Boat for sintering ultra-long and ultra-thin hard alloy cutter blank

Abstract

The utility model discloses a boat for sintering an ultra-long and ultra-thin hard alloy cutter blank. The boat comprises an upper pressing plate, a lower pressing plate, an adjusting screw, a fixing ring and a fixing key. A plurality of upper pressing blocks with right-triangle-shaped cross sections are arranged on the lower surface of the upper pressing plate, a check block and a plurality of lower pressing blocks with right-triangle-shaped cross sections are arranged on the upper surface of the lower pressing plate, and the boat for sintering the ultra-long and ultra-thin hard alloy cutter blanks is reasonable in design, simple in structure, capable of saving materials and good in performance; the ultra-long ultra-thin hard alloy cutter blank can bear uniform pressure, air circulation is facilitated, the carbon atmosphere of the upper surface and the carbon atmosphere of the lower surface of the cutter blank are consistent, sintering deformation of the ultra-long ultra-thin hard alloy cutter blank is reduced, and the ultra-long ultra-thin hard alloy cutter blank is easy to use and popularize.

Description

Technical Field

[0001] The utility model belongs to the technical field of manufacturing cemented carbide blade blanks and relates to a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks. Background Art

[0002] Powder metallurgy is an industrial technology that produces metal powder or uses metal powder (or a mixture of metal powder and non-metallic powder) as raw material, and then forms and sinters it to produce metal materials, composite materials, and various types of products. Powder metallurgy technology has been widely used in fields such as transportation, machinery, electronics, aerospace, weapons, biology, new energy, information, and the nuclear industry, becoming one of the most dynamic branches of new materials science. Powder metallurgy technology has a series of advantages, such as significant energy and material savings, excellent performance, high product precision, and good stability, making it very suitable for mass production. The powder metallurgy products industry encompasses iron and stone cutting tools, cemented carbide, magnetic materials, and powder metallurgy products.

[0003] The powder metallurgy process generally includes the following steps: (1) Powder production. The powder production process includes the steps of powder preparation and powder mixing. In order to improve the formability and plasticity of the powder, plasticizers such as engine oil, rubber or paraffin are usually added. (2) Pressing and molding. The powder is pressed into the desired shape under a pressure of 15-600 MPa. (3) Sintering. It is carried out in a high-temperature furnace or vacuum furnace with a protective atmosphere. Sintering is different from metal melting. During sintering, at least one element remains in a solid state. During the sintering process, the powder particles undergo a series of physical and chemical processes such as diffusion, recrystallization, welding, combination, and dissolution to become a metallurgical product with a certain porosity. (4) Post-processing. Under normal circumstances, the sintered parts can be used directly. However, for some parts that require high dimensional precision and high hardness and wear resistance, post-sintering processing is required. Post-processing includes precision pressing, rolling, extrusion, quenching, surface hardening, oil immersion, and infiltration. Sintering is a key process in the powder metallurgy process. The compact is sintered to obtain the required final physical and mechanical properties.

[0004] In the prior art, for ultra-long and ultra-thin carbide blade blanks, when placed on a graphite boat for high-temperature sintering, there is an inconsistency in the carbon atmosphere on the upper and lower surfaces of the blade blank. As a result, the resistance encountered by the blade blank in all directions during high-temperature shrinkage is inconsistent, which easily leads to deformation and a high scrap rate for the sintering of ultra-long and ultra-thin carbide blade blanks.

[0005] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the purpose of the present utility model is to provide a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks, which aims to solve the problem in the prior art that when ultra-long and ultra-thin cemented carbide blade blanks are placed on a graphite boat for high-temperature sintering, the carbon atmosphere on the upper and lower surfaces of the blade blanks are inconsistent, and the resistance in all directions of the blade blanks during high-temperature shrinkage is inconsistent, which leads to easy deformation and excessively high scrap rate of sintered ultra-long and ultra-thin cemented carbide blade blanks.

[0007] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0008] The boat for sintering an ultra-long and ultra-thin cemented carbide blade blank comprises an upper pressing plate, a lower pressing plate, an adjusting screw, a fixing ring and a fixing key.

