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CN-121972658-A - Single-direction and double-direction powder compression molding hydraulic press and powder product molding method

CN121972658ACN 121972658 ACN121972658 ACN 121972658ACN-121972658-A

Abstract

The invention belongs to the technical field of hydraulic presses, and particularly relates to a single-direction and double-direction powder pressing forming hydraulic press and a powder product forming method. The floating beam is arranged above the lower cross beam assembly, and the die frame assembly comprises an upper die assembly, a lower die assembly, an upper die set, a lower die set, a main cylinder, a floating cylinder, a lower cylinder and a core pulling cylinder; the upper die is arranged in the middle of the movable cross beam, and the lower die is arranged below the floating beam and is aligned with the upper die assembly; the main cylinder, the floating cylinder, the lower cylinder and the core pulling cylinder are configured to be capable of controlled cooperative action so as to realize single-axial or bidirectional compression molding in a cavity formed by the powder together by the female die, the upper die, the lower die and the die core, the invention discloses a single-double-direction powder pressing hydraulic machine, which has the advantages of dual purposes and adaptability to various products and process requirements.

Inventors

  • FU XUEWEN
  • ZENG XUEWEN
  • REN QINGJIAN
  • MA XIAOLIN
  • Hou miao

Assignees

  • 成都正西智能装备集团股份有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (10)

