A device for positioning and preventing oxidation of nail bodies during local heat treatment

Abstract

The device for local heat treatment positioning and oxidation prevention of a nail body fills the inside of a gas cavity with argon and forces air out, a suction head generates negative pressure to suck the nail body, the rod part of the nail body is placed into an induction heater, the tail end of the nail body is sleeved on the top of a positioning center rod, the tail end of the nail body is positioned and supported through the positioning center rod, the suction head rotates to rotate the nail body, and the induction heater generates a magnetic field to electromagnetically heat and heat treat the nail body; during the heat treatment process, the nail body is rotated to change the position of the nail body to obtain different magnetic fluxes, so that the softening area precision of the heat treatment is improved, and the problem that the magnetic flux generated by the heating coil is not uniformly distributed, thereby leading to poor softening area precision of the nail body after the heat treatment in the heating coil is solved.

Description

Technical Field

[0001] This invention relates to a device for local heat treatment positioning and anti-oxidation of rivet bodies, belonging to the technical field of rivet heat treatment devices. Background Technology

[0002] Titanium alloy bulging blind rivets are widely used in the aerospace industry. Localized heat treatment to soften the rivet body is essential for its riveting formation. Precisely controlling the softened area of ​​the rivet body directly affects product performance.

[0003] Existing local heat treatment softening technology for nails (see Chinese Patent Publication No. CN206706156U) can perform heat treatment through a heating coil. However, the magnetic flux generated by the heating coil is not uniformly distributed, resulting in poor precision of the softened area after the nail body has undergone heat treatment within the heating coil. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a device for local heat treatment positioning and anti-oxidation of nail body.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a device for local heat treatment positioning and oxidation prevention of a nail body, comprising: A device that allows the nail to be positioned and supported before being rotated to complete the heat treatment.

[0007] The base includes an air chamber at the top and a mounting chamber at the bottom. A through hole is provided in the middle of the base between the air chamber and the mounting chamber, which connects the air chamber and the mounting chamber. It also includes a positioning tip rod with a stepped tip shape, which can be rotatably installed in the base.

[0008] The base on the side of the gas chamber is provided with an inlet that is connected to an argon gas pipe to fill the gas with argon.

[0009] The base at the top of the air chamber is provided with an induction heater slot for accommodating the induction heater.

[0010] The bottom end of the positioning tip rod is rotatably mounted on the base at the bottom of the air chamber and the bottom of the mounting cavity via bearings A and B, and the bottom end of the positioning tip rod is clearance-fitted with the inner rings of bearings A and B.

[0011] A spring is fitted on the bottom surface of the positioning tip rod step, and the spring is located on the inner ring of bearing A and rotates together with the positioning tip rod; so that the positioning tip rod can obtain a rotational basis on bearing A and bearing B.

[0012] The beneficial effects of this invention are as follows: Argon gas fills the gas chamber and forces out the air, creating negative pressure in the suction head to draw in the nail, placing the rod of the nail into the induction heater. The tail end of the nail contacts and is fitted onto the top of the positioning tip rod, which provides positioning support. The suction head rotates, causing the nail to rotate as well. The induction heater generates a magnetic field to electromagnetically heat the nail for heat treatment. During the heat treatment process, the nail is rotated, which changes its position to obtain different magnetic flux, thereby improving the accuracy of the softening area in the heat treatment. This solves the problem that the magnetic flux generated by the heating coil is not uniformly distributed, resulting in poor accuracy of the softening area after the nail completes heat treatment within the heating coil. Attached Figure Description

[0013] Figure 1 This is a front sectional view of the present invention; Figure 2 This is a front cross-sectional view when the present invention is applied; Figure 3 This is a picture of a product that has undergone oxidation during the nail manufacturing process; Figure 4 These are actual product images showing that the nail body was not oxidized during processing using this invention; In the diagram: 1-base; 11-air chamber; 12-mounting chamber; 13-air inlet; 14-induction heater slot; 2-positioning tip rod; 21-bearing A; 22-bearing B; 23-spring; 3-induction heater; 4-suction head; 5-nail body. Detailed Implementation

[0014] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0015] like Figures 1 to 2 As shown.

[0016] This application discloses a device for local heat treatment positioning and oxidation prevention of a nail body, comprising: The base 1 is made of high-temperature resistant nylon material. The top of the base 1 has an air cavity 11 and the bottom of the base 1 has an installation cavity 12. A through hole is provided in the middle of the base 1 between the air cavity 11 and the installation cavity 12, and the through hole connects the air cavity 11 and the installation cavity 12.

[0017] The base 1 on the side of the gas chamber 11 is provided with an argon gas inlet 13. The inlet 13 is a threaded hole. In use, the inlet 13 and the argon gas tube are connected and sealed by tightening the threaded pair, and the argon gas tube is filled with argon gas.

