CN118162620B - Powder shaping device - Google Patents
Powder shaping device Download PDFInfo
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- CN118162620B CN118162620B CN202410605638.1A CN202410605638A CN118162620B CN 118162620 B CN118162620 B CN 118162620B CN 202410605638 A CN202410605638 A CN 202410605638A CN 118162620 B CN118162620 B CN 118162620B
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- die
- elastic
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- 239000000843 powder Substances 0.000 title claims abstract description 101
- 238000007493 shaping process Methods 0.000 title claims abstract description 50
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 238000001125 extrusion Methods 0.000 claims description 26
- 238000009434 installation Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 5
- 238000005056 compaction Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000000670 limiting effect Effects 0.000 description 14
- 239000002245 particle Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000000314 lubricant Substances 0.000 description 8
- 230000002411 adverse Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000005242 forging Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004663 powder metallurgy Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- JPNWDVUTVSTKMV-UHFFFAOYSA-N cobalt tungsten Chemical compound [Co].[W] JPNWDVUTVSTKMV-UHFFFAOYSA-N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
- B22F3/164—Partial deformation or calibration
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
The invention discloses a powder shaping device, which comprises a lower die and an upper die for providing pressing force, wherein the lower die is rotatably arranged on a base, the outer side wall of the lower die is fixedly connected with a plurality of convex blocks positioned in the same horizontal plane, the powder shaping device also comprises an elastic knocking part fixedly connected on the base, the elastic knocking part and the convex blocks are correspondingly arranged, and a driving mechanism drives the lower die to rotate; the invention provides a powder shaping device, which is characterized in that powder in a lower die is enabled to be close to the inner side wall of the lower die under the action of centrifugal force by rotating the lower die, so that the powder is uniformly distributed, at the moment, a bump on the lower die continuously moves and extrudes an elastic knocking part, so that the elastic knocking part is knocked on the outer side wall of the lower die after shrinkage, the powder in the lower die is further uniformly distributed as far as possible, and for a workpiece needing layering multiple pressing, the problem of lower vibration transmission efficiency when the bottom of the lower die is knocked is avoided, and the compaction state of the bottom and the upper part of the workpiece is the same as far as possible.
Description
Technical Field
The invention relates to a powder forming technology, in particular to a powder shaping device.
Background
The powder shaping is mainly used for carrying out accurate shaping treatment on metal or nonmetal powder so as to meet the requirements of different fields on the shape and performance of the material, and mainly comprises the process steps of powder production, compression molding, sintering, post-treatment and the like, wherein the post-treatment steps comprise finish press shaping, surface quenching, infiltration and the like, and the finish press shaping can be carried out by using a shaping machine so as to calibrate the size of certain workpieces with high size requirement precision; the press molding is generally divided into three steps, namely filling, forging and blanking, namely loading weighed and quantified alloy powder into a pressing die disc for leveling, then forging and molding, blanking after molding, and finishing the press molding of the alloy powder to prepare a semi-finished product; in the prior art, in order to make the shaped workpiece have different specific density and performance requirements, different powders are pressed for multiple times to form a powder metallurgy part with a multi-layer structure.
If the authority notice number is CN112935253B, the authority notice date is 2022, 01 and 28, the patent application of the forging and forming processing equipment for tungsten-cobalt alloy powder is named, and the device comprises a central shaft, a vibration filler component and a vibration driving component; the central shaft is rotationally connected with a processing rotating disc, and the peripheral surface of the processing rotating disc is radially provided with three connecting frames, and the included angle between any two adjacent connecting frames is 120 degrees. According to the invention, the three clamp pieces are connected at equal angles on the peripheral side of the processing rotating disc to clamp the pressing die disc, the processing rotating disc is matched with the connecting frames to drive the three clamp pieces to rotate at equal angles periodically, continuous switching operation among three stations of feeding, pressing and discharging is realized, jolt leveling is automatically carried out on tungsten-cobalt alloy powder in the pressing die disc when the feeding is switched to the pressing station, staff is not required to scrape and level by a scraper, the working efficiency is remarkably improved, the distribution of the filler in the pressing die disc is more uniform and smooth, and the quality of pressed products is improved.
