Screw-fixed vacuum brazing test bar fixture

Abstract

This utility model discloses a screw-fixed vacuum brazing test bar fixture, belonging to the field of vacuum brazing technology. The fixture includes a tank base, a ladder, and a clamping hole; wherein: the tank base is a rectangular tank structure made of high-temperature alloy, used to support the overall structure of the fixture; the ladder has a circular hole at each of the four inner corners along the height direction, forming an inner ladder between adjacent circular holes; the clamping hole has an internal thread on the side of the tank base in the width direction for clamping the test bar. This fixture, made of high-temperature alloy, achieves precise positioning and stable clamping of the test bar in high-temperature, high-vacuum environments through a screw-fixing structure, effectively solving the problem of welding quality fluctuations caused by thermal deformation and insecure fixing in traditional fixtures during vacuum brazing. It is suitable for precision welding experiments and mass production, ensuring the positional accuracy of the test bar and the quality of the weld joint during brazing.

Description

Technical Field

[0001] This utility model relates to the field of vacuum brazing technology, specifically to a screw-fixed vacuum brazing test bar fixture, which is suitable for high temperature (600-1200℃) and high vacuum (10 -3 -10 -5 Precision welding experiments and mass production of test bars under Pa) environment. Background Technology

[0002] To test the mechanical properties of vacuum brazed butt joints with different base materials and brazing filler metals, including room temperature tensile, high temperature tensile, and high temperature creep rupture, it is necessary to first vacuum braze the butt joint structure into test bars, and then machine the test bars into standard specimens for mechanical property testing. As standard samples for testing the performance of metallic materials, the quality of the vacuum brazing of the test bars directly affects the accuracy of the test results. Considering the characteristics of vacuum brazing technology, the welding of test bars requires particular attention to welding precision, joint strength, and process stability.

[0003] During the brazing of test bars, the brazing fixture fixes the brazing components and filler metal together, creating an appropriate gap at the connection point. After the filler metal melts, it is capillarily adsorbed within the gap to form the brazed seam. The fixture maintains the relative position of the components throughout the brazing process, ensuring dimensional tolerances. The brazing fixture for test bars is crucial for ensuring welding quality and improving production efficiency. Its core functions are to fix the test bar to be welded, control the welding gap, and prevent welding deformation.

[0004] However, traditional positioning fixtures have revealed some problems in practical applications, mainly as follows:

[0005] 1. Inaccurate positioning: Traditional positioning fixtures may not provide sufficient accuracy to ensure the correct position of the test bar during the welding process. This may result in the welded test bar not meeting the required specifications.

[0006] 2. The tooling is difficult to maintain its shape and strength under high temperature conditions, which affects the consistency and reliability of the welding process; or the tooling design cannot effectively disperse the stress generated during the welding process, resulting in local overheating, which affects the uniform heating of the welding area.

[0007] 3. Poor clamping reliability of the tooling for the test bar affected welding accuracy and product quality.

[0008] To address the aforementioned issues, it is necessary to develop new tooling designs aimed at achieving high-precision positioning and improving welding quality during the brazing process of test bars, thereby meeting the needs of laboratory testing and industrial production. Utility Model Content

[0009] The purpose of this utility model is to provide a screw-fixed vacuum brazing test bar fixture. This fixture achieves precise positioning and stable clamping of the test bar in high temperature and high vacuum environments through a screw fastening structure, effectively solving the problem of welding quality fluctuation caused by thermal deformation and insecure fixing in traditional fixtures during vacuum brazing.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] A screw-fixed vacuum brazing test bar fixture includes a tank base, a ladder, and clamping holes; wherein:

[0012] The base of the groove is a rectangular groove structure made of high-temperature alloy, used to support the overall structure of the tooling;

[0013] Step platform: A circular hole is opened at each of the four inner corners of the base of the trough along the height direction, and a step platform is formed between two adjacent circular holes.

[0014] Clamping hole: A clamping hole with internal threads is provided on the side of the base of the tank in the width direction for clamping the test bar.

[0015] Furthermore, the tooling is also equipped with two vent holes, which are located on one side of the base of the tank along its length, for the release of gas during brazing.

[0016] Furthermore, the depth of the groove base is 10-30mm, and the material is Inconel 718 high-temperature alloy.

