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CN-121988740-A - Compression molding device for hard alloy production and manufacturing

CN121988740ACN 121988740 ACN121988740 ACN 121988740ACN-121988740-A

Abstract

The application relates to the technical field of metal powder processing, and discloses a compression molding device for hard alloy production and manufacturing, which sequentially comprises a hydraulic cylinder, a pressing table, an inner pressing table, an outer pressing table, a female die table and a guide rod for stringing the two tables together from top to bottom, wherein the hydraulic cylinder is connected with a portal, a core rod is arranged below the female die table, the core rod is connected with a base, and the pressing table is connected with the inner pressing table and the outer pressing table through alternate driving pieces. The compression molding device for hard alloy production and manufacturing realizes alternate small-amplitude downward pressing of the inner stamping table and the outer stamping table through the alternate driving piece, and strictly limits the movement amount of powder in single pressing, so that the problem of uneven density of hard alloy parts with complex structures during pressing is solved, and meanwhile, the debugging difficulty and the die damage risk are reduced.

Inventors

  • WANG GUOYUAN
  • SHU YANBING
  • TIAN ZHENG

Assignees

  • 抚州金石新材料有限公司

Dates

Publication Date
20260508
Application Date
20260310

Claims (9)

  1. 1. The utility model provides a hard alloy production is made with suppression forming device from top to bottom, includes pneumatic cylinder (3), platform (4), interior punching press platform (5), outer punching press platform (6) and female die platform (7) and with their guide bar (10) that are in the same place in proper order, pneumatic cylinder (3) are connected with portal (2), the below of female die platform (7) is equipped with core bar (8), and core bar (8) are connected with base (1), its characterized in that: The pressing table (4) is connected with the inner pressing table (5) and the outer pressing table (6) through alternate driving pieces (9), and the alternate driving pieces (9) alternately drive the inner pressing table (5) and the outer pressing table (6) to move so that the inner pressing table (5) and the outer pressing table (6) alternately press down.
  2. 2. The press forming device for producing and manufacturing hard alloy according to claim 1, wherein the alternating driving member (9) comprises a first driving rod (921) and a second driving rod (922), the first driving rod (921) and the second driving rod (922) are communicated with a power source, and pulse valves which are not synchronous with each other are arranged between the first driving rod (921) and the second driving rod (922).
  3. 3. The compression molding device for hard alloy production and manufacturing according to claim 1, wherein the alternate driving piece (9) comprises a first telescopic rod (911) and a second telescopic rod (912), the outer punching table (6) is connected with the punching table (4) through the first telescopic rod (911), the inner punching table (5) is connected with the punching table (4) through the second telescopic rod (912), the first telescopic rod (911) and the second telescopic rod (912) are communicated with an oil storage tank (915) through communicating pipes (913), the oil storage tank (915) is communicated with the communicating pipes (913) through two-position three-way valves (914), and the valve cores of the two-position three-way valves (914) continuously rotate to enable the oil storage tank (915) to be alternately communicated with the two groups of communicating pipes (913).
  4. 4. A press forming device for hard alloy production and manufacturing according to claim 2 or 3, characterized in that the inner stamping table (5) and the outer stamping table (6) are provided with a limit rod (13), the limit rod (13) penetrates through the inner stamping table (5) and the outer stamping table (6), both ends of the limit rod are provided with limit positions, and a first cushion block (15) is arranged between the inner stamping table (5) and the outer stamping table (6).
  5. 5. A press forming device for cemented carbide production according to claim 4, characterized in that the space of the inner and outer punches reaches exactly the size of the press when the inner (5) and outer (6) press the first pad (15).
  6. 6. The compression molding device for hard alloy production and manufacturing according to claim 4, wherein a second cushion block (16) corresponding to the end face of the female die platform (7) is arranged at the lower end of the outer punching table (6), a proximity sensor is arranged on the second cushion block (16), when the proximity sensor senses a signal, the outer punching table (6) stops moving, and the inner punching table (5) continues moving until the pressing is in place.
  7. 7. A press forming device for producing cemented carbide according to claim 3, characterized in that the communication pipe (913) is provided with a throttle valve, the throttle capacity of which can be adjusted.
  8. 8. The compression molding device for hard alloy production and manufacturing according to claim 7, wherein pressure sensors are arranged in the first telescopic rod (911) and the second telescopic rod (912), and when the pressure sensors detect that the pressure exceeds a threshold value, the controller triggers the pressing table (4) to stop moving, and the two-position three-way valve (914) keeps running continuously.
  9. 9. A press forming device for producing and manufacturing cemented carbide according to claim 3, characterized in that the guide rod (10) is provided with a second baffle (12) corresponding to the inner punching stage (5), the communicating pipe (913) is provided with a branch pipe which bypasses the two-position three-way valve (914) and is directly communicated with the oil storage tank (915), and the branch pipe is provided with a one-way valve. .

