Bar blank and device and method for inhibiting sintering deformation of bar

Abstract

The invention belongs to the technical field of bar machining, and discloses a bar blank and a device and method for restraining sintering deformation of a bar. The bar sintering deformation restraining device comprises an extrusion mechanism and a grooving mechanism. The extrusion mechanism is provided with an outlet end. The grooving mechanism is arranged at the outlet end of the extrusion mechanism and comprises a translation driving assembly, a rotary driving part and a cutter, the translation driving assembly drives the cutter to move in the radial direction of the bar blank, the rotary driving part drives the cutter to move in the circumferential direction of the bar blank, and the cutter is provided with a groove in the surface of the bar blank. According to the device and method for inhibiting sintering deformation of the bar, the risk of sintering deformation of the bar blank can be reduced, and then the rate of finished products of bar pieces is increased.

Description

Technical Field

[0001] This invention relates to the field of bar processing technology, and in particular to a bar blank, a device and method for suppressing bar sintering deformation. Background Technology

[0002] Cemented carbide is an alloy material made by sintering refractory metal carbides (WC, TiC, TaC, NbC, Cr3C2, etc.) with iron group metals (Co, Ni, and Fe) as binders using powder metallurgy. Cemented carbide combines the advantages of high-hardness refractory metal carbides with the good ductility of binder metals, exhibiting high hardness, strength, and wear resistance, and is widely used in the manufacture of various cutting tools.

[0003] In related technologies, extrusion processes are commonly used to form cemented carbide. For example, when processing cemented carbide bars, the raw materials are mixed and granulated into a mixture, which is then fed into the extruder chamber. By operating the machine, the mixture is extruded from the extrusion nozzle to obtain a bar blank of a specific shape and size. After sintering, the desired alloy product is obtained. The unfinished cemented carbide product with a margin of excess material is then ground on its outer cylindrical surface to obtain the product with the desired surface precision.

[0004] However, the bar stock is prone to significant deformation during sintering. Products with significant deformation will experience localized high temperatures, surface burns, and chipping during subsequent grinding, resulting in a low yield. Summary of the Invention

[0005] The first objective of this application is to provide a device for suppressing sintering deformation of bar stock, so as to solve the technical problem of low yield.

[0006] The second objective of this application is to provide a method for suppressing sintering deformation of bar stock, which can reduce the risk of sintering deformation of bar stock blanks and thereby improve the yield of bar stock parts.

[0007] The third objective of this application is to provide a bar stock with high quality and high yield.

[0008] Based on the above concept, the technical solution adopted in this application is:

[0009] A device for suppressing sintering deformation of bar stock includes:

[0010] An extrusion mechanism, wherein the extrusion mechanism is provided with an outlet end;

[0011] A grooving mechanism is provided at the outlet end of the extrusion mechanism. The grooving mechanism includes a translation drive assembly, a rotation drive component, and a cutter. The translation drive assembly drives the cutter to move radially along the bar blank, and the rotation drive component drives the cutter to move circumferentially along the bar blank. The cutter creates grooves on the surface of the bar blank.

[0012] In one or more embodiments of this application, the translation drive assembly includes an axial drive member and a radial drive member, the cutter is connected to the radial drive member, the radial drive member is connected to the axial drive member, the axial drive member drives the radial drive member to move along the axial direction of the bar stock, and the radial drive member drives the cutter to move radially along the bar stock.

[0013] The rotary drive is located at the outlet end of the extrusion mechanism, and the axial drive is connected to the output end of the rotary drive. The axial drive drives the rotary drive to move along the axial direction of the bar stock, and the rotary drive drives the cutter to rotate around the bar stock.

[0014] In one or more embodiments of this application, the translation drive assembly includes a radial drive member, the cutter is connected to the radial drive member, and the radial drive member drives the cutter to move radially along the bar stock.

[0015] The rotary drive is located at the outlet end of the extrusion mechanism, and the radial drive is connected to the output end of the rotary drive. The rotary drive drives the radial drive and the cutter to move circumferentially along the bar stock.

