Vacuum oil quenching heat treatment device and treatment method for tool

Abstract

The present application relates to a vacuum oil quenching heat treatment device and method for cutting tools, which are applied in the technical field of cutting tool processing. The device comprises a vacuum furnace body, a material frame for holding cutting tools placed in the heating chamber of the vacuum furnace body, an oil tank provided in the cooling chamber of the vacuum furnace body, a static filter, an outer frame, a lifting mechanism, a transfer mechanism for transporting the material box from the heating chamber to the static filter, a cleaning mechanism for removing oxide scale from the quenching oil, and a collecting mechanism for collecting oxide scale, wherein the transfer mechanism is provided in the cooling chamber; a frame is provided in the cooling chamber, an oil tank is provided on the frame, a lifting mechanism is provided in the oil tank and is used to drive the outer frame to lift and lower, a static filter is provided on the outer frame, a cleaning mechanism is provided on the outer frame and is located below the static filter; one end of the collecting mechanism is connected to the bottom of the oil tank, and the other end of the collecting mechanism is connected to the side wall of the oil tank. The present application has the effect of extending the service life of quenching oil and improving the quenching quality of cutting tools.

Description

Technical Field

[0001] The present application relates to the technical field of tool processing, and in particular to a vacuum oil quenching heat treatment device and a treatment method for a tool. Background Art

[0002] Quenching can significantly improve a material's rigidity, hardness, wear resistance, and fatigue strength, thereby meeting the diverse requirements of various mechanical parts and tools. Vacuum quenching of cutting tools involves quenching and cooling the tool within a vacuum furnace. The quenching medium is primarily inert gas, water, and vacuum quenching oil. Oil quenching involves heating the tool in a heating chamber, then moving it to a cooling chamber filled with high-purity nitrogen and immediately transferring it to a quenching oil tank for rapid cooling.

[0003] The Chinese patent with announcement number CN103725843B discloses a monitored operation vacuum furnace, which includes a furnace body shell, in which a cooling chamber and a heating chamber are arranged, and the cooling chamber and the heating chamber are separated by a partition wall, and the partition wall is provided with a partition wall inlet and outlet, and the partition wall inlet and outlet are installed with an insulating door, which is opened and closed by an insulating door lifting mechanism; a heating chamber platform is provided in the heating chamber, and a material frame is placed on the heating chamber platform. At the same time, a number of heating tubes are evenly arranged along the circumference of the heating chamber, and a heating chamber furnace door is provided on the side opposite to the cooling chamber; the cooling chamber is provided with an air quenching chamber and an oil quenching chamber from top to bottom, the upper part of the air quenching chamber is provided with an air charging rapid cooling mechanism, the lower part of the oil quenching chamber is provided with an oil quenching oil tank, and the cooling chamber furnace door is provided on the side opposite to the heating chamber; a material frame transfer mechanism is provided inside the cooling chamber, and a vacuum pumping mechanism is provided outside the cooling chamber and the heating chamber.

[0004] Regarding the aforementioned related technologies, the inventors believe that the scale produced during the quenching process on cutting tools remains in the quenching oil. Manual cleaning of this scale is cumbersome and typically occurs only once every few months. However, the scale acts as an adsorbent and readily absorbs additives in the quenching oil, accelerating the deterioration of the quenching oil's performance and shortening its service life. Summary of the Invention

[0005] In order to improve the problem that the oxide scale of the tool remains in the quenching oil for a long time, thereby shortening the life of the quenching oil, the present application provides a vacuum oil quenching heat treatment device and a treatment method for the tool.

[0006] In a first aspect, the present application provides a vacuum oil quenching heat treatment device for a tool, which adopts the following technical solution:

[0007] A vacuum oil quenching heat treatment device for cutting tools comprises a vacuum furnace body, a material frame for holding cutting tools placed in a heating chamber of the vacuum furnace body, an oil tank provided in a cooling chamber of the vacuum furnace body, a static filter, an outer frame, a lifting mechanism, a transfer mechanism for transferring the material box from the heating chamber to the static filter, a cleaning mechanism for removing oxide scale from quenching oil, and a collecting mechanism for collecting oxide scale, wherein the transfer mechanism is provided in the cooling chamber;

[0008] A frame is provided in the cooling chamber, the oil tank is provided on the frame, the lifting mechanism is provided in the oil tank and is used to drive the outer frame to rise and fall, the static filter is provided on the outer frame, and the debris cleaning mechanism is provided on the outer frame and is located below the static filter;

[0009] One end of the debris collecting mechanism is communicated with the bottom of the oil tank, and the other end of the debris collecting mechanism is communicated with the side wall of the oil tank.

[0010] With this technical solution, after the tool is heated, the feed frame is moved to the static filter via a transfer mechanism. The lifting mechanism is then activated to lower the static filter. The feed frame and tool then descend synchronously with the static filter under the action of gravity and are immersed in the quenching oil to quench the tool. After quenching is complete, the lifting mechanism is activated to raise the feed frame above the quenching oil level. The feed frame and quenched tool are then manually removed for the next step.

[0011] The larger oxide scale that falls off the tool is retained on the static filter. After the material frame and the tool are taken out, the larger oxide scale is manually removed from the static filter with the help of tools, thereby reducing the amount of oxide scale in the quenching oil.

