Graphite boat for sintering hard alloy product

Abstract

The utility model relates to the technical field of sintering, and discloses a graphite boat for sintering a hard alloy product, which comprises a frame, the bottom of the frame is provided with a slot, the inside of the frame is fixedly connected with a wave-shaped plate, and the shape characteristic of the wave-shaped plate is that the middle part is gradually reduced outwards. According to the graphite boat for sintering the hard alloy product, the structure of the wave-shaped plate is set to be in a W shape and is reduced outwards, so that a worker can place cylindrical hard alloy products of different sizes in the concave positions of the wave-shaped plate, the contact area between the round hard alloy products and the wave-shaped plate is reduced through the W-shaped concave surfaces, and the products are in a suspended state; the extrusion force borne by the product when the product vertically faces downwards is reduced, the bottom of the product is prevented from being extruded, collapsed and deformed in the sintering process, the circulation performance of heat in the frame is improved through the formed round holes and the through holes, and the uniform heating performance of the device when the product is sintered is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering, in particular to a graphite boat for sintering hard alloy products. Background Art

[0002] Sintering is the process of transforming powdered materials into dense bodies. It is a traditional process. People have long used this process to produce ceramics, powder metallurgy, refractory materials, ultra-high temperature materials, etc. Generally speaking, after the powder is formed, the dense body obtained by sintering is a polycrystalline material, and its microstructure is composed of crystals, glass and pores.

[0003] A Chinese patent discloses a graphite boat for sintering cemented carbide products (authorization announcement number CN201990716U). This patented technology can meet the vacuum sintering needs of cemented carbide cold stamping die products with a height-to-diameter ratio greater than 2.5. It is easy to load and use, and can make the cemented carbide cold stamping die product qualification rate reach 95% during the vacuum sintering process, thereby improving the quality of the product, effectively saving the subsequent processing costs caused by product deformation, and improving production efficiency.

[0004] With respect to the above-mentioned and existing related technologies, the inventors believe that the following defects often exist: when sintering cemented carbide products, the existing graphite boat for sintering will be squeezed by its own weight due to the pressure of the product when placed, causing collapse and deformation, and the contact surface between the product and the graphite boat is large when placed, which can easily cause uneven heating at the contact point between the product and the graphite boat, affecting the qualified rate of product sintering. Utility Model Content

[0005] The technical problem to be solved by the utility model is that: in the prior art, there is a defect that the contact surface between the graphite boat and the sintered product is large and heated unevenly. For this reason, a graphite boat for sintering cemented carbide products is proposed.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a graphite boat for sintering cemented carbide products, comprising a frame, a slot is provided at the bottom of the frame, a corrugated plate is fixedly connected to the inside of the frame, the shape feature of the corrugated plate is that the middle part gradually narrows outward, circular holes are provided on both sides of the frame, and a plurality of through holes are provided on the inclined surface of the corrugated plate.

[0007] Preferably, a plurality of ventilation grooves are provided in the bottom depression of the corrugated plate.

[0008] Preferably, two handles are fixedly connected to the front end of the frame.

[0009] Preferably, the top protrusion of the corrugated plate is provided with rounded corners.

[0010] Preferably, the structure of the slot is a W-shape with the middle portion gradually narrowing outwards and matching the bottom shape of the corrugated plate.

[0011] Preferably, the inclination of the inclined surface of the corrugated plate is less than 80° and greater than 40°.

[0012] Preferably, the surfaces of the frame and the corrugated plate are sprayed with zirconium oxide powder coating.

[0013] Technical effects and advantages of the utility model:

[0014] In the utility model, by setting the structure of the corrugated plate to be W-shaped and shrinking outward, the staff can place cylindrical hard alloy products of different sizes in the depression of the corrugated plate. The contact area between the circular hard alloy product and the corrugated plate is reduced through the concave surface of the W shape, so that the product is placed in a suspended state, reducing the extrusion force on the product when it is vertically downward, preventing the bottom of the product from being squeezed, collapsed and deformed during the sintering process, and increasing the heat flow inside the frame through the opened circular holes and through holes, thereby improving the uniform heating of the product during sintering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 2 This is a cross-sectional view of the internal structure of the utility model;

[0017] Figure 3 For this utility model Figure 2 A partial enlarged view of the middle A;

[0018] Figure 4 It is a schematic diagram of the planar structure of the utility model;

[0019] Figure 5 It is a cross-sectional view of the cross-sectional structure of the utility model.

