Surface carburizing treatment equipment for carbon steel self-tapping screw production

Abstract

The invention relates to the technical field of carburizing treatment, in particular to surface carburizing treatment equipment for carbon steel self-tapping screw production, which comprises a segmented carburizing treatment mechanism, the segmented carburizing treatment mechanism comprises a treatment box for carburizing treatment, and an electromagnetic heating coil for heating a screw is arranged in the treatment box. The tip end and the rod body of the screw are soaked in water, carburizing treatment is not conducted on the tip end and the rod body through separation of the water, a nut is heated through a first electromagnetic heating coil, then atmosphere is sprayed out of the nut, carburizing treatment is conducted on the nut, and after carburizing treatment of the nut is completed, the water soaking the rod body is pumped out. According to the technical scheme, the rod body is subjected to carburizing treatment, then the tip end is subjected to carburizing treatment in the same mode, different parts of the screw are effectively separated through water soaking, different temperatures and carburizing conditions can be set for each part, and therefore the performance requirements of different parts are better met.

Description

Technical Field

[0001] The invention relates to the technical field of carburizing treatment, in particular to surface carburizing treatment equipment used for the production of carbon steel self-tapping screws. Background Art

[0002] Carbon steel self-tapping screws are specially designed screws primarily for joining dissimilar materials. These screws feature a self-threading feature, with the tip designed to cut the corresponding thread as it is screwed into the material, eliminating the need for pre-drilling. This design significantly improves installation efficiency.

[0003] In the processing of carbon steel self-drilling screws, the surface needs to be carburized to enhance the hardness and wear resistance of the screws. Carburizing is a chemical heat treatment process. Specifically, the steel is placed in a carburizing medium, heated and kept warm, so that carbon atoms penetrate the surface of the steel, thereby increasing the carbon content of the steel surface and forming a certain carbon concentration gradient. For example, the surface carburizing treatment equipment for carbon steel self-drilling screws with application number CN202210896117.7 is a device for carburizing carbon steel self-drilling screws.

[0004] Most existing carburizing equipment directly heats the entire carbon steel self-tapping screw. Heating is crucial in carburizing. Heating increases the diffusion rate of carbon atoms and reduces activation energy, accelerating the penetration of carbon into the metal surface. Heating also improves the metal's permeability, loosening the lattice structure and forming a uniform carburized layer. Furthermore, the appropriate temperature and duration can control the depth and hardness of the carburized layer, improving the material's hardness and strength, ultimately achieving carburization success.

[0005] However, different parts of self-tapping screws have different functional requirements. For example, the screw head usually has to withstand torque. To avoid deformation during tightening, it requires a higher hardness, and the required heating temperature is 850℃-900℃. Although the function of the shank is different from that of the head, it must support the load applied by the head, so it must not only have sufficient hardness but also a certain degree of flexibility. The required heating temperature is 800℃-850℃. The tip part often needs to have a certain toughness to resist bending or tensile forces, and the required heating temperature is 780℃-840℃. Therefore, different parts of the screw need to be heated at different temperatures. The existing overall heating carburizing method may cause self-tapping screws to have problems such as uneven performance, deformation, cracks, and insufficient toughness after carburizing the screws. Summary of the Invention

[0006] In response to the above-mentioned shortcomings of the prior art, the present invention provides a surface carburizing treatment equipment for the production of carbon steel self-tapping screws, which can effectively solve the problems that the existing overall heating carburizing method in the prior art may cause the self-tapping screws to face uneven performance, deformation, cracks and insufficient toughness after carburizing the screws.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a surface carburizing treatment device for the production of carbon steel self-tapping screws, comprising:

[0009] A segmented carburizing treatment mechanism, the segmented carburizing treatment mechanism includes a treatment box for carburizing treatment, an electromagnetic heating coil for heating the screw is provided in the treatment box, the electromagnetic heating coil is divided into a first electromagnetic heating coil, a second electromagnetic heating coil, and a third electromagnetic heating coil, the first electromagnetic heating coil, the second electromagnetic heating coil, and the third electromagnetic heating coil are connected to the factory power through an electromagnetic controller, the segmented carburizing treatment mechanism also includes an atmosphere adaptive spraying component for spraying atmosphere onto the surface of the screw, the atmosphere adaptive spraying component includes a first vacuum pump and a second vacuum pump arranged inside the heating box for supplying atmosphere, the segmented carburizing treatment mechanism also includes a plurality of clamping detection components for fixing the clamping screws and detecting the diameter of the screws, and a separation component for separating the screws;

