Induction heat treating of parts

Abstract

The utility model discloses a kind of induction heat treatment part heat conduction protection devices, belong to heat treatment technical field.It includes fixed block, heat conduction block and connecting bolt, fixed block is right trapezoidal shape block, the slope of fixed block is upward;The slope of fixed block is provided with a heat conduction block, heat conduction block is fixedly connected on the slope of fixed block by four connecting bolts;Four threaded holes are equipped on the slope of fixed block, four counterbores are correspondingly provided in heat conduction block, connecting bolt is cooperated and is screwed in each threaded hole by passing through respective corresponding counterbores;Heat conduction block and connecting bolt are all T2 material, heat conduction block thickness is greater than 10mm, fixed block is carbon structural steel material, the outer contour of fixed block is attached with part inner cavity.The utility model manages and balances the temperature distribution of the part to be treated by active heat conduction and heat capacity control, prevents the target area from generating undesirable heat treatment effect, protects precision site, makes quenching process not produce crack and deformation, improves product quality.

Description

Technical Field

[0001] This utility model relates to a thermal protection device for induction heat treatment parts, belonging to the field of heat treatment technology. Background Technology

[0002] Induction heat treatment utilizes the principle of electromagnetic induction to generate eddy currents inside the workpiece. These eddy currents produce a "Joule heating" effect, heating the surface or the entire workpiece to the required temperature in a very short time. The workpiece is then rapidly cooled, thereby altering its microstructure and properties.

[0003] During induction heating, the temperatures at sharp corners and edges of parts are abnormally high. This is mainly due to electromagnetic field concentration, skin effect, and eddy current paths. Additionally, the high temperatures generated at sharp corners dissipate heat from the air much slower than in other parts of the part (the metal body absorbs heat), resulting in significantly higher temperatures at the sharp corners compared to other areas. This sharp corner effect can cause numerous manufacturing problems, specifically as follows: 1) Overheating or burning: The temperature at the sharp corners may far exceed the process requirements, resulting in coarse grains or even local melting, which seriously deteriorates the material properties; 2) Quenching cracks: During the subsequent quenching and cooling process, the overheated area and the surrounding area generate huge structural stress and thermal stress, which can easily form stress concentration at sharp corners, leading to the generation of quenching cracks. 3) Uneven microstructure and properties; the hardness and microstructure of different parts of the workpiece vary too much, affecting the overall service life and reliability.

[0004] One of the key components of artillery is a thin-walled structure. The component is thin and has sharp corners, with the tip being only 1mm thick. The sharp corners of the component require surface heat treatment. Due to the characteristics of induction heat treatment, this component is prone to cracking and deformation during quenching. The pass rate of conventional induction heat treatment can only reach 30%. Utility Model Content

[0005] To overcome the shortcomings of the existing technology, this utility model provides a thermal protection device for induction heat treatment parts. During the induction heat treatment process, the device manages and balances the temperature distribution of the treated parts through active heat conduction and heat capacity control, prevents undesirable heat treatment effects in the target area, protects precision parts, prevents cracks and deformation during the quenching process, improves product quality, and ensures production progress.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a heat conduction protection device for induction heat treatment parts, including a fixing block, a heat conduction block and connecting bolts. The fixing block is a block in the shape of a right trapezoid with the inclined surface of the fixing block facing upward. A heat conduction block is provided on the inclined surface of the fixing block, and the heat conduction block is fixedly connected to the inclined surface of the fixing block by four connecting bolts.

[0007] Furthermore, both the heat-conducting block and the connecting bolts are made of T2 material, and the thickness of the heat-conducting block is greater than 10mm.

[0008] Furthermore, the fixing block is made of carbon structural steel.

[0009] Furthermore, the outer contour of the fixing block fits into the inner cavity of the part.

[0010] Furthermore, the inclined surface of the fixing block is provided with four threaded holes, and the heat-conducting block is provided with four countersunk holes accordingly. The connecting bolts are threaded into each threaded hole by passing through their respective countersunk holes.

[0011] The beneficial effects of this utility model are as follows: This utility model improves process quality and product consistency through heat conduction, effectively evens and dissipates heat, and avoids overheating and burning caused by heat concentration at sharp corners and edges, thereby obtaining a hardened layer with uniform depth and hardness; through the fixed support during the quenching process, the heat treatment deformation of the workpiece is significantly reduced, the overall yield of parts is increased to 99%, rework and scrap costs are significantly reduced, the device has a long service life, and maintenance and operation are simple, achieving the best use effect.

[0012] During induction heat treatment, this thermal protection device manages and balances the temperature distribution of the parts being treated through active heat conduction and heat capacity control, preventing undesirable heat treatment effects in the target area, protecting precision parts, preventing cracks and deformation during the quenching process, improving product quality, and ensuring production progress. Attached Figure Description

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

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a front view of the heat-conducting block of this utility model.

