CN115488334A - Compact forming equipment for hard alloy rod - Google Patents
Compact forming equipment for hard alloy rod Download PDFInfo
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- CN115488334A CN115488334A CN202211185338.XA CN202211185338A CN115488334A CN 115488334 A CN115488334 A CN 115488334A CN 202211185338 A CN202211185338 A CN 202211185338A CN 115488334 A CN115488334 A CN 115488334A
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- hard alloy
- resistance
- resistor
- conductor contact
- alloy rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/093—Compacting only using vibrations or friction
Abstract
The invention discloses compact forming equipment for a hard alloy rod, which comprises a die and an isostatic pressing chamber, wherein a die cover is arranged at the top of the die, an exhaust pipe extending to the outside of the isostatic pressing chamber is arranged on the die cover, an ejection pipe extending to the outside of the isostatic pressing chamber is arranged at the bottom of the die, an upper electric plate is arranged on the exhaust pipe, a lower electric plate is arranged on the ejection pipe, and the upper electric plate and the lower electric plate are connected with a density detection circuit.
Description
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to compact forming equipment for a hard alloy rod.
Background
The hard alloy rod of refractory metal is generally prepared by adopting a powder metallurgy process, and the alloy powder is subjected to compression molding, including hydraulic press molding and isostatic pressing molding, and then sintered to obtain a corresponding target blank. In the isostatic compaction process of the alloy powder, the conditions such as temperature, pressure, pressing time and the like need to be controlled, so that the blank to be sintered with qualified density can be obtained. The density of the hard alloy rod blank is generally measured by using a density meter after the blank is formed, and the density is used for judging whether the density of the blank is qualified or not, the blank with unqualified density needs to be reprocessed, and the process is complicated.
Disclosure of Invention
The invention aims to solve the problem that the density of a hard alloy rod blank is measured after forming in the prior art, and provides a hard alloy rod compact forming device which is used for realizing the measurement of the hard alloy rod blank during forming and improving the density qualification rate of the hard alloy rod blank in the forming stage.
In order to achieve the purpose, the invention adopts the following technical scheme:
the hard alloy rod compact forming equipment comprises a mould and an isostatic pressure chamber, wherein a bottom support for placing the mould is arranged at the bottom of the isostatic pressure chamber; the top of the mould is provided with a mould cover, the mould cover is provided with an exhaust pipe extending to the outside of the isostatic pressure chamber, and the bottom of the mould is provided with a top outlet pipe extending to the outside of the isostatic pressure chamber. The outer part of the exhaust pipe is fixedly provided with a mounting seat, the upper end of the isostatic pressing chamber is provided with an upper cover used for sealing the upper part of the isostatic pressing chamber, and the mounting seat is in threaded connection with the upper cover.
The isostatic pressing chamber is provided with a high-pressure air pipe, and alloy powder is placed in the die. And the high-pressure gas pipe is used for completing the gas inlet of the high-pressure gas, and the high-pressure gas performs isobaric extrusion forming on the alloy powder in the die. The heating elements are arranged on the inner wall of the isostatic pressing chamber, and the appropriate process temperature is provided when the isostatic pressing treatment is carried out.
Furthermore, the lower extreme of blast pipe sets up the last conductor contact piece with blast pipe inner wall sliding connection, and the upper end of blast pipe sets up the connecting block, go up and set up elastic conductor between conductor contact piece and the last connecting block, set up the last electroplax that is used for connecting circuit on the last connecting block, go up elastic conductor lower extreme and connect the upper conductor contact piece, go up the elastic conductor upper end and connect the electroplax. The upper elastic conductor is used for pressing the upper conductor contact block downwards, so that the upper conductor contact block is always in contact with the upper part of the alloy powder aggregate in the alloy powder molding process.
Furthermore, the upper elastic conductor is provided with air holes communicated with the mold and the exhaust pipe on the upper conductor contact block, the upper connecting block is provided with an air guide pipe, and the exhaust pipe can be communicated with the inside and the outside of the mold and is used for exhausting the mold.
