CN103752640A - Manufacturing method of extrusion punching head of diamond film piston pin - Google Patents
Manufacturing method of extrusion punching head of diamond film piston pin Download PDFInfo
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- CN103752640A CN103752640A CN201310736146.8A CN201310736146A CN103752640A CN 103752640 A CN103752640 A CN 103752640A CN 201310736146 A CN201310736146 A CN 201310736146A CN 103752640 A CN103752640 A CN 103752640A
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Abstract
The invention discloses a manufacturing method of an extrusion punching head of a diamond film piston pin. The method comprises the following steps: cleaning and drying; pretreating; polishing and grinding a workpiece; nucleating by using hot filament CVD (Chemical Vapor Deposition) deposition equipment; growing; and depositing a coated diamond film. As compared with a common high-speed tool steel punching head, the diamond film coated extrusion punching head manufactured by the manufacturing method disclosed by the invention has the advantage that the service life and the efficiency can be prolonged and improved by 8 to 10 times; compared with a NCr-coated hard alloy punching head, the diamond film coated extrusion punching head has the advantage that the service life and the efficiency can be prolonged and improved by 5 to 8 times.
Description
Technical field
The present invention relates to a kind of technique at machining cold impact extrusion press tool face coat diamond film, relate in particular to a kind of preparation method of diamond film piston pin extrusion punch, also can be widely used in other impact extrusion and press drift processing.
Background technology
Piston pin of vehicle is the strength member of internal combustion engine.Manufacturing piston pin has several different methods, with solid bar cold extrusion perforation base, is wherein the main technique method that industrialization is produced in enormous quantities.
Piston pin of vehicle is the long garden of heavy wall barrel part.Simple shape, but cold extrusion difficulty of processing is quite large really.Conventionally, then heavy wall garden barrel part can rush the end with backward extrusion deep hole processed and make.But practical experience and theoretical calculating are learnt, the degree of depth of a backward extrusion drilling of mild steel and diameter ratio should be less than 2.5-3.0. when the endoporus aspect ratio of backward extrusion surpasses 2.5, the backward extrusion drift of common carbide alloy unstability and fractureing very easily under huge extrusion stress effect.
In the automatic cold shaping machine extrusion process of high-speed multi-station, a large amount of distortion heats of workpiece conduct to mould (drift), cause drift temperature sharply to rise, simultaneously when deep extrusion, being extruded material significantly flows, the surface of the work lubricating film contacting with drift extremely extends, and is easy to lose isolation and lubricant effect and finally causes common hard alloy punch head and workpiece to produce serious adhesion and burn.
In order to improve work efficiency, what impact extrusion pressure piston pin of vehicle enterprise typically used is the automatic cold shaping machine of multistation completing to workpiece from reel steel, this equipment is the Large Machining Center of continuous operation, if hold up work for lack of material completely because the frequent adhesion of drift, burn and fracture will cause production line, cause huge economic loss to enterprise.
Summary of the invention
Technical problem to be solved by this invention is: a kind of high efficiency technique at piston pin extrusion punch face coat diamond film is provided.That is, in the impact extrusion of hard alloy punch head, press working position coating diamond film 8-10 μ m, thereby significantly improve operating efficiency in the service life that drift working position coating diamond film just can increase substantially drift.This is that its thermal conductivity can reach 2000W/ (m.k) because diamond film has good heat dispersion, can well solve the heat dissipation problem of the large heat flow density of short space in drift and workpiece extruding extension process, avoids drift and workpiece adhesion and burn; Simultaneously, diamond film has extra high hardness, the microhardness of diamond film can reach 9000-10000HV, and diamond film rubs that to wipe be that number≤0.1 μ can overcome workpiece in extruding and the large drag forces and the extrusion stress that extend drift is produced, thereby increases work efficiency.
