Die processing machine

Abstract

The invention relates to the technical field of mold processing, in particular to a mold processing machine which comprises an outer frame, multiple sets of supporting columns are fixedly installed at the bottom end of the outer frame, a sealing cover is movably installed at an opening in the top end of the outer frame, the mold processing machine further comprises a feeding pipe, the feeding pipe is fixedly installed at the top end of the sealing cover, and the bottom end of the feeding pipe penetrates through the sealing cover. The feeding pipe is arranged in the outer frame and communicated with the interior of the outer frame, the feeding pipe is used for adding a nitrogen-containing and carbon-containing salt mixture containing silicon carbide particles into the outer frame, and the heating mechanism is arranged in the outer frame and used for heating the interior of the outer frame. According to the surface nitriding device, the to-be-machined mold can be subjected to grinding and heat treatment at the same time, surface nitriding operation can be immediately conducted on the to-be-machined mold after the grinding and heat treatment operation is completed, and the three operations can supplement one another and promote one another while the three operations are conducted; therefore, the efficiency and the quality of mold processing are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of mold processing, and in particular to a mold processing machine. Background Art

[0002] Moulds play a vital role in industrial production. They are various molds and tools used to obtain the required products by methods such as injection molding, blow molding, extrusion, die-casting or forging, smelting, and stamping. In short, moulds are tools used to make moulded objects. This tool is composed of various parts, and different moulds are composed of different parts. It mainly realizes the processing of the shape of the object by changing the physical state of the moulded material. It is known as the "mother of industry".

[0003] In the process of mold processing, grinding, heat treatment and surface nitriding are required to improve mold performance, optimize mold processing quality, and enhance the comprehensive performance of the mold to adapt to complex working conditions. However, in the existing mold processing process, the three operations of grinding, heat treatment and surface nitriding are performed separately, and grinding, heat treatment and surface nitriding separately require a lot of time and energy, which greatly reduces the efficiency of mold processing. Moreover, since each operation is independent of each other, if the three operations are simply combined together, each operation cannot promote each other, thereby failing to effectively improve the efficiency of mold processing, and having poor practicality. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art that the three operations of grinding, heat treatment and surface nitriding of the mold separately require a lot of time and energy, and the three operations have no promoting effect on each other, thereby greatly reducing the efficiency of mold processing, and to propose a mold processing machine.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A mold processing machine comprises an outer frame, a plurality of support columns are fixedly mounted on the bottom of the outer frame, and a sealing cover is movably mounted on the top opening of the outer frame, and further comprises:

[0007] A feeding pipe, the feeding pipe is fixedly mounted on the top of the sealing cover, and the bottom of the feeding pipe passes through the sealing cover and is connected to the inside of the outer frame, and the feeding pipe is used to add a nitrogen-containing and carbon-containing salt mixture containing silicon carbide particles into the inside of the outer frame;

[0008] A heating mechanism, the heating mechanism is arranged inside the outer frame and is used to heat the inside of the outer frame;

[0009] A vibrator, which is mounted at the bottom of the outer frame and is used to make the inside of the outer frame vibrate at a high frequency;

[0010] A mold to be processed and a clamping and rotating mechanism, wherein the mold to be processed is arranged on the clamping and rotating mechanism, and the clamping and rotating mechanism is arranged inside the outer frame and is used to clamp and fix the mold to be processed and rotate the clamped and fixed mold to be processed;

[0011] The gas supply mechanism is arranged at the bottom end of the outer frame and is used to transport gas to the inside of the outer frame to assist in the surface nitriding of the mold to be processed.

[0012] Preferably, the heating mechanism comprises a plurality of groups of heating plates, and the plurality of groups of heating plates are evenly mounted on the inner wall of the outer frame.

[0013] Preferably, the clamping and rotating mechanism includes a hydraulic push rod, a driving motor and a plug-in assembly, the hydraulic push rod and the driving assembly are respectively installed at two ends of the outer frame, the output end of the hydraulic push rod passes through the outer wall of the outer frame and is installed with a bearing, and the output end of the hydraulic push rod is rotatably connected to the plug-in assembly through the bearing, the output end of the driving motor is fixedly connected with a connecting shaft, the end of the connecting shaft away from the driving motor passes through the outer wall of the outer frame and is fixedly connected to the plug-in assembly, and the bearing and the connecting shaft are connected to the two ends of the mold to be processed through the plug-in assembly.

