Grinding equipment and machining method based on mold surface after nanocrystallization nitriding

Abstract

The invention discloses grinding equipment based on mold surface nanocrystallization nitriding and a machining method, and relates to the technical field of grinding. The grinding equipment comprises a base, the base is slidably connected with a lifting table, the base is fixedly connected with a fixing frame, the base is fixedly connected with an air cylinder, the telescopic end of the air cylinder is fixedly connected with the lifting table, and the telescopic end of the air cylinder is fixedly connected with the fixing frame; the fixing frame is movably connected with a bearing frame, the fixing frame is fixedly connected with an infrared sensor, and the infrared sensor downwards faces the table top of the lifting table. The temperature change during grinding is detected through the infrared sensor, the control system automatically adjusts the length of the telescopic rod of the air cylinder according to the temperature, so that the pressure between the grinding frame and a workpiece is dynamically adjusted, the higher the temperature is, the lower the grinding pressure is, temperature reduction is accelerated, meanwhile, workpiece deformation or damage caused by high temperature is prevented, and the working efficiency is improved. The grinding quality is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of grinding, and in particular to grinding equipment and a processing method based on nano-nitriding of a mold surface. Background Art

[0002] Nitriding treatment of the mold surface is a common surface modification technology. Through nitriding treatment, a high-hardness nitride layer can be formed on the mold surface, which significantly improves the surface hardness and prevents the intrusion of oxygen and moisture. This makes the mold have higher hardness, wear resistance and corrosion resistance, which can significantly extend the service life of the mold and improve product quality.

[0003] However, in practical applications, these high-hardness surfaces often need to be finely ground to achieve the ideal finish and flatness to ensure their performance in precision machining. For example, the heat generated by grinding needs to be cooled by appropriate coolant. Otherwise, too high a temperature will damage the nitride layer on the workpiece surface, causing thermal deformation or damage to the mold, affecting the quality of the final product; while too low a temperature may lead to waste of coolant and increase production costs. For example, the grinding pressure needs to be appropriate, otherwise, when the temperature is low, low-pressure grinding will affect the grinding effect, and when the temperature is high, high-pressure grinding will easily cause damage or deformation to the workpiece surface.

[0004] Since it is difficult to make the coolant flow and grinding pressure dynamically adapt to the grinding temperature at the same time with the current grinding technology, a grinding device and a processing method based on nano-nitriding of the mold surface are proposed. Summary of the invention

[0005] In order to overcome the disadvantage of the previous grinding technology that it is difficult to make the coolant flow and the grinding pressure dynamically adapt to the grinding temperature at the same time, the present invention provides a grinding device and a processing method based on nano-nitriding of the mold surface.

[0006] The grinding equipment based on the nano-nitriding of the mold surface includes a base, the base is slidably connected to a lifting platform, the base is fixedly connected to a fixed frame, the base is fixedly connected to a cylinder, the telescopic end of the cylinder is fixedly connected to the lifting platform, the fixed frame is movably connected to a bearing frame, the fixed frame is fixedly connected to an infrared sensor, the infrared sensor is downwardly facing the table top of the lifting platform, the bearing frame is fixedly connected to a connecting pipe, the bearing frame is rotatably connected to a hollow shaft, the connecting pipe is rotatably connected to the hollow shaft, a grinding frame is slidably connected in the hollow shaft, the grinding frame is located above the lifting platform, and coolant channels are opened in the hollow shaft and the grinding frame, and the The coolant channel of the hollow shaft is connected with the connecting pipe, a first spring is fixedly connected between the hollow shaft and the grinding frame, at least one Y-shaped hole is opened on the side of the grinding frame close to the coolant channel of the hollow shaft, the Y-shaped hole is located in the coolant channel of the grinding frame, and the Y-shaped hole moves upward and extends into the coolant channel of the hollow shaft. At this time, the coolant channel of the grinding frame is connected with the coolant channel of the hollow shaft through the Y-shaped hole, a fixing ring is fixedly connected on the side of the coolant channel of the hollow shaft close to the Y-shaped hole, and the fixing ring is used to block the Y-shaped hole, and the supporting frame is provided with a driving component for driving the grinding frame to rotate and grind.

