Cyclic loading mold device for removing residual internal stress of hard alloy blank and using method

Abstract

The cyclic loading mold device for removing the residual internal stress of the hard alloy workblank comprises a first module, the first module comprises a middle mold frame, a plurality of first guide holes are formed in the middle mold frame, a movable sliding rod is arranged in each first guide hole in a penetrating mode, and a clamping block is connected to each movable sliding rod; the clamping blocks abut against the side end face of the hard alloy blank. A movable pressure head is installed in the middle mold frame, the end face of one side of the movable pressure head is attached to the end face of the hard alloy blank and located between the clamping blocks, a fixed pressure head is connected to the movable pressure head, a fixing assembly is arranged at the position, corresponding to the first guide hole, of the middle mold frame, and the movable sliding rod is fixed through the fixing assembly; a guide sleeve is sleeved on the movable pressure head in the middle mold frame; and one end, close to the hard alloy blank, of the guide sleeve is mounted between the clamping blocks. According to the device, the dynamic pressure head can be tightly attached to the pressed surface of the hard alloy blank, so that the residual internal stress of the hard alloy blank is effectively removed, and the stress eliminating efficiency and quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cemented carbide preparation, and in particular to a cyclic loading die device for removing residual internal stress of a cemented carbide blank and a use method thereof. Background Art

[0002] As an indispensable tool material in the field of machining, cemented carbide plays a vital role in improving machining accuracy and efficiency with its excellent hardness and toughness. This alloy usually uses tungsten carbide (WC) and cobalt (Co) powder as the main raw materials and is manufactured through a series of complex powder metallurgy process steps, including fine processing of powder to ensure the uniformity of particle distribution, molding to give the material the desired shape, and high-temperature sintering process to enhance the bonding force between particles. Finally, post-processing is required to optimize its physical and mechanical properties.

[0003] During the sintering and cooling stages of cemented carbide, there is a significant difference in thermal expansion coefficients between the WC hard phase and the Co bonding phase, and the temperature distribution of the inner and outer layers of the sintered blank is uneven, forming a temperature gradient. These factors work together to cause residual internal stresses inside the alloy. These internal stresses are the root cause of cracks or chipping in the tool during subsequent machining, which seriously affects the tool's service life and processing quality.

[0004] In order to effectively remove these residual internal stresses, a micro-plastic deformation technology based on cyclic loading is proposed. This technology applies periodic loads to the cemented carbide blank to cause it to undergo tiny plastic deformation, thereby releasing and redistributing the internal stress, thereby reducing or eliminating residual stress. This method can not only improve the mechanical properties of the tool, but also enhance its stability and durability during use.

[0005] However, when implementing this technology in a traditional integral rigid mold, the blank is fixed in the mold cavity formed by the upper mold and the lower mold through a clamping structure. During the clamping process, the blank is positioned and leveled through manual adjustment with the help of measuring tools. Then, a mold pressure head is installed on the blank, the mold pressure head is supported by auxiliary tools, and pressure is applied to the mold pressure head through a pressurizing device to remove the residual internal stress in the blank. Although this method can remove the residual internal stress in the blank, during the installation of the pressure head and the two parts, due to manual installation errors, it is easy to cause incomplete contact between the mold pressure head and the pressure surface of the cemented carbide blank, especially in the corner area of ​​the blank, resulting in uneven stress distribution. Due to insufficient force in the corner area, the residual stress inside is difficult to be effectively released, resulting in poor removal of residual internal stress in the corners of the blank. Summary of the invention

[0006] In order to solve the problem that when a traditional rigid mold removes residual stress in a blank, the contact between the mold pressure head and the pressure surface of the cemented carbide blank is incomplete, resulting in poor removal effect of residual internal stress in the corners of the blank, the present invention provides a cyclic loading mold device for removing residual internal stress in a cemented carbide blank and a use method thereof.

