CN215508980U - Special-shaped blade sintering boat - Google Patents
Special-shaped blade sintering boat Download PDFInfo
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- CN215508980U CN215508980U CN202121841169.1U CN202121841169U CN215508980U CN 215508980 U CN215508980 U CN 215508980U CN 202121841169 U CN202121841169 U CN 202121841169U CN 215508980 U CN215508980 U CN 215508980U
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Abstract
The utility model provides a special-shaped blade sintering boat which comprises a substrate and supporting point arrays distributed on the substrate in a dispersing mode, wherein supporting points are of a trapezoid-like structure, the upper portion of the supporting point array is of a cylindrical structure, the lower portion of the supporting point array is a circular truncated cone with an arc-shaped side face, holes are formed in four corners of the substrate, and the boat can be stacked in a multi-layer mode through combination of supporting columns. The angle between the boat substrate and the fulcrum is reduced through the trapezoid-like fulcrum, the internal stress of the ceramic coating is reduced, chaps caused by repeated heating of sintering are reduced, the service life of the boat is prolonged, and the production cost is reduced; the supporting points are supported on the clamping surface of the blade, so that the cutting edge of the blade is suspended in the gap between the supporting points, the cutting edge of the blade is not contacted with the boat, and the blade quality is improved; use the embedding type pillar to connect between with boat and the boat, avoided the boat to shift the risk of sliding that takes place to the sintering of various size products has been promoted to accessible adjusting support height, has satisfied the sintering of all kinds of sizes products.
Description
Technical Field
The utility model belongs to the technical field of powder metallurgy, and particularly relates to a sintering boat for a special-shaped blade.
Background
With the high development of industry, the demand of hard alloy numerical control blades is more and more, and in order to meet some special processing purposes, nonstandard special-shaped blades develop rapidly. In the production of cemented carbide, graphite boats are commonly used to contain the compacts for sintering. When sintering conventional standard products, flat graphite plates are generally used as boats, but flat plate boats are not easy to arrange neatly and are easy to move during sintering transfer to cause collapse. To some products that are irregular in shape, small in bottom area, easy to topple over, often can design specific boat and sinter, and special-shaped blade is higher than the clamping face of blade because the blade height, if direct level is placed the sintering and can lead to the blade to warp, influences the product and uses. At present, the vertical placement is mainly adopted for sintering, but the vertical sintering causes the quality problems of deformation and the like of the contact surface between the blade and the boat, so that the conventional boat used at present is not suitable for sintering the special-shaped blade.
In order to prevent the phenomenon of boat adhesion during sintering of hard alloy, a conventional boat is often coated with a disposable coating, the coating basically contains chemical raw materials such as tween, formaldehyde, PEG, carbon black and alumina, and the coating has complex components, pollutes the environment and has certain damage to a human body. Has been gradually replaced by plasma sprayed ceramic coatings which are environmentally friendly and have a long service life. However, the improper structure of the boat can cause large internal stress of the coating, and the coating is cracked due to repeated heating in the sintering process of the hard alloy, so that the service life is shortened. Therefore, there is a need for a boat of a special structure for sintering of the profile insert to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects and shortcomings in the prior art, the utility model aims to provide the graphite boat for sintering the special-shaped blade, wherein the graphite boat is supported on the clamping surface of the blade by using a fulcrum to sinter, so that the problem that the blade edge directly contacts the boat to sinter is solved, and the quality of the blade is improved. The specific technical scheme is as follows:
the utility model provides a heterotypic blade sintering boat which characterized in that: the support comprises a substrate and support arrays, wherein the support arrays are distributed on the graphite substrate, and the supports are all in a trapezoid-like structure.
Further, the base plate and the fulcrum array are integrally machined and formed by graphite plates, and the distance between the graphite fulcrums is adjusted according to the size of the blade.
Further, the surface of the graphite boat is provided with a ceramic coating.
Preferably, the ceramic coating is plasma sprayed Y2O3A ceramic.
