Sintering tool for high-cobalt hard alloy long pipe

Abstract

The utility model discloses a sintering tool for a high-cobalt hard alloy long pipe, which comprises a sintering graphite plate, a plurality of graphite ring seats are uniformly distributed on the sintering graphite plate, and a graphite core is vertically and coaxially arranged above each graphite ring seat. The graphite ring seat and the graphite core are detachably connected through a connecting hole in the center of the graphite ring seat and an inserting part at the bottom of the graphite core, the graphite core has taper, the diameter of the upper end face of a core body of the graphite core is larger than that of the lower end face of the core body, and the graphite core is used for sintering an alloy product; through the optimized and improved design of the product, the problem of large sintering deformation of the high-cobalt hard alloy product is effectively controlled, the tool structure is simplified, the tool is suitable for batch sintering production, the damage condition of the graphite core is reduced, repeated utilization can be realized, and the production cost is reduced. And therefore, the beneficial effects of shortening the production period, improving the production efficiency, improving the quality of sintered products and reducing the production cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cemented carbide processing, and specifically, to a sintering tooling for high-cobalt cemented carbide long tubes. Background Art

[0002] The sintering of alloy long tubes is mainly carried out through high-temperature treatment, enabling the bonding and densification between alloy powder particles, thereby forming alloy long tubes with a certain strength and density. During the sintering process, physical and chemical changes occur between alloy powder particles, and these changes jointly determine the final properties of the sintered body.

[0003] Patent application document 1: CN219310084U discloses a sintering tooling for cemented carbide long pipe fittings.

[0004] Patent application document 2: CN104827040B discloses a sintering method and sintering tooling for molded cemented carbide long pipe fittings.

[0005] The above two utility model patents both describe the sintering methods for ordinary cemented carbides, but do not involve the sintering tooling for special materials such as high-cobalt cemented carbides with large sintering deformation. Using the sintering tooling introduced in the above utility model patents to produce high-cobalt cemented carbides cannot effectively control the actual alloy deformation, and the structure of the above sintering tooling is still relatively complex and not suitable for batch sintering production. Summary of the Utility Model

[0006] In view of the above technical problems in the related art, the present utility model provides a sintering tooling for high-cobalt cemented carbide long tubes, which can overcome the above deficiencies of the prior art.

[0007] To achieve the above technical objectives, the technical solution of the present utility model is realized as follows:

[0008] A sintering tooling for high-cobalt cemented carbide long tubes;

[0009] The sintering tooling for high-cobalt cemented carbide long tubes includes a sintered graphite plate, on which a number of graphite ring seats are evenly distributed. Above each graphite ring seat, a graphite core is vertically coaxially arranged. The graphite ring seat and the graphite core are detachably connected through a connection hole at the center of the graphite ring seat and a plug-in portion at the bottom of the graphite core. The graphite core has a taper, and the diameter of the upper end face of its core body is larger than that of the lower end face of the core body. The graphite core is used for sintering alloy products.

[0010] Furthermore, a step is formed between the lower end face of the core body of the graphite core and the plug-in portion.

[0011] Furthermore, there is a certain gap space between the step and the lower end face of the core body.

[0012] Further, the step and the graphite ring seat are in a transition fit.

[0013] Further, a through hole of the alloy product inner hole is axially formed inside the alloy product. The step is a relief groove type step, and the relief groove type step is used to increase the clearance for coating accumulation, and this clearance is used to prevent deformation of the alloy product inner hole.

[0014] Further, the graphite core is a core with a larger upper part and a smaller lower part, and the diameter of the upper end face of the core body of the graphite core is larger than the diameter of the lower end face of the core body of the graphite core.

[0015] Further, the sintered graphite plate is a standard sintered graphite plate, and the size of the sintered graphite plate is adapted to the size of the graphite core and the graphite core for loading into the boat.

[0016] Further, the sizes of the insertion part at the bottom of the graphite core and the connection hole at the center of the graphite ring seat correspond to each other, and the diameter size of the graphite ring seat is larger than the outer diameter size of the green compact before sintering.

[0017] Further, the materials of the graphite core, the graphite ring seat and the sintered graphite plate are all high-purity graphite.

[0018] Further, the alloy product is a high-cobalt cemented carbide long tube, and the length of the high-cobalt cemented carbide long tube is greater than or equal to 150 mm and its cobalt content is greater than 15%.

