A bolt Rockwell hardness test fixture

Abstract

The present invention proposes a bolt Rockwell hardness test fixture, comprising a locking mechanism, a limiting mechanism, a base and a screw. The limiting mechanism is used to place the bolt to be tested; the locking mechanism is used to fix the limiting mechanism on the base; the base is used to place the entire fixture on the hardness tester screw, and ensure that the center line of the device coincides with the center line of the hardness tester; the screw is buckled on the base, and is used to tighten the entire fixture on the hardness tester screw through threads. When the fixture is used for hardness testing, the detection surface of the bolt head is perpendicular to the hardness tester pressure head, which can ensure that the bolt placement method complies with national standards. The device is easy and reliable to use, has a simple and compact structure, and can improve the detection quality and detection efficiency of smaller-sized bolts.

Description

Technical Field

[0001] The invention belongs to the technical field of testing and detecting fasteners, and in particular relates to a bolt Rockwell hardness test fixing device. Background Art

[0002] The bolt hardness test method is clearly defined in accordance with GB / T3098.1-2010 "Fastener Mechanical Properties Bolts, Screws and Studs" and GB / T3098.2-2012 "Fastener Mechanical Properties Nut Coarse Thread". The test part is the bolt head. During the test, the sample will tilt, resulting in inaccurate test results. Especially when the bolt specifications are small, the test results have large deviations, and the test needs to be repeated several times to ensure the accuracy of the test results. In addition, during the test, the inclination of the bolt makes the hardness tester pressure head easy to be damaged due to the force, causing certain economic losses. In order to improve the quality of testing and reduce losses, it is necessary to design a fixture that is convenient for testing the Rockwell hardness of smaller bolts. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The invention provides a bolt Rockwell hardness test fixture to solve the technical problem of uneven placement and tilt of bolts when performing Rockwell hardness testing on bolts with smaller specifications.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention proposes a bolt Rockwell hardness test fixture, which includes a locking mechanism, a limiting mechanism, a base and a screw; wherein the limiting mechanism is used to place the bolt to be tested; the locking mechanism is used to fix the limiting mechanism on the base; the base is used to place the entire fixture on the hardness tester screw and ensure that the center line of the device coincides with the center line of the hardness tester; the screw is buckled on the base and is used to tighten the entire fixture on the hardness tester screw through threads.

[0007] Furthermore, the locking mechanism includes a handle and a screw, and the handle and the screw are fixed together; the screw can be screwed into the screw hole of the base under the drive of the handle, and the middle position of the clamped part of the hexagonal clamp of the limiting mechanism is supported, thereby fastening the limiting mechanism in the slot of the base to ensure that the limiting mechanism does not shake.

[0008] Furthermore, the limiting mechanism includes a bolt, a limiting plate and a hexagonal clamp; wherein, the upper part of the hexagonal clamp is provided with a hexagonal inner hole with the same size as the head of the bolt to be measured, and the lower part of the hexagonal clamp has a clamped part that cooperates with the slot of the base; the limiting plate is fixed to one side of the hexagonal clamp by a bolt.

[0009] Furthermore, a slot matching with the clamped portion of the limiting mechanism is provided above the base, a hardness tester lead screw is inserted below the base, and a screw hole is processed at the middle position of the side of the slot.

[0010] Furthermore, the lead screw is a cylindrical structure with a through hole at the top. The lead screw cooperates with the hardness tester lead screw. After the hardness tester lead screw is inserted into the base, the lead screw is inserted into the base so that the upper end of the base passes through the through hole at the top of the lead screw. The lead screw is tightened on the hardness tester lead screw through the internal thread, thereby fixing the entire fixing device on the hardness tester lead screw.

[0011] (III) Beneficial effects

[0012] The present invention proposes a bolt Rockwell hardness test fixture, comprising a locking mechanism, a limiting mechanism, a base and a screw. The limiting mechanism is used to place the bolt to be tested; the locking mechanism is used to fix the limiting mechanism on the base; the base is used to place the entire fixture on the hardness tester screw, and ensure that the center line of the device coincides with the center line of the hardness tester; the screw is buckled on the base, and is used to tighten the entire fixture on the hardness tester screw through threads. When the fixture is used for hardness testing, the detection surface of the bolt head is perpendicular to the hardness tester pressure head, which can ensure that the bolt placement method complies with national standards. The device is easy and reliable to use, has a simple and compact structure, and can improve the detection quality and detection efficiency of smaller-sized bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the bolt Rockwell hardness test fixture of this embodiment;

[0014] Figure 2 This is a schematic diagram of the disassembly of the bolt Rockwell hardness test fixture of this embodiment;