[0014] Preferably, the plug-in assembly includes two groups of fixed plates, wherein one group of the fixed plates is fixedly connected to the connecting shaft at one end away from the mold to be processed, and the other group of the fixed plates is rotatably connected to the bearing at one end away from the mold to be processed, and multiple groups of plug rods are fixedly installed on the opposite ends of the two groups of fixed plates, and multiple groups of fixing grooves corresponding to the multiple groups of plug rods are provided at both ends of the mold to be processed, and the multiple groups of plug rods on the two groups of fixed plates are respectively plugged into the multiple groups of fixing grooves at both ends of the mold to be processed.

[0015] Preferably, the drive motor is a permanent magnet synchronous motor.

[0016] Preferably, the air supply mechanism comprises two groups of air guide pipes, both groups of air guide pipes are installed at the bottom end of the outer frame, and the outer frame is fixedly connected to the first air storage tank and the second air storage tank through the two groups of air guide pipes.

[0017] Preferably, carbon dioxide and nitrogen are placed in the first gas storage tank and the second gas storage tank respectively.

[0018] Preferably, both groups of the air guide pipes are equipped with one-way valves to prevent the gas and liquid in the outer frame from flowing back.

[0019] Preferably, a sensor is installed on the outer frame for detecting the temperature and pressure inside the outer frame in real time.

[0020] Preferably, the vibrator is an electromagnetic vibrator.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] 1. The present invention uses a vibrator, a heating mechanism and a clamping and rotating mechanism to cooperate with each other, and uses a feeding pipe to add a nitrogen- and carbon-containing salt mixture containing silicon carbide particles to the inside of the outer frame, so that the mold to be processed can be polished and heat-treated at the same time, and the surface of the mold to be processed can be nitrided immediately after the polishing and heat treatment operations are completed. While performing these three operations, the three operations can also complement and promote each other, thereby greatly improving the efficiency and quality of mold processing.

[0023] 2. The present invention, through the arrangement of a heating plate and a clamping and rotating mechanism, can heat the inside of the outer frame while allowing the mold to be processed to rotate in the salt containing silicon carbide particles. Compared with traditional air heating or some other heating methods, salt-wrapped heating can make the entire mold reach the required heat treatment temperature more quickly, reducing the internal stress difference caused by uneven temperature. The processing mold wrapped in salt can not only prevent its surface oxidation, but also reduce the contamination of the surface of the mold to be processed by other impurities. In addition, the mold to be processed rotating in the outer frame will produce relative movement with the nitrogen- and carbon-containing salt mixture containing silicon carbide particles to polish the surface of the processing mold. For some mold materials with higher hardness or surface defects that are difficult to remove, silicon carbide particles have a better polishing effect, thereby significantly improving the heat treatment and polishing quality of the mold to be processed, thereby improving the quality of mold processing.

[0024] 3. The present invention, through the setting of the vibrator, can make the inner part of the outer frame vibrate at high frequency when the inner part of the outer frame is heated and the mold to be processed rotates in the mixed salt. The high-frequency vibration can cause the mixed salt and the silicon carbide particles therein to be strongly disturbed and accelerated. The silicon carbide particles will obtain greater kinetic energy in this dynamic environment, thereby increasing the impact force and grinding force on the surface of the mold to be processed, so that the stubborn impurities, oxides and uneven parts on the surface of the mold can be removed more efficiently. The vibration can make the mixed salt and silicon carbide particles form a more uniform flow field around the mold to be processed, so as to achieve a more uniform polishing effect, thereby further improving the polishing effect.

