CN1632493A - Method and device for directly testing lateral pressure in powder compaction process - Google Patents
Method and device for directly testing lateral pressure in powder compaction process Download PDFInfo
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- CN1632493A CN1632493A CNA2004100775247A CN200410077524A CN1632493A CN 1632493 A CN1632493 A CN 1632493A CN A2004100775247 A CNA2004100775247 A CN A2004100775247A CN 200410077524 A CN200410077524 A CN 200410077524A CN 1632493 A CN1632493 A CN 1632493A
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- push rod
- ladder push
- ladder
- die cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/005—Control arrangements
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- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
This invention relates to material process field, which in detail is to a method and device to measure the powder side pressure when in compression. The device comprises one to eight step top bars, inner and outer mould chambers cooperated with the step top bars, pressure sensor and indicator. The large, middle and small ends of the step top bars are one whole, wherein, start from the small one to insert the inner and outer mould chambers with matching hole channel till touching the powder; the large end goes through steel ball or not to connect with the top column or pressure sensor. The continuous side pressure changes are directly displayed in the indicator connected with the pressure sensor.
Description
Technical field
The present invention relates to material processing field, specifically be meant the method and the device thereof of wall pressure in a kind of direct test powders pressing process.
Background technology
Domestic and international at present test for powder wall pressure in pressing process, all adopt the method for indirectly testing, as average wall pressure determination method, bayonet point, strain gage testing method etc., these method of testings have a common shortcoming: can not directly show and describe the true stressing conditions of powder in pressing process, the test findings error is bigger.In addition, these method of testings require very high to mould processing technology.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, be method and the device thereof described, analysed for powder variation of power in pressing process provides wall pressure in a kind of simple, dynamic directly test powders pressing process.
The method of wall pressure in a kind of direct test powders pressing process, it is characterized in that: the ladder push rod was inserted from small end beginning have the inside and outside die cavity duct of matching until contacting with powder with the ladder push rod, the big end of ladder push rod passes through steel ball, fore-set is connected with pressure transducer or the big end of ladder push rod is connected with pressure transducer by fore-set, on the indicating instrument that the variation of wall pressure continuously, directly is presented at pressure transducer links to each other.
Realize the device of the method for wall pressure in the above-mentioned a kind of direct test powders pressing process, it is characterized in that it by 1～8 ladder push rod, the inside and outside die cavity, pressure transducer, the indicating instrument that have a duct of matching with the ladder push rod formed; The small end beginning from the ladder push rod is inserted the inside and outside die cavity duct of matching with the ladder push rod, the big end of ladder push rod passes through steel ball, fore-set is connected with pressure transducer or the big end of ladder push rod is connected with pressure transducer by fore-set, and pressure transducer is connected with indicating instrument.Described ladder push rod is divided into two ladder push rods or three ladder push rods, and two ladder push rods are made up of big end and small end, and three ladder push rods are made up of big end, middle-end and small end.The xsect of ladder push rod can be that circle also can be square.If it is circular, be a cylindrical stepped integral body, its end diameter scope is 1～5cm, length equates with the inside cavity wall thickness; The length of the big end of the middle-end of three ladder push rods or two ladder push rods is longer than outer die cavity wall thickness, and its diameter becomes big by small end successively to big end.
The big end and the fore-set of ladder push rod are processed with the arc surface that cooperates with steel ball respectively; The ladder push rod links to each other with pressure transducer by steel ball, fore-set.
The small end of ladder push rod and inside cavity duct are little clearance fit, and the middle-end of ladder push rod is big clearance fit with outer cavity hole road.Between the inside and outside die cavity of device is interference fit.
The radical that the ladder push rod is required according to test is evenly distributed on the differing heights of inside and outside die cavity and/or the different angles in inside and outside die cavity cross section.Also can determine test position according to test request.
Compared with prior art, the present invention has following advantage:
1, the present invention is test method and the device thereof described, analysed for powder variation of wall pressure in pressing process provides simple, dynamic directly test wall pressure, can replace present powder compacting indirectly testing method, solved the problem of current wall pressure test difficulty to a great extent, for the densification of different phase and the homogenising of density in the research powder compaction process provide important basis, to improving powdered metal parts density, there is significant meaning the aspects such as range of application that enlarge powdered metal parts.
2, the present invention is directly passed to pressure transducer by push rod with the wall pressure of differing heights, and is presented on the indicating instrument, avoids measuring indirectly the deviation of bringing experimental result.
3, the present invention only has the small end of push rod to contact with powder, and contact area is relatively little, and the power of measuring can be similar to regards the pressure that bears as along push rod center line sustained height powder as, thereby reaches the purpose of layering research wall pressure.