  1. 1. The utility model provides a single two-way powder compacting hydraulic press, includes hydraulic pressure station (35), electric cabinet (36), liquid filling case (37), entablature (4), movable cross beam (3), stand assembly (2), master cylinder (5) and lower beam assembly (1), movable cross beam (3) by master cylinder (5) drive along stand assembly (2) up-and-down motion, its characterized in that still includes: the floating beam (6) is arranged above the lower beam assembly (1), is connected with the upper cross beam (4) through at least one floating cylinder (7) and can vertically move relative to the lower beam assembly (1); the die carrier assembly comprises an upper die assembly, a lower die assembly and a female die (30), wherein the lower die assembly comprises a lower cylinder which is integrated in a lower beam assembly (1) and used for driving the die carrier assembly to integrally lift and a core pulling cylinder which is used for independently driving a die core (31) to perform core pulling movement, and a piston rod of the lower cylinder is in driving connection with the lower end of a die carrier lower ejector rod base plate (13) and/or a connecting rod (32); The upper punching die (28) is arranged in the middle of the movable cross beam (3), and the lower punching die (29) is arranged below the floating beam (6) and is aligned with the upper die assembly; The main cylinder (5), the floating cylinder (7), the lower cylinder and the core pulling cylinder are configured to be capable of controlled and coordinated action so as to realize single-axial or bidirectional compression molding in a cavity formed by the powder together by the female die (30), the upper die (28), the lower die (29) and the die core (31).
  2. 2. The single and double-way powder compression molding hydraulic press of claim 1, wherein the upper die assembly comprises a first upper punching base plate (20), a second upper punching base plate (21) and an upper punching cover (18) for pressing the second upper punching base plate (21) from top to bottom, and the lower die assembly comprises a female die pressing cover (19), a lower die punching cover (11), a lower die punching base plate (16), a die frame fixing plate (8), a die frame lower die plate (9), a lower die frame guide post (10) and a lower die frame push rod (15) which are sequentially arranged from top to bottom, wherein the female die pressing cover (19) is used for fixing the lower die punching cover (11); The die comprises a die set lower guide post (10), a die set lower ejector rod (15) and a die set lower ejector rod backing plate (13) are arranged at the bottom of the die set lower guide post (10), a die set core rod gland (12) and a die core backing plate (17) are arranged between the die set fixing plate (8) and the die set lower die plate (9), the die set core rod gland (12) is fixed above the die core backing plate (17), the die set lower die plate (9) is connected with the die set lower guide post (10) in a guiding mode through a die set-core pulling plate guide sleeve (14), a guide post gland (22) is arranged between the die set lower ejector rod (15) and the die set lower ejector rod backing plate (13), and the lower punching die (29) is installed on the floating beam (6) through a die set lower punching backing plate (16) and a die set lower punching cover (11) and is aligned with a bottom opening of the female die (30).
  3. 3. A single and double direction powder compacting hydraulic press according to claim 1, characterized in that a guiding mechanism is arranged between the floating beam (6) and the lower beam assembly (1), the guiding mechanism comprising a guide post (38) and a guide sleeve which are in sliding fit with each other, wherein the guide post (38) and the guide sleeve are arranged on the lower beam assembly (1) and the floating beam (6), respectively.
  4. 4. A machine according to claim 1, characterized in that the piston rod of the floating cylinder (7) is connected to the floating beam (6) by a transition block assembly comprising a transition block rod portion (26) connected to the piston rod, a transition block flange lower portion (24) connected to the bottom of the floating beam (6), and a transition block flange upper portion (25) connected between the transition block rod portion (26) and the transition block flange lower portion (24) for effecting the transmission and distribution of forces.
  5. 5. The single and double-direction powder pressing forming hydraulic machine according to claim 2, wherein the die frame assembly further comprises a die frame lower guide post (10) which is vertically arranged, the die frame fixing plate (8) is slidably sleeved on the die frame lower guide post (10) through a linear bearing or a guide sleeve, the female die (30) is fixed on the die frame fixing plate (8) through a female die pressing cover (19), and the lower part of the die core (31) is connected with a die core base plate (17) and extends into a cavity of the female die (30) through the die frame lower die plate (9) and the die frame fixing plate (8).
  6. 6. The single and double direction powder compacting hydraulic machine according to claim 4, wherein the lower die plate (9) is provided with a die set-core pulling plate guide sleeve (14), and the die core backing plate (17) is in driving connection with a piston rod of the core pulling cylinder and moves along the die set-core pulling plate guide sleeve (14) in a guiding way.
  7. 7. A single or dual directional powder compaction hydraulic press according to claim 1, further comprising an automated material handling system comprising: The hopper assembly (34) is fixedly arranged on one side of the upper cross beam (4) and corresponds to the floating beam (6) at the lower end, the hopper assembly (34) comprises a charging hopper (341) and a pneumatic butterfly valve (342) for storing powder raw materials, and the pneumatic butterfly valve (342) is fixed at a pipeline discharge port (343) of the charging hopper (341); A pushing mechanism assembly (23) which traverses the surface of the floating beam (6) and is fixed with the left and right sides of the floating beam (6); The pushing mechanism assembly body (23) comprises a pushing hydraulic cylinder mounting seat (231) and a pushing mounting base (232) connected with the pushing hydraulic cylinder mounting seat (231), wherein powder baffle plates (242) are symmetrically arranged on two sides of the pushing mounting base (232), a hopper base (233) is arranged at one end between the two powder baffle plates (242) and is fixed with the pushing mounting base (232), the pushing hydraulic cylinder mounting seat (231) is fixed on one side of a floating beam (6) and is connected with a high-pressure oil cylinder (245), a Y-shaped connector (234) is arranged at the end part of the high-pressure oil cylinder (245), the other end of the Y-shaped connector (234) is fixed with a feeding pushing block (235) through a bolt (243), one side of the feeding pushing block (235) is fixedly connected with a hopper cavity block (236), the front part of the feeding pushing block (235) is provided with a rubber pushing block (237), the hopper base (233) is movably corresponding to the hopper cavity block (236), the hopper base (233) is provided with the floating beam (6), the other side of the floating beam (6) is transversely arranged on the floating beam (239), and the other side of the floating beam (6) is transversely connected with the floating beam (239); The feeding pipe (238) is movably connected with the pipeline discharging hole (343); the motion path of the high-pressure oil cylinder (245) sequentially passes through the lower part of the pipeline discharge hole (343), the charging position above the undershoot die (29) and the upper part of the lateral material receiving box assembly (239) of the floating beam (6).
