A cold pressing mold for cutting blades

Abstract

This invention provides a cold pressing mold for a cutting head, comprising: a lower punch, a female mold, and an upper die; the female mold has a cavity with the same shape as the cutting head, the end contour of the lower punch is clearance-fitted with the inner contour of the female mold cavity, and the upper die and the lower punch are respectively disposed on the upper and lower sides of the female mold; a plurality of powder guiding grooves are spaced apart on the side wall of the lower punch, the powder guiding grooves are disposed on the side wall of the lower punch and are not connected to the pressure end face of the lower punch, and can guide the powder in the gap between the lower punch and the female mold. This invention, by providing powder guiding grooves (annular, spiral, or strip-shaped) on the side wall of the lower punch, actively captures and guides the powder that seeps into the gap between the lower punch and the female mold, avoiding the formation of a powder accumulation layer on the inner wall of the female mold, significantly reducing the risk of mold jamming, and reducing the frequency of downtime maintenance due to blockage.

Description

Technical Field

[0001] This utility model relates to the field of cold press machines, and in particular to a cold press mold with a cutting head. Background Technology

[0002] Stamping dies are special process equipment used in cold stamping to process materials into parts. Rectangular dies are widely used in the cold pressing production of cutting tools. However, existing rectangular dies for cold pressing cutting tools have many problems that urgently need to be solved. Besides the uneven surface of the die causing powder to easily enter the gap between the lower punch and the die and cause blockage, the die and lower punch suffer severe wear due to long-term high pressure. Frequent die replacements not only increase production costs but also significantly affect production efficiency. Furthermore, the design of traditional dies is insufficient in terms of powder distribution uniformity, resulting in inconsistent quality of the pressed cutting tools and a high scrap rate. Additionally, during the demolding process, cutting tools often stick to the die, further reducing production efficiency and potentially damaging the cutting tools.

[0003] Existing technology CN201220386034.5 discloses a stamping die, including an upper die assembly and an upper pressing die assembly corresponding to and cooperating with the upper die assembly. A lower punch is mounted on the upper die assembly. A concave die is mounted on the upper pressing die assembly, and a through hole is formed on the concave die assembly corresponding to the lower punch. The upper half of the through hole is a cutting edge, and the lower half is a blanking portion that expands radially outward. The upper part of the cutting edge is the same size as the lower punch, and the lower part of the cutting edge is a straight hole with a diameter larger than that of the lower punch. Although this solution maintains a clearance fit with the lower punch through the lower part of the cutting edge, avoiding wear of the cutting edge, the following problems still exist:

[0004] 1. Although a gap is reserved between the straight hole at the bottom of the cutting edge and the lower punch, during high-pressure pressing, especially when processing ultrafine powders (such as cemented carbide powder with a particle size <50μm), the powder will still penetrate into the gap due to lateral extrusion force. As the lower punch reciprocates, the infiltrated powder is repeatedly crushed to form hard particles, which accelerates the wear of the cutting edge and the lower punch, and may even cause the mold to jam.

[0005] 2. During the cold pressing process, powder is present in the gap between the straight hole and the lower punch. The friction between the lower punch and the powder, as well as the heat generated by the high pressure, will cause the temperature of the lower punch to rise. Excessive temperature will not only reduce the hardness of the lower punch material and decrease its wear resistance, but the temperature change will also cause thermal expansion and contraction of the lower punch, generating thermal stress inside the lower punch, which will further accelerate the wear and damage of the lower punch. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a cold pressing die with a cutting head, which actively captures and guides the powder material that seeps into the gap between the lower punch and the female die by setting a powder guiding groove (ring, spiral or strip) on the side wall of the lower punch, thereby avoiding the formation of an accumulation layer of powder material on the inner wall of the female die, significantly reducing the risk of die jamming, and reducing the frequency of downtime maintenance caused by blockage.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A cold pressing die for a cutting head is provided, comprising: a lower punch, a female die, and an upper die; the female die has a cavity with the same shape as the cutting head, the end contour of the lower punch is clearance-fitted with the inner contour of the female die cavity, and the upper die and the lower punch are respectively disposed on the upper and lower sides of the female die in an upper and lower fit.

[0009] The lower punch has several powder guiding grooves spaced apart on its side wall. These grooves are located on the side wall of the lower punch and are not connected to the pressure end face of the lower punch. They are used to guide the powder in the gap between the lower punch and the die.

