Tungsten powder compression molding system for tungsten precision cutter blank machining

Abstract

The invention relates to the technical field of metal powder compaction equipment, and discloses a tungsten powder compression molding system for tungsten precision cutter blank machining, which comprises a stamping part, the stamping part is connected with a female die in a clamping manner, and the stamping part comprises a male die adopting a trapezoidal design; a rubber strip making contact with the inner wall of the female die is arranged at the upper end of the side edge of the male die, a sealing structure is arranged on the side edge of the male die and comprises a movable groove, an arc-shaped plate is embedded in the movable groove in the initial state, and the inner wall of the arc-shaped plate is attached to the outer surface of a circular shaft of the eccentric wheel. The eccentric wheel is arranged, the trapezoid male die is in the shape with the wide upper portion and the narrow lower portion, the area of the bottom end of the male die can be increased through rotation of the eccentric wheel, the male die can better adapt to different pressing requirements, and in the pressing process, more uniform pressure can be applied to tungsten powder by changing the contact area of the male die and the female die; and the density uniformity and the quality stability of the pressed product can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal powder compaction equipment, and particularly relates to a tungsten powder compaction system for processing tungsten-made precision tool blanks. Background Art

[0002] Powder metallurgy technology is an industrial technology for producing metal powders or using metal powders as raw materials, and through forming and sintering, producing metal materials, composite materials, and various types of products. After mixing tungsten powder with other additives, the tungsten powder is precisely pressed into a tool blank with a specific shape and dimensional accuracy by a pressing mechanism, and the tungsten powder particles are closely packed with each other, laying a foundation for subsequent processing and manufacturing.

[0003] In actual production, when the punch presses down on the die carrying tungsten powder, due to factors such as limitations in mold processing accuracy, the existence of assembly gaps, and non-optimal pressing process parameters, some tungsten powder will spray out from the mold gap. The sprayed powder mainly comes from the edge area of the mold cavity, resulting in a local decrease in powder loading density in this area, making the blank show a non-uniform structure with low density at the edge and high density in the center after pressing. This density gradient will induce warping or cracking defects due to differential shrinkage during the subsequent sintering process. In addition, the sprayed powder adheres to the upper surface of the mold, and in the output link after the blank is formed, it will increase the friction between the mold and the blank and interfere with the demolding process. Summary of the Invention

[0004] Technical Problems to be Solved Aiming at the above-mentioned disadvantages of the prior art, the present invention provides a tungsten powder compaction system for processing tungsten-made precision tool blanks, which can effectively solve the problem that the powder at the edge of the mold cavity in the prior art is likely to spray out through the mold gap during the downward pressing process.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: The present invention provides a tungsten powder compaction system for processing tungsten-made precision tool blanks, including: a die; a stamping part, the stamping part is snap-connected to the die. The stamping part includes a punch with a trapezoidal design. A rubber strip in contact with the inner wall of the die is arranged at the upper end position of the side of the punch, and a sealing structure is arranged on the side of the punch; a downward pressing mechanism, the downward pressing mechanism is located at the top of the stamping part; The sealing structure includes a movable groove. Initially, an arc-shaped plate is embedded in the movable groove. The inner wall of the arc-shaped plate fits with the outer surface of the eccentric wheel shaft. A wedge plate is arranged at the bottom end of the eccentric wheel. The movement of the wedge plate drives the eccentric wheel to rotate. The eccentric wheel exerts an effect on the arc-shaped plate, causing it to move out of the inner wall of the punch and approach the inner wall of the die; Among them, the sealing structure further includes side plates fixed to the bottom ends of the outer walls of the arc-shaped plates, and the side plates move with the arc-shaped plates to fit together.

[0006] Furthermore, a positioning groove is provided at the upper end inside the female mold, and a sealing member is arranged on the inner wall of the positioning groove. The sealing member includes a fixed shaft hinged to the side of the inner wall of the positioning groove, a fixing plate is fixedly connected to the outer wall of the fixed shaft, and a sealing strip is arranged on the side of the fixing plate.

[0007] Furthermore, the pressing mechanism includes a pressing frame electrically connected to the sensor inside the rubber strip, and a pressing plate fixedly connected to the bottom end of the pressing frame and fitting against the side of the wedge plate.

[0008] Furthermore, sliding grooves slidably connected to the pressing plate are symmetrically provided at the top end of the male mold. A channel for facilitating the movement of the wedge plate is provided at the lower part of the sliding groove, and the wedge plate is designed with symmetrically inclined tops.

