CN101716679A - Two-way pressing and forming method - Google Patents
Two-way pressing and forming method Download PDFInfo
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- CN101716679A CN101716679A CN200910265001A CN200910265001A CN101716679A CN 101716679 A CN101716679 A CN 101716679A CN 200910265001 A CN200910265001 A CN 200910265001A CN 200910265001 A CN200910265001 A CN 200910265001A CN 101716679 A CN101716679 A CN 101716679A
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Abstract
The invention discloses a two-way pressing and forming method which comprises the following steps: the center part of an external convex bar of a female die is provided with a run-through die cavity, and the joint of the wall of the die cavity and the edge of the external convex bar is provided with an incline opening which is matched with the shape of the back corner of an upper punching head; a feeding port of a bottom plate of a material push box of a two-way press is matched with the shape of the upper end face of the die cavity of the female die; when the material push box retreats towards the filler of the die cavity, inclines at both sides of the material push box bottom plate scrape material at the position of an opening of the corresponding incline of the die cavity out of the die cavity, the material at the corresponding position in the die cavity forms one incline, and the rest material in the die cavity is strickled by the bottom plate of the material push box; and after being pressed, a semi-finished product with the back corner is obtained. The forming method plays the role of regulating the charging density distribution in the die cavity. The phenomenon of cracks caused by the non-uniform contraction of a product is overcome by pressing the semi-finished product, and the qualified rate of the product is enhanced.
Description
Technical field
The present invention relates to a kind of two-way pressing and forming method, especially a kind of up and down both ends of the surface are all with big relief angle, the product two-way pressing and forming method of thin special-shaped product.
Background technology
Carbide alloy compression moulding mode is various, for the most formula that freely the falls into loading process (" carbide alloy manufacturing technology " Zhou Shengan writes) that adopt flat big plate of full-automatic bidirectional press, be that when filling with substance pusher box is shifted powder onto the die cavity top, rely on the powder own wt to fall in the die cavity, powder freely is filled to big plate and flushes.Die cavity is a through hole.But for the more special product of some face shapings, as two sides up and down all with the thin special-shaped product of big relief angle, product, though can realize compression moulding by last low punch band relief angle.But the problem that has certain density contrast after this type of formed product is especially big owing to local compression pressure at the relief angle place, and product is very easily cracked, even with product process isostatic cool pressing, the first-time qualification rate of product still has only about 50% after the vacuum-sintering again.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of two-way pressing and forming method.
In order to solve above technical problem, the present invention adopts following steps,
(1) with former, go up low punch and pack in the two-way press, described upper punch headband relief angle, described former middle part is provided with outer raised line, and there is the die cavity of perforation in outer raised line heart portion, the junction, edge of die cavity wall and outer raised line be provided with upper punch after the suitable inclined-plane opening of angular shape;
(2) shape of the feeding port of two-way press pusher box plate and cavity space upper surface is suitable, i.e. the middle part indent of pusher box feeding port, and the feeding port both sides are the scraper inclined-plane;
(3) start press, the pusher box is behind the die cavity fill material, the scraper inclined-plane of its both sides scraped die cavity with the material of the die cavity inclined-plane opening part of correspondence when the pusher box retreated, and make the material of this corresponding position in the die cavity form an inclined-plane, and rest materials was pushed the strickling of magazine base plate in the die cavity;
(4) press compacting obtains the compacting semi-finished product with relief angle.
Further, the bottom of cavity space forming area is provided with relief angle moulding inclined-plane.Obtain upper and lower side after the compacting and wear the compacting semi-finished product of relief angle.
Further, low punch band relief angle; Obtain upper and lower side after the compacting and wear the compacting semi-finished product of relief angle.
Further again, there is boss at the middle part of upper and lower drift; Obtain upper and lower side after the compacting and wear relief angle, and the middle part have counterbore the compacting semi-finished product.