[0010] It should be noted that the lower punch, female die, and upper die constitute the core components of a cold-pressing die. The pressure-applying end face refers to the end face of the lower punch opposite to the upper die. The upper die is responsible for applying pressure to the female die and sealing the powder inside the female die cavity. The lower punch supports the powder and presses the loose powder inside the female die cavity into shape, while also being responsible for demolding the formed cutting head. The contour of the female die cavity precisely replicates the geometry of the cutting head, constraining the flow of powder through the die cavity to ensure uniform distribution of powder pressure during the forming process. The gap between the lower punch and the inner wall of the female die cavity is controlled at 0.02-0.05mm (typical value), ensuring the free movement of the lower punch. This design also prevents large-scale powder leakage. The lower punch acts as a rigid support platform, and the reaction force applied to the upper die forms a closed force system, achieving bidirectional compression of the powder to form the cutting head. This design incorporates a powder guide groove on the lower punch. Through chip containment and flow guidance, the powder that seeps into the gap is directed to the non-friction area, preventing the formation of an accumulation layer on the inner wall of the die. When the lower punch reciprocates, the powder guide groove forms a microchannel on the side wall. Utilizing the vibration of the stamping action and the fluidity of the powder itself, the powder in the gap is dynamically discharged, preventing the powder from being repeatedly crushed under high pressure to form hard particles and avoiding jamming of the die and lower punch due to powder accumulation.

[0011] Preferably, the lower punch includes an integrally formed pressure head and a connecting rod. The shape of the pressure head is adapted to the mold cavity of the female mold. The connecting rod is fixed on the punch fixing seat on the cold press. The powder guiding groove is provided on the side wall of the pressure head.

[0012] It should be noted that the shape of the pressure head is adapted to the cavity of the die to ensure support and forming effect for the powder. The powder guiding groove is only set on the side wall of the pressure head, while the connecting rod has no powder guiding groove, avoiding the impact of slotting on structural stability. At the same time, it accurately guides the powder in the gap between the pressure head and the die. The shape of the pressure head is adapted to the cavity of the die. When the cold press drives the upper die to move downward, the die moves downward under pressure, allowing the pressure head to enter the cavity of the die and apply pressure to the powder in the cavity, gradually forming it into a cutting head. The one-piece molded pressure head and connecting rod structure avoids weak points in the connection caused by using multiple parts, improving the overall structural strength and stability of the lower punch. The connecting rod is fixed on the punch fixing seat of the cold press. This structural design makes the installation and disassembly of the lower punch relatively convenient. When it is necessary to maintain the mold, replace the lower punch, or adjust the mold parameters, the operation can be carried out quickly, reducing downtime and improving production efficiency.

[0013] Preferably, the punch holder has a positioning groove corresponding to the cavity of the female mold, and the lower end of the connecting rod is detachably fixed in the positioning groove.

[0014] It should be noted that during the cold pressing process, the punch holder, as a key component connecting the cold press and the lower punch, plays a crucial role in transmitting power and positioning. The positioning groove is designed to correspond to the cavity of the female mold. When the lower end of the connecting rod is placed in the positioning groove, it ensures precise alignment between the lower punch's pressure head and the female mold cavity, guaranteeing their coaxiality. This allows the pressure head to apply pressure evenly to the powder during pressing, avoiding problems such as inconsistent punch size and uneven density caused by positional deviations, thus significantly improving the forming accuracy and quality of the punch. The detachable connection method makes replacing the lower punch simple and quick. When the mold wears or needs adjustment, the operator can easily remove the connecting rod from the positioning groove and replace the lower punch, greatly reducing downtime for maintenance and improving production efficiency.

[0015] Preferably, the powder guiding groove is an annular groove surrounding the outer circumferential surface of the pressure head, and the annular groove is arranged sequentially at intervals along the axial direction of the pressure head on the outer circumferential surface of the pressure head.