[0009] Furthermore, movable shafts are fixedly connected to both ends of the arc-shaped plate, and the movable shafts are slidably connected to grooves formed in the inner wall of the male mold. The grooves are composed of a horizontal groove and an inclined groove.

[0010] Furthermore, a fixing frame is arranged on the outer wall of the movable shaft, and a telescopic spring is arranged on one side of the fixing frame close to the sliding groove.

[0011] Furthermore, the side of the side plate is designed with an inclined edge, and a flexible layer is arranged on the inclined surface. The heights of adjacent side plates are different, and the heights of symmetric side plates are the same.

[0012] The technical solution provided by the present invention has the following beneficial effects compared with the prior art: The present invention is provided with an eccentric wheel. The trapezoidal male mold has a shape that is wider at the top and narrower at the bottom. The rotation of the eccentric wheel can increase the area of the bottom end of the male mold, enabling the male mold to better adapt to different pressing requirements. During the pressing process, by changing the contact area between the male mold and the female mold, more uniform pressure can be applied to the tungsten powder, which helps to improve the density uniformity and quality stability of the pressed product; The rotation of the eccentric wheel can drive the movement of the sealing structure, enabling the sealing structure to better fit the inner wall of the female mold, forming a good sealing effect, preventing tungsten powder from leaking from the gap between the male mold and the female mold during the pressing process, ensuring the cleanliness of the pressing environment, and at the same time avoiding material waste and equipment pollution caused by tungsten powder leakage; During the rotation of the eccentric wheel, the side of it can frictionally clean the bottom end of the sealing strip at the upper end of the inner wall of the female mold. This function can timely remove tungsten powder particles attached to the sealing strip, prevent tungsten powder accumulation from affecting the sealing effect, extend the service life of the sealing strip, and thus ensure the reliability and stability of the entire sealing system; After the pressing is completed, when the punch rises, the eccentric wheel returns to its initial position, restoring the lower position of the punch to its original position, reducing the contact area and friction between the punch and the pressed product, facilitating the removal of the punch from the pressed product, reducing the risk of cracks, deformation or surface damage to the green body due to excessive demolding force, being conducive to improving the yield and quality of the green body, and at the same time making it more convenient to disassemble the mold and perform subsequent maintenance work, improving production efficiency and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 Schematic diagram of the separated structure of the female die and the male die of an embodiment of the present invention; Figure 3 Schematic diagram of the structure of the female die of an embodiment of the present invention; Figure 4 Schematic diagram of the structure of the seal of an embodiment of the present invention; Figure 5 Schematic diagram of the structure of the male die of an embodiment of the present invention; Figure 6 Schematic cross-sectional view of the internal structure of the male die of an embodiment of the present invention; Figure 7 Schematic diagram of the structure of the arc plate of an embodiment of the present invention.

[0015] The reference numerals in the figures respectively represent: 1, female die; 11, positioning groove; 12, seal; 121, sealing strip; 122, fixing plate; 123, fixed shaft; 2, stamping part; 21, male die; 22, rubber strip; 23, sealing structure; 231, movable groove; 232, arc plate; 233, side plate; 234, fixing frame; 235, telescopic spring; 236, movable shaft; 237, eccentric wheel; 238, inclined wedge plate; 24, sliding groove; 25, groove; 3, downward pressing mechanism; 31, pressing frame; 32, pressing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] The present invention will be further described below with reference to the embodiments.

[0018] Embodiment:

[0019] Please refer to Figures 1 - 7 , the present invention provides a technical solution for a tungsten powder compaction and molding system for processing tungsten-based precision tool blanks: Refer to Figure 1 and Figure 2 , the device includes a stamping part 2, a concave die 1, and a downward pressing mechanism 3. The downward pressing mechanism 3 is located at the top of the stamping part 2. The downward pressing mechanism 3 includes a pressure application frame 31. A pressing plate 32 is fixedly connected to the bottom end of the pressure application frame 31. The stamping part 2 is snap-fitted with the concave die 1. The stamping part 2 includes a convex die 21 designed in a trapezoid shape. A rubber strip 22 in contact with the inner wall of the concave die 1 is arranged at the upper side position of the side of the convex die 21. A sensor is arranged inside the rubber strip 22 to control the movement of the pressure application frame 31 when it is under pressure. A sealing structure 23 is arranged at the side of the convex die 21.