[0016] A method for suppressing sintering deformation of bar stock, applied to the aforementioned device for suppressing sintering deformation of bar stock, comprises the following steps:

[0017] The translation drive assembly drives the cutter to move closer to the bar blank, so that the cutter abuts against the surface of the bar blank;

[0018] The rotary drive unit drives the cutter to move circumferentially along the bar blank, so that the cutter forms a groove on the surface of the bar blank;

[0019] After forming the groove, the translation drive assembly drives the cutter to move in a direction away from the bar blank, so that the cutter leaves the bar blank;

[0020] Multiple grooves are formed on the surface of the bar blank along the axial direction of the bar blank, and the distance between adjacent grooves is a first preset distance.

[0021] In one or more embodiments of this application, the translation drive assembly includes an axial drive member and a radial drive member;

[0022] The radial drive unit drives the cutter to move toward the bar blank so that the cutter comes into contact with the surface of the bar blank;

[0023] While the rotary drive unit drives the cutter to move circumferentially along the bar blank, the axial drive unit drives the cutter to move along the axial direction of the bar blank at a first speed, and the direction of movement of the cutter is the same as the extrusion direction of the bar blank. The first speed is equal to the speed at which the extrusion mechanism extrudes the bar blank.

[0024] After forming the groove, the radial drive member drives the cutter to move in a direction away from the bar blank, so that the cutter leaves the bar blank.

[0025] In one or more embodiments of this application, the extrusion mechanism extrudes the bar blank at a speed of V, the rotational angular velocity of the rotary drive is R, and the first preset distance is P;

[0026] The rotational angular velocity of the rotary drive component satisfies the following relationship: R = (2πV) / P.

[0027] In one or more embodiments of this application, the extrusion mechanism stops operating while the rotary drive drives the cutter to move circumferentially along the bar blank.

[0028] The bar blank is prepared by the device for suppressing bar sintering deformation as described above or by the method for suppressing bar sintering deformation as described above, and the bar blank has at least one groove.

[0029] In one or more embodiments of this application, the width of the groove ranges from 0.5mm to 1.5mm;

[0030] And / or, the spacing between adjacent grooves in the axial direction of the bar blank ranges from 10mm to 100mm.

[0031] In one or more embodiments of this application, when the outer diameter of the bar blank is 3mm-8mm, the depth of the groove ranges from 0.05mm to 0.15mm;

[0032] When the outer diameter of the bar blank is 9mm-32mm, the depth of the groove is in the range of 0.15mm-0.25mm.

[0033] In one or more embodiments of this application, the groove is an annular groove.

[0034] The beneficial effects of this application are:

[0035] The device for suppressing sintering deformation of bar stock provided in this application, by setting a grooving mechanism at the outlet end of the extrusion mechanism, and the translational drive component of the grooving mechanism carrying the cutter moves radially in the bar stock body, and the rotational drive component drives the cutter to move circumferentially in the bar stock body, thereby cutting out a groove with a certain depth extending circumferentially in the bar stock body. By setting the groove, it is equivalent to introducing a weak point in the bar stock body, guiding and releasing the unpredictable and uncontrollable residual internal stress that is widely distributed in a large area during the sintering process into the specific small area of ​​the groove, thereby reducing the risk of large deformation of the bar stock body. Furthermore, since the internal stress needs to be transmitted through a continuous material medium, the groove extending circumferentially in the bar stock body can cut off the stress transmission path to a certain extent, thereby greatly reducing the overall restraint stress and deformation tendency of the bar stock body. The high straightness of the bar stock body reduces the risk of local high temperature, surface burns, chipping and other problems during subsequent grinding, thereby improving the yield of bar parts.

[0036] The method for suppressing sintering deformation of bars provided in this application is easy to operate and can reduce the risk of sintering deformation of bar blanks, thereby improving the yield of bar parts.

[0037] The bar stock provided in this application has a high yield rate. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of the device for suppressing sintering deformation of bars provided in the embodiments of this application;

[0040] Figure 2 This application Figure 1 The enlarged view at point B is shown below;

[0041] Figure 3 This is a front view of the device for suppressing sintering deformation of bars provided in the embodiments of this application;

[0042] Figure 4 This is a side view of the device for suppressing sintering deformation of bars provided in the embodiments of this application;

[0043] Figure 5 This is a top view of the device for suppressing sintering deformation of bars provided in the embodiments of this application;

[0044] Figure 6 This is a schematic diagram of the structure of the bar blank provided in the embodiments of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Extrusion mechanism; 11. Exit end; 2. Grooving mechanism; 21. Translation drive assembly; 211. Axial drive component; 212. Radial drive component; 22. Rotation drive component; 23. Cutter; 100. Bar blank; 110. Groove; Y, Extrusion direction; X, First direction. Detailed Implementation

[0047] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not all of them.