[0016] It should be noted that the annular groove's surrounding structure can collect powder that may enter the gap between the pressure head and the die without any blind spots. During the cold pressing process, the annular grooves can effectively capture the powder from any direction it enters the gap, avoiding the situation where some powder cannot be guided due to the uncertain position of the powder entering the gap. The way the grooves are arranged sequentially and at intervals along the axial direction of the press head allows the powder guiding grooves to play a role at different heights. As the lower punch moves up and down in the mold cavity, the annular grooves at different positions can guide the powder in stages and multiple layers. When the upper die presses down to contact the female die, the female die will move down with the upper die. The loose powder in the mold cavity will become denser due to the pressure of the upper die. Some powder with smaller particle size will enter the gap between the lower punch and the mold cavity. At this time, the upper annular groove of the lower punch will first contact and capture the infiltrated powder. When the pressing is completed, the lower punch will push the blank out of the mold cavity for demolding. At this time, the lower annular grooves can also participate in the powder guiding process in turn. Afterwards, the lower punch returns to the powder loading height. In this reciprocating motion of the lower punch, the powder in the gap will be gradually discharged and will not stick to the inner wall of the mold cavity to cause the mold to jam.

[0017] Preferably, the depth of the annular groove is 0.1-0.3 mm, the width is 0.5-1 mm, and the spacing between adjacent grooves is 2-5 mm.

[0018] It should be noted that a depth between 0.1-0.3mm ensures sufficient space in the annular groove to accommodate the infiltrated powder, preventing it from overflowing and re-entering the gap between the punch and die, causing blockage and wear. Furthermore, this depth does not significantly impact the structural strength of the pressure head. If the groove is too deep, it weakens the overall strength of the pressure head, increasing the risk of deformation or even breakage under high pressure during cold pressing. Conversely, if the groove is too shallow, its powder-accommodating capacity is limited, hindering effective powder flow. A width of 0.5-1mm takes into account both powder flowability and the difficulty of groove processing. This width range ensures sufficient flow space for the powder within the groove, facilitating smooth movement and discharge during punch movement, while avoiding excessive width that could compromise the fit and stability between the pressure head and die. Additionally, this width is relatively easy to achieve in processing, ensuring accuracy and reducing manufacturing costs.

[0019] Preferably, the powder guiding groove is a spiral groove arranged around the outer circumference of the pressure head, the pitch of the spiral groove is 3-8mm and the depth is 0.1-0.4mm; and the projection distance between the starting end and the ending end of the spiral groove in the axial direction of the pressure head is not less than one-third of the length of the pressure head.

[0020] It should be noted that the spiral groove design fully utilizes the reciprocating motion characteristics of the lower punch during the cold pressing process. When the lower punch enters the mold cavity, the spiral groove structure ensures that the powder that seeps into the gap between the lower punch and the die not only falls due to gravity but also moves in an orderly manner along the spiral direction under the guidance of the spiral groove. Compared with the annular groove, this guiding method can more effectively expel the powder from the gap, greatly improving the powder expulsion efficiency. Because the powder has a longer movement path in the spiral groove, it can obtain more power and time to transfer during the punch movement, thereby reducing the residue of powder in the gap and reducing the risk of mold wear and jamming caused by powder accumulation. The projection distance between the starting and ending ends of the spiral groove on the axial direction of the pressure head is not less than one-third of the pressure head length to ensure that the spiral groove has sufficient length to complete the powder expulsion work.

[0021] Preferably, the powder guiding groove is a strip-shaped groove arranged along the axial direction of the lower punch on the side wall of the lower punch. The strip-shaped groove is evenly distributed and spaced around the pressure end face of the lower punch on the side wall of the press head, and the interval between the strip-shaped groove and the pressure end face of the lower punch is 3-8mm.

[0022] It should be noted that the strip groove is arranged along the axial direction of the punch, giving it a clear directionality when capturing powder. As the punch enters the die, the powder that seeps into the gap between the punch and the die will directly enter the strip groove along the axial direction. This direct capture method is simple and efficient. Compared to annular grooves, strip grooves are more effective at concentrating and guiding powder in a specific direction, facilitating subsequent processing. Compared to spiral grooves, its structure is simpler, its manufacturing difficulty is lower, and it can effectively reduce the manufacturing cost of the mold.

[0023] Preferably, the cross-section of the strip groove is trapezoidal, the groove opening width is 0.8-1.2mm, the groove bottom width is 0.5-0.8mm, and the depth is 0.2-0.4mm.

[0024] It should be noted that the trapezoidal cross-section design optimizes the flow characteristics of powder within the groove. The shape, wider at the top and narrower at the bottom, makes it easier for the groove opening to receive powder seeping in from the gap between the punch and the die. The wide groove opening can quickly capture the powder and prevent it from accumulating in the gap, while the gradually narrowing bottom guides the powder to concentrate. Utilizing gravity and the force generated by the movement of the lower punch, the powder moves more smoothly within the groove. Compared to a rectangular cross-section, the trapezoidal design can avoid bridging of powder within the groove, ensuring that the powder can continuously flow in a specific direction, thus improving the stability and reliability of powder guiding.

