Sintering boat and sintering boat kit for sintering hard alloy bar products

Abstract

The utility model discloses a sintering boat for sintering a hard alloy bar product, which comprises a pressing plate, and the lower surface of the pressing plate is provided with an arc-shaped groove used for covering the hard alloy bar product. The utility model further provides a sintering boat kit for sintering the hard alloy bar product. According to the sintering boat for sintering the hard alloy bar product and the sintering boat suite, the pressing plate with the arc-shaped groove formed in the lower surface is adopted to cover the upper surface of the hard alloy bar product, the arc-shaped groove can apply correction force pointing to the circle center to the upper surface of the hard alloy bar product, distortion of the product can be corrected during sintering, and the product quality is improved. And the sintering yield of products can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hard alloy technical field especially relates to a hard alloy product sintering boat. BACKGROUND

[0002] The hard alloy bar product belongs to high-end products in the field of hard alloy bar section, is difficult to make and has high added value. Figure 3 Figure 4 The hard alloy bar product has high straightness requirement. At present, it is placed in the sintering boat with V-shaped groove for sintering.

[0003] In the prior art, the sintering boat for sintering produces many defective products with distortion. This is because the hard alloy bar product has V-shaped angle and irregularity on the outer surface, cannot guarantee no deformation in the sintering process through its own gravity, the qualified rate of sintering products is low, and cannot meet the market demand. Therefore, it is urgent to design a specific sintering boat for the hard alloy bar product to solve the distortion and deformation problem and improve the yield of sintering products. INVENTION CONTENTS

[0004] The utility model solves the technical problems in the above background technology, provides a hard alloy bar product sintering boat and sintering boat set for sintering products, which are not easy to twist or deform, and have high yield of sintering products.

[0005] To solve the above technical problems, the technical scheme provided by the utility model is as follows:

[0006] A hard alloy bar product sintering boat, comprising a pressing plate, an arc-shaped groove is formed on the lower surface of the pressing plate and used for covering the hard alloy bar product. The sintering boat can be made of graphite.

[0007] In the hard alloy bar product sintering boat, preferably, the arc-shaped groove and the upper half of the hard alloy bar product have two symmetrical tangent points in the vertical direction. The tangent points can be understood as follows: from the cross section, they are two symmetrical tangent points, and from the whole, they are two symmetrical tangent lines composed of countless tangent points, that is, the arc-shaped inner wall of the arc-shaped groove and the arc-shaped outer wall of the upper half of the hard alloy bar product are always tangent at two points. In this way, the arc-shaped groove will generate a force acting on the hard alloy bar product, and the force points to the center of the hard alloy bar product, which can be used for correction in the sintering process of the hard alloy bar product, resist deformation in the sintering process, improve the straightness of the product, and improve the yield of the product.

[0008] ​In the sintering boat for sintering the hard alloy rod product, preferably, the arc-shaped groove is semi-elliptical, and the short axis of the semi-elliptical shape is parallel to the lower surface of the pressing plate. The semi-elliptical arc-shaped groove and the short axis parallel to the pressing plate can ensure that the arc-shaped inner wall of the arc-shaped groove and the arc-shaped outer wall of the upper half of the hard alloy rod product are always tangent at two points to provide the correction force. At the same time, the use range of the sintering boat can be expanded, and one sintering boat can be applicable to various types of hard alloy rod products.

[0009] In the sintering boat for sintering the hard alloy rod product, preferably, the relationship between the major axis 2a and the major axis 2b of the semi-elliptical shape is 3 / 4φ>a>b>1 / 2φ, and φ is the diameter of the hard alloy rod product. Through the above limitation, the opening width of the arc-shaped groove can be ensured to be greater than the width of the hard alloy rod product, and at the same time, the semi-elliptical arc-shaped groove can provide two correction forces pointing to the center of the circle to the upper surface of the hard alloy rod product. If b is equal to 1 / 2φ, at this time, the edge of the arc-shaped groove is in contact with the outer edge of the hard alloy on both sides, at this time, the arc-shaped groove cannot well sinter and correct the hard alloy product. When the sintering boat is applicable to a specific V-shaped groove (the V-shaped groove is one-third of a circle, that is, the rod product is divided into three parts, and the V-shaped groove is one part, and the opening of the V-shaped groove is downward), a is less than 3 / 4φ, which can not only ensure that the arc-shaped groove applies two correction forces pointing to the center of the circle to the upper surface of the hard alloy product, but also expand the use range of the sintering boat of this type to be applicable to more types of hard alloy rod products.

