CN101817080A - Method for manufacturing hard alloy ball - Google Patents
Method for manufacturing hard alloy ball Download PDFInfo
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- CN101817080A CN101817080A CN 201010139960 CN201010139960A CN101817080A CN 101817080 A CN101817080 A CN 101817080A CN 201010139960 CN201010139960 CN 201010139960 CN 201010139960 A CN201010139960 A CN 201010139960A CN 101817080 A CN101817080 A CN 101817080A
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Abstract
The invention discloses a method for manufacturing a hard alloy ball, and solves the problem of low production efficiency, bad product quality and incapability of manufacturing qualified large-diameter products in a conventional manufacturing method. The method comprises the following steps of: (1) preparing an elastic rubber sphere mold, namely, respectively pouring an upper hollow hemispherical mold and a lower hollow hemispherical mold by taking rubber as a raw material and taking a hemisphere as a mold core, wherein an upper hemispherical mold is provided with a charging hole and the upper hemispherical mold and a lower hemispherical mold are respectively provided with a convex head and a concave groove which are matched with each other; demolding after plasticizing to manufacture the upper hemispherical mold and the lower hemispherical mold; and preparing an end cover which matches the charging hole of the upper hemisphere mold; (2) assembling the upper hemispherical mold and the lower hemispherical mold into a sphere mold; charging a mixed material from the charging hole and covering the end cover; (3) respectively filling the charged sphere mold into a plastic bag and converging the bag opening with a thin rope; hanging the thin rope on a bracket so that the plastic bag filled with the sphere mold is hung on the bracket; and demolding after placing the bracket into a cold isostatic press cylinder and compacting the sphere mold by pressurizing; (4) finishing the surface of a demolded alloy ball by using a turning tool; and (5) placing the alloy ball of which the surface is finished in a sintering furnace for sintering.
Description
Technical field:
The present invention is relevant with the method for making spherical workpiece with powder metallurgic method.
Background technology:
Produce spherical alloy product with powder metallurgy process, its traditional method has following two kinds:
Method one: use hydraulic press or punching machine punching block to be shaped, powder is compacting balling-up base in the ball mould, places the sintering furnace sintering to make spherical artefact the ball base then.Its ball mould adopts two hemisphere punching blocks usually.Adopting this technology to prepare alloying pellet has the following disadvantages: (1) forming efficiency is low; (2) the ball base behind the two half steel ball contour formings of employing all has protruding endless belt in the middle of it, causes difficulty for fine finishining subsequently; (3) forming ball base density unevenness spares.This be because the mould die wall to due to the frictional resistance of powder, when the powder material prolonged the compression aspect motion, pressure constantly incurred loss, and makes that the density of ball base core is minimum.
Method two: use polyethylene to be raw material, stainless steel ball is a core rod, pours into the mould that the 30-100 chamber is connected as one, and once suppresses 30～100 ball bases with cold isostatic press, places the sintering furnace sintering to make spherical artefact the ball base then.Adopt the weak point of this preparation alloying pellet: (1) polyethylene intensity is low, and formability is poor; (2) formed thereby alloying pellet base out-of-roundness relatively poor (≤5%), subsequent fine processing cost height; (3) it is little to produce alloying pellet finished size scope, and can produce diameter is φ 5～φ 30mm.Because the structures shape of the material of ball mould and ball film can not production large scale alloying pellet, otherwise it is poor to be shaped, and is difficult to the demoulding.
Summary of the invention:
The object of the present invention is to provide a kind of production efficiency height, alloying pellet circularity is good and the manufacture method of the sintered alloy balls that the forming dimension scope is big.
The present invention is achieved in that
The manufacture method of a kind of sintered carbide ball of the present invention, its step is as follows:
(1) preparation elastic caoutchouc ball mould: with rubber is raw material, with hemisphere is core rod, pour into a mould upper and lower hollow hemisphere mould respectively, the episphere mould has charging door, upper and lower hemisphere mould has plush copper and the groove that matches respectively, upper and lower hemisphere film is made in mold demoulding after plastifying, the end cap that preparation cooperates with episphere mould charging door
(2) upper and lower hemisphere module is dressed up the ball mould, from pack into compound and cover end cap of charging door,
(3) the ball mould after will feeding is respectively charged into polybag with cord bundle mouth, and cord is hung on the support, makes the polybag of dress ball mould be suspended to support, and support is put into the demoulding after the cold isostatic press cylinder pressurization compacting,
(4) with the lathe tool refacing of the alloying pellet after the demoulding,
(5) alloying pellet after the surfacing is placed the sintering furnace sintering.
Used lathe tool is annular lathe tool in the step 4, and lathe tool is a cylindrical shape, and the one end is annular cutting edge, and the diameter of annular cutting edge is less than the diameter of alloying pellet.
