CN113293346A

CN113293346A - Long-barrel-shaped part heat treatment carburization inner hole protection device and protection method

Info

Publication number: CN113293346A
Application number: CN202110547039.5A
Authority: CN
Inventors: 李向利; 杨平; 陈素明
Original assignee: AVIC Xian Aircraft Industry Group Co Ltd
Current assignee: AVIC Xian Aircraft Industry Group Co Ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-08-24

Abstract

The invention discloses a long cylindrical part heat treatment carburization inner hole protection device and a protection method. And sleeving the long cylindrical part on the outer side of the pull rod, sealing the lower end of the long cylindrical part with the annular groove of the base, and sealing the upper end of the long cylindrical part with the pull rod to perform carburization. The invention solves the problems of difficult protection and poor effect of the heat treatment carburization inner hole of the cylindrical part. And the protection device also has a certain deformation-preventing effect, is simple and quick to operate, and ensures the production quality of parts.

Description

Long-barrel-shaped part heat treatment carburization inner hole protection device and protection method

Technical Field

The invention relates to the field of heat treatment of airplane parts, in particular to a long-cylinder-shaped part heat treatment carburization inner hole protection device and a protection method.

Background

Currently, in aeronautic manufacturing, carburization is widely applied because high-hardness wear-resistant surfaces can be provided, actual parts are often carburized only in local parts in wear-resistant contact, and the rest surfaces, particularly inner surfaces or inner holes which do not need high wear resistance, do not need to be carburized because good toughness needs to be maintained. When a part is carburized, it is necessary to protect the surface of the part that does not need to be carburized from deterioration in toughness due to carburization by carburizing. The traditional carburization protection method comprises the following steps: the method comprises the steps of brushing anti-carburizing paint, plating copper, reserving machining allowance larger than the carburizing depth and the like, for cylindrical parts with long inner holes, such as screws and the like, the anti-carburizing paint is difficult to operate when the inner holes which are not carburized are brushed, the plating copper is easy to be uneven, the protection effect is poor, the hardness of the surface of the inner holes which are carburized is high due to the reserved machining allowance, the inner hole machining is difficult, and how to solve the problems becomes the key for solving the carburizing production of the long cylindrical parts.

Disclosure of Invention

Aiming at the current situation of protecting the heat treatment carburization inner hole of the long cylindrical part in the prior art, the invention aims to provide a heat treatment carburization inner hole protection device and a protection method for the long cylindrical part, which can simply and efficiently protect the inner hole when the long cylindrical part is subjected to heat treatment carburization, and ensure the product quality.

The utility model provides a long tube-shape part thermal treatment carburization hole protection device which characterized in that, the device contains base and pull rod, the pull rod is fixed in on the base, the base have the chamber that sinks, the lower extreme of pull rod is connected at the center that the chamber that sinks of base, makes the pull rod lower extreme outside form the annular groove, the width of annular groove is greater than the wall thickness of long tube-shape part, the external diameter of pull rod is less than the internal diameter of long tube-shape part, the length of pull rod is greater than the height of long tube-shape part, the pull rod upper end is equipped with the hole for hoist.

A long cylindrical part heat treatment carburization inner hole protection method is characterized by comprising the following steps: 1) the long cylindrical part heat treatment carburization inner hole protection device is used; 2) sleeving a long cylindrical part on the outer side of the pull rod, and inserting the lower end of the long cylindrical part into the annular groove of the base; 3) sealing a gap between the annular groove of the base and the lower end of the long cylindrical part, and sealing a gap between the upper port of the long cylindrical part and the pull rod;

4) and lifting the long cylindrical part and the protection device into the heat treatment furnace through the lifting hole at the upper end of the pull rod to perform carburization treatment.

The invention has the beneficial effects that: the novel method for protecting the carburized inner hole of the long cylindrical part through heat treatment is provided, the problems that the traditional methods for brushing anti-carburizing paint on the inner hole, plating copper and the like are difficult to brush in place, the coating (plating) layer is difficult to be uniform, and the protection effect is poor are solved, the protection device has a certain deformation prevention effect, can be used as a hanging clamp to solve the hanging problem in a long cylindrical part heat treatment furnace, is simple and rapid to operate, and ensures the production quality of the part.

