A wax removal device for cemented carbide-doped wax materials

Abstract

This utility model relates to a wax removal device for cemented carbide mixed with wax, belonging to the field of cemented carbide production technology. The wax removal device includes a disc and a protective cover. At least one baffle is provided at the bottom of the disc, the baffle being vertically arranged and forming a circle. No mixed wax is placed within the space enclosed by the baffle. Wax removal holes are evenly distributed on the baffle, the diameter of which is smaller than the minimum particle size of the mixed wax. The protective cover is not connected to the disc during wax removal, but is fixed to the disc by clamps during cooling after wax removal. The protective cover is equipped with a valve for introducing inert gas. This utility model can solve the problem of incomplete wax removal of mixed wax and avoid the oxidation and loss of high-temperature raw material particles after wax removal.

Description

Technical Field

[0001] This utility model relates to the field of cemented carbide production technology, specifically to a wax removal device for cemented carbide wax-doped materials. Background Technology

[0002] In the powder metallurgy manufacturing process of cemented carbide, the removal of wax from the wax-admixture is a crucial step. The wax-admixture is a mixture of metal raw material powder and paraffin wax particles. Typically, a square stainless steel tray is used to hold the wax-admixture, and the wax is removed at high temperature in a wax removal furnace. However, when the square stainless steel tray holds too much wax-admixture, the molten paraffin wax that accumulates at the bottom is difficult to remove, resulting in incomplete wax removal. Utility Model Content

[0003] To address the problem of incomplete wax removal from wax-admixed materials, this invention proposes a wax removal device for cemented carbide-admixed materials.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a wax removal device for hard alloy wax-doped material, comprising a disc body and a protective cover. The bottom surface of the disc body is provided with at least one baffle, which is vertically arranged and forms a circle. No wax-doped material is laid in the space enclosed by the baffle. Wax removal holes of the same size are evenly distributed on the baffle, and the diameter of the wax removal holes is smaller than the minimum particle size of the wax-doped material. The protective cover is not connected to the disc body during wax removal, but is fixedly connected to the disc body by a clamp during cooling after wax removal. The protective cover is provided with a valve for filling inert gas.

[0005] Preferably, the total area of ​​the region enclosed by the baffle accounts for 5% or more of the bottom area of ​​the disc. This proportion can ensure that the wax liquid can be discharged smoothly without affecting the stability of the material layer due to an excessively large opening.

[0006] Preferably, there are at least 5 baffles, each forming a circle, with a distance of at least 60 mm between each baffle. The baffles with multiple evenly distributed openings allow the wax to drain smoothly from all directions, avoiding the problem of wax accumulation at the bottom of ordinary discs.

[0007] Preferably, the baffle is cylindrical, which is convenient for processing.

[0008] Preferably, the upper edge height of the baffle is the same as the upper edge height of the disc body, which improves the space utilization rate of the wax-mixed material inside the disc body and prevents leakage into the internal space of the baffle due to the baffle being too low.

[0009] Preferably, the height of the disc is less than 60 mm to avoid difficulties in wax removal caused by excessive material accumulation.

[0010] Preferably, the disc body is circular, and the edges of the disc body and the protective cover are provided with flanges for use with clamps to fix the protective cover. The flanges greatly improve the connection reliability between the protective cover and the disc body, making it less likely for inert gas to leak from the edge of the protective cover.

[0011] Preferably, the mesh size of the wax discharge hole is at least 40 mesh, which can effectively block the passage of wax-admixed particles while ensuring the smooth discharge of molten wax.

[0012] Preferably, the valve is a nitrogen valve, located on the top of the protective cover, which facilitates quick connection to a gas source and enables gas replacement from top to bottom, effectively preventing oxidation of high-temperature raw materials.

[0013] This invention features multiple cylindrical baffles with wax discharge holes at the bottom of the disc, allowing the wax to be fully discharged during the high-temperature wax discharge process while maintaining a stable material layer. The protective cover, combined with a nitrogen valve, immediately creates a protective atmosphere after wax discharge, effectively preventing oxidation of the raw materials at high temperatures. The overall structure is simple and reliable, significantly improving wax discharge efficiency and ensuring product quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the disc body of this utility model; Figure 2 This is a top view of the disc body of this utility model; Figure 3 This is a cross-sectional view of the structure of this utility model.