Studies show that 4, the friction force of push rod in measurement is less, the each measurement finishes, and push rod can take out easily, so friction force can be ignored.
5, applied range of the present invention can be used for directly measuring the size of different materials wall pressure etc. in pressing process.As be used for metal powder, the test of wall pressure in the material pressing processes such as ceramic powders and plastic powders.
6, the present invention combines with testing software simultaneously, thereby obtains advantages such as higher reliability, intuitive and dynamometry are easy.
7, the present invention is simple in structure, and is easily manufactured; Material is common, and cost is low.
Description of drawings
Fig. 1 is the main TV structure synoptic diagram of device of wall pressure in a kind of direct test powders pressing process.
Fig. 2 is Fig. 1 plan structure synoptic diagram.
Fig. 3 is the enlarged diagram of I part among Fig. 1.
Fig. 4 is the three ladder push rod structure synoptic diagram that have steel ball to connect.
Fig. 5 is the two ladder push rod structure synoptic diagram that have steel ball to connect.
The two ladder push rod structure synoptic diagram that Fig. 6 connects for no steel ball.
The two ladder push rod structure synoptic diagram that Fig. 7 connects for no steel ball.
Fig. 8 is embodiment 2 ladder push rod distribution schematic diagrams.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment 1
As shown in Figure 1 and Figure 2, realize the device of the method for wall pressure in a kind of direct test powders pressing process, by 4 cylindrical three ladder push rods 6, the inside and outside die cavity 8,7, pressure transducer 3, the indicating instrument that have a duct of matching with three ladder push rods 6 formed; Cylindrical ladder push rod 6 is key components, three ladder push rods as shown in Figure 4, and it is a cylindrical stepped integral body of being made up of big end 17, middle-end 16, small end 15.Fig. 3 is a ladder push rod 6 and the synoptic diagram that cooperates of inside and outside die cavity 8,7, what insertion inside cavity 8, length equated with inside cavity 8 wall thickness is ladder push rod small end 15, that inserts that outer die cavity 7, length slightly be longer than outer die cavity 7 wall thickness is ladder push rod middle-end 16, and being processed with the arc surface that cooperates with steel ball 5 is the big end 17 of ladder push rod; The big end 17 of ladder push rod 6 links to each other with the arc surface fore-set 4 that is processed with steel ball 5 cooperations by steel ball 5, and the other end of fore-set 4 is connected with pressure transducer 3, and pressure transducer 3 is connected with indicating instrument.Small end 15 diameter ranges of ladder push rod 6 are 1～5cm, little, in, outside diameter becomes greatly successively, the small end 15 and inside cavity 8 ducts of ladder push rod 6 are little clearance fit, the middle-end 16 and outer die cavity 7 ducts of push rod 6 are big clearance fit.Between the inside and outside die cavity is interference fit.Ladder push rod 6 can be evenly distributed on the differing heights of inside and outside die cavity and/or the different angles in inside and outside die cavity cross section according to required the selecting for use of test in 1～8 scope.As shown in Figure 2, be the distribution schematic diagram that the device vertical view of wall pressure in a kind of direct test powders pressing process is 4 ladder push rods.4 ladder push rods 6 become on 90 ° of differing heights that are evenly distributed on mould, are used for testing the dynamic change situation of differing heights powder compaction process wall pressure.The small end 15 of ladder push rod 6 inserts and has inside and outside die cavity 8,7 ducts of matching with the ladder push rod until contacting with powder 13, ladder push rod 6 big ends are connected with pressure transducer 3 indirectly by steel ball 5, fore-set 4, and the variation of wall pressure continuously, directly is presented on the indicating instrument that links to each other with pressure transducer 3.