[0010] In summary, the length of the major axis a and the minor axis b of the semi-elliptical shape can be flexibly designed according to the size of the hard alloy rod product and the compatibility of the boat type, so that the rod and the designed elliptical arc surface have two contact lines, and the product is straightened through the mechanical action. For example, the 14# sintering boat designed by the utility model can be applicable to the hard alloy rod product with a diameter range of 12mm≤diameter≤16mm, the value of a of the sintering boat is 9.0mm, the value of b is 8.25mm, and the distance between adjacent arc-shaped grooves is 3.0mm. For example, the 10# sintering boat designed by the utility model can be applicable to the hard alloy rod product with a diameter range of 16mm≤diameter≤22mm, the value of a of the sintering boat is 12.0mm, the value of b is 11.25mm, and the distance between adjacent arc-shaped grooves is 5.0mm.

[0011] In the sintering boat for sintering the hard alloy rod product, preferably, the arc-shaped grooves are spaced, uniform and parallel. The sintering boat is provided with multiple arc-shaped grooves at intervals, which can simultaneously place multiple hard alloy rod products in each sintering boat, thereby improving the sintering efficiency of the hard alloy rod product.

[0012] Preferably, the two side edges of the pressing plate are provided with thickened portions. The two side edges of the pressing plate are provided with the thickened portions, so that the sintering boat is protected by the thickened portions during use, avoiding the pressing plate from colliding with the outer edge of the arc-shaped groove and affecting the use effect of the arc-shaped groove.

[0013] As a general technical concept, the application further provides a sintering boat kit for sintering hard alloy rod products, comprising a bottom plate and a sintering boat as described above. The bottom plate is a flat plate, the sintering boat is arranged on the bottom plate, and the opening direction of the arc-shaped groove is downward. The bottom plate can be used to support the hard alloy rod products and the sintering boat thereon, and the flat structure of the bottom plate ensures that the plurality of hard alloy rod products placed thereon are at the same bottom level, so that they can better fit the arc-shaped groove of the pressing plate, thereby improving the sintering quality of the hard alloy rod products.

[0014] Preferably, the hard alloy rod product is provided with a V-shaped groove (the V-shaped groove is one-third of a circle, that is, the rod product is divided into three fan-shaped parts, the V-shaped groove is one of the fan-shaped parts, and the opening of the V-shaped groove is downward), the hard alloy rod product is arranged on the bottom plate through the sharp corner of the V-shaped groove, and the arc-shaped groove cover is arranged on the side of the hard alloy rod product away from the V-shaped groove. The sintering boat kit of the application is particularly suitable for hard alloy rod products provided with a V-shaped groove. When sintering the hard alloy rod product, the sharp corner of the V-shaped groove is arranged on the bottom plate, the arc-shaped groove cover is arranged on the side of the hard alloy rod product away from the V-shaped groove, the arc-shaped groove sintering boat has two parts fitting the upper surface of the hard alloy rod product, and the arc-shaped groove sintering boat applies a correcting force to the hard alloy rod product. In combination with the force applied by the bottom plate to the sharp corner of the V-shaped groove, it is equivalent to applying four correcting forces to the rod product, which corrects the rod product during the sintering process, thereby reducing the defective rate of the sintered hard alloy rod product.