[0020] Legend: 1. Frame; 2. Slot; 3. Corrugated plate; 4. Round hole; 5. Through hole; 6. Ventilation groove; 7. Handle; 8. Rounded corner. DETAILED DESCRIPTION

[0021] The present invention will now be further described in detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0022] Reference Figure 1 - Figure 5As shown, the utility model provides a technical solution: a graphite boat for sintering cemented carbide products, comprising a frame 1, a slot 2 is provided at the bottom of the frame 1, a corrugated plate 3 is fixedly connected inside the frame 1, the shape feature of the corrugated plate 3 is that the middle part gradually shrinks outward, circular holes 4 are provided on both sides of the frame 1, and a plurality of through holes 5 are provided on the inclined surface of the corrugated plate 3. By setting the structure of the corrugated plate 3 to shrink outward in a W shape, the staff can place cylindrical hard alloy products of different sizes in the depression of the corrugated plate 3, and reduce the contact area between the circular hard alloy product and the corrugated plate 3 through the W-shaped concave surface, so that the product is placed in a suspended state, reducing the extrusion force on the product when it is vertically downward, preventing the bottom of the product from being squeezed, collapsed and deformed during the sintering process, and increasing the circulation of heat inside the frame 1 through the circular holes 4 and the through holes 5, thereby improving the uniform heating of the device during product sintering.

[0023] Reference Figure 2 and Figure 3 As shown, in this embodiment: a plurality of ventilation grooves 6 are provided at the bottom depression of the corrugated plate 3. The ventilation grooves 6 provided at the bottom of the corrugated plate 3 can prevent the product from being suspended in the corrugated plate 3. The bottom of the depression of the corrugated plate 3 is closed, so that heat can flow to the above-mentioned closed part through the ventilation grooves 6, thereby improving the uniformity of heating at the bottom of the product during sintering, so that the product can be sintered more evenly.

[0024] Reference Figure 1 and Figure 4 As shown, in the present embodiment: two handles 7 are fixedly connected to the front end of the frame 1, and the two handles 7 are provided to facilitate the staff to hold the handles 7 to move the device. At the same time, through the single-sided design of the handles 7 and the opening of the slots 2, the staff can staggeredly stack the frames 1, which is convenient for the staff to stack the device, reduce the space occupied by the device when not in use, and facilitate the staff to store the device.

[0025] Reference Figure 2 and Figure 3 As shown, in this embodiment: a rounded corner 8 is provided at the top protrusion of the corrugated plate 3. The rounded corner 8 provided at the top of the corrugated plate 3 makes the top of the corrugated plate 3 round and smooth, preventing the staff from causing scratches by colliding the cemented carbide to be sintered with the top of the corrugated plate 3.

[0026] Reference Figure 4As shown, in this embodiment: the structure of the slot 2 is a W-shape with the middle portion gradually narrowing outward, and is consistent with the bottom shape of the corrugated plate 3. Through the special shape design of the slot 2, the frame 1 can be inserted into the recessed portion of the corrugated plate 3 when placed on the top of the corrugated plate 3, so that the stacked device is not easy to loosen, and through the W-shaped design, the contact area between the bottom of the frame 1 and the desktop is increased when the frame 1 is placed flat, thereby increasing the friction between the two, making the frame 1 not easy to be dragged and more stable when placed.

[0027] Reference Figure 2 and Figure 3 It is shown that in this embodiment: the inclination of the inclined surface of the corrugated plate 3 is less than 80° and greater than 40°. Through the specified angle inclined surface design of the corrugated plate 3, when a plate-shaped hard alloy product is placed on the single inclined surface of the corrugated plate 3, the product will not be displaced and collapsed due to the excessive inclination of the inclined surface angle, and the plate-shaped product can be easily placed and sintered.

