CN111940720A - Forming agent for hard alloy extrusion rod blank and mixing process thereof - Google Patents
Forming agent for hard alloy extrusion rod blank and mixing process thereof Download PDFInfo
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- CN111940720A CN111940720A CN202010830730.XA CN202010830730A CN111940720A CN 111940720 A CN111940720 A CN 111940720A CN 202010830730 A CN202010830730 A CN 202010830730A CN 111940720 A CN111940720 A CN 111940720A
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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
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
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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
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a forming agent for a hard alloy extrusion rod blank and a mixing process thereof, wherein the forming agent comprises the following components in percentage by weight: 28-50% of paraffin, 4-6% of oleylamine, 0.5-3% of gasoline, 4-8% of soybean oil, 15-25% of oleamide, 1-9% of polyethylene wax and the balance of n-alkane. According to the invention, the polyethylene wax as the component is introduced, the proper components and the proportion are selected, the extrusion feeding is produced by mixing under the specific process conditions, and the extrusion feeding is extruded at the normal temperature, so that the strength of the extruded bar billet is obviously improved, the generation of cracks in the process of removing the forming agent of the product is effectively avoided, the processing strength of the bar billet is improved, the direct semi-processing forming of the dried extruded bar billet is realized, the production efficiency and the qualification rate are greatly improved, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of hard alloy extrusion forming, and particularly relates to a forming agent for a hard alloy extrusion rod blank and a mixing process thereof.
Background
The hard alloy is an alloy material prepared from a hard compound of refractory metal and bonding metal through a powder metallurgy process, is processed into a milling cutter, a drill bit, a reamer, a turning tool and the like due to high hardness and wear resistance, and is widely applied to industries such as molds, 3C, high-temperature alloys, woodwork and the like. At present, the pressing production mode of the hard alloy mainly comprises an extruding mode, a mould pressing mode and an isostatic pressing mode, wherein the extruding mode is widely applied by the advantages of uniform material, difficult layering, various specifications and types, capability of producing perforated pipes and the like. The extrusion material must be added with a forming agent to improve the pressing performance of the powder, however, the existing forming agent system has the problems of difficult removal, insufficient strength of the produced extrusion bar billet and the like, and the bar billet is difficult to realize semi-processing after being dried. The uneven mixing of the extrusion leads to the decrease of the pressing performance and the internal defects such as alloy holes.
In the prior art, for example, in the invention application with the application number of 201910049703.6, a forming agent for producing hard alloy is disclosed, which comprises the following raw materials in percentage by mass: 20-25% of polyacrylic resin, 8-15% of paraffin, 50-60% of organic solvent, 3-5% of cross-linking agent, 2-5% of dispersing agent and 5-8% of hydrophobic agent. The organic solvent is any one of absolute ethyl alcohol, isopropanol and xylene. The cross-linking agent is butyl acrylate or ethylene glycol dimethacrylate. The dispersing agent is polyoxyethylene ester. The hydrophobic agent is any one of stearic acid, organosilane and titanate.
The invention application with the application number of 200710035542.2 discloses a hard alloy composite forming agent and a production method and a use method thereof, wherein the hard alloy forming agent comprises the following components in percentage by mass: 20-27% of paraffin, 34-42% of SBS solution with the concentration of 10-20% of the solution and 32-44% of solvent gasoline, wherein the production method of the hard alloy forming agent comprises the following steps: firstly, melting solid paraffin into liquid, then, screening to remove solid impurities, mixing the obtained pure liquid paraffin with gasoline, uniformly stirring, then, adding SBS solution, fully stirring, uniformly mixing to obtain a forming agent solution, and preserving heat for later use.
The invention application with the application number of 201711083055.3 discloses an improved hard alloy paraffin-based extrusion molding agent which is used for an extrusion molding agent added into a mixture, the extrusion molding agent comprises a bonding component, a paraffin modifier, an active agent, a plasticizer and a solvent, wherein the bonding component comprises 2-3% of refined paraffin and 0.8-1.2% of refined paraffin by mass percentage of the mixture; the paraffin modifier comprises 0.1-0.1% of random polypropylene, 0.1-0.4% of terpene resin and 0.1-0.4% of ethylene-vinyl acetate copolymer in percentage by mass of the mixture; the active agent comprises 0.1-0.3% of isoethamine, 0.1-0.3% of stearic acid and 0.1-0.3% of oleic acid in percentage by mass of the mixture.
