Sintering jig

Abstract

The utility model relates to the technical field of powder metallurgy jigs, in particular to a sintering jig which aims at a to-be-sintered product with a groove body at the end portion, the to-be-sintered product is provided with a first end and a second end which are oppositely arranged in the vertical direction, the groove body is located at the first end, and the sintering jig comprises a sintering jig body. The sintering jig body is provided with at least one supporting piece used for supporting the product to be sintered. And a partial area of the top surface of the supporting piece is sunken downwards. In the application, the to-be-sintered product is still vertically placed, and the end part of the to-be-sintered product is provided with the groove body, so that the bottom wall of the groove body replaces the end surface of the end part of the to-be-sintered product to be in contact with the supporting piece, the end part of the to-be-sintered product is prevented from deforming or the deformation amount of the end part of the to-be-sintered product is reduced, and the rejection rate of the to-be-sintered product is reduced.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy fixture technology, specifically to a sintering fixture. Background Technology

[0002] In today's industrial sector, cemented carbide plays a crucial role in many industries due to its excellent wear resistance and corrosion resistance. Especially in harsh working conditions such as oil extraction, it provides strong support for improving equipment lifespan, reducing maintenance costs, and ensuring efficient and stable production.

[0003] Currently, powder metallurgy is a common method for preparing cemented carbide. During the sintering process of this technology, a liquid phase appears. While this phenomenon helps to densify the cemented carbide, it also brings a significant problem: the volume of the finished product shrinks. This volume change has a more pronounced impact on products with complex shapes, such as cemented carbide threaded nozzles.

[0004] Carbide threaded nozzles have a unique hollow, thin-walled structure, which makes them less stable during sintering. The area where the nozzle contacts the firing plate is particularly prone to deformation due to the combined effects of gravity and sintering shrinkage. This deformation not only affects the product's appearance but, more importantly, severely impacts its dimensional accuracy. Slightly deformed carbide threaded nozzles can have their dimensional accuracy maintained by increasing the grinding allowance, thus meeting usage requirements. However, severely deformed products currently have no choice but to be scrapped, which undoubtedly increases production costs, reduces production efficiency, and limits the large-scale application and promotion of carbide threaded nozzles.

[0005] Therefore, how to solve the problem of the easy deformation of the existing cemented carbide threaded nozzle during the sintering process has become the subject of this invention. Utility Model Content

[0006] The purpose of this invention is to provide a sintering fixture.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A sintering fixture is provided for a product to be sintered with a groove at one end. The product to be sintered has a first end and a second end arranged opposite to each other in the vertical direction. The groove is located at the first end. The sintering fixture includes a sintering fixture body, and at least one support member is provided on the sintering fixture body for supporting the product to be sintered.

[0009] A portion of the top surface of the support member is recessed downwards;

[0010] The sintering fixture is configured to have a supported state:

[0011] In the supported state, the top surface of the support member is in contact with the bottom wall of the tank at the first end of at least one of the products to be sintered, or the top surface of the support member is in contact with the end face of the second end of at least one of the products to be sintered.

[0012] In the above scheme, before sintering, the product to be sintered is supported by a support component, and then the sintering fixture is transferred to contact the sintering plate. The sintering fixture replaces the sintering plate in supporting the product to be sintered; specifically, the support component in the sintering fixture replaces the sintering plate in supporting the product to be sintered.

[0013] In the prior art, the sintering plate supports the product to be sintered, and the end face of the product to be sintered contacts the sintering plate. At this time, the product to be sintered is placed vertically. When the product to be sintered has the characteristics of being hollow and thin-walled, the end of the product to be sintered is prone to deformation, and the amount of deformation is generally large. When the deformation is severe, it can only be scrapped.

[0014] In this application, the product to be sintered is still placed vertically. Since the end of the product to be sintered is provided with a groove, the bottom wall of the groove replaces the end face of the end of the product to be sintered in contact with the support, thereby avoiding deformation of the end of the product to be sintered or reducing the amount of deformation of the end of the product to be sintered, and reducing the scrap rate of the product to be sintered.

[0015] In a further technical solution, under supported conditions, at least one of the top surfaces of the support member and the top surfaces of the sintered fixture is parallel to a horizontal plane.

[0016] The top surface of the support is parallel to the horizontal plane to prevent the support from being tilted and thus prevent the product to be sintered from moving after placement.

[0017] The top surface of the sintering fixture is parallel to the horizontal plane to prevent the sintering fixture from being tilted and thus prevent the support from moving after placement.