[0016] Figure 3 yes Figure 2 Top view.

[0017] Figure 4 This is the front view of the fixing block of this utility model.

[0018] Figure 5 yes Figure 4 Top view.

[0019] Figure 6 This is a schematic diagram of the connecting bolt of this utility model.

[0020] Figure 7 This is a schematic diagram of the present invention in a part.

[0021] Numbering on the map: 1. Fixing block, 101. Threaded hole, 2. Heat-conducting block, 201. Countersunk hole, 3. Connecting bolt, 4. Parts. Detailed Implementation

[0022] like Figure 1 As shown in Figure 7, a heat-conducting protection device for induction heat treatment parts includes a fixing block 1, a heat-conducting block 2, and connecting bolts 3. The fixing block 1 is a right-angled trapezoidal block with its inclined surface facing upward. A heat-conducting block 2 is provided on the inclined surface of the fixing block 1, and the heat-conducting block 2 is fixedly connected to the inclined surface of the fixing block 1 by four connecting bolts 3. The inclined surface of the fixing block 1 is provided with four threaded holes 101, and the heat-conducting block 2 is provided with four countersunk holes 201. The connecting bolts 3 are threaded through their respective countersunk holes 201 and connected to the threaded holes 101.

[0023] Both the heat-conducting block 2 and the connecting bolt 3 are made of T2 material. The thickness of the heat-conducting block 2 is greater than 10mm. The fixing block 1 is made of carbon structural steel. The outer contour of the fixing block 1 fits the inner cavity of the part.

[0024] The upper surface of the inclined surface of the heat-conducting block 2 is perfectly aligned with the size of the part 4. While absorbing excess heat, the material of the heat-conducting block 2 itself does not generate heat. The fixing block 1 is made of carbon structural steel, which reduces the production cost of the device. The size of the fixing block 1 is aligned with the inner cavity of the part 4, which can effectively ensure the relative position of the thermal protection device structure and the part 4.

[0025] The device, made of a high thermal conductivity material (such as pure copper, brass, or aluminum alloy), is tightly inserted into part 4 and in direct contact with part 4. Because copper has extremely low resistivity, the magnetic field penetrates very deeply, the induced eddy currents are very small, and the heat generated is very little. More importantly, as a highly efficient heat sink, it can quickly conduct away the heat accumulated at the edge of part 4 and diffuse it throughout the entire device, thereby significantly reducing the actual temperature of the sharp corner edge, preventing it from reaching overheating or burning temperatures, and avoiding cracks caused by excessively high temperatures and intense cooling during the cooling process.

[0026] How to use: 1. Before heating and quenching part 4, place the heat-conducting protective device inside the cavity of part 4, ensuring it fits tightly against the inner cavity of part 4. 2. Use induction heat treatment equipment to quench the surface of part 4; 3. After heating is complete, the heat conduction protection device is quenched and cooled together with part 4; 4. After the heating and quenching are completed, the heat conduction protection device can be removed from part 4.

[0027] If the heat-conducting block 2 of the heat-conducting protection device deforms after multiple processing steps, the heat-conducting block 2 can be replaced without the need to manufacture a new heat-conducting protection device, thus effectively saving processing costs.

Claims

1. A thermal conductivity protection device for induction heat treatment parts, characterized in that: It includes a fixing block (1), a heat-conducting block (2) and connecting bolts (3). The fixing block (1) is a block in the shape of a right trapezoid with the inclined surface of the fixing block (1) facing upward. A heat-conducting block (2) is provided on the inclined surface of the fixing block (1), and the heat-conducting block (2) is fixedly connected to the inclined surface of the fixing block (1) by four connecting bolts (3).

2. The thermal conductivity protection device for induction heat treatment parts according to claim 1, characterized in that: The heat-conducting block (2) and the connecting bolt (3) are both made of T2 material, and the thickness of the heat-conducting block (2) is greater than 10mm.

3. The thermal conductivity protection device for induction heat treatment parts according to claim 1, characterized in that: The fixing block (1) is made of carbon structural steel.

4. The thermal conductivity protection device for induction heat treatment parts according to claim 1, characterized in that: The outer contour of the fixing block (1) fits into the inner cavity of the part (4).

5. The thermal conductivity protection device for induction heat treatment parts according to claim 1, characterized in that: The inclined surface of the fixing block (1) is provided with four threaded holes (101), and the heat-conducting block (2) is provided with four countersunk holes (201). The connecting bolts (3) are threaded through their respective countersunk holes (201) and connected to each threaded hole (101).

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