[0025] 4. The present invention provides a heating plate and an air supply mechanism, and increases the temperature of the heating plate to melt the nitrogen- and carbon-containing salts, so that the mold to be processed can be immediately subjected to salt bath nitriding after polishing and heat treatment. The air supply mechanism can be used to fill carbon dioxide and nitrogen from the bottom of the outer frame. Filling gas from the bottom can produce a flow from bottom to top, like a fountain effect, forming a strong stirring effect on the salt bath liquid, so that the various components in the salt bath can be more evenly distributed, thereby improving the nitriding effect. In addition, the nitrogen filled from the bottom can form a more stable nitrogen concentration gradient on the mold surface, so that nitrogen atoms can orderly penetrate into the mold material, reduce the pores and defects in the nitrided layer, and further improve the nitriding effect. The addition of gas increases the internal pressure of the outer frame, which helps to increase the activity and collision frequency of gas molecules, thereby promoting the carbonitriding process and improving the nitriding efficiency.

[0026] 5. The present invention utilizes the mutual cooperation of the vibrator and the air supply mechanism to utilize the high-frequency vibration inside the outer frame to cause the microscopic flow and stirring effect of the molten salt, thereby accelerating the diffusion rate of nitrogen atoms, so that more nitrogen atoms can reach the surface of the mold to be processed faster and penetrate into the interior of the mold material to be processed, thereby promoting the nitriding reaction. This can shorten the salt bath nitriding time, further improve the nitriding efficiency, and thus improve the mold processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall axial structure of a mold processing machine proposed by the present invention.

[0028] Figure 2 This is a schematic diagram of the overall bottom structure of a mold processing machine proposed by the present invention.

[0029] Figure 3 This is a schematic diagram of the heating plate and feeding pipe structure of a mold processing machine proposed by the present invention.

[0030] Figure 4 This is a schematic diagram of the driving motor and connecting shaft structure of a mold processing machine proposed by the present invention.

[0031] Figure 5 This is a schematic diagram of the mold and fixing groove structure of a mold processing machine proposed by the present invention.

[0032] Figure 6 This is a schematic diagram of a half-section structure of an outer frame and a heating plate of a mold processing machine proposed by the present invention.

[0033] In the figure, 1 is an outer frame, 2 is a sealing cover, 3 is a feeding pipe, 4 is a supporting column, 5 is a sensor, 6 is a heating plate, 7 is a vibrator, 8 is a first gas storage tank, 9 is a second gas storage tank, 10 is an air guide pipe, 11 is a one-way valve, 12 is a driving motor, 13 is a connecting shaft, 14 is a mold to be processed, 15 is a fixing groove, 16 is a hydraulic push rod, 17 is a fixing plate, and 18 is a bearing. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference Figures 1 to 6 A mold processing machine comprises an outer frame 1, a plurality of support columns 4 are fixedly installed at the bottom of the outer frame 1, and a sealing cover 2 is movably installed at the top opening of the outer frame 1, a feeding pipe 3 is installed at the top of the sealing cover 2, and is used to add a nitrogen-containing and carbon-containing salt mixture containing silicon carbide particles into the inner part of the outer frame 1, the bottom end of the feeding pipe 3 passes through the sealing cover 2 and is connected with the inner part of the outer frame 1, a sensor 5 is installed on the outer frame 1, and the temperature and pressure inside the outer frame 1 can be detected in real time through the sensor 5, and a heating mechanism is arranged inside the outer frame 1 for heating the outer frame 1 1 is heated inside, the heating mechanism includes a plurality of heating plates 6, the plurality of heating plates 6 are evenly mounted on the inner wall of the outer frame 1, a clamping and rotating mechanism is arranged inside the outer frame 1, a mold 14 to be processed is arranged on the clamping and rotating mechanism, the clamping and rotating mechanism is used to clamp and fix the mold 14 to be processed and rotate the mold 14 to be processed after clamping and fixing, the clamping and rotating mechanism includes a hydraulic push rod 16, a drive motor 12 and a plug-in assembly, the hydraulic push rod 16 and the drive assembly are respectively mounted at both ends of the outer frame 1, and the hydraulic push rod 16 outputs The end passes through the outer wall of the outer frame 1 and is installed with a bearing 18, and the output end of the hydraulic push rod 16 is rotatably connected to the plug-in assembly through the bearing 18. The output end of the drive motor 12 is fixedly connected with a connecting shaft 13. The end of the connecting shaft 13 away from the drive motor 12 passes through the outer wall of the outer frame 1 and is fixedly connected to the plug-in assembly. The bearing 18 and the connecting shaft 13 are connected to the two ends of the mold 14 to be processed through the plug-in assembly. The drive motor 12 is a permanent magnet synchronous motor. The permanent magnet synchronous motor has higher efficiency and power factor. Compared with other types of motors, the energy consumption of the permanent magnet synchronous motor is lower under the same output power. This can significantly reduce the operating cost for the long-term salt bath nitriding and polishing process. The permanent magnet synchronous motor has the characteristics of stable speed and can maintain a constant rotation speed without being affected by load changes. This is very important for processes that require precise control of the mold surface treatment effect to ensure that each part can be evenly polished and nitrided. In addition, the permanent magnet synchronous motor is small in size, light in weight, and occupies little space, which is convenient for installation and layout in the mold processing machinery.