Description

Compression molding device for hard alloy production and manufacturing Technical Field The application relates to the technical field of metal powder processing, in particular to a compression molding device for hard alloy production and manufacturing. Background The hard alloy is used as a high-performance structural material and is widely applied to the fields of cutting tools, mining tools, wear-resistant parts and the like. The pressing forming is a key process in the production process, namely, the evenly mixed hard alloy powder is quantitatively filled into a die cavity, and tens to hundreds of megapascals of pressure is applied by a punch, so that powder particles are rearranged, plastically deformed and mechanically meshed, and a green body with certain strength and shape is formed. The uniformity of the green density distribution directly determines the mechanical properties, dimensional accuracy and service life of the sintered product. When hard alloy parts (such as a stepped drill bit and a multi-stage die core) with complex structures such as axial steps, annular bosses and the like are pressed, the powder flow path difference is obvious due to abrupt change of the section. The traditional single punch pressing is easy to cause the problems of insufficient filling of the step root, overpressure cracking of the top and the like. In order to improve density distribution, a floating type multi-punch collaborative pressing technology is commonly adopted in the industry, wherein an inner punch and an outer punch which can move independently and axially are arranged for an inner step structure and an outer step structure and are driven by independent cylinders respectively. When the punches contact powder, each punch moves down in a self-adaptive mode according to local powder resistance, the stepped areas with different heights can be synchronously pressed theoretically, and density gradient caused by pressure transmission attenuation is reduced. However, this prior art exposes significant drawbacks in practical applications: First, because the inner and outer punches are controlled by completely independent pneumatic systems, their motion speeds lack dynamic coupling to the pressurization sequences. When a punch (such as an outer punch) moves too fast due to higher air pressure or smaller response delay, powder in a contact area can be strongly extruded to an adjacent area (such as an inner step cavity), so that the powder is locally accumulated or pumped out, the density distribution is increased, the quality of a pressed blank is not only affected, but also the local pressure is too high when the pressure is severe, and the die is damaged. Next, in order to suppress the above-mentioned problems, the operator needs to repeatedly adjust the pressure setting values of the two cylinders, the throttle opening and the operation timing, and perform "trial and error" debugging depending on experience. The optimization of single process parameters is long in time consumption, the requirements on the skills of operators are severe, the quality of the batch is fluctuated due to tiny fluctuation of the parameters, and stable mass production is difficult to realize. Disclosure of Invention The application provides a compression molding device for hard alloy production and manufacturing, which realizes alternate small-amplitude downward pressing of an inner pressing table and an outer pressing table through alternate driving parts and strictly limits the movement amount of powder in single pressing, thereby solving the problem of uneven density when hard alloy parts with complex structures are pressed, and reducing debugging difficulty and die damage risk. The application adopts the following technical scheme that the compression molding device for producing and manufacturing hard alloy sequentially comprises a hydraulic cylinder, a pressing table, an inner pressing table, an outer pressing table, a female die table and a guide rod for stringing the two tables together from top to bottom, wherein the hydraulic cylinder is connected with a portal, a core rod is arranged below the female die table, the core rod is connected with a base, the pressing table is connected with the inner pressing table and the outer pressing table through alternate driving pieces, and the alternate driving pieces alternately drive the inner pressing table and the outer pressing table to move so as to enable the inner pressing table and the outer pressing table to alternately press down. Further, the alternate driving piece comprises a first driving rod and a second driving rod, the first driving rod and the second driving rod are communicated with a power source, and pulse valves which are not synchronous with each other are arranged between the first driving rod and the second driving rod. Further, the alternate driving piece includes first telescopic link and second telescopic link, and outer stamping table is connected with the st