Cold water treatment process and device for reducing content of retained austenite in internal structure of bearing steel ball

Abstract

The invention discloses a cold water treatment process and device for reducing the content of retained austenite in the internal structure of a bearing steel ball, the bearing steel ball poured into a quenching oil pool is taken out from the quenching oil pool and drained, and then is rapidly immersed into another cold water pool with the water temperature controlled to be below 10 DEG C to be cooled again; after the bearing steel balls are cooled, the bearing steel balls are quickly fished out and drained; then pouring into a vertical high-speed centrifugal drying machine for dehydration operation; and after water stains on the surfaces of the steel balls are removed, the steel balls can be quickly put into a tempering furnace to be subjected to primary tempering. The cold oil is put into cold water after quenching, and the cooling speed of the cold water is higher than that of the cold oil. The cooling speed of the interior of the steel ball can be further increased, transformation from austenite to martensite is more thorough, rapid cooling in cold water can avoid an area where the austenite exists stably, austenite decomposition is promoted, and after cold oil quenching, a certain amount of austenite possibly exists in the steel ball, so that the quality of the steel ball is improved. And cooling treatment is continued to reduce the austenite content in the steel ball.

Description

Technical Field

[0001] The invention relates to the field of bearing steel ball manufacturing, and in particular to a cold water treatment process and a device thereof for reducing the content of residual austenite in the internal structure of a bearing steel ball. Background Art

[0002] In the manufacturing process of bearing steel balls, the content of retained austenite has an important influence on the performance of the steel balls. Too high austenite content may lead to a decrease in the hardness, wear resistance and other properties of the steel balls. Traditional treatment processes have certain limitations in reducing the content of retained austenite, and it is difficult to effectively reduce the content of retained austenite while ensuring efficiency.

[0003] The Chinese invention patent CN115896403A discloses a rapid tempering process for a bearing steel ball after quenching and then soaking it in cold oil. The key process of the present invention is to take out the GCr15 bearing steel ball after quenching from the quenching oil pool and drain the oil for about 15 minutes, and then quickly immerse it in another tempering oil pool with an oil temperature controlled at 10-15 degrees Celsius for cooling again, and the cooling time is controlled at 18-22 minutes. After the steel ball cooled by cold oil is fished out from the cold oil pool and drained, it is quickly placed in a tempering furnace for tempering. The tempering oil temperature is controlled at about 150 degrees Celsius for 3 hours. The GCr15 bearing steel ball that is tempered after cold oil treatment has a much lower residual austenite content in its internal structure, and the quenched martensite is transformed into tempered martensite, and the deformation factor of the steel ball is greatly reduced. Thereby, the comprehensive mechanical properties such as hardness, strength, wear resistance and service life of the steel ball are greatly improved.

[0004] Traditionally, steel balls are heated and then quenched in cold oil to eliminate austenite. Although the cooling rate of the oil is relatively fast, there is still a limit. For bearing steel, austenite is more difficult to exist stably at a faster cooling rate and will be more transformed into other tissues. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In order to solve the problems raised in the above background technology, the present invention adopts the following technical solutions.