[0007] To achieve the above object, the present invention provides the following technical solutions: The present invention provides a cyclic loading die device for removing residual internal stress of a cemented carbide blank, comprising a first module, wherein the cemented carbide blank is clamped in the first module, and dynamic pressure heads are respectively installed at the top and the bottom of the cemented carbide blank in the first module; The first module comprises a middle mold frame, the middle mold frame is provided with a plurality of first guide holes, a movable slide rod is passed through each of the first guide holes, one end of the movable slide rod extends into the middle mold frame, and the other end of the movable slide rod extends to the outside of the middle mold frame, a clamping block is connected to the inner end of the movable slide rod through a first ball groove assembly, and the clamping block is pushed on the side end surface of the cemented carbide blank; Dynamic pressure heads are installed at the top and bottom of the cemented carbide blank in the middle mold frame, respectively. One end face of the dynamic pressure head fits the end face of the cemented carbide blank and is located between the clamping blocks. A fixed pressure head is connected to the side of the dynamic pressure head away from the cemented carbide blank through a second ball groove assembly. The fixed pressure head is used to connect a pressurizing device. A fixing component is provided on the middle mold frame at a position corresponding to the first guide hole, and the movable sliding rod is fixed by the fixing component; A guide sleeve is provided on the dynamic pressure head in the middle mold frame, and one end of the guide sleeve close to the cemented carbide blank is installed between the clamping blocks.

[0008] Preferably, a sliding layer is provided between the guide sleeve and the dynamic pressure head.

[0009] Preferably, the dimension of the end surface of one end of the dynamic pressure head that is in contact with the cemented carbide blank is the same as the dimension of the end surface of the cemented carbide blank.

[0010] Preferably, the first ball groove assembly includes a first ball head and a first groove, the first groove is engaged with the first ball head, the first ball head is fixed to the inner end head of the movable slide rod, and the first groove is arranged on the outer end face of the clamping block.

[0011] Preferably, the second ball groove assembly includes a second ball head and a second groove, the second ball head is engaged with the second groove, the second ball head is fixed to the inner end head of the fixed pressure head, and the second groove is arranged on the outer end head of the dynamic pressure head.

[0012] Preferably, a second module is provided on the middle mold frame at the position of the constant pressure head, the second module includes an end mold frame, the end mold frame is connected to the middle mold frame, the constant pressure head passes through the end mold frame, and a straightening assembly is provided on the side of the constant pressure head in the end mold frame, and the straightening assembly is used to straighten the constant pressure head.

[0013] Preferably, the straightening assembly includes a fixed baffle plate, one side end surface of the fixed baffle plate is in contact with the side end surface of the fixed pressure head, a connecting platform is provided at the center position of the other side end surface of the fixed baffle plate, a threaded hole is provided on the connecting platform, one end of a fixed sliding rod is connected to the threaded hole, a second guide hole is provided on the end mold frame, the other end of the fixed sliding rod passes through the second guide hole and extends to the outside of the end mold frame, the fixing assembly is also provided at the position of the end mold frame corresponding to the second guide hole, and the fixing assembly fixes the fixed sliding rod.

[0014] Preferably, the fixing assembly includes a fixing sleeve arranged on the outer wall of the end mold frame at a position corresponding to the second guide hole and on the middle mold frame at a position corresponding to the first guide hole, and the fixing sleeve is provided with a fastening bolt, and the fastening bolt is used to fix the fixed sliding rod and the movable sliding rod to the fixing sleeve.

[0015] Preferably, a threaded connection hole is provided on the end surface of the middle mold frame, and a through hole is provided on the end surface of the end mold frame. A pin bolt is passed through the through hole, and the inner end of the pin bolt is installed in the threaded connection hole.