[0036] Reference Figures 4 to 6 The plug-in assembly includes two sets of fixed plates 17, one end of which is away from the mold to be processed 14 and is fixedly connected to the connecting shaft 13, and the other end of which is away from the mold to be processed 14 and is rotatably connected to the bearing 18. The two sets of fixed plates 17 are fixedly installed with multiple sets of plug rods at the opposite ends, and multiple sets of fixed grooves 15 corresponding to the multiple sets of plug rods are opened at both ends of the mold to be processed 14. The multiple sets of plug rods on the two sets of fixed plates 17 are respectively plugged into the multiple sets of fixed grooves 15 at both ends of the mold to be processed 14. By connecting the connecting shaft 13 and the hydraulic push rod 1 6. The fixing plate 17 at the output end is inserted into the fixing grooves 15 on both sides of the mold 14 to be processed for preliminary fixation, and then the hydraulic push rod 16 is adjusted to firmly fix the mold 14 to be processed, and then the nozzle of the feeding pipe 3 is opened to add the nitrogen-containing and carbon-containing salt mixture containing silicon carbide particles into the outer frame 1 until the salt mixture completely submerges the mold 14 to be processed. By starting the heating plate 6 and the driving motor 12, the inner part of the outer frame 1 can be heated while the mold 14 to be processed can be rotated in the salt containing silicon carbide particles.

[0037] Reference Figure 2 and Figure 6A vibrator 7 is installed at the bottom of the outer frame 1. The vibrator 7 is an electromagnetic vibrator. The electromagnetic vibrator can change the vibration intensity by adjusting the current size and frequency, so as to meet the needs of different process stages and mold types. For example, in the initial grinding stage, the rough part of the mold surface can be quickly removed by increasing the vibration intensity. In addition, during the nitriding process, the vibration intensity can be appropriately reduced to ensure the quality stability of the nitriding layer. The electromagnetic vibrator can quickly respond to changes in current and realize instant start and stop, which is convenient for accurately controlling the time and rhythm of vibration, so that the vibration state can be adjusted in real time according to different process steps, so as to better process the mold; when the mold 14 to be processed is in the medium containing silicon carbide particles, When rotating in the salt, the vibrator 7 at the bottom can be started to make the inner part of the outer frame 1 vibrate at a high frequency, and the mold 14 to be processed is rotated in the salt containing silicon carbide particles while the inner part of the outer frame 1 is heated. The inner part of the outer frame 1 is vibrated at a high frequency, which has the following advantages: First, the melting point of the mixed salt is about 570°C. The temperature inside the outer frame 1 is detected by the sensor 5. The inner temperature of the outer frame 1 is kept at about 500°C to perform annealing heat treatment on the mold 14 to be processed. Since the mold 14 to be processed is wrapped in salt, the salt has good fluidity and thermal conductivity after heating. When the mold is buried in the salt, the salt can fully wrap each surface of the mold, and at the same time, the heat can be evenly transferred to every part of the mold, which is different from the traditional Compared with air heating or some other heating methods, salt wrapping heating can make the entire mold reach the required heat treatment temperature more quickly, reducing the internal stress difference caused by uneven temperature; second, being wrapped in salt can not only prevent oxidation, but also reduce the contamination of other impurities on the surface of the mold 14 to be processed; third, silicon carbide particles are added to the interior of the mixed salt. Combined with the physical properties of the mixed salt itself, the mold 14 to be processed rotating in the salt will produce relative motion with the salt and silicon carbide particles. The salt and silicon carbide particles will produce a certain friction on the surface of the mold 14 to be processed. This friction can play a grinding role, and can remove some bumps, burrs or uneven parts of the surface of the mold 14 to be processed to a certain extent. For some mold materials with higher hardness or surface defects that are difficult to remove, silicon carbide particles have a better grinding effect, so that they can better assist the salt in grinding the surface of the mold to be processed 14. At the same time, some grease substances contaminated during the processing process may be dissolved or loosened under the action of high-temperature salt, and carried away with the rotation of the mold to be processed 14 and the flow of salt; Fourth, high-frequency vibration can cause strong disturbance and acceleration of the mixed salt and the silicon carbide particles therein. In this dynamic environment, the silicon carbide particles will obtain greater kinetic energy, thereby increasing the impact force and grinding force on the surface of the mold to be processed 14, which helps to more efficiently remove stubborn impurities, oxides and uneven parts on the mold surface, and improve the efficiency and quality of grinding;5. Vibration can make the mixed salt and silicon carbide particles form a more uniform flow field around the mold 14 to be processed, reduce dead angles and local unevenness during the grinding process, and all parts of the surface of the mold 14 to be processed can be more fully exposed to the abrasive, thereby achieving a more uniform grinding effect. ;