[0007] A cold water treatment process for reducing the content of retained austenite in the internal structure of a bearing steel ball, characterized in that the steps are as follows: Step 1: Equipment preparation: Prepare the equipment required for cold water treatment, and the temperature control accuracy and stirring effect must meet the process requirements; Step 2, heating: put the bearing steel ball into the heating furnace and heat it to the quenching temperature, which is 800℃-850℃. During the heating process, ensure that the steel ball is heated evenly; Step 3, heat preservation: heat preservation at the quenching temperature to make the internal structure of the steel ball fully austenitized, and the heat preservation time is 30 minutes; Step 4, quenching and cooling: quickly put the steel ball into cold water for quenching and cooling, inhibit the transformation of austenite to pearlite and other structures, so as to obtain martensite structure. During the quenching and cooling process, a stirring device can be used to make the cold water flow to ensure uniform cooling of the steel ball and reduce deformation and cracking tendency; Step 5, low temperature treatment: the quenched steel ball is immediately placed in a low temperature cold water pool for cold treatment, the temperature is controlled below 10°C, and the treatment time is at least 3 hours. During the deep cold treatment process, austenite will undergo further transformation at low temperature, and part of the austenite will transform into martensite, thereby reducing the austenite content. The generated oil fume mixture is discharged through the fan and pipeline, and the temperature of the cooling water is cooled and recycled through the outdoor cold air fan; Step 6, drying: After the bearing steel balls are cooled, quickly remove them and drain them, and pour the bearing steel balls into a vertical high-speed centrifugal dryer for dehydration; Step 7, tempering: the steel balls after cold water treatment are placed in a tempering furnace for tempering treatment. The tempering temperature is 150℃-250℃. The tempering heating speed should not be too fast to avoid generating new internal stress. Step 8, cooling: Keep the steel ball at the tempering temperature to further stabilize the internal structure of the steel ball, eliminate the internal stress generated during quenching and cold water treatment, and improve the toughness and dimensional stability of the steel ball. The heat preservation time is at least 2 hours, and then cool it. The cooling speed should not be too fast to avoid generating new internal stress.

[0008] In response to the above process, the present application also provides a cold water treatment device for reducing the residual austenite content in the internal structure of a bearing steel ball, comprising a treatment box, which is divided into a quenching oil pool and a cold water pool by a partition, wherein the quenching oil pool performs the quenching cooling in the step, and the cold water pool performs the low-temperature treatment in the step.

[0009] Preferably, fixing cards are clamped at the four corners of the upper surface of the processing box, and connecting holes are opened on the outer side of the fixing cards. Bolts are connected to the inner threads of the connecting holes, and the ends of the bolts abut against the outer wall of the processing box. A column is welded on the upper surface of the fixing card, and a crossbeam is movably sleeved on the column. A rack frame plate is arranged between the crossbeams, and a connecting frame is slidably connected to the rack frame plate. A connecting frame is installed on the rack frame plate at the end of the connecting frame, and a winch is placed on the connecting plate. A second drive is installed at one end of the winch, a chain is wound on the winch, and a placement frame is pulled at the tail of the chain.

[0010] Preferably, a protrusion is provided on the upper surface of the rack frame plate, a receiving groove is opened in the protrusion, and saw teeth are equidistantly provided on one of the side walls in the length direction of the receiving groove. A first driver is installed on the upper surface of the connecting frame, and the driving end of the first driver passes through the connecting frame and is connected to a gear, and the gear is located in the receiving groove and meshes with the saw teeth.

[0011] Preferably, a sliding groove is provided on the side of the rack frame plate, and pulleys are symmetrically provided on the lower surface of the connecting frame, and the pulleys are slidably connected in the sliding groove.

[0012] Preferably, a placement hole is opened in the center of the connection plate, and the winch is placed directly above the placement hole, and the chain passes through the placement hole and passes through the connection plate to extend into the processing box.

[0013] Preferably, a discharge port is provided on the front surface of the placement frame, and a frame door is connected to the discharge port via a hinge, and a latch is provided at the edge of the frame door, which is fixed relative to the placement frame via the latch.

[0014] Preferably, a plurality of through holes are equidistantly provided on the column, and a plug-in hole is provided on the crossbeam corresponding to the socketed position with the column, a clamping plate is provided on the side of the crossbeam and outside the plug-in hole, a plug-in column is penetrated by the clamping plate, and the plug-in column penetrates the plug-in hole and the through hole in turn to fix the crossbeam on the column, a spring is sleeved on the plug-in column, a protrusion is provided on the plug-in column to abut against one end of the spring, and the other end of the spring abuts against the inner side of the clamping plate, and the ends of the plug-in column on the same crossbeam are connected to a connecting rod through screws.

[0015] Preferably, the height of the quenching oil pool is higher than that of the cold water pool, and the columns arranged at the four corners of the upper surface of the processing box are respectively located at the outer ends of the quenching oil pool and the cold water pool, and the upper surfaces of the columns arranged on the quenching oil pool and the cold water pool are flush.