However, in the prior art, no forming agent for introducing polyethylene wax and other auxiliary agents into a paraffin wax system of cemented carbide has been reported.
Disclosure of Invention
Aiming at the defects in the prior art, the invention introduces new component polyethylene wax into the forming agent of the hard alloy paraffin system, selects proper components and proportion, and provides a mixing process matched with the new component polyethylene wax to produce the extrusion feed, thereby improving the extrusion pressing performance, obviously improving the strength, the forming performance and the dimensional stability of the extrusion bar billet, effectively reducing the generation of cracks in the extrusion and forming agent removing processes, and realizing the direct semi-processing of the extrusion bar billet after being dried.
The technical scheme adopted by the invention for solving the technical problem is as follows: the forming agent for the hard alloy extruded rod blank comprises the following components in percentage by weight:
the paraffin is formed by mixing paraffin with different melting points.
Further, the components of the forming agent and the composition of each component are as follows:
furthermore, the high-melting-point paraffin accounts for 10-15% of the paraffin; the high-melting-point paraffin is paraffin with a melting point of more than or equal to 70 ℃.
A mixing process of a forming agent for a hard alloy extruded rod blank mainly comprises the following steps:
step 1), premixing, heating and stirring all components in the forming agent according to a ratio to obtain a uniform composite forming agent;
step 2), mixing the composite forming agent obtained in the step 1) with hard alloy powder according to a certain proportion to obtain mixed slurry;
step 3), carrying out thermal stirring on the mixed slurry obtained in the step 2), wherein the thermal stirring temperature is 55-90 ℃;
step 4), carrying out cold stirring on the mixed slurry obtained in the step 3), wherein the cold stirring temperature is 18-40 ℃;
and 5) circulating the step 3) and the step 4) for a plurality of times to obtain the uniformly mixed extrusion feed.
Further, in the step 2), the mixing ratio of the composite forming agent to the hard alloy powder is 1: 10-1: 20.
further, in the step 3), the duration of the thermal stirring is 40-70 minutes.
Further, in the step 4), the duration time of the cold stirring is 25-40 minutes.
Further, in the step 5), the number of times of circulating the hot stirring in the step 3) and the cold stirring in the step 4) is 1-3 times.
Microcrystalline paraffin is selected as a plasticizer, the main component of the paraffin is solid alkane, and the paraffin component is a paraffin mixing component containing different melting points in a certain proportion and used for forming smooth removal and reducing the generation of pre-burning cracks.
Oleylamine is selected as an active agent, and a small amount of gasoline is used in a matching manner to improve the mixing uniformity of the forming agent in the hard alloy powder in the mixing process.
Soybean oil is selected as a plasticizer, is a light yellow viscous oily liquid at normal temperature relative to the molecular weight of 950, has no toxicity, low volatility and small mobility, and is used for improving the shape maintaining performance and the oxidation resistance of the extrusion feeding.
The selected oleamide is a lubricating component, has a relative molecular weight of 281.48, contains polar hydrophilic groups and lipophilic groups, can reduce the viscosity of the high-plasticity forming agent, simultaneously enhances the powder fluidity, reduces the friction force in the extrusion process and demoulding, and improves the extrusion efficiency and the qualification rate.
Polyethylene wax is selected as a dispersing agent, a lubricating agent and a paraffin modifier, the polyethylene wax is a low molecular weight polymer in the production process of polyethylene, the relative molecular weight is 800-10000, and the density is 0.9-0.98 g/cm3The melting point is 60-120 ℃, and the color is generally white or light yellow. The polyethylene wax can be used as a dispersing agent in the process of mixing materials to promote the components of each forming agent to be uniformly mixed with the hard alloy powder; the addition of the polyethylene wax has obvious performance on a paraffin system in the extrusion forming processThe penetration degree of the paraffin mixing component can be reduced, and the strength and dimensional performance of the extruded bar blank are improved; the polyethylene wax also has the function of a lubricant, and can effectively reduce the friction force between powder and between powder and a mould during extrusion by matching with oleamide, so that the extrusion process is stably carried out, extrusion cracks are avoided, the glossiness of the surface of an extruded rod blank can be increased, and the extrusion efficiency is improved; in the thermal degreasing process, the introduction of polyethylene wax and the adjustment of the proportion between other paraffin components avoid cracks caused by the concentrated removal of the forming agent.