[0007] As a preferred technical solution of the present invention, the infrared sensor is electrically connected to the cylinder through a control module.

[0008] As a preferred technical solution of the present invention, the driving assembly includes a first motor, the first motor is fixedly connected to the supporting frame, the output shaft of the first motor is transmission-connected to the hollow shaft via a pulley assembly, the connecting pipe is fixedly connected with a contact switch, and the contact switch is electrically connected to the first motor via a control module.

[0009] As a preferred technical solution of the present invention, it also includes a cooling pipe, which is connected to the connecting pipe, and the cooling pipe is wound several times along the outer wall of the first motor. The supporting frame is fixedly connected to the connecting frame, and the cooling pipe is fixedly connected to the connecting frame. The connecting frame is rotatably connected to a retaining ring, and the retaining ring is fixedly connected to the grinding frame through circumferentially distributed blades.

[0010] As a preferred technical solution of the present invention, it also includes two fixed cylinders, the fixed cylinders are connected to the connecting pipe, an adjustment frame is slidably connected between the two fixed cylinders, the adjustment frame moves to contact the contact switch, the adjustment frame is slidably connected to the connecting pipe, a second spring is fixed between the fixed cylinder and the adjustment frame, and a strip-shaped adjustment port is opened on the side of the adjustment frame close to the cooling pipe.

[0011] As a preferred technical solution of the present invention, it also includes a second motor, which is fixedly connected to the fixed frame, the contact switch is electrically connected to the second motor through a control module, and the output shaft of the second motor is fixedly connected to a crank, which is rotatably connected to the supporting frame.

[0012] As a preferred technical solution of the present invention, the rotation speed of the second motor is lower than the rotation speed of the first motor.

[0013] As a preferred technical solution of the present invention, it also includes a rotating ring, which is rotatably connected to the lifting platform, the base has two guide grooves, the rotating ring is slidably connected to the guide grooves, the top of the rotating ring is slidably connected to a circumferentially distributed clamping block, the rotating ring has circumferentially distributed arc grooves, the arc grooves correspond to the clamping blocks one by one, and the rotating ring pushes the clamping blocks to slide along the lifting platform through the arc grooves.

[0014] As a preferred technical solution of the present invention, the upper portion of the guide groove is configured as a straight groove, and the lower portion is configured as a curved groove.

[0015] The grinding method based on the mold surface after nano-nitriding includes the following steps: S1: placing the mold workpiece to be polished on the lifting platform directly below the polishing frame; S2: Control the telescopic rod of the cylinder to extend upward until the grinding frame drives the Y-shaped hole to move upward until the V-port on the upper half is completely blocked by the fixing ring, leaving only the I-port on the half to communicate with the coolant channel of the hollow shaft; S3: starting the first motor and the second motor; S4: Turn off the first motor and the second motor, and control the telescopic rod of the cylinder to shorten and reset downward.

[0016] Beneficial effects: 1. The present invention detects temperature changes during grinding through infrared sensors, and the control system automatically adjusts the length of the cylinder telescopic rod according to the temperature, thereby dynamically adjusting the pressure between the grinding frame and the workpiece, so that the higher the temperature, the lighter the grinding pressure, thereby accelerating the temperature reduction, while preventing deformation or damage of the workpiece caused by high temperature, and ensuring the grinding quality.

[0017] 2. The present invention can also adjust the diameter of the Y-shaped hole communicating with the cooling channel through the temperature control system, so that the coolant flow rate can be adjusted in real time according to the temperature, so that the higher the temperature, the greater the coolant flow rate, which effectively controls the temperature rise during the grinding process and avoids damage to the workpiece and equipment due to overheating.

[0018] 3. The present invention realizes basic grinding by driving the grinding frame to rotate by the first motor, and at the same time drives the crank to rotate by the second motor, so that the grinding frame reciprocates along an irregular trajectory to realize fancy grinding, expand the grinding range, and improve the grinding uniformity and efficiency.