[0016] Preferably, the quenching oil pool and the cold water pool are provided with supporting edges at the outer upper edges, and the processing box is covered with a sealing cover, the sealing cover is placed on the supporting edges, and ventilation holes are opened on the sealing cover facing the quenching oil pool and the cold water pool, exhaust pipes are installed on the ventilation holes, the exhaust pipes are externally connected to the exhaust fan, and the sealing cover is hoisted by an assembly crane.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) In the present invention, the steel ball is placed in cold water after cold oil quenching, and the cooling rate of cold water is faster than that of cold oil. This can further accelerate the cooling rate inside the steel ball, making the transformation of austenite to martensite more thorough. Rapid cooling in cold water can avoid the area where austenite exists stably, and promote the decomposition of austenite. After cold oil quenching, a certain amount of austenite may still exist inside the steel ball. This part of austenite cannot be completely transformed due to the limitation of the cooling rate of cold oil. Subsequent cold water quenching can continue to cool these residual austenite, so that they continue to transform into stable structures such as martensite, thereby reducing the austenite content inside the steel ball.

[0018] (2) During the cold oil quenching in the present invention, a certain amount of tissue stress will be generated inside the steel ball. When it is placed in cold water for quenching again, the new cooling process will adjust the existing tissue stress distribution. This stress adjustment is conducive to the decomposition of austenite, because the change in tissue stress will affect the diffusion of atoms and the transformation of the lattice, causing the energy state of austenite to change, thereby prompting it to transform into a more stable tissue, thereby reducing the austenite content, and the internal tissue of the steel ball after cold oil quenching is in a metastable state. After being placed in cold water, the drastic cooling and stress changes brought by the cold water will provide more driving force for the transformation of austenite to martensite. The increase in this driving force helps to overcome the energy barrier in the austenite transformation process, allowing more austenite to transform, and ultimately achieving the purpose of reducing the austenite inside the steel ball.

[0019] (3) The integrated device of the present invention allows the steel balls to quickly enter the cold water pool for low-temperature treatment after quenching in the quenching oil pool. Since austenite is in an unstable state after quenching, entering the next cooling process in a shorter time can avoid partial tempering of austenite in the intermediate process or other structural transformations that are not conducive to reducing the austenite content. From the perspective of austenite transformation kinetics, the continuous treatment process can enable austenite to continuously transform into martensite under a suitable cooling path, reducing the stable existence time of austenite, thereby helping to reduce the content of residual austenite.

[0020] (4) The integrated design of the quenching oil pool and the cold water pool of the present invention enables the entire cooling process to be carried out more accurately according to the preset cooling curve. During the quenching and cooling process of the bearing steel ball, different cooling stages require different cooling rates to promote the transformation of austenite to stable structures such as martensite. Through the integrated device, the transition from the quenching oil pool to the cold water pool can be better adjusted to ensure that austenite is transformed along the ideal austenite isothermal transformation curve during the entire cooling process, thereby improving the efficiency of the transformation from austenite to martensite and reducing the content of residual austenite. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The three-dimensional structure of the cold water treatment process device in the present invention Figure 1 .

[0022] Figure 2 The three-dimensional structure of the cold water treatment process device in the present invention Figure 2 .

[0023] Figure 3 The internal structure of the cold water treatment process device in the present invention Figure 1 .

[0024] Figure 4 The internal structure of the cold water treatment process device in the present invention Figure 2 .

[0025] Figure 5 It is a top view of the hoisting mechanism in the cold water treatment process device of the present invention.

[0026] Figure 6 for Figure 5 A partial enlarged view of the fixed plug-in at point A in the middle.

[0027] Figure 7 It is a front view of the lifting assembly in the present invention.