Furthermore, the graphite fulcrum consists of an upper part and a lower part, wherein the upper part is of a cylindrical structure, and the lower part is a circular table with an arc-shaped side surface.
Furthermore, the diameters of the upper bottom surface of the circular truncated cone and the lower bottom surface of the upper cylinder are the same, and the cambered surface of the circular truncated cone is tangent to the side surface of the upper cylinder.
Furthermore, the included angle between the tangent of the arc surface of the circular truncated cone and the contact point of the substrate and the shape of the substrate is less than 20 degrees.
Preferably, the side arc line of the circular truncated cone is a quarter circle, the bottom of the circular truncated cone is tangent to the graphite substrate, and the upper part of the circular truncated cone is tangent to the cylinder.
In the high-temperature sintering process, because the graphite fulcrum and the substrate have a certain connection angle, the ceramic coating sprayed on the surface of the sintering boat is easy to generate internal stress, particularly the contact point of the graphite substrate and the graphite fulcrum is easy to generate extrusion stress when being heated and expanded, and the repeated sintering is easy to cause chapping. If a cylindrical fulcrum is adopted, the internal stress of the ceramic coating of the boat is larger. According to the trapezoid-like fulcrum provided by the utility model, the lower circular truncated cone adopts the design of the arc-shaped side surface, so that the angle between the graphite substrate of the boat and the side surface of the graphite fulcrum can be reduced. The included angle between the tangent line of the contact point of the cambered surface of the circular truncated cone and the substrate and the shape of the substrate is controlled to be less than 20 degrees, so that the internal stress of the ceramic coating can be greatly reduced, and the service life of the sintering boat is prolonged. Through further forming the tangent structure at the contact point of graphite base plate and graphite fulcrum through integrated into one piece processing, be about to the side of graphite base plate and graphite fulcrum and combine together, form smooth transition district, more can reduce ceramic coating's internal stress, reduce because of the sintering is heated chap that arouses repeatedly, promoted boat life, reduced manufacturing cost.
The graphite fulcrums distributed and arranged on the graphite substrate are supported on the clamping surface of the blade, so that the cutting edge of the blade is suspended in the gap between the fulcrums, and the distance between the graphite fulcrums is adjusted according to the size of the blade, so that the cutting edge of the blade does not contact the boat, and the quality of the blade is improved. In addition, the upper part of the graphite fulcrum is arranged to be regular cylindrical instead of being trumpet-shaped like an arc table surface at the lower part, and when the special-shaped blade is supported on the graphite fulcrum, the phenomenon that the convex cutting edge of the special-shaped blade is contacted or contacted with the side surface of the graphite fulcrum to influence the sintering quality can be avoided or reduced.
Furthermore, a circular hole is distributed at each of four corners of the graphite substrate, and the boat is connected with the boat through a support matched with the circular hole.
Furthermore, the pillar is composed of cylinders with two small ends and a large middle part, and the diameters of the cylinders at the two ends are in clearance fit with the circular holes of the graphite substrate.
Furthermore, the round hole is a through hole, and the height of the small cylinders at the two ends of the support is half of the depth of the through hole; or the circular holes are symmetrically arranged on two sides of the graphite substrate and are not communicated, and the hole depth of the circular holes is larger than or equal to the height of the small cylinders at the two ends of the support.
According to the utility model, the round holes are respectively arranged at the four corners of the boat graphite substrate, so that the boat and the boat can be connected through the embedded support columns, the simultaneous sintering of the multiple layers of boats can be conveniently placed and stacked, the production efficiency is improved, the stability of the boat is ensured, the sliding risk caused by the transfer of the boat is avoided, the sintering requirements of products of various sizes can be met by replacing or adjusting the height of the support columns, and the sintering efficiency is improved.