[0012] Smaller scales that fall off the tool pass through the static filter and the cleaning mechanism. Once the larger scales have been removed, the cleaning mechanism is activated to block the static filter, reducing the filter holes. The lifting mechanism is then activated to drive the outer frame down, causing the static filter and cleaning mechanism to descend, trapping the smaller scales on the cleaning mechanism and transferring them to the collection mechanism for collection. This can further reduce the amount of scale in the quenching oil, slowing down the deterioration of the quenching oil's performance and extending its service life. At the same time, improved quenching oil performance can also improve the quenching quality of the tool.

[0013] Optionally, the debris cleaning mechanism includes an inner frame, a dynamic filter provided on the inner frame, a limit assembly, and a driving assembly for driving the inner frame to translate; a cavity is provided in the outer frame, and the inner frame is slidably provided on the outer frame;

[0014] The inner frame is located between the driving assembly and the limiting assembly, and both the driving assembly and the limiting assembly are arranged in the cavity, and the inner frame is tightly pressed against the limiting assembly.

[0015] By adopting this technical solution, in the initial state, the filter holes of the dynamic filter and the static filter are arranged to overlap one by one. When the outer frame is lowered, the quenching oil can more smoothly pass through the dynamic and static filters to cool the tool. When cleaning smaller amounts of scale, the limit assembly is activated to release the limit on the inner frame, and the drive assembly drives the inner frame to move until the filter holes of the dynamic filter partially overlap with the filter mesh of the static filter, thereby improving filtration accuracy. The lifting mechanism is activated to drive the outer frame downward, and the dynamic and static filters descend, carrying the smaller amounts of scale to the bottom of the oil tank, where they are collected by the debris collection mechanism.

[0016] Optionally, the driving assembly includes a connecting plate and a plurality of springs provided on the connecting plate, the springs are provided on the cavity wall of the cavity, and the inner frame is provided on the connecting plate.

[0017] By adopting the above technical solution, the inner frame can be driven to press against the limiting assembly under the elastic force of the spring.

[0018] Optionally, the limiting assembly includes a rotating rod, a cam provided on the rotating rod and a micro motor for driving the rotating rod to rotate. A sealing frame is provided in the cavity, and the sealing frame and the cavity wall form a sealed cavity. The micro motor is provided in the sealed cavity, and the end of the rotating rod away from the micro motor is rotatably connected to the cavity wall, and the inner frame is pressed against the cam.

[0019] By adopting this technical solution, in the initial state, the end of the cam farther from the rotating rod abuts the inner frame. When cleaning smaller oxide scale, the micromotor drives the rotating rod to rotate, releasing the cam from abutting the inner frame. Simultaneously, the inner frame, driven by the spring, abuts against the sealing frame, allowing the filter holes of the dynamic filter to partially overlap with the filter mesh of the static filter, thereby improving filtration accuracy and cleaning smaller oxide scale.

[0020] Optionally, the lifting mechanism includes a screw and a lifting motor for driving the screw to rotate, a support plate is provided on the inner wall of the cooling chamber, the lifting motor is provided on the support plate, and one end of the screw away from the lifting motor is rotatably connected to the bottom of the oil tank;

[0021] The outer frame is threadedly connected to the screw rod, and the outer peripheral wall of the outer frame is in contact with the inner wall of the oil groove.

[0022] By adopting the above technical solution, since the outer frame is threadedly connected to the screw and the outer peripheral wall of the outer frame fits the inner wall of the oil groove, when the screw is driven to rotate by the driving motor, the outer frame can be driven to rise or fall along the screw.

[0023] Optionally, the transfer mechanism includes a translation cylinder, a first lifting cylinder, a connecting plate provided at the driving end of the translation cylinder, a connecting rod provided at the driving end of the first lifting cylinder, and a pair of lifting rods provided on the connecting rod. The translation cylinder is provided on the inner wall of the cooling chamber, the first lifting cylinder is provided on the connecting plate, and the material frame is provided with a pair of insertion tubes for the lifting rods to penetrate.

[0024] By adopting the above technical solution, the translation cylinder can drive the lifting rod to move away from or close to the material frame, and the first lifting cylinder can drive the lifting rod to rise or fall. By cooperating with the translation cylinder and the first lifting cylinder, the material frame can be moved from the heating chamber to the static filter.

[0025] Optionally, the bottom of the oil tank is connected to a discharge pipe, the discharge pipe is provided with a valve, the debris collection mechanism includes a debris storage box, a filter plate and an oil return assembly, the debris storage box is provided on the frame and connected to the discharge pipe;

[0026] The filter plate is provided with a plurality of filter holes, and the filter plate is tiltedly arranged in the storage box. One end of the oil return assembly is connected to the bottom of the storage box, and the other end of the oil return assembly is connected to the side wall of the oil tank.

[0027] With this technical solution, once the dynamic and static filters descend, driving the scale to the bottom of the oil tank, the valve opens, allowing the scale and quenching oil at the bottom of the tank to flow into the sump. After being filtered by the filter plates, the scale is retained on them, while the quenching oil flows to the bottom of the sump and is then fed back to the oil tank via the oil return assembly to cool the tool. This also improves work efficiency compared to manual oil removal.

[0028] Optionally, the oil return assembly includes an oil pipe and an oil return pump provided on the oil pipe, one end of the oil pipe is connected to the bottom of the storage box, and the other end of the oil pipe is connected to the side wall of the oil tank.

[0029] By adopting the above technical solution, the quenching oil filtered in the storage box can be supplied back to the oil tank for use through the return oil pump.

[0030] Optionally, the machine further comprises a plurality of stirring mechanisms, wherein the stirring mechanisms comprise a second lifting cylinder, a stirring motor, a rotating shaft, and a paddle disposed on the rotating shaft, wherein the second lifting cylinder is disposed on the frame, and a lifting plate is disposed on the driving end of the second lifting cylinder;

[0031] The stirring motor is arranged on the lifting plate, the output shaft of the stirring motor is connected to one end of the rotating shaft, a pair of the lifting rods are located between the rotating shafts, and the paddles are located above the outer frame.

