Stress relieving process for hard alloy

Abstract

The invention relates to the technical field of stress relief, and discloses a stress relief process of a hard alloy, which comprises the following steps: step 1, gradually cooling the hard alloy of which the stress is to be relieved from room temperature to-100 to-80 DEG C, keeping for 1-1.5 hours, then gradually heating to-20 to 0 DEG C, keeping for 1-1.5 hours in the process of gradually heating to-20 to 0 DEG C, and keeping for 1-1.5 hours in the process of gradually heating to-20 to 0 DEG C; the hard alloy is subjected to vibration operation at the same time, and the vibration frequency is gradually increased in the process that the temperature is increased to-20 DEG C to 0 DEG C; and secondly, the hard alloy is continuously kept at the temperature ranging from-20 DEG C to 0 DEG C for 1 h to 1.5 h, and in the keeping process, the vibration effect on the hard alloy is continuously conducted. According to the method, the stress of the hard alloy is eliminated in a mode of raising the temperature after cooling, in the process of raising the temperature in a low-temperature state after cooling, the stress is eliminated through cooperation of a vibration mode, and when the temperature is raised to a slightly high temperature, the hard alloy is knocked, so that the purpose of thoroughly eliminating the internal stress of the hard alloy can be achieved; and the interval of cooling and heating is reduced, and less energy is consumed.

Description

Technical Field

[0001] The invention relates to the technical field of stress elimination, in particular to a stress elimination process of cemented carbide. Background Art

[0002] Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc. It is widely used in industrial production and processing. Stress is the internal force that interacts between the various parts of an object when the object is deformed due to external factors (force, humidity, temperature field changes, etc.). The internal force per unit area is called stress. The stress perpendicular to the cross section is called normal stress or normal stress, and the stress tangent to the cross section is called shear stress or shear stress. The effect of stress on the performance of the material is fatal. If the stress is not eliminated, the material will crack during processing or use. If the stress is too large, it will also cause many special-shaped parts. Therefore, it is necessary to perform stress elimination on cemented carbide. The existing stress elimination methods include: heating or cooling, vibration, mechanical processing, plastic deformation and chemical treatment.

[0003] The prior art requires multiple or long-term actions when using the above-mentioned method to eliminate stress, and the temperature drop and temperature rise interval is relatively large, which consumes more energy. Otherwise, it is difficult to completely eliminate the stress inside the cemented carbide. In order to improve the stress elimination effect and ensure the production and processing efficiency, we propose a stress elimination process for cemented carbide. Summary of the invention

[0004] The purpose of the present invention is to provide a stress elimination process for cemented carbide, which eliminates stress on cemented carbide by heating up after cooling, and in the process of heating up at a low temperature after cooling, uses vibration to eliminate stress. When the temperature is raised to a slightly higher temperature, the cemented carbide is struck, which can achieve the purpose of more thoroughly eliminating the internal stress of the cemented carbide, reduce the interval of cooling and heating, and consume less energy, thereby solving the problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a stress relief process for cemented carbide, comprising the following steps:

[0006] Step 1: gradually cool the cemented carbide to be stress-relieved from room temperature to -100--80°C, keep it for 1-1.5 hours, and then gradually heat it up to -20-0°C. During the process of gradually heating up to -20-0°C, vibrate the cemented carbide at the same time. During the process of heating up to -20-0°C, the vibration frequency gradually increases;

[0007] Step 2: Keep the cemented carbide at -20-0℃ for 1-1.5 hours. During the maintenance process, the vibration of the cemented carbide is also continued;

[0008] Step 3: Allow the cemented carbide to gradually heat up to room temperature under the action of natural recovery. During the heating process, the vibration is no longer applied to the surface of the cemented carbide, and the temperature is maintained at room temperature for 1-1.5 hours. During the temperature maintenance process, the cemented carbide is continuously struck.

[0009] Step 4: Slowly heat the cemented carbide until it reaches 100-200°C. During the heating process, continue to tap the aluminum alloy and gradually reduce the tapping frequency.

[0010] Step 5: Stop tapping the cemented carbide and continue to slowly heat it up until it reaches 400-500°C and maintain it for 1-1.5 hours. Then allow the cemented carbide to cool down to room temperature under natural cooling.