The present application is described in further detail below with reference to the accompanying drawings of embodiments.

Drawings

FIG. 1 is a schematic structural view of a long cylindrical part.

FIG. 2 is a schematic structural diagram of a long cylindrical part heat treatment carburization inner hole protection device.

FIG. 3 is a schematic diagram of a long cylindrical part heat treatment carburization inner hole protection method.

The numbering in the figures illustrates: 1 long cylindrical part, 2 pull rods, 3 bases, 4 annular grooves, 5 hoisting holes, 6 sandy soil and 7 asbestos.

Detailed Description

Referring to the drawings, the present application is directed to a long cylindrical part as shown in fig. 1, which has a deep and thin inner bore, and the heat-treated carburized inner bore protection of this type of part cannot be achieved using the prior art. For this reason long tube-shape part heat treatment carburization hole protection device that this application provided is shown in fig. 2, and the device contains base 3 and pull rod 2, and pull rod 2 is fixed in on the base 3, base 3 be the open-ended basin form in upper end, have the chamber that sinks, the center in the chamber that sinks of base 3 is connected to the lower extreme of pull rod 2, makes pull rod 2 lower extreme outside form annular groove 4, the width of annular groove 4 is greater than the wall thickness of long tube-shape part 1, the external diameter of pull rod 2 is less than the internal diameter of long tube-shape part 1, the length of pull rod 2 is greater than the height of long tube-shape part 1, pull rod 2 upper end still is equipped with hole for hoist 5.

When the outer surface of the long cylindrical part 1 is carburized, the long cylindrical part 1 is sleeved outside a pull rod 2 of a protection device, and the lower end of the long cylindrical part 1 is inserted into an annular groove 4 of a base 3; the annular groove 4 of the base 3 and the lower end of the long cylindrical part 1 are sealed, and in implementation, the gap between the annular groove of the base and the lower end of the long cylindrical part is filled with sandy soil 6 to seal the gap conveniently; then, sealing the upper port of the long cylindrical part 1 and the pull rod; in the implementation, the asbestos 7 band dipped with water glass is preferably used for tightly plugging and sealing the upper port of the long cylindrical part and the pull rod, so that the upper and lower ports of the inner hole of the long cylindrical part are sealed. And finally, hoisting the long cylindrical part 1 and the protection device into a heat treatment furnace through a hoisting hole 5 at the upper end of the pull rod 2 for carburization.

Claims

1. The utility model provides a long tube-shape part thermal treatment carburization hole protection device which characterized in that, the device contains base and pull rod, the pull rod is fixed in on the base, the base have the chamber that sinks, the lower extreme of pull rod is connected at the center that the chamber that sinks of base, makes the pull rod lower extreme outside form the annular groove, the width of annular groove is greater than the wall thickness of long tube-shape part, the external diameter of pull rod is less than the internal diameter of long tube-shape part, the length of pull rod is greater than the height of long tube-shape part, the pull rod upper end is equipped with the hole for hoist.

2. A long cylindrical part heat treatment carburization inner hole protection method is characterized by comprising the following steps: 1) heat treating a carburized bore protector using a long cylindrical part as in claim 1; 2) sleeving a long cylindrical part on the outer side of the pull rod, and inserting the lower end of the long cylindrical part into the annular groove of the base; 3) sealing the annular groove of the base and the lower end of the long cylindrical part, and sealing the upper port of the long cylindrical part and the pull rod; 4) and lifting the long cylindrical part and the protection device into the heat treatment furnace through the lifting hole at the upper end of the pull rod to perform carburization treatment.

3. The method for protecting the inner bore of the long cylindrical part subjected to heat treatment carburization according to claim 2, characterized in that sand is used to fill up the gap between the annular groove of the base and the lower end of the long cylindrical part for sealing.

4. The method for protecting the inner bore of the long cylindrical part subjected to heat treatment carburization according to claim 2, characterized in that a asbestos tape dipped with water glass is used for tightly plugging, sealing and sealing the upper end opening of the long cylindrical part and the pull rod.