[0032] By adopting this technical solution, the second lifting cylinder drives the lifting plate, allowing the paddle to rise and fall synchronously. When quenching the tool, the paddle extends into the quenching oil to stir it, accelerating the flow of the oil and cooling the tool faster. When descaling the quenching oil, the paddle remains above the oil tank, without affecting the movement and static filters.

[0033] In a second aspect, the present application provides a method for treating a tool with a vacuum oil quenching device, which adopts the following technical solution:

[0034] A method for treating a tool by a vacuum oil quenching heat treatment device, comprising the following steps:

[0035] S1. Place the tool in the material frame, place the material frame in the heating chamber, heat the tool to 600-650℃ under a vacuum of 1×10-3Pa~1×10-2Pa and keep it warm for 20-60min;

[0036] S2. Under a vacuum degree of 1×10-2Pa to 1×10-1Pa, continue heating the tool to 850-900℃ and keep it warm for 90-180min;

[0037] S3. After the heating time is up, open the insulation door of the vacuum furnace body, start the translation cylinder to insert the lifting rod into the cannula, start the first lifting cylinder to rise to the set height, start the translation cylinder to move to the top of the static filter, then start the first lifting cylinder to lower and place the material frame on the static filter, and then start the translation cylinder to move away from the material frame to separate the lifting rod from the material frame;

[0038] S4. Oil quench the tool once. The quenching oil temperature is 100-110°C. Start the lifting motor and the second lifting cylinder to lower the blade and the material frame at the same time. The material frame and the tool are immersed in the quenching oil. After the blade is inserted into the quenching oil, start the stirring motor. The oil quenching time is 5-15 minutes.

[0039] S5. After the oil quenching time is up, start the lifting motor and the second lifting cylinder to reset the blades and the outer frame, and manually take the material frame out of the cooling chamber;

[0040] S6. Place the tool after the primary quenching into a new material frame, place the material frame in a heating chamber, and heat the tool after the primary oil quenching to 850-900°C under a vacuum of 1×10-1Pa to 1×100Pa and keep it warm for 30-60 minutes;

[0041] S7, repeat S3;

[0042] S8, perform secondary oil quenching on the tool, the quenching oil temperature is 50-60 ° C, start the lifting motor and the second lifting cylinder, make the blade and the material frame descend at the same time, immerse the material frame and the tool in the quenching oil, wait for the blade to extend into the quenching oil, start the stirring motor, and the oil quenching time is 5-15 minutes;

[0043] S9, repeat S5 to cool the tool after secondary quenching to room temperature;

[0044] S10. Manually remove the larger oxide scale from the static filter with the help of tools;

[0045] S11. Start the micro motor to drive the rotating rod to rotate so that the cam is not pressed against the inner frame. Start the lifting motor to drive the outer frame down to the bottom of the oil tank. Open the valve. The smaller oxide scale and the quenching oil in the discharge pipe flow into the storage box. Start the oil return pump. After the oil return pump runs for a set period of time, it stops running.

[0046] S12. Manually clean the oxide scale in the storage box regularly.

[0047] By adopting the above technical solution, the above twelve steps can be divided into two stages. The first is the tool heat treatment stage, in which the tool is heat treated by two vacuum oil quenchings, and the martensitic structure is formed by controlling, adjusting and coordinating the corresponding vacuum degree and quenching oil temperature, thereby improving the comprehensive performance of the tool.

[0048] The second stage is the quenching oil cleaning. After the tool heat treatment is completed, the larger oxide scale is manually removed from the static filter with the help of tools. Then the micro motor is started to drive the rotating rod to rotate so that the filter holes of the dynamic filter overlap with the filter mesh of the static filter. The lifting motor is then started to drive the outer frame down to the bottom of the oil tank. The valve is opened, and the smaller oxide scale is retained on the filter plate. The quenching oil is returned to the oil tank by the return oil pump to cool the tool. This can reduce the amount of oxide scale in the quenching oil, thereby slowing the deterioration of the quenching oil performance and extending the service life of the quenching oil. At the same time, the improved quenching oil performance can also improve the quenching quality of the tool.

[0049] In summary, this application includes at least one of the following beneficial technical effects:

[0050] 1. The larger oxide scale that falls off the tool is retained on the static filter. After the material frame and tool are removed, the larger oxide scale is manually removed from the static filter with the help of tools, thereby reducing the amount of oxide scale in the quenching oil and extending the service life of the quenching oil.

[0051] 2. The filter holes of the dynamic filter overlap with the filter mesh of the static filter, which can improve the filtration accuracy. Then the lifting mechanism is started to drive the static filter and the dynamic filter to descend, and the smaller oxide scale is intercepted on the cleaning mechanism and transported to the collecting mechanism for collection, thereby further reducing the amount of oxide scale in the quenching oil, thereby slowing down the deterioration of the quenching oil performance. At the same time, the improvement of the quenching oil performance can also improve the quenching quality of the tool;

[0052] 3. When the tool is quenching, the paddle is extended into the quenching oil to stir the quenching oil, speeding up the flow of the quenching oil and allowing the tool to cool faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a partial cross-sectional view of a vacuum oil quenching heat treatment device for a tool in an embodiment of the present application.

[0054] Figure 2 yes Figure 1 Enlarged view of part A.