The normal alkane is used as solvent and is liquid at normal temperature, so that the forming agent has strong dissolving effect on various components, is easy to remove and has less residue.
The invention has the beneficial effects that: compared with the prior art, the hard alloy extrusion forming agent and the matched mixing process thereof provided by the invention have the advantages that the polyethylene wax component is added, and the process mode of premixing, hot stirring and cold stirring is adopted, so that the mixing uniformity of the forming agent and hard alloy powder is greatly improved, and the problems of reduced pressing performance and increased alloy defects caused by uneven mixing of the forming agent are effectively solved; meanwhile, the deformation resistance of the extruded bar blank is enhanced, the processing strength of the bar blank is improved, and direct semi-processing after drying can be realized; the flow property of the forming agent is further improved, the surface quality is improved, and the risk of generating extrusion cracks is reduced; the compatibility with a forming agent system is good in the thermal degreasing process, the forming agent is stably removed, cracks in the removing process are avoided, and the product percent of pass is improved.
Detailed Description
The invention is further illustrated by the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention.
Example 1
A forming agent for a hard alloy extrusion rod blank and a mixing process thereof are disclosed, wherein the forming agent comprises the following components in percentage by weight:
the hard alloy extrusion mixing process matched with the forming agent mainly comprises the following steps:
step 1), heating each component of the forming agent respectively, weighing the components in a liquid state, and premixing the components with other components to obtain the composite forming agent, namely: weighing paraffin with the weight being 36 percent of the total weight of the forming agent, wherein the paraffin with the high melting point accounts for 6 percent of the total weight of the forming agent, gasoline with the weight being 1 percent of the total weight of the forming agent, oleylamine with the weight being 5 percent of the total weight of the forming agent, soybean oil with the weight being 6 percent of the total weight of the forming agent, oleamide with the weight being 17 percent of the total weight of the forming agent, polyethylene wax with the weight being 7 percent of the total weight of the forming agent and normal alkane with the weight being 29 percent of the total weight of the forming agent in a liquid;
step 2), mixing the premixed composite forming agent and the hard alloy powder in a ratio of 1: 12, mixing in a proportion range;
step 3), heating to above 90 ℃, stirring and mixing for 50 minutes;
step 4), cooling to below 30 ℃, stirring and mixing for 30 minutes;
and 5) repeating the step 3) and the step 4) for 3 times, and granulating to obtain the uniformly mixed extrusion feed.
Example 2
A forming agent for a hard alloy extrusion rod blank and a mixing process thereof are disclosed, wherein the forming agent comprises the following components in percentage by weight:
the hard alloy extrusion mixing process matched with the forming agent mainly comprises the following steps:
step 1), heating each component of the forming agent respectively, weighing the components in a liquid state, and premixing the components with other components to obtain the composite forming agent, namely: weighing paraffin accounting for 40 percent of the total weight of the forming agent, wherein the paraffin with a high melting point accounts for 9 percent of the total weight of the forming agent, gasoline accounting for 1 percent of the total weight of the forming agent, oleylamine accounting for 4 percent of the total weight of the forming agent, soybean oil accounting for 4 percent of the total weight of the forming agent, oleamide accounting for 22 percent of the total weight of the forming agent, polyethylene wax accounting for 5 percent of the total weight of the forming agent and normal alkane accounting for 24 percent of the total weight of the forming agent in a liquid state, adding the weighed materials into the same container, mixing;
step 2), mixing the premixed composite forming agent and the hard alloy powder in a ratio of 1: 13 in the proportion range;
step 3), heating to above 85 ℃, stirring and mixing for 40 minutes;
step 4), cooling to below 30 ℃, stirring and mixing for 30 minutes;
and 5) repeating the step 3) and the step 4) for 3 times, and granulating to obtain the uniformly mixed extrusion feed.
The rod blanks obtained by extrusion, feeding and extruding produced by the above examples 1 and 2 have enough processing strength after being rapidly dried at low temperature, and can be directly cut to obtain required lengths; the bar stock can be further subjected to the following semi-processing according to the requirements:
compared with the process route that the alloy product can be processed after presintering in a conventional forming agent system, the process shortens the production period, greatly improves the production efficiency, reduces the processing difficulty and the production cost, and has great practical significance.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (8)
1. The forming agent for the hard alloy extruded rod blank is characterized by comprising the following components in percentage by weight:
the paraffin is formed by mixing paraffin with different melting points.