Compared with the prior art, the utility model has the following beneficial effects:
1. the blade is supported on the clamping surface of the blade by utilizing the supporting points, and the cutting edge of the blade is suspended in the gap between the supporting points, so that the cutting edge of the blade does not contact the boat, and the quality of the blade is improved.
2. The utility model provides a trapezoid-like fulcrum, and the angle between the boat reference surface and the fulcrum is reduced, so that the internal stress of a ceramic coating is reduced, chaps caused by repeated heating in sintering are reduced, the service life of the boat is prolonged, and the production cost is reduced.
3. The boat is connected with the boat through the embedded support columns, so that the sliding risk caused by transfer of the boat is avoided, the sintering of products with various sizes can be met by adjusting the heights of the support columns, and the sintering efficiency is improved.
Drawings
Fig. 1 is a perspective view of a special-shaped sintering boat;
fig. 2(a) is a front view of a profile sintering boat;
fig. 2(b) is a plan view of the profile sintering boat;
FIG. 3(a) is a front view of a strut;
FIG. 3(b) is a top view of the support post;
fig. 4 is a schematic view of a profiled insert.
The cutting tool comprises a base plate 1, a fulcrum 2, a support 3, a circular hole 4, a clamping surface 5 and a cutting edge 6.
Detailed Description
In order to better explain the present invention and to facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
According to one technical scheme of the utility model, firstly, a special-shaped sintering boat is provided, as shown in fig. 1-3, comprising a substrate 1 and fulcrums 2, wherein the fulcrums 2 are dispersedly arranged on the substrate 1, an array of the substrate 1 and the fulcrums 2 is integrally formed by machining a graphite plate, the distance between the graphite fulcrums 2 is adjusted according to the size of a blade, and the fulcrum array can be regularly arranged or irregularly arranged and adjusted according to the shapes of a specific blade supporting surface and a cutting edge. In this embodiment, graphite fulcrum 2 is type of trapezoidal round platform structure, by upper and lower two parts constitution, and upper portion is regular cylindrical structure, and the lower part is that the side is curved round platform, the last bottom surface of lower part round platform with the cylindrical lower bottom surface diameter in upper portion is the same, the cambered surface of round platform is tangent with the cylindrical side in upper portion, the cambered surface of round platform and graphite substrate's contained angle is less than 20, there is ceramic coating on the surface of graphite boat. Four corners of the graphite substrate 1 are respectively distributed with a round hole 4, and the boat is connected with the boat by a strut 3 matched with the round holes. The pillar 3 is composed of cylinders with small ends and large middle, and the diameters of the cylinders at the two ends are in clearance fit with the circular holes of the graphite substrate. The circular hole is a through hole, and the height of the small cylinders at the two ends of the support column is half of the depth of the through hole.
According to another technical scheme provided by the utility model, the circular holes are symmetrically arranged on two surfaces of the graphite substrate and are not communicated, and the hole depth of the circular holes is greater than or equal to the height of the small cylinders at two ends of the support.
According to another technical scheme of the utility model, the arc line of the side surface of the circular truncated cone is a quarter circle, the bottom of the circular truncated cone is tangent to the graphite substrate, and the upper part of the circular truncated cone is tangent to the cylinder.
