Positioning device for aluminum alloy compression performance test

Abstract

The utility model discloses a positioning device for an aluminum alloy compression performance test, belongs to the technical field of aluminum alloy performance tests, and solves the problem that the distance between an upper chuck and a lower chuck is difficult to accurately position when a sample is protected in the existing aluminum alloy compression test. A side hole is formed beside the center hole, a positioning column is vertically arranged in the center hole in a penetrating mode, a linear bearing is sleeved on the positioning column at the inserting position of the center hole, scales are arranged on the positioning column, a lead screw is vertically arranged in the side hole in a penetrating mode, a nut is sleeved on the lead screw, a spherical bearing is sleeved on the lead screw at the inserting position of the side hole, and the nut is in rigid connection with the bottom of the positioning column. The positioning column ascends and descends through the lead screw principle, and the device is simple in structure, low in cost, convenient to operate, obvious in effect and high in practicability.

Description

Technical Field

[0001] This utility model belongs to the field of aluminum alloy performance testing technology, specifically relating to a positioning device for aluminum alloy compression performance testing. Background Technology

[0002] Aluminum alloys, with their advantages of low density, high strength, good machinability, and strong corrosion resistance, are widely used in aerospace, automotive manufacturing, mechanical engineering, and many other fields. In practical applications, aluminum alloy components often bear various complex loads, among which compressive loads are one of the most common forms of stress. Accurately understanding the compressive properties of aluminum alloys is crucial for ensuring the safety and reliability of components under actual working conditions and for optimizing component design.

[0003] In aluminum alloy compression performance testing, to further improve the accuracy and repeatability of the compression test, a sample protection operation is generally performed before the formal compression. During the sample protection operation, a fixed height is set (not too high), so that when the clamps on the compression equipment descend to this fixed height at a certain speed and force, they just press down on the sample. This completes the sample protection operation, and then the formal compression test is conducted. To ensure that the clamps on the compression equipment press down on the sample exactly when they descend to the fixed height, the distance between the upper clamp and the top of the sample must be the same fixed height before the upper clamp descends.

[0004] Currently, during testing, production units typically maintain a sample protection operating height of 2mm. During operation, they lower the upper clamp while visually estimating the distance between the upper and lower clamps using a ruler, ensuring the distance is the sample height plus 2mm. However, visually estimating with a ruler near the clamps is inaccurate, inconvenient, and prone to significant errors, leading to repeated testing. Therefore, there is an urgent need to develop a positioning device suitable for aluminum alloy compression performance testing. This device should achieve high-precision positioning, possess good versatility, and be easy and efficient to operate, effectively improving the accuracy and efficiency of aluminum alloy compression performance testing. Utility Model Content

[0005] The purpose of this invention is to provide a positioning device for aluminum alloy compression performance testing, which can accurately position the upper and lower clamps and is adaptable to changes and adjustments in distance. It is efficient and easy to operate, thus solving the problem of accurate positioning of the upper and lower clamps during sample protection operations in current aluminum alloy compression tests.

[0006] The technical solution of this utility model is: a positioning device for aluminum alloy compression performance testing, including a base shell, a central hole at the center of the base shell, a side hole next to the central hole, a positioning post vertically penetrating through the central hole, a linear bearing sleeved at the insertion point of the positioning post in the central hole, a scale on the positioning post, a lead screw vertically penetrating through the side hole, a nut sleeved on the lead screw, a spherical bearing sleeved at the insertion point of the lead screw in the side hole, and the nut rigidly connected to the bottom of the positioning post.

[0007] As a further improvement of this utility model, a lead screw support seat is provided at the bottom of the lead screw, and the lead screw support seat is located on the upper bottom surface inside the base shell.

[0008] As a further improvement of this utility model, a handwheel is provided at the top of the lead screw.

[0009] The beneficial effects of this invention are as follows: This device rotates a lead screw, which drives the nut upwards. The positioning pin moves upwards with the nut, and the height is determined by the scale on the positioning pin to meet the specified requirements. The device is placed on the lower clamp of the testing machine, and a very small force and slow speed are applied to it. The testing machine data is observed. When the machine shows that the device is under slight force, it indicates that the upper clamp has pressed onto the device, and the descent of the upper clamp is stopped. The lead screw is rotated in the opposite direction, and the nut drives the positioning pin downwards. The device is then removed, and the distance between the upper and lower clamps is the set fixed value, ready for subsequent tests.