Furthermore, the upper end of the ejector pipe is provided with a lower conductor contact block which is slidably connected with the inner wall of the ejector pipe, the lower end of the ejector pipe is provided with a lower connecting block, a lower elastic conductor is arranged between the lower conductor contact block and the lower connecting block, and the lower connecting block is also provided with a lower electric connection plate for connecting a circuit. The upper end of the lower elastic conductor is connected with the lower conductor contact block, the lower end of the lower elastic conductor is connected with the lower electric connection plate, and the lower elastic conductor is used for pressing the lower conductor contact block upwards so that the lower conductor contact block is always kept in contact with the lower part of the alloy powder aggregate in the alloy powder forming process.
Furthermore, the lower end of the lower conductor contact block is fixedly connected with an ejector rod extending out from the lower end of the ejector pipe, and the ejector rod can push the lower conductor contact block, so that the lower conductor contact block can push out the formed hard alloy rod in the die.
The invention also comprises a method for measuring the qualified density of the hard alloy rod, which comprises the following steps: and measuring the resistance R3 of the formed hard alloy rod by using a detection circuit. When the resistance R3 is larger than the maximum value of the standard resistance, the compactness is insufficient; when the resistor R3 is within the standard resistor range, the density is qualified.
The method for obtaining the standard resistance comprises the following steps:
step A1: sampling a plurality of hard alloy rods with qualified compactness, measuring the resistance value of each hard alloy rod under the same temperature and high-pressure environment, recording, and sequencing the resistance values from bottom to top to obtain r1, r2, r3,. And rn;
step A2: removing r1 and rn, obtaining an average value Rav of r2, r3, the.
Step A3: the sum of the average value Rav and the variance sigma is taken as the maximum resistance value Rmax, the difference of the average value Rav and the variance sigma is taken as the minimum resistance value Rmin, and the interval of the standard resistance is [ Rmin, rmax ].
The detection circuit comprises a power supply, a resistor R1, a resistor R2, a switch K1, a switch K2, a voltmeter and a load access end, wherein the power supply, the resistor R1, the resistor R2 and the switch K1 are connected in series and the load access end is connected in series, the switch K2 is connected with the resistor R2 in parallel, and the voltmeter is connected with the resistor R1 in parallel. And two ends of the load access end are respectively connected with an upper connecting plate and a lower connecting plate. After the hard alloy rod is formed, the upper electric connection plate is connected with the upper end of the hard alloy rod through the upper elastic conductor and the upper conductor contact block, and the lower electric connection plate is connected with the lower end of the hard alloy rod through the lower elastic conductor and the lower conductor contact block.
When the compactness of the hard alloy rod is measured, the switches K1 and K2 are closed, the voltage V at two ends of the resistor R1 is measured by the voltmeter, and the resistance value R3, R3= (220-V) R1/V of the hard alloy rod can be obtained through calculation.
In the invention, the isostatic pressing chamber is also provided with magnetic plates, and the molds between the magnetic plates can form a magnetic field. In alloy powder forming process, can switch on alloy powder through detection circuitry for alloy powder is electrified, and electrified alloy powder can remove in magnetic field, through the magnetic pole that changes magnetic field, can make alloy powder produce the vibration, is favorable to gaseous discharge in forming process, promotes alloy powder forming efficiency and fine and close degree of consistency.
When the forming and exhausting are carried out, the switch K1 is closed, the switch K2 is opened, the resistor R1 and the resistor R2 are simultaneously connected into a circuit, and the resistor R2 is a variable resistor and used for adjusting the voltage at two ends of the alloy powder pile according to the compactness of the alloy powder, so that proper micro-current is generated in the alloy powder.