[0018] A further technical solution is that at least a portion of the edge region of the top surface of the support member is chamfered.

[0019] The area for setting the chamfered radius is the chamfered radius area. There are several settings for the chamfered radius area, and the figure shows one of them.

[0020] In a further technical solution, at least a portion of the cross-section of the support member is cross-shaped.

[0021] A portion of the top surface of the support member is recessed downwards. This recess can form a groove or a perforation. Taking a groove as an example, the upper cross-section of the support member is cross-shaped.

[0022] The cross-shaped design facilitates contact between the bottom wall of the aforementioned tank and the end face of the product to be sintered, which is in contact with the support.

[0023] In a further technical solution, the support member includes multiple interconnected cross-shaped structures.

[0024] This feature allows a single support to support multiple products to be sintered simultaneously, improving the practicality and applicability of the support.

[0025] In a further technical solution, the support member and the sintering fixture are integrally formed.

[0026] This section's design improves the structural strength of the sintering fixture and prevents the support components from easily moving relative to the sintering fixture.

[0027] In a further technical solution, the sintering fixture is provided with a fixing groove for fixing the support member.

[0028] The fixed groove enables a detachable connection between the sintering fixture and the support, thereby allowing for quick installation and disassembly of the support. This facilitates adjustment of the support according to actual conditions, such as selecting different support components based on specific circumstances.

[0029] In a further technical solution, the sintering fixture is configured as a high-purity graphite sintering fixture.

[0030] High-purity graphite has a high melting point and can withstand the high temperatures during sintering without melting or deforming, providing a stable supporting environment for the products to be sintered.

[0031] In a further technical solution, the sintering fixture is configured as a square structure.

[0032] The square structure allows the sintered fixture to support a large number of support components within a limited space.

[0033] In a further technical solution, the support members are configured as multiple, and each support member is arranged in a straight line or distributed in a square array.

[0034] Multiple support components are provided. Here, we use a single support component to support a single product to be sintered. Multiple corresponding products to be sintered can be transferred simultaneously by transferring the sintering fixture.

[0035] The linear or square array arrangement facilitates the placement of products to be sintered, enabling the orderly arrangement of these products.

[0036] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0037] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0038] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0039] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0040] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0041] The working principle and advantages of this utility model are as follows: Before sintering, the product to be sintered is supported by a support member, and then the sintering fixture is transferred to contact the sintering plate. The sintering fixture replaces the sintering plate in supporting the product to be sintered; specifically, the support member in the sintering fixture replaces the sintering plate in supporting the product to be sintered. In the prior art, the sintering plate supports the product to be sintered, and the end face of the product to be sintered contacts the sintering plate. At this time, the product to be sintered is placed vertically. When the product to be sintered has hollow and thin-walled characteristics, the end of the product to be sintered is prone to deformation, and the amount of deformation is generally large. Severe deformation necessitates scrapping. In this application, the product to be sintered is still placed vertically. Generally, since the end of the product to be sintered has a groove, the bottom wall of the groove replaces the end face of the product to contact the support member, avoiding deformation of the end of the product to be sintered or reducing the amount of deformation, thus reducing the scrap rate of the product to be sintered. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the sintering fixture according to an embodiment of the present invention;

[0043] Figure 2 This is a side view of the sintering fixture according to an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the sintering fixture and support component according to an embodiment of the present invention;

[0045] Figure 4 for Figure 3 Top view;

[0046] Figure 5 for Figure 4 Side view;

[0047] Figure 6 This is a schematic diagram of the structure of a cemented carbide threaded nozzle in the prior art;

[0048] Figure 7 for Figure 6 The main view;

[0049] Figure 8 for Figure 7 A sectional view;

[0050] Figure 9 for Figure 7 A bottom view;

[0051] Figure 10 This is one of the comparison diagrams between the present invention and the prior art;

[0052] Figure 11 The second figure shows the comparison results between this utility model and the prior art.

[0053] In the attached diagrams: 1. Product to be sintered; 11. Tank; 12. Large circle; 13. Small circle; 2. Sintering fixture; 3. Support; 4. Radius area; 5. Avoidance area. Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0055] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0056] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0057] See Figures 1-11 A sintering fixture is provided for a product 1 to be sintered with a groove 11 at one end. The product 1 to be sintered has a first end and a second end arranged opposite to each other in the vertical direction. The groove 11 is located at the first end. The sintering fixture includes a sintering fixture body 2. At least one support member 3 is provided on the sintering fixture body 2. The support member 3 is a component that replaces the sintering fixture body 2 to directly support the product 1 to be sintered.

