CN111644611B - Preparation process of novel hard alloy material to be extruded - Google Patents
Preparation process of novel hard alloy material to be extruded Download PDFInfo
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- CN111644611B CN111644611B CN202010548322.5A CN202010548322A CN111644611B CN 111644611 B CN111644611 B CN 111644611B CN 202010548322 A CN202010548322 A CN 202010548322A CN 111644611 B CN111644611 B CN 111644611B
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/108—Mixtures obtained by warm mixing
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
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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
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
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Abstract
The invention discloses a preparation process of a novel hard alloy material to be extruded, which comprises the following steps of A, mixing a full-refined material with a melting point of 50-56 DEG CSpraying and granulating the refined paraffin through a spray drying tower to prepare powdery paraffin powder with certain fluidity; step B, mixing different WC, co and Cr 3 C 2 Adding alcohol into a ball mill for grinding, and then adding the fully refined paraffin powder prepared in the step A to prepare mixed slurry; step C, adding the forming agent into a water bath, and controlling a mixer to heat and stir until the forming agent is melted; d, putting the mixed material particles in the step B into the step C, sealing and stirring, and adding n-hexane; and E, putting the mixture obtained in the step D into a plunger type extruder to obtain an extruded material. The method has strong practicability, avoids the defects of cracking and the like of products caused by concentrated dewaxing of the paraffin with the same melting point in the sintering process, and improves the processing quality; the defects of cracking and the like of an extrusion blank caused by concentrated drying and volatilization of the forming agent are avoided, and the practicability is high.
Description
Technical Field
The invention belongs to the technical field of hard alloy extruded section bar preparation, and particularly relates to a preparation process of a novel hard alloy material to be extruded.
Background
At present, domestic hard alloy forming processes mainly comprise compression molding, cold isostatic pressing, dry bag compression molding, extrusion molding and other forming processes. Compared with compression molding, isostatic pressing and dry bag pressing, the extrusion molding of the hard alloy has the advantages of high raw material utilization rate, high production efficiency, high one-time qualification rate, unlimited length of produced products, capability of processing hard alloy bars with inner cooling holes and the like. At present, about 40% of domestic bars are prepared by an extrusion forming process, and a specific process of a domestic common hard alloy extrusion forming process mainly comprises wet grinding, slurry drying, glue mixing, pre-pressing, extruding, blank drying, cutting and sintering, can meet the market demand, but high molecular compounds used in the extrusion process generally have the defects of difficult volatilization, difficult clean removal in the sintering process and the like, can bring great difficulty to the control of the subsequent hard alloy sintering carbon amount, and simultaneously other domestic hard alloy extrusion forming processes can be applied to gases with certain irritation and corrosivity, such as solvent gasoline, tetrahydronaphthalene and the like, can cause certain influence on the production operation environment, can also cause certain threat to the health of operators, and therefore, the applicability and the practicability are limited.
Disclosure of Invention
The invention aims to provide a preparation process of a novel hard alloy material to be extruded, which has strong practicability and is beneficial to improving the product quality.
The technical scheme for realizing the aim of the invention is a preparation process of a novel hard alloy material to be extruded, which comprises a spray drying tower, a ball mill and a program-controlled full-automatic Z-shaped mixer, and comprises the following steps,
step A, performing spray granulation on fully refined paraffin with the melting point of 50-56 ℃ through a spray drying tower to prepare powdery paraffin powder with certain fluidity;
step B, mixing different WC, co and Cr 3 C 2 Adding alcohol into a ball mill, grinding for 30-60 hours, adding the fully refined paraffin powder prepared in the step A after grinding, continuing grinding for 10 hours to prepare mixed slurry, and placing the mixed slurry into a spray drying tower for spray granulation to prepare mixed particles;
step C, adding the forming agent into a 300L full-automatic program control Z-shaped mixer, heating and stirring until the paraffin is completely melted;
d, putting the mixed material particles in the step B into the step C, sealing and stirring, adding n-hexane, and stirring the mixed material according to the corresponding steps;
and E, putting the mixture obtained in the step D into a plunger type extruder, and performing vacuum-pumping extrusion to obtain an extruded material.