[0015] Attached reference numerals: 1-panel, 2-protective cover, 101-baffle, 201-clamp, 202-valve. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] A wax removal device for cemented carbide-doped wax materials includes a disc body 1 and a protective cover 2. Figure 1 and Figure 2 As shown, the disc 1 is a shallow, circular disc with a flange edge, made of 304 stainless steel, with an inner diameter of 300 mm and a height of 50 mm. The bottom surface of the disc 1 has five cylindrical baffles 101, each baffle 101 hollow, forming a cylindrical space without a top cover, completely open to the outside. One baffle is located in the center, with the other four baffles evenly distributed at 90° angles around the central baffle. The distance between each baffle 101 is 70 mm, and the diameter is 30 mm. Wax discharge holes are evenly distributed on the surface of the baffles 101, arranged in a matrix array, with an opening rate of 30%-40%.

[0018] The height of the baffle 101 is the same as the edge height of the disc 1, both being 50 mm. For wax-admixed materials with smaller particle sizes, a metal wire mesh is also provided around the baffle 101. In this embodiment, the metal wire mesh is made of 40-mesh stainless steel wire mesh welded together, with uniformly distributed mesh openings to facilitate wax penetration. For wax-admixed materials with particle sizes larger than the mesh size of the baffle 101, the metal wire mesh may not be required. The outer diameter of the baffle 101 is 30 mm, and it is fixed to the wax outlet 101 by welding to ensure structural strength.

[0019] like Figure 3 As shown, the protective cover 2 is made of 304 stainless steel and has a flange edge. The protective cover 2 is fixed to the flange edge of the disc body 1 by clamping with clamp 201. The protective cover 2 protrudes upwards and has a valve 202 in the center. The valve 202 has a diameter of 5 mm and is connected to an external nitrogen source.

[0020] The above-mentioned wax removal device for cemented carbide wax-doped materials is used as follows.

[0021] S1. The granular wax-admixed material is evenly spread in the disc 1, and the internal space of the baffle 101 does not contain the wax-admixed material; S2. Place the plate 1 filled with wax-doped material on the graphite boat, and put it into the wax removal furnace along with the graphite boat. There is flowing argon gas in the wax removal furnace. Part of the argon gas flow passes through the gaps in the wax-doped material from top to bottom and flows out from the wax removal hole of the baffle 101. The wax removal furnace is heated to 600 degrees Celsius. The paraffin inside the wax-doped material is vaporized and flows with the argon gas flow. The paraffin gas generated by the wax-doped material at the bottom is discharged from the wax removal hole of the baffle 101 along with the argon gas flow. S3. After 2 hours of high-temperature dewaxing, the paraffin in the wax-mixed material is basically completely discharged, and raw material particles are obtained. The temperature of the dewaxing furnace is reduced to below 50 degrees Celsius. The plate 1 is taken out and the protective cover 2 is immediately covered and the clamp 201 is locked. Nitrogen gas is continuously introduced through the valve 202 on the protective cover 2. S4. Keep nitrogen continuously supplied and let the disc 1 stand in a constant temperature and humidity environment for about 48 hours. Then open the protective cover 2 and take out the raw material particles that have been dewaxed.

[0022] Through the above technical solution, this utility model realizes a simple and reliable wax removal device for hard alloy wax-doped materials, which significantly improves the wax removal efficiency and can effectively prevent the oxidation of high-temperature raw materials after wax removal.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wax removal device for a cemented carbide waxed mass, characterized in that The device includes a disc body (1) and a protective cover (2). The bottom surface of the disc body (1) is provided with at least one baffle (101). The baffle (101) is vertically arranged and forms a circle. No wax-admixed material is laid in the space enclosed by the baffle (101). Wax discharge holes of the same size are evenly distributed on the baffle (101). The diameter of the wax discharge holes is smaller than the minimum particle size of the wax-admixed material. The protective cover (2) is not connected to the disc body (1) when discharging wax. When cooling down after wax discharge, it is fixedly connected to the disc body (1) by a clamp (201). The protective cover (2) is provided with a valve (202) for filling inert gas.

2. A wax removal device for waxed cemented carbide material according to claim 1, characterized in that The total area of ​​the area enclosed by the baffle (101) accounts for 5% or more of the bottom area of ​​the disc (1).

3. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i s e d in that The number of baffles (101) is at least 5, each forming a circle, and the distance between each baffle (101) is at least 60 mm.

4. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i z e d in that The baffle (101) is cylindrical.

5. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i z e d in that The upper edge height of the baffle (101) is the same as the upper edge height of the disc (1).

6. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i z e d in that The height of the disc (1) is less than 60 mm.

7. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i z e d in that The disk (1) is circular.

8. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i z e d i n that The edges of the disc body (1) and the protective cover (2) are provided with flange edges.

9. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i z e d in that The mesh size of the wax removal holes should be at least 40 mesh.

10. A device for dewaxing a waxed cemented carbide compact according to claim 1, c h a r a c t e r i z e d i n that The valve (202) is a nitrogen valve and is located on the top of the protective cover (2).

Images