The invention has the beneficial effects that: the compact forming equipment for the hard alloy rod is used for isostatic pressing of alloy powder, and the alloy powder is electrified in the forming process, so that alloy powder particles vibrate in an electrified manner, air between the powder particles is conveniently discharged, the forming efficiency and the compact uniformity of the alloy powder are improved, meanwhile, the compact forming equipment can be used for detecting the resistance of the formed hard alloy rod, the hard alloy rod with qualified density is obtained in the isostatic pressing process, the yield is improved, and the compact forming equipment is practical in function.
Drawings
FIG. 1 is a schematic structural diagram of the hard alloy rod compact forming equipment;
FIG. 2 is a schematic structural diagram of the compact forming device A for the hard alloy rod;
FIG. 3 is a schematic structural diagram of the hard alloy rod compact forming equipment B;
fig. 4 is a schematic structural diagram of the detection circuit.
In the figure: 1. a mold; 2. a mold cover; 3. an exhaust pipe; 4. ejecting a pipe; 5. a shaking cylinder; 6. a static pressure chamber; 7. a bottom support; 8. a movable frame; 9. ejecting the rod; 10. a high-pressure air pipe; 11. an electromagnetic block; 31. an upper conductor contact block; 32. an upper elastic conductor; 33. an upper connecting block; 34. air holes; 35. an air duct; 36. an upper connection electric plate; 37. a mounting base; 41. a lower conductor contact block; 42. a lower elastic conductor; 43. a lower connecting block; 44. a lower connection plate; 51. a righting block; 61. an upper cover; 62. and (7) a lower cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, the hard alloy rod dense forming equipment comprises a mould 1 and an isostatic pressing chamber 6, wherein the bottom of the isostatic pressing chamber 6 is provided with a bottom support 7 for placing the mould 1; the top of the mould 1 is provided with a mould cover 2, the mould cover 2 is provided with an exhaust pipe 3 extending to the outside of the isostatic pressure chamber 6, and the bottom of the mould 1 is provided with an ejection pipe 4 extending to the outside of the isostatic pressure chamber 6. The outer part of the exhaust pipe 3 is fixedly provided with a mounting seat 37, the upper end of the isostatic pressure chamber 6 is provided with an upper cover 61 for sealing the upper part of the isostatic pressure chamber 6, and the mounting seat 37 is in threaded connection with the upper cover 61.
The isostatic pressing chamber 6 is provided with a high-pressure air pipe 10, and alloy powder is placed into the die 1, in the invention, the die cover 2 is in threaded connection with the die 1, the threaded connection between the die cover 2 and the die 1 corresponds to the threaded connection position of the mounting seat 37 and the upper cover 61, and when the threaded connection of the die cover 2 is completed, the threaded connection of the mounting seat 37 and the upper cover 61 is also completed. The high-pressure gas pipe 10 is used for feeding high-pressure gas, and the high-pressure gas performs isobaric extrusion forming on the alloy powder in the die. The inner wall of the isostatic pressing chamber 6 is provided with heating elements which provide proper process temperature when performing isostatic pressing. Correspondingly, the isostatic pressure chamber 6 is also provided with corresponding cooling elements for cooling the cemented carbide rod.
The diameter of the mounting seat 37 is larger than that of the die 1, so that the die 1 and the hard alloy rod can be conveniently taken out.
Referring to fig. 2, an upper conductor contact block 31 slidably connected to the inner wall of the exhaust pipe 3 is disposed at the lower end of the exhaust pipe 3, an upper connection block 33 is disposed at the upper end of the exhaust pipe 3, an upper elastic conductor 32 is disposed between the upper conductor contact block 31 and the upper connection block 33, an upper connection plate 36 for connecting a circuit is disposed on the upper connection block 33, the lower end of the upper elastic conductor 32 is connected to the upper conductor contact block 31, and the upper end of the upper elastic conductor 32 is connected to the upper connection plate 36. The upper elastic conductor 32 at this time serves to press the upper conductor contact block 31 downward so that the upper conductor contact block 31 is always kept in contact with the upper portion of the alloy powder aggregate during the alloy powder molding process.