[0017] Furthermore, the diameter of the circular holes at the four corners of the groove base is 0.5-3mm.

[0018] Furthermore, the surface roughness Ra of the ladder is ≤3.2μm, and the ladder is used to support and position the bottom of the test bar.

[0019] Furthermore, a high-temperature alloy screw is provided in the clamping hole, and the test bar placed in the tank base is clamped by tightening the high-temperature alloy screw.

[0020] Furthermore, the high-temperature alloy screw is made of GH4169 alloy or an equivalent material, with an oxidation resistance index ≤0.8mg / cm² at 1000℃. 2 .

[0021] Furthermore, this tooling is compatible with The depth of the test rod in the tank base is 0.8-1.5 times the diameter of the test rod, the length of the tank base in the tank is greater than the length of the test rod, and the width of the tank base in the tank is greater than the diameter of the test rod.

[0022] The advantages and beneficial effects of this utility model are as follows:

[0023] 1. The integrated tank design eliminates the cumulative errors of traditional multi-component assembly, reducing axial positioning and radial alignment errors of the test bar. The design of the ventilation holes allows for the rapid removal of residual welding gases from the test bar, reducing brazing porosity and significantly improving the consistency of the welded joints.

[0024] 2. In this utility model tooling, the base of the groove is made of high-temperature alloy Inconel 718 groove, and the screws in the clamping holes are made of GH4169 material. Under high temperature conditions, the overall deformation is reduced and the loss of screw preload is reduced.

[0025] 3. In the tooling of this utility model, a stepped platform is formed between the two circular holes in the tank. During brazing, excess brazing material flows along the stepped platform to the circular holes on both sides, avoiding the increased labor and equipment costs caused by the accumulation of brazing material at the end of the test bar, which requires mechanical grinding, laser cleaning or chemical soaking to remove it.

[0026] 4. In this utility model tooling, the simplified structure without clamping blocks can be directly adapted by screw installation and adjustment. The test bar can be used without changing tooling, which shortens the changeover time of traditional tooling and improves equipment utilization.

[0027] 5. This utility model tooling can ensure the stability of parts during the brazing process, avoid quality problems, reduced process efficiency and inaccurate positioning caused by movement, significantly improve the quality and stability of brazing, and effectively reduce the scrap rate. Attached Figure Description

[0028] Figure 1 This is a front view of the test bar tooling of this utility model.

[0029] Figure 2 This is a top view of the test bar tooling of this utility model.

[0030] Figure 3 This is a side view of the test bar tooling of this utility model.

[0031] Figure 4 This is a structural diagram of the test bar tooling of this utility model.

[0032] Figure 5 This is a schematic diagram of the test bar tooling used in this utility model.

[0033] In the diagram: 1-vent hole; 2-ladder platform; 3-circular hole; 4-clamping hole; 5-test bar; 6-high temperature alloy screw. Detailed Implementation

[0034] The present invention will be described in detail below with reference to the accompanying drawings.

[0035] This utility model provides a screw-fixed vacuum brazing test bar fixture, such as... Figure 1-4As shown. The test bar fixture includes a groove base, a ladder 2 and a clamping hole 4; the groove base is a rectangular groove structure, formed by CNC milling, preferably made of Inconel 718 high-temperature alloy, and the depth of the groove base is 10-30mm.

[0036] At each of the four inner corners of the base of the groove, a circular hole 3 with a diameter of 0.5-3mm is opened along the depth direction. A stepped platform 2 is formed between two adjacent circular holes. The surface roughness Ra of the stepped platform is ≤3.2μm. The stepped platform is used to support and position the bottom of the test bar. At the same time, when excess brazing filler metal flows down, it can flow into the circular holes on both sides of the stepped platform, thus avoiding the accumulation of brazing filler metal at the end of the test bar.

[0037] A clamping hole 4 is formed on one side of the tank base along its width direction. The clamping hole has internal threads, and a high-temperature alloy screw 6 is installed in the clamping hole 4. By tightening the high-temperature alloy screw 6, the test bar 5 placed in the tank base is clamped, ensuring that the test bar is longitudinally fixed. The high-temperature alloy screw is preferably made of GH4169 alloy, which has an oxidation resistance index of ≤0.8mg / cm at 1000℃. 2 .