[0016] The present invention provides a method for using a cyclic loading die device for removing residual internal stress of a cemented carbide blank, which comprises the following steps: Matching the dynamic pressure head and the fixed pressure head according to the shape and size of the pressure-bearing surface of the cemented carbide blank, and connecting the dynamic pressure head and the fixed pressure head through a second ball-groove assembly; Move the carbide blank into the middle mold frame of the first module, clamp it with the clamping block, connect the clamping block with the movable slide rod through the first ball groove assembly, pass one end of the slide rod through the first guide groove, One end of the dynamic pressure head connected with the fixed pressure head through the second ball groove assembly is tightly fitted to the end surface of the cemented carbide blank, a guide sleeve is sleeved on the outer side of the dynamic pressure head, and the center line angle between the fixed pressure head and the dynamic pressure head is adjusted to 180°; the fixing assembly is adjusted to fix the movable slide rod; The hydraulic equipment is used to cyclically load the fixed pressure head with pressure, and the cemented carbide blank is cyclically loaded. After the residual internal stress in the cemented carbide blank is removed, the fixing component is loosened to complete the removal of the residual internal stress of the cemented carbide blank.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes a cyclic loading die device for removing residual internal stress of a cemented carbide blank. The device fixes and positions the cemented carbide blank through a first module, that is, the movable slide bar and the clamping block in the first module accurately push the side of the cemented carbide blank to ensure the stability of the blank during the force-bearing process. The flexible connection of the first ball groove assembly enables the clamping block to be fine-tuned according to the actual shape of the blank, thereby improving the uniformity and accuracy of stress elimination. The coordinated use of the dynamic pressure head and the fixed pressure head provides stable pressure in both the upper and lower directions for the cemented carbide blank, effectively simulating the stress state in actual work, and contributing to a more comprehensive The residual stress inside the blank is released effectively. The second ball groove assembly makes the connection between the dynamic pressure head and the fixed pressure head more stable and has a certain buffering effect, avoiding damage to the blank caused by excessive pressure. The fixing assembly ensures the stability of the movable slide bar during loading and prevents the stress elimination effect from decreasing due to the shaking of the movable slide bar. The guide sleeve provides precise guiding for the dynamic pressure head, further enhancing the stability and durability of the entire mold device. Therefore, the device can achieve effective removal of the residual internal stress of the cemented carbide blank by closely fitting the dynamic pressure head with the pressure surface of the cemented carbide blank, which not only improves the efficiency and quality of stress elimination.

[0018] Furthermore, the device sets a sliding layer between the guide sleeve and the dynamic pressure head, which can significantly reduce the friction resistance between the two, making the dynamic pressure head move more smoothly during the loading process, reducing energy consumption and extending the service life of the mold, while ensuring the accuracy and uniformity of stress elimination, further improving the overall processing efficiency and effect.

[0019] Furthermore, in the present device, the clamping block and the movable sliding rod are connected by means of the first ball head and the first groove, and the fixed pressure head and the dynamic pressure head are connected by means of the second ball head and the second groove, thereby enhancing the connection stability and flexibility between the movable sliding rod and the clamping block, and the fixed pressure head and the dynamic pressure head, so that the various components can cooperate closely and work together during the loading process, and through the engagement method of the ball head and the groove, good buffering and adaptive adjustment functions are achieved, effectively avoiding damage to the blank caused by stress concentration or uneven loading.

[0020] Furthermore, in this device, a second module is added to the position of the fixed pressure head on the middle mold frame. The second module fixes the fixed pressure head through a fixed baffle and a fixed sliding rod to ensure stability during the loading process of the fixed pressure head, thereby improving the overall stability and durability of the mold device, and significantly improving the efficiency and effect of removing residual internal stress of the cemented carbide blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1A schematic diagram of a cyclic loading die device for removing residual internal stress of a cemented carbide blank proposed by the present invention; Figure 2 A cross-sectional schematic diagram of a cyclic loading die device for removing residual internal stress of a cemented carbide blank proposed by the present invention; Figure 3 A schematic diagram of the connection between a fixed slide rod and a fixed baffle plate in a cyclic loading die device for removing residual internal stress of a cemented carbide blank proposed by the present invention; Figure 4 A schematic diagram of the connection between a fixed pressure head and a dynamic pressure head in a cyclic loading die device for removing residual internal stress of a cemented carbide blank proposed by the present invention; In the attached drawings: 1. fixed pressure head; 2. end mold frame; 3. fixed sliding rod; 4. middle mold frame; 5. movable sliding rod; 6. dynamic pressure head; 7. pin bolt; 8. fixed baffle; 9. fastening bolt; 10. guide sleeve; 11. clamping block; 12. fixing sleeve; 13. first ball head; 14. first groove; 15. second ball head; 16. second groove. DETAILED DESCRIPTION