[0015] As a general technical concept, the application further provides a sintering boat kit for sintering hard alloy rod products, comprising a bottom plate and a plurality of sintering boats as described above. The bottom plate is a flat plate, the sintering boats are arranged on the bottom plate in a stacked manner, and the opening direction of the arc-shaped groove of all the sintering boats is downward. The above structure is equivalent to arranging multiple layers of sintering boats on the bottom plate, which can be used to sinter more hard alloy rod products at the same time. The bottom plate can be used to support the hard alloy rod products and the sintering boats thereon, and the upper surface of the bottom plate or the pressing plate is a flat plate structure, which can ensure that the plurality of hard alloy rod products placed thereon are at the same bottom level, so that they can better fit the arc-shaped groove of the pressing plate, thereby improving the sintering quality of the hard alloy rod products.

[0016] In the sintering boat set for sintering the hard alloy rod product, preferably, a V-shaped groove (the V-shaped groove is one-third of a circle, that is, the hard alloy rod product is divided into three sectors, the V-shaped groove is one sector, and the opening of the V-shaped groove is downward) is formed on the hard alloy rod product, the hard alloy rod product is arranged on the bottom plate or the upper surface of the pressing plate through the sharp corner of the V-shaped groove, and the arc-shaped groove cover is arranged on the side of the hard alloy rod product away from the V-shaped groove.The sintering boat set of the utility model is particularly suitable for the hard alloy rod product with the V-shaped groove.When the hard alloy rod product is sintered, the sharp corner of the V-shaped groove is arranged on the bottom plate, the arc-shaped groove cover is arranged on the side of the hard alloy rod product away from the V-shaped groove, the arc-shaped groove sintering boat has two parts adhering to the upper surface of the hard alloy rod product, the hard alloy rod product is applied with the correcting force, the force of the bottom plate acting on the sharp corner of the V-shaped groove is combined, four correcting forces are applied to the hard alloy rod product, the hard alloy rod product is corrected during the sintering process, and the defective product rate of the sintered hard alloy rod product is reduced.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The sintering boat and the sintering boat set for sintering the hard alloy rod product adopt the pressing plate cover with the arc-shaped groove formed on the lower surface and arranged on the upper surface of the hard alloy rod product, the arc-shaped groove can apply the correcting force to the upper surface of the hard alloy product and point to the center of the circle, the product can be corrected during sintering, the sintering yield of the product can be improved, the sintering boat set can apply the correcting force to the upper and lower surfaces of the hard alloy product and point to the center of the circle when the pressing plate cover is used in combination with the bottom plate, the uniform correcting force can be provided for the hard alloy product to resist the deformation during the sintering process, the distortion of the hard alloy rod product is reduced, the straightness of the product is improved, and the defective product rate of the hard alloy rod product is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating laboriously.

[0020] Figure 1 It is a structural schematic view of the sintering boat for sintering the hard alloy rod product of embodiment 1.

[0021] Figure 2 It is a structural schematic view of the sintering boat for sintering the hard alloy rod product of embodiment 1. Figure 1

[0022] Figure 3 ​Structure schematic view of a sintering boat set for sintering of the cemented carbide rod product of Example 1.

[0023] Figure 4 Structure schematic view of a sintering boat set group for sintering of the cemented carbide rod product of Example 3.

[0024] Legend

[0025] 1, pressing plate; 11, arc-shaped groove; 12, thickened part; 2, bottom plate; 3, cemented carbide rod product; 31, V-shaped groove. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the following will be combined with the drawings and the preferred embodiments of the specification to make a more comprehensive and detailed description of the present application, but the protection scope of the present application is not limited to the following specific embodiments.

[0027] It should be particularly noted that when an element is described as being "fixed to, fixedly connected to, connected to or communicated to" another element, it can be directly fixed, fixedly connected, connected or communicated to another element, or indirectly fixed, fixedly connected, connected or communicated to another element through other intermediate connecting elements.

[0028] Unless otherwise defined, all the professional terms used in the following are the same as those commonly understood by the skilled in the art. The professional terms used in this paper are only for the purpose of describing the specific embodiments and are not intended to limit the protection scope of the present application.

[0029] Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods.

