A floating mechanism for hub hardness detection

Abstract

The utility model relates to the field of aluminum alloy wheel hub manufacturing, and disclose a kind of floating mechanism for wheel hub hardness detection, to solve the perpendicularity difficult guarantee in existing wheel hub hardness detection, probe is vulnerable, poor adaptability and other problems.The mechanism includes positioning disc, locating post, floating assembly and mechanical arm execution end, positioning disc front end is fixed with several equal height locating post, hardness gauge is vertically installed in positioning disc and probe detection axis is coplanar perpendicular with locating post vertex;Positioning disc is connected with mechanical arm execution end by floating assembly, and floating assembly contains mounting seat and elastomer, realize the floating connection of positioning disc.Detection, locating post is preferentially contacted with wheel hub to be detected inclined plane, and elastomer deformation makes locating post self-adapting to ensure that probe and measured surface are perpendicular, without external auxiliary equipment.The utility model is simple in structure, cost controllable, adapts to different wheel type, detection precision and efficiency are high, probe loss is small, and the ability of resisting workshop environmental interference is strong, suitable for wheel hub 100% full inspection batch production scene.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy wheel manufacturing, and in particular to a floating mechanism for wheel hardness testing. Background Technology

[0002] In the aluminum alloy wheel manufacturing industry, the mechanical properties of a product are a core indicator determining its quality. Hardness testing, as a crucial means of measuring mechanical properties, directly impacts product qualification and market access. The hardness testing area for wheel hubs is typically an inclined surface with a certain angle, and the perpendicularity of the hardness tester probe to the tested surface directly determines the accuracy of the test data. Existing technologies for hardness testing have significant shortcomings: First, using fixed-angle probes cannot adapt to the size differences of different wheel types, leading not only to perpendicularity deviations and inaccurate data but also to potential damage to the probe due to hard contact. Second, some solutions rely on visual or external auxiliary equipment to correct perpendicularity, which is costly and unstable due to workshop dust and vibration. Third, existing technologies struggle to balance accuracy, speed, and stability, failing to meet the demands of 100% full inspection for mass production of wheel hubs, resulting in a mismatch between testing efficiency and production capacity.

[0003] Therefore, there is an urgent need for a hardness testing mechanism with a simple structure and controllable cost to solve the problems mentioned above, such as difficulty in ensuring perpendicularity, easy damage to the probe, and poor adaptability, so as to achieve efficient and accurate testing of wheel hub hardness. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a floating mechanism for wheel hub hardness testing, thereby solving the problems of difficulty in ensuring verticality, easy damage to the probe, and poor adaptability in existing wheel hub hardness testing operations.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A floating mechanism for testing the hardness of wheel hubs includes a positioning disk for mounting a hardness tester. The front end of the positioning disk has several positioning posts of equal height fixedly arranged corresponding to the area of ​​the wheel hub to be tested. The housing of the hardness tester is fixedly connected to the positioning disk, and the test probe of the hardness tester extends vertically from the front end of the positioning disk. Its testing axis is coplanar and perpendicular to the apex of the positioning posts. The positioning disk is connected to the actuator of a robotic arm via a floating assembly. The floating assembly includes a mounting base fixedly connected to the rear end of the positioning disk, and the mounting base is floatingly connected to the actuator of the robotic arm via an elastic body.

[0007] Preferably, the elastic body is made of elastic bar material, and the axis of the elastic bar material is aligned with the vertical direction of the positioning disk; an elastic bolt is inserted inside the elastic bar material, and the elastic bolt sequentially passes through the connection hole of the robotic arm execution end, the elastic body and the mounting base, and the elastic bolt, the mounting base and the connection hole of the robotic arm execution end are all clearance fit.

[0008] Preferably, the elastic body is a compression spring. One end of the compression spring is fixed to the rear end face of the mounting base, and the other end is fixed to the actuator end of the robotic arm through a spring seat with a guide hole. The inner diameter of the guide hole of the spring seat is clearance-fitted with the outer diameter of the compression spring to limit the radial displacement of the compression spring.

[0009] Preferably, the front end of the contact head of the positioning post is provided with an annular dust guide groove, which can guide the dust adhering during contact into the groove for discharge, preventing dust accumulation from affecting the positioning fit.

[0010] Preferably, the annular dust guide groove has a depth of 0.5mm-1mm and a width of 0.8-1.5mm, and the annular dust guide groove is located 1-2mm away from the apex of the positioning post contact head.

[0011] Preferably, the cross-section of the annular dust guide groove is V-shaped, and the included angle of the groove opening is 45-60°.

[0012] Preferably, the front contact surface of the positioning post is coated with a wear-resistant coating to improve the wear resistance and hardness of the contact head.