Furthermore, the upper elastic conductor 32 is provided with an air hole 34 on the upper conductor contact block 31 for communicating the mold 1 and the exhaust pipe 3, the upper connection block 33 is provided with an air duct 35, the exhaust pipe 3 can be communicated with the inside and the outside of the mold 1, and the air duct 35 can be used for connecting a vacuum pump for exhausting the mold.
Referring to fig. 3, a lower conductor contact block 41 slidably connected to the inner wall of the ejection tube 4 is disposed at the upper end of the ejection tube 4, a lower connection block 43 is disposed at the lower end of the ejection tube 4, a lower elastic conductor 42 is disposed between the lower conductor contact block 41 and the lower connection block 43, and the lower connection block 43 is also provided with a lower connection plate 44 for connecting a circuit. The upper end of the lower elastic conductor 42 is connected to the lower conductor contact block 41, the lower end of the lower elastic conductor 42 is connected to the lower contact plate 44, and the lower elastic conductor 42 is used for pressing the lower conductor contact block 41 upwards, so that the lower conductor contact block 41 is always in contact with the lower part of the alloy powder aggregate in the alloy powder molding process.
Furthermore, the lower end of the lower conductor contact block 41 is fixedly connected to an ejector rod 9 extending from the lower end of the ejector tube 4, and the ejector rod 9 can push the lower conductor contact block 41, so that the lower conductor contact block 41 can push out the formed hard alloy rod in the mold 1.
The invention also comprises a method for measuring the qualified density of the hard alloy rod, which comprises the following steps: and measuring the resistance R3 of the formed hard alloy rod by using a detection circuit. When the resistance R3 is larger than the maximum value of the standard resistance, the compactness is insufficient; when the resistance R3 is within the standard resistance range, the density is qualified.
The method for obtaining the standard resistor comprises the following steps:
step A1: sampling a plurality of hard alloy rods with qualified compactness, measuring the resistance value of each hard alloy rod under the same temperature and high pressure environment, recording the resistance values, and sequencing the resistance values from bottom to top to obtain r1, r2, r3, · rn;
step A2: removing r1 and rn, obtaining an average value Rav of r2, r3, the.
Step A3: taking the sum of the average value Rav and the variance sigma as a maximum resistance value Rmax, taking the difference of the average value Rav and the variance sigma as a minimum resistance value Rmin, and taking the interval of the standard resistance as [ Rmin, rmax ].
Referring to fig. 4, the detection circuit includes a power supply, a resistor R1, a resistor R2, a switch K1, a switch K2, a voltmeter and a load access end, the power supply, the resistor R1, the resistor R2, the switch K1 are connected in series and the load access end is connected in series, the switch K2 is connected in parallel with the resistor R2, and the voltmeter is connected in parallel with the resistor R1. The two ends of the load access end are respectively connected with the upper connecting board 36 and the lower connecting board 44. After the carbide rod is formed, the upper contact plate 36 is connected to the upper end of the carbide rod through the upper elastic conductor 32 and the upper conductor contact block 31, and the lower contact plate 44 is connected to the lower end of the carbide rod through the lower elastic conductor 42 and the lower conductor contact block 41.
When the compactness of the hard alloy rod is measured, the switches K1 and K2 are closed, the voltage V at two ends of the resistor R1 is measured by the voltmeter, and the resistance value R3, R3= (220-V) R1/V of the hard alloy rod can be obtained through calculation.
In the invention, the isostatic pressing chamber 6 is also provided with magnetic plates 11, and the mould 1 between the magnetic plates 11 can form a magnetic field. In alloy powder forming process, can switch on alloy powder through detection circuitry for alloy powder is electrified, and electrified alloy powder can remove in the magnetic field, through the magnetic pole that changes the magnetic field, can make alloy powder produce the vibration, is favorable to gaseous discharge in forming process, promotes alloy powder forming efficiency and fine and close degree of consistency.