[0048] It should be understood that the phrase "an embodiment" or "one embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in one embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0052] In the description of this embodiment, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation. They 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, and therefore should not be construed as a limitation of this application. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0053] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0054] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0055] This embodiment provides a device for suppressing sintering deformation of bar stock, which is applied during the extrusion molding process of bar stock. It can reduce the risk of sintering deformation of bar stock and thus improve the yield of bar stock parts.

[0056] It should be noted that the bar blank refers to the workpiece obtained after extrusion. The bar blank needs to be sintered first, and then ground and calibered to obtain the bar part with the required surface accuracy and size. That is, the outer diameter of the bar part is smaller than the outer diameter of the bar blank.

[0057] For example, such as Figures 1 to 5As shown, the device for suppressing sintering deformation of the bar stock includes an extrusion mechanism 1 and a grooving mechanism 2. The extrusion mechanism 1 is used to extrude and form a bar stock blank 100 to obtain a bar stock blank 100 with a specific shape and size. The specific structure of the extrusion mechanism 1 can be found in related art metal extrusion presses. The type of metal extrusion press can be Taiyuan Heavy Machinery, SMS Group, or Danieli, etc., and this embodiment does not limit this.

[0058] In some embodiments, such as Figure 4 As shown, the extrusion mechanism 1 can be mounted on a support, which has a vertical section and an inclined section, with an angle between the inclined section and the vertical section, for example, 45°. The extrusion mechanism 1 is mounted on the inclined section, and the extrusion direction Y of the extrusion mechanism 1 is the same as the extension direction of the inclined section. That is, in this embodiment, the bar stock 100 extruded by the extrusion mechanism 1 does not extend horizontally, but rather extends obliquely downward relative to the horizontal direction; that is, the axial direction of the bar stock 100 is obliquely downward relative to the horizontal direction. In this way, the risk of the bar stock 100 bending and deforming under the action of gravity can be reduced.

[0059] For example, such as Figure 1 As shown, in this embodiment, the extrusion mechanism 1 is provided with an outlet end 11, from which the bar stock 100 is extruded. In this embodiment, the grooving mechanism 2 is provided at the outlet end 11 of the extrusion mechanism 1. For example... Figure 1 and Figure 3 As shown, the grooving mechanism 2 includes a translation drive assembly 21, a rotation drive component 22, and a cutter 23. The cutter 23 is connected to the translation drive assembly 21, and the translation drive assembly 21 drives the cutter 23 to move radially (labeled as the first direction X in this embodiment) along the bar blank 100, while the rotation drive component 22 drives the cutter 23 to move circumferentially along the bar blank 100, so that the cutter 23 forms a groove 110 on the surface of the bar blank 100.

[0060] When using the device for suppressing rod sintering deformation provided in this embodiment, after the extrusion mechanism 1 extrudes a certain length of the rod blank 100, the translation drive assembly 21 drives the cutter 23 to move closer to the rod blank 100 until the cutter 23 abuts against the rod blank 100. The translation drive assembly 21 then drives the cutter 23 to continue moving at a certain feed depth to cut out a groove 110 of a certain depth. At the same time, the rotation drive member 22 drives the cutter 23 to move circumferentially along the rod blank 100, thereby cutting out a groove 110 extending circumferentially along the rod blank 100.

[0061] The device for suppressing rod sintering deformation provided in this embodiment uses a grooving mechanism 2 at the outlet end 11 of the extrusion mechanism 1. The translational drive assembly 21 of the grooving mechanism 2, carrying a cutter 23, moves radially in the rod blank 100. The rotational drive assembly 22 drives the cutter 23 to move circumferentially along the rod blank 100, thereby cutting a groove 110 extending circumferentially along the rod blank 100 and having a certain depth. By setting the groove 110, a weak point is introduced on the rod blank 100, preventing the unpredictable and uncontrollable residual internal defects that are widely distributed over a large area during sintering. Stress is guided and released into the specific small area of ​​the groove 110, thereby reducing the risk of large deformation of the bar blank 100. Furthermore, internal stress needs to be transmitted through a continuous material medium. The groove 110 extending circumferentially along the bar blank 100 can cut off the stress transmission path to a certain extent, thereby greatly reducing the overall restraint stress and deformation tendency of the bar blank 100. The high straightness of the bar blank 100 reduces the risk of local high temperature, surface burns, chipping and other problems during subsequent grinding, thereby improving the yield of bar parts.