[0038] Furthermore, the tooling is also equipped with two vent holes 1, which are opened on one side of the tank base along its length, for venting residual gas from the test bar during brazing.

[0039] This utility model tooling adapter Test rod.

[0040] Example 1:

[0041] The screw-fixed vacuum brazing test bar fixture structure in this embodiment is as follows:

[0042] The base of the tank is integrally machined from Inconel 718 high-temperature alloy (without columns). It is a rectangular tank structure with a depth of 12.5 mm, a length of 69 mm, and a wall thickness of 5 mm. There are 1.25 mm diameter circular holes at the four corners of the tank, and a stepped platform is formed between two adjacent circular holes. The surface roughness of the stepped platform Ra≤3.2 μm.

[0043] Two ventilation holes are opened on one side of the tank base along the length direction, and an M3 screw hole is opened on one side of the tank base along the width direction. An M3 high-temperature alloy screw (GH4169 material) is screwed into the M3 screw hole, and a clamping force of 5-20N is applied by rotating the screw to achieve axial fixation of the test bar.

[0044] The usage process of the test bar fixture in this embodiment is as follows:

[0045] The tooling is placed with the clamping holes facing upwards.

[0046] Pick The test bar is placed on the ladder platform inside the groove. The ladder platform is used to achieve axial positioning and control the side of the test bar to prevent it from contacting the inside of the groove base. This allows the gas to be automatically discharged through the vent hole 1 during welding, ensuring a good fit and preventing the welding filler metal from flowing to the bottom of the test bar and accumulating (the filler metal flows into the circular holes on both sides of the ladder platform).

[0047] Use a torque wrench (set to 10 N·m) to rotate the high-temperature alloy screw 4 on the top of the fixture, so that the end of the screw makes point contact with the upper surface of the test bar and clamps it, thus constraining the radial displacement of the test bar.

[0048] The vacuum furnace is evacuated to the required vacuum level, and the temperature is increased and maintained according to the process settings. Vent hole 1 is used to continuously exhaust air to avoid porosity defects at the weld joint of the test bar. After cooling, the top screw of the tooling is rotated in the opposite direction to remove the test bar.

[0049] This utility model includes, but is not limited to, the above embodiments. Any equivalent substitutions or partial improvements made under the overall innovative concept of this utility model shall be considered within the protection scope of this utility model.

Claims

1. A screw-fixed vacuum brazing test bar fixture, characterized in that: The fixture includes a tank base, a ladder, and clamping holes; wherein: The base of the groove is a rectangular groove structure made of high-temperature alloy, used to support the overall structure of the tooling; Step platform: A circular hole is opened at each of the four inner corners of the base of the trough along the height direction, and a step platform is formed between two adjacent circular holes. Clamping hole: A clamping hole with internal threads is provided on the side of the base of the tank in the width direction for clamping the test bar.

2. The screw-fixed vacuum brazing test bar fixture according to claim 1, characterized in that: The fixture is also equipped with two vents, which are located on one side of the base of the tank along its length, for the release of gas during brazing.

3. The screw-fixed vacuum brazing test bar fixture according to claim 1, characterized in that: The depth of the base of the groove is 10-30mm, and the material is Inconel 718 high-temperature alloy.

4. The screw-fixed vacuum brazing test bar fixture according to claim 1, characterized in that: The diameter of the circular holes at the four corners of the base of the groove is 0.5-3mm.

5. The screw-fixed vacuum brazing test bar fixture according to claim 1, characterized in that: The surface roughness Ra of the ladder is ≤3.2μm, and the ladder is used to support and position the bottom of the test bar.

6. The screw-fixed vacuum brazing test bar fixture according to claim 1, characterized in that: A high-temperature alloy screw is installed in the clamping hole. By tightening the high-temperature alloy screw, the test bar placed in the tank base is clamped.

7. The screw-fixed vacuum brazing test bar fixture according to claim 6, characterized in that: The high-temperature alloy screw is made of GH4169 alloy, with an oxidation resistance index ≤0.8mg / cm³ at 1000℃. 2 .

8. The screw-fixed vacuum brazing test bar fixture according to claim 6, characterized in that: This fixture is compatible with φ5-φ17.5mm test bars. The depth of the groove base is 0.8-1.5 times the diameter of the test bar, and the length of the groove base is greater than the length of the test bar.

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