When the forming and exhausting are carried out, the switch K1 is closed, the switch K2 is opened, the resistor R1 and the resistor R2 are simultaneously connected into a circuit, and the resistor R2 is a variable resistor and used for adjusting the voltage at two ends of the alloy powder pile according to the compactness of the alloy powder, so that proper micro-current is generated in the alloy powder.
Further, the isostatic pressing chamber 6 is provided with a shaking cylinder 5 which is horizontal in the axial direction, and the working end of the shaking cylinder 5 is provided with a centering block 51 which is contacted with the side surface of the die 1. The bottom of the isostatic pressure chamber 6 is provided with a moving frame 8 which is connected with the isostatic pressure chamber 6 in a sliding way in the horizontal direction, and the bottom support 7 and the ejection pipe 4 are fixedly connected with the moving frame 8. The bottom of the isostatic pressing chamber 6 is provided with a lower cover 62 for sealing the bottom of the isostatic pressing chamber 6, the lower cover 62 is provided with a slide way for ejecting the pipe 4 to move in the horizontal direction, and the bottom of the moving frame 8 is provided with a sliding sealing plate. The positions and dimensions of the sliding seal plate and the chute satisfy the following conditions: the sliding sealing plate always remains completely covering the slide of the lower cover 62 when the moving frame 8 is moved to the extreme position.
When alloy powder feeds, shake cylinder 5 and promote mould 1 and remove frame 8 for mould 1 rocks about the horizontal direction, is used for making evenly distributed and pile up more closely behind the alloy powder feeding. A position sensor may be arranged on the centering block 51, and the centering block 51 may be used for centering the mold and measuring the diameter during the process of forming the cemented carbide rod.
The working process of the hard alloy rod compact forming equipment comprises the following steps:
the method comprises the following steps: the threaded connection between the mounting seat 37 and the upper cover 61 and the threaded connection between the die cover 2 and the die 1 are released by rotating the exhaust pipe 3, alloy powder is put into the die 1 after the exhaust pipe 3 is taken away, and the shaking cylinder 5 pushes the die 1 and the moving frame 8 when the alloy powder is fed, so that the die 1 can shake left and right in the horizontal direction for uniformly distributing and more closely stacking the alloy powder after being fed;
step two: after feeding is finished, the exhaust pipe 3 is rotated to finish threaded connection between the mounting seat 37 and the upper cover 61 and threaded connection between the die cover 2 and the die 1, so that the die 1 and the isostatic pressing chamber 6 are sealed;
step three: the high-pressure gas pipe 10 is opened to feed gas, the high-pressure gas enters the isostatic pressing chamber 6, the alloy powder is extruded and formed, and a heating element of the isostatic pressing chamber 6 provides proper process temperature;
meanwhile, the detection circuit is operated, the switch K1 is closed, and the switch K2 is opened, so that proper micro-current is generated in the alloy powder, and the alloy powder is electrified; then the magnetic plate 11 starts to work to form a magnetic field, the electric alloy powder can move in the magnetic field, and the alloy powder can vibrate by changing the magnetic poles of the magnetic field, so that the gas in the die can be discharged, and the forming efficiency and the compactness uniformity of the alloy powder are improved;
the centering blocks 51 can be used for centering and diameter measurement in the process;
step four: after the isostatic pressing process is completed to a certain degree, a hard alloy rod is preliminarily formed, the density of the hard alloy rod is measured, the switches K1 and K2 are closed, the voltage V at two ends of the resistor R1 is measured by a voltmeter at the moment, and the resistance value R3, R3= (220-V) R1/V of the hard alloy rod can be obtained through calculation;
when the resistance R3 is larger than the maximum value of the standard resistance, the density is not enough, and the step five is carried out; and when the resistance R3 is within the standard resistance range, the density is qualified, and the step six is carried out.
