Auxiliary device for detecting mechanical property of metal and plastic sheet welding joint
The auxiliary device for metal-plastic welded joints uses a tensile fixture with an auxiliary clamp and stud system to ensure accurate mechanical property testing by minimizing clamping torque and maintaining consistent sheet positioning, thus reducing costs and errors.
Patent Information
- Application Number
- CN202420565123.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-22
AI Technical Summary
Existing methods for testing the mechanical properties of welded joints between metal and plastic sheets are costly and prone to errors due to torque-induced deformation and low bonding strength, making accurate measurement difficult.
An auxiliary device comprising a tensile fixture with an auxiliary clamp and stud system is used to fix metal and plastic sheets, ensuring they are on the same vertical plane, with a small hole in the metal sheet for the stud to minimize clamping torque and maintain consistent positioning.
The device reduces experimental errors and costs by allowing accurate mechanical property testing of metal-plastic welded joints, addressing torque-induced deformation and low bonding strength issues.
Smart Images
Figure CN222280307U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of metal-plastic welding and relates to a mechanical property detection auxiliary device, in particular to a mechanical property detection auxiliary device for a metal and plastic sheet welding joint. Background Art
[0002] With the implementation of low-cost and weight-reduction concepts in global industrial production, plastic-metal connection parts are increasingly replacing traditional metal parts. Compared with riveting and gluing, welding heats the contact surface of the parts to melt the plastic, and finally cools and solidifies it to form a good joint with the metal. It has the advantages of high strength, no pollution, good sealing, etc., and has excellent industrial properties.
[0003] Heat input during welding can cause micro-deformation of the specimen, and deformation of thin plate welding specimens is more visible. Large-scale stretching machines will cause torque between thin sheets when clamping thin sheets, further causing direct fracture or cracking of the joints, directly affecting the mechanical properties of thin sheet specimens. In the prior art, film stretching equipment is mature and diverse, but there are few methods for testing the mechanical properties of welded joints of metal and plastic sheets. Utility Model Content
[0004] The utility model aims to provide an auxiliary device for detecting the mechanical properties of metal and plastic sheet welded joints, so as to solve the problem of high manpower and material costs of purchasing an additional stretching machine for detecting the mechanical properties of metal and plastic sheet welded joints in the prior art.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions
[0006] An auxiliary device for detecting mechanical properties of a metal and plastic sheet welding joint comprises: a tensile fixture of a universal testing machine, an auxiliary fixture, a metal sheet and a plastic sheet; wherein:
[0007] The tensile fixture of the universal testing machine includes an upper tensile fixture and a lower tensile fixture, and the upper tensile fixture is clamped and fixed to the head of the auxiliary fixture;
[0008] The auxiliary clamp is a U-shaped structure with an opening facing downward, on which a stud is provided, which can be fixed to two opposite surfaces of the auxiliary clamp by nuts, and the stud is parallel to the ground;
[0009] The metal sheet and the plastic sheet are placed vertically, and a small round hole is provided at the tail of the metal sheet, through which the stud passes to be fixed on the auxiliary clamp, and the stud is fixed by the nut;
[0010] The plastic sheet is fixed on the lower tensile fixture of the tensile fixture of the universal testing machine.
[0011] Preferably, the small circular hole is located in the center of the metal sheet.
[0012] Preferably, the auxiliary fixture is located in the center of the tensile fixture of the universal testing machine and is perpendicular to the ground to reduce experimental errors.
[0013] Preferably, the metal sheet and the plastic sheet pass through the stud and are entirely on the same vertical plane.
[0014] Preferably, the metal sheets satisfy the requirement that the positions of the small circular holes of different metal sheets remain consistent under the same detection conditions.
[0015] A method for detecting mechanical properties of a metal and plastic sheet welded joint comprises the following steps:
[0016] Step 1: Use the tensile fixture of the universal testing machine to clamp the head of the auxiliary fixture;
[0017] Step 2: Pass the stud through the small circular hole on the metal side of the welding specimen (the small circular hole is completed before welding);
[0018] Step 3: Tighten the nut to the appropriate position to ensure that the stud is fixed;
[0019] Step 4: Adjust the position of the welding sample and clamp the plastic sheet with the tensile fixture of the universal testing machine;
[0020] Step 5. Adjust the position of the tensile fixture of the universal testing machine so that the threads on the stud do not touch the small circular hole on the metal side of the welding specimen;
[0021] Step 6: Start the mechanical properties test of the metal and plastic sheet welding joint according to the standard.
[0022] Compared with the prior art, the utility model has the following beneficial effects:
[0023] 1. The utility model aims at testing the mechanical properties of welded joints of metal sheets and plastic sheets. An auxiliary fixture is added to the original tensile wedge fixture to realize the tensile test of the mechanical properties of the sheet, which greatly saves costs.
[0024] 2. The utility model punches a hole in the middle of the tail of the metal sheet and passes a stud through it, and adopts an auxiliary fixture with a through hole to cooperate with the existing tensile test fixture. On the one hand, it solves the problem that the torque generated by clamping affects the mechanical properties of the thin sheet sample. On the other hand, it solves the problem that the low bonding strength of the plastic and metal welded joint is easy to fail in the sample clamping stage of the tensile shear test process, making it difficult to accurately obtain the mechanical properties of the metal-plastic welded joint.