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] See also Figure 1~Figure 4 The present invention proposes a cyclic loading mold device for removing residual internal stress of a cemented carbide blank. The device includes a first module and a second module. The upper and lower end heads of the first module are respectively connected to the second modules. The cemented carbide blank is fixed and positioned by the first module, so that the cemented carbide blank is in full contact with the first module, so that the pressure surface of the cemented carbide blank can be evenly compressed, and the residual internal stress in the cemented carbide blank is effectively and quickly removed. The second module is used for auxiliary fixing and positioning, so as to further increase the uniformity of the force on the pressure surface of the cemented carbide blank.

[0029] See also Figure 1~Figure 4The first module includes a middle mold frame 4, which is a square mold frame. A plurality of first guide holes are arranged on the outer wall of the middle mold frame 4, that is, a second guide hole is arranged on each side of the square mold frame, and the axes of the first guide holes arranged on the two opposite side end faces of the square mold frame are collinear, and a movable slide rod 5 is inserted in each first guide hole, and one end of the movable slide rod 5 extends to the inside of the middle mold frame 4, and the other end of the movable slide rod 5 extends to the outside of the middle mold frame 4. A clamping block 11 is connected to the inner end of the movable slide rod 5 through a first ball groove assembly, and the clamping block 11 is pushed on the side end face of the cemented carbide blank. The first ball groove assembly includes a first ball head 13 and a first groove 14, and the first groove 14 and the first ball head 13 are connected to the first ball head 13. The first ball head 13 is engaged, the first ball head 13 is fixed on the inner end of the movable slide rod 5, and the first groove 14 is arranged on the outer end face of the clamping block 11, which helps to better adapt to the slight unevenness or deformation of the surface of the cemented carbide blank, ensures that the clamping force can be evenly distributed, and avoids damage caused by excessive local pressure. At the same time, through the close cooperation of the first ball head 13 and the first groove 14, the overall stability of the cemented carbide blank clamping is enhanced, which helps to maintain the stable contact between the clamping block 11 and the cemented carbide blank during the cyclic loading process, and ensures the accurate transmission of the loading force. The first ball head 13 and the first groove 14 make the installation and disassembly of the clamping block 11 easier, without complicated fasteners or adjustment processes. This not only improves work efficiency, but also facilitates subsequent maintenance and replacement work.

[0030] See also Figure 1 , Figure 2 and Figure 4 A dynamic pressure head 6 is installed at the top and bottom of the cemented carbide blank in the middle mold frame 4, and one end face of the dynamic pressure head 6 fits the end face of the cemented carbide blank and is located between the clamping blocks 11. The end face size of the dynamic pressure head 6 that fits the cemented carbide blank is the same as the end face size of the cemented carbide blank. A fixed pressure head 1 is connected to the side of the dynamic pressure head 6 away from the cemented carbide blank through a second ball groove assembly. The fixed pressure head 1 is used to connect a pressurizing device. The fixed pressure head 1 limits the lateral displacement or movement of the dynamic pressure head 6. The end face area of ​​the fixed pressure head 1 is the same as the end face area of ​​the dynamic pressure head 6. The second ball groove assembly includes a second ball head 15 and a second groove 16, the second ball head 15 is engaged with the second groove 16, the second ball head 15 is fixed on the inner end of the fixed pressure head 1, and the second groove 16 is arranged on the outer end of the dynamic pressure head 6. The dynamic pressure head 6 is connected with the fixed pressure head 1 through the second ball groove assembly. On the one hand, without affecting the pressure transmission, the flexibility and coordination of the dynamic pressure head 6 and the fixed pressure head 1 are improved, so that the dynamic pressure head 6 and the pressure surface of the cemented carbide blank are closely fitted to make the force uniform. On the other hand, it is convenient for the dynamic pressure head 6 and the fixed pressure head 1 to be independently controlled. The end face shape and size of the dynamic pressure head 6 can be selected according to the pressure surface shape and size of the cemented carbide blank, and the shape selection of the fixed pressure head 1 is not affected. See also Figure 2 A guide sleeve 10 is provided on the dynamic pressure head 6 in the middle mold frame 4. The end of the guide sleeve 10 close to the cemented carbide blank is installed between the clamping blocks 11. The setting of the guide sleeve 10 ensures the stability and accuracy of the dynamic pressure head 6 when applying pressure, and provides a fixed path for the movement of the dynamic pressure head 6, so that the dynamic pressure head 6 can move smoothly and accurately, avoiding uneven loading or errors caused by offset or shaking. The guide sleeve 10 is also used to fix and support the dynamic pressure head 6, and adjust and limit the rotation of the dynamic pressure head 6. A sliding layer is provided between the guide sleeve 10 and the dynamic pressure head 6, which can effectively reduce the resistance of the dynamic pressure head 6 during movement, making the loading process smoother and more efficient. The close fit between the guide sleeve 10 and the dynamic pressure head 6 ensures the uniform distribution of the loading force, which helps to maintain the stability and consistency of the loading force during the cyclic loading process, thereby more effectively removing the residual internal stress in the cemented carbide blank.

