CN111390183A - Manufacturing process of hard alloy, metal cutting tool and die - Google Patents
Manufacturing process of hard alloy, metal cutting tool and die Download PDFInfo
- Publication number
- CN111390183A CN111390183A CN202010320805.XA CN202010320805A CN111390183A CN 111390183 A CN111390183 A CN 111390183A CN 202010320805 A CN202010320805 A CN 202010320805A CN 111390183 A CN111390183 A CN 111390183A
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- CN
- China
- Prior art keywords
- hard alloy
- powder
- layer
- manufacturing process
- cemented carbide
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
Abstract
The invention discloses a manufacturing process of hard alloy, which belongs to the technical field of hard alloy manufacturing and comprises the working procedures of powder pressing and sintering, wherein the powder at least comprises two layers and is pressed and bonded by adopting a method of sequentially pressing layer by layer during powder pressing. The hard alloy prepared by the manufacturing process of the hard alloy can be adjusted according to the requirement to prepare the hard alloy with both hardness and bending strength, thereby improving the comprehensive performance of products such as cutters, moulds and the like and prolonging the service life.
Description
Technical Field
The invention belongs to the technical field of hard alloy production, and particularly relates to a manufacturing process of hard alloy, a metal cutting tool and a die.
Background
Cemented carbide is an alloy material made from a hard compound of refractory metals and a binder metal by a powder metallurgy process. The hard alloy has a series of excellent performances of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, particularly high hardness and wear resistance, basically keeps unchanged even at the temperature of 500 ℃, and still has high hardness at the temperature of 1000 ℃. However, the hard alloy has a large brittleness, and is difficult to be directly manufactured into an integral cutter with a complex shape, so that the hard alloy is often manufactured into blades with different shapes and is installed on a cutter body or a die body for use by adopting methods such as welding, bonding, mechanical clamping and the like. The existing hard alloy is often difficult to have both hardness and toughness, but in engineering application, the hard alloy is generally required to have certain toughness and better bending strength when having excellent hardness and rigidity, and like a common metal material, the hard alloy has the higher hardness and rigidity, the weaker toughness and bending strength and relatively brittle texture. The most common metal cutting tools have disadvantages of cemented carbide, such as high hardness and high wear resistance, but when the hardness and wear resistance are improved, the toughness of the tool itself is accordingly deteriorated, the tool is liable to be chipped during cutting, and the service life is not long. Therefore, in the prior art, the cutting edge of the tool is usually fixed on the tool body made of non-cemented carbide with certain toughness by welding cemented carbide, so as to avoid the problem that the cemented carbide is easy to break when being directly used as a whole tool for cutting, but the cemented carbide has extremely high hardness and poor welding performance, and even if the cemented carbide is welded on the tool body as the cutting edge, the cutting edge is easy to separate from the tool body during the cutting operation, and the daily use requirement can not be met. In order to achieve the combination of hardness and bending strength of cemented carbide, the prior art often uses a series of measures such as improving the whole cemented carbide production process, or using high-quality equipment, or adjusting the types of the raw materials of cemented carbide, adding special elements, or changing the specific ratio of the raw materials of cemented carbide, but none of them achieve ideal results, and the hardness and bending strength of cemented carbide are always a pair of spearheads, which is difficult to achieve.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a process for producing a cemented carbide, which can achieve both high hardness and good bending strength.
The technical scheme of the invention is as follows: the invention provides a manufacturing process of hard alloy, which comprises the working procedures of pressing and sintering powder, wherein the powder at least comprises two layers, and the powder is pressed and bonded by adopting a method of sequentially pressing layer by layer.
Based on the hard alloy, the invention also provides a metal cutting tool and a die, wherein the metal cutting tool comprises a tool body and a cutting edge, and the cutting edge and the die are processed and manufactured by the hard alloy.
The invention has the beneficial effects that: the hard alloy prepared by the manufacturing process provided by the invention can be adjusted to prepare the hard alloy with both hardness and bending strength according to requirements, the comprehensive performance of products such as cutters and dies is improved, the service life is prolonged, equipment of the whole process production line does not need to be adjusted greatly, extra special element assistance does not need to be added, and the whole process is still simple, so that the manufacturing cost is not increased greatly.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Element number description: the powder comprises a first layer of powder 1, a second layer of powder 2, an Nth layer of powder 3, a pressing plate 4 and a press spindle 5.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
the embodiment provides a manufacturing process of a hard alloy, which includes a powder pressing and sintering process as in the existing hard alloy preparation, and unlike the prior art, the powder in the manufacturing process includes at least two layers according to the performance requirements of the hard alloy, and the powder is pressed and bonded by adopting a method of sequentially pressing layer by layer. For example, when two layers of powder are arranged for pressing, the main shaft 5 of the press drives the pressing plate 4 to press downwards, and after the first layer of powder 1 is pressed in the cavity of the grinding tool, another layer of powder raw material is covered, namely, the second layer of powder 2 is covered, and for a more-layer structure, pressing is continued again, and finally, after the nth layer of powder 3 is covered, after all the powder layers are pressed together in sequence, the subsequent sintering process is carried out, so that the required hard alloy is obtained. The hard alloy prepared by the method for pressing the multilayer powder into the blank by times has extremely high hardness, still has larger bending strength, and can fully meet the requirements of excellent comprehensive properties such as cutters, dies and the like on high hardness and good bending strength. During specific manufacturing, the powder raw materials are subjected to ball milling, evaporation to dryness, screening, granulation, screening, mixing, pressing and sintering. When the hard alloy prepared by the process is used for processing and manufacturing the cutting edges of the die and the metal cutting tool, the die and the cutting edges have the characteristics of hardness and bending strength, and the working performance can be greatly improved. To illustrate the manufacturing process more specifically, the following examples illustrate two cemented carbides, based on the preparation process of the present invention:
example 1: a hard alloy CG05 is prepared from the following raw materials: 94 percent of tungsten carbide with the granularity of 0.6, 5 percent of cobalt and 1 percent of other elements which are selected and matched according to the requirement; the raw materials are uniformly mixed according to the proportion and then are pressed, the thickness of the first layer is 1.25mm, the thickness of the second layer is 4mm, and the pressure F is 300 tons during pressing each time.