[0025] 3. The utility model has a simple structure, is easy to process, is easy to replace, has a scientific and reasonable design, is simple and portable, and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic structural diagram of the auxiliary device for detecting the mechanical properties of the welded joint of metal and plastic sheets in the embodiment in the working state;
[0027] Figure 2 It is a front view of the auxiliary clamp in the embodiment;
[0028] Figure 3 It is a left view of the auxiliary clamp in the embodiment;
[0029] Figure 4 A top view of the auxiliary clamp in the embodiment;
[0030] The reference numerals are as follows: 1 tensile fixture of universal testing machine; 2 auxiliary fixture; 3 stud; 4 nut; 5 metal sheet; 6 plastic sheet. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0032] like Figures 1 to 4 As shown, an auxiliary device for detecting the mechanical properties of a welded joint of a metal and a plastic sheet is exemplarily described, comprising a tensile fixture 1 of a universal testing machine, an auxiliary fixture 2, a metal sheet 5 and a plastic sheet 6; wherein the tensile fixture 1 of the universal testing machine comprises an upper tensile fixture and a lower tensile fixture, and the upper tensile fixture is clamped and fixed to the head of the auxiliary fixture; the auxiliary fixture 2 is a U-shaped structure with an opening downward, on which a stud 3 is provided, which can be fixed to two opposite surfaces of the auxiliary fixture 2 by a nut 4, and the stud is parallel to the ground; the metal sheet and the plastic sheet are placed vertically, and a small circular hole is provided at the tail of the metal sheet, which is fixed to the auxiliary fixture through the stud, and the stud is fixed by a nut; the plastic sheet is fixed to the lower tensile fixture.
[0033] In some embodiments, the small circular hole is located in the center of the metal sheet.
[0034] In some embodiments, the auxiliary fixture is located in the center of the tensile fixture of the universal testing machine and is perpendicular to the ground to reduce experimental errors.
[0035] In some embodiments, the metal sheet and the plastic sheet pass through the stud and are entirely on the same vertical plane.
[0036] In some embodiments, the positions of the small circular holes of different metal sheets are kept consistent when the metal sheets meet the same detection conditions.
[0037] A method for detecting mechanical properties of a metal and plastic sheet welded joint comprises the following steps:
[0038] Step 1: Use the tensile fixture of the universal testing machine to clamp the head of the auxiliary fixture;
[0039] Step 2: Pass the stud through the small circular hole on the metal side of the welding specimen (the small circular hole is completed before welding);
[0040] Step 3: Tighten the nut to the appropriate position to ensure that the stud is fixed;
[0041] Step 4: Adjust the position of the welding sample and clamp the plastic sheet with the tensile fixture of the universal testing machine;
[0042] Step 5. Adjust the position of the tensile fixture of the universal testing machine so that the threads on the stud do not touch the small circular hole on the metal side of the welding specimen;
[0043] Step 6: Start the mechanical properties test of the metal and plastic sheet welding joint according to the standard.
[0044] In summary, the utility model aims at the mechanical property test of the welded joint of metal sheet and plastic sheet, and adds an auxiliary fixture on the basis of the original tensile wedge fixture, so as to realize the tensile test of the mechanical property of the sheet, which greatly saves the cost. By drilling a hole in the middle of the tail of the metal sheet and passing the stud, the auxiliary fixture with a through hole is used in conjunction with the existing tensile test fixture to solve the problem that the torque generated by clamping affects the mechanical property results of the sheet sample on the one hand, and solves the problem that the low bonding strength of the plastic and metal welded joint is easy to fail in the sample clamping stage of the tensile shear test process, and it is difficult to accurately obtain the mechanical properties of the metal-plastic welded joint. The structural design is scientific and reasonable, simple and portable, and easy to promote and apply.
[0045] The above is a preferred embodiment of the utility model, but the utility model should not be limited to the content disclosed in the embodiment. Therefore, any equivalent or modification completed without departing from the spirit disclosed in the utility model shall fall within the scope of protection of the utility model.
Claims
1. An auxiliary device for detecting mechanical properties of metal and plastic sheet welding joints, characterized in that: It includes a universal testing machine tensile fixture, an auxiliary fixture, a metal sheet and a plastic sheet; among which: The tensile fixture of the universal testing machine includes an upper tensile fixture and a lower tensile fixture, and the upper tensile fixture is clamped and fixed to the head of the auxiliary fixture; The auxiliary clamp is a U-shaped structure with an opening facing downward, on which a stud is provided, which can be fixed to two opposite surfaces of the auxiliary clamp by nuts, and the stud is parallel to the ground; The metal sheet and the plastic sheet are placed vertically, and a small round hole is provided at the tail of the metal sheet, through which the stud passes to be fixed on the auxiliary fixture; The plastic sheet is fixed on the lower tensile fixture of the tensile fixture of the universal testing machine.
2. The auxiliary device for detecting mechanical properties of metal and plastic sheet welding joints according to claim 1 is characterized in that: The small circular hole is located in the center of the metal sheet.
3. The auxiliary device for detecting mechanical properties of metal and plastic sheet welding joints according to claim 1 is characterized in that: The auxiliary fixture is located in the center of the tensile fixture of the universal testing machine and is perpendicular to the ground.
4. The auxiliary device for detecting mechanical properties of metal and plastic sheet welding joints according to claim 1 is characterized in that: The metal sheet and the plastic sheet pass through the stud and are entirely on the same vertical plane.
5. The auxiliary device for detecting mechanical properties of metal and plastic sheet welding joints according to claim 1 is characterized in that: The metal sheets satisfy the requirement that the positions of the small circular holes of different metal sheets remain consistent under the same detection conditions.