[0030] Example 1:

[0031] As shown in Figure 1 and Figure 2 The sintering boat (which can be graphite material) for sintering of the cemented carbide rod product of the present embodiment comprises a pressing plate 1, and the lower surface of the pressing plate 1 is provided with arc-shaped grooves 11 for covering the cemented carbide rod product 3. The arc-shaped grooves 11 are spaced, uniform and parallel, and there are two tangent points between the arc-shaped grooves 11 and the upper half of the cemented carbide rod product 3, which are symmetrically distributed in the vertical direction.

[0032] In the present embodiment, more specifically, the arc-shaped grooves 11 are semi-elliptical, and the short axis of the semi-elliptical shape is parallel to the lower surface of the pressing plate 1. The relationship between the major axis 2a and the major axis 2b of the semi-elliptical shape is 3 / 4φ > a > b > 1 / 2φ, and φ is the diameter of the cemented carbide rod product 3.

[0033] The arc-shaped groove 11 of the semi-elliptical shape of the present embodiment can be particularly suitable for cemented carbide rod product 3 with a V-shaped groove 31, which is one-third of a circle, i.e. equivalent to the cemented carbide rod product 3 being divided into three equal sectors, and the V-shaped groove 31 is one of the sectors, and the opening of the V-shaped groove 31 is directed downward.

[0034] In the present embodiment, the lengths of the major axis a and the minor axis b of the semi-elliptical shape can be flexibly designed according to the size of the cemented carbide rod product 3 and the compatibility of the boat model, so that the cemented carbide rod product 3 has two contact lines with the designed elliptical arc surface, and the product is straightened through mechanical action. For example, the 14# sintering boat designed in the present embodiment can be suitable for cemented carbide rod product 3 with a diameter in the range of 12 < diameter ≤ 16 mm, the value of a of the sintering boat is 9.0 mm, the value of b is 8.25 mm, and the distance between adjacent arc-shaped grooves 11 is 3.0 mm. In other embodiments, a 10# sintering boat can also be designed, which can be suitable for cemented carbide rod product 3 with a diameter in the range of 16 < diameter ≤ 22 mm, the value of a of the sintering boat is 12.0 mm, the value of b is 11.25 mm, and the distance between adjacent arc-shaped grooves 11 is 5.0 mm.

[0035] In the present embodiment, the two side edges of the pressing plate 1 are provided with thickened portions 12 to protect the outer edges of the arc-shaped grooves 11.

[0036] Embodiment 2:

[0037] As shown in Figure 3 , the sintering boat kit for sintering cemented carbide rod product of the present embodiment includes a bottom plate 2 and a sintering boat in embodiment 1, the bottom plate 2 is a flat plate, and the sintering boat is arranged on the bottom plate 2, and the opening direction of the arc-shaped groove 11 is downward.

[0038] In the present embodiment, the V-shaped groove 31 is provided on the cemented carbide rod product 3, and the cemented carbide rod product 3 is arranged on the bottom plate 2 through the sharp corner of the V-shaped groove 31, and the arc-shaped groove 11 is arranged on the side of the cemented carbide rod product 3 away from the V-shaped groove 31.

[0039] In the present embodiment, when sintering the cemented carbide rod product 3, the sharp corner of the V-shaped groove 31 is arranged on the bottom plate 2, and the arc-shaped groove 11 is arranged on the side of the cemented carbide rod product 3 away from the V-shaped groove 31.

[0040] Embodiment 3:

[0041] As shown in Figure 4 , the sintering boat kit for sintering cemented carbide rod product of the present embodiment includes a bottom plate 2 and a plurality of sintering boats in embodiment 1 (three are shown in the present embodiment), the bottom plate 2 is a flat plate, and the sintering boats are stacked on the bottom plate 2, and the opening direction of the arc-shaped groove 11 of all the sintering boats is downward.

[0042] In the embodiment, the V-shaped groove 31 is arranged on the cemented carbide rod product 3, the cemented carbide rod product 3 is arranged on the bottom plate 2 or the upper surface of the pressing plate 1 through the sharp corner of the V-shaped groove 31, and the arc-shaped groove 11 is arranged on the side of the cemented carbide rod product 3 away from the V-shaped groove 31.