2. The forming agent for cemented carbide extruded billets as claimed in claim 1, wherein: the forming agent comprises the following components:
3. the forming agent for cemented carbide extruded billets as claimed in claim 1, wherein: in the paraffin, the high-melting-point paraffin accounts for 10-15%; the high-melting-point paraffin is paraffin with a melting point of more than or equal to 70 ℃.
4. A mixing process of the molding agent for cemented carbide extrusion billets as set forth in any one of claims 1 to 3, characterized in that the mixing process mainly comprises the steps of:
step 1), premixing, heating and stirring all components in the forming agent according to a ratio to obtain a uniform composite forming agent;
step 2), mixing the composite forming agent obtained in the step 1) with hard alloy powder according to a certain proportion to obtain mixed slurry;
step 3), carrying out thermal stirring on the mixed slurry obtained in the step 2), wherein the thermal stirring temperature is 55-90 ℃;
step 4), carrying out cold stirring on the mixed slurry obtained in the step 3), wherein the cold stirring temperature is 18-40 ℃;
and 5) circulating the step 3) and the step 4) for a plurality of times to obtain the uniformly mixed extrusion feed.
5. The mixing process of a molding agent for cemented carbide extruded rods according to claim 4, wherein: in the step 2), the mixing ratio of the composite forming agent to the hard alloy powder is 1: 10-1: 20.
6. the mixing process of a molding agent for cemented carbide extruded rods according to claim 4, wherein: in the step 3), the duration of the thermal stirring is 40-70 minutes.
7. The mixing process of a molding agent for cemented carbide extruded rods according to claim 4, wherein: in the step 4), the duration time of the cold stirring is 25-40 minutes.
8. The mixing process of a molding agent for cemented carbide extruded rods according to claim 4, wherein: in the step 5), the number of times of circulating the hot stirring in the step 3) and the cold stirring in the step 4) is 1-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010830730.XA CN111940720A (en) | 2020-08-18 | 2020-08-18 | Forming agent for hard alloy extrusion rod blank and mixing process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010830730.XA CN111940720A (en) | 2020-08-18 | 2020-08-18 | Forming agent for hard alloy extrusion rod blank and mixing process thereof |
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| CN111940720A true CN111940720A (en) | 2020-11-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010076465A (en) * | 2000-01-26 | 2001-08-16 | 이용호 | Magnetic wedge fabrication method for induction motors via tape casting process |
| CN102151832A (en) * | 2011-02-28 | 2011-08-17 | 中南大学 | Extrusion forming agent and preparation and use thereof |
| CN106077616A (en) * | 2016-08-10 | 2016-11-09 | 厦门金鹭特种合金有限公司 | A kind of higher-dimension shape hard alloy forming agent and spice technique thereof |
| CN106853522A (en) * | 2016-12-26 | 2017-06-16 | 南昌硬质合金有限责任公司 | A kind of preparation method of hard alloy novel extrusion feeding |
| CN111468735A (en) * | 2020-04-16 | 2020-07-31 | 上海钨睿新材料科技有限公司 | Hard alloy extrusion molding agent based on paraffin base and extrusion feeding preparation process thereof |
-
2020
- 2020-08-18 CN CN202010830730.XA patent/CN111940720A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010076465A (en) * | 2000-01-26 | 2001-08-16 | 이용호 | Magnetic wedge fabrication method for induction motors via tape casting process |
| CN102151832A (en) * | 2011-02-28 | 2011-08-17 | 中南大学 | Extrusion forming agent and preparation and use thereof |
| CN106077616A (en) * | 2016-08-10 | 2016-11-09 | 厦门金鹭特种合金有限公司 | A kind of higher-dimension shape hard alloy forming agent and spice technique thereof |
| CN106853522A (en) * | 2016-12-26 | 2017-06-16 | 南昌硬质合金有限责任公司 | A kind of preparation method of hard alloy novel extrusion feeding |
| CN111468735A (en) * | 2020-04-16 | 2020-07-31 | 上海钨睿新材料科技有限公司 | Hard alloy extrusion molding agent based on paraffin base and extrusion feeding preparation process thereof |
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