Strut bolt quenching and lead bath tempering fixture

Abstract

The utility model relates to a kind of bracing rod bolt quenching and lead bath tempering tool, belong to part dress tool field.A kind of bracing rod bolt quenching and lead bath tempering tool, the tool includes long rod, connecting hook;The handle is set to the one end of long rod, other end is connecting hook;Connecting hook outer diameter is less than the inner diameter of part through-hole, for hanging part.The utility model has the following advantages: this bracing rod bolt quenching and lead bath tempering tool, can quenching and lead bath tempering when carrying out salt furnace quenching and lead bath tempering to multiple parts, while lead bath tempering can be stably placed in lead furnace, not skew, accurate positioning, the part of the thread portion with low strength is tempered, the part without lead bath tempering is not tempered, improve the fatigue strength and service life of bracing rod bolt, reduce the yield strength point of thread area.Simultaneously improve the efficiency of part quenching and lead bath tempering production, ensure the timeliness and quality of part production.

Description

Technical Field

[0001] This utility model relates to a tooling for quenching and lead bath tempering of strut bolts, belonging to the field of parts mounting tooling. Background Technology

[0002] Under repeated static loads, 30CrMnSiNi2A steel bolts are prone to premature failure due to stress concentration at the undercut and threaded sections (the first or second loaded thread section). Therefore, when manufacturing aerospace parts using ultra-high strength steel, targeted heat treatment processes are typically employed to minimize the adverse effects of stress concentration. For stress concentration areas in these steel bolts, short-time tempering is commonly used to reduce the stress concentration factor, thereby improving the bolt's fatigue strength and service life. This process lowers the yield strength point in the surface layer of the stress concentration area (undercut and threaded section). The static strength of the threaded section of 30CrMnSiNi2A steel bolts that have undergone short-time tempering is more than 2.5 times higher than that of bolts that have not.

[0003] Currently, the company uses lead bath tempering as its short-time tempering process, which is characterized by relatively stable temperature. However, since there is no corresponding tooling for lead bath tempering of the strut bolts, each bolt must be tempered individually, which is inefficient. Therefore, it is necessary to design appropriate tooling fixtures. Utility Model Content

[0004] The purpose of this invention is to provide a tooling for quenching and lead bath tempering of strut bolts, thereby improving the efficiency of quenching and lead bath tempering of parts and ensuring the timeliness and quality of parts production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tooling for quenching and lead bath tempering of strut bolts, the tooling including a long rod and a connecting hook; a handle is provided at one end of the long rod, and the other end is a connecting hook; the outer diameter of the connecting hook is smaller than the inner diameter of the through hole of the part, and is used to suspend the part.

[0006] Preferably, a limiting part is provided between the long rod and the connecting hook, which restricts the parts from sliding toward the handle.

[0007] Preferably, there are at least two connecting hooks, arranged sequentially along the limiting part, with a distance maintained between adjacent connecting hooks to avoid mutual interference between the suspended parts.

[0008] Preferably, a hook is provided at the end of the connecting hook away from the long rod, and the hook is tilted upward to prevent the suspended parts from slipping.

[0009] Preferably, the handle is formed by bending the end of a long rod.

[0010] Preferably, the tooling is made of carbon structural steel No. 45.

[0011] Compared with existing technologies, this utility model has the following advantages: This strut bolt quenching and lead bath tempering fixture allows multiple parts to be quenched and tempered simultaneously during salt furnace quenching and lead bath tempering. During lead bath tempering, the parts are stably placed in the lead furnace without tilting, ensuring precise positioning. Tempering is performed only on threaded areas requiring low strength, while areas not requiring lead bath tempering are left untempered, thus improving the fatigue strength and service life of the strut bolt and lowering the yield strength point in the threaded area. It also improves the efficiency of parts quenching and lead bath tempering production, ensuring timely and high-quality parts production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0013] Figure 2 This is a diagram showing the usage state of an embodiment of this utility model;

[0014] Figure 1-2 In the middle, 1. strut bolt parts; 2. threaded parts; 3. through holes; 4. connecting hooks; 5. hooks; 6. long rods; 7. handles. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1-2 The present invention is further described in detail as follows: a tooling for quenching and lead bath tempering of a strut bolt, the tooling including a long rod 6 and a connecting hook 4; a handle is provided at one end of the long rod 6 and the connecting hook 4 is at the other end; the outer diameter of the connecting hook 4 is smaller than the inner diameter of the through hole 3 of the part, and is used to suspend the part; a hook 5 is provided at the end of the connecting hook 4 away from the long rod, the hook 5 is tilted upward to prevent the suspended part from slipping.

