Sheet metal heat treatment anti-deformation tooling

Abstract

This utility model belongs to the field of tooling design for heat treatment furnaces, specifically relating to quenching and tempering tooling suitable for heat treatment equipment. A tooling for preventing deformation during heat treatment of thin plates includes a quenching tooling and a tempering tooling. The quenching tooling includes an upper base plate and a lower base plate with identical shapes. The upper base plate has a through hole A for a positioning pin to pass through, and the lower base plate has several positioning pins with through holes B along the radial direction of the positioning pins for positioning components to pass through. The thin plate is placed on the lower base plate, and the upper base plate is placed on top, with the positioning components passing through the through holes B to position the three components. The tempering device includes an upper plate and a lower plate with identical shapes. The upper plate has a through hole C for a positioning pin to pass through, and the lower plate has two positioning pins arranged diagonally, with through holes B along the radial direction of the positioning pins for positioning components to pass through. This utility model improves the heat treatment quality of products, alleviates the workload of calibration workers, and increases production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of tooling design for heat treatment furnaces, specifically relating to quenching and tempering tooling suitable for heat treatment equipment. Background Technology

[0002] During heat treatment, due to the unique nature of hot working, rapid oil cooling at high temperatures creates a significant internal temperature gradient in parts, leading to residual stress after cooling. Thin sheet metal parts, being thinner than other types of parts, are more prone to reaching their yield strength due to the generated thermal and residual stresses, resulting in deformation. The thermal deformation of thin sheet metal parts exhibits randomness depending on the distribution of thermal stress, potentially manifesting as bending, twisting, or warping. Quenched thin sheet metal parts have high strength but reduced toughness, significantly increasing the difficulty of correction and easily rendering the parts unusable. Even if corrected and delivered, it severely impacts production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a heat treatment anti-deformation fixture for thin plates, which is applicable to existing heat treatment equipment. It controls the deformation of thin plates during the quenching and tempering processes, minimizes the amount of deformation, reduces the difficulty of correction, and improves production efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a heat treatment anti-deformation fixture for thin plates, comprising a quenching fixture and a tempering fixture; the quenching fixture comprises an upper base plate and a lower base plate with identical shapes, a through hole A for a positioning pin to pass through is provided on the upper base plate, and a plurality of positioning pins are provided on the lower base plate, the positioning pins are evenly distributed, and a through hole B for a positioning element to pass through is provided along the radial direction of the positioning pins; the thin plate is placed on the lower base plate, and the upper base plate is placed on top, with the positioning element passing through the through hole B to position the three; the tempering device comprises an upper plate and a lower plate with identical shapes, a through hole C for a positioning pin to pass through is provided on the upper plate, and two positioning pins are provided on the lower plate, the positioning pins are diagonally arranged, and a through hole B for a positioning element to pass through is provided along the radial direction of the positioning pins; the thin plate is placed on the lower plate, and the upper plate is placed on top, with the positioning element passing through the through hole B to position the three.

[0005] Preferably, several holes are formed on the upper and lower base plates, and the holes are evenly distributed throughout the tooling.

[0006] Preferably, through holes for the material frame support rods are provided on the upper and lower base plates.

[0007] Preferably, expansion joints are provided at the edges of the upper and lower base plates, and the number of expansion joints is multiple.

[0008] Preferably, both the upper and lower base plates are circular; or both the upper and lower plates are rectangular.

[0009] Preferably, the four corners of the upper and lower plates are rounded.

[0010] Preferably, an earring is installed on the positioning pin to facilitate hoisting by the gantry crane.

[0011] Preferably, handles are provided on both sides of the upper plate to facilitate manual handling and installation.

[0012] Preferably, the through hole B is a square hole; the positioning element is a wedge.

[0013] Preferably, heat-resistant steel is selected as the tooling material.