[0011] As a preferred embodiment of the present invention, in step 1, the duration of the process of lowering the temperature of the cemented carbide from room temperature to -100--80°C is not less than 30 minutes, and the duration of the process of heating up to -20-0°C again is not less than 20 minutes.

[0012] As a preferred embodiment of the present invention, the vibration frequency of the cemented carbide in step one is gradually increased from 20 Hz to 30 Hz, and the vibration frequency in step two is maintained at 30 Hz.

[0013] As a preferred embodiment of the present invention, the room temperature in step three and step five is between 20-30°C.

[0014] As a preferred embodiment of the present invention, the frequency of tapping the cemented carbide in step three is 100 times / minute.

[0015] As a preferred embodiment of the present invention, the frequency of tapping the cemented carbide in step 4 is gradually reduced from 100 times / minute to 50 times / minute.

[0016] As a preferred embodiment of the present invention, the vibration in step one and step two acts on the middle position of the cemented carbide surface, and the knocking in step three and step four also acts on the middle position of the cemented carbide surface.

[0017] As a preferred embodiment of the present invention, in step 4, the temperature of the cemented carbide is raised from room temperature to 100-200°C for no less than 10 minutes, and in step 5, the temperature is raised again to 400-500°C for no less than 5 minutes.

[0018] As a preferred embodiment of the present invention, when performing the knocking and vibration operations, the hard aluminum alloy is clamped, the clamping position is located at one-third of the hard aluminum alloy, and the knocking and vibration source is located at the end of the hard aluminum alloy away from the clamping position.

[0019] As a preferred embodiment of the present invention, the hard aluminum alloy is clamped when performing the knocking and vibration operations. In step one and step two, the clamping position is located at one-third of the hard aluminum alloy. In step three and step four, the clamping position is located at one-third of the other side of the hard aluminum alloy. The knocking and vibration source is located at the end of the hard aluminum alloy away from the clamping position.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention eliminates stress on cemented carbide by heating up after cooling, and eliminates stress by vibration during heating up at a low temperature after cooling down. When heating to a slightly higher temperature, the cemented carbide is struck, thereby achieving the purpose of eliminating stress inside the cemented carbide more thoroughly, reducing the interval between cooling and heating up and consuming less energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 The present invention is a stress relief process flow chart of cemented carbide. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] Embodiment 1

[0026] See also Figure 1 The present invention provides a technical solution: a stress relief process for cemented carbide, comprising the following steps:

[0027] Step 1: gradually cool the cemented carbide to be stress-eliminated from room temperature to -100°C. The duration of the process of reducing the cemented carbide from room temperature to -100°C is not less than 30 minutes. At the same time, ensure that the cemented carbide is slowly cooled at a uniform speed. After it is reduced to the target temperature, keep it at this temperature for 1 hour. The purpose is to use the low temperature to eliminate part of the stress in the cemented carbide. Then gradually heat it to -20°C, and the duration of the process of heating it to -20°C again is not less than 20 minutes. Similarly, it is necessary to ensure that the cemented carbide is slowly heated at a uniform speed. In the process of gradually heating it to -20°C, vibrate the cemented carbide at the same time. The initial vibration frequency of the cemented carbide is 20Hz. In the process of gradually heating it to -20°C, the vibration frequency is gradually increased to 30Hz. The frequency increase speed is also kept at a uniform speed. When vibrating, keep the action position of the vibration equipment in the middle of the cemented carbide surface to ensure that the stress of the cemented carbide can be better eliminated.

[0028] Step 2: In order to make the vibration effect eliminate more stress of cemented carbide, the cemented carbide is kept at -20℃ for 1 hour. During the maintenance process, the vibration effect on the cemented carbide is also continued, and the vibration frequency is maintained at 30Hz;

[0029] Step 3: Allow the cemented carbide to gradually heat up to room temperature under the action of natural recovery. The room temperature is between 20-30°C. During the process of heating to room temperature, vibration is no longer applied to the surface of the cemented carbide, and the temperature is maintained at room temperature for 1 hour. During the process of maintaining room temperature, the cemented carbide is continuously tapped at a frequency of 100 times / minute. The tapping position is the middle position of the cemented carbide, or as close to the middle position of the cemented carbide surface as possible, and the slight deformation of the cemented carbide during tapping is used to eliminate stress.