[0013] The beneficial effects of this utility model are as follows:

[0014] This utility model provides a targeted solution to the technical problems in the background art, and has significant beneficial effects: Addressing the issues of poor adaptability, perpendicularity deviation, and easy damage of fixed-angle probes, it utilizes the coordinated design of floating components and positioning columns. The deformation of the elastic body enables the positioning column to adaptively adjust to the inclined surface of the wheel hub to be inspected, ensuring the probe is perpendicular to the surface being measured without manual intervention. Simultaneously, the elastic floating contact replaces rigid impact, effectively preventing probe damage. Furthermore, addressing the problems of high cost and susceptibility to environmental interference associated with reliance on vision or external auxiliary equipment, it eliminates the need for additional auxiliary equipment, achieving perpendicularity solely through a mechanical structure. Straightness correction significantly reduces equipment costs and maintenance burden, and can resist the impact of workshop dust and vibration on testing stability. Addressing the problem that existing technologies struggle to balance accuracy, speed, and stability, thus failing to meet the requirements of 100% inspection, the positioning column can adapt to the angle differences of the parts to be inspected for different wheel types, eliminating the need for special tooling adjustments and manufacturing steps, significantly shortening test preparation time, improving batch testing efficiency, and fully adapting to mass production scenarios requiring 100% inspection. In addition, the positioning column's annular dust guide groove and wear-resistant coating design further reduce dust interference, extend component life, and continuously ensure testing accuracy and mechanism reliability. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a structural diagram of the present invention in use.

[0018] Figure 3 This is a plan view of the present invention.

[0019] In the diagram: 10--Positioning plate; 11--Positioning column; 12--Annular dust guide groove; 13--Wear-resistant coating; 20--Floating component; 21--Mounting base; 22--Elastomer; 23--Elastic bolt; 30--Robotic arm actuator; 40--Hardness tester; Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] like Figure 1-3 As shown, a floating mechanism for testing the hardness of wheel hubs includes a positioning disk 10 for mounting a hardness tester 40. A plurality of positioning posts 11 of equal height are fixedly arranged on the front end face of the positioning disk 10 corresponding to the part of the wheel hub to be tested, ensuring that the vertices of the positioning posts 11 are coplanar and parallel to the front end face of the positioning disk 10. The housing of the hardness tester 40 is fixedly connected to the positioning disk 10, and the probe of the hardness tester 40 extends vertically from the front end face of the positioning disk 10, with its detection axis perpendicular to the coplanar vertices of the positioning posts 11. The positioning disk 10 is connected to the actuator end 30 of a robotic arm via a floating assembly 20. The floating assembly 20 includes a mounting base 21 fixedly connected to the rear end face of the positioning disk 10, and the mounting base 21 is floatingly connected to the actuator end 30 of the robotic arm via an elastic body 22.

[0022] During testing, such as Figure 2As shown, the robotic arm execution end 30 drives the positioning disk 10 along the preset detection path toward the part of the wheel hub to be tested. The positioning pins 11 on the positioning disk 10 first contact the part of the wheel hub to be tested. The robotic arm continues to move, and the reaction force of the part to be tested pushes the mounting seat 21 to squeeze the elastic body 22, and the elastic body 22 produces a certain degree of elastic deformation. During this process, the positioning pins 11 can adaptively adjust their posture according to the angle of the wheel hub's inclined surface, ultimately ensuring that the tops of no less than three positioning pins 11 are in contact with the surface of the part to be tested (satisfying the "three points coplanar" principle of surface positioning), so that the coplanarity of the vertices of the positioning pins 11 completely coincides with the surface of the part to be tested, thereby achieving precise surface positioning of the positioning disk 10 and ensuring that the detection axis of the hardness tester 40 probe is strictly perpendicular to the surface of the part to be tested. At this time, the hardness tester 40 probe starts and acts perpendicularly on the part of the wheel hub to be tested, performing hardness testing.

[0023] This embodiment replaces the rigid connection method in the prior art with a floating component 20, eliminating the need for vision or external auxiliary equipment and avoiding the drawbacks of such equipment, such as high cost and susceptibility to workshop dust and vibration. Through the deformation of the elastic body 22 and the adaptive fit of the positioning post 11, the verticality of the probe is automatically corrected. At the same time, the elastic floating contact replaces the rigid impact, effectively avoiding mechanical damage to the probe and the wheel hub. In addition, for the different tilt angles of the parts to be inspected for different wheel types, the positioning post 11 can adaptively adapt through the deformation of the elastic body 22, which is highly versatile and eliminates the cumbersome operation of readjusting and making special auxiliary tooling in traditional inspection methods, significantly shortening the inspection preparation time and improving the efficiency of batch inspection.

[0024] Preferably, the elastic body 22 is made of polyurethane or oil-resistant nitrile rubber, and the axis of the elastic body is aligned with the vertical direction of the positioning plate 10. An elastic bolt 23 is inserted into the elastic body for connecting and fixing the positioning plate 10 and the robotic arm execution end 30. The elastic bolt 23 passes through the connection hole of the robotic arm execution end 30, the elastic body 22 and the mounting base 21 in sequence, and is clearance-fitted with the mounting base 21 and the robotic arm connection hole to provide a certain angle of swing margin for the positioning plate 10, ensuring that the positioning column 11 can adaptively adjust its posture when the elastic body 22 deforms, thereby achieving a stable floating connection.