The big end 17 of ladder push rod 6 is connected with pressure transducer 3 indirectly by steel ball 5, this be because, consider the rigidity of material, adopt stepped appearance can reduce the deflection of ladder push rod 6 in pressing process as much as possible, also consider the processing in the duct on the inside and outside die cavity 8,7 of being convenient to ladder push rod 6 and matching simultaneously with it.Ladder push rod small end 15 adopts little clearance fit with the duct of inside cavity 8, and promptly will make between ladder push rod and mould has lubricating oil, reduces powder again and enters in the gap, and friction force is reduced.In addition, for fear of causing that because of contact area is excessive measuring layer scope increases the increase that causes error.Ladder push rod 6 small ends 15 adopt minor diameter, and the contact area with powder is also little like this, regards the wall pressure of measuring push rod center line layer as thereby can be similar to, and present embodiment small end 15 diameters are 1cm, and length equates with inside cavity 8 wall thickness.Middle-end 16 then adopts big clearance fit with outer die cavity 7, and good rigidity is out of shape and is lacked, thereby makes that the transmission of wall pressure is more even like this, and error is littler.Ladder push rod 6 middle-ends 16 length slightly are longer than outer die cavity 7 wall thickness.The big end 17 of ladder push rod 6 is processed with the arc surface that cooperates with steel ball 5, and is connected with pressure transducer 3 by steel ball and the fore-set 4 that is processed with the arc surface that cooperates with steel ball 5.Consider in addition ladder push rod 6 in the process of motion with the friction of die wall, in the manufacturing of ladder push rod, adopt the disposal route of grinding small end, the gap is reduced.Simultaneously, in the dynamometry operating process, can be coated with the last layer lubricant on its surface,, friction factor be reduced, thereby measure the size of wall pressure more exactly as machine oil, PTFE etc.Among Fig. 1: 9 is upper punch; 10 is bolt; 11 is compact heap; 12 is heating plate; 14 is bottom punch.
When powder 13 compressions, because the mutual extrusion effect of powder 13, pressed compact is to lateral expansion, and according to the transfer principle of power, the wall pressure that it produced is outwards transmitted by the small end 15 of ladder push rod 6.To big end 17, be passed to pressure transducer 3 by small end 15, middle-end 16 by steel ball 5, the fore-set 4 that is fixed on the pressure transducer 3.One end of fore-set 4 and big 17 the same arc surface that matches with steel ball that is processed with of an end of holding, like this, steel ball 5 can play a part centering in debug process, even ladder push rod 6 center lines and pressure transducer 3 center lines remain on the same straight line.And pressure transducer 3 is fixed on the back up pad 2 by bolt 1, and the center that makes back up pad 2 have enough spaces to be used for pressure transducer 3 is regulated.The size that like this, finally is delivered to the wall pressure of pressure transducer 3 continuously, directly is presented on the terminal indicating instrument.
Embodiment 2
As shown in Figure 8, ladder push rod 6 is 7, and becomes 51 ° 25 ' 43 and " be evenly distributed on the mould differing heights; Push rod 6 small ends 15 diameters are 2cm, also can 3cm or 4cm or 5cm.Remaining embodiment is all the same with embodiment 1.
Embodiment 3
The device of wall pressure can be two ladder push rods in a kind of direct test powders pressing process, and as shown in Figure 5, it is made up of big end 17, small end 15.What insert that inside cavity 8, length equate with inside cavity 8 wall thickness is two ladder push rod small ends 15, inserts outer die cavity 7, length slightly is longer than outer die cavity 7 wall thickness, and to be processed with the arc surface that cooperates with steel ball 5 be the big ends 17 of two ladder push rods; The big end 17 of two ladder push rods 6 links to each other with the arc surface fore-set 4 that is processed with steel ball 5 cooperations by steel ball 5, and the other end of fore-set 4 is connected with pressure transducer 3, and pressure transducer 3 is connected with indicating instrument.Remaining embodiment all with
Embodiment 1 is the same with 2.
Embodiment 4
Be respectively two, the three ladder push rods that no steel ball connects as Fig. 6, Fig. 7.The big end 17 of ladder push rod is the plane, also is that the fore-set 4 on plane is connected with pressure transducer 3 by end face.The verticality of the end face that this state requires the big end 17 of ladder push rod and the center line of the verticality of ladder push rod 6 center lines and fore-set 4 end faces and fore-set all reaches 7 grades of verticality when above, can avoid causing the push rod inclination, can satisfy test condition.The variation of wall pressure also can continuously, directly be presented on the indicating instrument that links to each other with pressure transducer 3 like this.Remaining embodiment is all the same with embodiment 1,2 and 3.
Embodiment 5
No matter the device of wall pressure adopts the mode of two ladder push rods or three ladder push rods in a kind of direct test powders pressing process, and its xsect can also be square.Remaining embodiment is all the same with embodiment 1,2,3 and 4.
Claims (9)
1, the method for wall pressure in a kind of direct test powders pressing process, it is characterized in that: the ladder push rod was inserted from small end beginning have the inside and outside die cavity duct of matching until contacting with powder with the ladder push rod, the big end of ladder push rod passes through steel ball, fore-set is connected with pressure transducer or the big end of ladder push rod is connected with pressure transducer by fore-set, on the indicating instrument that the variation of wall pressure continuously, directly is presented at pressure transducer links to each other.