[0010] This device uses a lead screw and nut principle to raise and lower the positioning column. It has a simple structure, low cost, and graduations on the positioning column for easy and accurate height adjustment. Once the height is properly adjusted, the nut will not rotate when the lead screw is stationary, thus self-locking the positioning column without the need for an additional locking mechanism. During use, the upper clamp lightly presses against the positioning column to determine the distance between the upper and lower clamps. After positioning, the positioning column is lowered using the lead screw, allowing for quick and easy removal of the device. This device is simple in design, easy to operate, effective, and highly practical. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] In the diagram: 1-positioning pin; 2-center hole; 3-handwheel; 4-side hole; 5-spherical bearing; 6-linear bearing; 7-lead screw; 8-scale; 9-nut; 10-base shell; 11-lead screw support. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1As shown, a positioning device for testing the compression performance of aluminum alloy includes a base shell 10. A central hole 2 is provided at the center of the base shell 10, and a side hole 4 is provided beside the central hole 2. A positioning post 1 is vertically inserted through the central hole 2. A linear bearing 6 is fitted onto the positioning post 1 at the insertion point of the central hole 2. The positioning post 1 is provided with a scale 8. A lead screw 7 is vertically inserted through the side hole 4. A nut 9 is fitted onto the lead screw 7. A spherical bearing 5 is fitted onto the lead screw 7 at the insertion point of the side hole 4. The nut 9 is rigidly connected to the bottom of the positioning post 1.

[0015] The lead screw 7 has a lead screw support seat 11 at its bottom, which is located on the upper bottom surface inside the base housing 10. The lead screw 7 has a handwheel 3 at its top.

[0016] Example 1

[0017] The device in this embodiment achieves lifting and lowering through a lead screw 7-nut 9 transmission system. The lead screw 7-nut 9 transmission system consists of a lead screw 7, which is supported at one end in a spherical bearing 5 and at the other end in a lead screw support seat 11, and is vertically installed inside the base housing 10 through a side hole 4; a positioning column 1, which is vertically installed inside the base housing 10 through a central hole 2 opened at the center of the base housing 10 and passing through a linear bearing 6; and a nut 9 that can slide threadedly on the lead screw 7.

[0018] The base shell 10 is a cylindrical structure with a closed bottom. The upper edge of the linear bearing 6 is flush with the upper edge of the center hole 2, which facilitates the guidance and sliding of the positioning post 1. The positioning post 1 is a solid cylinder made of hard material. The scale 8 set on the positioning post 1 progresses from the top to the bottom. The top scale value is set as the height value of the base shell 10 for easy reading. The upper edge of the spherical bearing 5 is flush with the upper edge of the side hole 4. The handwheel 3 can be used to drive the lead screw 7 to rotate and support the lead screw 7. When the handwheel 3 is turned, the lead screw 7 rotates, driving the nut 9 to move upward. The lead screw support seat 11 is used to support the lead screw 7.

[0019] The commonly used compression test specimens in the industry have a diameter of 13.0 mm and a length of 38 ± 1 mm. The testing machine is usually set to protect the specimen by 2 mm. This requires ensuring that when the specimen is placed vertically on the lower clamp, the top of the specimen is 2 mm away from the upper clamp.

[0020] When using this device for positioning, first measure the actual length of the test, for example, 39mm, then add 2mm, so the overall height of the device needs to be set to 41mm. The overall height of the base shell 10 is 30mm, and the scale line at the top of the positioning post 1 starts from 30mm. Rotating the handwheel 3 drives the lead screw 7 to rotate, and the lead screw 7 drives the nut 9 to move upward. The positioning post 1 moves upward with the nut 9. When the scale 8 on the positioning post 1 exposed on the base shell 10 shows 41mm, it means that the overall height of the device has reached 41mm.

[0021] Place the device on the lower clamp of the testing machine, set a force of 5N, and press the upper clamp against the device at a speed of 0.2mm / min. Observe the testing machine data. When the display shows that the device is under slight force, it means that the upper clamp has pressed onto the device. Stop the descent of the upper clamp. Rotate handwheel 3 in the opposite direction to lower the positioning column 1 and remove the device. The distance between the upper and lower clamps is 41mm. Place the sample, with the top of the sample 2m away from the upper clamp. Subsequent tests can then be carried out.

Claims

1. A positioning device for aluminum alloy compression property testing, characterized by: The base includes a base shell (10), a central hole (2) is provided at the center of the base shell (10), a side hole (4) is provided next to the central hole (2), a positioning post (1) is vertically inserted through the central hole (2), a linear bearing (6) is fitted at the insertion point of the positioning post (1) in the central hole (2), a scale (8) is provided on the positioning post (1), a lead screw (7) is vertically inserted through the side hole (4), a nut (9) is fitted on the lead screw (7), a spherical bearing (5) is fitted at the insertion point of the lead screw (7) in the side hole (4), and the nut (9) is rigidly connected to the bottom of the positioning post (1).

2. A positioning device for aluminum alloy compression property testing according to claim 1, characterized in that: The bottom of the lead screw (7) is provided with a lead screw support seat (11), which is located on the upper bottom surface inside the base shell (10).

3. A positioning device for use in aluminium alloy compression testing according to claim 1 or 2, characterised in that: The lead screw (7) is equipped with a handwheel (3) at its top.

Images