[0062] It should be noted that multiple grooves 110 can be formed on the surface of the bar blank 100. In this way, the bar blank 100 is equivalent to dividing the bar blank 100 into several smaller, relatively independent parts along the axial direction. Each small part can expand or contract slightly more freely during the sintering process without being strongly constrained by the adjacent parts, thereby greatly reducing the restraint stress and deformation tendency of the entire bar blank 100.

[0063] In some embodiments, the translation drive assembly 21 includes an axial drive member 211 and a radial drive member 212. The cutter 23 is connected to the output end of the radial drive member 212, and the radial drive member 212 is connected to the output end of the axial drive member 211. The axial drive member 211 drives the radial drive member 212 to move along the axial direction of the bar stock 100, and the radial drive member 212 drives the cutter 23 to move radially along the bar stock 100. By setting the axial drive member 211, the extrusion mechanism 1 can operate without stopping when the cutter 23 cuts the groove 110, thus ensuring that a relatively continuous groove 110 extending circumferentially along the surface of the bar blank 100 is cut. When the rotation drive member 22 rotates around the bar blank 100 for one revolution, an annular groove 110 can also be cut on the bar blank 100. That is, the groove 110 can be an annular groove. The annular groove 110 can better cut off the stress transmission path, thereby further reducing the deformation of the bar blank 100 caused by uneven distribution of thermal stress during sintering, and ensuring the straightness of the bar blank 100.

[0064] In this embodiment, the rotary drive 22 is disposed at the outlet end 11 of the extrusion mechanism 1. For example, the main body of the rotary drive 22 can be installed at the outlet end 11 of the pressurizing mechanism, or on a bracket used to support the extrusion mechanism 1. The axial drive 211 drives the rotary drive 22 to move along the axial direction of the bar blank 100. The rotary drive 22 can drive the cutter 23 to rotate around the bar blank 100. That is, the rotary drive 22 can drive the cutter 23 to move circumferentially around the bar blank 100, thereby cutting out a groove 110 extending circumferentially along the bar blank 100. Of course, it can be understood that the rotary drive 22 can indirectly drive the cutter 23 to rotate around the bar blank 100 by driving the axial drive 211 to rotate around the bar blank 100 through the axial drive 211 and the radial drive 212. This embodiment does not limit this.

[0065] In some optional embodiments, the driving direction of the axial drive member 211 is the same as the extrusion direction Y of the extrusion mechanism 1, that is, the extrusion direction Y of the extrusion mechanism 1 is the same as the axial direction of the bar stock 100. In this way, the situation where the bar stock 100 is deformed due to the radial drive member 212 driving the cutter 23 to move in a different direction from the extrusion direction Y of the extrusion mechanism 1 can be avoided, and the straightness of the bar stock 100 is further improved.

[0066] In other embodiments, the translation drive assembly 21 may include only the radial drive member 212, without the axial drive member 211. In this case, the cutter 23 is connected to the radial drive member 212, which drives the cutter 23 to move radially along the bar stock 100. The radial drive member 212 is connected to the output end of the rotary drive member 22, which drives the radial drive member 212 and the cutter 23 to move circumferentially along the bar stock 100. When the translation drive assembly 21 includes only the radial drive member 212, the formed groove 110 can have two forms. One form is that the extrusion mechanism 1 does not stop operating during the grooving process and continues to extrude the bar stock 100. In this case, the groove 110 is spiral-shaped, and the spiral-shaped groove 110 can also relieve internal stress. The other form of the groove 110 is that the extrusion mechanism 1 stops operating during the grooving process. In this case, the groove 110 can be notched annular or closed annular.

[0067] In at least one possible implementation, both the radial drive member 212 and the axial drive member 211 can be linear drive components such as linear motors and cylinders; this embodiment does not limit this. The output ends of the radial drive member 212 and the axial drive member 211 can be connected directly or indirectly through components such as connecting plates and connecting blocks; this embodiment does not limit this.

[0068] In some embodiments, the rotary drive 22 may include a component capable of outputting torque, such as a rotary motor; this embodiment does not limit this. The connection between the output end of the rotary drive 22 and the axial drive 211 or the radial drive 212 may be a direct connection or an indirect connection through components such as a connecting plate or a connecting block; this embodiment does not limit this.