The upper and lower side that adopts the inventive method to produce is worn the special-shaped product of big relief angle, thin thickness, even without the isostatic cool pressing PROCESS FOR TREATMENT, the first-time qualification rate of product also can reach more than 80% after the vacuum-sintering.
Description of drawings
The present invention will illustrate by embodiment and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the product schematic diagram that mould of the present invention is produced.
Fig. 2 is an embodiment of the invention female mould structure schematic diagram.
Fig. 3 is a former three-dimensional structure diagram shown in Figure 2.
Fig. 4 is a upper punch structural representation of the present invention.
Fig. 5 is the vertical view of Fig. 4.
Fig. 6 is the structural representation of low punch of the present invention.
Fig. 7 is the vertical view of Fig. 6.
The specific embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Special-shaped product as shown in Figure 1, both ends of the surface all have big relief angle 1 about it, and two-sided have a counterbore 2, product thickness is little, the not enough 2mm of both ends of the surface relief angle place straight flange thickness, adopt traditional briquetting process, then will feed in relief angle place in product upper surface more, powder is subjected to same reduced size, then herein constriction coefficient will be different with the constriction coefficient at other positions of product behind the sintering, and product produces certain deformation, and being out of shape big then can influence the product size precision, serious meeting crackle, the position that this product cracks mainly concentrate on both ends of the surface relief angle straight flange place and counterbore edge up and down.
Former shown in Fig. 2,3, the former middle part is provided with outer raised line 3, there is the die cavity 4 of perforation in outer raised line heart portion, the junction, edge of die cavity two ends and outer raised line be provided with product after the suitable inclined-plane opening 6 of angular shape, be the middle part projection of die cavity upper surface, both sides and upper punch corresponding position are downward inclined-plane.The die cavity of above-mentioned shape adds man-hour, calculates the angle and the degree of depth of blanking punch phantom chamber deflection according to the size of product upper surface relief angle (length).Shape after the die cavity cutting is guaranteed can just seal when upper punch enters die cavity, only stays a small amount of slit so that exhaust.Bottom at the cavity space forming area is provided with and the suitable inclined-plane 5 of special-shaped product lower surface relief angle.The structure of the low punch that be mated this moment sees shown in Fig. 6,7 that its low punch upper surface is the straight angle 9, and there is boss 10 at the middle part.
Upper punch structure shown in Fig. 4,5, relief angle 7 is worn in the upper end, and there is boss 8 at the middle part.
The bottom, cavity forming zone that certain above-mentioned mould also can change former into is that low punch is with relief angle as upper punch not with the through hole on moulding inclined-plane.
The constriction coefficient that above-mentioned mould adopts is 1.22-1.30, is preferably 1.25.Select relatively large constriction coefficient, can reduce powder degree by compression and promptly reduce the crackle tendency.
The feeding port of two-way press pusher box plate and the shape of cavity space upper surface are suitable, i.e. the middle part indent of pusher box feeding port, and suitable with the middle part projection of the upper surface of die cavity, the scraper inclined-plane of feeding port both sides and inclined-plane, die cavity two ends are suitable.
Above-mentioned mould is packed in the two-way press, and mould assembling perpendicularity deviation is not more than 2um, guarantees that the product thickness deviation must not surpass 2um.Adopt the two-way press of said apparatus, under the situation that does not change the motor-driven work of bidirection press, die cavity charging back pushing by the pusher box, make the material of this corresponding position in the die cavity form an inclined-plane, and rest materials is pushed the strickling of magazine base plate in the die cavity, has played the effect that loading density distributes in the die cavity of adjusting.Pressing speed is controlled at below 10 times/minute during compacting.The semi-finished product that compacting obtains have overcome product and have shunk inhomogeneous and seminess that cause, the raising product percent of pass.
The present invention is applicable to powder metallurgy industry product molding procedure, by the improvement to molding mode, can improve the Density Distribution of product preferably, thereby reduces the crackle of product, improves the first-time qualification rate of product.