[0019] 4. The coolant of the present invention not only directly acts on the inner periphery of the grinding frame, but also cools down the outer wall of the first motor through the cooling pipe, thereby further protecting key components; at the same time, the coolant is dispersed on the outer periphery of the grinding frame, expanding the cooling range and enhancing the overall cooling effect.

[0020] 5. When the coolant channel is blocked, the regulating port of the present invention will automatically expand adaptively to reduce the coolant pressure, thereby playing a role of real-time pressure relief protection, avoiding overpressure caused by the blockage of the coolant channel, and when the coolant channel is blocked too much and the contact switch is triggered, the system will immediately turn off the first motor and the second motor, stop grinding, and realize the emergency shutdown function to prevent equipment failure or safety accidents.

[0021] 6. During the lifting process, the lifting platform of the present invention is guided by the guide groove to make the rotating ring rotate clockwise, and the clamping block moves to the middle to clamp the workpiece; during the lowering process, it rotates counterclockwise to release the workpiece, which simplifies the clamping and unloading process of the workpiece and shortens the non-processing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] Figure 2 It is a partial three-dimensional structural cross-sectional view of the present invention.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the supporting frame, crank, first motor and other components of the present invention.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the connecting pipe, hollow shaft, grinding frame and other components of the present invention.

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the hollow shaft, the grinding frame and the fixing ring of the present invention.

[0027] Figure 6 It is a three-dimensional structural schematic diagram of the connecting pipe, cooling pipe, retaining ring and other components of the present invention.

[0028] Figure 7 It is a three-dimensional structural schematic diagram of components such as the cooling pipe, the adjustment frame and the contact switch of the present invention.

[0029] Figure 8 It is a three-dimensional structural schematic diagram of the fixing cylinder, the contact switch, the second spring and other components of the present invention.

[0030] Fig. 9 It is a three-dimensional structural schematic diagram of the lifting platform, rotating ring, clamping block and other components of the present invention.

[0031] Fig.10 This is a three-dimensional structural separation diagram of the base and the rotating ring of the present invention.

[0032] Wherein: 101-base, 102-lifting platform, 103-fixed frame, 104-cylinder, 105-carrying frame, 106-infrared sensor, 107-first motor, 108-pulley assembly, 109-connecting pipe, 110-hollow shaft, 111-grinding frame, 112-first spring, 113-Y-shaped hole, 114-fixed ring, 115-contact switch, 201-cooling pipe, 202-blocking ring, 203-connecting frame, 301-fixed cylinder, 302-adjusting frame, 303-second spring, 304-adjusting port, 401-second motor, 402-crank, 501-rotating ring, 502-guide groove, 503-clamping block. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0034] Example 1: Grinding equipment based on the surface of the mold after nano-nitriding, such as Figure 1-Figure 5As shown, it includes a base 101, a lifting platform 102 is slidably connected to the middle of the base 101 along the up-down direction, a fixing frame 103 is fixedly connected to the right side of the base 101, a cylinder 104 is fixedly connected to the front side of the base 101, the telescopic end of the cylinder 104 is fixedly connected to the lifting platform 102, a bearing frame 105 is movably connected to the upper part of the fixing frame 103, an infrared sensor 106 is fixedly connected to the middle of the fixing frame 103, and the infrared sensor 106 faces downward to the table surface of the lifting platform 102, The infrared sensor 106 is electrically connected to the cylinder 104 through the control module. The first motor 107 is fixedly connected to the right side of the carrier 105. A connecting pipe 109 is fixedly connected to the top middle of the carrier 105. The connecting pipe 109 is used to input coolant. A hollow shaft 110 is rotatably connected to the middle of the carrier 105. The connecting pipe 109 is rotatably connected to the hollow shaft 110. The output shaft of the first motor 107 is connected to the hollow shaft 110 through a pulley assembly 108. A grinding frame 111 is slidably connected in the shaft 110 in the up-down direction. The grinding frame 111 is located above the lifting platform 102. Coolant channels are provided in both the hollow shaft 110 and the grinding frame 111. The upper side of the cooling channel of the hollow shaft 110 is connected to the connecting pipe 109. A first spring 112 is fixedly connected between the hollow shaft 110 and the grinding frame 111. Two Y-shaped holes 113 are provided on the upper side of the grinding frame 111. The Y-shaped holes 113 are located in the cooling channel of the grinding frame 111. The Y-shaped hole 113 moves upward and extends into the coolant channel of the hollow shaft 110. At this time, the coolant channel of the grinding frame 111 is connected with the coolant channel of the hollow shaft 110 through the Y-shaped hole 113. A fixing ring 114 is fixedly connected to the lower side of the coolant channel of the hollow shaft 110. The fixing ring 114 is used to block the Y-shaped hole 113 after moving upward. A contact switch 115 is fixedly connected to the upper part of the connecting tube 109. The contact switch 115 is electrically connected to the first motor 107 through the control module.