[0069] The device for suppressing sintering deformation of rods provided in this embodiment can form a groove 110 on the surface of the rod blank 100 through the cooperation of the extrusion mechanism 1 and the grooving mechanism 2. The grooving mechanism 2 is set at the outlet end 11 of the extrusion mechanism 1, which can make full use of the space at the outlet of the extrusion mechanism 1 and can directly perform grooving processing on the rod blank 100 without setting up additional processes. The structure of the grooving mechanism 2 is relatively simple, and the installation and disassembly are not complicated, and the cost is low.

[0070] One embodiment of this application also provides a method for suppressing sintering deformation of bars, which, when applied to the aforementioned device for suppressing sintering deformation of bars, can have the same beneficial effects as the device for suppressing sintering deformation of bars.

[0071] For example, a method for suppressing sintering deformation of bars includes the following steps:

[0072] S1. The translation drive assembly 21 drives the cutter 23 to move towards the bar blank 100 so that the cutter 23 abuts against the surface of the bar blank 100.

[0073] S2. The rotary drive 22 drives the cutter 23 to move circumferentially along the bar blank 100, so that the cutter 23 opens an annular groove 110 on the surface of the bar blank 100.

[0074] S3. After forming a groove 110, the translation drive assembly 21 drives the cutter 23 to move in a direction away from the bar blank 100, so that the cutter 23 leaves the bar blank 100.

[0075] S4. Multiple grooves 110 are formed on the surface of the bar blank 100 along the axial direction of the bar blank 100, and the distance between adjacent grooves 110 is a first preset distance.

[0076] In step S4, multiple grooves 110 are formed sequentially according to steps S1 to S3, and the spacing between the grooves 110 is a first preset distance. The first preset distance can be the minimum distance between grooves 110 or the center distance between grooves 110, and this embodiment does not limit it.

[0077] The method for suppressing rod sintering deformation provided in this embodiment uses a translation drive assembly 21 to drive a cutter 23 to move closer to the rod blank 100 and abut against the surface of the rod blank 100, thereby cutting the surface of the rod blank 100. A rotation drive assembly 22 drives the cutter 23 to run circumferentially along the rod blank 100, thereby cutting a groove 110 extending circumferentially and having a certain depth. By setting the groove 110, a weak point is introduced on the rod blank 100, preventing the widely distributed and unpredictable residual material during sintering from becoming difficult to predict and control. The residual internal stress is guided and released into the specific small area of ​​the groove 110, thereby reducing the risk of large deformation of the bar blank 100. Furthermore, the internal stress needs to be transmitted through a continuous material medium. The groove 110, which extends circumferentially along the bar blank 100, can cut off the stress transmission path to a certain extent, thereby greatly reducing the overall restraint stress and deformation tendency of the bar blank 100. The high straightness of the bar blank 100 will reduce the risk of local high temperature, surface burns, chipping and other problems during subsequent grinding, thereby improving the yield of bar parts.

[0078] In some alternative embodiments, when the translation drive assembly 21 includes an axial drive member 211 and a radial drive member 212, in step S1, the radial drive member 212 drives the cutter 23 to move toward the bar blank 100 so that the cutter 23 abuts against the surface of the bar blank 100.

[0079] In step S2, while the rotary drive 22 drives the cutter 23 to move circumferentially along the bar blank 100, the axial drive 211 drives the cutter 23 to move along the axial direction of the bar blank 100 at a first speed, and the direction of movement of the cutter 23 is the same as the extrusion direction Y of the bar blank 100. The first speed is equal to the speed at which the extrusion mechanism 1 extrudes the bar blank 100. This allows for the formation of an annular groove 110, rather than a spiral groove 110, further reducing the risk of bending deformation of the bar blank 100 during sintering.

[0080] In step S3, after a groove 110 is formed, the radial drive 212 drives the cutter 23 to move in a direction away from the bar blank 100, causing the cutter 23 to leave the bar blank 100. In this way, the surface of the bar blank 100 will not be scratched by the scraper in the area where the groove 110 is not formed.