[0018] The base 1 at the top opening of the air cavity 11 is provided with an induction heater slot 14 for accommodating the induction heater 3.

[0019] It also includes a positioning tip rod 2 with a stepped tip. The bottom end of the positioning tip rod 2 is rotatably mounted on the base 1 at the bottom of the air chamber 11 and the bottom of the mounting cavity 12 via bearings A21 and B22. The bottom end of the positioning tip rod 2 is fitted with the inner ring of bearings A21 and B22 with a clearance of 0.03mm. A spring 23 is fitted on the stepped bottom surface of the positioning tip rod 2. The spring 23 provides elastic stroke to adjust the height of the positioning tip rod 2. The spring 23 is located on the inner ring of bearing A21 and rotates together with the positioning tip rod 2, so that the positioning tip rod 2 can obtain a rotational base on bearings A21 and B22.

[0020] The base 1 is in a fixed state. The induction heater 3 is placed in the induction heater slot 14 of the base 1. The argon gas pipe is connected to the air inlet 13 of the base 1 through the threaded pair and argon gas is introduced. The argon gas fills the gas chamber 11 and forces out the air. The suction head 4 generates negative pressure to pick up the nail body 5, so that the rod of the nail body 5 is placed into the induction heater 3. The tail end of the nail body 5 contacts the top of the positioning tip rod 2. The tail end of the nail body 5 is positioned and supported by the positioning tip rod 2. The head end of the nail body 5 is attracted by the suction head 4. The suction head 4 rotates to rotate the nail body 5. The induction heater 3 generates a magnetic field to electromagnetically induction heat the nail body 5 for heat treatment. During the heat treatment process, both ends of the nail body 5 are supported and the nail body 5 is driven to rotate. The position of the nail body 5 can be changed to obtain different magnetic flux, thereby improving the accuracy of the softening area of ​​the heat treatment. This solves the problem that the magnetic flux generated by the heating coil is not uniformly distributed, resulting in poor accuracy of the softening area after the nail body is heat treated in the heating coil.

[0021] Compared to rotating only the top of the nail body 5, the tail end of the nail body 5 in this application is positioned and supported by the positioning tip rod 2, and the head end of the nail body 5 is held by the suction head 4 and rotated, which avoids the nail body 5 from centrifugal swinging, thereby avoiding the change of the heat treatment softening area of ​​the nail body 5 in the axial direction.

[0022] Meanwhile, during the heat treatment process, because the gap between the rod of the nail body 5 and the induction heater 3 is larger than the gap between the positioning tip rod 2 and the bearings A21 and B22, most of the argon gas is carried away by the rotation of the nail body 5 and discharged from bottom to top. The argon gas fills the gas cavity 11 and forces out the air, forming an argon gas environment in the inner hole of the induction heater, thus preventing oxide scale from forming on the rod of the nail body 5 during heat treatment. Figure 4 Because once oxide scale forms, such as Figure 3 Removing oxide scale not only increases the number of processing steps, but also changes the surface condition and friction coefficient of the nail.

Claims

1. A device for local heat treatment positioning and oxidation prevention of a nail body, characterized in that, include: A device that allows the nail body (5) to be positioned and supported before being rotated to complete the heat treatment.

2. The device for local heat treatment positioning and anti-oxidation of the nail body as described in claim 1, characterized in that: Includes a base (1), with an air cavity (11) at the top and an installation cavity (12) at the bottom. A through hole is provided in the middle of the base (1) between the air cavity (11) and the installation cavity (12), and the through hole connects the air cavity (11) and the installation cavity (12). It also includes a positioning tip rod (2) with a stepped tip shape, which can be rotatably installed in the base (1).

3. The device for local heat treatment positioning and anti-oxidation of the nail body as described in claim 2, characterized in that: The base (1) on the side of the gas chamber (11) is provided with an inlet (13) for filling argon gas into the gas chamber (11) by communicating with the argon gas pipe.

4. The device for local heat treatment positioning and anti-oxidation of the nail body as described in claim 2, characterized in that: The base (1) at the top opening of the air chamber (11) is provided with an induction heater slot (14) for accommodating the induction heater (3).

5. The device for local heat treatment positioning and anti-oxidation of the nail body as described in claim 2, characterized in that: The bottom end of the positioning tip rod (2) is rotatably mounted on the base (1) at the bottom of the air chamber (11) and the bottom of the mounting cavity (12) via bearings A (21) and B (22). The bottom end of the positioning tip rod (2) is in clearance fit with the inner rings of bearings A (21) and B (22).

6. The device for local heat treatment positioning and anti-oxidation of the nail body as described in claim 5, characterized in that: A spring (23) is fitted on the bottom surface of the step of the positioning tip rod (2). The spring (23) is located on the inner ring of bearing A (21) and rotates together with the positioning tip rod (2); so that the positioning tip rod (2) can obtain a rotational basis on bearing A (21) and bearing B (22).

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