[0020] Refer to Figure 5 , Figure 6 and Figure 7 , the sealing structure 23 includes a movable groove 231. Initially, an arc-shaped plate 232 is embedded inside the movable groove 231. The inner wall of the arc-shaped plate 232 is attached to the outer surface of the round shaft of the eccentric wheel 237. A wedge plate 238 is arranged at the bottom end of the eccentric wheel 237. The wedge plate 238 is designed with symmetrically inclined tops. The movement of the wedge plate 238 drives the eccentric wheel 237 to rotate. The eccentric wheel 237 exerts an effect on the arc-shaped plate 232, causing it to move out of the inner wall of the convex die 21 and approach the inner wall of the concave die 1. Both ends of the arc-shaped plate 232 are fixedly connected with movable shafts 236. The movable shafts 236 are slidably connected to the grooves 25 opened on the inner wall of the convex die 21. The grooves 25 are composed of a horizontal groove and an inclined groove; The sealing structure 23 further includes a side plate 233 fixed to the bottom end of the outer wall of the arc-shaped plate 232. The side plates 233 move with the arc-shaped plate 232 to fit against each other. The sides of the side plates 233 are designed with bevel edges, and a flexible layer is provided on the inclined surface. The heights of adjacent side plates 233 are different, and the heights of the symmetric side plates 233 are the same. Symmetrically arranged chutes 24 for sliding connection with the pressing plate 32 are provided at the top end of the punch 21. A channel for facilitating the movement of the inclined wedge plate 238 is provided at the lower part of the chute 24. A fixing frame 234 is provided on the outer wall of the movable shaft 236, and a telescopic spring 235 is provided on the side of the fixing frame 234 close to the chute 24. During the use process, the bottom end of the punch 21 contacts the tungsten powder, and the tungsten powder is slowly compacted. The sealing member 12 on the side fits against the side wall of the punch 21 to form a preliminary sealing barrier, preventing a small amount of tungsten powder from entering the gap during the downward movement of the punch 21. When the punch 21 just contacts the tungsten powder, the tungsten powder is not easily ejected. At this time, the pressure of the punch 21 on the tungsten powder has not yet formed an obvious extrusion effect. The external force received by the tungsten powder is mainly the gravity of the punch 21 and the initial slight contact pressure, and a large pressure difference and flow trend sufficient to extrude the tungsten powder from the die gap have not been formed. Moreover, at this time, the tungsten powder is relatively loosely distributed in the female die 1, and the friction and cohesion between the particles can still maintain the overall stability of the powder to a certain extent and prevent it from being ejected from the gap.

[0021] However, in the prior art, as the punch 21 starts to slowly move downward and enters the early stage of pressing, the pressure received by the tungsten powder gradually increases, the air between the powder is gradually discharged, and the tungsten powder begins to be compressed. At this stage, when the pressure reaches a certain level, the tungsten powder may start to be ejected from the die gap. Because as the pressure increases, the friction and cohesion between the tungsten powder particles gradually become difficult to resist the external force, and relative sliding and flow start to occur, making it easier for the tungsten powder to be ejected in the early stage of pressing. In the later stage of pressing, the tungsten powder has been compressed to a relatively high density, and the gaps between the particles become very small. Theoretically, the possibility of the tungsten powder being ejected will decrease. At this time, it is more important to perform all-round pressing on the tungsten powder. Therefore, in order to reduce the spattering of the tungsten powder during the pressing process, the present invention adopts the sealing structure 23 design to seal the gap between the female die 1 and the punch 21.

[0022] Before pressing, the punch 21 is in the upper initial position, and the eccentric wheel 237 is in the initial state. At this time, the bottom end and the side area of the punch 21 are relatively small, which is convenient for it to smoothly enter the female die 1 without generating intense friction with the tungsten powder. The sealing structure 23 on the side fits against the side wall of the punch 21 to form a preliminary sealing barrier, preventing a small amount of tungsten powder from entering the gap during the downward movement of the punch 21. When the punch 21 descends close to the tungsten powder, the contact between the rubber strip 22 and the sealing member 12 occurs. The sensing member in the sealing member 12 drives the pressing frame 31 to move downward, the pressing frame 31 drives the pressing plate 32 to move downward, and the pressing plate 32 exerts a force on the inclined wedge plate 238, and the inclined wedge plate 238 is forced to push the eccentric wheel 237 to start rotating.