[0025] The beneficial effects of this utility model are:

[0026] This utility model provides a cold pressing die for a cutting head. By setting powder guiding grooves (annular, spiral, or strip-shaped) on the side wall of the lower punch, it actively captures and guides the powder that seeps into the gap between the lower punch and the die, preventing the powder from forming an accumulation layer on the inner wall of the die. This significantly reduces the risk of die jamming, reduces the frequency of downtime maintenance due to blockage, greatly improves the continuity and stability of production, and reduces production interruption losses caused by die failure. Furthermore, the three powder guiding groove designs—annular, spiral, and strip-shaped—allow the selection of the optimal solution based on the powder characteristics (such as particle size and flowability) and the cutting head specifications. At the same time, the dimensions of the powder guiding grooves (such as depth, width, and spacing) are optimized to ensure the guiding effect while taking into account the structural strength and processing feasibility of the pressing head, facilitating standardized production and die maintenance. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a blade cold pressing mold according to Embodiment 1 of this utility model.

[0028] Figure 2 This is a schematic diagram of the punch fixing seat in Embodiment 1 of this utility model.

[0029] Figure 3 This is a schematic diagram of the structure of the female mold in Embodiment 1 of this utility model.

[0030] Figure 4 This is a three-dimensional structural diagram of the lower punch in Embodiment 1 of this utility model.

[0031] Figure 5 This is a three-dimensional structural diagram of a blade cold pressing mold according to Embodiment 2 of this utility model.

[0032] Figure 6 This is a three-dimensional structural diagram of the lower punch in Embodiment 2 of this utility model.

[0033] Figure 7 This is a three-dimensional structural diagram of a blade cold pressing mold according to Embodiment 3 of this utility model.

[0034] Figure 8 This is a three-dimensional structural diagram of the lower punch in Embodiment 3 of this utility model.

[0035] In the diagram: 1. Lower punch; 11. Press head; 12. Connecting rod; 2. Female mold; 21. Mold cavity; 3. Upper die; 4. Powder guide groove; 41. Annular groove; 42. Spiral groove; 43. Strip groove; 5. Punch fixing seat; 51. Positioning groove.

[0036] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Example 1

[0039] like Figures 1-4 As shown, a cold pressing die for a cutting head includes: a lower punch 1, a female die 2, and an upper die 3; the female die 2 has a cavity 21 with the same shape as the cutting head, the end contour of the lower punch 1 is clearance-fitted with the inner contour of the cavity 21 of the female die 2, and the upper die 3 and the lower punch 1 are respectively disposed on the upper and lower sides of the female die 2.

[0040] The lower punch 1 has several powder guiding grooves 4 spaced apart on its side wall. The powder guiding grooves 4 are located on the side wall of the lower punch 1 and are not connected to the pressure end face of the lower punch 1. They can guide the powder in the gap between the lower punch 1 and the female mold 2.

[0041] The lower punch 1 includes an integrally formed pressure head 11 and a connecting rod 12. The shape of the pressure head 11 is adapted to the mold cavity 21 of the female mold 2. The connecting rod 12 is fixed on the punch fixing seat 5 on the cold press. The powder guiding groove 4 is provided on the side wall of the pressure head 11.

[0042] The punch fixing seat 5 is provided with a positioning groove 51 corresponding to the cavity 21 of the female mold 2, and the lower end of the connecting rod 12 is detachably fixed in the positioning groove 51.

[0043] The powder guiding groove 4 is an annular groove 41 arranged around the outer peripheral surface of the pressure head 11. The annular groove 41 is arranged sequentially at intervals along the axial direction of the pressure head 11 on the outer peripheral surface of the pressure head 11.

[0044] The annular groove 41 has a depth of 0.2 mm, a width of 0.6 mm, and a spacing of 3 mm between adjacent grooves.