Step five: continuing to perform isostatic pressing process treatment until the resistor R3 is within the standard resistor range, and then entering the sixth step;
step six: the high-pressure air pipe 10 is opened to exhaust air, the high pressure in the isostatic pressing chamber 6 is relieved, and meanwhile, the isostatic pressing chamber 6 is cooled, so that the temperature of the hard alloy rod is reduced;
step seven: the exhaust pipe 3 is rotated to release the screw connection between the mounting seat 37 and the upper cover 61 and the screw connection between the die cover 2 and the die 1, the mounting seat 37 is removed, the upper cover 62 is provided with a discharge hole, the ejector rod 9 pushes the lower conductor contact block 41, the lower conductor contact block 41 pushes out the formed hard alloy rod in the die 1, and the hard alloy rod can be taken out from the discharge hole of the upper cover 62.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The hard alloy rod compact forming equipment comprises a mould (1) and an isostatic pressing chamber (6), wherein the bottom of the isostatic pressing chamber (6) is provided with a bottom support (7) for placing the mould (1); the hot stamping die is characterized in that an upper conductor contact block (31) which is connected with the inner wall of the exhaust pipe (3) in a sliding manner is arranged at the lower end of the exhaust pipe (3), an upper connecting block (33) is arranged at the upper end of the exhaust pipe (3), an upper elastic conductor (32) is arranged between the upper conductor contact block (31) and the upper connecting block (33), an air hole (34) which is communicated with the die (1) and the exhaust pipe (3) is arranged on the upper conductor contact block (31), and an air guide pipe (35) is arranged on the upper connecting block (33);
the upper end of the ejector tube (4) is provided with a lower conductor contact block (41) which is in sliding connection with the inner wall of the ejector tube (4), the lower end of the ejector tube (4) is provided with a lower connecting block (43), a lower elastic conductor (42) is arranged between the lower conductor contact block (41) and the lower connecting block (43), and the lower end of the lower conductor contact block (41) is fixedly connected with an ejector rod (9) which extends out from the lower end of the ejector tube (4);
go up the last electric plate (36) that connects that sets up on connecting block (33) and be used for connecting circuit, lower connecting block (43) also sets up lower electric plate (44) that is used for connecting circuit.
2. The carbide rod densification forming apparatus according to claim 1, characterized in that the isostatic pressure chamber (6) is provided with an axially horizontal shaking cylinder (5), the working end of the shaking cylinder (5) being provided with a centering block (51) in contact with the side of the mould (1);
the bottom of the isostatic pressing chamber (6) is provided with a moving frame (8) which is connected with the isostatic pressing chamber (6) in a sliding way in the horizontal direction, and the bottom support (7) and the ejection pipe (4) are fixedly connected with the moving frame (8).
3. The hard alloy rod dense forming equipment according to the claim 2, characterized in that the bottom of the isostatic pressure chamber (6) is provided with a lower cover (62) for sealing the bottom of the isostatic pressure chamber (6), the lower cover (62) is provided with a slideway for ejecting the pipe (4) to move in the horizontal direction, and the bottom of the moving frame (8) is provided with a sliding sealing plate;
the positions and sizes of the sliding seal plate and the slideway satisfy the following conditions: when the movable frame (8) moves to the limit position, the sliding sealing plate always completely covers the slideway of the lower cover (62).
4. The apparatus of claim 1, further comprising a method for measuring the acceptable compactness of the cemented carbide rod, the method comprising the steps of: measuring the resistance R3 of the formed hard alloy rod by using a detection circuit;
when the resistance R3 is larger than the maximum value of the standard resistance, the compactness is insufficient; when the resistance R3 is within the standard resistance range, the density is qualified.
5. The hard alloy rod densification forming apparatus of claim 4, wherein the detection circuit comprises a power supply, a resistor R1, a resistor R2, a switch K1, a switch K2, a voltmeter and a load access terminal, the power supply, the resistor R1, the resistor R2, the switch K1 are connected in series and the load access terminal are connected in series, the switch K2 is connected with the resistor R2 in parallel, and the voltmeter is connected with the resistor R1 in parallel.