[0015] Figure 3 Schematic diagram of the limit mechanism structure in this embodiment;

[0016] Figure 4 Schematic diagram of the base and lead screw structure in this embodiment. DETAILED DESCRIPTION

[0017] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0018] This embodiment provides a bolt Rockwell hardness test fixture, the structure of which is as follows: Figure 1As shown, it includes a locking mechanism 1, a limiting mechanism 2, a base 3 and a screw 4. Among them, the limiting mechanism 2 is used to place the bolt to be tested; the locking mechanism 1 is used to fix the limiting mechanism 2 on the base 3; the base 3 is used to place the entire fixture on the hardness tester screw and ensure that the center line of the device coincides with the center line of the hardness tester; the screw 4 is buckled on the base 3 and is used to tighten the entire fixture on the hardness tester screw through threads.

[0019] like Figures 2 to 4 As shown, the locking mechanism includes a handle 1-1 and a screw 1-2, and the handle 1-1 is fixed together with the screw 1-2. The limiting mechanism 2 includes a bolt 2-1, a limiting plate 2-2 and a hexagonal clamp 2-3. The upper part of the hexagonal clamp 2-3 is provided with a hexagonal inner hole of the same size as the head of the bolt to be tested, and the lower part of the hexagonal clamp 2-3 has a clamped portion that cooperates with the slot of the base 3. The limiting plate 2-2 is fixed to one side of the hexagonal clamp 2-3 by two bolts 2-1. When testing, the head of the bolt to be tested is placed into the hexagonal inner hole from the other side of the hexagonal clamp 2-3 and is limited by the limiting plate 2-2. A slot that cooperates with the clamped portion of the limiting mechanism 2 is provided above the base 3, and the bottom of the base 3 is used to insert the hardness tester lead screw, and a screw hole 3-1 is processed in the middle position of the side of the slot. The screw 1-2 can be screwed into the screw hole 3-1 of the base 3 driven by the handle 1-1, and the middle position of the clamped part of the hexagonal clamp 2-3 is supported, so that the limit mechanism 2 is fastened in the card slot of the base 3 to ensure that the limit mechanism 2 does not shake. The lead screw 4 is a cylindrical structure with a through hole on the top. The lead screw 4 cooperates with the hardness tester lead screw. After the base 3 is inserted into the hardness tester lead screw, the lead screw 4 is inserted into the base 3, so that the upper end of the base 3 passes through the through hole on the top of the lead screw 4. The lead screw 4 is tightened on the hardness tester lead screw through the internal thread, so that the entire fixing device is fixed on the hardness tester lead screw.

[0020] During testing, place the bolt head into the hexagonal inner hole of the hexagonal fixture 2-3. After testing the first point, loosen the locking mechanism 1, move the limit mechanism 2 in the slot of the base 3, select a new testing position and tighten it to perform the next point testing. This process can be repeated to achieve the Rockwell hardness test of the bolt.

[0021] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bolt Rockwell hardness test fixture, characterized in that: The fixing device comprises a locking mechanism, a limiting mechanism, a base and a lead screw; wherein the limiting mechanism is used to place the bolt to be tested; the locking mechanism is used to fix the limiting mechanism on the base; the base is used to place the entire fixing device on the lead screw of the hardness tester and ensure that the center line of the device coincides with the center line of the hardness tester; the lead screw is buckled on the base and is used to tighten the entire fixing device on the lead screw of the hardness tester through threads; The locking mechanism includes a handle and a screw, and the handle and the screw are fixed together; the screw can be screwed into the screw hole of the base under the drive of the handle, and the middle position of the clamped part of the hexagonal clamp of the limiting mechanism is supported, so that the limiting mechanism is fastened in the card slot of the base to ensure that the limiting mechanism does not shake; The limiting mechanism includes a bolt, a limiting plate and a hexagonal clamp; wherein the upper part of the hexagonal clamp is provided with a hexagonal inner hole having the same size as the head of the bolt to be measured, and the lower part of the hexagonal clamp has a clamped portion that cooperates with the slot of the base; the limiting plate is fixed to one side of the hexagonal clamp by two bolts; A slot matching the clamped portion of the limit mechanism is provided above the base, a lead screw of a hardness tester is inserted below the base, and a screw hole is processed in the middle of the side of the slot; The lead screw is a cylindrical structure with a through hole on the top. The lead screw cooperates with the hardness tester lead screw. After the hardness tester lead screw is inserted into the base, the lead screw is inserted into the base so that the upper end of the base passes through the through hole on the top of the lead screw. The lead screw is tightened on the hardness tester lead screw through the internal thread, thereby fixing the entire fixing device on the hardness tester lead screw.

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