Tray mesh for quenching bearing parts

Abstract

The utility model belongs to the technical field of bearing heat treatment, and provides a tray mesh for quenching bearing parts, which is made of a heat-resistant steel plate. The tray mesh is of a rectangular structure with four corners cut off; the tray mesh is provided with a longitudinal groove and a transverse groove; the longitudinal grooves and the transverse grooves are used for dividing the material tray mesh into four equal symmetrical structure areas; a plurality of slotted holes are formed in each area; the groove holes are all arranged in an inclined mode. A plurality of slotted hole structures are convenient for sufficient flowing of a quenching medium during quenching, so that a better cooling condition is provided for part quenching; all the slotted holes in each area are arranged in parallel; and the center line of the slotted hole on one diagonal line of the tray mesh is overlapped with the diagonal line. According to the utility model, air films are not formed at the contact part of the part and the mesh during quenching, soft spots are not generated, the quenching quality is not influenced, and the contact part of the part and the mesh after quenching is not damaged by cushion.

Description

Technical Field

[0001] This utility model belongs to the field of bearing heat treatment technology, specifically relating to a material tray mesh for quenching bearing parts. Background Technology

[0002] When bearing parts are loaded into the furnace for processing using a tray, a mesh sheet is often used to level the bottom of the tray. Currently, the mesh sheet is woven from heat-resistant steel wire, and after weaving, it is flattened with a press and laid flat at the bottom of the tray during use. After using this type of mesh sheet, some bearing parts developed pad marks after quenching. For parts with a slightly larger grinding allowance, the pad marks can be eliminated, but for parts with a small grinding allowance, the pad marks cannot be eliminated after grinding to the finished product, making them scrap. The pad marks are caused by the protrusions at the overlap of the mesh weave causing ridge marks on the parts in the red-hot state after quenching and heating. Utility Model Content

[0003] The purpose of this invention is to provide a slurry mesh for quenching bearing parts, which can ensure that a gas film does not form at the contact point between the part and the mesh during quenching, thus preventing soft spots that affect the quenching quality, and also ensure that no padding damage occurs at the contact point between the part and the mesh after quenching.

[0004] To achieve the above objectives, this utility model adopts the following technical solution:

[0005] A slurry tray for quenching bearing parts is made of heat-resistant steel plate. The slurry tray is a rectangular structure with its four corners cut off. It has longitudinal and transverse grooves that divide it into four equal symmetrical regions. Each region has several slots. These slots are all angled. The slot structure facilitates the full flow of the quenching medium during quenching, providing better cooling conditions for the parts. All slots in each region are arranged in parallel. The centerline of a slot located on one of the diagonals of the slurry tray coincides with the diagonal.

[0006] The thickness of the material tray mesh is 3mm, and the surface is free of burrs.

[0007] The slots in the two diagonal regions have the same orientation.

[0008] The spacing between each adjacent slot is equal, and the chamfer of the slot is R5.

[0009] This utility model proposes a slab mesh for quenching bearing parts. Using this slab mesh structure, when the bearing parts are loaded into the furnace processing slab, a heat-resistant steel plate is placed at the bottom of the slab. Because the steel plate surface is flat and without any overlapping protrusions, it avoids damage to the parts after heating. Multiple closely spaced slots facilitate sufficient cooling of the parts by the quenching medium during quenching. The direction and size of the slots prevent the formation of an air film within the quenching medium, ensuring that the parts have no soft spots after quenching. This guarantees that the product hardness meets technical requirements while avoiding damage and scrap. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] In the diagram: 1. Longitudinal groove, 2. Transverse groove, 3. Groove hole. Detailed Implementation

[0012] The present invention will be described in detail with reference to the accompanying drawings and specific embodiments;

[0013] A slurry tray for quenching bearing parts is made of heat-resistant steel plate. The slurry tray has a rectangular structure with its four corners cut off. It has longitudinal grooves 1 and transverse grooves 2, which divide the slurry tray into four equal and symmetrical structural regions. Each region has several slots 3, all of which are inclined. The slot structure facilitates the full flow of the quenching medium during quenching, providing better cooling conditions for the parts. All the slots in each region are arranged in parallel. The center line of the slot located on one of the diagonals of the slurry tray coincides with the diagonal.

[0014] The thickness of the material tray mesh is 3mm, and the surface is free of burrs;

[0015] The slots in the two diagonally opposite regions have the same orientation.

[0016] The spacing between each adjacent slot is equal, and the chamfer of the slot is R5.

[0017] A certain type of bearing has an outer diameter of 46.8 mm with an outer diameter allowance of 0.20 mm, a height of 83 mm with a height allowance of 0.25 mm, and undergoes heat treatment quenching.

[0018] During implementation, the improved mesh is placed at the bottom of the material tray, and then the rollers are placed on the mesh according to the process requirements before being heated and quenched in the furnace. This type of roller has a small allowance, and after quenching, the parts in contact with the mesh are inspected and found to be free of ridges. The quenching and tempering hardness is qualified and there are no soft spots.

[0019] A certain type of bearing has an outer diameter of 51.0 mm with an outer diameter allowance of 0.20 mm, a height of 102.86 mm with a height allowance of 0.34 mm, and undergoes heat treatment quenching.

[0020] During implementation, the improved mesh is placed at the bottom of the material tray, and then the rollers are placed on the mesh according to the process requirements before being heated and quenched in the furnace. This type of roller has a small allowance, and after quenching, inspection shows that there are no ridges at the contact points with the mesh, and the quenching and tempering hardness is qualified with no soft spots.

[0021] A certain type of bearing ring has an outer diameter of 1360 mm, an outer diameter allowance of 0.05 mm, a height of 411.6 mm, a height allowance of 3.4 mm, and an end face width of 71.2 mm. It is to be heat-treated by quenching.

[0022] During implementation, the improved mesh is placed at the bottom of the material tray, and then the ferrule is placed according to the process requirements.

[0023] The mesh is heated and quenched in a furnace. This type of collar is large in size and has a wide end face, resulting in a large contact area with the mesh. After quenching, inspection revealed no ridge damage on the end face of the collar in contact with the mesh. The end face was tested and found to have qualified hardness after quenching and tempering with no soft spots.

Claims

1. A wire mesh tray for quenching bearing parts, characterized in that: The feed tray is made of heat-resistant steel plate; the feed tray is a rectangular structure with its four corners cut off; the feed tray has longitudinal grooves and transverse grooves; the longitudinal and transverse grooves divide the feed tray into four equal symmetrical structural regions; each region has several slots; the slots are all inclined; the slot structure facilitates the full flow of the quenching medium during quenching, providing better cooling conditions for the parts; all the slots in each region are arranged in parallel; the center line of the slot located on one of the diagonals of the feed tray coincides with the diagonal.

2. The wire mesh for quenching bearing parts as described in claim 1, characterized in that: The thickness of the material tray mesh is 3mm, and the surface is free of burrs.

3. The wire mesh for quenching bearing parts as described in claim 1, characterized in that: The slots in the two diagonal regions have the same orientation.

4. The wire mesh for quenching bearing parts as described in claim 1, characterized in that: The spacing between each adjacent slot is equal, and the chamfer of the slot is R5.

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