[0038] Reference Figure 2 , Figure 3 and Figure 6The outer frame 1 is provided with an air supply mechanism at the bottom end thereof, which is used for conveying gas to the inner part of the outer frame 1 to assist the surface nitriding of the mold 14 to be processed, and the air supply mechanism comprises two sets of air guide pipes 10, both of which are installed at the bottom end of the outer frame 1, and the outer frame 1 is respectively fixedly connected with a first gas storage tank 8 and a second gas storage tank 9 through the two sets of air guide pipes 10, wherein carbon dioxide and nitrogen are respectively placed in the first gas storage tank 8 and the second gas storage tank 9, and a one-way valve 11 is installed on both sets of air guide pipes 10, and the setting of the one-way valve 11 can prevent the gas and liquid in the outer frame 1 from flowing back; after the grinding and heat treatment are completed, Continue to increase the temperature of the heating plate 6 to melt the salt mixture in the outer frame 1, thereby performing salt bath nitriding. At the same time, open the first gas storage tank 8, the second gas storage tank 9 and the one-way valve 11, and respectively fill in carbon dioxide and nitrogen from the bottom through the air guide pipe 10. This has the following advantages: First, during carbonitriding in the salt bath nitriding, carbon dioxide will undergo a reduction reaction, increasing the carbon content in the salt solution, thereby increasing the carbon potential. Since carbon dioxide is a relatively easy to obtain and common industrial waste gas, passing it into the salt solution for carbonitriding can realize the reuse of carbon dioxide, reducing the second The emission of carbon dioxide reduces the negative impact on the atmospheric environment. At the same time, since the nitrogen used in the process is abundant in the atmosphere and no by-products harmful to the environment are usually produced during the reaction, it can avoid pollution to the atmospheric environment. Second, the gas filled from the bottom can produce a bottom-up flow, like a fountain effect, which forms a strong stirring effect on the salt bath liquid. This stirring effect helps to make the various components in the salt bath, such as nitrides, carbon sources and other additives, more evenly distributed, thereby improving the nitriding effect. Third, uniform gas distribution and good stirring effect help A denser and more uniform nitriding layer is formed. The nitrogen filled from the bottom can form a more stable nitrogen concentration gradient on the mold surface, so that nitrogen atoms can penetrate into the mold material in an orderly manner, reducing the pores and defects in the nitriding layer; Fourth, the addition of gas increases the pressure, which helps to increase the activity and collision frequency of gas molecules. Nitrogen and carbon elements can also participate in the reaction and diffusion more actively under the action of pressure, promote the carbonitriding process, and the internal pressure of the outer frame 1 can be detected in real time through the sensor 5 to avoid excessive pressure; Fifth, vibration can cause the microscopic flow and stirring effect of the molten salt, thereby accelerating the diffusion rate of nitrogen atoms. More nitrogen atoms can reach the surface of the mold 14 to be processed faster and penetrate into the material of the mold 14 to be processed, promoting the nitriding reaction, which can shorten the time of salt bath nitriding, thereby improving the mold processing efficiency.