[0019] The beneficial effects of the present utility model: Through the optimized and improved design of the products of the present utility model, the problem of large sintering deformation of high-cobalt cemented carbide products is effectively controlled, the tooling structure is simplified and suitable for batch sintering production, the damage of the graphite core is reduced and it can be reused, thereby achieving the beneficial effects of shortening the production cycle, improving production efficiency, enhancing the quality of sintered products and reducing production costs. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic diagram of loading into a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present utility model;

[0022] Figure 2 is a schematic diagram of the structure of a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present utility model;

[0023] Figure 3 is a schematic structural diagram of an alloy product of a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention;

[0024] Figure 4 is a schematic structural diagram of a graphite core of a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention;

[0025] Figure 5 is a schematic structural diagram of a graphite ring seat of a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention;

[0026] In the figure: 1, graphite core; 2, graphite ring seat; 3, sintered graphite plate; 4, alloy product; 5, step; 6, inner hole of alloy product; 7, ring wall of alloy product; 8, insertion part; 9, connection hole; 10, upper end face of core body; 11, lower end face of core body. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0028] It should be understood that in the description of the embodiments of the present invention, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "several" means two or more unless otherwise specifically defined.

[0029] Such as Figures 1-5As shown, a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention includes a sintered graphite plate 3, on which a plurality of graphite ring seats 2 are evenly distributed. Above each graphite ring seat 2, a graphite core 1 is vertically coaxially arranged. The graphite ring seat 2 and the graphite core 1 are detachably connected through a connection hole 9 at the center of the graphite ring seat 2 and a plug-in part 8 at the bottom of the graphite core 1. The graphite core 1 has a taper, and the diameter of the upper end face 10 of its core body is larger than the diameter of the lower end face 11 of the core body. The graphite core 1 is used for sintering alloy products 4.

[0030] For a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention, in a specific embodiment, a step 5 is formed between the lower end face 11 of the core body of the graphite core 1 and the plug-in part 8.

[0031] For a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention, in a specific embodiment, both the height dimension of the step 5 and the horizontal distance dimension of the step 5 from the outer diameter of the lower end face 11 of the core body are 1 mm.

[0032] For a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention, in a specific embodiment, the step 5 and the graphite ring seat 2 are in a transition fit.

[0033] For a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention, in a specific embodiment, a through hole of an alloy product inner hole 6 is axially formed inside the alloy product 4. The step 5 is a relief groove type step, and the relief groove type step is used to increase the clearance for coating accumulation, and this clearance is used to avoid deformation of the alloy product inner hole 6.

[0034] For a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention, in a specific embodiment, the difference between the diameter of the upper end face 10 of the core body of the graphite core 1 and the diameter of the lower end face 11 of the core body of the graphite core 1 is greater than or equal to 0.6 mm and less than or equal to 0.8 mm.

[0035] For a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention, in a specific embodiment, the sintered graphite plate 3 is a standard sintered graphite plate, and its size is 500*200*10 mm.

[0036] For a sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention, in a specific embodiment, the plug-in part 8 at the bottom of the graphite core 1 and the connection hole 9 at the center of the graphite ring seat 2 have corresponding dimensions, and the diameter dimension of the graphite ring seat 2 is larger than the outer diameter dimension of the green compact before sintering.

[0037] A sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention. In a specific embodiment, the materials of the graphite core 1, the graphite ring seat 2, and the sintering graphite plate 3 are all high-purity graphite.

[0038] A sintering tooling for a high-cobalt cemented carbide long tube according to an embodiment of the present invention. In a specific embodiment, the alloy product 4 is a high-cobalt cemented carbide long tube, and the length of the high-cobalt cemented carbide long tube is greater than or equal to 150 mm and its cobalt content is 15%.

[0039] To facilitate the understanding of the above technical solution of the present invention, the above technical solution of the present invention will be described in detail below in terms of specific principles and setting methods, etc.

[0040] When in specific use, for a sintering tooling for a high-cobalt cemented carbide long tube according to the present invention, its use object is as Figure 3 shown, for the sintering production of a high-cobalt cemented carbide long tube (cobalt content 20%), and its general length L≥150 mm.

[0041] A sintering tooling for a high-cobalt cemented carbide long tube according to the present invention generally includes a graphite core 1 with a taper and a step 5, a graphite ring seat 2, and a sintering graphite plate 3. The materials of the above three components are all high-purity graphite.

[0042] The specific design scheme of a sintering tooling for a high-cobalt cemented carbide long tube is as follows:

[0043] When sintering with a vertically arranged graphite core 1, the sintering deformation of the high-cobalt cemented carbide product 4 is relatively large. Using a vertical graphite core for sintering can prevent serious product deformation. Therefore, the graphite core 1 is provided with a taper. The specific taper requirement is as Figure 4 shown. The difference between the diameter of the upper end face 10 of the core body of the graphite core 1 and the diameter of the lower end face 11 of the core body of the graphite core 1 is greater than or equal to 0.6 mm and less than or equal to 0.8 mm.

[0044] Considering that the high-cobalt long tube alloy product 4 will have a downward deformation during vertical sintering, and the alloy product 4 after sintering is close to a vase-shaped alloy, the maximum difference ΔD of the outer diameter size of the alloy product 4 MAX = 5 mm; combined with the dimensional tolerance of the customer's product and Using a graphite core 1 with a larger upper part and a smaller lower part can reduce the downward deformation. Therefore, the taper of the graphite core 1 is controlled at 0.6 - 0.8 mm / m, and it is beneficial to the rapid removal of the graphite core 1 after sintering.