For another example, the patent application of the pressing die for powder metallurgy production is issued with the grant number of CN114619029B and the grant date of 2022, 01 and 28, and the patent application is named as a pressing die for powder metallurgy production, which comprises a punch assembly, a die assembly, a vibration assembly and a driving assembly, wherein the die assembly comprises a die holder and a female die which are arranged along a first axial direction, and a die cavity for filling metallurgical powder is defined by the female die and the die holder; the punch assembly comprises a punch sleeve, and the punch sleeve is pressed into the die cavity along the first axial direction to press and shape metallurgical powder; the vibration assembly comprises a knocking structure and a fluted disc, the fluted disc is arranged on the female die, the fluted disc can rotate around the first axial direction and can synchronously slide with the female die along the first axial direction, and the driving assembly drives the fluted disc to rotate around the first axial direction; the knocking structure knocks the fluted disc when the fluted disc rotates, so that the female die is promoted to vibrate, the vibration effect is exerted on powder in the die cavity by the side wall of the female die, the metallurgical powder is distributed in the die cavity as uniformly as possible, the metallurgical powder in the die cavity is compacted uniformly by the punch sleeve, and the performance of the pressed compact is improved.
In order to ensure uniform powder distribution in the lower die and avoid the situation of partial uncompacted, in the prior art, a mode of knocking and vibrating the bottom of the lower die is generally adopted to ensure uniform powder distribution, however, when the bottom of the lower die is knocked and vibrated for a workpiece needing layering and repeated pressing, the efficiency of transmitting vibration to the upper side of the lower die is lower due to the fact that the pressed part of the workpiece exists in the lower die, and then the condition that the compaction state of the bottom and the upper part of the workpiece are different can be caused.
Disclosure of Invention
The object of the present invention is to provide a powder shaping device which solves the above-mentioned drawbacks of the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
The powder shaping device comprises a lower die and an upper die for providing pressing force, wherein the lower die is rotatably arranged on a base, a plurality of convex blocks positioned in the same horizontal plane are fixedly connected to the outer side wall of the lower die, the powder shaping device also comprises an elastic knocking part fixedly connected to the base, the elastic knocking part and the convex blocks are correspondingly arranged, and a driving mechanism drives the lower die to rotate;
when the lower die rotates, the bump presses the elastic knocking part and enables the elastic knocking part to knock on the outer side wall of the lower die.
According to the powder shaping device, the lower die and the upper die are correspondingly matched, the lower die is internally provided with the forming cavity, and the shape of the upper die is the same as that of the forming cavity.
The utility model provides a powder shaping device, a plurality of spacing posts are installed to the base upper end, slidable mounting has the movable plate on the spacing post, spacing post top rigid coupling has the mounting panel, the hydraulic part is installed to the mounting panel upper end, the movable end of hydraulic part slides and runs through the mounting panel and the rigid coupling is on the movable plate.
According to the powder shaping device, the upper die is detachably arranged at the bottom of the movable plate through the punch.
The powder shaping device comprises a driving mechanism, wherein the driving mechanism comprises a connecting shaft which is rotatably arranged on a base in a penetrating mode, an installation seat is fixedly connected to the upper end of the connecting shaft, the lower die is detachably arranged on the installation seat, a driving motor is fixedly arranged at the lower end of the base, and the output end of the driving motor is fixedly connected with the connecting shaft.
According to the powder shaping device, the elastic knocking part is the spring rod, the elastic knocking part is the fixed section and the movable section, and the movable section of the spring rod is attached to the outer side wall of the lower die.
In the powder shaping device, one end of the bump, which is contacted with the elastic knocking part, is an inclined plane.
According to the powder shaping device, the plurality of groups of protruding blocks are arranged on the outer side wall of the lower die from top to bottom, and each group of protruding blocks are located in the same horizontal plane.
The powder shaping device comprises a base, wherein a first electric push rod is fixedly arranged on the base, a moving part is fixedly arranged on the first electric push rod, an elastic knocking part is arranged on the moving part, and the first electric push rod is used for driving the elastic knocking part to move up and down.
