CN102350501A - Reduced hot-press forming method for preparing diamond segment at low temperature and under low pressure - Google Patents
Reduced hot-press forming method for preparing diamond segment at low temperature and under low pressure Download PDFInfo
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- CN102350501A CN102350501A CN2011102822543A CN201110282254A CN102350501A CN 102350501 A CN102350501 A CN 102350501A CN 2011102822543 A CN2011102822543 A CN 2011102822543A CN 201110282254 A CN201110282254 A CN 201110282254A CN 102350501 A CN102350501 A CN 102350501A
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Abstract
The invention discloses a reduced hot-press forming method for preparing a diamond segment at low temperature and under low pressure. The reduced hot-press forming method is characterized by comprising the steps of: calculating the mass of each metal elementary substance powder and/or pre-alloyed powder as well as the volume and the mass of required diamond according to requirements in a formula of the diamond segment; and uniformly mixing the metal elementary substance powder and/or the pre-alloyed powder as well as the diamond as required in the formula, and performing mould pressing; and placing a pressed green compact into a high-temperature-resistant mould, sintering in a reducing atmospheres at first, and then performing hot-press forming to obtain the diamond segment. The reduced hot-press forming method disclosed by the invention is simple and feasible and has the following advantages and positive effects that: (1) diamond segments of various shapes and dimensions can be prepared at low temperature and under low pressure; (2) the advantages of simple preparation equipment and process, low cost and high efficiency are achieved, and the method is suitable for scale production; and (3) in a production process, the heat utilization rate is high and no waste gases are exhausted, and the production cost is reduced.
Description
Technical field
The present invention relates to a kind of preparation method of diamond block, specifically is the heat of reduction transfer moulding method that a kind of low-temp low-pressure prepares diamond block.
Background technology
Super hard abrasive diamond and CBN have the title of " industrial tooth ", and slight particles supports development of modern industry.Metal binding agent diamond tool is one of three big pillars of diamond tool; Because of the advantages such as utilization rate that it has machining accuracy height, long service life, production efficiency is high and improve material, and be widely used in industries such as machining, electronic apparatus, optical glass and gem processing, probing and exploitation, building and building materials.Present one of main method of preparation metal binding agent diamond tool is to utilize mode such as hot pressed sintering to prepare diamond block, is arranged on the matrix by certain position through welding manner envoy pieces such as high-frequency welding and laser weld again.
At present, preparing the main mode of metal-bonded diamond joint piece both at home and abroad has: traditional hot pressed sintering, high temperature pressureless sintering and HIP sintering.More or less there are some problems in these three kinds of metal-bonded diamond joint piece preparation methods:
(1) traditional hot pressed sintering is that the joint piece is carried out hot pressed sintering under the environment of atmosphere.A kind of hot pressing sintering process of preparing magnetic abrasive was disclosed June 6 calendar year 2001 like Chinese patent document number CN1297976; Its so-called hot pressing sintering method is meant iron powder, the brown alundum powder that will have magnetic; Super hard abrasives such as white alundum powder, CBN and diadust mix with the bond that makes iron powder with super-hard abrasive reliable connection under HTHP mutually; Behind the dress mould; Under the condition that does not need reducing atmosphere, carry out hot pressed sintering, a kind of technical process of cooling off, pulverize, sieving.The method is because sintering time is short; Event needs higher sintering temperature and bigger hot pressing pressure; Be prone to cause adamantine heat erosion and fragmentation; The carcass metal dust also is prone to oxidation owing to being exposed in the air, thereby produces metal matrix to problems such as durability of diamond and diamond tool reductions in service life.
(2) high temperature pressureless sintering belongs to the liquid-phase sintering mode, therefore require metallic bond that low-melting metal or alloy is arranged, and the shape-retaining ability of product is poor, and its commercial Application is restricted.
(3) HIP sintering also makes and should be restricted because its jacket complex design and manufacturing cost are high.
Summary of the invention
The object of the invention aims to provide that a kind of technology is simple, and cost of manufacture is low, and the low-temp low-pressure that efficient is high prepares the heat of reduction transfer moulding method of diamond block, to overcome weak point of the prior art.