2, realize the device of the method for wall pressure in the described a kind of direct test powders pressing process of claim 1, it is characterized in that it by 1～8 ladder push rod (6), the inside and outside die cavity (8,7), pressure transducer (3), the indicating instrument that have a duct of matching with ladder push rod (6) formed; Small end (15) beginning from ladder push rod (6) is inserted the inside and outside die cavity duct of matching with ladder push rod (6), the big end (17) of ladder push rod (6) links to each other with pressure transducer (3) by steel ball (5), fore-set (4) or big hold (17) of ladder push rod (6) are connected with pressure transducer (3) by fore-set (4), and pressure transducer (3) is connected with indicating instrument.
3, the device of wall pressure in a kind of direct test powders pressing process according to claim 2, it is characterized in that: described ladder push rod (6) is two ladder push rods or three ladder push rods, two ladder push rods (6) are made up of big end (17) and small end (15), and three ladder push rods (6) are made up of big end (17), middle-end (16), small end (15).
4, according to the device of wall pressure in claim 2 or the 3 described a kind of direct test powders pressing processes, it is characterized in that: ladder push rod (6) is a cylindrical stair-stepping integral body, its small end (15) diameter range is 1～5cm, and length equates with inside cavity (8) wall thickness; The length of the big end (17) of middle-end of three ladder push rods (16) or two ladder push rods is longer than outer die cavity (7) wall thickness, and its diameter becomes big by small end successively to big end.
5, according to the device of wall pressure in claim 2 or the 3 described a kind of direct test powders pressing processes, it is characterized in that: the big end (17) and the fore-set (4) of ladder push rod (6) are processed with the arc surface that cooperates with steel ball (5) respectively; Ladder push rod (6) links to each other with pressure transducer (3) by steel ball (5), fore-set (4).
6, according to the device of wall pressure in claim 2 or the 3 described a kind of direct test powders pressing processes, it is characterized in that: the small end (15) of ladder push rod (6) is little clearance fit with inside cavity (8) duct, and the big end (17) of middle-end of three ladder push rods (16) or two ladder push rods is big clearance fit with outer die cavity (7) duct.
7, the device of wall pressure in a kind of direct test powders pressing process according to claim 2 is characterized in that: be interference fit between its inside and outside die cavity (8,7).
8, according to the device of wall pressure in claim 2 or the 3 described a kind of direct test powders pressing processes, it is characterized in that: the radical that ladder push rod (6) is required according to test is evenly distributed on the differing heights of inside and outside die cavity (8,7) and/or the different angles in inside and outside die cavity (8,7) cross section.
9, according to the device of wall pressure in claim 2 or the 3 described a kind of direct test powders pressing processes, it is characterized in that: the xsect of ladder push rod (6) is square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100775247A CN1303410C (en) | 2004-12-22 | 2004-12-22 | Method and device for directly testing lateral pressure in powder compaction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100775247A CN1303410C (en) | 2004-12-22 | 2004-12-22 | Method and device for directly testing lateral pressure in powder compaction process |
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| Publication Number | Publication Date |
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| CN1632493A true CN1632493A (en) | 2005-06-29 |
| CN1303410C CN1303410C (en) | 2007-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100775247A Expired - Fee Related CN1303410C (en) | 2004-12-22 | 2004-12-22 | Method and device for directly testing lateral pressure in powder compaction process |
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| CN (1) | CN1303410C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436116C (en) * | 2006-08-11 | 2008-11-26 | 佛山市恒力泰机械有限公司 | Pressure monitord by displacement type method for controlling fluid form machine for powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3321285C2 (en) * | 1983-06-13 | 1985-06-20 | Anton 8240 Berchtesgaden Stigler | Method for producing a profile from dry powder material and device for this |
| ES2089696T3 (en) * | 1992-03-18 | 1996-10-01 | Eidgenoess Munitionsfab Thun | PROCEDURE AND DEVICE FOR ALMOST ISOSTATIC PRESSING, ESPECIALLY OF EXPLOSIVE PRECISION LOADS, THERMOPLASTICALLY LINKED. |
| CN2550169Y (en) * | 2002-06-28 | 2003-05-14 | 孙加澎 | Mechanical type full automatic powder press |
| CN2647569Y (en) * | 2003-09-25 | 2004-10-13 | 谢印光 | Press mechanism for powder forming machine |
| CN2777525Y (en) * | 2004-12-22 | 2006-05-03 | 华南理工大学 | Apparatus for directly testing side pressure in powder pressing process |
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2004
- 2004-12-22 CN CNB2004100775247A patent/CN1303410C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436116C (en) * | 2006-08-11 | 2008-11-26 | 佛山市恒力泰机械有限公司 | Pressure monitord by displacement type method for controlling fluid form machine for powder |
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| CN1303410C (en) | 2007-03-07 |
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