According to the powder shaping device, when the elastic knocking parts are located at different horizontal planes, the elastic knocking parts are in contact with the protruding blocks of the different horizontal planes and knock the outer side walls of the lower die of the different horizontal planes.
In the technical scheme, the powder shaping device provided by the invention has the advantages that the powder in the lower die is close to the inner side wall of the lower die under the action of centrifugal force through rotating the lower die, so that the powder is uniformly distributed, at the moment, the convex blocks on the lower die continuously move and squeeze the elastic knocking parts, so that the elastic knocking parts are knocked on the outer side wall of the lower die after shrinkage, the powder in the lower die is further uniformly distributed as far as possible, and the problem of lower vibration transmission efficiency when the bottom of the lower die is knocked is avoided for a workpiece needing layering multiple times of pressing, so that the compaction state of the bottom and the upper part of the workpiece is the same as far as possible.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic perspective view of a powder shaping device according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a powder shaping device according to an embodiment of the present invention.
Fig. 3 is a partial cross-sectional view of a powder shaping device according to another embodiment of the present invention.
Fig. 4 is a schematic perspective view of a lower die according to another embodiment of the invention.
Fig. 5 is a partial cross-sectional view of a powder shaping device according to yet another embodiment of the present invention.
Fig. 6 is a cross-sectional view taken at X of fig. 5 in accordance with the present invention.
Fig. 7 is a cross-sectional view of a vibration mechanism provided in accordance with yet another embodiment of the present invention.
Fig. 8 is a schematic perspective view of a fixed circular plate and a squeeze block according to still another embodiment of the present invention.
Reference numerals illustrate:
1. A lower die; 11. a bump; 12. forming a cavity; 13. an annular friction part; 2. an upper die; 21. a punch; 22. a vibration mechanism; 221. a rotation shaft; 222. fixing the circular plate; 223. extruding a block; 224. mounting a circular plate; 225. a slip groove; 226. a slide block; 227. an extrusion shaft; 228. a return spring; 229. an elastic vibrating block; 230. a limit spring; 231. a clamping hole; 3. a base; 31. a limit column; 32. a moving plate; 33. a mounting plate; 34. a hydraulic member; 35. a first electric push rod; 36. a moving part; 37. a second electric push rod; 4. an elastic knocking part; 41. a spring rod; 411. a fixed section; 412. a movable section; 413. a connecting spring; 5. a driving mechanism; 51. a connecting shaft; 52. a mounting base; 53. and driving the motor.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1-8, the powder shaping device provided by the embodiment of the invention comprises a lower die 1 and an upper die 2 for providing pressing force, wherein the lower die 1 is rotatably installed on a base 3, a plurality of protruding blocks 11 positioned in the same horizontal plane are fixedly connected to the outer side wall of the lower die 1, the powder shaping device further comprises an elastic knocking part 4 fixedly connected to the base 3, the elastic knocking part 4 and the protruding blocks 11 are correspondingly arranged, and a driving mechanism 5 drives the lower die 1 to rotate; when the lower die 1 rotates, the projection 11 presses the elastic striking portion 4 and strikes the outer side wall of the lower die 1.
In this embodiment, an inner concave portion is formed in the lower die 1 for containing powder, the outer shape of the lower die 1 may be a cylinder or a polygon, the shapes of the upper die 2 and the lower die 1 are adapted to each other, the upper die 2 may move in a vertical direction and be pressed into the lower die 1, and the powder in the lower die 1 is extruded and shaped; the bump 11 can be hemispherical or trapezoid, preferably trapezoid, so that the bump 11 can be conveniently pressed against the elastic knocking part 4 step by step, the bump 11 cannot be blocked by the elastic knocking part 4 in the moving process, the bump 11 also has certain elasticity, preferably made of rubber materials, and the preferable arrangement position of the bump 11 is located in the middle of the outer side wall of the lower die 1; the elastic knocking part 4 is a telescopic elastic piece with certain connecting strength, preferably an elastic telescopic rod, the elastic knocking part 4 can be extruded when the convex block 11 is gradually contacted with the elastic knocking part 4, and the elastic knocking part 4 is knocked on the outer side wall of the lower die 1 under the elastic action of the elastic knocking part 4 when the convex block 11 is gradually separated from the elastic knocking part 4; in this embodiment, the lower die 1 may be driven to rotate during the powder conveying process, so that the powder deposited in the middle position in the lower die 1 may be moved in a direction close to the inner side wall of the lower die 1, so that the powder is prevented from being deposited in the middle part, and at this time, the bump 11 rotates and presses the elastic striking portion 4 according to the rotation of the lower die 1, the elastic striking portion 4 is driven to strike the elastic striking portion 4 on the outer side wall of the lower die 1 by the passive driving of the elastic striking portion 4, and the powder in the lower die 1 is vibrated and compacted by the striking vibration, so that the powder is fully contacted and uniformly distributed as much as possible.
