Pit furnace heat treatment tool for solid flanged shaft forgings

Abstract

The utility model relates to a hoisting tool for a heat treatment process, and discloses a pit furnace heat treatment tool for solid flanged shaft forgings, which comprises a tool cross beam, a hoop, a left hanging plate and a right hanging plate, the left hanging plate and the right hanging plate are symmetrical, and two extension parts are symmetrically arranged on the side wall of the hoop. The lower sections of the left hanging plate and the right hanging plate which are symmetrical are correspondingly connected with the extending parts on the two sides of the clamp respectively, and the upper sections of the left hanging plate and the right hanging plate are correspondingly connected with the two ends of the tool beam respectively. The lifting device is simple in structure, easy to disassemble and assemble, convenient to lift, capable of meeting the heat treatment lifting requirement and capable of effectively reducing workpiece deformation.

Description

Technical Field

[0001] This utility model relates to a heat treatment fixture, specifically a fixture for heat treatment of solid flanged shaft forgings in a pit furnace. Background Technology

[0002] Heat treatment is a fundamental technology in the machinery industry. It plays a vital role in fully realizing the performance potential of metallic materials, improving the intrinsic quality of products, and extending their service life. Heat treatment requires careful consideration not only of the heat treatment process design but also of the heat treatment tooling design.

[0003] For solid workpieces with flanged shafts (see...) Figure 4 For example, using ordinary overhead crane hooks is difficult to achieve lifting, and it is also inconvenient to place the load after it is loaded into the furnace, often requiring additional material to be reserved for lifting. To solve the above technical problems, CN201420087127.7 discloses a flange lifting hook used in the heat treatment process. The hook consists of three lifting chains a, b, and c arranged in a downwardly inclined sequence, with their rear ends connected to hooks a, b, and c respectively. The bottom ends of hooks a, b, and c are provided with left-curving lower hook feet, the tips of which point towards the axis of the wind turbine flange. The upper surface of the lower hook feet does not slip off from the bottom surface of the wind turbine flange, ensuring reliable operation. When hooks a, b, and c are in a relaxed state, they naturally disengage. If multiple hooks are used to lift the flange in the above technical solution, the operation is cumbersome due to the large number of hooks, and the inability to control the straightness of the vertical suspension of the forging in the furnace. Therefore, when used for solid flanged shaft forgings in this application, there are problems such as poor operability, poor adaptability, low production efficiency, and unstable lifting, which will lead to more serious deformation of the forging during subsequent heat treatment.

[0004] Therefore, there is a need for a tooling suitable for heat treatment of solid flanged shaft forgings in furnaces that can improve the quality control of the heat treatment process, reduce workpiece deformation, lower production costs, increase production efficiency, and reduce safety risks. Summary of the Invention

[0005] The purpose of this utility model is to solve the above-mentioned technical problems and provide a simple, easy-to-assemble and disassemble, easy-to-lift, heat treatment hoisting fixture for solid flanged shaft forgings in a pit furnace that meets the requirements of heat treatment hoisting and effectively reduces workpiece deformation.

[0006] The technical solution includes a tooling beam, as well as clamps and symmetrical left and right hanging plates. The side walls of the clamps are symmetrically provided with two extensions. The lower sections of the symmetrical left and right hanging plates are respectively connected to the extensions on both sides of the clamps, and the upper sections of the left and right hanging plates are respectively connected to both ends of the tooling beam.

[0007] The clamp consists of a detachable left clamp and a right clamp.

[0008] The two ends of the left and right halves of the clamp are connected by locking screws.

[0009] Both ends of the left and right halves of the clamp have symmetrical extension sections, and the extension sections have threaded holes for inserting locking screws. After being connected by locking screws, they form the extensions on both sides of the clamp.

[0010] The upper sections of the left and right hanging plates are respectively provided with crossbeam holes, and the two ends of the tooling crossbeam are respectively inserted into the crossbeam holes of the left and right hanging plates.

[0011] The lower sections of the left and right hanging plates are respectively provided with clamp holes, and the extensions on both sides of the clamps are respectively inserted into the clamp holes of the left and right hanging plates.

[0012] The holes in the crossbeam are square.

[0013] The crossbeam has a lifting lug at its center.

[0014] This utility model designs a clamp for securing the large head of a workpiece (solid flanged shaft forging), achieving a stable clamping effect. Left and right hanging plates connect the clamp to the crossbeam, preventing the workpiece from swaying or bumping into surrounding components during hoisting and movement. The clamp consists of a detachable left and right half-clamp, secured with screws. This detachable design allows for flexible adaptation to hoisting workpieces of different sizes by selecting appropriately sized left and right half-clamps. Furthermore, crossbeam holes and clamp holes are provided on the left and right hanging plates, facilitating the insertion of crossbeam and clamp extensions. This enables quick connection and disassembly with common heat treatment hoisting tooling crossbeams, making it very simple and easy to operate. This utility model features a simple structure, good flexibility and adaptability, easy assembly and disassembly, convenient hoisting, meets the requirements of heat treatment hoisting, and effectively reduces workpiece deformation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a top view of the left and right halves of the clamp.

[0017] Figure 3 This is a structural diagram of the left hanging plate.

[0018] Figure 4 A schematic diagram of the workpiece structure.