[0031] See also Figure 1~Figure 4 A second module is respectively arranged at the upper end port and the lower end port of the middle mold frame 4, and the second module includes an end mold frame 2, a threaded connection hole is arranged on the end face of the middle mold frame 4, a through hole is arranged on the end face of the end mold frame 2, a column pin bolt 7 is passed through the through hole, and the inner end of the column pin bolt 7 is installed in the threaded connection hole to connect the end mold frame 2 with the middle mold frame 4, and the end mold frame 2 and the middle mold frame 4 are connected by the column pin bolt 7. On the one hand, it is convenient for the loading and unloading of the end mold frame 2 and the middle mold frame 4, and it is easy to replace accessories and repair. On the other hand, the end mold frame 2 and the middle mold frame 4 are combined to form a rigid whole, which is conducive to the coordinated application of multiple structures. The fixed pressure head 1 passes through the end mold frame 2, and a straightening assembly is arranged on the side of the fixed pressure head 1 in the end mold frame 2. The straightening assembly is used to straighten the fixed pressure head 1, and cooperates with the movable sliding rod 5 to ensure the flexibility of the movable pressure head 6 and the cemented carbide blank to rotate around the central axis of the device, and prevent lateral movement.

[0032] See also Figure 1~Figure 4 The straightening assembly includes a fixed baffle plate 8, one side end surface of the fixed baffle plate 8 is in contact with the side end surface of the fixed pressure head 1, a connecting platform is provided at the center position of the other side end surface of the fixed baffle plate 8, a threaded hole is provided on the connecting platform, one end of a fixed sliding rod 3 is connected in the threaded hole, a second guide hole is provided on the end mold frame 2, the other end of the fixed sliding rod 3 passes through the second guide hole and extends to the outside of the end mold frame 2, and the fixed pressure head 1 is ensured to move up and down and prevent lateral movement or rotation through the fixed baffle plate 8, the fixed sliding rod 3 and the end mold frame 2.

[0033] See also Figure 1 and Figure 2The position of the end mold frame 2 corresponding to the second guide hole is also provided with a fixing component, which fixes the fixed slide bar 3, and the position of the middle mold frame 4 corresponding to the first guide hole is provided with a fixing component, and the movable slide bar 5 is fixed by the fixing component; the fixing component includes a fixing sleeve 12 provided at the position corresponding to the second guide hole on the outer wall of the end mold frame 2 and at the position corresponding to the first guide hole on the middle mold frame 4, and a fastening bolt 9 is provided on the fixing sleeve 12, and the fastening bolt 9 is used to fix the fixed slide bar 3 and the movable slide bar 5 on the fixing sleeve 12. The fixing component significantly enhances the overall structural stability of the mold device through the interaction between the fixing sleeve 12 and the fastening bolt 9. This helps to ensure the close fit and coordinated movement between the various parts of the mold during the loading process.