In still another embodiment of the present invention, the lower die 1 and the upper die 2 are correspondingly matched, the shape and size of the upper die 2 are the same as those of the forming cavity 12, the forming cavity 12 (i.e. concave part) is formed in the lower die 1, the forming cavity 12 is used for containing powder, and the upper die 2 can move downwards and enter the forming cavity 12 to squeeze and shape the powder.
In still another embodiment of the present invention, a plurality of limiting columns 31 are installed at the upper end of the base 3, a moving plate 32 is slidably installed on the limiting columns 31, an installation plate 33 is fixedly connected to the top end of the limiting columns 31, a hydraulic part 34 is installed at the upper end of the installation plate 33, the hydraulic part 34 is preferably a hydraulic cylinder, and a movable end of the hydraulic part 34 penetrates through the installation plate 33 in a sliding manner and is fixedly connected to the moving plate 32, and the moving plate 32 is pushed to slide up and down on the limiting columns 31 in a vertical direction by the hydraulic part 34 so as to drive the upper die 2 to move; the upper die 2 is detachably arranged at the bottom of the movable plate 32 through the punch 21, so that the punch 21 and the upper die 2 are convenient to replace, when powder needs to be shaped, the movable plate 32 is driven to move downwards through the hydraulic part 34, so that the movable plate 32 drives the punch 21 and the upper die 2 to move downwards, and the upper die 2 enters the forming cavity 12 to extrude and shape the powder.
In still another embodiment of the present invention, the driving mechanism 5 includes a connecting shaft 51 rotatably penetrating the base 3, an installation seat 52 is fixedly connected to an upper end of the connecting shaft 51, the lower die 1 is detachably installed on the installation seat 52, so as to facilitate the disassembly and replacement of the lower die 1, a driving motor 53 is fixedly arranged at a lower end of the base 3, an output end of the driving motor 53 is fixedly connected with the connecting shaft 51, and the connecting shaft 51 is driven to rotate by the driving motor 53, so that the installation seat 52 rotates along with the lower die 1 and drives the lower die 1 to rotate.
In still another embodiment of the present invention, the elastic knocking portion 4 is a spring rod 41, the elastic knocking portion 4 is divided into a fixed section 411 and a movable section 412, the fixed section 411 is fixedly connected to the base 3 through a supporting portion, the movable section 412 of the spring rod 41 is attached to the outer side wall of the lower die 1, a groove is formed in the fixed section 411, the movable section 412 is slidably mounted in the groove, a connecting spring 413 is connected between the fixed section 411 and the movable section 412, the connecting spring 413 is also located in the groove, when the elastic knocking portion 4 is gradually contacted with the bump 11, the movable section 412 is extruded into the groove to slide and synchronously extrude the connecting spring 413, when the elastic knocking portion 4 is separated from the bump 11, under the elastic action of the connecting spring 413, the movable section 412 extends out and knocks on the outer side wall of the lower die 1, so, when the lower die 1 rotates, the movable section 412 continuously knocks on different positions on the same horizontal plane of the lower die 1, and the peripheral direction of the side wall of the lower die 1 can vibrate to uniformly distribute powder.
In still another embodiment of the present invention, the elastic knocking portion 4 is preferably disposed perpendicular to the outer side wall of the lower die 1, one end of the bump 11, which is in contact with the elastic knocking portion 4, is an inclined plane, the other end of the bump 11, which corresponds to the inclined plane, is a vertical plane, the vertical plane is perpendicular to the outer side wall of the lower die 1, when the bump 11 moves, the inclined plane is in contact with the movable section 412 and extrudes the movable section 412 to shrink inwards, and when the movable section 412 moves to the vertical plane, the movable section 412 can rapidly pop out and knock on the outer side wall of the lower die 1, so as to improve the effect of knocking vibration.