[0014] Compared with the prior art, this utility model has the following advantages: After the application of this set of quenching and tempering fixtures for thin plates, the thin plates can be easily corrected or even delivered to the next process without correction, and the mechanical properties can also meet the design requirements. It solves the problem of large deformation of existing thin plates, improves the heat treatment quality of products, relieves the work pressure of correction workers, improves production efficiency, reduces production costs, and shortens the production cycle. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the quenching tooling assembly structure in an embodiment of this utility model;

[0016] Figure 2 yes Figure 1 Schematic diagram of the upper and middle bottom plate structure;

[0017] Figure 3 yes Figure 1 Schematic diagram of the middle and lower base plate structure;

[0018] Figure 4 yes Figure 1 Schematic diagram of the middle wedge structure;

[0019] Figure 5 This is a schematic diagram of the tempering tooling assembly structure in an embodiment of this utility model;

[0020] Figure 6 yes Figure 5 Schematic diagram of the upper and middle plates;

[0021] Figure 7 yes Figure 5 Schematic diagram of the middle and lower plate structure;

[0022] Figure 1 , 5 In the middle, 1. Suction fixture for thin plate parts; 2. Hole design; 3. Expansion joint; 4. Through hole for material frame support rod; 5. Positioning pin; 6. Wedge; 7. Tempering fixture for thin plate parts; 8. Positioning pin; 9. Positioning pin ear; 10. Handle. Detailed Implementation

[0023] The following is in conjunction with the appendixFigures 1-7 The present invention is further described in detail as follows: a heat treatment anti-deformation fixture for thin plate parts, including a quenching fixture and a tempering fixture;

[0024] like Figures 1-4 As shown, the quenching fixture 1 for thin plates:

[0025] The deformation of the thin sheet metal is controlled by physical restraint. The thin sheet metal is placed on a lower base plate, while an upper base plate is placed on top. The lower base plate is equipped with four positioning pins 5 to ensure accurate positioning of the upper and lower base plates. The positioning pins 5 have holes, and the two base plates are tightly fitted by wedges 6 inserted into the positioning pin holes. This design prevents the wedges 6 from being unable to be removed after thermal deformation, thus avoiding the inability to disassemble the quenching fixture 1 to remove the part. Under the weight of the upper base plate and the compressive force of the wedges 6, the deformation of the thin sheet metal can be effectively controlled.

[0026] Considering that the tight fit between the two base plates and the part during quenching increases the required thickness, exceeding the part's hardening thickness, the quenching fixture is designed with openings 2. These openings are distributed throughout the fixture to ensure airflow during heat treatment, resulting in uniform heating. Furthermore, during oil quenching, oil can penetrate through the openings, ensuring timely cooling and allowing the part to be fully quenched. This design also saves material, making the fixture lighter and effectively reducing unnecessary energy loss during heat treatment, thus saving energy costs. Additionally, the openings on the upper and lower base plates are positioned correspondingly to prevent deformation of the thin plate due to one side having a flat plate support and the other side lacking one.

[0027] To maximize furnace loading, the quenching fixture will be designed based on the existing production line's material frame dimensions, with both the upper and lower base plates being circular. To improve the fixture's durability, its dimensions will be thickened without exceeding the quenching thickness, to cope with deformation and cracking caused by continuous thermal expansion and contraction.

[0028] To accommodate existing material frames, through holes 4 are provided on the upper and lower base plates to accommodate the material frame support rods. The diameter of the through holes is slightly larger than the diameter of the material frame support rods for easy installation.

[0029] Taking into full account the stress distribution of the tooling and the space reserved for thermal expansion and contraction, four uniform expansion joints are opened on the edge of the tooling to guide the quenching tooling to effectively release stress and reduce the possibility of deformation and cracking.

[0030] Additionally, positioning pin earrings 9 are installed on the four positioning pins 5 to facilitate the use of gantry cranes to hang the fixtures and save manpower.