In the specific production process, the graphite plate is machined and integrally formed to obtain the graphite plate which comprises the substrate and the trapezoid-like fulcrum arraySintering boat, the cambered surface of fulcrum lower part arc round platform and graphite substrate's contained angle are 10.8, and fulcrum bottom diameter is 15mm, and upper portion cylinder diameter is 6mm, respectively processes the hole of a placing pillar in four angles of graphite substrate to it has Y to plasma spraying on the surface of sintering boat2O3A ceramic. The boat is laminated in multiple layers by the combination of the support columns. The special-shaped blade shown in fig. 4 is horizontally placed on a fulcrum of the special-shaped sintering boat, the fulcrum 2 is in contact with a clamping surface 5 in the center of the blade, the cutting edge 6 is positioned between the fulcrum and is not in contact with any part of the boat, and a spacing distance is also left between the blade and is not in contact with each other. Experiments show that when the sintering boat with the coating of the embodiment is used for sintering the plane blade with the cobalt content of 10 wt%, the specific sintering temperature is 1430 ℃, the sintering time is 1.0h each time, the sintering life is 95 times, the coating chapping phenomenon occurs when the boat with the cylindrical fulcrum prepared by the same process is sintered for 20 times, and the coating begins to fall off in a large area when the boat is sintered for 42 times.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a heterotypic blade sintering boat which characterized in that: the supporting device comprises a substrate (1) and supporting points (2), wherein the array of the supporting points (2) is distributed on the substrate (1), the supporting points (2) are of a trapezoid-like structure and are composed of an upper part and a lower part, the upper part is of a cylindrical structure, and the lower part is of a round table with an arc-shaped side surface.
2. The profile blade sintering boat as set forth in claim 1, wherein: the base plate (1) and the fulcrum (2) array are integrally formed by graphite plates, and the distance between the fulcrums is adjusted according to the size of the blade.
3. The profile blade sintering boat as set forth in claim 1, wherein: the surface of the sintering boat is provided with a ceramic coating.
4. The profile blade sintering boat as set forth in claim 3, wherein: the ceramic coating is plasma sprayed Y2O3A ceramic.
5. The profile blade sintering boat as set forth in claim 1, wherein: the diameter of the upper bottom surface of the arc-shaped circular truncated cone is the same as that of the lower bottom surface of the upper cylinder, and the arc surface of the circular truncated cone is tangent to the side surface of the upper cylinder.
6. The profile blade sintering boat as set forth in any one of claims 1 to 5, wherein: the included angle between the tangent of the contact point of the cambered surface of the circular truncated cone and the substrate (1) and the shape of the substrate (1) is less than 20 degrees.
7. The profile blade sintering boat as set forth in claim 6, wherein: the arc line of the side surface of the circular truncated cone is a quarter circle, the bottom of the arc line is tangent with the graphite substrate, and the upper part of the arc line is tangent with the cylinder.
8. The profile blade sintering boat as set forth in claim 1, wherein: four corners of the base plate (1) are respectively distributed with a round hole (4), and the boat is connected with the boat through a strut (3) matched with the round holes (4).
9. The profile blade sintering boat as set forth in claim 8, wherein: the support column (3) is composed of cylinders with small ends and large middle, and the diameters of the cylinders at the two ends are in clearance fit with the circular holes (4) of the substrate.
10. The profile blade sintering boat as set forth in claim 9, wherein: the round hole (4) is a through hole, and the height of the small cylinders at the two ends of the strut (3) is half of the depth of the through hole; or the circular holes (4) are symmetrically arranged on two sides of the graphite substrate and are not communicated, and the hole depth is greater than or equal to the height of the small cylinders at the two ends of the support column (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121841169.1U CN215508980U (en) | 2021-08-09 | 2021-08-09 | Special-shaped blade sintering boat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121841169.1U CN215508980U (en) | 2021-08-09 | 2021-08-09 | Special-shaped blade sintering boat |
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| CN215508980U true CN215508980U (en) | 2022-01-14 |
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| CN202121841169.1U Active CN215508980U (en) | 2021-08-09 | 2021-08-09 | Special-shaped blade sintering boat |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114906851A (en) * | 2022-04-20 | 2022-08-16 | 崇义章源钨业股份有限公司 | Preparation method of nano tungsten carbide with high specific surface area |
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2021
- 2021-08-09 CN CN202121841169.1U patent/CN215508980U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114906851A (en) * | 2022-04-20 | 2022-08-16 | 崇义章源钨业股份有限公司 | Preparation method of nano tungsten carbide with high specific surface area |
| CN114906851B (en) * | 2022-04-20 | 2023-09-19 | 崇义章源钨业股份有限公司 | Preparation method of nano tungsten carbide with high specific surface area |
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