  8. 8. The machine of claim 7, wherein the front magazine assembly (239) includes a filter screen (240) and a waste powder magazine (241) disposed below the filter screen (240), the filter screen (240) having a mesh size smaller than the powder particle size of the green compact but larger than the basic particle size of the powder feedstock.
  9. 9. A method of powder article forming using the single or double direction powder press forming hydraulic machine of any one of claims 1-8, comprising the steps of: S1, initial resetting, namely controlling the main cylinder (5), the floating cylinder (7), the lower cylinder and the core pulling cylinder to act, so that the movable cross beam (3), the floating beam (6), the die carrier assembly and the die core (31) are all at preset initial positions, and at the moment, the top end surface of the lower punching die (29) is level with or slightly lower than the lower end surface of the female die (30) to form an open charging cavity; S2, quantitatively charging, namely opening a pneumatic butterfly valve (342) of the hopper assembly body (34) to enable powder to fall into a feed pipe (238) of the pushing mechanism assembly body (23), and then controlling the pushing mechanism assembly body (23) to push the powder into the hopper cavity block (236) horizontally; S3, bidirectional pressing, namely synchronously controlling the main cylinder (5) to drive the movable cross beam (3) and the upper die (28) to move downwards at a first speed V1, simultaneously controlling the floating cylinder (7) to drive the floating beam (6) and the lower die (29) to move upwards at a second speed V2, and/or controlling the lower cylinder to drive the die frame assembly and the female die (30) to move upwards at a third speed V3, so that the powder is simultaneously subjected to pressure from the upper direction and the lower direction in the closed die cavity, wherein V1, V2 and V3 are independently set and are different from each other; S4, maintaining pressure and releasing stress, namely after the pressing pressure reaches a preset peak pressure P max , maintaining the pressure for a period of time T, wherein the time T satisfies a relation formula that T is more than or equal to C is ln (P max ), wherein C is a material constant related to the type and granularity of the powder material, and the value range is 0.5-5 seconds/MPa; S5, pressure relief and demoulding, namely sequentially or synchronously reducing the pressure of the main cylinder (5), the floating cylinder (7) and the lower cylinder, controlling the main cylinder (5), the floating cylinder (7), the lower cylinder, the core pulling cylinder and a high-pressure oil cylinder (245) in a pushing mechanism assembly body (23) to retract according to a preset demoulding sequence, enabling the upper die (28) to separate from a pressed compact finished product, enabling the female die (30) to descend, and enabling the lower die (29) to eject the pressed compact finished product to be above the upper end surface of the female die (30); s6, removing the finished product and separating the waste powder, namely controlling the floating cylinder (7) to drive the floating beam (6) to descend so that the pressed compact finished product stably falls on the bearing surface of the floating beam (6), then controlling the pushing mechanism assembly (23) to push the pressed compact finished product out of the filter screen (240) horizontally, and screening and collecting loose waste powder attached to the surface of the pressed compact finished product through the filter screen (240) in the pushing process or when the pressed compact finished product reaches the filter screen (240) in the waste powder receiving box (241).
  10. 10. The method for forming a powder product by a single or double direction powder compacting hydraulic press according to claim 9, wherein during the double direction compacting process of step S3, the first speed V1 is adjusted stepwise according to the ratio of the charge height H to the equivalent diameter D of the green compact product, specifically comprising: S31, adjusting the speed of the upper die (28) in stages, wherein the first speed V1 is adjusted in stages according to the following sequence: (a) And in the pre-pressing stage, when the pressing pressure is lower than a preset threshold pressure P th , adopting a pre-pressing speed V1 a , wherein the calculation formula is as follows: Wherein k1 is a pre-pressing speed coefficient, and the value range is 0.1-0.5 mm/s; (b) And a main pressure stage, namely switching to a main pressure speed V1 b after the pressing pressure reaches or exceeds the threshold pressure P th , wherein the calculation formula is as follows: wherein beta is a main pressure speed amplification factor, and the value range of beta is 3-10; (c) And the final pressure and pre-pressure maintaining stage, namely when the pressing pressure is close to the preset peak pressure P max and meets the requirement that P max -P current is less than or equal to delta P, wherein P current is real-time pressure, delta P is a set pressure difference value, the range is 5% -15% P max , the final pressure speed V1 c is switched, and the calculation formula is as follows: Wherein, gamma is a final pressure deceleration coefficient, and the value range is 0.2-0.8; s32, controlling the cooperative speed of the lower die (29) and the female die (30): The second speed V2 of the floating cylinder (7) and/or the third speed V3 of the lower cylinder are controlled according to any one of the following strategies: Strategy A, carrying out real-time following on the first speed V1 according to a preset upper punch and lower punch synchronous displacement curve or a speed proportional relation; The strategy B is that according to a preset upper and lower pressing ratio relation R F ,R F =F lower /F upper , V2 and/or V3 are/is adjusted in real time through closed loop feedback, so that the real-time pressing ratio is close to R F , wherein R F represents an upper and lower pressing ratio example coefficient, F upper represents the pressing force exerted by an upper die (28), and F lower represents the pressing force exerted by a lower die (29) and/or a female die (30); strategy C, controlling according to a preset speed curve independent of V1; S33, determining key process parameters, wherein the value of the threshold pressure P th is related to the compression characteristic of the powder, the value is the pressing pressure required when the relative density of the powder reaches 50% -70%, the pre-pressing speed coefficient k1 is determined by the basic physical property of the powder, and the calculation formula is as follows: Wherein ρ0 is the bulk density of the powder (unit: g/cm 3), t is the Hall flow rate of the powder (unit: s/50 g), λ is the calibration constant of the equipment and the process system, and the value range is 0.05-0.2 (mm cm 3)/(g s).

