CN110703166A - Method for testing mixture of tungsten carbide powder and cobalt powder - Google Patents
Method for testing mixture of tungsten carbide powder and cobalt powder Download PDFInfo
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- CN110703166A CN110703166A CN201911107717.5A CN201911107717A CN110703166A CN 110703166 A CN110703166 A CN 110703166A CN 201911107717 A CN201911107717 A CN 201911107717A CN 110703166 A CN110703166 A CN 110703166A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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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
-
- 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
- B22F3/10—Sintering only
-
- 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
- B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
Abstract
The application discloses a method for testing a mixture of tungsten carbide powder and cobalt powder, which comprises the steps of randomly taking out a part of the mixture of tungsten carbide powder and cobalt powder as a sample; weighing a preset weight from the sample and putting the preset weight into a die cavity of a die, wherein the preset weight is equal to the weight of the spherical tooth to be manufactured; carrying out bidirectional pressurization on the die cavity, and pressing the sample into a blank; sintering the blank to form a spherical tooth; and testing the magnetic value, the cobalt magnetic value and the density of the spherical teeth. According to the method for testing the mixture of the tungsten carbide powder and the cobalt powder, the mixture with the same weight as that of a final product can be sintered and then tested, so that the performance detection result of the sintered product can be more accurate, and a more effective basis is provided for parameter testing.
Description
Technical Field
The invention belongs to the technical field of hard alloy, and particularly relates to a test method of a tungsten carbide powder and cobalt powder mixture.
Background
The mixture adopted in the field of hard alloy consists of WC powder and cobalt powder, and the mixture is subjected to grinding, mixing, sintering and other processes to form hard alloy particles, wherein the hard alloy particles are used as a drill bit on a drilling tool. The quality of the mixture determines the quality of the hard alloy and the quality of the drill bit, and finally determines the service life of the drilling tool, so that the mixture needs to be tested in the process of producing the hard alloy to determine whether various performances of the mixture meet requirements, and the problem that the quality of the hard alloy does not reach the standard due to unqualified quality of the mixture is avoided.
The existing method for testing the mixture is as follows: firstly, sampling a large amount of mixed materials, then, carrying out die filling and adjustment on a universal die, then, carrying out compression molding on a sample, then, sintering the sample, and finally, identifying the sample. However, in the method in the prior art, a universal mold is adopted, the weight of the filled mixture is different from that of a final product manufactured by using the mixture, and therefore, various parameters including a magnetic value, a cobalt magnetic value, a density and the like are inevitably different from those of the final product, and therefore, a detection result is not accurate and cannot be used as an effective reference value.
Disclosure of Invention
In order to solve the problems, the invention provides a method for testing a mixture of tungsten carbide powder and cobalt powder, which can be used for testing after sintering the mixture with the same weight as that of a final product, so that a product performance detection result after sintering can be more accurate, and a more effective basis is provided for parameter testing.
The invention provides a test method of a tungsten carbide powder and cobalt powder mixture, which comprises the following steps:
randomly taking out a part of a batch of tungsten carbide powder and cobalt powder mixture as a sample;
weighing a preset weight from the sample and putting the preset weight into a die cavity of a die, wherein the preset weight is equal to the weight of the spherical tooth to be manufactured;
carrying out bidirectional pressurization on the die cavity, and pressing the sample into a blank;
sintering the blank to form a spherical tooth;
and testing the magnetic value, the cobalt magnetic value and the density of the spherical teeth.
Preferably, in the above method for testing a mixture of tungsten carbide powder and cobalt powder, randomly taking a part of a batch of the mixture of tungsten carbide powder and cobalt powder as a sample includes:
filling a batch of tungsten carbide powder and cobalt powder into 50 kg of each barrel, and numbering the barrels from No. 1 to No. 9;
the samples were formed by taking 200g of each of bucket nos. 2, 4, 6 and 8 and mixing them together.
Preferably, in the above method for testing a mixture of tungsten carbide powder and cobalt powder, the step of weighing a preset weight from the sample and placing the preset weight into a mold cavity of a mold is:
from the sample, 50g to 80g were weighed into the cavity of a mold.
Preferably, in the test method of the mixture of tungsten carbide powder and cobalt powder, the shape of the mold is a cylinder with a diameter of 12mm to 18mm and a height of 20mm to 30 mm.
Preferably, in the above method for testing a mixture of tungsten carbide powder and cobalt powder, the pressing the sample into a blank is:
three samples were pressed simultaneously into three blanks.