[0028] The corresponding relationship between the illustrations and component names in the figure is as follows: 100, treatment box; 101, quenching oil pool; 102, cold water pool; 103, support edge; 104, sealing cover; 105, exhaust pipe; 200, rack frame plate; 201, crossbeam; 202, column; 2021, fixing card; 203, card plate; 2031, plug column; 2032, spring; 2033, connecting rod; 204, connecting frame; 2041, pulley; 2042, connecting plate; 205, first drive; 2051, gear; 206, winch; 2061, second drive; 2062, chain; 207, placement frame; 2071, frame door; 2072, latch. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0032] A cold water treatment process for reducing the content of retained austenite in the internal structure of a bearing steel ball, the steps are as follows: 1. Equipment preparation: Prepare the equipment required for cold water treatment, and the temperature control accuracy and stirring effect must meet the process requirements; 2. Heating: Place the bearing steel ball in a heating furnace and heat it to the quenching temperature, which is 800℃-850℃. The specific temperature can be adjusted according to the type of steel and actual requirements. During the heating process, ensure that the steel ball is heated evenly; 3. Insulation: Insulate at the quenching temperature to fully austenitize the internal structure of the steel ball. The insulation time is determined according to the size of the steel ball and the amount of furnace loading, and is generally at least 30 minutes; 4. Quenching and cooling: quickly put the steel ball into cold water for quenching and cooling. The cooling speed should be fast enough to inhibit the transformation of austenite to pearlite and other structures, so as to obtain martensite structure. A stirring device can be used during the quenching and cooling process to make the cold water flow, ensure uniform cooling of the steel ball, and reduce deformation and cracking tendency; 5. Low temperature treatment: After quenching, the steel ball is immediately placed in a low temperature cold water pool for cold treatment. The temperature is controlled below 10°C and the treatment time is at least 3 hours. During the deep cold treatment, austenite will undergo further transformation at low temperature, and part of the austenite will transform into martensite, thereby reducing the austenite content. The generated oil fume mixture is discharged through the fan and pipeline, and the temperature of the cooling water is cooled and circulated through the outdoor cold air fan; during the cold water treatment process, the temperature and treatment time of the cold water must be strictly controlled to ensure that the expected austenite content reduction effect is achieved. At the same time, attention should be paid to the deformation of the steel ball during the cold water treatment process, and appropriate anti-deformation measures can be taken if necessary; 6. Drying: After the bearing steel balls have cooled, quickly remove them and drain the water, and pour the bearing steel balls into a vertical high-speed centrifugal dryer for dehydration; 7. Tempering: After cold water treatment, the steel ball is placed in a tempering furnace for tempering treatment. The tempering temperature is 150℃-250℃. The specific temperature can be adjusted according to the performance requirements of the steel ball. The tempering heating speed should not be too fast to avoid generating new internal stress. 8. Cooling: Keep the steel ball at the tempering temperature to further stabilize the internal structure of the steel ball, eliminate the internal stress generated during quenching and cold water treatment, and improve the toughness and dimensional stability of the steel ball. The holding time is generally 2 hours to several hours, and then cool it. The cooling speed should not be too fast to avoid generating new internal stress.

[0033] This embodiment also provides a device using the above-mentioned cold water treatment process to reduce the content of retained austenite in the internal structure of the bearing steel ball, such as Figure 1 As shown in Figure 2, the device of the cold water treatment process in this embodiment includes a treatment box 100. In this embodiment, the treatment box 100 is divided into a quenching oil pool 101 and a cold water pool 102 by a partition, wherein the quenching oil pool 101 performs the quenching cooling in step 4, and the cold water pool 102 performs the low-temperature treatment in step 5. In this embodiment, the steel ball is cold-oil quenched and then cold-water quenched, which can make the steel ball obtain higher hardness and better wear resistance. During the cold oil quenching process, a layer of martensite structure is formed on the surface of the steel ball, and the cold water quenching further refines the martensite structure, thereby improving the hardness and wear resistance of the steel ball. This quenching method can more effectively reduce the residual austenite content inside the steel ball. After cold oil quenching, there may still be a certain amount of austenite inside the steel ball, and the rapid cooling of cold water quenching can make these austenites continue to transform into martensite, thereby reducing the content of residual austenite and improving the organizational stability of the steel ball.