[0035] First, place the mold workpiece to be polished on the lifting platform 102 directly below the polishing frame 111, then manually control the telescopic rod of the cylinder 104 to extend upward, thereby driving the lifting platform 102 to move upward, and the lifting platform 102 drives the workpiece to move upward, and the workpiece contacts the bottom of the polishing frame 111 and continues to squeeze the polishing frame 111, so that the polishing frame 111 slides upward relative to the hollow shaft 110, and the first spring 112 is compressed until the polishing frame 111 drives the Y-shaped hole 113 to move upward until the V-mouth in the upper half is completely blocked by the fixing ring 114, leaving only the I-mouth in the half connected to the coolant channel of the hollow shaft 110, and then start the first motor 107, and the output shaft of the first motor 107 The hollow shaft 110 is driven to rotate relative to the carrier 105 through the pulley assembly 108, thereby driving the grinding frame 111, the first spring 112 and the fixing ring 114 to rotate as a whole, so that the grinding frame 111 performs compression-type self-rotation grinding on the top of the workpiece. After the grinding is completed, the contact switch 115 is manually touched to turn off the first motor 107, and the telescopic rod of the cylinder 104 is controlled to shorten downward, thereby driving the lifting platform 102 to move downward, so that the polished mold workpiece is separated from the grinding frame 111, and the first spring 112 is reset to drive the grinding frame 111 to slide downward relative to the hollow shaft 110 until the grinding frame 111 drives the Y-shaped hole 113 to move downward until it is completely blocked by the hollow shaft 110.

[0036] During the above-mentioned grinding process, the high-speed friction between the grinding frame 111 and the workpiece will cause temperature rise. The higher the temperature, the stronger the infrared radiation. The coolant can be input into the connecting pipe 109 so that the coolant flows into the cooling channel of the hollow shaft 110, and then flows into the coolant channel of the grinding frame 111 through the I port of the Y-shaped hole 113, and finally flows along the inner periphery of the grinding frame 111 to the workpiece, achieving the effect of grinding and cooling at the same time. When the infrared sensor 106 detects that the infrared radiation intensity reaches the minimum preset value, the infrared sensor 106 sends an electrical signal, and the control module receives the electrical signal, and controls the telescopic rod of the cylinder 104 to adaptively contract according to the intensity of the infrared radiation (the stronger the infrared radiation, the more it contracts), thereby reducing the adaptability of the lifting platform 102, and then reducing the adaptability of the workpiece, and then causing the first spring 112 to adaptively rebound, so that the grinding frame 111 As the workpiece descends, the grinding frame 111 drives the V-mouth of the Y-shaped hole 113 to adaptively move downward out of the fixing ring 114, so that the coolant flowing from the hollow shaft 110 into the grinding frame 111 is adaptively increased. When the temperature gradually decreases, the control module controls the telescopic rod of the cylinder 104 to adaptively extend according to the intensity of the infrared radiation, so that the coolant flowing from the hollow shaft 110 into the grinding frame 111 is adaptively decreased. In this way, the higher the grinding temperature, the more coolant is added, so that the amount of coolant added automatically and dynamically matches the grinding temperature, effectively controlling the temperature rise during the grinding process, avoiding damage to the workpiece and equipment caused by overheating, and achieving the effect that the higher the temperature, the lighter the grinding pressure, so that the grinding pressure automatically and dynamically matches the grinding temperature, thereby accelerating the temperature reduction, while preventing deformation or damage to the workpiece caused by high temperature, and ensuring the grinding quality.