[0016] As a preferred embodiment of this invention, the fixture is designed to hold multiple parts for lead bath tempering at once. Therefore, two connecting hooks 4 are designed, such as... Figure 1-2 As shown, the strut bolt part 1 is fixed by passing through the part through hole 3 and the connecting hook 4 of the tooling fixture. The length of the connecting hook 4 depends on the size and width of the through hole 3 and the effective heating size of the lead furnace. One connecting hook 4 can hold multiple parts, and the hook 5 prevents the parts from falling and acts as a stop. Due to the high temperature of lead bath tempering, the operator needs to maintain a certain distance. The long rod 6 connecting the two connecting hooks 4 needs to be relatively long and bend into a handle 7 to facilitate the operator's hand to put in and lift the tooling. The handle needs to be smoothly rounded to avoid hand discomfort. This ensures that the part requiring lead bath tempering (the threaded part 2) is perpendicular to the molten lead and will not be skewed. This allows the part requiring lead bath tempering to be tempered, while the part not requiring lead bath tempering is not tempered, ensuring the accuracy of the thread lead bath tempering.

[0017] The tooling is made of high-quality carbon structural steel No. 45, which has small deformation and excellent mechanical properties.

[0018] This fixture is not limited to lead bath tempering fixtures; it can also be used in salt furnace quenching. Parts can be tied together with wire and attached to the connecting hooks, or the parts can be placed in the quenching basket and hung on the connecting hooks. Two rows of connecting hooks can hold more parts, greatly improving production efficiency.

[0019] Instructions for use: The strut bolt part 1 is fixed by passing through the through hole 3 of the part and then through the connecting hook 4 of the tooling fixture. The length of the connecting hook 4 depends on the size and width of the through hole 3 of the strut bolt part 1 and the effective heating size of the lead furnace. One connecting hook 4 can hold multiple strut bolt parts 1. The hook 5 prevents the strut bolt parts 1 from falling and acts as a stop. Due to the high tempering temperature of the lead bath, the operator needs to maintain a certain distance. The long rod 6 connecting the two connecting hooks 4 needs to be relatively long and bend into a handle 7 so that the operator can easily put their hand in to lift the long rod 6. The handle 7 needs to be smoothly rounded to avoid hand discomfort. This ensures that the part of the strut bolt part 1 that needs to be tempered in the lead bath (the threaded part 2) is perpendicular to the molten lead and will not be skewed. This allows the part that needs to be tempered in the lead bath to be tempered, while the part that does not need to be tempered will not be tempered, ensuring the accuracy of the tempering of the threaded part 2 in the lead bath.

Claims

1. A fixture for quenching and lead bath tempering of strut bolts, characterized in that: The tooling includes a long rod and a connecting hook; one end of the long rod is provided with a handle, and the other end is a connecting hook; the outer diameter of the connecting hook is smaller than the inner diameter of the through hole of the part, and it is used to suspend the part.

2. The tooling for quenching and lead bath tempering of strut bolts according to claim 1, characterized in that: A limiting part is provided between the long rod and the connecting hook to restrict the parts from sliding toward the handle.

3. The tooling for quenching and lead bath tempering of strut bolts according to claim 2, characterized in that: There are at least two connecting hooks, arranged sequentially along the limiting part, with a distance maintained between adjacent connecting hooks to avoid mutual interference between the suspended parts.

4. The tooling for quenching and lead bath tempering of strut bolts according to claim 1, characterized in that: A hook is installed at the end of the connecting hook away from the long rod, with the hook pointing upwards to prevent the suspended parts from slipping.

5. The tooling for quenching and lead bath tempering of strut bolts according to claim 1, characterized in that: The handle is made by bending the end of a long rod.

6. The tooling for quenching and lead bath tempering of strut bolts according to claim 1, characterized in that: The tooling is made of carbon structural steel No. 45.

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