[0025] The elastic body 22 can also be a compression spring. One end of the compression spring is fixed to the rear end face of the mounting base 21 by welding or hex bolts, and the other end is fixed to the actuator end 30 of the robotic arm by a spring seat with a guide hole. The inner diameter of the guide hole of the spring seat is clearance-fitted with the outer diameter of the compression spring to limit the radial displacement of the compression spring. Preferably, the free length of the compression spring is set to 20-50mm, and the stiffness coefficient is selected to be 5-8N / mm. This ensures that the elastic body 22 can generate an elastic deformation of 5-10mm under the action of the robotic arm's traveling pressure (10-15N). This satisfies the angle self-adaptation requirement of the positioning post 11 against the inclined surface of the part to be tested, and also provides sufficient reset force to ensure that the positioning disk 10 quickly returns to its initial state after the test is completed.

[0026] Preferably, such as Figure 3 As shown, the positioning post 11 has an annular dust guide groove 12 at the front end of the contact head, which can guide the dust adhering during contact into the groove for discharge, preventing dust accumulation from affecting the positioning fit. When the contact head presses against the inclined surface of the part to be tested on the hub, the dust between the contact surfaces will be squeezed out at the moment of contact. Since the dust guide groove is a concave structure, this dust will be squeezed into the groove instead of accumulating between the contact head and the contact surface of the part to be tested, thus avoiding positioning deviation caused by the formation of tiny gaps by dust from the source, and further improving the adaptability to the testing environment and the positioning accuracy.

[0027] Preferably, the annular dust guide groove 12 has a depth of 0.5mm-1mm and a width of 0.8-1.5mm. The annular dust guide groove 12 is located 1-2mm away from the apex of the contact head of the positioning post 11, which does not affect the fitting accuracy of the four-point positioning and can cover the area where dust easily accumulates during contact. The cross-section of the annular dust guide groove 12 is generally V-shaped, and the included angle of the groove opening is preferably 45-60° to facilitate dust sliding and to facilitate processing and manufacturing.

[0028] Preferably, the front contact surface of the positioning post 11 is coated with a wear-resistant coating 13 to improve the wear resistance and hardness of the contact head. The wear-resistant coating 13 is preferably a titanium nitride coating with a thickness of 3-5 μm to avoid a decrease in positioning accuracy due to wear after long-term use and to extend the service life.

[0029] The above-disclosed embodiments are merely specific examples of this utility model, but this utility model is not limited thereto. For those skilled in the art, any modifications made without departing from the principle of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A floating mechanism for detecting wheel hub hardness, characterized in that: The device includes a positioning disk (10) for mounting a hardness tester (40). The front end of the positioning disk (10) is fixedly provided with a number of positioning columns (11) of equal height corresponding to the part of the wheel hub to be tested. The housing of the hardness tester (40) is fixedly connected to the positioning disk (10), and the probe of the hardness tester (40) extends vertically from the front end of the positioning disk (10). Its detection axis is coplanar and perpendicular to the apex of the positioning column (11). The positioning disk (10) is connected to the execution end (30) of the robotic arm through a floating component (20). The floating component (20) includes a mounting base (21) fixedly connected to the rear end of the positioning disk (10). The mounting base (21) is floatingly connected to the execution end (30) of the robotic arm through an elastic body (22).

2. The floating mechanism for wheel hub hardness detection according to claim 1, characterized in that: The elastic body (22) is made of elastic bar material, and the axis of the elastic bar material is consistent with the vertical direction of the positioning plate (10). An elastic bolt (23) is inserted inside the elastic bar material. The elastic bolt (23) passes through the connection hole of the robotic arm execution end (30), the elastic body (22) and the mounting base (21) in sequence. The elastic bolt (23) is clearance-fitted with the mounting base (21) and the connection hole of the robotic arm execution end (30).

3. The floating mechanism for wheel hub hardness detection according to claim 1, characterized in that: The elastic body (22) is a compression spring. One end of the compression spring is fixed to the rear end face of the mounting base (21), and the other end is fixed to the actuator end (30) of the robotic arm through a spring seat with a guide hole. The inner diameter of the guide hole of the spring seat is clearance-fitted with the outer diameter of the compression spring to limit the radial displacement of the compression spring.

4. The floating mechanism for wheel hub hardness detection according to claim 1, characterized in that: The positioning post (11) has an annular dust guide groove (12) at the front end of the contact head, which can guide the dust adhering during contact to the groove and discharge it, preventing dust accumulation from affecting the positioning fit.

5. The floating mechanism for wheel hub hardness detection according to claim 4, characterized in that: The annular dust guide groove (12) has a depth of 0.5mm-1 and a width of 0.8-1.5mm, and the annular dust guide groove (12) is located 1-2mm away from the top of the contact head of the positioning post (11).

6. The floating mechanism for wheel hub hardness detection according to claim 4, characterized in that: The cross-section of the annular dust guide groove (12) is V-shaped, and the groove opening angle is 45-60°.

7. The floating mechanism for wheel hub hardness detection according to claim 1, characterized in that: The front end contact surface of the positioning post (11) is coated with a wear-resistant coating (13).

Images