[0039] In the present invention, the mold processing process needs to be polished, heat treated and surface nitrided, so as to improve the mold performance, optimize the mold processing quality, and enhance the comprehensive performance of the mold to adapt to complex working conditions. However, polishing, heat treating and surface nitriding separately require a lot of time and energy, and there is no promotion effect between each other. The specific design of this device, combined with a new set of process flow, can perform polishing and heat treatment operations on the mold at the same time, and after completing the polishing and heat treatment operations, the mold can be immediately subjected to surface nitriding operations, which greatly improves the processing efficiency and improves the processing quality.

[0040] Open the sealing cover 2, start the hydraulic push rod 16 to retract it, insert the connecting shaft 13 and the fixing plate 17 of the output end of the hydraulic push rod 16 into the fixing grooves 15 on both sides of the mold 14 to be processed for preliminary fixation, adjust the hydraulic push rod 16 to firmly fix the mold 14 to be processed, open the pipe mouth of the feeding pipe 3, and add a nitrogen- and carbon-containing salt mixture containing silicon carbide particles into the outer frame 1 to completely submerge the mold 14 to be processed.

[0041] Start the heating plate 6 and the drive motor 12, and heat the inside while rotating the mold 14 to be processed in the salt containing silicon carbide particles. The drive motor 12 is a permanent magnet synchronous motor, which has high efficiency and power factor. Compared with other types of motors, the permanent magnet synchronous motor has lower energy consumption at the same output power, which can significantly reduce the operating cost for long-term salt bath nitriding and polishing processes. The permanent magnet synchronous motor has the characteristics of stable speed and can maintain a constant rotation speed without being affected by load changes. This is very important for processes that require precise control of the mold surface treatment effect, ensuring that each part can be evenly polished and nitrided. In addition, the permanent magnet synchronous motor is small in size, light in weight, and occupies little space, which is easy to install and layout in the mold processing machine. The front end fixing plate 17 of the hydraulic push rod 16 is connected It is connected by a bearing 18 and can cooperate with the rotation of the mold 14 to be processed. When the mold 14 to be processed rotates in the salt containing silicon carbide particles, the vibrator 7 at the bottom is started to make the inside of the outer frame 1 vibrate at high frequency. The vibrator 7 is an electromagnetic vibrator. The electromagnetic vibrator can change the vibration intensity by adjusting the current size and frequency, so as to meet the needs of different process stages and mold types. For example, in the initial polishing stage, the rough part of the mold surface can be quickly removed by increasing the vibration intensity. In addition, in the nitriding process, the vibration intensity can be appropriately reduced to ensure the stable quality of the nitriding layer, and the electromagnetic vibrator can respond quickly to changes in current and realize instant start and stop, which is convenient for precise control of the vibration time and rhythm, so that the vibration state can be adjusted in real time according to different process steps, so that the mold can be better processed.

[0042] While heating the inside of the outer frame 1, the mold 14 to be processed is rotated in the salt containing silicon carbide particles, and the inner part of the outer frame 1 is vibrated at high frequency, which has the following advantages: 1. The melting point of the mixed salt is about 570°C. The temperature inside the outer frame 1 is detected by the sensor 5. The temperature inside the outer frame 1 is kept at about 500°C to perform annealing heat treatment on the mold 14 to be processed. Since the mold 14 to be processed is wrapped in salt, the salt has good fluidity and thermal conductivity after heating. When the mold is buried in the salt, the salt can fully wrap all surfaces of the mold, and at the same time, the heat can be evenly transferred to every part of the mold. Compared with traditional air heating or some other heating methods, salt wrapping heating can make the entire mold reach the required heat treatment temperature more quickly, reducing the internal stress differences caused by uneven temperature; second, being wrapped in salt can not only prevent oxidation, but also reduce the contamination of other impurities on the surface of the mold 14 to be processed; third, silicon carbide particles are added to the interior of the mixed salt. Combined with the physical properties of the mixed salt itself, the mold 14 to be processed rotating in the salt will produce relative movement between the salt and silicon carbide particles, and the salt and silicon carbide particles will produce a certain friction on the surface of the mold 14 to be processed. This friction can play a grinding role, and can remove some bumps, burrs or uneven parts of the surface of the mold 14 to be processed to a certain extent. For some mold materials with higher hardness or surface defects that are difficult to remove, silicon carbide particles have a better grinding effect, so that they can better assist the salt in grinding the surface of the mold 14 to be processed. At the same time, some grease substances contaminated during the processing process may be dissolved or loosened under the action of high-temperature salt, and carried away with the rotation of the mold 14 to be processed and the flow of salt; Fourth, high-frequency vibration can cause strong disturbance and acceleration of the mixed salt and the silicon carbide particles therein. Silicon carbide particles will obtain greater kinetic energy in this dynamic environment, thereby increasing the impact force and grinding force on the surface of the mold 14 to be processed. This helps to more efficiently remove stubborn impurities, oxides and uneven parts on the mold surface, and improve the efficiency and quality of grinding; Fifth, vibration can make the mixed salt and silicon carbide particles form a more uniform flow field around the mold 14 to be processed, reducing dead angles and local unevenness during grinding. Each part of the surface of the mold 14 to be processed can be more fully contacted with the abrasive, thereby achieving a more uniform grinding effect.

