Hoisting fixture for heat treatment of slender thin-walled cylinder parts

Abstract

The utility model discloses a heat treatment hoisting clamp for slender thin-walled cylinder parts, and belongs to the technical field of machinery. The device comprises a disc, lacing wires, hanging rings and auxiliary fixing ribs, the hanging rings are arranged at the top of the disc at intervals, the lower half portion of each hanging ring is fixedly connected with one end of one lacing wire, the lacing wires are evenly arranged in the circumferential direction of the hanging rings at intervals, the other ends of the three lacing wires are fixedly connected with the top of the disc, and the lacing wires are arranged in the inclined direction; the number of the auxiliary fixing ribs is eight, and after the part is attached to the bottom face of the disc, the auxiliary fixing ribs are arranged in the vertical direction, evenly distributed in the circumferential direction of the attaching position of the part and the disc at intervals and fixed to the part and the disc in a welded mode. According to the utility model, the clamping problem in the heat treatment process of the slender thin-walled cylinder part can be solved, the deformation of the part is effectively controlled and reduced, the use requirement of the part is met, the quality of the part is ensured, and the operation difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of slender thin-walled cylinder class parts heat treatment hoisting fixture, belong to mechanical technical field. BACKGROUND

[0002] In artillery products, there is slender thin-walled cylinder class parts in cradle mechanism, the wall thickness of this part is 3-5mm, the outer circle diameter is only 356mm, the length reaches 1000mm, the yield strength requirement of heat treatment is greater than 830Mpa, the part is generally rolled, welded into shape after quenching and tempering heat treatment, to improve the strength of the part.

[0003] Such parts have the following difficulties in the production process:

[0004] 1) unable to heat treatment after rolling

[0005] The diameter of this part is small, and the rolling of this specification is difficult, and the performance requirement of the part is higher, and the yield strength requirement is greater than 830Mpa, if the steel plate is first heat treated to meet the performance requirement and then rolled, the pressure requirement of the rolling machine is higher, and the performance of the part is high, and the elasticity is large during rolling, and the forming is difficult. When welding after forming, the heat generated during the welding process will produce a heat affected zone near it, which will cause local annealing in this part, reducing the performance of the part, so the part can only be produced by rolling first and then heat treating;

[0006] 2, unable to correct after heat treatment

[0007] The part is slender and thin-walled, and during the heat treatment heating and cooling process, it will generate a large stress, causing the part to deform, and the deformation trend is mainly diameter direction oval, length direction bending, and the wall thickness of the part is only 3mm, so the length direction bending of the part is corrected, which will cause the oval of the part to be more serious, and the oval correction can only be performed on the outer surface of the part, and the inner surface diameter is too small, so the correction equipment tooling cannot enter the part to press the inner surface outward, so the correction is difficult;

[0008] 3, deformation control during heat treatment

[0009] Based on the above reasons, the deformation control during heat treatment is the biggest difficulty in the production of the part, due to the material quality of the part, the heat treatment process parameters of the part cannot be optimized, and only the loading method, clamping method, etc. can be optimized.

[0010] The traditional heat treatment part clamping mode is generally vertical basket clamping or direct welding of a reinforcing bar, the vertical basket clamping mode is generally applied to a trolley heat treatment furnace, parts are placed at the bottom of a quenching basket, the temperature can reach above 850 DEG C during heat treatment, the part has poor rigidity, the lower part of the part bears a large force due to the gravity of the part, length and roundness direction deformation occurs, and during quenching and cooling, the part is not fixed, the part is prone to moving in the quenching medium, which causes heat treatment deformation to be aggravated, when an open hearth furnace is used for heat treatment, the traditional direct welding of a reinforcing bar is generally used, a V-shaped reinforcing bar is used, one end of the reinforcing bar is welded on the part, and the other end of the reinforcing bar is hung on the heat treatment furnace cover, the length direction of the part is in a free state, the gravity is downward, and length direction deformation can be reduced, but the part is unevenly stressed when being hung, and the reinforcing bar has a closing tendency when being hung, which causes the roundness direction of the part to be closed at the position of the welded reinforcing bar, and the roundness requirement cannot be met, the two traditional clamping modes cannot meet the use requirement of the part, and therefore a special tool clamp needs to be designed to control heat treatment deformation. Content of the utility model

[0011] In order to overcome the defects of the prior art, the utility model provides a kind of slender thin-walled cylinder part heat treatment hoisting clamp, the hoisting clamp can solve the clamping problem of slender thin-walled cylinder part in heat treatment process, effectively control and reduce the deformation of part, meet the use requirement of part, ensure the quality of part, and reduce the operation difficulty.

[0012] The utility model solves the technical scheme that it adopts: a kind of slender thin-walled cylinder part heat treatment hoisting clamp, including disc, reinforcing bar, ring and auxiliary fixing rib, the top of the disc is interval and is provided with a ring, the lower half of ring is fixedly connected with one end of three reinforcing bars, reinforcing bar is evenly arranged in the circumferential direction of ring, the other end of three reinforcing bars is fixedly connected with the top of disc, and reinforcing bar is arranged in inclined direction;Auxiliary fixing rib is eight, after part and disc bottom surface are pasted, auxiliary fixing rib is arranged in vertical direction and is evenly distributed in the circumferential direction of part and disc pasting position, and is welded with part and disc.

[0013] Further, the outer diameter of the disc is the same as the outer diameter of the part.