In the step B, adding the fully refined paraffin powder according to the mass percent of 2.0-2.5%.
In the step C, the forming agent comprises the following raw materials in percentage by weight: 1.0-1.5% paraffin wax with melting point of 40-45 deg.C, 0.15-0.3% microcrystalline wax, 1.5-2.0% n-dodecane and 0.3-0.4% oleic acid.
In the step C, the heating and stirring temperature is 50-55 ℃, the stirring speed is 10-30r/min, and the stirring time is 20-30 minutes.
In the step D, the normal hexane is added in a weight percentage of 0.5-0.8%.
In the step D, the mixing and stirring process comprises the following steps:
d-1, stirring for 100-150 minutes at 65 ℃ and at a stirring speed of 30r/min to obtain a material state of slurry;
d-2, continuously stirring for 40-90 minutes at the stirring temperature of 30 ℃ and at the stirring speed of 15r/min to make the material state be dough;
and D-3, continuously stirring for 40-90 minutes at the stirring temperature of 5 ℃ and at the stirring speed of 10r/min to ensure that the material is in a powder state.
The invention has the positive effects that: the invention has strong practicability, paraffin is used as a main forming agent, the highest grade of the adopted paraffin is No. 52, and TGA thermal weight loss experiments show that the heat loss proportion of the paraffin is more than 98 percent, the residual quantity is far less than high molecular components such as cellulose or other high-melting-point paraffin, and the invention is very beneficial to the control of the carbon content of the hard alloy; the multi-step wax removal process is guaranteed, and the defects of cracking and the like of products caused by concentrated wax removal of paraffin with the same melting point in the sintering process are avoided, so that the processing quality is improved; the property of the paraffin is improved by adding a certain amount of microcrystalline wax, so that the melting point of the required high-melting-point paraffin is greatly reduced, and the good dimensional performance is ensured; the n-hexane and the n-dodecane with large boiling points difference are mixed and used, so that the step-by-step drying of the hard alloy extruded blank in the drying process is ensured, and the defects of cracking and the like of the extruded blank caused by concentrated drying and volatilization of the forming agent are avoided; through the preferential mixture that grinds, the mode of back grinding paraffin can avoid paraffin excessively to grind and the problem of the paraffin softening degeneration that brings, is favorable to improving product quality, and the practicality is strong.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic process diagram of the present invention.
Detailed Description
(example 1)
Fig. 1 shows an embodiment of the present invention, wherein fig. 1 is a schematic process diagram of the present invention.
A process for preparing the hard alloy material to be extruded includes such steps as spray drying tower, ball grinder and program-controlled full-automatic Z-shaped mixer,
step A, carrying out spray granulation on fully refined paraffin with the melting point of 50-56 ℃ by a spray drying tower to prepare powdery paraffin powder with certain fluidity; in this example, paraffin was 52# material.
Step B, mixing different WC, co and Cr 3 C 2 Adding alcohol into a ball mill, grinding for 30-60 hours, adding the fully refined paraffin powder prepared in the step A after grinding, continuing grinding for 10 hours to prepare mixed slurry, and placing the mixed slurry into a spray drying tower for spray granulation to prepare mixed particles;
step C, adding the forming agent into a 300L full-automatic program control Z-shaped mixer, heating and stirring until the paraffin is completely melted;
d, putting the mixed material particles in the step B into the step C, sealing and stirring, adding n-hexane, and stirring the mixed material according to the corresponding steps;
and E, putting the mixture obtained in the step D into a plunger type extruder, and performing vacuum-pumping extrusion to obtain an extruded material.
And in the step B, adding the fully refined paraffin powder according to the mass percent of 2.0-2.5%.
In this embodiment, in step C, the forming agent includes the following raw materials by weight: 1.0% of paraffin wax with a melting point of 40-45 ℃, 0.2% of microcrystalline wax, 2.0% of n-dodecane and 0.3% of oleic acid.
In the step C, the heating and stirring temperature is 50-55 ℃, the stirring speed is 10-30r/min, and the stirring time is 20-30 minutes.
In the step D, the adding amount of the n-hexane is 0.5% by weight.