[0019] Among them, the tooling beam 1, left hanging plate 2, right hanging plate 3, left half clamp 4, right half clamp 5, locking screw 6, extension section 7, threaded hole 7.1, extension part 8, lifting lug 9, workpiece 10, flange end 10.1, small end 10.2, beam hole 11, clamp hole 12. Detailed Implementation

[0020] The present invention will be further explained below with reference to the accompanying drawings:

[0021] See Figure 1 The tooling beam 1 has a lifting lug 9 at the top center, and also includes a clamp and symmetrical left and right hanging plates 2 and 3. The clamp is composed of a detachable left clamp 4 and a right clamp 5, both ends of which have symmetrical extension sections 7. The extension sections 7 have threaded holes 7.1 for inserting locking screws 6. After the left clamp 4 and the right clamp 5 are closed, the threaded holes 7.1 of the extension sections 7 also correspond one by one. After being connected by locking screws 6, the extension parts 8 on both sides of the clamp are formed.

[0022] See Figure 2 The left and right hanging plates have symmetrical structures. Taking the left hanging plate as an example, its upper section has a corresponding beam hole 11 and its lower section has a corresponding clamp hole 12. The two ends of the tooling beam 1 are inserted into the beam holes 11 of the left and right hanging plates. The extensions 7 and 8 on both sides of the clamp are inserted into the clamp holes 12 of the left and right hanging plates 2 and 3. Preferably, the beam hole 11 is square, which can adapt to the cross-sectional shape of the tooling beam 1 and play a limiting role.

[0023] All components of this utility model tooling can be easily disassembled and assembled, occupying little space and offering good flexibility and adaptability. It can complete lifting, hoisting, placement, and cooling operations during clamping, furnace loading, and quenching and cooling, thereby improving heat treatment efficiency and effectively controlling the cooling deformation of solid flanged shafts. It avoids manual preparation work before hoisting at high temperatures, reducing safety risks. In particular, solid flanged shaft forgings do not require additional hoisting material, which can greatly reduce production costs when mass-producing such forgings.

[0024] The following example, using a heat treatment process, illustrates the usage of this utility model's tooling:

[0025] 1) After closing the left half clamp 4 and the right half clamp 5, use the locking screw 6 to pass through the threaded holes 7.1 and 8.1 to fix them together.

[0026] 2) Using a crane, lift the workpiece 10 (solid flanged shaft forging) with the small end 10.2 facing down (flange end 10.1 on top) into the fixed clamp; then insert the extensions 7 and 8 on both sides of the clamp into the clamp holes 12 of the left hanging plate 2 and the right hanging plate 3 respectively; finally, insert the crossbeam holes 11 of the left hanging plate 2 and the right hanging plate 3 into the two ends of the tooling crossbeam 1 respectively to complete the clamping of the workpiece 10.

[0027] 3) Start the crane, the hook lifts the lifting lug 9 and slowly lifts the crossbeam 1, while lifting the workpiece 10 and moving it. After the workpiece 10 is loaded into the furnace, it is placed in a suitable position in the furnace. The crane stops moving, the furnace door is closed, and the crane is removed from the tooling crossbeam 1.

[0028] 4) During quenching, open the furnace door, use the overhead crane to lift the lifting lug 9 of the tooling beam 1, lift the workpiece 10 above the quenching medium, and slowly and vertically enter the quenching medium for a certain period of time before lifting the workpiece to complete the quenching and cooling process.

[0029] 5) After quenching and cooling, hoist the tooling beam 1 back to the furnace platform of the heat treatment furnace, place it in a suitable position, close the furnace door, and allow the crane to detach from the beam. Perform performance tempering heat treatment on the workpiece according to the heat treatment process.

[0030] 6) After the performance tempering heat treatment, open the furnace door, lift the tooling beam 1 and suspend it on the heat treatment support. The entire heat treatment process is now complete.

Claims

1. A fixture for heat treatment of solid flanged shaft forgings in a pit furnace, comprising a fixture beam, characterized in that, It also includes a clamp and symmetrical left and right hanging plates. The side wall of the clamp is symmetrically provided with two extensions. The lower sections of the symmetrical left and right hanging plates are respectively connected to the extensions on both sides of the clamp, and the upper sections of the left and right hanging plates are respectively connected to the two ends of the tooling beam.

2. The tooling for heat treatment of solid flanged shaft forgings in a pit furnace as described in claim 1, characterized in that, The clamp consists of a detachable left clamp and a right clamp.

3. The tooling for heat treatment of solid flanged shaft forgings in a pit furnace as described in claim 2, characterized in that, The two ends of the left and right halves of the clamp are connected by locking screws.

4. The tooling for heat treatment of solid flanged shaft forgings in a pit furnace as described in claim 3, characterized in that, Both ends of the left and right halves of the clamp have symmetrical extension sections, and the extension sections have threaded holes for inserting locking screws. After being connected by locking screws, they form the extensions on both sides of the clamp.

5. The tooling for heat treatment of solid flanged shaft forgings in a pit furnace as described in any one of claims 1-4, characterized in that, The upper sections of the left and right hanging plates are respectively provided with crossbeam holes, and the two ends of the tooling crossbeam are respectively inserted into the crossbeam holes of the left and right hanging plates.

6. The tooling for heat treatment of solid flanged shaft forgings in a pit furnace as described in claim 5, characterized in that, The lower sections of the left and right hanging plates are respectively provided with clamp holes, and the extensions on both sides of the clamps are respectively inserted into the clamp holes of the left and right hanging plates.

7. The tooling for heat treatment of solid flanged shaft forgings in a pit furnace as described in claim 5, characterized in that, The holes in the crossbeam are square.

8. The tooling for heat treatment of solid flanged shaft forgings in a pit furnace as described in claim 1, characterized in that, The crossbeam has a lifting lug at its center.

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