Claims (6)
1. two-way pressing and forming method is characterized in that: comprises the steps,
(1) mould is packed in the two-way press, described mould comprises former, goes up low punch, described upper punch headband relief angle, described former middle part is provided with outer raised line, there is the die cavity of perforation in outer raised line heart portion, the junction, edge of die cavity wall and outer raised line be provided with upper punch after the suitable inclined-plane opening of angular shape;
(2) shape of the feeding port of two-way press pusher box plate and cavity space upper surface is suitable, i.e. the middle part indent of pusher box feeding port, and the feeding port both sides are the scraper inclined-plane;
(3) start press, the pusher box is to the die cavity fill material, the scraper inclined-plane of its both sides scraped die cavity with the material of the die cavity inclined-plane opening part of correspondence when the pusher box retreated, and make the material of this corresponding position in the die cavity form an inclined-plane, and rest materials was pushed the strickling of magazine base plate in the die cavity;
(4) press compacting obtains the compacting semi-finished product with relief angle.
2. two-way pressing and forming method as claimed in claim 1 is characterized in that:
The bottom of cavity space forming area is provided with relief angle moulding inclined-plane in the described step (1);
The press compacting obtains the compacting semi-finished product that upper and lower side is worn relief angle in the described step (4).
3. two-way pressing and forming method as claimed in claim 1 is characterized in that:
Low punch band relief angle in the described step (1);
The press compacting obtains the compacting semi-finished product that upper and lower side is worn relief angle in the described step (4).
4. as each described two-way pressing and forming method of claim 1-3, it is characterized in that:
There is boss at the middle part of upper and lower drift in the described step (1);
Press compacting in the described step (4), obtain upper and lower side wear relief angle and middle part have counterbore the compacting semi-finished product.
5. as each described two-way pressing and forming method of claim 1-3, it is characterized in that: the constriction coefficient of described mould is 1.22-1.30.
6. two-way pressing and forming method as claimed in claim 4 is characterized in that: the perpendicularity deviation of described mould assembling is not more than 2um, and pressing speed is not higher than 10 times/minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102650018A CN101716679B (en) | 2009-12-28 | 2009-12-28 | Two-way pressing and forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102650018A CN101716679B (en) | 2009-12-28 | 2009-12-28 | Two-way pressing and forming method |
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| Publication Number | Publication Date |
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| CN101716679A true CN101716679A (en) | 2010-06-02 |
| CN101716679B CN101716679B (en) | 2011-05-25 |
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| CN2009102650018A Active CN101716679B (en) | 2009-12-28 | 2009-12-28 | Two-way pressing and forming method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717072A (en) * | 2012-05-30 | 2012-10-10 | 自贡硬质合金有限责任公司 | Die and die assembly method |
| CN104707999A (en) * | 2015-03-16 | 2015-06-17 | 江西稀有稀土金属钨业集团有限公司 | Special-shaped powder metallurgical product punch forming method and die |
| CN105290398A (en) * | 2015-10-21 | 2016-02-03 | 江西稀有稀土金属钨业集团有限公司 | Combined type profiling pushing system |
| CN109807335A (en) * | 2019-02-26 | 2019-05-28 | 成都西顿硬质合金有限公司 | A kind of production method of the cutting tool blank with transition face |
-
2009
- 2009-12-28 CN CN2009102650018A patent/CN101716679B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717072A (en) * | 2012-05-30 | 2012-10-10 | 自贡硬质合金有限责任公司 | Die and die assembly method |
| CN104707999A (en) * | 2015-03-16 | 2015-06-17 | 江西稀有稀土金属钨业集团有限公司 | Special-shaped powder metallurgical product punch forming method and die |
| CN105290398A (en) * | 2015-10-21 | 2016-02-03 | 江西稀有稀土金属钨业集团有限公司 | Combined type profiling pushing system |
| CN109807335A (en) * | 2019-02-26 | 2019-05-28 | 成都西顿硬质合金有限公司 | A kind of production method of the cutting tool blank with transition face |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101716679B (en) | 2011-05-25 |
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