Obviously, for the workpiece needing to be pressed for multiple times in a layering manner, when the middle part of the outer side wall of the lower die 1 is knocked, the knocking vibration effect of the upper side and the lower side of the outer side wall of the lower die 1 is weakened, so that the uniform distribution of powder is not facilitated, therefore, the embodiment provides a further solution, a plurality of groups of protruding blocks 11 are arranged on the outer side wall of the lower die 1 from top to bottom, the protruding blocks 11 are uniformly distributed, each group of protruding blocks 11 are all positioned in the same horizontal plane, and of course, the interval between each group of protruding blocks 11 can be adjusted according to the material to be shaped; the base 3 is fixedly provided with a first electric push rod 35, the first electric push rod 35 is fixedly provided with a moving part 36, the elastic knocking part 4 is arranged on the moving part 36, and the first electric push rod 35 is used for driving the elastic knocking part 4 to move up and down; when the elastic knocking part 4 is positioned at different levels, the elastic knocking part 4 contacts with the convex blocks 11 at different levels and knocks the outer side wall of the lower die 1 at different levels.
When the pressing machine works, namely when layering is performed for multiple times, pressing shaping is performed from the bottommost layer, at this time, the elastic knocking part 4 is also positioned at the bottommost layer, after the partial pressing of the bottommost layer is finished, the moving part 36 is pushed to move upwards by the first electric push rod 35, so that the elastic knocking part 4 moves upwards and stops at the same horizontal plane where a group of lugs 11 above are positioned, pressing is performed again, after the pressing shaping is finished, the steps are repeated, the elastic knocking part 4 is aligned with the lugs 11 of different groups from bottom to top, knocking vibration on all positions of the outer side wall of the lower die 1 is finished, and therefore a vibration source and pressing positions are mutually close to each other, and a vibration effect is ensured.
Further, in some powder compacting processes, friction forces are generated between the powder particles and the inner wall of the lower die 1 and between the particles, as the compacting process proceeds, the powder particles are gradually compacted and approach the inner wall of the lower die 1, resulting in an increase in friction area, and the friction forces are also increased, and this increase in friction force leads to a reduction in compacting force, and consumes part of the compacting force, so that the force actually acting on the powder particles is reduced.
However, in the process of compacting and shaping the powder, the farther the powder is away from the upper die 2, the smaller the pressure the powder is subjected to, which is caused by the characteristics of the compacting mode; since the pressure is affected by the friction force of the side wall and the side stress during the transmission, and the pressure distribution is uneven, the further from the upper die 2, the smaller the pressure is, that is, the further from the upper die 2, the less the lubricant adversely affects the shaping of the powder particles, and the closer to the upper die 2, the more the lubricant adversely affects the shaping of the powder particles, and for this purpose, the effect of rearranging the powder particles in the lower die 1 by striking the outer side wall of the lower die 1 is poor, and further means are provided to solve the above problems, including a vibration mechanism 22 mounted on the upper die 2, it is to be noted that, in this embodiment, the punch 21 is detachably fixed on the moving plate 32, the punch 21 is not fixedly connected with the upper die 2 any more, the vibration mechanism 22 includes a rotation shaft 221 rotatably mounted at the lower end of the punch 21 (an elastic drag reduction unit may be provided between the rotation shaft 221 and the punch 21, ensuring that the rotating shaft 221 can still rotate when the upward pressure is increased, the elastic drag reduction unit in the prior art can be realized through the cooperation of balls and springs, and is not described in detail herein, the upper die 2 is detachably and fixedly connected to the rotating shaft 221, a fixed circular plate 222 is fixedly connected to the punch 21, a plurality of extrusion blocks 223 are fixedly connected to the lower end surface of the fixed circular plate 222 along the circumferential direction of the fixed circular plate 222, the extrusion blocks 223 are of inverted circular table structures, a mounting circular plate 224 is fixedly arranged on the rotating shaft 221, a sliding groove 225 is formed in the mounting circular plate 224, a sliding block 226 is slidably arranged in the sliding groove 225, a limiting spring 230 is connected between the sliding block 226 and the sliding groove 225, the initial position of the sliding block 226 in the sliding groove 225 is ensured through the limiting spring 230, a limiting groove is vertically formed in the sliding block 226, the limiting groove is internally provided with an extrusion shaft 227 in a sliding manner, the extrusion shaft 227 is correspondingly matched with the extrusion block 223, the extrusion