[0023] Different from the structure with overall rigid connection, the linkage between the above structures can reduce the direct force during the pressing process and avoid damage. In addition to the fixing frame 234, there is also an eccentric wheel 237. When the bottom end of the arc-shaped plate 232 is parallel to the bottom surface of the punch 21 for compaction operation, the eccentric wheel 237 can also apply a force to the arc-shaped plate 232 to prevent the arc-shaped plate 232 from moving upward due to force.

[0024] The rotation of the eccentric wheel 237 causes the arc-shaped plate 232 to gradually move from the state of being completely embedded in the movable groove 231 to the outside of the movable groove 231. The arc-shaped plate 232 fills the gap between the punch 21 and the die 1, further reducing the gap. Specifically, the protruding part of the eccentric wheel 237 gradually expands outward to fill the gap between the punch 21 and the die 1, enhancing the sealing effect. At the same time, while the eccentric wheel 237 rotates to expand the sealing area, its contour dynamically scratches the sealing strip 121 on the inner wall of the die 1. Using the relative displacement generated by the eccentricity, the tungsten powder particles attached to the surface of the sealing strip 121 are continuously removed. This cleaning process is synchronized with the pressing action. Through the periodic movement of the eccentric wheel 237, the real-time self-cleaning of the sealing structure 23 is realized, avoiding the problems of sealing failure and die adhesion caused by powder accumulation, effectively prolonging the service life of the die, reducing the frequency of manual cleaning, and improving production efficiency.

[0025] After the eccentric wheel 237 rotates to the in-place position, its bottom surface and the seal 12 on the side of the die 1 jointly form a gradient sealing interface. This structure can effectively eliminate the powder leakage problem caused by the die gap in traditional static sealing. Through the precise angle control of the eccentric wheel 237, the quantitative adjustment of the sealing area is realized. Under the high-pressure pressing working condition, the micro-gap sealing accuracy can still be maintained, ensuring that there is no lateral overflow of tungsten powder during the compression process, significantly improving the density uniformity and dimensional consistency of the blank forming. As the punch 21 continues to press down, the increased area of the punch 21 makes the tungsten powder receive uniform and stable pressure, reducing the problem of powder extrusion caused by uneven pressure. The sealing structure 23 and the eccentric wheel 237 cooperate effectively to prevent tungsten powder from spraying out from the gap.

[0026] The punch 21 adopts a trapezoidal design with a narrower upper part and a wider lower part. The narrow end of the trapezoidal punch 21 contacts the tungsten powder first, which can play a good guiding and positioning role, making the punch 21 more accurately aligned with the tungsten powder in the die 1 and reducing the problems of uneven distribution of tungsten powder or die damage caused by alignment deviation. And because the narrow end contacts first, compared with the flat punch 21, under the same pressure, the contact area between the narrow end of the trapezoidal punch 21 and the tungsten powder is small, and the pressure per unit area is large, which can make the tungsten powder receive a large local pressure in the initial stage, helping to initially compact the tungsten powder, making it easier to be evenly distributed in the subsequent pressing process, and at the same time reducing the possibility of tungsten powder splashing everywhere during the initial pressing.

[0027] As the punch 21 is pressed down, the side of the trapezoid gradually contacts the tungsten powder, the contact area gradually increases, and the pressure on the tungsten powder is gradually and evenly transmitted to more areas, thereby achieving gradual compaction of the tungsten powder. This progressive compaction method can avoid excessive stress concentration inside the tungsten powder due to a sudden increase in pressure, which is beneficial to improving the density uniformity and structural stability of the tungsten powder blank after compaction.

[0028] When the side of the trapezoidal punch 21 contacts the tungsten powder, a certain lateral force will be generated on the tungsten powder, prompting the tungsten powder to produce a certain degree of lateral flow in the die 1, which helps to fill every corner of the die 1, especially for some complex-shaped dies 1, which can better ensure the uniform filling of tungsten powder in the mold and reduce the formation of pores and defects.

[0029] After the pressing is completed, the eccentric wheel 237 rotates synchronously in the opposite direction when the punch 21 rises, driving the sealing structure 23 to quickly retract to the initial state, so that the lower part of the punch 21 returns to the narrow end shape. This modular shrinkage design significantly reduces the demolding resistance, and the demolding force is reduced compared to the traditional rectangular punch 21. The narrow end shape is combined with the trapezoidal taper to form a natural demolding guide, avoiding friction damage between the blank and the side wall of the mold, and ensuring the surface finish and dimensional accuracy of the formed blank. The structure can flexibly adjust the sealing area and contact pressure of the punch 21 through the rotation angle control of the eccentric wheel 237, and is compatible with tungsten powder raw materials with different particle size distributions and fluidity as well as diversified blank forming requirements.