[0034] See also Figure 3 , Figure 4 as well as Figure 5 In this embodiment, the four corners of the upper surface of the processing box 100 are all clamped with fixing cards 2021, and the upper surface of the fixing cards 2021 is welded with a column 202. In this embodiment, the column 202 is clamped on the processing box 100 through the fixing cards 2021, so that the column 202 can be erected on the processing box 100. At the same time, a connecting hole is opened on the outside of the fixing card 2021, and a bolt is connected with the thread in the connecting hole. The end of the bolt abuts against the outer wall of the processing box 100 to ensure that the fixing card 2021 can be firmly clamped on the processing box 100. Further, a crossbeam 201 is movably sleeved on the column 202, and a rack frame plate 200 is erected between the crossbeams 201. A connecting frame 204 is slidably connected to the rack frame plate 200. Figure 7As shown, the end of the connecting frame 204 in this embodiment is equipped with a connecting plate 2042, and a winch 206 is placed on the connecting plate 2042. A second driver 2061 is installed at one end of the winch 206. A chain 2062 is wound on the winch 206, and a placement frame 207 is pulled at the tail of the chain 2062. In this embodiment, the heated steel ball is placed in the placement frame 207, and the second driver 2061 drives the winch 206 to rotate and place the chain 2062 below, so that the placement frame 207 is immersed in the quenching oil pool 101 for quenching. After quenching, the winch 206 is started again to rewind the chain 2062 to lift the placement frame 207 and keep it for a certain time to drain the oil. When the draining is completed, the steel ball needs to be placed in the cold water pool 102. Therefore, in this embodiment, the rack frame plate 200 A protrusion is provided on the upper surface, and a receiving groove is provided in the protrusion. Saw teeth are equidistantly provided on one of the side walls in the length direction of the receiving groove. A first driver 205 is installed on the upper surface of the connecting frame 204. The driving end of the first driver 205 passes through the connecting frame 204 and is connected to a gear 2051. The gear 2051 is located in the receiving groove and meshes with the saw teeth. The gear 2051 is driven to rotate by the first driver 205. When the gear 2051 rotates, it meshes and rolls with the saw teeth, thereby causing the connecting frame 204 to move on the rack frame plate 200, thereby driving the winch 206 installed on the connecting plate 2042 to move toward the cold water pool 102. At this time, the second driver 2061 drives the winch 206 to rotate again to place the chain 2062 below, so that the placement frame 207 is immersed in the cold water pool 102.

[0035] See also Figure 7 In this embodiment, a slide groove is opened on the side of the rack frame plate 200, and a pulley 2041 is symmetrically provided on the lower surface of the connecting frame 204, which is slidably connected in the slide groove by the pulley 2041 to ensure the stability of the connecting frame 204 during operation; further, in this embodiment, a placement hole is opened in the center of the connecting plate 2042, and the winch 206 is placed directly above the placement hole, and the chain 2062 passes through the connection plate 2042 through the placement hole and extends into the processing box 100.

[0036] Continue reading Figure 7 When the steel balls are cooled, the placement frame 207 is raised by the winch 206 winding chain 2062, and the steel balls in the placement frame 207 are drained. After draining, the steel balls need to be poured into a high-speed centrifugal dryer for dehydration. Therefore, in this embodiment, a discharge port is opened on the front surface of the placement frame 207, and a frame door 2071 is connected to the discharge port by a hinge. A latch 2072 is provided at the edge of the frame door 2071, and the frame door 2071 is relatively fixed to the placement frame 207 by the latch 2072. The placement frame 207 in this embodiment moves on the rack frame plate 200 to the edge of the cold water pool 102 through the connecting frame 204. At this time, the latch 2072 is pushed to open the frame door 2071, and the steel balls in the placement frame 207 are taken out and placed in the high-speed centrifugal dryer.