Preferably, in the above method for testing a mixture of tungsten carbide powder and cobalt powder, the sintering of the blank is:
and placing the blank on a boat, placing the blank on a fifth layer in a second area of a sintering furnace, and sintering for 24 hours at a temperature of 1380-1500 ℃ and a pressure of 50-80 kg.
Preferably, in the method for testing the mixture of tungsten carbide powder and cobalt powder, the step of testing the magnetic value, the cobalt magnetic value range and the density of the button comprises the following steps:
testing the magnetic force value of the spherical tooth by using a magnetometer, and testing the cobalt magnetic value of the spherical tooth by using a cobalt magnetic instrument;
testing the density of the spherical teeth by using a density meter;
when the magnetic value is between 11.2KA/m and 12.5KA/m, the cobalt magnetic value is between 5.6 percent and 5.9 percent, and the density is 14.9g/cm3To 15.0g/cm3In between, the test result is qualified, otherwise, the test result is unqualified.
According to the test method of the mixture of the tungsten carbide powder and the cobalt powder, which is provided by the invention, a part of the mixture of the tungsten carbide powder and the cobalt powder is randomly taken out from a batch of the mixture of the tungsten carbide powder and the cobalt powder as a sample; then weighing a preset weight from the sample and putting the preset weight into a die cavity of a die, wherein the preset weight is equal to the weight of the spherical tooth to be manufactured; then, the die cavity is pressurized in two directions, and the sample is pressed into a blank; sintering the blank to form a spherical tooth; and finally, testing the magnetic value, the cobalt magnetic value and the density of the spherical tooth, wherein the processing steps aim at a sample with the same weight as that of the spherical tooth to be manufactured, and sintering the sample to form the spherical tooth for testing, so that the obtained spherical tooth is the same as a final product, and each performance of the spherical tooth is more similar to that of the final spherical tooth product, so that the performance detection result of the sintered product is more accurate, and more effective basis can be provided for parameter testing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a testing method of a mixture of tungsten carbide powder and cobalt powder provided by the present application.
Detailed Description
The core of the invention is to provide a test method of the mixture of the tungsten carbide powder and the cobalt powder, which can test the mixture with the same weight as that of a final product after sintering, so that the performance test result of the product after sintering can be more accurate, and more effective basis is provided for parameter test.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of a method for testing a mixture of tungsten carbide powder and cobalt powder provided by the present application is shown in fig. 1, where fig. 1 is a schematic diagram of the method for testing the mixture of tungsten carbide powder and cobalt powder provided by the present application, and the method includes the following steps:
s1: randomly taking out a part of a batch of tungsten carbide powder and cobalt powder mixture as a sample;
it should be noted that the weight of the batch of the mixture of tungsten carbide powder and cobalt powder may be, but is not limited to, 400 kg, the batch of the mixture may be divided into a plurality of barrels, and then a part of the mixture is randomly taken out from the plurality of barrels to be mixed together, so that the judgment of the performance of the whole batch of the mixture is not affected due to the poor uniformity of the mixture of the materials at a certain position, the randomness of sampling can be better ensured by the step, and the performance of the whole batch of the mixture can be more accurately grasped.
S2: weighing a preset weight from a sample and putting the preset weight into a die cavity of a die, wherein the preset weight is equal to the weight of the spherical tooth to be manufactured;
the protective cover can be additionally arranged outside the weighing machine, so that interference of wind power and external factors during weighing can be prevented, the weighing weight is limited in the step, and therefore, different from the prior art, the weighing weight is limited to be the same as the weight of the ball gear to be manufactured, for example, if the weight of the ball gear to be manufactured is 67g, the sample of 67g is weighed, so that the tested performance is closer to the final product performance, and the test result is more accurate.
S3: carrying out bidirectional pressurization on the die cavity, and pressing the sample into a blank;
the step is a prior art means, and the applied pressure can be selected according to actual needs as long as the samples can be pressed into a whole.
S4: sintering the blank to form a spherical tooth;
specifically, the blank is put into a sintering furnace for sintering, and the ball gear for testing with the same shape as the final product is formed.
S5: and testing the magnetic value, the cobalt magnetic value and the density of the spherical teeth.