Support is the vertical barrel type steel bracket that some horizontal loops and vertical rod constitute, and the space between the horizontal loops is hung with the polybag of dress ball mould.
Ball mould after will assembling in the step 2 places some grooves of vibration feeding machine, and each groove is fixed a ball film, opens vibration switch, and compound enters in the ball mould automatically, after waiting to be full of, stops vibrations.
Compare with traditional powder metallurgy ball making method, the present invention has following advantage:
(1) owing to adopt rubber pattern and isostatic cool pressing, press shape ball base out-of-roundness little, out-of-roundness≤1.5%.Isostatic cool pressing can not make the two hemispheres intermode produce the endless belt of projection, reduces later stage fine finishining amount.
(2) because ball mould intensity height independently places polybag to hang on the support, be independent of each other, and reduce the influence of gravity ball moding shape.It is big to produce the alloying pellet size range, but maximum production size is determined by the cold isostatic press diameter of cylinder.
(3) the alloying pellet base density height of ball mould cold isostatic compaction, and evenly, defectives such as goods flawless, yield rate height.
(4) once suppress 10-50 elastic caoutchouc ball mould, because the ball film is made of two hemispheres, the demoulding is easy, the production efficiency height.
(5) owing to the annular lathe tool of later stage fine finishining, working (machining) efficiency height, precision height.Out-of-roundness≤0.5% of finishing ball base.
Description of drawings:
Fig. 1 is the upper mold section structure chart.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the female die structure chart.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 is ball module assembling structure figure.
Fig. 6 is the support erection drawing.
Fig. 7 is annular lathe tool structure chart.
The specific embodiment:
Concrete technological process is:
The preparation of elastic caoutchouc ball mould---craft or mechanical oscillation charging---isostatic cool pressing compacting shaping---finishing---sintering.Existing division is as follows:
(1) preparation of elastic caoutchouc ball mould
Make ball mould punching block, be respectively end cap punching block, episphere mould punching block and lower semisphere mould punching block, the punching block size is calculated according to the size of the finished product alloying pellet of required preparation and is decided.With butadiene-styrene rubber is raw material, castable, and the plasticizing back demoulding gets final product, and the ball mould is as shown in Figure 5.Elastic caoutchouc ball mould is made up of end cap, episphere mould and lower semisphere mould, and upper and lower hemisphere intermode is fixed with the interlock of concave, convex rubber button.
(2) charging
Upper and lower hemisphere mould is closed up fastening, pour powder into from end caps, constantly vibration shakes up, and fills the bonnet upper end cover, puts the sealing bag sealing.Or the ball mould is placed the groove of vibration feeding machine, and fixing (groove is fixed a ball mould, can feed to a plurality of ball moulds simultaneously), open vibration switch, compound enters in the ball mould automatically, after waiting to be full of, stop vibrations, cover and put sealing bag sealing, about 1～3 minute of charge time behind the end cap.Sealing bag is suspended on the steel bracket with cord.
(3) the isostatic cool pressing compacting is shaped
The steel bracket that hangs elastic caoutchouc ball mould is placed the cold isostatic press compacting of pressurizeing, and moulding pressure is 60-70MPa.Can once suppress 10-50 elastic caoutchouc ball mould, decide on the cold isostatic press model.Elastic caoutchouc ball mould is taken out in release after the compacting, and the ball base of compacting is taken out from upper and lower hemisphere intermode, promptly obtains the ball base that suppresses.
(4) finishing
With the ball base that suppresses, clean out the concavo-convex or sizing of surface local with annular lathe tool, make ball base any surface finish.Annular lathe tool pattern as shown in Figure 7, lathe tool cutting edge diameter is decided on ball base diameter, and is more smaller than ball base diameter.
(5) sintering
Place hydrogen sintering furnace or vacuum sintering furnace to carry out sintering the ball base.Its technological parameter is 1350～1500 ℃ * 1.5-3hr (the ball base goods on the different sizes of different components is decided).
Adopt the method for present embodiment to prepare three batches of alloying pellets, the alloy composition of three batches of alloying pellets, product size require as shown in table 1.At first calculate and prepare the elastic caoutchouc ball mould of three batches of suitable dimensions according to the goods diameter, by hand or the vibration charger compound is packed in the ball mould, good seal is placed on compacting in the cold isostatic press, with annular lathe tool finishing, is carrying out sintering acquisition goods after the compacting demoulding.Isostatic cool pressing pressure and sintering parameter are as shown in table 2 during compacting.Optional respectively 50 ball bases are surveyed its substance, diameter and out-of-roundness after the compacting demoulding and the finishing, and its result lists table 3 in.