In the step D, the step of mixing the mixture comprises the following steps:
d-1, stirring for 150 minutes at 65 ℃ and at 30r/min to obtain a material state of slurry;
d-2, continuously stirring for 60 minutes at the stirring temperature of 30 ℃ and at the stirring speed of 15r/min to make the material state be dough;
and D-3, continuously stirring for 60 minutes at the stirring temperature of 5 ℃ and at the stirring speed of 10r/min to ensure that the material is in a powder state.
In the implementation operation, the material mixing operation is completed by repeating the steps from D-1 to D-3 for two to three times.
The invention has strong practicability, paraffin is adopted as the main forming agent, the highest grade of the adopted paraffin is 52#, and TGA thermal weight loss experiments show that the heat loss proportion of the paraffin is more than 98 percent, the residual quantity is far less than high molecular components such as cellulose or other high-melting-point paraffin and the like, and the invention is very favorable for controlling the carbon content of the hard alloy; the multi-step wax removal process is guaranteed, and the defects of cracking and the like of products caused by concentrated wax removal of paraffin with the same melting point in the sintering process are avoided, so that the processing quality is improved; the property of the paraffin is improved by adding a certain amount of microcrystalline wax, so that the melting point of the required high-melting-point paraffin is greatly reduced, and the good dimensional performance is ensured; the n-hexane and the n-dodecane with large boiling points difference are mixed and used, so that the step-by-step drying of the hard alloy extruded blank in the drying process is ensured, and the defects of cracking and the like of the extruded blank caused by concentrated drying and volatilization of the forming agent are avoided; through the preferential mixture that grinds, the mode of back grinding paraffin can avoid paraffin excessively to grind and the problem of the paraffin softening degeneration that brings, is favorable to improving product quality, and the practicality is strong.
(example 2)
This example is substantially the same as example 1 except that: in the step C, the forming agent comprises the following raw materials in percentage by weight: 1.25% paraffin wax with a melting point of 40-45 ℃, 0.15% microcrystalline wax, 1.7% n-dodecane and 0.4% oleic acid.
In the step C, the heating and stirring temperature is 50-55 ℃, the stirring speed is 10-30r/min, and the stirring time is 20-30 minutes.
In the step D, the adding time of the n-hexane is 0.5 percent by weight.
In the step D, the step of mixing the mixture comprises the following steps:
d-1, stirring for 100 minutes at 65 ℃ and at a rotating speed of 30r/min to ensure that the material is in a slurry state;
d-2, continuously stirring for 40 minutes at the stirring temperature of 30 ℃ and at the stirring speed of 15r/min to make the material state be dough;
and D-3, continuing stirring for 40 minutes at the stirring temperature of 5 ℃ and at the stirring speed of 10r/min to enable the material to be powder.
In the implementation operation, the mixing operation is completed by repeating two to three times of D-1 to D-3.
(example 3)
This example is substantially the same as example 1 except that: in the step C, the forming agent comprises the following raw materials in percentage by weight: 1.0% of paraffin wax with a melting point of 40-45 ℃, 0.3% of microcrystalline wax, 1.5% of n-dodecane and 0.3% of oleic acid.
In the step C, the heating and stirring temperature is 50-55 ℃, the stirring speed is 10-30r/min, and the stirring time is 20-30 minutes.
In the step D, the adding amount of the n-hexane is 0.5% by weight.
In the step D, the mixing and stirring process comprises the following steps:
d-1, stirring for 150 minutes at 65 ℃ and at 30r/min to obtain a material state of slurry;
d-2, continuously stirring for 90 minutes at the stirring temperature of 30 ℃ and at the stirring speed of 15r/min to make the material state be dough;
and D-3, continuously stirring for 90 minutes at the stirring temperature of 5 ℃ and at the stirring speed of 10r/min to ensure that the material is in a powder state.
In the implementation operation, the mixing operation is completed by repeating two to three times of D-1 to D-3.
The standard parts used in the present embodiment can be purchased directly from the market, and the non-standard structural parts described in the specification and drawings can be obtained by processing without any doubt according to the general knowledge of the prior art, and the connection mode of the parts adopts the conventional means mature in the prior art, and the machines, parts and equipment adopt the conventional models in the prior art, so that the detailed description is not given here.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And such obvious changes and modifications as fall within the true spirit of the invention are deemed to be covered by the present invention.