[0031] like Figures 5-7 As shown, the tempering fixture 7 for thin sheet metal parts:

[0032] For production flexibility, the dimensions of the sheet metal tempering fixture 7 should be compatible with all tempering equipment. The fixture consists of an upper plate and a lower plate, both rectangular. Two locating pins 8 are positioned diagonally on the lower plate, with corresponding holes on the upper plate to control accurate positioning of the upper and lower plates. Holes are also present on the locating pins 8. Wedges 6 are inserted into the locating pin holes to ensure a tight fit. Under the weight of the upper plate and the compressive force of the wedges, deformation of the sheet metal can be effectively controlled. This design prevents the wedges 6 from becoming irremovable after thermal deformation, thus avoiding the inability to disassemble the sheet metal tempering fixture 7 to remove parts.

[0033] Handles 10 are provided on both sides of the upper plate for easy manual handling and installation; positioning pin earrings 9 are provided on the two positioning pins 8 of the lower plate for easy hoisting by gantry crane and to save manpower.

[0034] Compared to the quenching fixture 1, the thin plate tempering fixture 7 has no opening design, which can better suppress the deformation of the thin plate. If the part is slightly deformed after quenching, the thin plate tempering fixture 7 can be used to press (applying pressing force by hammering the wedge) to achieve a certain correction effect.

[0035] The rounded corners of the tempering fixture prevent injuries from bumps and knocks. Furthermore, compared to quenching fixtures, its smaller size gives the tempering fixture greater flexibility and makes it suitable for other tempering furnaces.

[0036] Calculate the required thickness based on the actual dimensions of the quenching and tempering fixtures and parts after installation, and extend the quenching and tempering holding time.

[0037] Considering the impact and wear during the production process, as well as the need to cope with repeated high-temperature heating and rapid cooling, heat-resistant steel was selected as the tooling material.

[0038] The above embodiments are merely preferred embodiments of this utility model and do not constitute a limitation thereof. Any extensions, modifications, etc., made by those skilled in the art without departing from the principle of this utility model should be included within the protection scope of this utility model.

Claims

1. A heat treatment anti-deformation fixture for thin sheet metal, characterized in that: The apparatus includes quenching fixtures and tempering fixtures. The quenching fixture includes an upper base plate and a lower base plate with identical shapes. The upper base plate has a through hole A for a positioning pin to pass through, and the lower base plate has several positioning pins evenly distributed, with through holes B along the radial direction of the positioning pins for a positioning element to pass through. A thin sheet is placed on the lower base plate, and the upper base plate is placed on top of it. The positioning element passes through the through hole B to position the three parts. The tempering apparatus includes an upper plate and a lower plate with identical shapes. The upper plate has a through hole C for a positioning pin to pass through, and the lower plate has two positioning pins diagonally arranged, with through holes B along the radial direction of the positioning pins for a positioning element to pass through. A thin sheet is placed on the lower plate, and the upper plate is placed on top of it. The positioning element passes through the through hole B to position the three parts.

2. The heat treatment anti-deformation fixture for thin sheet metal parts according to claim 1, characterized in that: Several holes are evenly distributed throughout the tooling on the upper and lower base plates.

3. The heat treatment anti-deformation fixture for thin sheet metal parts according to claim 1, characterized in that: Through holes for the material frame support rods are provided on the upper and lower base plates.

4. The heat treatment anti-deformation fixture for thin plates according to claim 1, characterized in that: Expansion joints are provided at the edges of the upper and lower base plates, and there are multiple expansion joints.

5. The heat treatment anti-deformation fixture for thin sheet metal parts according to claim 1, characterized in that: Both the top and bottom plates are circular; both the top and bottom plates are rectangular.

6. The heat treatment anti-deformation fixture for thin sheet metal parts according to claim 5, characterized in that: The four corners of the upper and lower plates are rounded.

7. The heat treatment anti-deformation fixture for thin sheet metal parts according to claim 1, characterized in that: Earrings are installed on the positioning pins to facilitate hoisting by the gantry crane.

8. The heat treatment anti-deformation fixture for thin sheet metal parts according to claim 1, characterized in that: Handles are provided on both sides of the upper plate for easy manual handling and installation.

9. The heat treatment anti-deformation fixture for thin sheet metal parts according to claim 1, characterized in that: Through hole B is a square hole; the positioning element is a wedge.

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