6. The apparatus of claim 4 or 5, wherein the standard electrical resistance is obtained by a method comprising the steps of:
step A1: sampling a plurality of hard alloy rods with qualified compactness, measuring the resistance value of each hard alloy rod under the same temperature and high pressure environment, recording the resistance values, and sequencing the resistance values from bottom to top to obtain r1, r2, r3, · rn;
step A2: removing r1 and rn, obtaining an average value Rav of r2, r3, the.
Step A3: taking the sum of the average value Rav and the variance sigma as a maximum resistance value Rmax, taking the difference of the average value Rav and the variance sigma as a minimum resistance value Rmin, and taking the interval of the standard resistance as [ Rmin, rmax ].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211185338.XA CN115488334B (en) | 2022-09-27 | 2022-09-27 | Compact forming equipment for hard alloy bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211185338.XA CN115488334B (en) | 2022-09-27 | 2022-09-27 | Compact forming equipment for hard alloy bar |
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| CN115488334A true CN115488334A (en) | 2022-12-20 |
| CN115488334B CN115488334B (en) | 2023-04-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2056367U (en) * | 1989-08-22 | 1990-04-25 | 航空航天工业部川西机器厂 | Magnetic field equal static pressure press |
| CN103866172A (en) * | 2012-12-17 | 2014-06-18 | 北京有色金属研究总院 | Narrow-particle size distribution extra-coarse cemented carbide and preparation method thereof |
| CN105834431A (en) * | 2016-04-11 | 2016-08-10 | 西安欧中材料科技有限公司 | Preparation method of high-uniformity Ti-6Al-4V alloy powder metallurgic block |
| CN106163702A (en) * | 2014-04-11 | 2016-11-23 | 艾尼吉恩有限公司 | The isostatic pressed press fit device heating and cooling down and the manufacture method utilizing its device manufacture chip type component can be carried out |
| CN106811655A (en) * | 2017-02-09 | 2017-06-09 | 江苏汇诚机械制造有限公司 | A kind of preparation method of tough high abrasion VC steel bonded carbide high |
| CN210045990U (en) * | 2019-04-30 | 2020-02-11 | 四川一然新材料科技有限公司 | Isostatic pressing electromagnetism vibrations formula charging devices |
| CN111804908A (en) * | 2020-06-04 | 2020-10-23 | 厦门金鹭硬质合金有限公司 | Isostatic pressing soft die sleeve weight-limiting and equal-volume powder filling process and device thereof |
-
2022
- 2022-09-27 CN CN202211185338.XA patent/CN115488334B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2056367U (en) * | 1989-08-22 | 1990-04-25 | 航空航天工业部川西机器厂 | Magnetic field equal static pressure press |
| CN103866172A (en) * | 2012-12-17 | 2014-06-18 | 北京有色金属研究总院 | Narrow-particle size distribution extra-coarse cemented carbide and preparation method thereof |
| CN106163702A (en) * | 2014-04-11 | 2016-11-23 | 艾尼吉恩有限公司 | The isostatic pressed press fit device heating and cooling down and the manufacture method utilizing its device manufacture chip type component can be carried out |
| CN105834431A (en) * | 2016-04-11 | 2016-08-10 | 西安欧中材料科技有限公司 | Preparation method of high-uniformity Ti-6Al-4V alloy powder metallurgic block |
| CN106811655A (en) * | 2017-02-09 | 2017-06-09 | 江苏汇诚机械制造有限公司 | A kind of preparation method of tough high abrasion VC steel bonded carbide high |
| CN210045990U (en) * | 2019-04-30 | 2020-02-11 | 四川一然新材料科技有限公司 | Isostatic pressing electromagnetism vibrations formula charging devices |
| CN111804908A (en) * | 2020-06-04 | 2020-10-23 | 厦门金鹭硬质合金有限公司 | Isostatic pressing soft die sleeve weight-limiting and equal-volume powder filling process and device thereof |
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| CN115488334B (en) | 2023-04-11 |
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