[0034] The present invention also discloses a method for using a cyclic loading die device for removing residual internal stress of a cemented carbide blank, which is used to use the above-mentioned device, comprising the following steps: Matching the dynamic pressure head and the fixed pressure head according to the shape and size of the pressure-bearing surface of the cemented carbide blank, and connecting the dynamic pressure head and the fixed pressure head through a second ball groove assembly; Move the carbide blank into the middle mold frame of the first module, clamp it by the clamping block, connect the clamping block and the movable slide rod through the first ball groove assembly, and pass one end of the slide rod through the first guide groove; One end of the dynamic pressure head connected with the fixed pressure head through the second ball groove assembly is tightly fitted to the end surface of the cemented carbide blank, a guide sleeve is sleeved on the outer side of the dynamic pressure head, and the center line angle between the fixed pressure head and the dynamic pressure head is adjusted to 180°; the fixing assembly is adjusted to fix the movable slide rod; The hydraulic equipment is used to cyclically load the fixed pressure head, and the cemented carbide blank is cyclically loaded. After the residual internal stress in the cemented carbide blank is removed, the fixing component is loosened to complete the removal of the residual internal stress of the cemented carbide blank.

[0035] Furthermore, the dynamic pressure head is matched according to the shape and size of the pressure surface of the cemented carbide blank, the cemented carbide blank is placed between the upper and lower dynamic pressure heads, and the guide sleeve is closely fitted to the blank and the dynamic pressure head by adjusting the movable slide bar, and then the movable slide bar is locked with the fastening screws on the middle mold frame; The selected fixed pressure head and dynamic pressure head are connected through the second ball groove assembly, and then the end mold frame is connected to the middle mold frame and the pin bolts are tightened. The fixed slide rod is adjusted so that the four fixed baffles fit tightly with the fixed pressure head, and the center line angle between the fixed pressure head and the dynamic pressure head is 180°. Then the fixed slide rod is locked with the fastening screws on the end mold frame; The hydraulic equipment is used to cyclically load the fixed pressure head, and then the cemented carbide blank is cyclically loaded. After completion, the fastening bolts are loosened, the sample is unloaded, and the mold is inspected to complete the removal of the residual internal stress of the cemented carbide blank.

[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0037] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A cyclic loading die device for removing residual internal stress of a cemented carbide blank, characterized in that: It comprises a first module, in which a cemented carbide blank is clamped, and in which dynamic pressure heads (6) are respectively installed at positions on the top and the bottom of the cemented carbide blank in the first module; The first module comprises a middle mold frame (4), the middle mold frame (4) is provided with a plurality of first guide holes, a movable slide rod (5) is passed through each of the first guide holes, one end of the movable slide rod (5) extends into the middle mold frame (4), and the other end of the movable slide rod (5) extends to the outside of the middle mold frame (4), and a clamping block (11) is connected to the inner end of the movable slide rod (5) through a first ball groove assembly, and the clamping block (11) is pushed on the side end surface of the cemented carbide blank; The dynamic pressure heads (6) are respectively installed at the top and bottom of the cemented carbide blank in the middle mold frame (4), one end face of the dynamic pressure head (6) is in contact with the end face of the cemented carbide blank and is located between the clamping blocks (11), and a fixed pressure head (1) is connected to the side of the dynamic pressure head (6) away from the cemented carbide blank via a second ball groove assembly, and the fixed pressure head (1) is used to connect to a pressurizing device; A fixing component is provided at a position on the middle mold frame (4) corresponding to the first guide hole, and the movable sliding rod (5) is fixed by the fixing component; A guide sleeve (10) is sleeved on the dynamic pressure head (6) in the middle mold frame (4), and one end of the guide sleeve (10) close to the cemented carbide blank is installed between the clamping blocks (11).

2. A cyclic loading die device for removing residual internal stress of a cemented carbide blank according to claim 1, characterized in that: A sliding layer is provided between the guide sleeve (10) and the dynamic pressure head (6).

3. A cyclic loading die device for removing residual internal stress of a cemented carbide blank according to claim 1, characterized in that: The dimension of the end face of one end of the dynamic pressure head (6) that is in contact with the cemented carbide blank is the same as the dimension of the end face of the cemented carbide blank.