[0055] Figure 3 It is a cross-sectional view of a vacuum oil quenching heat treatment device for a tool in an embodiment of the present application.

[0056] Figure 4 yes Figure 3 Magnified view of part B.

[0057] Figure 5 It is a cross-sectional view of the storage mechanism in the embodiment of the present application.

[0058] Reference numerals: 1. vacuum furnace body; 101. heating chamber; 102. cooling chamber; 2. oil tank; 3. static filter; 4. outer frame; 41. cavity; 5. cleaning mechanism; 51. inner frame; 52. dynamic filter; 53. driving assembly; 531. connecting plate; 532. spring; 54. position limiting assembly; 541. rotating rod; 542. cam; 543. micro motor; 544. sealing frame; 6. lifting mechanism; 61. screw; 62. lifting motor; 63. support plate; 7. transfer mechanism; 7 1. Translation cylinder; 72. First lifting cylinder; 73. Connecting plate; 74. Connecting rod; 75. Lifting rod; 8. Miscellaneous collection mechanism; 81. Miscellaneous storage box; 82. Filter plate; 83. Oil return assembly; 831. Oil pipe; 832. Oil return pump; 9. Stirring mechanism; 91. Second lifting cylinder; 92. Stirring motor; 93. Rotating shaft; 94. Paddle; 95. Lifting plate; 10. Frame; 11. Discharge pipe; 12. Valve; 13. Material frame; 131. Insert pipe; 14. Miscellaneous cleaning door; 15. Sealing door. DETAILED DESCRIPTION

[0059] The following is combined with Figure 1-5 This application is described in further detail.

[0060] The embodiment of the present application discloses a vacuum oil quenching heat treatment device for a cutting tool.

[0061] Reference Figure 1 and Figure 2 The vacuum oil quenching heat treatment device of the tool includes a vacuum furnace body 1, an oil tank 2, a static filter 3, an outer frame 4, a transfer mechanism 7, a lifting mechanism 6, a debris cleaning mechanism 5, a debris collecting mechanism 8 and a plurality of stirring mechanisms 9. The vacuum furnace body 1 includes a furnace body shell, and the furnace body shell is divided into a cooling chamber 102 and a heating chamber 101 by an insulation door. The chamber wall is provided with a chamber wall entrance and exit, and the chamber wall entrance and exit are installed with an insulation door. The insulation door is opened and closed by the insulation door lifting mechanism, so that the heating chamber 101 can be kept warm.

[0062] A cooling chamber door is installed on the side of cooling chamber 102 opposite heating chamber 101, and a heating chamber door is installed on the side of heating chamber 101 opposite cooling chamber 102. Several heating tubes are evenly installed along the circumference of heating chamber 101. A heating chamber platform is fixed inside heating chamber 101, and a material frame 13 for holding cutting tools is placed on the heating chamber platform. A vacuum mechanism and a gas charging and rapid cooling mechanism are installed on the furnace shell. The vacuum mechanism is connected to heating chamber 101 and cooling chamber 102, and a vacuum environment is created in heating chamber 101 and cooling chamber 102 through the vacuum mechanism. The gas charging and rapid cooling mechanism is connected to the top of cooling chamber 102, and can spray inert gas onto the cutting tools to cool them down.

[0063] Reference Figure 1 and Figure 2 A frame 10 is fixed in the cooling chamber 102, and an oil tank 2 is fixed on the frame 10. The oil tank 2 contains quenching oil. A discharge pipe 11 is connected to the bottom of the oil tank 2, and a valve 12 for shutting off the discharge pipe 11 is installed on the discharge pipe 11. The debris collection mechanism 8 is connected to the end of the discharge pipe 11 away from the oil tank 2. The oxide scale discharged from the oil tank 2 can be collected by the debris collection mechanism 8. The transfer mechanism 7 is installed on the top wall of the cooling chamber 102, and the material frame 13 can be moved from the heating chamber 101 to the static filter 3 by the moving mechanism. The static filter 3 is fixed on the outer frame 4, and the top wall of the static filter 3 is flush with the top wall of the outer frame 4. The debris cleaning mechanism 5 is installed on the outer frame 4 and is located below the static filter 3. The lifting mechanism 6 is installed in the oil tank 2, and the lifting mechanism 6 can drive the outer frame 4 to rise and fall.

[0064] Reference Figure 1 and Figure 2The lifting mechanism 6 includes a screw 61, a lifting motor 62, and a support plate 63. The support plate 63 is fixed to the inner wall of the cooling chamber 102 and is located above the liquid level of the quenching oil. The lifting motor 62 is mounted on the support plate 63. One end of the screw 61 is coaxially connected to the drive shaft of the lifting motor 62, and the other end of the screw 61 is rotatably connected to the bottom of the oil tank 2. The lifting motor 62 can drive the screw 61 to rotate. The outer frame 4 is threadedly connected to the screw 61, and the outer peripheral wall of the outer frame 4 is in contact with the inner wall of the oil tank 2. The oil tank 2 serves to guide the outer frame 4. When the screw 61 rotates, it can drive the outer frame 4 to rise or fall in the oil tank 2, so that the static filter 3 and the cleaning mechanism 5 can rise or fall synchronously. Then, under the action of gravity, the material frame 13 and the tool can be lowered synchronously with the static filter 3 and immersed in the quenching oil to quench the tool.