Example 2: the surface layer of the other hard alloy CG10FF is prepared from the CG05, and the lower layer is prepared from the following materials: 85% of tungsten carbide with the grain size of 3.0 and 15% of cobalt. The raw materials are uniformly mixed according to the proportion, and then are pressed, wherein the thickness of the surface layer is 3.5mm, the thickness of the lower layer is 1.75mm, the thickness of the first layer is 2.5mm, the thickness of the second layer is 1mm, and the pressure is 300 tons during pressing each time.
In this embodiment, the material quality test of the two types of cemented carbide (CG10FF \ CG05) entrusted technical precision cutters (saddletree) limited company is performed, and the test results are as follows:
according to the above detection results, it can be seen that both the hard alloys manufactured by the manufacturing method provided by the present invention have extremely high hardness, which can reach about 95HRA, but it is known to those skilled in the art that the hardness of the hard alloy of the same material on the market can only be generally up to 93HRA, and the bending strength of the hard alloy of 93HRA is generally poor, and it is obvious from the above experimental data that the bending strength performance of the hard alloy of the present invention is not inferior to that of the existing hard alloy of the same or similar material, for example, the bending strength (TRS.) of the existing hard alloy of the same material as sample 1 is generally less than 373, and the bending strength (TRS.) of the hard alloy of the same material as sample 2 is generally less than 200, which shows that the hard alloy manufactured by the present invention has no doubt realized hardness relative to the existing hard alloy, Has both bending strength and bending strength.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. The manufacturing process of the hard alloy comprises the steps of pressing and sintering powder, and is characterized in that: the powder comprises at least two layers, the powder is pressed layer by layer in sequence and is bonded, the former layer is pre-pressed and formed, then the other layer of powder is added, and then the powder and the powder are pressed together to form a blank.
2. The process of manufacturing a cemented carbide according to claim 1, wherein the powder comprises tungsten carbide and cobalt mixed homogeneously.
3. The manufacturing process of the cemented carbide according to claim 1, wherein the manufacturing process of the powder is specifically: ball milling, drying by distillation, screening, granulating, screening, mixing, pressing and sintering.
4. The process for manufacturing a cemented carbide according to claim 1 wherein the powder is in two layers.
5. A metal cutting tool, characterized by: comprising a tool body and a cutting edge, said cutting edge being machined from a cemented carbide according to any one of claims 1-4.
6. A mold, characterized in that: manufactured by machining a cemented carbide according to any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010320805.XA CN111390183A (en) | 2020-04-22 | 2020-04-22 | Manufacturing process of hard alloy, metal cutting tool and die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010320805.XA CN111390183A (en) | 2020-04-22 | 2020-04-22 | Manufacturing process of hard alloy, metal cutting tool and die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111390183A true CN111390183A (en) | 2020-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010320805.XA Pending CN111390183A (en) | 2020-04-22 | 2020-04-22 | Manufacturing process of hard alloy, metal cutting tool and die |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020059850A1 (en) * | 2000-11-22 | 2002-05-23 | Lars-Ake Engstrom | Multiple grade cemented carbide inserts for metal working and method of making the same |
| US20070025872A1 (en) * | 2005-07-29 | 2007-02-01 | Sandvik Intellectual Property Ab | Method of making a submicron cemented carbide powder mixture with low compacting pressure and the resulting powder |
| CN101605919A (en) * | 2006-11-20 | 2009-12-16 | 株式会社宫永 | Hard tip and manufacture method thereof |
| CN105945291A (en) * | 2016-07-01 | 2016-09-21 | 山东大学 | Bicrystal gradient hard alloy cutter material and preparation method thereof |
| CN106735167A (en) * | 2016-12-15 | 2017-05-31 | 鑫京瑞钨钢（厦门）有限公司 | A kind of preparation method of extra-coarse grained carbide alloy gradient DRILL POINT DIES |
-
2020
- 2020-04-22 CN CN202010320805.XA patent/CN111390183A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020059850A1 (en) * | 2000-11-22 | 2002-05-23 | Lars-Ake Engstrom | Multiple grade cemented carbide inserts for metal working and method of making the same |
| US20070025872A1 (en) * | 2005-07-29 | 2007-02-01 | Sandvik Intellectual Property Ab | Method of making a submicron cemented carbide powder mixture with low compacting pressure and the resulting powder |
| CN101605919A (en) * | 2006-11-20 | 2009-12-16 | 株式会社宫永 | Hard tip and manufacture method thereof |
| CN105945291A (en) * | 2016-07-01 | 2016-09-21 | 山东大学 | Bicrystal gradient hard alloy cutter material and preparation method thereof |
| CN106735167A (en) * | 2016-12-15 | 2017-05-31 | 鑫京瑞钨钢（厦门）有限公司 | A kind of preparation method of extra-coarse grained carbide alloy gradient DRILL POINT DIES |
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Application publication date: 20200710 |