[0058] A portion of the top surface of the support member 3 is recessed downwards;

[0059] The sintering fixture is configured to have a supported state:

[0060] In the supported state, the top surface of the support member 3 is in contact with the bottom wall of the groove 11 at the first end of at least one of the products to be sintered 1, or the top surface of the support member 3 is in contact with the end face of the second end of at least one of the products to be sintered 1.

[0061] The first end refers to the large circle 12 below, and the second end refers to the small circle 13 below.

[0062] In the following description, the product to be sintered 1 is illustrated using a cemented carbide threaded nozzle as an example, and is described with the large circle 12 facing downwards.

[0063] Before sintering, the product 1 to be sintered is supported by the support member 3, and then the sintering fixture 2 is transferred to contact the sintering plate. The sintering fixture replaces the sintering plate in supporting the product 1 to be sintered; specifically, the support member 3 in the sintering fixture replaces the sintering plate in supporting the product 1 to be sintered.

[0064] In the prior art, the sintering plate supports the product 1 to be sintered, and the end face of the product 1 to be sintered contacts the sintering plate. At this time, the product 1 to be sintered is placed vertically. When the product 1 to be sintered has the characteristics of being hollow and thin-walled, the end of the product 1 to be sintered is prone to deformation, and the amount of deformation is generally large. When the deformation is severe, it can only be scrapped.

[0065] In this application, the product to be sintered 1 is still placed vertically. Since the end of the product to be sintered 1 is provided with a groove 11, the bottom wall of the groove 11 replaces the end face of the end of the product to be sintered 1 and contacts the support 3, so as to avoid deformation of the end of the product to be sintered 1 or reduce the amount of deformation of the end of the product to be sintered 1 and reduce the scrap rate of the product to be sintered 1.

[0066] With the setup of this application, the product to be sintered 1 does not need to be in direct contact with the sintering plate during the sintering process, and has good compatibility, making it applicable to products to be sintered 1 of different sizes.

[0067] It should be noted that the key to achieving the contact between the end face of the bottom wall of the above-mentioned tank 11, which replaces the end face of the product 1 to be sintered, and the support member 3, is that a portion of the top surface of the support member is recessed downwards. This recessed setting can form a groove or a perforation, which is not limited here.

[0068] It should also be noted that, under normal circumstances, the large circle 12 is placed downwards. Since a portion of the top surface of the support member 3 is recessed downwards, the above effect can also be achieved when the small circle 13 is placed downwards. This application focuses on the case where the large circle 12 is placed downwards.

[0069] The area formed by the aforementioned depression serves as the avoidance area 5 to avoid the end of the product 1 to be sintered, and the end face of the end of the product 1 to be sintered is located within the avoidance area 5.

[0070] In some embodiments, the depth of the avoidance area 5 is 5-7 mm, and the width of the avoidance area 5 is 7-10 mm.

[0071] It should be emphasized that the support 3 can support one or more products 1 to be sintered according to the actual situation. The support 3 can also be set as one or more according to the actual situation. Based on this, the setting of the sintering fixture 2 provides convenience for diverse situations.

[0072] In some embodiments, the thickness of the sintered fixture 2 is 8-10 mm, the width of the sintered fixture 2 is 15-20 mm, and the length of the sintered fixture 2 is 60-370 mm.

[0073] See Figure 5 In this embodiment, in the supported state, at least one of the top surfaces of the support member 3 and the top surfaces of the sintered fixture 2 is parallel to the horizontal plane.

[0074] In some embodiments, the top surface of the support 3 is parallel to the horizontal plane to prevent the support 3 from being tilted and thus prevent the product 1 to be sintered from moving after placement.

[0075] In some embodiments, the top surface of the sintering fixture 2 is parallel to the horizontal plane to prevent the sintering fixture 2 from being tilted and thus prevent the support 3 from moving after placement.

[0076] See Figure 2 , Figure 4 In this embodiment, at least a portion of the edge region of the top surface of the support member 3 is provided with a chamfered radius.

[0077] The area for setting the chamfered R-angle is set to R-angle area 4. R-angle area 4 has multiple settings, and the figure shows one of them.

[0078] In some embodiments, the radius of the R-corner region 4 is 0.2~0.8mm.

[0079] The surface of the tank 11 at the end of the product to be sintered may be chamfered, such as the area between the bottom wall and the side wall of the tank 11. If the edge area of ​​the top surface of the support 3 is not chamfered, this edge area may engage with the surface of the tank 11, which may easily lead to deformation of more areas of the surface of the tank 11 and an increase in the amount of deformation.