[0065] Reference Figure 2 The outer frame 4 has a cavity 41 defined within it. The cleaning mechanism 5 includes an inner frame 51, a dynamic filter 52, a limit assembly 54 located within the cavity 41, and a drive assembly 53. The inner periphery of the outer frame 4 is provided with a sliding hole connected to the cavity 41. The inner frame 51 is placed within the sliding hole and, driven by the drive assembly 53, can slide toward the limit assembly 54. The dynamic filter 52 is fixed to the inner frame 51, flush with its top surface, and in contact with the bottom surface of the static filter 3. In the initial state, the filter holes of the dynamic filter 52 and the filter holes of the static filter 3 are arranged to overlap one by one. When quenching the tool, the quenching oil can more smoothly pass through the dynamic filter 52 and the static filter 3 to cool the tool. At the same time, it can also intercept large oxide scale that falls off the tool and be trapped on the static filter 3, making it easier for workers to clean the large oxide scale.

[0066] The driving assembly 53 includes a connecting plate 531 and a plurality of springs 532 fixed on the connecting plate 531. The springs 532 are fixed to the cavity wall of the cavity 41. The inner frame 51 is fixed to the side of the connecting plate 531 facing away from the springs 532. Under the elastic force of the springs 532, the end of the inner frame 51 away from the connecting plate 531 is pressed against the limit assembly 54.

[0067] Reference Figure 2 、 Figure 3 and Figure 4The limiting assembly 54 includes a micromotor 543, a rotating rod 541, a cam 542 fixed to the rotating rod 541, and a sealing frame 544 fixed to the wall of the cavity 41. The sealing frame 544 and the wall of the cavity 41 form a sealed chamber. The micromotor 543 is installed in the sealed chamber. The sealed chamber isolates the micromotor 543 from the quenching oil, thereby reducing the possibility of the quenching oil affecting the operation of the micromotor 543. The rotating rod 541 is coaxially connected to the output shaft of the micromotor 543. The end of the rotating rod 541 away from the micromotor 543 passes through the sealing frame 544 and is rotatably connected to the wall of the cavity 41. Activating the micromotor 543 can drive the rotating rod 541 and cam 542 to rotate.

[0068] Reference Figure 2 、 Figure 3 and Figure 4 In the initial state, the inner frame 51, under the action of the spring 532, presses against the end of the cam 542 farther from the rotating rod 541, and the filter holes of the dynamic filter 52 overlap with the filter holes of the static filter 3. After quenching is completed, the large oxide scale that falls off the tool is trapped on the static filter 3. After the material frame 13 and the tool are removed, the large oxide scale is manually removed from the static filter 3 using tools, thereby reducing the amount of oxide scale in the quenching oil.

[0069] When it is necessary to clean smaller oxide scale, the micro motor 543 is activated to drive the rotating rod 541 to rotate, so that the cam 542 is no longer pressed against the inner frame 51. At the same time, the inner frame 51 is pressed against the sealing frame 544 under the drive of the spring 532, so that the filter holes of the dynamic filter 52 and the filter mesh of the static filter 3 can partially overlap, thereby improving the filtration accuracy of the dynamic filter 52 and the static filter 3 for oxide scale, so that smaller oxide scale can be cleaned. In addition, the dynamic filter 52 and the static filter 3 are closely connected, which further reduces the possibility of smaller oxide scale passing through the dynamic filter 52 and the static filter 3, thereby further improving the filtration accuracy of the dynamic filter 52 and the static filter 3 for oxide scale.

[0070] Then, the lifting motor 62 is activated to drive the outer frame 4 downward. During the downward movement of the outer frame 4, smaller oxide scale is intercepted on the bottom surface of the dynamic filter 52 until the outer frame 4 moves to the bottom of the oil tank 2. The valve 12 is opened, and the smaller oxide scale and the quenching oil in the discharge pipe 11 flow into the impurity collecting mechanism 8 for collection. This can further reduce the amount of oxide scale in the quenching oil, thereby slowing the deterioration of the quenching oil performance and extending the service life of the quenching oil. At the same time, the improved quenching oil performance can also improve the quenching quality of the tool.

[0071] Reference Figure 1 and Figure 5The waste collection mechanism 8 includes a waste storage box 81, a filter plate 82, and an oil return assembly 83. The oil return assembly 83 includes an oil pipe 831 and an oil return pump 832 mounted on the oil pipe 831. The waste storage box 81 is fixed to the frame 10 and connected to the discharge pipe 11. The filter plate 82 is densely covered with filter holes and is tilted inside the waste storage box 81. The quenching oil and smaller oxide scale in the discharge pipe 11 flow into the waste storage box 81. After being filtered by the filter plate 82, the oxide scale is trapped on the filter plate 82, and the quenching oil flows to the bottom of the waste storage box 81. One end of the oil pipe 831 is connected to the bottom of the waste storage box 81, and the other end of the oil pipe 831 is connected to the side wall of the oil tank 2. When the oil return pump 832 is activated, the quenching oil in the waste storage box 81 is returned to the oil tank 2 to cool the cutting tools.

[0072] In addition, a sealed door 15 is installed on the side wall of the storage box 81, and a cleaning door 14 is installed on the side wall of the cooling chamber 102. The staff regularly opens the cleaning door 14 and the sealed door 15, and uses tools to remove the oxide scale trapped on the filter plate 82, so that the filter plate 82 can better filter the quenching oil.

[0073] Reference Figure 1 The transfer mechanism 7 includes a translation cylinder 71, a first lifting cylinder 72, a connecting plate 73, a connecting rod 74, and a pair of lifting rods 75 fixed to the connecting rod 74. A pair of inserts 131 for the lifting rods 75 to pass through are fixed to the material frame 13. The translation cylinder 71 is mounted on the top wall of the cooling chamber 102, the connecting plate 73 is fixed to the driving end of the translation cylinder 71, and the first lifting cylinder 72 is mounted on the connecting plate 73. The translation cylinder 71 can drive the first lifting cylinder 72 toward or away from the heating chamber 101. The connecting rod 74 is fixed to the driving end of the first lifting cylinder 72, and the first lifting cylinder 72 can drive the lifting rod 75 toward or away from the static filter 3.