[0045] The working principle and usage method of a cold pressing die for cutting heads in this embodiment are as follows:

[0046] This embodiment provides a cold pressing mold for a cutting head. A cavity 21 with the same shape as the cutting head is opened on the female mold 2. The end contour of the lower punch 1 is clearance-fitted with the inner contour of the cavity 21 of the female mold 2. The upper pressure mold 3 and the lower punch 1 are respectively arranged on the upper and lower sides of the female mold 2. When the upper pressure mold 3 moves downward, it applies pressure to the female mold 2 and seals the powder in the cavity 21 of the female mold 2. The pressing head 11 of the lower punch 1 enters the cavity 21 of the female mold 2 and, together with the upper pressure mold 3, performs bidirectional compression on the loose powder in the cavity 21 of the female mold 2, so that the powder gradually forms a cutting head. After pressing, the upper push of the lower punch 1 is responsible for ejecting the formed cutting head from the female mold 2 for demolding. The powder guiding groove 4 is arranged on the side wall of the lower punch 1 and is not connected to the pressing end face of the lower punch 1. The annular grooves 41 are arranged sequentially and at intervals along the axial direction of the pressure head 11 on the circumferential surface of the pressure head 11. During the cold pressing process, the powder will seep into the gap between the lower punch 1 and the female die 2 due to the lateral extrusion force. No matter which direction the powder seeps into the gap between the lower punch 1 and the female die 2, the surrounding structure of the annular grooves 41 can capture the powder 360° without dead angles. As the lower punch 1 enters the female die 2, the annular grooves 41 at different height positions play a role in stages and in multiple layers. When the lower punch 1 enters the female die 2, the upper annular grooves 41 first contact and capture the powder that has seeped in. As the lower punch 1 continues to enter the female die 2, the lower annular grooves 41 participate in the capture and guidance of the powder in turn, making full use of the movement stroke of the lower punch 1, improving the efficiency and effect of powder guidance, and effectively avoiding the accumulation of powder in the gap.

[0047] Before use, carefully inspect the surfaces of the lower punch 1, female die 2, and upper die 3 for damage, cracks, wear, or other defects to ensure the precision and integrity of the mold. Pay particular attention to checking for any residual powder in the annular groove 41 on the side wall of the lower punch 1 to ensure it can properly guide the powder. Next, install the female die 2 and the punch holder 5 in their designated positions on the cold press, ensuring they are securely installed and level. Align the lower end of the connecting rod 12 of the lower punch 1 with the positioning groove 51 of the punch holder 5 and gently push it until fully embedded (secure the connecting rod 12 with bolts or a quick-release mechanism to ensure the lower punch 1 does not loosen during pressing). Simultaneously, ensure the pressure head 11 is aligned with the mold cavity 21 of the female die 2. Precisely align the upper die 3 and fix it onto the movable slider of the cold press, ensuring that it is parallel and in contact with the upper surface of the female die 2 when pressing down, and can seal the mold cavity 21 to avoid uneven loading. Then, turn on the power to the cold press and start it according to the operating procedures to preheat and debug the equipment, ensuring that all parameters of the cold press are normal, such as pressure, stroke, and speed. Start the drive mechanism of the cold press, which drives the upper die 3 to press down. After contacting the upper surface of the female die 2, it continues to apply pressure, pushing the female die 2 downward as a whole, so that the pressure head 11 of the lower punch 1 gradually enters the mold cavity 21, forming bidirectional compression with the upper die 3. During this process, if powder seeps into the gap, it will surround the pressure head 1. 1. The annular groove 41 on the outer periphery begins to function. The upper annular groove 41 first contacts and captures the infiltrated powder. As the pressure head 11 continues to enter the female mold 2, the lower annular groove 41 sequentially participates in the capture and guidance of the powder. The pressure head 11 continues to enter the female mold 2, contacts the powder inside the female mold 2, and gradually applies pressure. The contour of the mold cavity 21 of the female mold 2 accurately replicates the geometry of the cutting head. Under the pressure of the pressure head 11, the powder is compressed and shaped within the mold cavity 21 of the female mold 2. At the same time, the female mold 2 constrains the flow of the powder through the mold cavity 21, ensuring that the powder is evenly distributed under pressure, thereby ensuring the forming accuracy of the cutting head. When the pressure head 11 enters the female mold 2 to the set position, the cooling... The press maintains a certain pressure, allowing the powder to be continuously pressed for a period of time to ensure the forming quality of the cutter head. After the pressure holding time ends, the drive mechanism of the cold press drives the upper mold 3 to move upward and return. The female mold 2 returns to its initial position under the action of the reset mechanism. At the same time, the lower punch 1 pushes upward, smoothly ejecting the formed cutter head blank from the mold cavity 21. The powder guide groove 4 further discharges residual powder at this stage, reducing demolding resistance. The ejected cutter head is taken away by a robot or manually and enters the subsequent sintering process. After completing one cold pressing production of the cutter head, the next production is carried out according to the above steps. The processes of pre-production preparation, cold pressing operation, demolding and cleaning are repeated continuously to achieve continuous production of the cutter head.