According to the above description, in the embodiment of the testing method of the mixture of tungsten carbide powder and cobalt powder provided by the present application, a part of the mixture of tungsten carbide powder and cobalt powder is randomly taken out as a sample; then weighing a preset weight from the sample and putting the preset weight into a die cavity of a die, wherein the preset weight is equal to the weight of the spherical tooth to be manufactured; then, carrying out bidirectional pressurization on the die cavity, and pressing the sample into a blank; sintering the blank to form a spherical tooth; finally, testing the magnetic value, the cobalt magnetic value and the density of the spherical tooth, and finding that the processing steps are directed at a sample with the same weight as that of the spherical tooth to be manufactured, sintering the sample to form the spherical tooth to be tested, so that the obtained spherical tooth is the same as a final product, and each performance of the spherical tooth is more similar to that of the final spherical tooth product, so that the performance detection result of the sintered product is more accurate, and more effective basis can be provided for parameter testing.
In one specific embodiment of the above method for testing a mixture of tungsten carbide powder and cobalt powder, randomly taking a part of a batch of the mixture of tungsten carbide powder and cobalt powder as a sample may include the following specific steps:
filling a batch of tungsten carbide powder and cobalt powder into 50 kg of each barrel, and numbering the barrels from No. 1 to No. 9;
after taking out 200g of each of the barrels No. 2, No. 4, No. 6 and No. 8, they were mixed together to form a sample.
It can be seen that the method ensures that the mixture in the sample comes from different barrels, so that the mixing effect is better ensured, and the problem that the mixing effect of a certain part is not good enough to cause poor testing effect is solved.
In another specific embodiment, the step of weighing the sample by a predetermined weight into the cavity of the mold may be specifically:
50g to 80g of the sample is weighed into the cavity of the mold, which is based on the weight of the final desired button, that is, 50g of the final desired button, and 50g of the mixture is selected in advance to prepare the button for testing in the test method, and 80g of the mixture is selected in advance to prepare the button for testing in the test method, and further, 67g of the button which is most commonly used at present is used, so that the weight of the sample is more preferably 67 g.
In yet another embodiment, the method may employ a mold having a cylindrical shape with a diameter of 12mm to 18mm and a height of 20mm to 30mm, the inner cavity of which has the same dimensions as the outer shape of the finally produced buttons, and the mixture can be pressed into the same shape as the buttons after being placed in the inner cavity of the cylindrical shape.
In addition, in order to improve the working efficiency of pressing, the step of pressing the sample into a blank may preferably be: three blank is pressed into with three sample simultaneously, can improve the twice to work efficiency like this, can not exert an influence to the test effect moreover.
The present application also provides a preferred embodiment, in which the step of sintering the blank may specifically be: the coating of the boat filled with the blank is brushed uniformly to ensure that the same boat is used for sintering, so that the consistency of the product quality can be ensured, because the performance of sintered spherical teeth can be changed due to different boats, the blank is placed on the boat, then the boat is placed at a specified position, the position can be preferably the fifth layer of the second area of a sintering furnace, because the temperature field and the atmosphere of the position are more stable and uniform, the performance of a sintered finished product can be ensured to be better, the sintered finished product is sintered for 24 hours at the temperature of 1380-1500 ℃ and the pressure of 50-80 kg, further, the sintering temperature can be preferably 1400 ℃, the pressure can be preferably 52 kg, and the finished alloy spherical teeth for testing can be obtained after sintering.
In the testing steps of the above embodiments, but not limited to, the magnetic force value of the button can be measured by a magnetometer, the cobalt magnetic value of the button can be measured by a cobalt magnetometer, and the density of the button can be measured by a density meter, and further, but not limited to, when the magnetic force value is between 11.2KA/m and 12.5KA/m, the cobalt magnetic value is between 5.6% and 5.9%, and the density is 14.9g/cm3To 15.0g/cm3In between, the test result is qualified, otherwise, the test result is unqualified. In addition, the performance of the mixture can be judged by detecting other parameters such as hardness and microstructure through combining a hardness tester and a metallographic microscope.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A test method of a mixture of tungsten carbide powder and cobalt powder is characterized by comprising the following steps:
randomly taking out a part of a batch of tungsten carbide powder and cobalt powder mixture as a sample;
weighing a preset weight from the sample and putting the preset weight into a die cavity of a die, wherein the preset weight is equal to the weight of the spherical tooth to be manufactured;
carrying out bidirectional pressurization on the die cavity, and pressing the sample into a blank;
sintering the blank to form a spherical tooth;
and testing the magnetic value, the cobalt magnetic value and the density of the spherical teeth.