[0074] After the tool is heated in the heating chamber 101, the heat-insulating door lifting mechanism is activated to open the door, the translation cylinder 71 is activated to insert the lifting rod 75 into the cannula 131, and then the first lifting cylinder 72 is activated to raise the tool to the set height. The translation cylinder 71 is activated to move the tool above the static filter 3, and then the first lifting cylinder 72 is activated to lower the tool frame 13 onto the static filter 3. The translation cylinder 71 is activated to move away from the tool frame 13, causing the lifting rod 75 to separate from the tool frame 13. The lifting motor 62 is then activated to lower the static filter 3 and the tool frame 13, and the tool is immersed in the quenching oil for quenching. At the same time, the stirring mechanism 9 is activated to stir the quenching oil to accelerate the flow of the quenching oil, improve the cooling rate of the tool, and improve the quality of the tool.

[0075] Reference Figure 1 and Figure 3In this embodiment, the number of stirring mechanisms 9 is taken as a pair, and the pair of stirring mechanisms 9 are symmetrically arranged with the axis of the heating chamber 101 as the center. The stirring mechanism 9 includes a second lifting cylinder 91, a lifting plate 95, a stirring motor 92, a rotating shaft 93 and a paddle 94 fixed on the rotating shaft 93. The oil tank 2 is located between the pair of second lifting cylinders 91. The second lifting cylinder 91 is mounted on the frame 10, and the lifting plate 95 is fixed on the driving end of the second lifting cylinder 91. The lifting plate 95 can be driven to rise or fall by the second lifting cylinder 91. The stirring motor 92 is mounted on the lifting plate 95, and the output shaft of the stirring motor 92 is coaxially connected to the rotating shaft 93. The paddle 94 is located above the outer frame 4.

[0076] When the tool is quenching, the lifting motor 62 is started to descend and the second lifting cylinder 91 is started simultaneously, causing the paddle 94 and the material frame 13 to descend simultaneously. After the paddle 94 extends into the quenching oil, the stirring motor 92 is started to stir the quenching oil to accelerate the flow of the quenching oil and enable the tool to cool more quickly. After quenching is completed, the lifting motor 62 and the second lifting cylinder 91 are started to reset the outer frame 4 and the paddle 94. Then, the cooling chamber door is opened and the material frame 13 is manually removed.

[0077] The implementation principle of the vacuum oil quenching heat treatment device for a tool in an embodiment of the present application is as follows: after the tool is heated in the heating chamber 101, the insulation door lifting mechanism is started to open the insulation door, the transfer mechanism 7 is started to move the material frame 13 to the static filter 3, and then the lifting motor 62 and the second lifting cylinder 91 are started to make the paddle 94 and the material frame 13 descend at the same time, so that the material frame 13 and the tool are immersed in the quenching oil. After the paddle 94 is extended into the quenching oil, the stirring motor 92 is started to make the paddle 94 stir the quenching oil to accelerate the flow of the quenching oil so that the tool can be cooled faster.

[0078] After quenching is completed, the lifting motor 62 and the second lifting cylinder 91 are started to reset the outer frame 4 and the blade 94, and then the cooling chamber door is opened, the material frame 13 is manually taken out, and the quenched tool is further processed.

[0079] The larger oxide scale is then manually removed from the static filter 3 using a tool. The micromotor 543 is then activated to drive the rotating rod 541, freeing the cam 542 from contact with the inner frame 51. The pores of the dynamic filter 52 now overlap with those of the static filter 3, improving the filtration accuracy of the oxide scale by both the dynamic and static filters 52 and 3. The lifting motor 62 is then activated to lower the outer frame 4. During this descent, the smaller oxide scale is trapped on the bottom of the dynamic filter 52 until the outer frame 4 reaches the bottom of the oil tank 2. Valve 12 is then opened, allowing the smaller oxide scale and the quenching oil in the discharge pipe 11 to flow into the sump 81. The smaller oxide scale is trapped on the filter plate 82, while the quenching oil flows to the bottom of the sump 81. The return oil pump 832 is then activated to return the quenching oil in the sump 81 to the oil tank 2, cooling the cutting tools. This can reduce the amount of oxide scale in the quenching oil, thereby slowing down the rate at which the quenching oil's performance deteriorates and extending the service life of the quenching oil. At the same time, improving the quenching oil's performance can also improve the quenching quality of the tool.

[0080] The embodiment of the present application also discloses a processing method using a vacuum oil quenching heat treatment device for a cutting tool.

[0081] A processing method using a vacuum oil quenching heat treatment device for a cutting tool comprises the following steps:

[0082] S1. Place the tool in the material frame 13, place the material frame 13 on the heating chamber platform, heat the tool to 600-650°C and keep it warm for 20-60 minutes under a vacuum degree of 1×10-3Pa~1×10-2Pa.

[0083] S2. Under a vacuum degree of 1×10-2Pa to 1×10-1Pa, continue heating the tool to 850-900℃ and keep it warm for 90-180min.