[0037] Embodiment 2: Based on embodiment 1, Figure 6 As shown, it also includes a cooling pipe 201, which is connected to the right side of the connecting pipe 109. The cooling pipe 201 is wrapped four times along the outer wall of the first motor 107. A connecting frame 203 is fixedly connected to the bottom of the supporting frame 105. The cooling pipe 201 is fixedly connected to the connecting frame 203. The lower part of the connecting frame 203 is rotatably connected to a retaining ring 202, and the retaining ring 202 is fixedly connected to the grinding frame 111 through circumferentially distributed blades.

[0038] Most of the coolant in the input connecting pipe 109 enters the coolant channel of the hollow shaft 110, and a small part can be depressurized and diverted into the cooling pipe 201. The cooling pipe 201 is wound along the outer wall of the first motor 107, so that the coolant can cool down and dissipate the heat of the first motor 107 with a higher rotation speed. At the same time, the coolant flowing out through the cooling pipe 201 will flow to the blades in the retaining ring 202. Since the outlet end of the cooling pipe 201 and the supporting frame 105 are fixedly connected by the connecting frame 203, the retaining ring 202 is directly fixedly connected to the grinding frame 111, and the grinding frame 111 rotates relative to the supporting frame 105, so that the blades in the retaining ring 202 rotate relative to the outlet end of the cooling pipe 201, so that the coolant flowing out from the outlet end of the cooling pipe 201 is scattered on the periphery of the grinding frame 111, thereby expanding the range of the coolant, achieving better cooling effect and wider coverage.

[0039] Embodiment 3: Based on embodiment 2, Figure 7 and Figure 8 As shown, it also includes two fixed cylinders 301, which are connected to the connecting tube 109, and an adjustment frame 302 is slidably connected between the two fixed cylinders 301 along the up and down directions. The adjustment frame 302 moves upward to contact the contact switch 115, and the adjustment frame 302 is slidably connected to the connecting tube 109. A second spring 303 is fixed between the fixed cylinder 301 and the adjustment frame 302, and a strip-shaped adjustment port 304 is opened on the side of the adjustment frame 302 close to the cooling tube 201.

[0040] When the coolant channel is blocked, the regulating port 304 can be enlarged to allow more coolant to flow into the cooling pipe 201, thereby reducing the coolant pressure on the blocked coolant channel. The specific operation is as follows: according to the blockage situation, the hydraulic pressure of the coolant in the connecting pipe 109 will be adaptively increased, so that the regulating frame 302 will adaptively move upward, and the second spring 303 will adaptively compress, so that the diameter of the regulating port 304 communicating with the cooling pipe 201 will be adaptively enlarged. In this way, the amount of coolant entering the cooling pipe 201 automatically and dynamically matches the blockage degree of the coolant channel, thereby achieving the effect of real-time pressure relief for overpressure protection, thereby avoiding overpressure caused by blockage of the coolant channel.

[0041] When the coolant channel is blocked too much, the adjustment frame 302 triggers the contact switch 115 upward, and the contact switch 115 controls the first motor 107 to be turned off through the control module, thereby stopping the grinding and realizing the emergency shutdown function to prevent equipment failure or safety accidents.

[0042] Embodiment 4: Based on embodiment 3, Figure 1-Figure 3As shown, it also includes a second motor 401, which is fixedly connected to the top of the fixed frame 103. The contact switch 115 is electrically connected to the second motor 401 through the control module. The rotation speed of the second motor 401 is lower than the rotation speed of the first motor 107. The output shaft of the second motor 401 is fixedly connected to a crank 402, and the crank 402 is rotatably connected to the top of the support frame 105.

[0043] During grinding, the second motor 401 can also be started so that the output shaft of the second motor 401 drives the crank 402 thereon to rotate, and the two cranks 402 jointly drive the carrier frame 105 to reciprocate according to an irregular trajectory, thereby driving the first motor 107, the pulley assembly 108, the connecting pipe 109, the hollow shaft 110, the grinding frame 111, the first spring 112 and the fixing ring 114 thereon to rotate synchronously as a whole, thereby realizing fancy grinding, expanding the operating range of the grinding frame 111, thereby expanding the grinding range and improving the grinding effect; if the adjustment frame 302 triggers the contact switch 115 upward, the contact switch 115 controls the second motor 401 to be turned off through the control module; if the adjustment frame 302 does not trigger the contact switch 115 upward, the second motor 401 is manually turned off.