shaft 227 can be contacted with the extrusion block 223 to form wedge-shaped matching when the extrusion shaft 227 rotates, the limiting groove is further vertically connected with a containing groove, the extrusion shaft 227 is provided with a limiting block, the limiting block is slidably arranged in the containing groove and is connected with a return spring 228 between the limiting block and the containing groove, the return spring 228 is used for ensuring the initial position of the extrusion shaft 227 in the vertical direction, the upper end of the extrusion shaft 227 can be contacted with the extrusion block 223 when the rotation shaft 221 is used as the center, the bottom of the extrusion shaft 227 is fixedly connected with an elastic vibration block 229, and the elastic vibration block 229 can generate certain deformation and has resilience, and is preferably made of an elastic rubber material.
Specifically, when the upper die 2 enters the forming cavity 12 and presses the powder, the driving motor 53 is started, so that the driving motor 53 drives the lower die 1 to rotate, at this time, because the upper die 2 is pressed on the powder and the powder is pressed on the inner wall of the lower die 1, the static friction force between the upper die 2 and the powder and the static friction force between the powder and the lower die 1 are both larger, the rotation of the lower die 1 can drive the upper die 2 to synchronously rotate (for the lower die 1 with a cylindrical structure, when the lower die 1 and the upper die 2 are both polygons, the rotation of the lower die 1 can directly drive the upper die 2 to synchronously rotate); when the upper die 2 rotates, the rotating shaft 221 synchronously rotates and drives the mounting circular plate 224 to rotate, the mounting circular plate 224 drives the sliding block 226 to rotate, so that the extruding shaft 227 rotates with the rotating shaft 221 as the center of a circle, the extruding shaft 227 gradually contacts with the extruding block 223, the extruding shaft 227 is forced to slide downwards in the limiting groove by the extruding block 223 and compresses the reset spring 228, at the moment, the elastic vibrating block 229 also contacts with the upper end surface of the upper die 2 and is compressed, when the extruding shaft 227 is separated from the extruding block 223, the extruding shaft 227 continuously oscillates up and down in the limiting groove under the elastic action of the reset spring 228, and the elastic vibrating block 229 is driven to continuously oscillate to the upper end of the upper die 2 by the up and down oscillation of the extruding shaft 227 so as to vibrate powder, thereby reducing the adverse influence of lubricant in powder particles under high pressure, and the trend of decreasing the vibration from top to bottom is also consistent with the condition that the lubricant has less adverse influence on powder particle shaping as far away from the upper die 2, and the dynamic pressing mode is beneficial to densifying the powder, and the workpiece is improved.
Still further, as can be seen from the above technical problem, as the compacting and shaping process continues, the pressure to which the powder is subjected gradually increases, in the high pressure stage, since the lubricant is filled in the gaps between the powder particles, but the compactness of the workpiece is hindered, in the above embodiment, the problem that a pressure is extruded on the powder, the pressure distribution of the powder in the vertical direction is uneven, so that the adverse effect caused by the lubricant is brought, but as the powder is gradually compacted and shaped, the pressure of the whole inside the powder also increases, and the above technical problem cannot be solved, therefore, in this embodiment, a further technical scheme is provided, and it is required to be specifically stated that, in this embodiment, the output shaft of the driving motor 53 is no longer fixed with the connecting shaft 51, the connecting shaft 51 is provided with a connecting groove, and the connecting shaft 51 is rotationally sleeved on the output shaft of the driving motor 53 through the connecting groove, but a certain pressure is provided between the two, that is the inner wall of the connecting groove has a certain extrusion force on the output shaft of the driving motor 53, so that when the output shaft of the driving motor 53 rotates, the output shaft of the driving motor can be synchronously driven by the static rotational force; still need carry out further improvement to vibration mechanism 22, the extrusion piece 223 has the multiunit, and the distance between the extrusion piece 223 of different groups and the fixed plectane 222 centre of a circle is different, and the longer the extrusion piece 223 of keeping away from the fixed plectane 222 centre of a circle in vertical direction, a plurality of screens holes 231 have been arranged to the level in the groove 225 that slides, set up screens piece (not shown in the figure) on the slider 226, the screens piece has certain elasticity and can deform, be the joint cooperation between screens hole 231 and the screens piece, do not do too much detailed here, carry out preliminary spacing and stabilize the state of slider 226 to the screens piece through screens hole 231 and extrusion piece 223 quantity unanimously and for corresponding cooperation setting.