[0030] Step 4: slowly heat up the cemented carbide until it reaches 200°C. The duration of the temperature rise from room temperature to 200°C is not less than 10 minutes. During the heating process, the temperature is kept rising evenly and steadily. During the heating process, the aluminum alloy is continuously tapped to eliminate stress, and the tapping frequency is gradually reduced. The tapping frequency of the cemented carbide is gradually reduced from 100 times / minute to 50 times / minute at a uniform speed.

[0031] Step 5: Stop tapping the cemented carbide to avoid continued tapping that may cause plastic deformation of the cemented carbide and make it unable to recover. Continue to slowly heat it up until it reaches 500°C and maintain it for 1 hour, so that the stress of the cemented carbide can be eliminated as completely as possible. The temperature should be raised to 500°C for no less than 5 minutes. Similarly, keep the temperature of the cemented carbide evenly and steadily rising, and then cool it down to room temperature under natural cooling.

[0032] Embodiment 2

[0033] See also Figure 1 The present invention provides a technical solution: a stress relief process for cemented carbide, comprising the following steps:

[0034] Step 1: gradually cool the cemented carbide to be stress-eliminated from room temperature to -100°C. The duration of the process of reducing the cemented carbide from room temperature to -100°C is not less than 30 minutes. At the same time, ensure that the cemented carbide is slowly cooled at a uniform speed. After it is reduced to the target temperature, keep it at this temperature for 1 hour. The purpose is to use the low temperature to eliminate part of the stress in the cemented carbide. Then gradually heat it to -20°C, and the duration of the process of heating it to -20°C again is not less than 20 minutes. Similarly, it is necessary to ensure that the cemented carbide is slowly heated at a uniform speed. In the process of gradually heating it to -20°C, vibrate the cemented carbide at the same time. The initial vibration frequency of the cemented carbide is 20Hz. In the process of gradually heating it to -20°C, the vibration frequency is gradually increased to 30Hz. The frequency increase speed is also kept at a uniform speed. When vibrating, keep the action position of the vibration equipment in the middle of the cemented carbide surface to ensure that the stress of the cemented carbide can be better eliminated.

[0035] Step 2: In order to make the vibration effect eliminate more stress of cemented carbide, the cemented carbide is kept at -20℃ for 1 hour. During the maintenance process, the vibration effect on the cemented carbide is also continued, and the vibration frequency is maintained at 30Hz;

[0036] Step 3: Allow the cemented carbide to gradually heat up to room temperature under the action of natural recovery. The room temperature is between 20-30°C. During the process of heating to room temperature, vibration is no longer applied to the surface of the cemented carbide, and the temperature is maintained at room temperature for 1 hour. During the process of maintaining room temperature, the cemented carbide is continuously tapped at a frequency of 100 times / minute. The tapping position is the middle position of the cemented carbide, or as close to the middle position of the cemented carbide surface as possible, and the slight deformation of the cemented carbide during tapping is used to eliminate stress.

[0037] Step 4: slowly heat up the cemented carbide until it reaches 150°C. The duration of the temperature rise from room temperature to 150°C is not less than 10 minutes. During the heating process, the temperature is kept rising evenly and steadily. During the heating process, the aluminum alloy is continuously tapped to eliminate stress, and the tapping frequency is gradually reduced. The tapping frequency of the cemented carbide is gradually reduced from 100 times / minute to 50 times / minute at a uniform speed.

[0038] Step 5: Stop tapping the cemented carbide to avoid continued tapping that may cause plastic deformation of the cemented carbide and make it unable to recover. Continue to slowly heat it up until it reaches 450°C and maintain it for 1 hour, so that the stress of the cemented carbide can be eliminated as completely as possible. Heat it up to 450°C again for no less than 5 minutes. Similarly, keep the temperature of the cemented carbide evenly and steadily rising, and then cool it down to room temperature under natural cooling.