[0084] S3. After the heating time is up, the heat insulation door lifting mechanism is activated to open the heat insulation door. The translation cylinder 71 is activated to insert the lifting rod 75 into the cannula 131. The first lifting cylinder 72 is activated to rise to a set height. The translation cylinder 71 is activated to move above the static filter 3. During this process, the air charging and rapid cooling mechanism is activated to spray inert gas to cool the tool. After the spraying time is set, the air charging and rapid cooling mechanism is stopped. The first lifting cylinder 72 is then activated to lower the material frame 13 and place it on the static filter 3. The translation cylinder 71 is then activated to move away from the material frame 13, causing the lifting rod 75 to separate from the material frame 13.

[0085] S4. The tool is oil-quenched once. The quenching oil temperature is 100-110°C. The lifting motor 62 and the second lifting cylinder 91 are started to simultaneously lower the paddle 94 and the material frame 13. The material frame 13 and the tool are immersed in the quenching oil. After the paddle 94 is inserted into the quenching oil, the stirring motor 92 is started to stir the quenching oil to accelerate the flow of the quenching oil and allow the tool to cool faster. The oil quenching time is 5-15 minutes.

[0086] S5. After the oil quenching time is up, the lifting motor 62 and the second lifting cylinder 91 are started to reset the blade 94 and the outer frame 4, and the material frame 13 is manually taken out of the cooling chamber 102;

[0087] S6. Place the tool after the primary quenching into a new material frame 13, place the material frame 13 on the heating chamber platform, and heat the tool after the primary oil quenching to 850-900°C and keep it warm for 30-60 minutes under a vacuum of 1×10-1Pa to 1×100Pa.

[0088] S7, repeat S3;

[0089] S8. Perform secondary oil quenching on the tool. The quenching oil temperature is 50-60°C. Start the lifting motor 62 and the second lifting cylinder 91 to lower the paddle 94 and the material frame 13 simultaneously. The material frame 13 and the tool are immersed in the quenching oil. After the paddle 94 is inserted into the quenching oil, start the stirring motor 92. The oil quenching time is 5-15 minutes.

[0090] S9, repeat S5 to cool the tool after secondary quenching to room temperature;

[0091] S10, manually remove the larger oxide scale from the static filter 3 with the help of tools;

[0092] S11. Start the micro motor 543 to drive the rotating rod 541 to rotate so that the cam 542 is not pressed against the inner frame 51. Start the lifting motor 62 to drive the outer frame 4 down to the bottom of the oil tank 2. Open the valve 12. The smaller oxide scale and the quenching oil in the discharge pipe 11 flow into the storage box 81. Turn on the return oil pump 832. The return oil pump 832 stops running after running for the set time.

[0093] S12. Manually open the cleaning door 14 and the sealing door 15 regularly, and use tools to remove the oxide scale trapped on the filter plate 82 so that the filter plate 82 can better filter the quenching oil.

[0094] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A vacuum oil quenching heat treatment device for cutting tools, comprising a vacuum furnace body (1), a material frame (13) for holding cutting tools placed in a heating chamber (101) of the vacuum furnace body (1), and an oil tank (2) provided in a cooling chamber (102) of the vacuum furnace body (1), characterized in that: It also includes a static filter (3), an outer frame (4), a lifting mechanism (6), a transfer mechanism (7) for transferring the material box from the heating chamber (101) to the static filter (3), a cleaning mechanism (5) for removing oxide scale from the quenching oil, and a collecting mechanism (8) for collecting oxide scale, wherein the transfer mechanism (7) is arranged in the cooling chamber (102); A frame (10) is provided in the cooling chamber (102), the oil tank (2) is provided on the frame (10), the lifting mechanism (6) is provided in the oil tank (2) and is used to drive the outer frame (4) to rise and fall, the static filter (3) is provided on the outer frame (4), and the debris cleaning mechanism (5) is provided on the outer frame (4) and is located below the static filter (3); One end of the debris collecting mechanism (8) is connected to the bottom of the oil tank (2), and the other end of the debris collecting mechanism (8) is connected to the side wall of the oil tank (2); The debris cleaning mechanism (5) comprises an inner frame (51), a dynamic filter (52) provided on the inner frame (51), a position limiting assembly (54), and a driving assembly (53) for driving the inner frame (51) to move in translation; a cavity (41) is provided in the outer frame (4); and the inner frame (51) is slidably provided on the outer frame (4); The inner frame (51) is located between the driving assembly (53) and the limiting assembly (54), and both the driving assembly (53) and the limiting assembly (54) are arranged in the cavity (41), and the inner frame (51) is tightly pressed against the limiting assembly (54).

2. The vacuum oil quenching heat treatment device for a tool according to claim 1, characterized in that: The driving assembly (53) includes a connecting plate (531) and a plurality of springs (532) arranged on the connecting plate (531), the springs (532) are arranged on the cavity wall of the cavity (41), and the inner frame (51) is arranged on the connecting plate (531).

3. The vacuum oil quenching heat treatment device for a tool according to claim 1, characterized in that: The limiting assembly (54) comprises a rotating rod (541), a cam (542) arranged on the rotating rod (541) and a micro motor (543) for driving the rotating rod (541) to rotate. A sealing frame (544) is provided in the cavity (41). The sealing frame (544) and the cavity wall of the cavity (41) form a sealed cavity. The micro motor (543) is arranged in the sealed cavity. One end of the rotating rod (541) away from the micro motor (543) is rotatably connected to the cavity wall of the cavity (41), and the inner frame (51) is tightly pressed against the cam (542).