[0045] In addition, as Figure 4As shown, a step 5 is formed between the lower end surface 11 of the graphite core 1 and the plug-in portion 8. Since the coating may fall off and accumulate during the sintering process, it is easy to squeeze the inner hole of the product, causing the inner hole 6 of the alloy product to be too large and out of tolerance. Therefore, a step with a back-cut groove is designed to increase the space for coating accumulation to avoid serious deformation of the inner hole 6 of the alloy product.

[0046] The standard sintered graphite plate 3 is independent of the graphite core 1 and the graphite ring seat 2, which is convenient for determining the loading range. The standard sintered graphite plate 3 generally has a size of 500*200*10mm, and the graphite plate is a standard part and is uniformly batched for standby, which does not interfere with the sintering of other cemented carbide products.

[0047] The above embodiment is only a specific implementation of the technical solution of the utility model. The specific taper of the graphite core 1 can be selected according to the material deformation and customer tolerance. The taper of the graphite core 1 facilitates the separation of the product and the graphite core 1 and reduces the damage of the graphite core 1 so that it can be reused, thereby improving production efficiency and shortening the production cycle. The taper of the graphite core 1 can effectively reduce the deformation of the lower pier of the high-cobalt cemented carbide long tube. The step 5 is added to the lower part of the tapered graphite core 1 to facilitate the accumulation of coating.

[0048] To sum up, with the help of the above-mentioned technical scheme of the utility model, through the optimization and improvement design of the product of the utility model, the problem of large sintering deformation of high-cobalt cemented carbide products can be effectively controlled, the tooling structure can be simplified and suitable for batch sintering production, the damage of the graphite core is reduced and can be reused, thereby achieving the beneficial effects of shortening the production cycle, improving production efficiency, improving the quality of sintered products and reducing production costs.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 sintering tool for a high-cobalt cemented carbide long tube, characterized in that: The invention comprises a sintered graphite plate (3), wherein a plurality of graphite ring seats (2) are evenly distributed on the sintered graphite plate (3), a graphite core (1) is vertically and coaxially arranged above each of the graphite ring seats (2), the graphite ring seats (2) and the graphite core (1) are detachably connected via a connecting hole (9) in the center of the graphite ring seat (2) and a plug-in portion (8) at the bottom of the graphite core (1), the graphite core (1) has a taper, and the diameter of the upper end face (10) of the core body is larger than the diameter of the lower end face (11) of the core body, and the graphite core (1) is used for sintering an alloy product (4).

2. The sintering tool for a high-cobalt cemented carbide long tube according to claim 1, characterized in that: A step (5) is formed between the lower end surface (11) of the core body of the graphite core (1) and the plug-in portion (8).

3. The sintering tool for a high-cobalt cemented carbide long tube according to claim 2, characterized in that: There is a gap space between the step (5) and the lower end surface (11) of the core.

4. The sintering tool for a high-cobalt cemented carbide long tube according to claim 2, characterized in that: The step (5) and the graphite ring seat (2) are in transition fit.

5. The sintering tool for a high-cobalt cemented carbide long tube according to claim 2, characterized in that: A through hole of the alloy product inner hole (6) is formed axially inside the alloy product (4), and the step (5) is a cutter groove type step, which is used to increase the space for coating accumulation, and the space is used to avoid deformation of the alloy product inner hole (6).

6. The sintering tool for a high-cobalt cemented carbide long tube according to claim 1, characterized in that: The graphite core (1) is a core body that is larger at the top and smaller at the bottom, and the diameter of the upper end surface (10) of the graphite core (1) is larger than the diameter of the lower end surface (11) of the graphite core (1).

7. The sintering tool for a high-cobalt cemented carbide long tube according to claim 1, characterized in that: The size of the sintered graphite plate (3) is adapted to the size of the graphite core (1) and the size of the graphite core (1) is adapted to the size of the boat.

8. The sintering tool for a high-cobalt cemented carbide long tube according to claim 1, characterized in that: The plug-in portion (8) at the bottom of the graphite core (1) and the connecting hole (9) at the center of the graphite ring seat (2) have corresponding sizes, and the diameter of the graphite ring seat (2) is larger than the outer diameter of the compact before sintering.

9. The sintering tool for a high-cobalt cemented carbide long tube according to claim 1, characterized in that: The graphite core (1), the graphite ring seat (2) and the sintered graphite plate (3) are all made of high-purity graphite.

10. The sintering tool for a high-cobalt cemented carbide long tube according to claim 1, characterized in that: The alloy product (4) is a high-cobalt cemented carbide long tube, the length of the high-cobalt cemented carbide long tube is greater than or equal to 150 mm, and the cobalt content thereof is greater than 15%.

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