[0039] Embodiment 3

[0040] See also Figure 1 The present invention provides a technical solution: a stress relief process for cemented carbide, comprising the following steps:

[0041] Step 1: gradually cool the cemented carbide to be stress-eliminated from room temperature to -90°C. The duration of the process of reducing the cemented carbide from room temperature to -90°C is not less than 40 minutes. At the same time, ensure that the cemented carbide is slowly cooled at a uniform speed. After it is reduced to the target temperature, keep it at this temperature for 1.5 hours. The purpose is to use the low temperature to eliminate part of the stress in the cemented carbide. Then gradually heat it to -10°C, and the duration of the process of heating it to -10°C again is not less than 30 minutes. Similarly, it is necessary to ensure that the cemented carbide is slowly heated at a uniform speed. In the process of gradually heating it to -10°C, vibrate the cemented carbide at the same time. The initial vibration frequency of the cemented carbide is 20Hz, and in the process of gradually heating it to -10°C, the vibration frequency is gradually increased to 30Hz, and the frequency increase speed is also kept at a uniform speed. When vibrating, keep the action position of the vibration equipment in the middle of the cemented carbide surface to ensure that the stress of the cemented carbide can be better eliminated.

[0042] Step 2: In order to make the vibration effect eliminate more stress of cemented carbide, the cemented carbide is kept at -10℃ for 1.5 hours. During the maintenance process, the vibration effect on the cemented carbide is also continued, and the vibration frequency is maintained at 30Hz;

[0043] Step 3: Allow the cemented carbide to gradually heat up to room temperature under the action of natural recovery. The room temperature is between 20-30°C. During the process of heating to room temperature, vibration is no longer applied to the surface of the cemented carbide, and the temperature is maintained at room temperature for 1 hour. During the process of maintaining room temperature, the cemented carbide is continuously tapped at a frequency of 100 times / minute. The tapping position is the middle position of the cemented carbide, or as close to the middle position of the cemented carbide surface as possible, and the slight deformation of the cemented carbide during tapping is used to eliminate stress.

[0044] Step 4: slowly heat up the cemented carbide until it reaches 150°C. The duration of the temperature rise from room temperature to 150°C is not less than 10 minutes. During the heating process, the temperature is kept rising evenly and steadily. During the heating process, the aluminum alloy is continuously tapped to eliminate stress, and the tapping frequency is gradually reduced. The tapping frequency of the cemented carbide is gradually reduced from 100 times / minute to 50 times / minute at a uniform speed.

[0045] Step 5: Stop tapping the cemented carbide to avoid continued tapping that may cause plastic deformation of the cemented carbide and make it unable to recover. Continue to slowly heat it up until it reaches 450°C and maintain it for 1 hour, so that the stress of the cemented carbide can be eliminated as completely as possible. Heat it up to 450°C again for no less than 5 minutes. Similarly, keep the temperature of the cemented carbide evenly and steadily rising, and then cool it down to room temperature under natural cooling.

[0046] Embodiment 4

[0047] See also Figure 1 The present invention provides a technical solution: a stress relief process for cemented carbide, comprising the following steps:

[0048] Step 1: gradually cool the cemented carbide to be stress-eliminated from room temperature to -80°C. The duration of the process of reducing the cemented carbide from room temperature to -80°C is not less than 30 minutes. At the same time, ensure that the cemented carbide is slowly cooled at a uniform speed. After it is reduced to the target temperature, keep it at this temperature for 1.5 hours. The purpose is to use the low temperature to eliminate part of the stress in the cemented carbide. Then gradually heat it to -20°C, and the duration of the process of heating it to -20°C again is not less than 20 minutes. Similarly, it is necessary to ensure that the cemented carbide is slowly heated at a uniform speed. In the process of gradually heating it to -20°C, vibrate the cemented carbide at the same time. The initial vibration frequency of the cemented carbide is 20Hz. In the process of gradually heating it to -20°C, the vibration frequency is gradually increased to 30Hz. The frequency increase speed is also kept at a uniform speed. When vibrating, keep the action position of the vibration equipment in the middle of the cemented carbide surface to ensure that the stress of the cemented carbide can be better eliminated.

[0049] Step 2: In order to make the vibration effect eliminate more stress of cemented carbide, the cemented carbide is kept at -20℃ for 1.5 hours. During the maintenance process, the vibration effect on the cemented carbide is also continued, and the vibration frequency is maintained at 30Hz;

[0050] Step 3: Allow the cemented carbide to gradually heat up to room temperature under the action of natural recovery. The room temperature is between 20-30°C. During the process of heating to room temperature, vibration is no longer applied to the surface of the cemented carbide. The cemented carbide is kept at room temperature for 1.5 hours. During the process of keeping room temperature, the cemented carbide is continuously tapped at a frequency of 100 times / minute. The tapping position is the middle position of the cemented carbide, or as close to the middle position of the cemented carbide surface as possible. The slight deformation of the cemented carbide during tapping is used to eliminate stress.