Claims (1)
1. The utility model provides a novel preparation technology of extrusion material is treated to carbide, includes spray drying tower, ball mill and the full-automatic Z type blender of programmed type, its characterized in that: comprises the following steps of (a) preparing a solution,
step A, carrying out spray granulation on fully refined paraffin with the melting point of 50-56 ℃ by a spray drying tower to prepare powdery paraffin powder with certain fluidity;
step B, mixing different WC, co and Cr 3 C 2 Adding alcohol into a ball mill, grinding for 30-60 hours, adding the fully refined paraffin powder prepared in the step A after grinding, continuing grinding for 10 hours to prepare mixed slurry, and placing the mixed slurry into a spray drying tower for spray granulation to prepare mixed particles;
step C, adding the forming agent into a 300L full-automatic program control Z-shaped mixer, heating and stirring until the paraffin is completely melted;
d, putting the mixed material particles in the step B into the step C, sealing and stirring, adding n-hexane, and stirring the mixed material according to the corresponding steps;
e, putting the mixture obtained in the step D into a plunger type extruder, and vacuumizing and extruding to obtain an extruded material;
in the step B, adding the fully refined paraffin powder according to the mass percent of 2.0-2.5%;
in the step C, the forming agent comprises the following raw materials in percentage by weight: 1.0-1.5% paraffin wax with melting point of 40-45 deg.C, 0.15-0.3% microcrystalline wax, 1.5-2.0% n-dodecane and 0.3-0.4% oleic acid;
in the step C, the heating and stirring temperature is 50-55 ℃, the stirring speed is 10-30r/min, and the stirring time is 20-30 minutes;
in the step D, the normal hexane is added in an amount of 0.5 to 0.8 percent by weight;
in the step D, the mixing and stirring process comprises the following steps:
d-1, stirring for 100-150 minutes at 65 ℃ and at a stirring speed of 30r/min to obtain a material state of slurry;
d-2, continuously stirring for 40-90 minutes at the stirring temperature of 30 ℃ and at the stirring speed of 15r/min to make the material state be dough;
and D-3, continuously stirring for 40-90 minutes at the stirring temperature of 5 ℃ and at the stirring speed of 10r/min to ensure that the material is in a powder state.
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| CN202010548322.5A CN111644611B (en) | 2020-06-16 | 2020-06-16 | Preparation process of novel hard alloy material to be extruded |
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| CN202010548322.5A CN111644611B (en) | 2020-06-16 | 2020-06-16 | Preparation process of novel hard alloy material to be extruded |
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| CN101348374A (en) * | 2007-07-19 | 2009-01-21 | 日铁矿业株式会社 | Green sheet, manufacturing method thereof and slurry composition for forming green sheet |
| CN102806346A (en) * | 2012-07-16 | 2012-12-05 | 株洲同一实业有限公司 | Forming method for hard alloy anvil |
| KR20140013484A (en) * | 2012-07-24 | 2014-02-05 | 오 걸 권 | Hardmetal compositions with improved wear-resistance, and manufacturing method thereof |
| CN103614603A (en) * | 2013-12-09 | 2014-03-05 | 株洲硬质合金集团有限公司 | Hard alloy with grain size of less than 200nm and preparation method thereof |
| CN106077616B (en) * | 2016-08-10 | 2018-11-27 | 厦门金鹭特种合金有限公司 | High-dimensional hard alloy forming agent and material mixing process thereof |
| CN106735240B (en) * | 2016-12-23 | 2019-12-24 | 株洲硬质合金集团有限公司 | Preparation method of PCB bar |
| CN109295334B (en) * | 2018-09-30 | 2020-11-06 | 合肥工业大学 | Method for preparing high-performance hard alloy by taking WC-6Co composite powder as raw material |
| CN109550939A (en) * | 2018-12-28 | 2019-04-02 | 深圳市注成科技股份有限公司 | For the injection molding binder of digital cuttings and feeding preparation method |
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