[0080] See Figure 3 , Figure 4 In this embodiment, at least a portion of the cross-section of the support member 3 is cross-shaped.

[0081] A portion of the top surface of the support member 3 is recessed downwards. This recess can form a groove or a perforation. Taking a groove as an example, the upper cross-section of the support member 3 is cross-shaped.

[0082] The cross-shaped arrangement facilitates contact between the bottom wall of the aforementioned trough 11 and the end face of the product to be sintered 1, which is in contact with the support 3.

[0083] It should be noted that the cross-section of the aforementioned trough 11 is generally cross-shaped.

[0084] All areas at the edge of the cross-shaped structure can be set as the aforementioned R-angle area 4.

[0085] Optionally, the cross-section of the support member 3 is cross-shaped; the support member 3 can be set as a cross-shaped support rib; the width of the four ends of the support member 3 is 2~5mm.

[0086] See Figure 3 , Figure 4 In this embodiment, the support member 3 includes multiple connected cross-shaped structures.

[0087] The configuration of this embodiment allows a single support 3 to support multiple products 1 to be sintered simultaneously, thereby improving the practicality and applicability of the support 3.

[0088] In some embodiments, multiple support members 3 are provided, and each support member 3 has only a single cross-shaped structure. The support members 3 are either fitted together or integrated.

[0089] See Figure 2 In this embodiment, the support member 3 and the sintering fixture 2 are integrally formed.

[0090] The configuration of this embodiment can improve the structural strength of the sintering fixture and prevent the support 3 from easily moving relative to the sintering fixture 2.

[0091] In some embodiments, the two are not integrated.

[0092] In this embodiment, the sintering fixture 2 is provided with a fixing groove (not shown in the figure) for fixing the support member 3.

[0093] Optionally, the longitudinal section of the fixing groove is inverted T-shaped, and the bottom shape of the support 3 is adapted to the shape of the fixing groove.

[0094] The fixed groove enables a detachable connection between the sintering fixture 2 and the support 3, thereby enabling quick installation and quick disassembly of the support 3. It also facilitates adjustment of the support 3 according to actual conditions, such as selecting different support 3 based on actual conditions.

[0095] In this embodiment, the sintering fixture 2 is configured as a high-purity graphite sintering fixture 2.

[0096] High-purity graphite has a high melting point and can withstand the high temperatures during the sintering process without melting or deforming, providing a stable supporting environment for the product to be sintered.

[0097] Optionally, the support component 3 is made of high-purity graphite.

[0098] See Figure 1 In this embodiment, the sintering fixture 2 is configured as a square structure.

[0099] The square structure allows the sintered fixture 2 to support a large number of support components 3 while occupying a limited space.

[0100] See Figure 1 In this embodiment, the support member 3 is configured as a plurality of members, and each support member 3 is arranged in a straight line or distributed in a square array.

[0101] Multiple support components 3 are provided. Here, we will use a single support component 3 to support a single product 1 to be sintered. Multiple corresponding products 1 to be sintered can be transferred simultaneously by transferring the sintering fixture 2.

[0102] The arrangement of linear or square arrays facilitates the placement of the product to be sintered 1, enabling the orderly placement of the product to be sintered 1.

[0103] In some embodiments, the distance between the same part (such as the shaft) of two adjacent support members 3 is 10~30mm.

[0104] See Figures 6-10 The comparison environment is as follows: the thickness of the sintered fixture 2 is 8mm, the width of the sintered fixture 2 is 16mm, and the length of the sintered fixture 2 is 70mm; four support members 3 are provided on the sintered fixture 2, and the distance between the same part of two adjacent support members 3 is 16.5mm; the width of the end of the support member 3 is 3mm; the radius of the R-corner area 4 is 0.5mm; the depth of the avoidance area 5 is 4mm, and the width of the avoidance area 5 is 8mm.

[0105] The comparison process is as follows: In this application, the sintering fixture is first plasma-sprayed with a zirconia coating, then the hard alloy threaded nozzle blank is placed on the support 3 with the small circle 13 of the threaded nozzle facing downwards, and finally the sintering fixture 2 is placed on the sintering plate for sintering; the comparison group uses the method of placing it directly on the sintering plate.