[0044] like Fig. 9 and Fig.10 As shown, it also includes a rotating ring 501, which is rotatably connected to the lifting platform 102. Two guide grooves 502 are opened on the base 101. The upper part of the guide groove 502 is set as a straight groove, and the lower part is set as a curved groove. The rotating ring 501 is slidably connected to the guide groove 502. The top of the rotating ring 501 is slidably connected with four circumferentially distributed clamping blocks 503. The clamping blocks 503 are used to clamp the workpiece. The rotating ring 501 has four circumferentially distributed arc grooves, which correspond to the clamping blocks 503 one by one, and the rotating ring 501 pushes the clamping blocks 503 to slide along the lifting platform 102 through the arc grooves.

[0045] When the lifting platform 102 is lifted upward, the rotating ring 501 and the clamping block 503 are driven to rise together. During this process, the rotating ring 501 will also rotate clockwise under the guidance of the guide groove 502. The rotating ring 501 pushes the clamping block 503 to move toward the middle through the arc groove thereon to clamp the workpiece. At the later stage of the lifting platform 102 falling downward, the lifting platform 102 pushes the rotating ring 501 to rotate counterclockwise and reset through the lower part of the guide groove, so that the clamping block 503 is reset to release the workpiece.

[0046] Embodiment 5: Based on Embodiment 4, a grinding method based on the surface of the mold after nano-nitriding comprises the following steps: S1: placing the mold workpiece to be polished on the lifting platform 102 directly below the polishing frame 111; S2: Control the telescopic rod of the cylinder 104 to extend upward until the grinding frame 111 drives the Y-shaped hole 113 to move upward until the V-shaped opening in the upper half is completely blocked by the fixing ring 114, leaving only the I-shaped opening in the half to communicate with the coolant channel of the hollow shaft 110; S3: Start the first motor 107 and the second motor 401; S4: Turn off the first motor 107 and the second motor 401, and control the telescopic rod of the cylinder 104 to shorten and reset downward.

[0047] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. The grinding equipment based on the nano-nitriding of the mold surface is characterized by: The invention comprises a base (101), wherein the base (101) is slidably connected to a lifting platform (102), wherein the base (101) is fixedly connected to a fixing frame (103), wherein the base (101) is fixedly connected to a cylinder (104), wherein the telescopic end of the cylinder (104) is fixedly connected to the lifting platform (102), wherein a bearing frame (105) is movably connected to the fixing frame (103), wherein the fixing frame (103) is fixedly connected to an infrared sensor (106), wherein the infrared sensor (106) is downwardly movable. The support frame (105) is fixedly connected with a connecting pipe (109) facing the table surface of the lifting platform (102), the support frame (105) is rotatably connected with a hollow shaft (110), the connecting pipe (109) is rotatably connected with the hollow shaft (110), a grinding frame (111) is slidably connected inside the hollow shaft (110), the grinding frame (111) is located above the lifting platform (102), and a cooling liquid channel is provided inside the hollow shaft (110) and the grinding frame (111). The cooling liquid channel of the hollow shaft (110) is connected to the connecting pipe (109), a first spring (112) is fixedly connected between the hollow shaft (110) and the grinding frame (111), at least one Y-shaped hole (113) is formed on a side of the grinding frame (111) close to the cooling liquid channel of the hollow shaft (110), the Y-shaped hole (113) is located in the cooling liquid channel of the grinding frame (111), and the Y-shaped hole (113) moves upward and extends into the hollow shaft (1 10), at this time, the coolant channel of the grinding frame (111) is connected to the coolant channel of the hollow shaft (110) through the Y-shaped hole (113), and a fixing ring (114) is fixedly connected to the coolant channel of the hollow shaft (110) on one side close to the Y-shaped hole (113), and the fixing ring (114) is used to block the Y-shaped hole (113), and the supporting frame (105) is provided with a driving component for driving the grinding frame (111) to rotate and grind.