[0043] Since the mold 14 to be processed is wrapped in salt for heat treatment at this time, the heat treatment process can effectively reduce the residual stress inside the mold 14 to be processed. Polishing under a low residual stress state can obtain a smoother surface. For subsequent nitriding, a good stress state can ensure the bonding strength and stability of the nitrided layer.

[0044] The grinding in this process can remove the oxide scale, rust and other minor defects on the surface of the mold 14 to be processed, so as to improve the surface finish. In this way, when the nitriding treatment is carried out later, it is conducive to the nitriding reaction, thereby forming a nitriding layer with better quality.

[0045] After the grinding and heat treatment are completed, the temperature of the heating plate 6 is increased to melt the salts for salt bath nitriding. At the same time, the first gas storage tank 8, the second gas storage tank 9 and the one-way valve 11 are opened, and carbon dioxide and nitrogen are respectively filled from the bottom through the air guide pipe 10. This has the following advantages: First, when carbonitriding is performed in the salt bath nitriding, carbon dioxide will undergo a reduction reaction, increasing the carbon content in the salt solution, thereby increasing the carbon potential. Since carbon dioxide is a relatively easy to obtain and common industrial waste gas, it is passed into the salt solution for carbonitriding process, which can realize the reuse of carbon dioxide, reduce carbon dioxide emissions, and reduce the negative impact on the atmospheric environment. At the same time, since the nitrogen used in the process is abundant in the atmosphere and usually no by-products harmful to the environment are produced during the reaction process, it can avoid pollution to the atmospheric environment; Second, filling the gas from the bottom can produce a bottom-up flow, like a fountain effect, forming a strong stirring effect on the salt bath liquid. This stirring effect helps to make the various components in the salt bath, such as nitrides, carbon sources and other additives, more evenly distributed, and improve the nitriding effect; third, uniform gas distribution and good stirring effect help to form a denser and more uniform nitriding layer. The nitrogen filled from the bottom can form a more stable nitrogen concentration gradient on the mold surface, so that nitrogen atoms can penetrate into the mold material in an orderly manner, reducing the pores and defects in the nitriding layer; fourth, the addition of gas increases the pressure, which helps to increase the activity and collision frequency of gas molecules. Nitrogen and carbon elements can also participate in the reaction and diffusion more actively under the action of pressure, promote the carbonitriding process, and the internal pressure of the outer frame 1 can be detected in real time through the sensor 5 to avoid excessive pressure; fifth, vibration can cause the microscopic flow and stirring effect of the molten salt, thereby accelerating the diffusion rate of nitrogen atoms. More nitrogen atoms can reach the surface of the mold 14 to be processed faster and penetrate into the material of the mold 14 to be processed, promoting the nitriding reaction, which can shorten the salt bath nitriding time, thereby improving the mold processing efficiency.