[0081] In one or more embodiments of this application, the extrusion mechanism 1 extrudes the bar blank 100 at a speed of V, the rotational angular velocity of the rotary drive 22 is R, and the spacing (i.e., the first preset spacing) of the grooves 110 along the axial direction of the bar blank 100 is P. The rotational angular velocity of the rotary drive 22 satisfies the relationship: R = (2πV) / P. When the rotational angular velocity of the rotary drive 22 satisfies this relationship, a closed annular groove 110 can be formed on the bar blank 100, allowing multiple grooves 110 to divide the bar blank 100 into multiple small parts, thereby reducing the risk of deformation of the bar blank 100 and ensuring the straightness of the bar blank 100 and the processed bar parts.

[0082] It should be noted that the speed at which the extrusion mechanism 1 extrudes the bar stock 100 (V), the rotational angular velocity of the rotary drive 22 (R), and the first preset distance (P) all use international standard units. For example, V can be in millimeters per minute, R can be in radians per minute, and P can be in millimeters.

[0083] It is understandable that when the translation drive assembly 21 does not include the axial drive member 211, but only includes the radial drive member 212, in step S2, while the rotary drive member 22 drives the cutter 23 to move circumferentially along the bar blank 100, the extrusion mechanism 1 stops operating. This configuration also forms a closed annular groove 110; that is, the groove 110 can be an annular groove.

[0084] It is understandable that the duration of the extrusion mechanism 1 stopping operation needs to be greater than the duration of the rotation drive 22 rotating around the bar blank 100 once, in order to avoid the cutter 23 interfering with the extrusion operation of the pressure mechanism.

[0085] In one embodiment of this application, such as Figure 6 As shown, this embodiment also provides a rod blank 100, which can be prepared by the above-described device for suppressing rod sintering deformation. Alternatively, the rod blank 100 can also be prepared by the above-described method for suppressing rod sintering deformation, and the specific method can be flexibly selected according to the requirements.

[0086] In some embodiments, such as Figure 6 As shown, the bar stock 100 has at least one groove 110, which reduces the risk of bending deformation of the bar stock 100 during sintering.

[0087] In some optional embodiments, the width W of the groove 110 ranges from 0.5mm to 1.5mm. When the width W of the groove 110 falls within this range, it can alleviate the internal stress of the bar blank 100, reduce the risk of bending deformation during sintering, and ensure the structural strength of the bar blank 100, reducing the risk of bending deformation due to gravity during the extrusion process. The width W of the groove 110 cannot be too large, as this would result in a wider groove 110, affecting the structural strength of the bar blank 100 and increasing the risk of bending deformation during sintering. The width W of the groove 110 cannot be too small, as this would make processing inconvenient and also allow the bar blank 100 to bend due to greater stress during expansion. For example, the width W of the groove 110 can be any value or a range between any two values, such as 0.5mm, 0.8mm, 1mm, 1.2mm, or 1.5mm.

[0088] In some embodiments, the distance between two adjacent grooves 110 along the axial direction of the bar blank 100 (i.e., the first preset distance) ranges from 10mm to 100mm. The distance between two adjacent grooves 110 cannot be too large; if it is, the portion between the two grooves 110 will still have high internal stress and is prone to bending and deformation. The distance between two grooves 110 cannot be too small; if it is too small, it will increase the workload of the grooving mechanism 2, and the extrusion speed of the extrusion mechanism 1 will also be limited, thus affecting the production efficiency of the bar blank 100. For example, the distance between two adjacent grooves 110 along the axial direction of the bar blank 100 can be any value or a range between any two values, such as 10mm, 20mm, 30mm, 50mm, 70mm, 80mm, or 100mm.

[0089] The depth H of the groove 110 is related to the outer diameter of the bar blank 100. In some optional embodiments, when the outer diameter of the bar blank 100 is 3mm-8mm, the depth H of the groove 110 ranges from 0.05mm to 0.15mm. When the outer diameter of the bar blank 100 is 9mm-32mm, the depth H of the groove 110 ranges from 0.15mm to 0.25mm. The depth H of the groove 110 cannot be too large, otherwise the reserved grinding thickness will be small, requiring higher grinding precision and making grinding more difficult. The depth of the groove 110 cannot be too small, otherwise there will still be large internal stress between the two sides of the groove 110, and there is still a risk of deformation.

[0090] For example, when the outer diameter of the bar blank 100 is 3mm-8mm, the depth H of the groove 110 is any value or any two values ​​between 0.05mm, 0.08mm, 0.09mm, 0.1mm, 0.12mm, and 0.15mm. When the outer diameter of the bar blank 100 is 9mm-32mm, the depth H of the groove 110 is any value or any two values ​​between 0.15mm, 0.16mm, 0.18mm, 0.19mm, 0.20mm, 0.22mm, and 0.25mm.