The heat of reduction transfer moulding method for preparing diamond block by a kind of low-temp low-pressure of this purpose design; It is characterized in that: according to the requirement of diamond block prescription; Calculate the quality of each metal simple-substance powder and/or pre-alloyed powder, and required adamantine volume and quality; Get prescription required metal simple-substance powder and/or pre-alloyed powder and diamond, carry out mold pressing through after mixing; Pressed compact is packed in the high-temperature resistance die, under reducing atmosphere, carry out sintering earlier, obtain diamond block through hot forming again.
Said preparation method is:
Step 1, prepare metal simple-substance powder and/or pre-alloyed powder through atomization, reducing process, carbonyl process, electrolysis or additive method, and the diamond of choosing required model, particle diameter;
Step 2, according to the requirement of diamond block prescription, take by weighing required metal simple-substance powder and/or pre-alloyed powder by quality, and diamond, and mix with batch mixer;
Step 3, the metal simple-substance powder and/or the pre-alloyed powder that mix, and diamond is through being molded into pressed compact;
Step 4, pressed compact is packed in the high-temperature resistance die, and under the reducing atmosphere condition heat, hot pressing is carried out in pressurization again after the insulation; Pressure is 5MPa, behind the pressurize 10min;
Step 5, high-temperature resistance die is come out of the stove,, obtain required diamond block after the polishing through air-cooled or naturally cool to mould unloading below 100 ℃.
Said metal simple-substance powder is Fe powder or Ni powder or Co powder or Cu powder or other metal dusts; Said pre-alloyed powder is the alloyed powder of CuZn alloyed powder or other metals; Said adamantine model is MBD4, and particle diameter is 40/50 or 60/70.
Said batch mixer is the three-dimensional blender machine, and incorporation time is 60～120min.
The pressure of said mold pressing is 150-300MPa.
The temperature of said heat is 650-800 ℃, and temperature retention time is 40～80min, and said hot pressing pressure is 2-10MPa, and the dwell time is 10～15min.
The invention provides the heat of reduction transfer moulding method that a kind of low-temp low-pressure prepares diamond block, it is simple, and has following advantage and good effect:
(1) under low-temp low-pressure, can prepare the diamond block of various difformities and size.
(2) preparation equipment, technology are simple, and cost is low, and efficient is high, are fit to large-scale production.
(3) the production process Btu utilization is high, and non-exhaust emission reduces production costs.
Description of drawings
Fig. 1 is the X-ray diffractogram of the prepared FeNiCuZn diamond block of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
This low-temp low-pressure prepares the heat of reduction transfer moulding method of diamond block, according to the requirement of diamond block prescription, calculates the quality of each metal simple-substance powder and/or pre-alloyed powder, and required adamantine volume and quality; Get prescription required metal simple-substance powder and/or pre-alloyed powder and diamond, carry out mold pressing through after mixing; Pressed compact is packed in the high-temperature resistance die, under reducing atmosphere, carry out sintering earlier, obtain diamond block through hot forming again.
Its concrete preparation method is:
Step 1, prepare metal simple-substance powder and/or pre-alloyed powder through atomization, reducing process, carbonyl process, electrolysis or additive method, and the diamond of choosing required model, particle diameter;
Step 2, according to the requirement of diamond block prescription, take by weighing required metal simple-substance powder and/or pre-alloyed powder by quality, and diamond, and mix with batch mixer;
Step 3, the metal simple-substance powder and/or the pre-alloyed powder that mix, and diamond is through being molded into pressed compact;
Step 4, pressed compact is packed in the high-temperature resistance die, and under the reducing atmosphere condition heat, hot pressing is carried out in pressurization again after the insulation; Pressure is 5MPa, behind the pressurize 10min;
Step 5, high-temperature resistance die is come out of the stove,, obtain required diamond block after the polishing through air-cooled or naturally cool to mould unloading below 100 ℃.
The metal simple-substance powder is Fe powder or Ni powder or Co powder or Cu powder or other metal dusts; Said pre-alloyed powder is the alloyed powder of CuZn alloyed powder or other metals; Said adamantine model is MBD4, and particle diameter is 40/50 or 60/70.
Batch mixer is the three-dimensional blender machine, and incorporation time is 60～120min.
The pressure of mold pressing is 150-300MPa.
The temperature of heat is 650-800 ℃, and temperature retention time is 40～80min, and said hot pressing pressure is 2-10MPa, and the dwell time is 10～15min.
First embodiment
Make a kind of diamond concentration and be 75% FeNiCuZn diamond edging wheel joint piece.