[0009] A plurality of upper pressing blocks with a right-angled triangle cross section are provided on the lower surface of the upper pressing plate, a plurality of upper pressing teeth are provided on the inclined surface of the upper pressing blocks with a right-angled triangle cross section, and four through holes are provided at the four corners of the upper pressing plate.

[0010] A stopper and a plurality of lower pressing blocks with a right-angled triangle cross section are provided on the upper surface of the lower pressing plate, a plurality of lower pressing teeth are provided on the inclined surface of the lower pressing block with a right-angled triangle cross section, a placement notch is provided on the vertical right-angled surface of the stopper and the lower pressing block with a right-angled triangle cross section near the lower pressing plate, and four threaded holes and four rulers are provided at the four corners of the lower pressing plate.

[0011] The upper section of the adjusting screw is provided with a hand wheel, a rotating handle and a keyway through hole, and the lower section of the adjusting screw is provided with a thread.

[0012] The distance between the upper surface of the keyway through hole and the lower surface of the handwheel is greater than the sum of the thicknesses of the upper pressure plate and the fixing ring by 2-5 mm. The cross-sectional shapes of the fixing key and the keyway through hole are both square and consistent in size. The length of the fixing key is greater than the outer diameter of the adjusting screw, the inner diameter of the fixing ring is greater than the outer diameter of the adjusting screw, and the outer diameter of the adjusting screw is smaller than the inner diameter of the through hole.

[0013] The upper pressing plate, the lower pressing plate, the adjusting screw, the fixing ring and the fixing key of the boat for sintering the ultra-long and ultra-thin carbide blade blank are all made of graphite material.

[0014] The beneficial effects are as follows: The utility model provides a sintering boat for ultra-long and ultra-thin cemented carbide blade blanks, comprising an upper pressing plate, a lower pressing plate, an adjusting screw, a fixing ring, and a fixing key. The adjusting screw passes through a through hole of the upper pressing plate and the fixing ring, and is threadedly inserted into a threaded hole of the lower pressing plate to secure the upper and lower pressing plates together. The fixing key is inserted into a keyway through hole of the adjusting screw to secure the fixing ring between the fixing key and the upper pressing plate.

[0015] During operation, the utility model relates to a boat for sintering ultra-long and ultra-thin carbide blade blanks. The ultra-long and ultra-thin carbide blade blank is inserted between the upper and lower pressing plates and tilted onto the inclined surface of the lower pressing block of the lower pressing plate, with the downward long side of the blade blank being caught in the placement notch of the lower pressing plate. The hand wheel of the adjustment screw is turned so that the adjustment screw is screwed into the threaded hole of the lower pressing plate and lowered. Since the upper pressing plate is fixed between the hand wheel of the adjustment screw and the fixed ring, the upper pressing plate also lowers until the upper pressure teeth of the upper pressing block on the lower surface of the upper pressing plate press the blade blank. The height of the upper pressing plate is observed by using four scales provided at the four corners of the lower pressing plate and the hand wheel of the adjustment screw is turned so that the heights of the four corners of the upper pressing plate are consistent, which is beneficial for evenly pressurizing the ultra-long and ultra-thin carbide blade blank and reducing deformation during the sintering process. At the same time, because the upper pressing block on the lower surface of the upper pressing plate is provided with multiple upper pressing teeth on the inclined surface where it contacts the blade blank, and the lower pressing block on the upper surface of the lower pressing plate is provided with multiple lower pressing teeth on the inclined surface where it contacts the blade blank, air circulation is facilitated during the sintering process, ensuring a consistent carbon atmosphere on the upper and lower surfaces of the blade blank, thereby reducing deformation during sintering. This boat for sintering ultra-long and ultra-thin cemented carbide blade blanks has a reasonable design, a simple structure, saves materials, and provides excellent performance. It is conducive to reducing sintering deformation of ultra-long and ultra-thin cemented carbide blade blanks and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks according to the utility model.