[0048] Example 2

[0049] like Figure 5 and Figure 6As shown, a cold pressing die for a cutting head according to this embodiment includes: a lower punch 1, a female die 2, and an upper die 3; the female die 2 has a cavity 21 with the same shape as the cutting head, the end contour of the lower punch 1 is clearance-fitted with the inner contour of the cavity 21 of the female die 2, and the upper die 3 and the lower punch 1 are respectively disposed on the upper and lower sides of the female die 2 in a vertically fitted manner.

[0050] The lower punch 1 has several powder guiding grooves 4 spaced apart on its side wall. The powder guiding grooves 4 are located on the side wall of the lower punch 1 and are not connected to the pressure end face of the lower punch 1. They can guide the powder in the gap between the lower punch 1 and the female mold 2.

[0051] The lower punch 1 includes an integrally formed pressure head 11 and a connecting rod 12. The shape of the pressure head 11 is adapted to the mold cavity 21 of the female mold 2. The connecting rod 12 is fixed on the punch fixing seat 5 on the cold press. The powder guiding groove 4 is provided on the side wall of the pressure head 11.

[0052] The punch fixing seat 5 is provided with a positioning groove 51 corresponding to the cavity 21 of the female mold 2, and the lower end of the connecting rod 12 is detachably fixed in the positioning groove 51.

[0053] The powder guiding groove 4 is a spiral groove 42 arranged around the outer peripheral surface of the pressure head 11. The spiral groove 42 has a pitch of 5 mm and a depth of 0.4 mm. The projection distance between the starting end and the ending end of the spiral groove 42 in the axial direction of the pressure head 11 is not less than one-third of the length of the pressure head 11.

[0054] Compared with Example 1:

[0055] This embodiment provides a cold pressing die for a cutting head. The unique structure of the spiral groove 42 provides a clear flow direction for the powder. When the lower punch 1 enters the female die 2, the powder will be displaced in a spiral direction under the influence of the generated air pressure and guided by the spiral groove 42. This guiding method is more efficient than the layered guidance of the annular groove 41, which greatly increases the movement distance and time of the powder in the gap. Since the spiral groove 42 can discharge the powder more efficiently, it reduces the probability of the powder forming hard particles in the gap, thereby significantly reducing the wear between the female die 2 and the lower punch 1.

[0056] Example 3

[0057] like Figure 7 and Figure 8 As shown, a cold pressing die for a cutting head according to this embodiment includes: a lower punch 1, a female die 2, and an upper die 3; the female die 2 has a cavity 21 with the same shape as the cutting head, the end contour of the lower punch 1 is clearance-fitted with the inner contour of the cavity 21 of the female die 2, and the upper die 3 and the lower punch 1 are respectively disposed on the upper and lower sides of the female die 2 in a vertically fitted manner.

[0058] The lower punch 1 has several powder guiding grooves 4 spaced apart on its side wall. The powder guiding grooves 4 are located on the side wall of the lower punch 1 and are not connected to the pressure end face of the lower punch 1. They can guide the powder in the gap between the lower punch 1 and the female mold 2.

[0059] The lower punch 1 includes an integrally formed pressure head 11 and a connecting rod 12. The shape of the pressure head 11 is adapted to the mold cavity 21 of the female mold 2. The connecting rod 12 is fixed on the punch fixing seat 5 on the cold press. The powder guiding groove 4 is provided on the side wall of the pressure head 11.

[0060] The punch fixing seat 5 is provided with a positioning groove 51 corresponding to the cavity 21 of the female mold 2, and the lower end of the connecting rod 12 is detachably fixed in the positioning groove 51.

[0061] The powder guiding groove 4 is an annular groove 41 arranged around the outer peripheral surface of the pressure head 11. The annular groove 41 is arranged sequentially at intervals along the axial direction of the pressure head 11 on the outer peripheral surface of the pressure head 11.

[0062] The cross-section of the strip groove 43 is trapezoidal, with a groove opening width of 1mm, a groove bottom width of 0.6mm, and a depth of 0.3mm.