2. The grinding equipment based on the mold surface after nano-nitriding according to claim 1, characterized in that: The infrared sensor (106) is electrically connected to the cylinder (104) via a control module.

3. The grinding equipment based on the mold surface after nano-nitriding according to claim 2, characterized in that: The driving assembly comprises a first motor (107), the first motor (107) is fixedly connected to the carrier frame (105), the output shaft of the first motor (107) is transmission-connected to the hollow shaft (110) via a pulley assembly (108), the connecting pipe (109) is fixedly connected to a contact switch (115), and the contact switch (115) is electrically connected to the first motor (107) via a control module.

4. The grinding equipment based on the mold surface after nano-nitriding according to claim 3, characterized in that: It also includes a cooling pipe (201), the cooling pipe (201) being connected to the connecting pipe (109), the cooling pipe (201) being wound along the outer wall of the first motor (107) for a plurality of turns, the supporting frame (105) being fixedly connected to a connecting frame (203), the cooling pipe (201) being fixedly connected to the connecting frame (203), the connecting frame (203) being rotatably connected to a retaining ring (202), and the retaining ring (202) being fixedly connected to the grinding frame (111) via circumferentially distributed blades.

5. The grinding equipment based on the mold surface after nano-nitriding according to claim 4, characterized in that: The invention also includes two fixed cylinders (301), the fixed cylinders (301) being in communication with the connecting tube (109), an adjusting frame (302) being slidably connected between the two fixed cylinders (301), the adjusting frame (302) moving to contact the contact switch (115), the adjusting frame (302) being slidably connected to the connecting tube (109), a second spring (303) being fixedly connected between the fixed cylinders (301) and the adjusting frame (302), and a strip-shaped adjusting port (304) being provided on a side of the adjusting frame (302) close to the cooling tube (201).

6. The grinding equipment based on nano-nitriding of the mold surface according to claim 5, characterized in that: The device also includes a second motor (401), the second motor (401) being fixedly connected to the fixing frame (103), the contact switch (115) being electrically connected to the second motor (401) via a control module, the output shaft of the second motor (401) being fixedly connected to a crank (402), and the crank (402) being rotationally connected to the supporting frame (105).

7. The grinding equipment based on the mold surface after nano-nitriding according to claim 6, characterized in that: The rotation speed of the second motor (401) is lower than the rotation speed of the first motor (107).

8. The grinding equipment based on the mold surface after nano-nitriding according to claim 7, characterized in that: The invention also comprises a rotating ring (501), wherein the rotating ring (501) is rotatably connected to the lifting platform (102), the base (101) is provided with two guide grooves (502), the rotating ring (501) is slidably connected to the guide grooves (502), the top of the rotating ring (501) is slidably connected to a circumferentially distributed clamping block (503), the rotating ring (501) is provided with circumferentially distributed arc grooves, the arc grooves correspond to the clamping blocks (503) one by one, and the rotating ring (501) pushes the clamping block (503) to slide along the lifting platform (102) through the arc grooves.

9. The grinding equipment based on the mold surface after nano-nitriding according to claim 8, characterized in that: The upper portion of the guide groove (502) is configured as a straight groove, and the lower portion is configured as a curved groove.

10. A method for grinding a mold surface after nano-nitriding, applied to a grinding device for grinding a mold surface after nano-nitriding according to any one of claims 1 to 9, comprising the following steps: S1: placing the mold workpiece to be polished on the lifting platform (102) directly below the polishing frame (111); S2: Controlling the telescopic rod of the cylinder (104) to extend upward until the grinding frame (111) drives the Y-shaped hole (113) to move upward until the V-shaped opening of the upper half is completely blocked by the fixing ring (114), leaving only the I-shaped opening of the half to communicate with the coolant channel of the hollow shaft (110); S3: starting the first motor (107) and the second motor (401); S4: shutting down the first motor (107) and the second motor (401), and controlling the telescopic rod of the cylinder (104) to shorten and reset downward.

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