[0043] In the embodiment, when the cemented carbide rod product 3 is sintered, the sharp corner of the V-shaped groove 31 of the bottom layer of the cemented carbide rod product 3 is arranged on the bottom plate 2, the arc-shaped groove 11 is arranged on the side of the cemented carbide rod product 3 away from the V-shaped groove 31, the sharp corner of the V-shaped groove 31 of the second layer of the cemented carbide rod product 3 below is arranged on the upper surface of the first layer of the sintering boat below, and the arrangement is sequentially performed.

[0044] The sintering boat set in the above embodiment is used for sintering the cemented carbide rod product 3 in the above embodiment. Figure 3 、 4 Compared with the conventional sintering boat with the V-shaped groove, the same material and the same sintering curve are used to perform the boat experiment, and the situation is shown in Table 1.

[0045] Table 1: Sintering situation of different sintering boats

[0046]

[0047] As shown in the above table, the sintering boat and the sintering method of the sintering boat in the embodiment greatly improve the qualified rate of the sintered product, and the sintering boat in the embodiment has better effect.

[0048] The above description is only preferred embodiments of the utility model, and is not used to limit the utility model, and the utility model can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement and the like made in the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sintering boat for sintering of cemented carbide rod products, c h a r a c t e r i s e d i n that The pressing plate (1) has an arc-shaped slot (11) on its lower surface for covering the hard alloy bar product (3). The arc-shaped slot (11) has two tangent points with the upper half of the hard alloy bar product (3) in the vertical direction.

2. A sintering boat for sintering of cemented carbide rod products according to claim 1, c h a r a c t e r i s e d in that The arc-shaped slot (11) is semicircular, and the minor axis of the semicircle is parallel to the lower surface of the pressing plate (1).

3. A sintering boat for sintering of cemented carbide rod products according to claim 2, c h a r a c t e r i s e d in that The relationship between the major axis 2a and the minor axis 2b of the semicircle is 3 / 4φ>a>b>1 / 2φ, and φ is the diameter of the hard alloy bar product (3).

4. A sintering boat for sintering of cemented carbide rod products according to any one of claims 1 - 3, c h a ra cte ri zed i n that The arc-shaped slots (11) are spaced, uniform and parallel.

5. A sintering boat for sintering of cemented carbide rod products according to any one of claims 1 - 3, c h a ra cte ri zed i n that The two side edges of the pressing plate (1) are provided with thickened portions (12).

6. A sintering boat kit for sintering of cemented carbide rod products, c h a r a c t e r i s e d i n that The bottom plate (2) is a flat plate, and the sintering boat is arranged on the bottom plate (2), and the opening direction of the arc-shaped slot (11) is downward.

7. A sintering boat kit for sintering of cemented carbide rod products according to claim 6, characterized in that, The hard alloy bar product (3) is provided with a V-shaped slot (31), and the hard alloy bar product (3) is arranged on the bottom plate (2) through the sharp corner of the V-shaped slot (31), and the arc-shaped slot (11) is arranged on the side of the hard alloy bar product (3) away from the V-shaped slot (31).

8. A sintering boat kit for sintering of cemented carbide rod products, c h a r a c t e r i s e d i n that The bottom plate (2) is a flat plate, and the sintering boats are arranged on the bottom plate (2) after being stacked up and down, and the opening directions of the arc-shaped slots (11) of all the sintering boats are downward.

9. A sintering boat kit for sintering cemented carbide rod products according to claim 8, characterized in that The hard alloy bar product (3) is provided with a V-shaped slot (31), and the hard alloy bar product (3) is arranged on the bottom plate (2) or the upper surface of the pressing plate (1) through the sharp corner of the V-shaped slot (31), and the arc-shaped slot (11) is arranged on the side of the hard alloy bar product (3) away from the V-shaped slot (31).

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