[0063] Compared with Example 1:

[0064] This embodiment provides a cold pressing die for a cutting head. The powder guiding groove 4 is a strip-shaped groove 43 arranged along the axial direction of the lower punch 1. When the lower punch 1 enters the female die 2, the powder material that seeps into the gap between the lower punch 1 and the female die 2 will directly enter the strip-shaped groove 43 along the axial direction. Compared with the annular groove 41 in Embodiment 1, its method of capturing powder is more direct and more directional, which can quickly and effectively collect the powder in the gap, avoid disorderly diffusion of powder in the gap, and reduce the possibility of powder accumulation. The strip-shaped groove 43 is evenly distributed and spaced around the lower end face of the lower punch 1, so that the powder in all directions can be evenly collected and guided. Moreover, the flow direction of the powder in the strip-shaped groove 43 is clear and unidirectional, all moving along the axial direction. This orderly flow method greatly improves the speed and efficiency of powder discharge from the gap. At the same time, the processing technology of the strip-shaped groove 43 is simpler. It needs to be processed along the axial direction of the lower punch 1. It can be accurately manufactured by conventional machining methods, such as milling, which reduces the processing difficulty and manufacturing cost of the die.

[0065] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is used only to illustrate the technical solution of this utility model, and is not intended to limit the protection scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the protection scope of this utility model.

[0066] In the description of this utility model, it should be understood that the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0067] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A cold press die for a knife head, comprising: The die comprises a lower punch (1), a female die (2), and an upper die (3); the female die (2) has a cavity (21) with the same shape as the cutting head, the end contour of the lower punch (1) is clearance-fitted with the inner contour of the cavity (21) of the female die (2), and the upper die (3) and the lower punch (1) are respectively arranged on the upper and lower sides of the female die (2), characterized in that: The lower punch (1) has several powder guiding grooves (4) spaced apart on its side wall. The powder guiding grooves (4) are located on the side wall of the lower punch (1) and are not connected to the pressure end face of the lower punch (1). They can guide the powder in the gap between the lower punch (1) and the female mold (2).

2. A cold press die for a cutting head as claimed in claim 1, characterized in that: The lower punch (1) includes an integrally formed pressure head (11) and a connecting rod (12). The shape of the pressure head (11) is adapted to the mold cavity (21) of the female mold (2). The connecting rod (12) is fixed on the punch fixing seat (5) on the cold press. The powder guiding groove (4) is set on the side wall of the pressure head (11).

3. The cold pressing mold for cutting heads as described in claim 2, characterized in that: The punch holder (5) is provided with a positioning groove (51) corresponding to the cavity (21) of the female mold (2), and the lower end of the connecting rod (12) is detachably fixed in the positioning groove (51).

4. The cold pressing die for cutting heads as described in claim 2, characterized in that: The powder guiding groove (4) is an annular groove (41) arranged around the outer peripheral surface of the pressure head (11). The annular groove (41) is arranged sequentially at intervals along the axial direction of the pressure head (11) on the outer peripheral surface of the pressure head (11).

5. The cold pressing die for cutting heads as described in claim 4, characterized in that: The annular groove (41) has a depth of 0.1-0.3 mm, a width of 0.5-1 mm, and a spacing of 2-5 mm between adjacent grooves.

6. The cold pressing mold for cutting heads as described in claim 2, characterized in that: The powder guide groove (4) is a spiral groove (42) arranged around the outer circumference of the pressure head (11). The pitch of the spiral groove (42) is 3-8mm and the depth is 0.1-0.4mm. The projection distance between the starting end and the ending end of the spiral groove (42) on the axial direction of the pressure head (11) is not less than one-third of the length of the pressure head (11).

7. The cold pressing die for cutting heads as described in claim 2, characterized in that: The powder guiding groove (4) is a strip groove (43) arranged along the axial direction of the lower punch (1) on the side wall of the lower punch (1). The strip groove (43) is evenly distributed and spaced around the pressure end face of the lower punch (1) on the side wall of the pressure head (11), and the interval between the strip groove (43) and the pressure end face of the lower punch (1) is 3-8mm.

8. The cold pressing die for cutting heads as described in claim 7, characterized in that: The cross-section of the strip groove (43) is trapezoidal, with a groove opening width of 0.8-1.2mm, a groove bottom width of 0.5-0.8mm, and a depth of 0.2-0.4mm.

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