[0028] Reference Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment: the surfaces of the frame 1 and the corrugated plate 3 are sprayed with zirconium oxide powder coating. By uniformly spraying the zirconium oxide powder coating on the surfaces of the frame 1 and the corrugated plate 3, the device has the properties of high temperature resistance and corrosion resistance, and the thermal conductivity of the corrugated plate 3 to the sintered cemented carbide is improved, and it is not easy to adhere to the sintered cemented carbide, which is convenient for users to separate the sintered cemented carbide product from the device.

[0029] Working principle: By setting the structure of the corrugated plate 3 to be W-shaped and shrinking outward, the staff can place cylindrical hard alloy products of different sizes in the concave part of the corrugated plate 3. The W-shaped concave surface reduces the contact area between the circular hard alloy product and the corrugated plate 3, so that the product is placed in a suspended state, reducing the extrusion force on the product when it is vertically downward, preventing the bottom of the product from being squeezed and collapsed during the sintering process, and increasing the heat circulation inside the frame 1 through the circular holes 4 and through holes 5, improving the uniform heating of the device during the sintering of the product. The ventilation groove 6 at the bottom of the corrugated plate 3 prevents the product from being suspended in the air. The bottom of the concave part of the corrugated plate 3 is closed, so that heat can flow to the above-mentioned closed part through the ventilation groove 6, thereby improving the uniformity of heating at the bottom of the product during sintering, so that the product can be sintered more evenly. The two handles 7 are provided to facilitate the staff to hold the handles 7 to move the device. At the same time, the single-sided design of the handle 7 and the opening of the slot 2 allow the staff to stagger the frame 1, which is convenient for the staff to stack the device and reduce the occupancy of the device when not in use. The space is convenient for the staff to store the device. The rounded corner 8 opened on the top of the corrugated plate 3 makes the top of the corrugated plate 3 round and smooth, preventing the staff from colliding the hard alloy to be sintered with the top of the corrugated plate 3 to cause scratches. The special shape design of the slot 2 allows the frame 1 to be inserted into the depression of the corrugated plate 3 when placed on the top of the corrugated plate 3, so that the stacked device is not easy to loosen. In addition, the W-shaped design increases the contact surface between the bottom of the frame 1 and the desktop when it is laid flat, thereby increasing the friction between them and making the frame 1 not easy to be dragged. , it is more stable when placed. Through the specified angle bevel design of the corrugated plate 3, when the single bevel of the corrugated plate 3 is used to place a plate-shaped hard alloy product, the product will not be displaced and collapsed due to the excessive inclination of the bevel angle, and it is easy to place and sinter the plate-shaped product. By uniformly spraying a zirconium oxide powder coating on the surface of the frame 1 and the corrugated plate 3, the device has the properties of high temperature resistance and corrosion resistance, improves the thermal conductivity of the corrugated plate 3 to the sintered hard alloy, and is not easy to adhere to the sintered hard alloy, so that the user can separate the sintered hard alloy product from the device.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A graphite boat for sintering cemented carbide products, comprising a frame (1), characterized in that: A slot (2) is provided at the bottom of the frame (1), a corrugated plate (3) is fixedly connected to the inside of the frame (1), the shape feature of the corrugated plate (3) being gradually narrowed from the middle toward the outside, circular holes (4) are provided on both sides of the frame (1), and a plurality of through holes (5) are provided on the inclined surface of the corrugated plate (3).

2. The graphite boat for sintering cemented carbide products according to claim 1, characterized in that: A plurality of ventilation grooves (6) are provided at the bottom depression of the corrugated plate (3).

3. The graphite boat for sintering cemented carbide products according to claim 1, characterized in that: Two handles (7) are fixedly connected to the front end of the frame (1).

4. The graphite boat for sintering cemented carbide products according to claim 1, characterized in that: A rounded corner (8) is provided at the top protrusion of the corrugated plate (3).

5. The graphite boat for sintering cemented carbide products according to claim 1, characterized in that: The structure of the slot (2) is a W-shape with the middle portion gradually narrowing outwards, and is consistent with the bottom shape of the corrugated plate (3).

6. The graphite boat for sintering cemented carbide products according to claim 1, characterized in that: The inclination of the inclined surface of the corrugated plate (3) is less than 80° and greater than 40°.

7. The graphite boat for sintering cemented carbide products according to claim 1, characterized in that: The surfaces of the frame (1) and the corrugated plate (3) are both sprayed with a zirconium oxide powder coating.

Images