[0030] During the demoulding process, the shape of the trapezoidal punch 21 can also play a certain self-centering role, so that the blank can maintain a relatively stable position during demoulding and is not prone to deviation or shaking, which helps to realize automated demoulding operations and improve production efficiency and product consistency.

[0031] The movement of the eccentric wheel 237 on the side of the punch 21 is utilized. In the early stage of the pressing process, when the punch 21 moves downward to its upper part and contacts the sealing strip 121, the movement is captured by the sensor and fed back to the intelligent controller. The controller then issues a command to drive a specific control structure to apply a force to the eccentric wheel 237, causing the eccentric wheel 237 to start rotating. During the rotation of the eccentric wheel 237, the gap between the punch 21 and the die 1 is dynamically filled, ensuring a good sealing environment during the pressing process and effectively preventing the leakage of tungsten powder.

[0032] When the arc-shaped plate 232 moves to the edge of the groove 25 of the punch 21, it moves downward by a certain distance. At this time, the bottom end of the arc-shaped plate 232 is flush with the bottom end of the punch 21. The arc-shaped plate 232 drives the side plate 233 to move. The side of the side plate 233 is designed with an inclined edge, and a flexible layer is arranged on the inclined surface. While the arc-shaped plate 232 moves downward, it drives the side plate 233 to move downward. The heights of adjacent side plates 233 are different, the heights of symmetric sides are the same, and at the same time, the height of the corresponding edge position of the groove 25 also matches it. For the side plate 233 with a higher position, the depth dimension of the groove 25 is larger and the slope is smaller. For the side plate 233 with a lower position, the depth dimension of the groove 25 is smaller and the slope is larger. During the downward movement, due to the smaller depth dimension and larger slope, the side plate 233 with a lower position can quickly move to a position flush with the bottom surface of the punch 21. After the side plate 233 with a lower position moves to the corresponding position, due to the larger depth dimension of the side plate 233 with a higher position, the side plate 233 with a higher position will move to the corresponding position. Instead, during the upward movement of the side plate 233 with a lower position, because of the larger slope, the time to move back to the initial position is long; at this time, the side plate 233 with a higher position has a smaller slope, so it quickly moves back to the initial position. Under the action of the same driving force, the recovery of the side plates 233 with different heights is realized, and due to the different recovery speeds, there will be no movement interference between them.

[0033] The eccentric wheel 237 rotates inside the punch 21, and its eccentric part gradually presses the upper arc-shaped plate 232. The arc-shaped plate 232 overcomes the friction force and moves towards the side of the die 1. The arc-shaped plate 232 drives the movable shaft 236 to slide along the groove 25. The arc-shaped plate 232 moves downward under the restriction of the fixed frame 234 until it reaches a suitable position. The bottom end of the fixed frame 234 is flush with the bottom surface of the punch 21, realizing an increase in the bottom area of the punch 21. After the pressing is completed, the eccentric wheel 237 is unrestricted and returns to its original position under the action of gravity and the push of the arc-shaped plate 232. At the same time, the arc-shaped plate 232 returns to the initial position under the action of the telescopic spring 235.

[0034] Through precise gap filling and good sealing performance, problems such as tungsten powder leakage, pores, and defects inside the billet are reduced, the density uniformity and dimensional accuracy of the product are improved, and thus the overall quality of the product is enhanced.

[0035] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 ,A positioning groove 11 is opened at the upper end inside the die 1. A sealing member 12 is arranged on the inner wall of the positioning groove 11. The sealing member 12 includes a fixed shaft 123 hinged to the side of the inner wall of the positioning groove 11. A fixing plate 122 is fixedly connected to the outer wall of the fixed shaft 123. A sealing strip 121 is arranged on the side of the fixing plate 122.

[0036] After the pressing process is completed, the punch 21 moves upward. When it contacts the sealing strip 121 again, the sensor senses this action again and conveys it to the intelligent controller. The controller quickly reacts, and then the eccentric wheel 237 rotates in the reverse direction. When the eccentric wheel 237 moves in the reverse direction, its contour interacts with the lower end of the sealing strip 121, generating an upward thrust, which causes the sealing strip 121 and the fixing plate 122 fixedly connected thereto to rotate upward synchronously. This action not only significantly increases the space above the upper part of the female die 1, provides sufficient space for the demoulding operation, reduces the demoulding difficulty, but also moves the sealing strip 121 out of the interior of the female die 1 to an area convenient for cleaning, facilitating the timely cleaning and maintenance of the sealing strip 121, and ensuring the long-term stability of the sealing performance.