4. The vacuum oil quenching heat treatment device for a tool according to claim 1, characterized in that: The lifting mechanism (6) includes a screw (61) and a lifting motor (62) for driving the screw (61) to rotate. A support plate (63) is provided on the inner wall of the cooling chamber (102). The lifting motor (62) is provided on the support plate (63). One end of the screw (61) away from the lifting motor (62) is rotatably connected to the bottom of the oil tank (2). The outer frame (4) is threadedly connected to the screw (61), and the outer peripheral wall of the outer frame (4) is in contact with the inner wall of the oil groove (2).

5. The vacuum oil quenching heat treatment device for a tool according to claim 1, characterized in that: The transfer mechanism (7) includes a translation cylinder (71), a first lifting cylinder (72), a connecting plate (73) provided at the driving end of the translation cylinder (71), a connecting rod (74) provided at the driving end of the first lifting cylinder (72), and a pair of lifting rods (75) provided on the connecting rod (74); the translation cylinder (71) is provided on the inner wall of the cooling chamber (102); the first lifting cylinder (72) is provided on the connecting plate (73); and the material frame (13) is provided with a pair of inserting tubes (131) for the lifting rods (75) to penetrate.

6. The vacuum oil quenching heat treatment device for a cutting tool according to claim 1, characterized in that: The bottom of the oil tank (2) is connected to a discharge pipe (11), and a valve (12) is provided on the discharge pipe (11). The debris collection mechanism (8) comprises a debris storage box (81), a filter plate (82) and an oil return assembly (83). The debris storage box (81) is provided on the frame (10) and is connected to the discharge pipe (11). The filter plate (82) is provided with a plurality of filter holes. The filter plate (82) is tiltedly arranged in the storage box (81). One end of the oil return assembly (83) is connected to the bottom of the storage box (81), and the other end of the oil return assembly (83) is connected to the side wall of the oil tank (2).

7. The vacuum oil quenching heat treatment device for a tool according to claim 6, characterized in that: The oil return assembly (83) comprises an oil pipe (831) and an oil return pump (832) provided on the oil pipe (831); one end of the oil pipe (831) is connected to the bottom of the storage box (81); and the other end of the oil pipe (831) is connected to the side wall of the oil tank (2).

8. The vacuum oil quenching heat treatment device for a cutting tool according to claim 5, characterized in that: The machine also includes a plurality of stirring mechanisms (9), wherein the stirring mechanisms (9) include a second lifting cylinder (91), a stirring motor (92), a rotating shaft (93), and a paddle (94) provided on the rotating shaft (93); the second lifting cylinder (91) is provided on the frame (10); and a lifting plate (95) is provided at the driving end of the second lifting cylinder (91); The stirring motor (92) is arranged on the lifting plate (95), the output shaft of the stirring motor (92) is connected to one end of the rotating shaft (93), a pair of lifting rods (75) are located between the rotating shafts (93), and the paddle (94) is located above the outer frame (4).

9. A method for treating a cutting tool using the vacuum oil quenching heat treatment device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Place the tool in a material frame (13), place the material frame (13) in a heating chamber (101), heat the tool to 600-650° C. and keep it warm for 20-60 minutes under a vacuum of 1×10-3Pa to 1×10-2Pa; S2. Under a vacuum degree of 1×10-2Pa to 1×10-1Pa, continue heating the tool to 850-900℃ and keep it warm for 90-180min; S3. After the heating time is up, the heat-insulating door of the vacuum furnace body (1) is opened, the translation cylinder (71) is started to insert the lifting rod (75) into the insertion tube (131), the first lifting cylinder (72) is started to rise to a set height, the translation cylinder (71) is started to move to the top of the static filter (3), and then the first lifting cylinder (72) is started to descend to place the material frame (13) on the static filter (3), and then the translation cylinder (71) is started to move in a direction away from the material frame (13), so that the lifting rod (75) is separated from the material frame (13); S4, oil quenching the tool once, the quenching oil temperature is 100-110°C, the lifting motor (62) and the second lifting cylinder (91) are started, the blade (94) and the material frame (13) are lowered at the same time, the material frame (13) and the tool are immersed in the quenching oil, and after the blade (94) is extended into the quenching oil, the stirring motor (92) is started, and the oil quenching time is 5-15 minutes; S5. After the oil quenching time is up, the lifting motor (62) and the second lifting cylinder (91) are started to reset the blade (94) and the outer frame (4), and the material frame (13) is manually taken out of the cooling chamber (102); S6. Place the tool after the primary quenching into a new material frame (13), place the material frame (13) in a heating chamber (101), and heat the tool after the primary oil quenching to 850-900° C. and keep the temperature for 30-60 minutes under a vacuum degree of 1×10-1Pa to 1×100Pa; S7, repeat S3; S8, the tool is subjected to secondary oil quenching, the quenching oil temperature is 50-60°C, the lifting motor (62) and the second lifting cylinder (91) are started, the blade (94) and the material frame (13) are lowered at the same time, the material frame (13) and the tool are immersed in the quenching oil, and after the blade (94) is extended into the quenching oil, the stirring motor (92) is started, and the oil quenching time is 5-15 minutes; S9, repeat S5 to cool the tool after secondary quenching to room temperature; S10, manually removing the larger oxide scale from the static filter (3) with the help of tools; S11, start the micro motor (543) to drive the rotating rod (541) to rotate, so that the cam (542) is not pressed against the inner frame (51), start the lifting motor (62) to drive the outer frame (4) to descend to the bottom of the oil tank (2), open the valve (12), and the smaller oxide scale and the quenching oil in the discharge pipe (11) flow into the storage box (81), start the return oil pump (832), and stop the return oil pump (832) after running for the set time; S12, manually cleaning the oxide scale in the storage box (81) regularly.

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