Solve the technology of the present invention problem and adopt following steps:
The first step: cleaning-drying: clean and remove surface of the work antirust oil with absolute ether (alcohol), then the workpiece of cleaning is put into thermostatic drying chamber, at 1min inner drying, temperature is controlled at 50-60 ℃;
Second step: pretreatment: carry out " pretreatment " 50-60min with preprocessing solution etching surface of the work in supersonic wave cleaning machine, in order to increase the nucleation density of diamond film deposition;
Described preprocessing solution is: use Na
2feO
4, potassium hydroxide, water is formulated by weight the ratio of 1:2:20;
The 3rd step: throw and grind workpiece: throw and grind the pretreated workpiece of upper step with W6 diadust, make matrix form frame foundation before coating diamond film;
The 4th step: operating equipment: the workpiece that upper step is dried is placed on heated filament CVD depositing device chip bench, and it is 5-6Pa that heated filament CVD depositing device is evacuated to thermocouple meter registration, and 30-40min, is progressively heated to 2400-2600 ℃ by heated filament; C, H are respectively to 1-2Pa in input, to heated filament and cavity and workpiece heating;
The 5th step: forming core stage: after upper step has heated, heated filament is progressively heated to 2800 ℃, C, H are respectively to 1-2Pa in input, regulate vacuum pressure to 100KPa, nucleated time 50 min;
The 6th step: growth, depositional phase: after above walking forming core and completing, heated filament is progressively heated to 3000 ℃, inputs H, CH simultaneously
4-H
2the concentration formation of 1:1:1 by volume mixes source of the gas input cavity chamber with Ar, and workpiece is added to back bias voltage 4A, regulates vacuum pressure to 110KPa, deposition 8-10h, and diamond film deposition is complete.
The existing heated filament CVD of process using of the present invention depositing device carrys out depositing diamond film, because heated filament CVD depositing device is prior art, so be not described in detail here.
The good effect of technique of the present invention is: the present invention possesses technical indicator and feature (1) hardness: Vickers hardness number is about HV9000-10000, and this is that ordinary rigid alloy drift does not reach; (2) diamond film coating layer pattern is continuous, even, fine and close; (3) excellent radiation performance: testpieces surface maximum temperature difference △ Tm=△ T1-△ T2.
According to test data, can be calculated, during heat flow density 20W/c ㎡, copper surface maximum temperature difference is 28.66 ℃, and diamond is 14.06 ℃.According under the identical working condition of the definition of thermal conductivity, CVD diamond film is in the plane of transmitting along heat (ignoring heat along the variation on testpieces thickness direction), and thermograde should be much smaller than copper.Evidence, under identical working condition, in diamond face, thermograde is little, and temperature distribution evenness is good, and surperficial maximum temperature difference is only half of copper.
As can be seen here, use diamond film coating extruding drift of the present invention than using common high-speed tool steel drift service life and efficiency can improve 8-10 doubly; Than the hard alloy punch head service life of NCr coating and efficiency improving 5-8 doubly.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
The specific embodiment
For further describing the present invention, below with specific embodiment, technical scheme of the present invention is described, but protection scope of the present invention is not limited only to this.
Embodiment 1
Piston pin extrusion punch: diameter 20, overall length 140mm, effective active length 90mm, drift press section bit length 18 mm wherein, material: YG8 whole hard alloy.
As shown in Figure 1, a kind of preparation method of diamond film piston pin extrusion punch, comprises the steps:
1, by drawing dimensional accuracy, grind YG8 whole hard alloy piston pin extrusion punch (hereinafter to be referred as " workpiece ");
2, with absolute ether (alcohol), clean and remove surface of the work antirust oil, then the workpiece of cleaning is entered to thermostatic drying chamber, at 1min inner drying, temperature is controlled at 50 ℃;
3, use Na
2feO
4, potassium hydroxide, water is by weight the formulated preprocessing solution of ratio of 1:2:20;
4, the active length 90mm position of workpiece is inserted in preprocessing solution, be positioned in ultrasonic washing instrument, vibration 50min;
5, at the position of preprocessing solution vibration processing, brush W5 diadust, with 0 ﹟ diamond tissue paper, throw and grind;
6, by the orientation of heated filament frame, put workpiece and (according to the number of the arrangement of heated filament frame, can put many rows, many.Row and row, be divided into 30mm between part and part);
7, press heated filament and workpiece end face apart from 30mm, arrange heated filament with the requirement of lateral distance 30mm;
8, close depositing device bell jar or chamber door;
9, being evacuated to thermocouple meter registration is 5Pa, 30min;
10, adjustment voltage V, electric current A heated filament are progressively heated to 2800 ℃; Inputting C, H, Ar will determine according to the volume size of apparatus cavity to the capacity of 1.5Pa(gas input respectively simultaneously) regulate vacuum pressure to 100KPa, to workpiece coat side forming core, nucleated time 50 min;
11, regulate heater voltage V, electric current A to be progressively heated to 3000 ℃ and to input H, CH simultaneously
4-H
2the concentration formation of 1:1:1 by volume mixes source of the gas input cavity chamber (capacity of gas input will determine according to the volume size of apparatus cavity) workpiece is added to back bias voltage 4A with Ar, regulates vacuum pressure to 110KPa, deposits 8h, and deposition of diamond thin films is complete.