The composition of table 1 embodiment alloying pellet, product size requirement
| Lot number | Alloying pellet chemical analysis (wt%) | Finished ball intended diameter (mm) |
| ??1 | ??WC?94％?Co?6％ | ??φ28 |
| ??2 | ??WC?94％?Ni?6％ | ??φ56 |
| ??3 | ??WC?58％?Co?7％?Ni?7％?Ti?28％ | ??φ79 |
Table 2 embodiment ball mould internal diameter, isostatic cool pressing pressure and sintering parameter
Table 3 embodiment compacting ball base, finishing ball base state parameter and finished ball purposes
Claims (4)
1. the manufacture method of a sintered carbide ball, its step is as follows:
(1) preparation elastic caoutchouc ball mould: with rubber is raw material, with hemisphere is core rod, pour into a mould upper and lower hollow hemisphere mould respectively, the episphere mould has charging door, upper and lower hemisphere mould has plush copper and the groove that matches respectively, upper and lower hemisphere film is made in mold demoulding after plastifying, the end cap that preparation cooperates with episphere mould charging door
(2) upper and lower hemisphere module is dressed up the ball mould, from pack into compound and cover end cap of charging door,
(3) the ball mould after will feeding is respectively charged into polybag with cord bundle mouth, and cord is hung on the support, makes the polybag of dress ball mould be suspended to support, and support is put into the demoulding after the cold isostatic press cylinder pressurization compacting,
(4) with the lathe tool refacing of the alloying pellet after the demoulding,
(5) alloying pellet after the surfacing is placed the sintering furnace sintering.
2. method according to claim 1 is characterized in that lathe tool used in the step (4) is annular lathe tool, and lathe tool is a cylindrical shape, and the one end is annular cutting edge, and the diameter of annular cutting edge is less than the diameter of alloying pellet.
3. method according to claim 1 is characterized in that support is the vertical barrel type steel bracket that some horizontal loops and vertical rod constitute, and the space between the horizontal loops is hung with the polybag of dress ball mould.
4. method according to claim 1, the ball mould after it is characterized in that will assembling in the step (2) places some grooves of vibration feeding machine, and each groove is fixed a ball film, open vibration switch, compound enters in the ball mould automatically, after waiting to be full of, stops vibrations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101399608A CN101817080B (en) | 2010-04-06 | 2010-04-06 | Method for manufacturing hard alloy ball |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101399608A CN101817080B (en) | 2010-04-06 | 2010-04-06 | Method for manufacturing hard alloy ball |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101817080A true CN101817080A (en) | 2010-09-01 |
| CN101817080B CN101817080B (en) | 2012-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101399608A Expired - Fee Related CN101817080B (en) | 2010-04-06 | 2010-04-06 | Method for manufacturing hard alloy ball |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495728A (en) * | 2013-10-14 | 2014-01-08 | 自贡长城硬面材料有限公司 | Pressing method of hard alloy balls |
| CN104493161A (en) * | 2015-01-19 | 2015-04-08 | 四川科力特硬质合金股份有限公司 | Carburization method for hard alloy in vacuum sintering furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163808A (en) * | 1997-02-04 | 1997-11-05 | 冶金工业部钢铁研究总院 | Method for making sintered alloy balls |
| CN1302708A (en) * | 2000-09-08 | 2001-07-11 | 王旭 | Technology for making special shaped great ceramet parts |
| CN1569365A (en) * | 2003-07-23 | 2005-01-26 | 上海材料研究所 | Method for producing spheroid by powder stock |
| RU2299788C1 (en) * | 2005-10-24 | 2007-05-27 | Государственное образовательное учреждение высшего профессионального образования "Уфимский государственный авиационный технический университет" | Method for producing complex-profile hard-alloy articles |
-
2010
- 2010-04-06 CN CN2010101399608A patent/CN101817080B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163808A (en) * | 1997-02-04 | 1997-11-05 | 冶金工业部钢铁研究总院 | Method for making sintered alloy balls |
| CN1302708A (en) * | 2000-09-08 | 2001-07-11 | 王旭 | Technology for making special shaped great ceramet parts |
| CN1569365A (en) * | 2003-07-23 | 2005-01-26 | 上海材料研究所 | Method for producing spheroid by powder stock |
| RU2299788C1 (en) * | 2005-10-24 | 2007-05-27 | Государственное образовательное учреждение высшего профессионального образования "Уфимский государственный авиационный технический университет" | Method for producing complex-profile hard-alloy articles |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495728A (en) * | 2013-10-14 | 2014-01-08 | 自贡长城硬面材料有限公司 | Pressing method of hard alloy balls |
| CN104493161A (en) * | 2015-01-19 | 2015-04-08 | 四川科力特硬质合金股份有限公司 | Carburization method for hard alloy in vacuum sintering furnace |
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| Publication number | Publication date |
|---|---|
| CN101817080B (en) | 2012-05-09 |
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Granted publication date: 20120509 Termination date: 20160406 |