[0091] As shown in Tables 1 to 3, this embodiment also provides a comparison table of the straightness of the bar when the groove 110 is cut and the straightness of the bar when the groove 110 is not cut.

[0092] In Table 1, the diameter of the rod blank 100 is 3 mm, the length is 450 mm, the depth of the groove 110 is H = 0.05 mm, the width of the groove 110 is W = 0.5 mm, and the spacing between adjacent grooves 110 is P = 50 mm. The straightness comparison of the rod parts obtained after sintering is as follows:

[0093]

[0094] As can be seen from Table 1, for a bar blank 100 with a diameter of 3 mm and a length of 450 mm, the straightness of the bar obtained after sintering with the bar blank 100 without the groove 110 is higher than that of the bar obtained after sintering with the bar blank 100 with the groove 110. The maximum difference between the two is 0.221 mm, and the minimum difference is 0.167 mm. It can be seen that setting the groove 110 can effectively improve the straightness of the bar.

[0095] In Table 2, the diameter of the bar blank 100 is 8 mm, the length is 450 mm, the depth of the groove 110 is H = 0.15 mm, the width of the groove 110 is W = 1.0 mm, and the spacing between adjacent grooves 110 is P = 75 mm. The straightness comparison of the bar parts obtained after sintering is as follows:

[0096]

[0097] As can be seen from Table 2, for a bar blank 100 with a diameter of 8 mm and a length of 450 mm, the straightness of the bar obtained after sintering with the bar blank 100 without the groove 110 is higher than that of the bar obtained after sintering with the bar blank 100 without the groove 110. The maximum difference between the two is 0.117 mm and the minimum difference is 0.104 mm. It can be seen that setting the groove 110 can effectively improve the straightness of the bar.

[0098] In Table 3, the diameter of the bar blank 100 is 32 mm, the length is 450 mm, the depth of the groove 110 is H = 0.25 mm, the width of the groove 110 is W = 1.5 mm, and the spacing between adjacent grooves 110 is P = 100 mm. The straightness comparison of the bar parts obtained after sintering is as follows:

[0099]

[0100] As can be seen from Table 3, for a bar blank 100 with a diameter of 32 mm and a length of 450 mm, the straightness of the bar obtained after sintering with the bar blank 100 without the groove 110 is higher than that of the bar obtained after sintering with the bar blank 100 with the groove 110. The maximum difference between the two is 0.081 mm, and the minimum difference is 0.075 mm. It can be seen that setting the groove 110 can effectively improve the straightness of the bar.

[0101] In summary, the presence of the groove 110 causes a sudden decrease in the cross-sectional area of ​​the region containing the groove. According to the mechanical formula σ=F / A (stress = force / cross-sectional area), under the same internal stress, a smaller cross-sectional area A leads to a sharp increase in local stress σ. When residual tensile stress exists within the bar stock 100, it attempts to cause the material to contract or expand. Since the effective cross-sectional area at the groove 110 is the smallest, it becomes a stress concentration point, where local stress reaches the material's yield limit first. Once the yield limit is reached, a small amount of plastic deformation occurs at the root of the groove 110. This plastic deformation, like loosening a taut rope, consumes the elastic potential energy stored within the material, thus significantly reducing the macroscopic internal stress level of the entire bar stock 100. Since internal stress needs to be transmitted through a continuous material medium, an annular groove 110 can physically cut off the stress transmission path. Especially during sintering, inconsistent cooling rates in different regions generate enormous thermal stress. A groove 110 can divide a large, monolithic structure into several smaller, relatively independent parts. Each small section can expand or contract slightly more freely without being strongly constrained by adjacent sections, thus greatly reducing the restraint stress and deformation tendency of the overall structure.

[0102] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A device for suppressing sintering deformation of bar stock, characterized in that, include: The extrusion mechanism (1) is provided with an outlet end (11). The grooving mechanism (2) is located at the outlet end (11) of the extrusion mechanism (1). The grooving mechanism (2) includes a translation drive assembly (21), a rotation drive component (22), and a cutter (23). The translation drive assembly (21) drives the cutter (23) to move radially along the bar blank, and the rotation drive component (22) drives the cutter (23) to move circumferentially along the bar blank. The cutter (23) forms a groove (110) on the surface of the bar blank.