It should be noted that, in this embodiment, the elastic knocking portion 4 is no longer fixedly connected to the moving portion 36, a second electric push rod 37 is fixedly connected to the moving portion 36, the elastic knocking portion 4 is detachably and fixedly connected to a movable shaft of the second electric push rod 37, a resistance increasing portion is fixedly connected to one end of the elastic knocking portion 4, which is close to the lower die 1, and has a larger friction coefficient, a plurality of annular friction portions 13 are further installed on the outer side wall of the lower die 1 from top to bottom, the annular friction portions 13 are installed between the bumps 11 of different groups, the moving portion 36 is pushed to move up and down by the first electric push rod 35, so that the elastic knocking portion 4 is aligned with the annular friction portions 13, then the elastic knocking part 4 is pushed by the second electric push rod 37 to be extruded on the annular friction part 13, so that a certain friction force is applied to the lower die 1 by the elastic knocking part 4, and the driving motor 53 drives the connecting shaft 51 to rotate by static friction force, so that when the pressure applied by the elastic knocking part 4 to the annular friction part 13 is increased, the friction force generated by the elastic knocking part 4 to the lower die 1 is increased, and the rotating speed of the lower die 1 is further reduced, otherwise, when the pressure applied by the elastic knocking part 4 to the annular friction part 13 is reduced, the rotating speed of the lower die 1 is increased, and when the rotating speed of the connecting shaft 51 is changed, the rotating speed of the output shaft of the driving motor 53 is unchanged, so that relative rotation occurs between the two parts; after the powder in the lower die 1 is knocked uniformly, the moving part 36 is pushed to rise by the first electric push rod 35, so that the elastic knocking part 4 is aligned with one of the annular friction parts 13, the elastic knocking part 4 is pushed by the second electric push rod 37 to be extruded on the annular friction part 13, and then the pressing and shaping process is carried out.
In the pressing and shaping process, when the upper die 2 enters the lower die 1 and extrudes powder, the driving motor 53 is started, the connecting shaft 51 is driven to rotate by the driving motor 53, but at the moment, the elastic knocking part 4 is pressed on the annular friction part 13 to generate a braking effect, so that the movable shaft of the driving motor 53 and the connecting shaft 51 relatively slide, the rotating speed of the connecting shaft 51 is lower, the rotating speed of the lower die 1 is also lower, at the moment, the elastic vibrating block 229 continuously oscillates to vibrate the upper end of the upper die 2, and as the pressing and shaping operation is carried out, the elastic knocking part 4 is driven to shrink by the second electric push rod 37 to reduce the pressure of the elastic knocking part 4 on the annular friction part 13, at the moment, the rotating speed of the lower die 1 is increased, the rotating speed of the upper die 2 is also increased, and therefore, the centrifugal force applied to the sliding block 226 is increased, the sliding block 226 slides outwards in the sliding groove 225, the clamping block is clamped into the new clamping hole 231, at this time, the extruding shaft 227 is also contacted with the new extruding block 223 with a longer length in the vertical direction, and the distance that the extruding block 223 presses the extruding shaft 227 to move downwards is increased, that is, the energy storage of the limit spring 230 is increased, when the extruding block 223 is separated from the extruding shaft 227, the extruding shaft 227 oscillates to a larger extent, so that the impact force of the elastic vibrating block 229 on the upper end of the upper die 2 is increased, the vibration force on the powder is larger, that is, when the shaping pressing force of the powder is increased, the friction force of the elastic knocking part 4 and the lower die 1 is reduced, the rotation speed of the lower die 1 and the upper die 2 can be increased, the vibration impact force applied to the upper die 2 is increased, and when the pressure of the powder is gradually increased, the lubricant fills the gaps in the powder particles to hinder the compaction of the workpiece.