[0037] The convenient demoulding design and the characteristics of being easy to clean and maintain reduce the demoulding time and the die maintenance time, reduce the equipment downtime, improve the production efficiency, and reduce the production cost. It reduces the pollution of tungsten powder to the die and equipment, reduces the wear and corrosion degree of the die, extends the service life of the die and equipment, and reduces the repair and replacement cost of the equipment.

[0038] The operator can conveniently clean and inspect the sealing strip 121 removed from the female die 1, remove the attached tungsten powder particles, and ensure good sealing performance. After the cleaning is completed, wait for the next pressing cycle.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A tungsten powder pressing and forming system for processing tungsten-based precision cutting tool blanks, characterized in that, Comprising: A female die (1); A stamping part (2), the stamping part (2) is snap - connected with the female die (1), the stamping part (2) includes a male die (21) designed in a trapezoidal shape, a rubber strip (22) in contact with the inner wall of the female die (1) is arranged at the upper end position of the side of the male die (21), and a sealing structure (23) is arranged on the side of the male die (21); A downward pressing mechanism (3), the downward pressing mechanism (3) is located at the top of the stamping part (2); The sealing structure (23) includes a movable groove (231). In the initial state, an arc - shaped plate (232) is embedded in the movable groove (231). The inner wall of the arc - shaped plate (232) fits with the outer surface of the circular shaft of an eccentric wheel (237). A wedge plate (238) is arranged at the bottom end of the eccentric wheel (237). The movement of the wedge plate (238) drives the eccentric wheel (237) to rotate. The eccentric wheel (237) exerts an effect on the arc - shaped plate (232) to move it out of the inner wall of the male die (21) and close to the inner wall of the female die (1); Wherein, the sealing structure (23) further includes a side plate (233) fixed to the bottom end of the outer wall of the arc - shaped plate (232). The side plates (233) move to fit with each other as the arc - shaped plate (232) moves.

2. The tungsten powder compacting and forming system for processing tungsten-made precision tool blanks according to claim 1, wherein: A positioning groove (11) is opened at the upper end inside the female die (1). A sealing member (12) is arranged on the inner wall of the positioning groove (11). The sealing member (12) includes a fixed shaft (123) hinged to the side of the inner wall of the positioning groove (11). A fixing plate (122) is fixedly connected to the outer wall of the fixed shaft (123). A sealing strip (121) is arranged on the side of the fixing plate (122).

3. A tungsten powder compacting and forming system for processing tungsten-made precision tool blanks according to claim 1, characterized in that: The downward pressing mechanism (3) includes a pressing frame (31) electrically connected to the rubber strip (22). A pressing plate (32) in contact with the side of the wedge plate (238) is fixedly connected to the bottom end of the pressing frame (31).

4. A tungsten powder compaction and forming system for processing tungsten-based precision tool blanks according to claim 3, characterized in that: Sliding grooves (24) slidably connected with the pressing plate (32) are symmetrically opened at the top end of the male die (21). A channel for the movement of the wedge plate (238) is opened at the lower part of the sliding groove (24). The wedge plate (238) is designed with symmetrically inclined tops.

5. A tungsten powder pressing and forming system for processing tungsten-made precision tool blanks according to claim 1, characterized in that: Both ends of the arc - shaped plate (232) are fixedly connected with movable shafts (236). The movable shafts (236) are slidably connected with grooves (25) opened on the inner wall of the male die (21). The grooves (25) are composed of a horizontal groove and an inclined groove.

6. The tungsten powder compacting and forming system for processing tungsten-based precision tool blanks according to claim 5, characterized in that: A fixing frame (234) is arranged on the outer wall of the movable shaft (236). A telescopic spring (235) is arranged on the side of the fixing frame (234) close to the sliding groove (24).

7. A tungsten powder compacting and forming system for processing tungsten-based precision tool blanks according to claim 1, characterized in that: The side of the side plate (233) is designed with an inclined edge, and a flexible layer is arranged on the inclined surface. The heights of adjacent side plates (233) are different, and the heights of symmetric side plates (233) are the same.

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