[0017] Figure 2 The utility model is a schematic diagram of the partial structure of the assembly of the adjusting screw, the upper pressure plate, the fixing ring and the fixing key of the preferred embodiment of the boat for sintering ultra-long and ultra-thin carbide blade blanks.

[0018] Figure 3 It is a front view of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks described in the utility model.

[0019] Figure 4 The utility model is a partial structural diagram of an upper pressing plate, a lower pressing plate and a blade blank of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks.

[0020] Figure 5 The utility model is a schematic diagram of the overall structure of the upper pressing plate of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks.

[0021] Figure 6 It is a schematic diagram of the overall structure of a lower pressure plate of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks described in the utility model. DETAILED DESCRIPTION

[0022] The present invention provides a preferred embodiment of a sintering boat for ultra-long and ultra-thin carbide blade blanks. To make the purpose, technical solution, and effects of the present invention more clear and explicit, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0023] Please also see Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 .in, Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks according to the utility model. Figure 2 The utility model is a schematic diagram of the partial structure of the assembly of the adjusting screw, the upper pressure plate, the fixing ring and the fixing key of the preferred embodiment of the boat for sintering ultra-long and ultra-thin carbide blade blanks. Figure 3 It is a front view of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks described in the utility model. Figure 4 The utility model is a partial structural diagram of an upper pressing plate, a lower pressing plate and a blade blank of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks. Figure 5 The utility model is a schematic diagram of the overall structure of the upper pressing plate of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks. Figure 6 It is a schematic diagram of the overall structure of a lower pressure plate of a preferred embodiment of a boat for sintering ultra-long and ultra-thin cemented carbide blade blanks described in the utility model.

[0024] The utility model provides a boat for sintering an ultra-long and ultra-thin cemented carbide blade blank, which comprises an upper pressing plate 1, a lower pressing plate 2, an adjusting screw 3, a fixing ring 4 and a fixing key 5.

[0025] A plurality of upper pressing blocks 11 with a right-angled triangle cross section are provided on the lower surface of the upper pressing plate 1 , a plurality of upper pressing teeth 12 are provided on the inclined surface of the upper pressing blocks 11 with a right-angled triangle cross section, and four through holes 13 are provided at the four corners of the upper pressing plate 1 .

[0026] A stopper 21 and a plurality of lower pressing blocks 22 with a right-angled triangle cross section are provided on the upper surface of the lower pressing plate 2, a plurality of lower pressing teeth 23 are provided on the inclined surface of the lower pressing block 22 with a right-angled triangle cross section, a placement notch 24 is provided near the lower pressing plate 2 on the vertical right-angled surface of the stopper 21 and the lower pressing block 22 with a right-angled triangle cross section, and four threaded holes 25 and four scales 26 are provided at the four corners of the lower pressing plate 2.

[0027] The upper portion of the adjusting screw 3 is provided with a hand wheel 31 , a rotating handle 32 and a keyway through hole 33 , and the lower portion of the adjusting screw 3 is provided with a thread 34 .

[0028] The distance between the upper surface of the keyway through hole 33 and the lower surface of the handwheel 31 is greater than the sum of the thicknesses of the upper pressure plate 1 and the fixing ring 4 by 2 mm. The cross-sectional shapes of the fixing key 5 and the keyway through hole 33 are both square and the same size. The length of the fixing key 5 is greater than the outer diameter of the adjusting screw 3, the inner diameter of the fixing ring 4 is greater than the outer diameter of the adjusting screw 3, and the outer diameter of the adjusting screw 3 is smaller than the inner diameter of the through hole 13.

[0029] The upper pressing plate 1, the lower pressing plate 2, the adjusting screw 3, the fixing ring 4 and the fixing key 5 of the boat for sintering the ultra-long and ultra-thin cemented carbide blade blank are all made of graphite material.