Embodiment 2
Piston pin extrusion punch: diameter 18, overall length 120mm, effective active length 70mm, drift press section bit length 18 mm wherein, material: YG8 whole hard alloy.
The step of making diamond film piston pin extrusion punch is as follows:
1, by drawing dimensional accuracy, grind YG8 whole hard alloy piston pin extrusion punch (hereinafter to be referred as " workpiece ");
2, with absolute ether (alcohol), clean and remove surface of the work antirust oil, then the workpiece of cleaning is entered to thermostatic drying chamber, at 1min inner drying, temperature is controlled at 60 ℃;
3, use Na
2feO
4, potassium hydroxide, water is by weight the formulated preprocessing solution of ratio of 1:2:20;
4, the active length 90mm position of workpiece is inserted in preprocessing solution, be positioned in ultrasonic washing instrument, vibration 60min;
5, at the position of preprocessing solution vibration processing, brush W5 diadust, with 0 ﹟ diamond tissue paper, throw and grind;
6, by the orientation of heated filament frame, put workpiece and (according to the number of the arrangement of heated filament frame, can put many rows, many.Row and row, be divided into 35mm between part and part);
7, press heated filament and workpiece end face apart from 30mm, arrange heated filament with the requirement of lateral distance 30mm;
8, close depositing device bell jar or chamber door;
9, being evacuated to thermocouple meter registration is 6Pa, 40min;
10, adjustment voltage V, electric current A tungsten filament are progressively heated to 2800 ℃; Inputting C, H, Ar will determine according to the volume size of apparatus cavity to the capacity of 2Pa(gas input respectively simultaneously) regulate vacuum pressure to 100KPa, to workpiece coat side forming core, nucleated time 50 min;
11, regulate tungsten filament voltage V, electric current A to be progressively heated to 3000 ℃ and to input H, CH simultaneously
4-H
2the concentration formation of 1:1:1 by volume mixes source of the gas input cavity chamber (capacity of gas input will determine according to the volume size of apparatus cavity) workpiece is added to back bias voltage 4A with Ar, regulates vacuum pressure to 110KPa, deposits 10h, and deposition of diamond thin films is complete.
Claims (1)
1. a preparation method for diamond film piston pin extrusion punch, is characterized in that comprising the steps:
The first step: cleaning-drying: clean and remove surface of the work antirust oil with an anhydrous ether, then the workpiece of cleaning is put into thermostatic drying chamber, at 1min inner drying, temperature is controlled at 50-60 ℃;
Second step: pretreatment: carry out " pretreatment " 50-60min with preprocessing solution etching surface of the work in supersonic wave cleaning machine, dry, in order to increase the nucleation density of diamond film deposition;
Described preprocessing solution is: use Na
2feO
4, potassium hydroxide, water is formulated by weight the ratio of 1:2:20;
The 3rd step: throw and grind workpiece: throw and grind the pretreated workpiece of upper step with W6 diadust, make matrix form frame foundation before coating diamond film;
The 4th step: operating equipment: the workpiece that upper step is dried is placed on heated filament CVD depositing device chip bench, and it is 5-6Pa that heated filament CVD depositing device is evacuated to thermocouple meter registration, and 30-40min, is progressively heated to 2400-2600 ℃ by heated filament; C, H are respectively to 1-2Pa in input, to heated filament and cavity and workpiece heating;
The 5th step: forming core stage: after upper step has heated, heated filament is progressively heated to 2800 ℃, C, H are respectively to 1-2Pa in input, regulate vacuum pressure to 100KPa, nucleated time 50 min;
The 6th step: growth, depositional phase: after above walking forming core and completing, heated filament is progressively heated to 3000 ℃, inputs H, CH simultaneously
4-H
2the concentration formation of 1:1:1 by volume mixes source of the gas input cavity chamber with Ar, and workpiece is added to back bias voltage 4A, regulates vacuum pressure to 110KPa, deposition 8-10h, and diamond film deposition is complete.