[0106] The comparison results and analysis are as follows: The deformation of the small circular part 13 of the cemented carbide threaded nozzle sintered by the sintering fixture of this application is significantly less than that of the small circular part 13 of the cemented carbide threaded nozzle sintered using the prior art. When using the prior art, the small circular part 13 is in direct contact with the sintering plate. During the sintering process, friction exists due to the direct contact between the small circular part 13 and the sintering plate. When the liquid phase shrinks, it is affected by the friction, resulting in uneven shrinkage of the small circular part 13, which leads to a large deformation of the small circular part 13. This application avoids direct contact between the small circular part 13 and the sintering plate, so the deformation of the cemented carbide threaded nozzle sintered is small.

[0107] See Figure 11 The comparison environment is as follows: the thickness of the sintered fixture 2 is 8mm, the width of the sintered fixture 2 is 16mm, and the length of the sintered fixture 2 is 70mm; four support members 3 are provided on the sintered fixture 2, and the distance between the same part of two adjacent support members 3 is 16.5mm; the width of the end of the support member 3 is 3mm; the radius of the R-corner area 4 is 0.5mm; the depth of the avoidance area 5 is 4mm, and the width of the avoidance area 5 is 8mm.

[0108] The comparison process is as follows: In this application, the sintering fixture is first plasma-sprayed with a zirconia coating, then the hard alloy threaded nozzle blank is placed on the support 3 with the large circle part 12 of the threaded nozzle facing down, and finally the sintering fixture 2 is placed on the sintering plate for sintering; the comparison group uses the method of placing it directly on the sintering plate.

[0109] The comparison results and analysis are as follows: The deformation of the large circle portion 12 of the cemented carbide threaded nozzle sintered by the sintering fixture of this application is significantly less than that of the cemented carbide threaded nozzle sintered using the prior art. In the prior art, the large circle portion 12 is in direct contact with the sintering plate. During the sintering process, friction exists due to the direct contact between the large circle portion 12 and the sintering plate. When the liquid phase shrinks during sintering, it is affected by the friction, resulting in uneven shrinkage of the large circle portion 12 and a large deformation of the large circle portion 12. This application avoids direct contact between the large circle portion 12 and the sintering plate, thus the deformation of the sintered cemented carbide threaded nozzle is small.

[0110] Regarding the aforementioned carbide threaded nozzle, it is hereby supplemented that, in the above, when the groove 11 is close to the large circle 12 and the large circle 12 is facing downwards, the end face of the large circle 12 does not contact the support member 3, but the groove 11 contacts the support member 3; when the small circle 13 is facing downwards, part of the end face of the small circle 13 contacts the support member 3.

[0111] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sintering fixture for a product (1) to be sintered having a groove (11) at one end, the product (1) having a first end and a second end arranged opposite each other in the vertical direction, the groove (11) being located at the first end, characterized in that: The sintering fixture includes a sintering fixture body (2), and the sintering fixture body (2) is provided with at least one support member (3) for supporting the product (1) to be sintered. A portion of the top surface of the support member (3) is recessed downwards; The sintering fixture is configured to have a supported state: In the supported state, the top surface of the support member (3) is in contact with the bottom wall of the groove (11) at the first end of at least one of the products to be sintered (1), or the top surface of the support member (3) is in contact with the end face of the second end of at least one of the products to be sintered (1).

2. The sintering fixture according to claim 1, characterized in that: In the supported state, at least one of the top surface of the support member (3) and the top surface of the sintered fixture (2) is parallel to the horizontal plane.

3. A sintering fixture according to claim 1, characterized in that: At least a portion of the edge region of the top surface of the support member (3) is provided with a chamfered radius.

4. A sintering fixture according to claim 1, characterized in that: At least a portion of the cross-section of the support member (3) is cross-shaped.

5. A sintering fixture according to any one of claims 1-3, characterized in that: The support member (3) includes multiple interconnected cross-shaped structures.

6. A sintering fixture according to any one of claims 1-4, characterized in that: The support member (3) is integrally formed with the sintering fixture (2).

7. A sintering fixture according to any one of claims 1-4, characterized in that: The sintering fixture (2) is provided with a fixing groove for fixing the support member (3).

8. A sintering fixture according to any one of claims 1-4, characterized in that: The sintering fixture (2) is set as a high-purity graphite sintering fixture (2).

9. A sintering fixture according to any one of claims 1-4, characterized in that: The sintering fixture (2) is configured as a square structure.

10. A sintering fixture according to any one of claims 1-4, characterized in that: The support member (3) is configured as a plurality of such members, and each of the support members (3) is arranged in a straight line or in a square array.

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