an axial clamping force. The angle design of the inclined surface meets the self-locking condition to prevent the push rod 17 from retracting due to the processing reaction force.

[0041] The working principle and usage process of this utility model are as follows: The operator places the steering knuckle workpiece 2 vertically on the top of the fixture 1, and achieves initial positioning through the platform of the fixture 1. Under its own weight, the bottom trapezoidal block 18 of the push rod 17 contacts the threaded sleeve 8, and the top of the push rod 17 presses against the bottom of the workpiece to form a vertical foundation support. Then, the rotating wheel 11 drives the screw 7 to rotate, and the threaded transmission causes the threaded sleeve 8 to move axially along the screw 7. When the threaded sleeve 8 moves forward, it pushes the push rods 9 on both sides to move forward synchronously. The roller 12 at the front end of the push rod 9 rolls along the surface of the force-bearing rod 10, converting linear motion into rotational torque. The force-bearing rod 10 pushes the push rod 9... The thrust is transmitted to the jaw 4, forcing the jaw 4 to rotate around the pin of the connecting block 3. The jaws 4 on both sides form a symmetrical clamping action, and their inner curved surfaces gradually press against the outer contour of the steering knuckle workpiece 2. While the jaw 4 swings, the sleeve 13 moves synchronously with the jaw 4, driving the insertion rod 14 to insert into the pre-drilled hole of the workpiece to achieve precise positioning. When the screw 7 continues to rotate, the screw sleeve 8 pushes the trapezoidal block 18 to generate a slope effect, causing the top rod 17 to press upward against the bottom of the workpiece, thus forming a "three-point compound clamping" solution: radial clamping force of the jaw 4 + positioning force of the insertion rod 14 + axial pressing force of the top rod 17.

[0042] In summary: This workpiece machining fixture, through the connection of the connecting block 3 and the pin of the jaw 4, realizes the rotation clamping action of the jaw 4, forming a radial constraint force. The mechanical linkage of the adjusting structure 5 replaces the direct locking of the bolt, avoiding the loosening of the threaded pair due to vibration.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A workpiece machining fixture, comprising tooling (1); Steering knuckle workpiece (2) placed on top of tooling (1); Its features are: The tooling (1) is fixedly connected to a connecting block (3) on the front side. Both sides of the connecting block (3) are movably connected to a chuck (4) via a pin. The chuck (4) extends to the top of the steering knuckle workpiece (2) on the side away from the connecting block (3) and contacts the surface of the steering knuckle workpiece (2). The tooling (1) is provided with an adjustment structure (5) at the bottom. The adjustment structure (5) can control the movement of the chuck (4) and clamp the steering knuckle workpiece (2).

2. The workpiece machining fixture according to claim 1, characterized in that: The adjustment structure (5) includes a connecting frame (6) fixedly connected to the bottom of the tooling (1). A screw (7) is movably connected inside the connecting frame (6) via a bearing. A threaded sleeve (8) is threaded onto the surface of the screw (7). Push rods (9) are fixedly connected to both sides of the threaded sleeve (8). A force rod (10) is fixedly connected to the outer side of the pawl (4) via a pin. The force rod (10) extends from the side away from the pawl (4) to the front side of the push rod (9). When the screw (7) rotates, it can use the thread to push the threaded sleeve (8) and the push rod (9) forward and squeeze the force rod (10). A rotating wheel (11) is fixedly connected to the front end of the screw (7).

3. The workpiece machining fixture according to claim 2, characterized in that: The push rod (9) is movably connected to a roller (12) via a pin on the side away from the screw sleeve (8), and the outer surface of the roller (12) is in contact with the surface of the force rod (10).

4. A workpiece machining fixture according to claim 2, characterized in that: A sleeve plate (13) is fixedly connected to the surface of the claw (4). A plug-in rod (14) is provided on the inner side of the sleeve plate (13). The rear end of the plug-in rod (14) extends into the interior of the steering knuckle workpiece (2) and plugs into the steering knuckle workpiece (2). Both sides of the plug-in rod (14) are fixedly connected to sliding rods (15) located inside the sleeve plate (13). The sliding rods (15) are slidably connected to the sleeve plate (13).

5. A workpiece machining fixture according to claim 4, characterized in that: The top of the connecting block (3) is fixedly connected to a limiting tube (16), which is sleeved on the surface of the plug rod (14) and slidably connected to the plug rod (14).

6. A workpiece machining fixture according to claim 2, characterized in that: The tooling (1) is provided with a push rod (17) at the bottom. The top end of the push rod (17) passes through the tooling (1) and contacts the bottom of the steering knuckle workpiece (2). A trapezoidal block (18) is fixedly connected to the bottom of the push rod (17). The trapezoidal block (18) is located at the top of the threaded sleeve (8) and is slidably connected to the threaded sleeve (8). The bottom of the trapezoidal block (18) is set to be inclined.

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