[0037] When the crossbeam 201 is located at the upper end of the column 202, when the chain 2062 is rolled up, the distance between the placement frame 207 and the processing box 100 is the highest, which is conducive to the draining of the steel balls. However, when the number of steel balls in the placement frame 207 is large, the height of the crossbeam 201 is too large, which will make the crossbeam 201 unstable. At this time, it is necessary to lower the height of the crossbeam 201 on the column 202 to ensure stability. Therefore, refer to Figure 4-6 In this embodiment, a plurality of through holes are equidistantly provided on the column 202, and a plug hole is provided on the cross beam 201 corresponding to the socket connection with the column 202. A clamping plate 203 is provided on the side of the cross beam 201 and outside the plug hole. A plug post 2031 is penetrated on the clamping plate 203. The plug post 2031 penetrates the plug hole and the through hole in sequence to fix the cross beam 201 on the column 202. A spring 2032 is sleeved on the plug post 2031. A protrusion is provided on the plug post 2031 to abut against one end of the spring 2032, and the other end of the spring 2032 abuts against the inside of the clamping plate 203. On the other hand, the ends of the plug posts 2031 on the same beam 201 are connected to the connecting rod 2033 through screws. In this embodiment, the plug posts 2031 are pulled out of the clamping plate 203 by the connecting rod 2033, so that the plug posts 2031 are disengaged from the plug-in holes and the through holes. At this time, the beam 201 can be moved on the column 202. After adjusting to a suitable position, the connecting rod 2033 is released, and the plug posts 2031 are reinserted into the new plug-in holes and the through holes under the rebound force of the spring 2032 to fix the beam 201.

[0038] See also Figure 2 When the steel ball is immersed in the quenching oil pool 101, the oil in the quenching oil pool 101 will heat up. If cold water drops into the quenching oil pool 101, splashing will occur. Therefore, in this embodiment, the height of the quenching oil pool 101 is higher than the height of the cold water pool 102, and the columns 202 arranged at the four corners of the upper surface of the processing box 100 are respectively located at the outer ends of the quenching oil pool 101 and the cold water pool 102, and the upper surfaces of the columns 202 arranged on the quenching oil pool 101 and the cold water pool 102 are flush.

[0039] See also Figure 1 and Figure 2 The quenching oil pool 101 and the cold water pool 102 are both provided with a supporting edge 103 at the outer upper edge, and the processing box 100 is covered with a sealing cover 104, the sealing cover 104 is placed on the supporting edge 103, and the sealing cover 104 is provided with ventilation holes facing the quenching oil pool 101 and the cold water pool 102, and an exhaust pipe 105 is installed on the ventilation hole, the exhaust pipe 105 is externally connected to the exhaust fan, and the sealing cover 104 is hoisted by an assembly crane, the oil fume mixture generated in this embodiment is discharged through the fan and the exhaust pipe 105, and the sealing cover 104 is hoisted by the crane, thereby opening the processing box 100.

[0040] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A cold water treatment process for reducing the content of retained austenite in the internal structure of a bearing steel ball, characterized in that: Here are the steps: Step 1. Equipment preparation: Prepare the equipment required for cold water treatment; Step 2, heating: put the bearing steel ball into the heating furnace and heat it to the quenching temperature; Step 3, insulation: insulation at quenching temperature; Step 4: Quenching and cooling: quickly put the steel ball into a cold water pool for quenching and cooling; Step 5, low temperature treatment: the quenched steel ball is immediately placed in a low temperature cold water pool for cold treatment; Step 6, drying: After the bearing steel balls are cooled, quickly remove them and drain them, and pour the bearing steel balls into a vertical high-speed centrifugal dryer for dehydration; Step 7, tempering: the steel balls after cold water treatment are placed in a tempering furnace for tempering treatment; Step 8, Cooling: Keep warm at the tempering temperature to further stabilize the internal structure of the steel ball.

2. A device for performing the cold water treatment process according to claim 1, characterized in that: The invention comprises a processing box (100), wherein the processing box (100) is divided into a quenching oil pool (101) and a cold water pool (102) by a partition, wherein the quenching oil pool (101) performs the quenching cooling in step 4, and the cold water pool (102) performs the low temperature treatment in step 5.