Obviously, the elastic knocking part 4 not only has the function of knocking the uniform powder on the outer wall of the lower die 1, but also can limit the speed of the lower die 1 so as to ensure the rotating speed of the lower die 1 in the high-pressure stage and further reduce the adverse effect of the lubricant in the high-pressure stage.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (8)
1. The powder shaping device comprises a lower die and an upper die for providing pressing force, and is characterized in that the lower die is rotatably arranged on a base, a plurality of convex blocks positioned in the same horizontal plane are fixedly connected to the outer side wall of the lower die, and the powder shaping device also comprises an elastic knocking part fixedly connected to the base, wherein the elastic knocking part and the convex blocks are correspondingly arranged, and a driving mechanism drives the lower die to rotate;
when the lower die rotates, the bump presses the elastic knocking part and enables the elastic knocking part to knock on the outer side wall of the lower die;
the upper end of the base is provided with a plurality of limit posts, the limit posts are slidably provided with a movable plate, the top ends of the limit posts are fixedly connected with a mounting plate, the upper end of the mounting plate is provided with a hydraulic part, and the movable end of the hydraulic part is slidably penetrated through the mounting plate and fixedly connected on the movable plate;
the upper die is detachably arranged at the bottom of the movable plate through a punch;
Still including installing the vibration mechanism on last mould, vibration mechanism is including rotating the rotation axis of installing at the drift lower extreme, go up mould detachable rigid coupling on the rotation axis, the rigid coupling has fixed plectane on the drift, the terminal surface has a plurality of extrusion pieces along its circumference rigid coupling under the fixed plectane, the extrusion piece is the round platform type structure of falling, be fixed with the installation plectane on the rotation axis, the groove of sliding has been seted up on the installation plectane, sliding mounting has the slider in the groove of sliding, be connected with spacing spring between slider and the groove of sliding, the spacing groove has been seted up vertically, sliding mounting has the extrusion axle in the spacing groove, the extrusion axle is corresponding cooperation setting with the extrusion piece, still vertical being connected with the holding tank on the spacing groove, be formed with the stopper on the extrusion axle, the stopper slides and sets up in the holding tank just be connected with reset spring between stopper and the holding tank, the bottom rigid coupling of extrusion axle has the elastic vibration piece.
2. The powder shaping device of claim 1, wherein the lower die and the upper die are correspondingly matched, a forming cavity is formed in the lower die, and the shape of the upper die is the same as that of the forming cavity.
3. The powder shaping device according to claim 1, wherein the driving mechanism comprises a connecting shaft rotatably penetrating through the base, an installation seat is fixedly connected to the upper end of the connecting shaft, the lower die is detachably installed on the installation seat, a driving motor is fixedly arranged at the lower end of the base, and the output end of the driving motor is fixedly connected with the connecting shaft.
4. The powder shaping device of claim 1, wherein the resilient striking portion is a spring rod, the resilient striking portion is a fixed section and a movable section, and the movable section of the spring rod is attached to the outer side wall of the lower die.
5. A powder shaping device as claimed in claim 1, wherein the end of the projection that comes into contact with the resilient striking portion is a beveled surface.
6. A powder shaping device according to claim 1, wherein a plurality of sets of bumps are provided on the outer side wall of the lower die from top to bottom, each set of bumps being located in the same horizontal plane.
7. The powder shaping device of claim 6, wherein a first electric putter is fixedly arranged on the base, a moving part is fixedly arranged on the first electric putter, the elastic knocking part is arranged on the moving part, and the first electric putter is used for driving the elastic knocking part to move up and down.
8. A powder shaping device as claimed in claim 7, wherein the resilient striking portion contacts the different level bumps and strikes the different level lower die outer side wall when the resilient striking portion is at the different level.
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