[0046] After the processing is completed, the mold 14 to be processed is taken out and allowed to cool naturally to obtain a mold after strengthening processing.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mold processing machine, comprising an outer frame (1), wherein a plurality of support columns (4) are fixedly mounted on the bottom end of the outer frame (1), and a sealing cover (2) is movably mounted on the top opening of the outer frame (1), characterized in that: Also includes: A feeding pipe (3), wherein the feeding pipe (3) is fixedly mounted on the top of the sealing cover (2), and the bottom end of the feeding pipe (3) passes through the sealing cover (2) and is connected to the inside of the outer frame (1), and the feeding pipe (3) is used to add a nitrogen-containing and carbon-containing salt mixture containing silicon carbide particles into the inside of the outer frame (1); A heating mechanism, the heating mechanism being arranged inside the outer frame (1) and being used for heating the inside of the outer frame (1); A vibrator (7), the vibrator (7) being mounted at the bottom end of the outer frame (1) and used to make the interior of the outer frame (1) vibrate at a high frequency; A mold to be processed (14) and a clamping and rotating mechanism, wherein the mold to be processed (14) is arranged on the clamping and rotating mechanism, and the clamping and rotating mechanism is arranged inside the outer frame (1) and is used to clamp and fix the mold to be processed (14) and to rotate the mold to be processed (14) after clamping and fixing; A gas supply mechanism is arranged at the bottom end of the outer frame (1) and is used to transport gas to the inside of the outer frame (1) to assist in the surface nitriding of the mold (14) to be processed.

2. A mold processing machine according to claim 1, characterized in that: The heating mechanism comprises a plurality of groups of heating plates (6), and the plurality of groups of heating plates (6) are evenly mounted on the inner wall of the outer frame (1).

3. A mold processing machine according to claim 1, characterized in that: The clamping and rotating mechanism comprises a hydraulic push rod (16), a driving motor (12) and a plug-in assembly. The hydraulic push rod (16) and the driving assembly are respectively mounted at two ends of the outer frame (1). The output end of the hydraulic push rod (16) passes through the outer wall of the outer frame (1) and is mounted with a bearing (18). The output end of the hydraulic push rod (16) is rotatably connected to the plug-in assembly via the bearing (18). The output end of the driving motor (12) is fixedly connected to a connecting shaft (13). The end of the connecting shaft (13) away from the driving motor (12) passes through the outer wall of the outer frame (1) and is fixedly connected to the plug-in assembly. The bearing (18) and the connecting shaft (13) are both connected to two ends of a mold (14) to be processed via the plug-in assembly.

4. A mold processing machine according to claim 3, characterized in that: The plug-in assembly comprises two groups of fixed plates (17), wherein one end of the fixed plates (17) of one group is fixedly connected to the connecting shaft (13) at a distance from the mold (14) to be processed, and the other end of the fixed plates (17) of the other group is rotatably connected to the bearing (18) at a distance from the mold (14) to be processed. Multiple groups of plug rods are fixedly mounted on opposite ends of the two groups of fixed plates (17), and multiple groups of fixed grooves (15) corresponding to the multiple groups of plug rods are provided at both ends of the mold (14) to be processed. The multiple groups of plug rods on the two groups of fixed plates (17) are respectively plugged into the multiple groups of fixed grooves (15) at both ends of the mold (14) to be processed.

5. A mold processing machine according to claim 3, characterized in that: The drive motor (12) is a permanent magnet synchronous motor.

6. The mold processing machine according to claim 1, characterized in that: The air supply mechanism comprises two groups of air guide pipes (10), the two groups of air guide pipes (10) are both installed at the bottom end of the outer frame (1), and the outer frame (1) is respectively fixedly connected to a first air storage tank (8) and a second air storage tank (9) through the two groups of air guide pipes (10).

7. A mold processing machine according to claim 6, characterized in that: Carbon dioxide and nitrogen are respectively placed in the first gas storage tank (8) and the second gas storage tank (9).

8. The mold processing machine according to claim 6, characterized in that: Both groups of air guide pipes (10) are equipped with one-way valves (11) for preventing the gas and liquid in the outer frame (1) from flowing back.

9. The mold processing machine according to claim 1, characterized in that: The outer frame (1) is provided with a sensor (5) for detecting the temperature and pressure inside the outer frame (1) in real time.

10. The mold processing machine according to claim 1, characterized in that: The vibrator (7) is an electromagnetic vibrator.

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