[0014] Further, the lower part of the ring is on the same axis as the disc, and the disc is horizontally arranged.

[0015] Further, the ring is located at the center of the entire device.

[0016] Further, the reinforcing bar and the ring are both made of steel.

[0017] The utility model discloses beneficial effect is: the utility model discloses the freedom of length direction is guaranteed while the part roundness direction is fixed, rely on gravity to reduce the deformation of length direction, satisfy the product part requirement, improve product quality, manufacturing difficulty is small, operability is strong, this kind of hoisting fixture structure can also be used for other size's thin-walled cylinder class spare, has been successfully applied in multiple products. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model is further illustrated below in combination with the drawings and specific embodiment.

[0019] Figure 1 It is the structural schematic diagram of the utility model.

[0020] Figure 2 It is Figure 1 The plan view of 5.

[0021] Mark in drawing:

[0022] 1, disc, 2, tie bar, 3, lifting ring, 4, auxiliary fixing rib, 5, spare. SPECIFIC EMBODIMENT

[0023] As Figure 1 -2 shows, a kind of elongated thin-walled cylinder class spare heat treatment hoisting fixture, including disc 1, tie bar 2, lifting ring 3 and auxiliary fixing rib 4, the top of the disc 1 is spaced apart and is provided with a lifting ring 3, the lower part of lifting ring 3 is with the same axis of disc 1, disc 1 is horizontally arranged;Lifting ring 3 lower half is fixedly connected with one end of three tie bars 2, tie bar 2 is evenly arranged in the circumferential direction of lifting ring 3, the other end of three tie bars 2 is fixedly connected with the top of disc 1, tie bar 2 is arranged in inclined direction;Auxiliary fixing rib 4 is eight, the outer circle diameter of disc 1 is same with the outer circle of spare 5, after the adhesion of spare 5 and the bottom surface of disc 1, auxiliary fixing rib 4 is arranged in vertical direction and is evenly distributed in the circumferential direction of the adhesion position of spare 5 and disc 1, and is welded and fixed with spare 5 and disc 1;Lifting ring 3 is located at the center position of the whole device, and tie bar 2 and lifting ring 3 are all steel bar materials.

[0024] The elongated thin-walled cylinder class spare heat treatment hoisting fixture adopts shaft type furnace heat treatment, a lifting ring structure is designed on the upper portion, which facilitates the structure and the clamping of the spare 5 to be hung on the equipment after being clamped;The hoisting fixture is designed based on the design principles of meeting the clamping requirements of the spare 5, controlling the deformation of the spare 5 and ensuring the quality of the spare 5, and is innovatively designed based on the research on various clamping devices, which discards the traditional binding and basket clamping method, adopts the combined structure of the lifting ring 3, the tie bar 2 and the disc 1, and designs the clamping and hanging of the spare 5 in the roundness direction, applies a fixing force in the diameter direction of one side of the spare 5, relies on gravity to reduce the length reverse deformation, and ensures the implementation of the quenching process.

[0025] In use, the outer circle of the part 5 is placed flush with the outer circle of the disc 1, and is welded and connected using auxiliary fixing ribs 4. The auxiliary fixing ribs are eight in number and are evenly distributed in the direction of the outer circle of the part 5, i.e. the disc 1. The part 5 is fixed with the lifting fixture at the same time that a fixing force is applied in the circumferential direction of the part 5. After heat treatment, the part 5 is cooled to room temperature, the welds on the auxiliary fixing ribs 4 are ground off, and the fixture can be removed.

[0026] The deformation control of such thin-walled elongated cylindrical parts during heat treatment is a production difficulty. Through the design and application of the heat treatment lifting fixture for the elongated thin-walled cylindrical part, heat treatment deformation can be effectively controlled, the correction difficulty can be reduced, and the product quality can be improved.

Claims

1. An elongated thin-walled cylindrical part heat treatment hoisting clamp characterized by: The device comprises a disc (1), a reinforcing bar (2), a lifting ring (3) and an auxiliary fixing bar (4), the top of the disc (1) is provided with a lifting ring (3) at intervals, the lower half of the lifting ring (3) is fixedly connected with one end of three reinforcing bars (2), the reinforcing bars (2) are evenly arranged in the circumferential direction of the lifting ring (3), the other end of the three reinforcing bars (2) is fixedly connected with the top of the disc (1), and the reinforcing bars (2) are arranged in an inclined direction; the auxiliary fixing bars (4) are eight in total, after the part (5) is attached to the bottom surface of the disc (1), the auxiliary fixing bars (4) are arranged in a vertical direction and evenly distributed in the circumferential direction of the attachment position of the part (5) and the disc (1), and are welded and fixed with the part (5) and the disc (1).

2. The heat treatment hanging clamp for an elongated thin-walled cylindrical part according to claim 1, characterized in that: The outer circle diameter of the disc (1) is the same as that of the part (5).

3. The heat treatment hanging clamp for an elongated thin-walled cylindrical part according to claim 1, characterized in that: The lower part of the lifting ring (3) is coaxial with the disc (1), and the disc (1) is horizontally arranged.

4. The heat treatment hanging clamp for an elongated thin-walled cylindrical part according to claim 1, characterized in that: The lifting ring (3) is located at the center position of the whole device.

5. The heat treatment hanging clamp for an elongated thin-walled cylindrical part according to claim 1, characterized in that: The reinforcing bars (2) and the lifting ring (3) are both made of steel.

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