Prescription requirement by this diamond block; Calculate each required metal simple-substance powder (being Fe powder and Ni powder), CuZn pre-alloyed powder and adamantine quality; Its mass ratio is: the CuZn prealloy powder 5～7g for preparing Ni powder 8～10g, water atomization preparation through Fe powder 12～16g, the carbonyl process of reducing process preparation; And particle diameter is diamond 2～4g of 40/50, adds 0.3～0.4g paraffin lubricant again.Above-mentioned material is put into three-dimensional blender machine batch mixing 90min.On press, use the above-mentioned material that mixes 200MPa to be pressed into pressed compact again, the pressed compact high-temperature resistance die of packing into is heated to 750 ℃ under the reducing atmosphere condition, behind the insulation 60min, begin pressurization, hot pressing pressure is 5MPa, pressurize 10min.High-temperature resistance die is come out of the stove, and process is air-cooled or naturally cool to mould unloading below 100 ℃, obtains required diamond block after the polishing, and its XRD analysis result sees Fig. 1.
The hot pressing temperature of tradition hot-press method is 800 ℃, and hot pressing pressure is 18MPa, and sintering process has small amount of exhaust gas to discharge.The present invention is than low 50 ℃ of the temperature of traditional hot-press method, and hot pressing pressure is about 1/3 of traditional hot-press method, makes that its manufacture craft is simpler, cost of manufacture is lower, is fit to the popularization of enterprise more.
Second embodiment
Make a kind of diamond concentration and be 100% FeCoCu diamond rope saw beading joint piece.
Prescription requirement by this diamond block; Calculate each required metal simple-substance powder (being Fe powder, Co powder and Cu powder) and adamantine quality; Its mass ratio is: Fe powder, the Co powder of reducing process preparation are respectively 33～38g, 12～17g; Electrolysis prepares Cu powder 20～25g; And particle diameter is diamond 7～9g of 60/70, adds 0.6～0.8g paraffin lubricant again.Above-mentioned material is put into three-dimensional blender machine batch mixing 120min.On press, use the above-mentioned material that mixes 250MPa to be pressed into pressed compact again, the pressed compact high-temperature resistance die of packing into is heated to 770 ℃ under the reducing atmosphere condition, behind the insulation 50min, begin pressurization, hot pressing pressure is 8MPa, pressurize 12min.High-temperature resistance die is come out of the stove, and process is air-cooled or naturally cool to mould unloading below 100 ℃, obtains required diamond block after the polishing
The hot pressing temperature of tradition hot-press method is 825 ℃, and hot pressing pressure is 20MPa, and sintering process has small amount of exhaust gas to discharge.The present invention is than low 55 ℃ of the temperature of traditional hot-press method, and hot pressing pressure is about 2/5 of traditional hot-press method, makes that its manufacture craft is simpler, cost of manufacture is lower, is fit to the popularization of enterprise more.
Claims (6)
1. a low-temp low-pressure prepares the heat of reduction transfer moulding method of diamond block, it is characterized in that: according to the requirement of diamond block prescription, calculate the quality of each metal simple-substance powder and/or pre-alloyed powder, and required adamantine volume and quality; Get prescription required metal simple-substance powder and/or pre-alloyed powder and diamond, carry out mold pressing through after mixing; Pressed compact is packed in the high-temperature resistance die, under reducing atmosphere, carry out sintering earlier, obtain diamond block through hot forming again.
2. prepare the heat of reduction transfer moulding method of diamond block according to the said low-temp low-pressure of claim 1, it is characterized in that preparation method is:
Step 1, prepare metal simple-substance powder and/or pre-alloyed powder through atomization, reducing process, carbonyl process or electrolysis, and the diamond of choosing required model, particle diameter;
Step 2, according to the requirement of diamond block prescription, take by weighing required metal simple-substance powder and/or pre-alloyed powder by quality, and diamond, and mix with batch mixer;
Step 3, the metal simple-substance powder and/or the pre-alloyed powder that mix, and diamond is through being molded into pressed compact;
Step 4, pressed compact is packed in the high-temperature resistance die, and under the reducing atmosphere condition heat, hot pressing is carried out in pressurization again after the insulation; Pressure is 5MPa, behind the pressurize 10min;
Step 5, high-temperature resistance die is come out of the stove,, obtain required diamond block after the polishing through air-cooled or naturally cool to mould unloading below 100 ℃.