2. The device for suppressing sintering deformation of rods according to claim 1, characterized in that, The translation drive assembly (21) includes an axial drive (211) and a radial drive (212). The cutter (23) is connected to the radial drive (212), and the radial drive (212) is connected to the axial drive (211). The axial drive (211) drives the radial drive (212) to move along the axial direction of the bar stock, and the radial drive (212) drives the cutter (23) to move radially along the bar stock. The rotary drive (22) is disposed at the outlet end (11) of the extrusion mechanism (1). The axial drive (211) is connected to the output end of the rotary drive (22). The axial drive (211) drives the rotary drive (22) to move along the axial direction of the bar blank. The rotary drive (22) drives the cutter (23) to rotate around the bar blank.

3. The device for suppressing sintering deformation of rods according to claim 1, characterized in that, The translation drive assembly (21) includes a radial drive member (212), and the cutter (23) is connected to the radial drive member (212). The radial drive member (212) drives the cutter (23) to move radially along the bar blank. The rotary drive (22) is disposed at the outlet end (11) of the extrusion mechanism (1), and the radial drive (212) is connected to the output end of the rotary drive (22). The rotary drive (22) drives the radial drive (212) and the cutter (23) to rotate around the bar blank.

4. A method for suppressing sintering deformation of bar stock, applied to the device for suppressing sintering deformation of bar stock as described in any one of claims 1-3, characterized in that, The method for suppressing sintering deformation of the bar material includes the following steps: The translation drive assembly (21) drives the cutter (23) to move toward the bar blank so that the cutter (23) abuts against the surface of the bar blank; The rotary drive (22) drives the cutter (23) to move circumferentially along the bar blank, so that the cutter (23) forms a groove (110) on the surface of the bar blank. After forming the groove (110), the translation drive assembly (21) drives the cutter (23) to move in a direction away from the bar blank, so that the cutter (23) leaves the bar blank; A plurality of grooves (110) are formed on the surface of the bar blank along the axial direction of the bar blank, and the spacing between adjacent grooves (110) is a first preset distance.

5. The method for suppressing sintering deformation of rods according to claim 4, characterized in that, The translation drive assembly (21) includes an axial drive (211) and a radial drive (212). The radial drive (212) drives the cutter (23) to move toward the bar blank so that the cutter (23) abuts against the surface of the bar blank; While the rotary drive (22) drives the cutter (23) to move circumferentially along the bar blank, the axial drive (211) drives the cutter (23) to move along the axial direction of the bar blank at a first speed, and the direction of movement of the cutter (23) is the same as the extrusion direction (Y) of the bar blank. The first speed is equal to the speed at which the extrusion mechanism (1) extrudes the bar blank. After forming the groove (110), the radial drive (212) drives the cutter (23) to move in a direction away from the bar blank, so that the cutter (23) leaves the bar blank.

6. The method for suppressing sintering deformation of bars according to claim 4, characterized in that, The extrusion mechanism (1) extrudes the rod blank at a speed of V, the rotational angular velocity of the rotary drive (22) is R, and the first preset distance is P; The rotational angular velocity of the rotary drive (22) satisfies the following relationship: R = (2πV) / P.

7. The method for suppressing sintering deformation of bars according to claim 4, characterized in that, While the rotary drive (22) drives the cutter (23) to move circumferentially along the bar blank, the extrusion mechanism (1) stops operating.

8. A bar billet, characterized in that, The rod blank is prepared by using the device for suppressing rod sintering deformation as described in any one of claims 1 to 3 or by using the method for suppressing rod sintering deformation as described in any one of claims 4 to 7, wherein the rod blank has at least one groove (110).

9. The bar billet according to claim 8, characterized in that, The width of the groove (110) ranges from 0.5mm to 1.5mm; And / or, the spacing between adjacent grooves (110) in the axial direction of the bar blank is in the range of 10mm-100mm; And / or, the groove (110) is an annular groove.

10. The bar billet according to claim 8, characterized in that, When the outer diameter of the bar blank is 3mm-8mm, the depth of the groove (110) is in the range of 0.05mm-0.15mm; When the outer diameter of the bar blank is 9mm-32mm, the depth of the groove (110) is in the range of 0.15mm-0.25mm.

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