[0030] The beneficial effects are as follows: The utility model provides a sintering boat for ultra-long and ultra-thin cemented carbide blade blanks, comprising an upper pressing plate 1, a lower pressing plate 2, an adjusting screw 3, a fixing ring 4, and a fixing key 5. The adjusting screw 3 passes through the through hole 13 of the upper pressing plate 1 and the fixing ring 4, and is inserted into the threaded hole 25 of the lower pressing plate 2 in a threaded connection manner, thereby fixing the upper pressing plate 1 and the lower pressing plate 2 together. The fixing key 5 is inserted into the keyway through hole 33 of the adjusting screw 3, thereby fixing the fixing ring 4 between the fixing key 5 and the upper pressing plate 1.

[0031] During operation, the ultra-long, ultra-thin carbide blade blank 6 is inserted between the upper pressing plate 1 and the lower pressing plate 2 and tilted onto the inclined surface of the lower pressing block 22 of the lower pressing plate 2. The downward-facing long side of the blade blank 6 is engaged with the placement notch 24 of the lower pressing plate 2. The handwheel 31 of the adjusting screw 3 is turned so that the adjusting screw 3 is screwed into the threaded hole 25 of the lower pressing plate 2 and lowered. Since the upper pressing plate 1 is fixed between the handwheel 31 of the adjusting screw 3 and the fixing ring 4, the upper pressing plate 1 also descends until the upper pressing teeth 12 of the upper pressing block 11 on the lower surface of the upper pressing plate 1 press the blade blank 6. The height of the upper pressing plate 1 is observed by using four scales 26 provided at the four corners of the lower pressing plate 2. The handwheel 31 of the adjusting screw 3 is turned so that the four corners of the upper pressing plate 1 are at the same height, so that the ultra-long, ultra-thin carbide blade blank 6 is subjected to uniform pressure, thereby reducing deformation during the sintering process. At the same time, because the upper pressing block 11 on the lower surface of the upper pressing plate 1 is provided with a plurality of upper pressing teeth 12 on the inclined surface where it contacts the blade blank 6, and the lower pressing block 22 on the upper surface of the lower pressing plate 2 is provided with a plurality of lower pressing teeth 23 on the inclined surface where it contacts the blade blank, air circulation is facilitated during the sintering process, ensuring that the carbon atmosphere on the upper and lower surfaces of the blade blank 6 is consistent, thereby reducing deformation during the sintering process. This ultra-long and ultra-thin cemented carbide blade blank sintering boat has a reasonable design, a simple structure, saves materials, and has excellent performance. It is conducive to reducing sintering deformation of ultra-long and ultra-thin cemented carbide blade blanks and is easy to promote and use.

[0032] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A boat for sintering ultra-long and ultra-thin cemented carbide blade blanks, comprising an upper pressing plate, a lower pressing plate, an adjusting screw, a fixing ring and a fixing key, characterized in that: The lower surface of the upper pressing plate is provided with a plurality of upper pressing blocks with a right-angled triangle cross section, the inclined surface of the upper pressing block with a right-angled triangle cross section is provided with a plurality of upper pressing teeth, the four corners of the upper pressing plate are provided with four through holes, the upper surface of the lower pressing plate is provided with a stopper and a plurality of lower pressing blocks with a right-angled triangle cross section, the inclined surface of the lower pressing block with a right-angled triangle cross section is provided with a plurality of lower pressing teeth, the vertical right-angled surface of the stopper and the lower pressing block with a right-angled triangle cross section is provided with a placement notch near the lower pressing plate, the four corners of the lower pressing plate are provided with four threaded holes and four scales, The upper section of the adjusting screw is provided with a handwheel, a rotating handle and a keyway through hole, and the lower section of the adjusting screw is provided with a thread. The distance between the upper surface of the keyway through hole and the lower surface of the handwheel is greater than the sum of the thicknesses of the upper pressure plate and the fixing ring by 2-5 mm. The cross-sectional shapes of the fixing key and the keyway through hole are both square and consistent in size. The length of the fixing key is greater than the outer diameter of the adjusting screw, the inner diameter of the fixing ring is greater than the outer diameter of the adjusting screw, and the outer diameter of the adjusting screw is smaller than the inner diameter of the through hole. The upper pressure plate, lower pressure plate, adjusting screw, fixing ring and fixing key of the boat for sintering ultra-long and ultra-thin carbide blade blanks are all made of graphite material.

Images