3. The cold water treatment process device according to claim 2, characterized in that: The four corners of the upper surface of the processing box (100) are all clamped with fixing cards (2021), the outer side of the fixing card (2021) is provided with a connection hole, the inner thread of the connection hole is connected with a bolt, the end of the bolt abuts against the outer wall of the processing box (100), and the upper surface of the fixing card (2021) is welded with a column (202), the column (202) is movably sleeved with a crossbeam (201), a rack frame (200) is mounted between the crossbeams (201), a connecting frame (204) is slidably connected to the rack frame (200), a connecting plate (2042) is mounted at the end of the connecting frame (204), a winch (206) is mounted on the connecting plate (2042), a second driver (2061) is mounted at one end of the winch (206), a chain (2062) is wound around the winch (206), and a placement frame (207) is pulled at the tail of the chain (2062).

4. The cold water treatment process device according to claim 2, characterized in that: The upper surface of the rack frame plate (200) is provided with a protrusion, a receiving groove is provided in the protrusion, and saw teeth are equidistantly provided on one of the side walls in the length direction of the receiving groove. A first driver (205) is installed on the upper surface of the connecting frame (204), and the driving end of the first driver (205) passes through the connecting frame (204) and is connected to a gear (2051), and the gear (2051) is located in the receiving groove and meshes with the saw teeth.

5. The cold water treatment process device according to claim 4, characterized in that: A sliding groove is provided on the side of the rack frame plate (200), and pulleys (2041) are symmetrically provided on the lower surface of the connecting frame (204), wherein the pulleys (2041) are slidably connected in the sliding groove.

6. The cold water treatment process device according to claim 3, characterized in that: The connection plate (2042) is provided with a placement hole in the center, and the winch (206) is placed directly above the placement hole. The chain (2062) passes through the connection plate (2042) through the placement hole and extends into the processing box (100).

7. The cold water treatment process device according to claim 3, characterized in that: The front surface of the placement frame (207) is provided with a discharge port, and the discharge port is connected to a frame door (2071) via a hinge. A latch (2072) is provided at the edge of the frame door (2071), and the frame door (2071) is relatively fixed to the placement frame (207) via the latch (2072).

8. The cold water treatment process device according to claim 3, characterized in that: The column (202) is provided with a plurality of through holes at equal intervals, and the crossbeam (201) is provided with a plug hole corresponding to the socket connection with the column (202); a clamping plate (203) is provided on the side of the crossbeam (201) and outside the plug hole; a plug post (2031) is passed through the clamping plate (203); the plug post (2031) passes through the plug hole and the through hole in sequence to fix the crossbeam (201) on the column (202); a spring (2032) is sleeved on the plug post (2031); a protrusion is provided on the plug post (2031) to abut against one end of the spring (2032), and the other end of the spring (2032) abuts against the inner side of the clamping plate (203); the ends of the plug posts (2031) on the same crossbeam (201) are connected to a connecting rod (2033) through screws.

9. The cold water treatment process device according to claim 3, characterized in that: The height of the quenching oil pool (101) is higher than that of the cold water pool (102), and the columns (202) arranged at the four corners of the upper surface of the processing box (100) are respectively located at the outer ends of the quenching oil pool (101) and the cold water pool (102), and the upper surfaces of the columns (202) arranged on the quenching oil pool (101) and the cold water pool (102) are flush.

10. The cold water treatment process device according to claim 9, characterized in that: The quenching oil pool (101) and the cold water pool (102) are both provided with a supporting edge (103) at the outer upper edge, and the processing box (100) is covered with a sealing cover (104), the sealing cover (104) is placed on the supporting edge (103), and the sealing cover (104) is provided with ventilation holes at positions facing the quenching oil pool (101) and the cold water pool (102), and an exhaust pipe (105) is installed on the ventilation hole, the exhaust pipe (105) is externally connected to an exhaust fan, and the sealing cover (104) is hoisted by an assembly crane.

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