2. The method for testing a mixture of tungsten carbide powder and cobalt powder as claimed in claim 1, wherein said randomly taking a portion of a batch of the mixture of tungsten carbide powder and cobalt powder as a sample comprises:
filling a batch of tungsten carbide powder and cobalt powder into 50 kg of each barrel, and numbering the barrels from No. 1 to No. 9;
the samples were formed by taking 200g of each of bucket nos. 2, 4, 6 and 8 and mixing them together.
3. The method for testing the mixture of tungsten carbide powder and cobalt powder as claimed in claim 1, wherein the step of weighing the sample by a predetermined weight into a die cavity of a die is as follows:
from the sample, 50g to 80g were weighed into the cavity of a mold.
4. The method for testing a mixture of tungsten carbide powder and cobalt powder as claimed in claim 1, wherein the shape of the mold is a cylinder with a diameter of 12mm to 18mm and a height of 20mm to 30 mm.
5. The method for testing the mixture of tungsten carbide powder and cobalt powder as claimed in claim 1, wherein the pressing the sample into a blank is:
three samples were pressed simultaneously into three blanks.
6. The method for testing the mixture of tungsten carbide powder and cobalt powder as claimed in claim 1, wherein the sintering of the blank is:
and placing the blank on a boat, placing the blank on a fifth layer in a second area of a sintering furnace, and sintering for 24 hours at a temperature of 1380-1500 ℃ and a pressure of 50-80 kg.
7. The method for testing the mixture of tungsten carbide powder and cobalt powder as claimed in any one of claims 1 to 6, wherein the testing the magnetic value, the cobalt magnetic value range and the density of the button comprises:
testing the magnetic force value of the spherical tooth by using a magnetometer, and testing the cobalt magnetic value of the spherical tooth by using a cobalt magnetic instrument;
testing the density of the spherical teeth by using a density meter;
when the magnetic value is between 11.2KA/m and 12.5KA/m, the cobalt magnetic value is between 5.6 percent and 5.9 percent, and the density is 14.9g/cm3To 15.0g/cm3In between, the test result is qualified, otherwise, the test result is unqualified.
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| CN201911107717.5A CN110703166A (en) | 2019-11-13 | 2019-11-13 | Method for testing mixture of tungsten carbide powder and cobalt powder |
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| CN201911107717.5A CN110703166A (en) | 2019-11-13 | 2019-11-13 | Method for testing mixture of tungsten carbide powder and cobalt powder |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880809A (en) * | 2010-06-09 | 2010-11-10 | 株洲肯特硬质合金有限公司 | Hard alloy for spherical tooth drill bit suitable for welding processing |
| CN102965558A (en) * | 2012-11-20 | 2013-03-13 | 福建金鑫钨业股份有限公司 | Method for industrial production of high-property ultra-fine crystal extruded bar material |
| CN104942298A (en) * | 2015-05-25 | 2015-09-30 | 上海高更高实业有限公司 | Composite cemented carbide spherical gear or pillar stud of inhomogeneous composition and structure and manufacturing method thereof |
| CN107937786A (en) * | 2017-11-28 | 2018-04-20 | 技锋精密刀具（马鞍山）有限公司 | A kind of novel hard alloy cutting tool material and its preparation process |
| CN108941548A (en) * | 2018-08-09 | 2018-12-07 | 蓬莱市超硬复合材料有限公司 | A kind of preparation process of hard alloy spherical-teeth |
-
2019
- 2019-11-13 CN CN201911107717.5A patent/CN110703166A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880809A (en) * | 2010-06-09 | 2010-11-10 | 株洲肯特硬质合金有限公司 | Hard alloy for spherical tooth drill bit suitable for welding processing |
| CN102965558A (en) * | 2012-11-20 | 2013-03-13 | 福建金鑫钨业股份有限公司 | Method for industrial production of high-property ultra-fine crystal extruded bar material |
| CN104942298A (en) * | 2015-05-25 | 2015-09-30 | 上海高更高实业有限公司 | Composite cemented carbide spherical gear or pillar stud of inhomogeneous composition and structure and manufacturing method thereof |
| CN107937786A (en) * | 2017-11-28 | 2018-04-20 | 技锋精密刀具（马鞍山）有限公司 | A kind of novel hard alloy cutting tool material and its preparation process |
| CN108941548A (en) * | 2018-08-09 | 2018-12-07 | 蓬莱市超硬复合材料有限公司 | A kind of preparation process of hard alloy spherical-teeth |
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Application publication date: 20200117 |