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| CN201310736146.8A CN103752640B (en) | 2013-12-29 | 2013-12-29 | A kind of production method of diamond film piston pin extrusion punch |
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| CN103752640B CN103752640B (en) | 2018-10-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107282677A (en) * | 2017-05-25 | 2017-10-24 | 爱康企业集团(上海)有限公司 | A kind of tube extrusion mouth mold with film plating layer and preparation method thereof |
| CN110468385A (en) * | 2018-05-11 | 2019-11-19 | 深圳先进技术研究院 | Micro-Nano Diamond Com-posite coating, preparation method and application, cold extruding mold and punching head and mold |
| CN114379141A (en) * | 2021-12-14 | 2022-04-22 | 上海现代制药股份有限公司 | Sticking-proof punch and black-wiping-proof punch of tablet press and application thereof |
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| CN1087132A (en) * | 1993-09-03 | 1994-05-25 | 国家建筑材料工业局人工晶体研究所 | The diamond film and the method for making thereof that are used for wortle |
| CN1095007A (en) * | 1993-05-11 | 1994-11-16 | 中南工业大学 | The method for producing diamond tool that contains the surface metallised ceramic phase |
| CN1106470A (en) * | 1994-07-15 | 1995-08-09 | 郑鲁生 | Quick growth method of artificial diamond film |
| US6342195B1 (en) * | 1993-10-01 | 2002-01-29 | The Penn State Research Foundation | Method for synthesizing solids such as diamond and products produced thereby |
| CN101718652A (en) * | 2009-11-25 | 2010-06-02 | 南京航空航天大学 | Method for producing ultrahard pressure head |
| CN102601151A (en) * | 2012-03-21 | 2012-07-25 | 南京工业职业技术学院 | Method for manufacturing precision combined dies by involute spline open extrusion |
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| CN1095007A (en) * | 1993-05-11 | 1994-11-16 | 中南工业大学 | The method for producing diamond tool that contains the surface metallised ceramic phase |
| CN1087132A (en) * | 1993-09-03 | 1994-05-25 | 国家建筑材料工业局人工晶体研究所 | The diamond film and the method for making thereof that are used for wortle |
| US6342195B1 (en) * | 1993-10-01 | 2002-01-29 | The Penn State Research Foundation | Method for synthesizing solids such as diamond and products produced thereby |
| CN1106470A (en) * | 1994-07-15 | 1995-08-09 | 郑鲁生 | Quick growth method of artificial diamond film |
| CN101718652A (en) * | 2009-11-25 | 2010-06-02 | 南京航空航天大学 | Method for producing ultrahard pressure head |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107282677A (en) * | 2017-05-25 | 2017-10-24 | 爱康企业集团(上海)有限公司 | A kind of tube extrusion mouth mold with film plating layer and preparation method thereof |
| CN110468385A (en) * | 2018-05-11 | 2019-11-19 | 深圳先进技术研究院 | Micro-Nano Diamond Com-posite coating, preparation method and application, cold extruding mold and punching head and mold |
| CN114379141A (en) * | 2021-12-14 | 2022-04-22 | 上海现代制药股份有限公司 | Sticking-proof punch and black-wiping-proof punch of tablet press and application thereof |
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| CN103752640B (en) | 2018-10-12 |
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| CB03 | Change of inventor or designer information |
Inventor after: Chen Yuanda Inventor after: Yang Zhongkai Inventor after: Wang Shengyun Inventor after: He Jing Inventor after: Yang Yi Inventor after: Shen Jun Inventor before: Chen Yuanda Inventor before: Wang Shengyun |
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Effective date of registration: 20170718 Address after: 430040 No. 999, future city, East Lake New Technology Development Zone, Hubei, Wuhan Applicant after: WUHAN CENTURY ZHONGHANG SUPERPOWER DIAMOND FILM HIGH-TECH CO., LTD. Address before: Changde Hunan City Industrial Park 415200 Anfu county of Linli Province Applicant before: HUNAN ZHONGHANG SUPER DIAMOND FILM HIGH-TECH CO., LTD. |
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