3. the heat of reduction transfer moulding method for preparing diamond block according to the said low-temp low-pressure of claim 2 is characterized in that said metal simple-substance powder is Fe powder or Ni powder or Co powder or Cu powder or other metal dusts; Said pre-alloyed powder is the alloyed powder of CuZn alloyed powder or other metals; Said adamantine model is MBD4, and particle diameter is 40/50 or 60/70.
4. the heat of reduction transfer moulding method for preparing diamond block according to the said low-temp low-pressure of claim 2 is characterized in that said batch mixer is the three-dimensional blender machine, and incorporation time is 60～120min.
5. prepare the heat of reduction transfer moulding method of diamond block according to the said low-temp low-pressure of claim 2, the pressure that it is characterized in that said mold pressing is 150-300MPa.
6. the heat of reduction transfer moulding method for preparing diamond block according to the said low-temp low-pressure of claim 2; The temperature that it is characterized in that said heat is 650-800 ℃; Temperature retention time is 40～80min, and said hot pressing pressure is 2-10MPa, and the dwell time is 10～15min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399985A (en) * | 2014-12-18 | 2015-03-11 | 广东新劲刚新材料科技股份有限公司 | Preparation method of diamond segment |
| CN105364064A (en) * | 2015-10-28 | 2016-03-02 | 武汉万邦激光金刚石工具股份有限公司 | Metallic bond diamond block steel mold heating and molding method |
| CN111961938A (en) * | 2020-09-11 | 2020-11-20 | 成都世佳环净科技有限公司 | Application of pure iron-based matrix to preparation of diamond tool bit and preparation method of diamond tool bit |
| CN113182523A (en) * | 2021-04-15 | 2021-07-30 | 博深股份有限公司 | Method for preparing diamond cutter teeth through high-temperature press sintering |
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| CN2386409Y (en) * | 1998-06-17 | 2000-07-05 | 郑州金海威科技实业有限公司 | Hot-pressed fritting furnace with gas protection |
| US6193770B1 (en) * | 1997-04-04 | 2001-02-27 | Chien-Min Sung | Brazed diamond tools by infiltration |
| CN1297976A (en) * | 2000-12-20 | 2001-06-06 | 太原理工大学 | Hot pressing sintering process of preparing magnetic abrasive |
| CN1623951A (en) * | 2004-11-03 | 2005-06-08 | 上海大学 | Method for preparing composite material of aluminium oxide-diamond |
| CN101195258A (en) * | 2007-12-29 | 2008-06-11 | 叶根培 | Granite cutting slice and production method thereof |
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| US6193770B1 (en) * | 1997-04-04 | 2001-02-27 | Chien-Min Sung | Brazed diamond tools by infiltration |
| CN2386409Y (en) * | 1998-06-17 | 2000-07-05 | 郑州金海威科技实业有限公司 | Hot-pressed fritting furnace with gas protection |
| CN1297976A (en) * | 2000-12-20 | 2001-06-06 | 太原理工大学 | Hot pressing sintering process of preparing magnetic abrasive |
| CN1623951A (en) * | 2004-11-03 | 2005-06-08 | 上海大学 | Method for preparing composite material of aluminium oxide-diamond |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399985A (en) * | 2014-12-18 | 2015-03-11 | 广东新劲刚新材料科技股份有限公司 | Preparation method of diamond segment |
| CN105364064A (en) * | 2015-10-28 | 2016-03-02 | 武汉万邦激光金刚石工具股份有限公司 | Metallic bond diamond block steel mold heating and molding method |
| CN111961938A (en) * | 2020-09-11 | 2020-11-20 | 成都世佳环净科技有限公司 | Application of pure iron-based matrix to preparation of diamond tool bit and preparation method of diamond tool bit |
| WO2022052990A1 (en) * | 2020-09-11 | 2022-03-17 | 成都新世佳材料科技有限公司 | Method for preparing diamond tool bit from pure iron-based matrix |
| CN113182523A (en) * | 2021-04-15 | 2021-07-30 | 博深股份有限公司 | Method for preparing diamond cutter teeth through high-temperature press sintering |
| CN113182523B (en) * | 2021-04-15 | 2022-12-30 | 博深股份有限公司 | Method for preparing diamond cutter teeth through high-temperature press sintering |
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Application publication date: 20120215 |