[0051] Step 4: slowly heat the cemented carbide until it reaches 100°C. The duration of the temperature rise from room temperature to 200°C is not less than 10 minutes. During the heating process, the temperature is kept rising evenly and steadily. During the heating process, the aluminum alloy is continuously tapped to eliminate stress, and the tapping frequency is gradually reduced. The tapping frequency of the cemented carbide is gradually reduced from 100 times / minute to 50 times / minute at a uniform speed.

[0052] Step 5: Stop tapping the cemented carbide to avoid continued tapping that may cause plastic deformation of the cemented carbide and make it unable to recover. Continue to slowly heat it up until it reaches 400°C and maintain it for 1.5 hours to eliminate the stress of the cemented carbide as completely as possible. Heat it up to 400°C for no less than 5 minutes. Similarly, keep the temperature of the cemented carbide evenly and steadily rising. Then cool it down to room temperature under natural cooling.

[0053] Embodiment 5

[0054] See also Figure 1 The present invention provides a technical solution: it is improved based on the second embodiment, including all the contents of step one to step five of the second embodiment.

[0055] The difference from Example 2 is that when implementing steps 1 to 4, the hard aluminum alloy is clamped when knocking and vibrating the hard aluminum alloy, and clamping both ends will make the hard aluminum alloy unable to vibrate well. Therefore, when using a tool to clamp in this embodiment, the clamping position is set to the side of the middle position of the hard aluminum alloy, specifically one-third of one side of the hard aluminum alloy. When knocking or vibrating, the source of action during knocking and the source of action during vibration are located at the end of the hard aluminum alloy box away from the clamping position.

[0056] Embodiment 6

[0057] See also Figure 1 The present invention provides a technical solution: it is improved based on Example 2 and Example 5, and includes all the contents of Step 1 to Step 5 of Example 2.

[0058] The difference from Example 2 and the similarity with Example 5 is that when implementing steps 1 to 4, the hard aluminum alloy is clamped when striking and vibrating the hard aluminum alloy, and clamping both ends will prevent the hard aluminum alloy from vibrating well. Therefore, when using a tool to clamp the hard aluminum alloy, the clamping position of this embodiment is set to the side of the middle position of the hard aluminum alloy, specifically at one-third of one side of the hard aluminum alloy.

[0059] The difference from Example 5 is that, when performing the knocking or vibration in steps one and two, the hard aluminum alloy is clamped at a position of one-third of one side, and then the source of action during the knocking and the source of action during the vibration are located at the end of the hard aluminum box gold away from the clamping position; when performing the knocking or vibration in steps three and four, the clamping position is changed to a position of one-third of the other side of the hard aluminum alloy, and the positions of the knocking and vibration sources are also changed to the other end, so that the source of action during the knocking and the source of action during the vibration are also located at the end of the hard aluminum box gold away from the clamping position, thereby eliminating the stress.

[0060] The traditional method of cemented carbide stress relief data parameter table 1 is as follows:

[0061] Test items Processing time Energy consumption Residual stress Parameters Less than 5h few 10.19％

[0062] Example 1 Cemented carbide stress relief data parameter table 2 is as follows:

[0063] Test items Processing time Energy consumption Residual stress Parameters No less than 7h many 8.23％

[0064] Example 2 Cemented carbide stress relief data parameter table 3 is as follows:

[0065]

[0066]

[0067] Example 3 Cemented carbide stress relief data parameter table 4 is as follows:

[0068] Test items Processing time Energy consumption Residual stress Parameters 5.5-6.5h Moderate 7.75％

[0069] Example 4 Cemented carbide stress relief data parameter table 5 is as follows:

[0070] Test items Processing time Energy consumption Residual stress Parameters No less than 5h less 8.71％

[0071] Example 5 Cemented carbide stress relief data parameter table 6 is as follows:

[0072] Test items Processing time Energy consumption Residual stress Parameters No less than 7h many 7.23％

[0073] Example 6 Cemented carbide stress relief data parameter table 7 is as follows:

[0074] Test items Processing time Energy consumption Residual stress Parameters No less than 7h many 7.07％

[0075] In summary, with reference to the data comparison of Table 1, Table 2, Table 3, Table 4, Table 5, Table 6 and Table 7, it can be obtained that the present invention eliminates stress on cemented carbide by heating up after cooling, and in the process of heating up at a low temperature after cooling, vibration is used to eliminate stress. When the temperature is raised to a slightly higher temperature, the cemented carbide is struck, which can achieve the purpose of more thoroughly eliminating the internal stress of the cemented carbide, and reduce the interval of cooling and heating to consume less energy. When performing Example 6, the residual stress is the least, which is the optimal embodiment.

[0076] 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.

[0077] In addition, it should be understood that although the present specification is described according to 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A stress relief process for cemented carbide, It is characterized in that The following steps are involved: Step 1: gradually cool the cemented carbide to be stress-relieved from room temperature to -100--80°C, keep it for 1-1.5 hours, and then gradually heat it up to -20-0°C. During the process of gradually heating up to -20-0°C, vibrate the cemented carbide at the same time. During the process of heating up to -20-0°C, the vibration frequency gradually increases; Step 2: Keep the cemented carbide at -20-0℃ for 1-1.5 hours. During the maintenance process, the vibration of the cemented carbide is also continued; Step 3: Allow the cemented carbide to gradually heat up to room temperature under the action of natural recovery. During the heating process, the vibration is no longer applied to the surface of the cemented carbide, and the temperature is maintained at room temperature for 1-1.5 hours. During the temperature maintenance process, the cemented carbide is continuously struck. Step 4: Slowly heat the cemented carbide until it reaches 100-200°C. During the heating process, continue to tap the aluminum alloy and gradually reduce the tapping frequency. Step 5: Stop tapping the cemented carbide and continue to slowly heat it up until it reaches 400-500°C and maintain it for 1-1.5 hours. Then allow the cemented carbide to cool down to room temperature under natural cooling.

2. The stress relief process of cemented carbide according to claim 1, Features: In the step 1, the duration of the process of lowering the temperature of the cemented carbide from room temperature to -100--80°C is not less than 30 minutes, and the duration of the process of heating up to -20-0°C again is not less than 20 minutes.

3. The stress relief process of cemented carbide according to claim 1, Features: In the step 1, the vibration frequency of the cemented carbide is gradually increased from 20 Hz to 30 Hz, and the vibration frequency in the step 2 is maintained at 30 Hz.

4. The stress relief process of cemented carbide according to claim 1, Features: The room temperature in step 3 and step 5 is between 20-30°C.

5. The stress relief process of cemented carbide according to claim 1, Features: The frequency of tapping the cemented carbide in step 3 is 100 times / minute.

6. The stress relief process of cemented carbide according to claim 1, Features: In the step 4, the frequency of tapping the cemented carbide is gradually reduced from 100 times / minute to 50 times / minute.

7. The stress relief process of cemented carbide according to claim 1, Features: The vibration in step 1 and step 2 acts on the middle position of the cemented carbide surface, and the knocking in step 3 and step 4 also acts on the middle position of the cemented carbide surface.

8. The stress relief process of cemented carbide according to claim 1, Features: In the step 4, the duration of heating the cemented carbide from room temperature to 100-200° C. is not less than 10 minutes, and the duration of heating the cemented carbide again to 400-500° C. in the step 5 is not less than 5 minutes.

9. The stress relief process of cemented carbide according to claim 1, Features: When performing the knocking and vibration operations, the hard aluminum alloy is clamped, the clamping position is located at one-third of the hard aluminum alloy, and the knocking and vibration source is located at the end of the hard aluminum alloy away from the clamping position.

10. The stress relief process of cemented carbide according to claim 1, Features: When performing the knocking and vibration operations, the hard aluminum alloy is clamped. In steps one and two, the clamping position is located at one-third of the hard aluminum alloy. In steps three and four, the clamping position is located at one-third of the other side of the hard aluminum alloy, and the knocking and vibration source is located at the end of the hard aluminum alloy away from the clamping position.

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