Description

Single-direction and double-direction powder compression molding hydraulic press and powder product molding method Technical Field The invention belongs to the technical field of hydraulic presses, and particularly relates to a single-direction and double-direction powder compression molding hydraulic press and a powder product molding method. Background The single-direction and double-direction powder pressing forming hydraulic machine is a high-end forming device with strong function and wide process adaptability. The method greatly improves the quality of pressed billets, particularly the density uniformity, by flexibly selecting the pressing mode, while ensuring the production efficiency, and is essential equipment for manufacturing high-performance powder metallurgy products and advanced ceramic parts. The core advantage of the single-direction and double-direction powder pressing forming hydraulic machine is that by providing the double-direction pressing force Guan Jianneng, the industrial problem of uniformity of the density of the powder pressed compact is fundamentally solved, and thus powder metallurgy and ceramic products with higher quality, more complexity and more excellent performance are produced. Meanwhile, the flexible process adaptability makes the process become an ideal choice for coping with diversified production demands, and the initial investment is high, but the process has the value in the aspects of improving the product quality, the qualification rate and the production flexibility, so that the process becomes the first-choice equipment in the field of high-end powder molding. With the development of servo driving and intelligent technology, the performance and application range of the system are further expanded. In recent years, with the rapid promotion of industrialization and the vigorous growth of modern manufacturing industry, the importance of hydraulic presses as key production equipment is increasingly highlighted. In the field of manufacturing, hydraulic presses are used as one of the traditional industrial basic devices, and the application range of the hydraulic presses is extremely wide. According to different required finished products, the corresponding mould can be replaced for compression molding. Therefore, the invention discloses a single-double-direction powder pressing forming hydraulic machine, which is two-purpose and can meet the requirements of various products and processes. The bidirectional pressing mode can produce complex parts with high density and high uniformity. The hydraulic press can easily realize the pressing force of thousands of tons or even tens of thousands of tons, and is suitable for large and high-density products. The working stroke is large, and the device is suitable for pressing higher blanks. The pressure maintaining is easy to realize, the release of elastic internal stress among powder particles is facilitated, and cracks and rebound are reduced. Disclosure of Invention The utility model provides a single two-way powder compacting hydraulic press, includes hydraulic station, electric cabinet, liquid charging case, entablature, movable cross beam, stand assembly, master cylinder and bottom end rail assembly, movable cross beam by the master cylinder drive is along stand assembly up-and-down motion, still includes: The floating beam is arranged above the lower beam assembly, is connected with the upper cross beam through at least one floating cylinder and can move vertically relative to the lower beam assembly; The die carrier assembly comprises an upper die assembly, a lower die assembly and a female die, wherein the lower die assembly comprises a lower cylinder which is integrated in a lower beam assembly and is used for driving the die carrier assembly to integrally lift and fall, and a core pulling cylinder which is used for independently driving a die core to perform core pulling movement, and a piston rod of the lower cylinder is in driving connection with a die carrier lower ejector rod base plate and/or the lower end of the connecting rod; The upper die set is arranged in the middle of the movable cross beam, and the lower die set is arranged below the floating beam and is aligned with the upper die assembly; the main cylinder, the floating cylinder, the lower cylinder and the core pulling cylinder are configured to be capable of controlled cooperative action so as to realize single-axial or bidirectional compression molding of powder in a cavity formed by the female die, the upper punching die, the lower punching die and the die core. The die comprises a die pressing cover, a die lower punching pad plate, a die frame fixing plate, a die frame lower die plate, a die frame lower guide post and a die frame lower ejector rod, wherein the die pressing cover is used for fixing the die lower punching cover; A die core rod gland and a die core backing plate are arranged between the die frame fixing plate and the die frame lower