4. A cyclic loading die device for removing residual internal stress of a cemented carbide blank according to claim 1, characterized in that: The first ball groove assembly comprises a first ball head (13) and a first groove (14), the first groove (14) being engaged with the first ball head (13), the first ball head (13) being fixed to the inner end of the movable slide rod (5), and the first groove (14) being arranged on the outer end surface of the clamping block (11).

5. The cyclic loading die device for removing residual internal stress of cemented carbide blank according to claim 1, characterized in that: The second ball groove assembly comprises a second ball head (15) and a second groove (16), the second ball head (15) being engaged with the second groove (16), the second ball head (15) being fixed to the inner end of the fixed pressure head (1), and the second groove (16) being arranged on the outer end of the dynamic pressure head (6).

6. A cyclic loading die device for removing residual internal stress of a cemented carbide blank according to claim 1, characterized in that: A second module is arranged on the middle mold frame (4) at the position of the constant pressure head (1), the second module comprising an end mold frame (2), the end mold frame (2) being connected to the middle mold frame (4), the constant pressure head (1) passing through the end mold frame (2), and a straightening component is arranged on the side of the constant pressure head (1) in the end mold frame (2), the straightening component being used to straighten the constant pressure head (1).

7. A cyclic loading die device for removing residual internal stress of a cemented carbide blank according to claim 6, characterized in that: The straightening assembly comprises a fixed baffle plate (8), one end surface of which is in contact with the side end surface of the fixed pressure head (1); a connecting platform is provided at a central position on the other end surface of the fixed baffle plate (8); a threaded hole is provided on the connecting platform, one end of a fixed slide rod (3) is connected to the threaded hole; a second guide hole is provided on the end mold frame (2); the other end of the fixed slide rod (3) passes through the second guide hole and extends to the outside of the end mold frame (2); the fixing assembly is also provided at a position of the end mold frame (2) corresponding to the second guide hole, and the fixing assembly fixes the fixed slide rod (3).

8. A cyclic loading die device for removing residual internal stress of a cemented carbide blank according to claim 7, characterized in that: The fixing assembly comprises a fixing sleeve (12) which is arranged on the outer wall of the end mold frame (2) at a position corresponding to the second guide hole and on the middle mold frame (4) at a position corresponding to the first guide hole. The fixing sleeve (12) is provided with a fastening bolt (9). The fastening bolt (9) is used to fix the fixed sliding rod (3) and the movable sliding rod (5) to the fixing sleeve (12).

9. A cyclic loading die device for removing residual internal stress of a cemented carbide blank according to claim 6, characterized in that: A threaded connection hole is provided on the end surface of the middle mold frame (4), and a through hole is provided on the end surface of the end mold frame (2). A pin bolt (7) is passed through the through hole, and the inner end of the pin bolt (7) is installed in the threaded connection hole.

10. A method for using a cyclic loading die device for removing residual internal stress of a cemented carbide blank, used for using the device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Matching the dynamic pressure head and the fixed pressure head according to the shape and size of the pressure-bearing surface of the cemented carbide blank, and connecting the dynamic pressure head and the fixed pressure head through a second ball-groove assembly; Move the carbide blank into the middle mold frame of the first module, clamp it by the clamping block, connect the clamping block and the movable slide rod through the first ball groove assembly, and pass one end of the slide rod through the first guide groove; One end of the dynamic pressure head connected with the fixed pressure head through the second ball groove assembly is tightly fitted to the end surface of the cemented carbide blank, a guide sleeve is sleeved on the outer side of the dynamic pressure head, and the center line angle between the fixed pressure head and the dynamic pressure head is adjusted to 180°; the fixing assembly is adjusted to fix the movable slide rod; The hydraulic equipment is used to cyclically load the fixed pressure head with pressure, and the cemented carbide blank is cyclically loaded. After the residual internal stress in the cemented carbide blank is removed, the fixing component is loosened to complete the removal of the residual internal stress of the cemented carbide blank.

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