[0010] A staged carburizing treatment mechanism includes a partition fixedly connected in the treatment box and a placement plate slidably connected in the treatment box. The treatment box is divided into three carburizing spaces arranged in sequence up and down by the partition and the placement plate, and the three carburizing spaces are all provided with a thermometer and an atmosphere detection concentration meter. The thermometer, atmosphere detection concentration meter, electromagnetic heating coil, first vacuum pump, second vacuum pump are electrically connected to the PLC controller to form a staged treatment mechanism.

[0011] Preferably, the segmented carburizing treatment mechanism also includes two symmetrical electric telescopic rods fixedly connected to the top of the partition, the telescopic ends of the electric telescopic rods are fixedly connected to the placement plate, and the placement plate and the top of the partition are both provided with placement grooves of the same size, and the placement grooves are used to place screws.

[0012] Preferably, the lower outer side of the placement groove in the partition is connected to the third electromagnetic heating coil, the upper outer side of the placement groove in the partition is connected to the second electromagnetic heating coil, and the upper outer side of the placement groove in the placement plate is connected to the first electromagnetic heating coil.

[0013] Preferably, the atmosphere adaptive spray assembly also includes a sealing cover for sealing the processing box, the bottom end of the sealing cover is fixedly connected to a plurality of exhaust rings, and each exhaust ring corresponds to a placement groove, the bottom end of the exhaust ring is fixedly connected to a first booster nozzle arranged in a circumferential array, one of the exhaust rings is fixedly connected to an air intake pipe, the air intake end of the air intake pipe is airtightly plugged with a ventilation pipe, the outer wall of the processing box is fixedly connected to an atmosphere box, the top of the atmosphere box is fixedly connected to a first vacuum pump, and the exhaust end of the first vacuum pump is fixedly connected to the ventilation pipe.

[0014] Preferably, the interior of the partition is provided with two first exhaust spaces and second exhaust spaces arranged upper and lower, and a plurality of second boost nozzles are arranged in a circular array around the top of the partition and in each placement groove, and the second boost nozzle is connected to the first exhaust space, and a plurality of third boost nozzles are arranged in a circular array on the inner wall of the placement groove in the partition, and the third boost nozzle is connected to the second exhaust space, and the side wall of the atmosphere box is fixedly connected with a second air pump, the air inlet end of the second air pump is connected to the interior of the atmosphere box, and the air outlet end of the second air pump is fixedly connected with a diversion pipe, and the diversion pipe is fixedly connected with a first air inlet pipe and a second air inlet pipe which are respectively connected to the first exhaust space and the second exhaust space, and the first air inlet pipe and the second air inlet pipe are respectively provided with a first normally closed solenoid valve and a second normally closed solenoid valve, and the first normally closed solenoid valve and the second normally closed solenoid valve are electrically connected to the PLC controller.

[0015] Preferably, each group of the clamping detection components includes multiple groups of clamping rods slidably connected at the bottom end of the partition, wherein the side walls at both ends of one of the clamping rods are fixedly connected with a first tooth plate, and the tops at both ends of the other clamping rods are fixedly connected with a second tooth plate, the bottom end of the partition is fixedly connected with gears respectively meshing with the first tooth plate and the second tooth plate, the top of the partition is fixedly connected with a motor for driving the gears, and the opposite sides of the two clamping rods are respectively fixedly connected with an infrared transmitter and an infrared receiver, and the infrared transmitter and infrared receiver are electrically connected to the PLC controller.

[0016] Preferably, the staged carburizing treatment mechanism also includes an ultrasonic rangefinder fixedly connected to the bottom end of the sealing cover, the bottom end of the partition is fixedly connected to the thermometer, the top end of the partition is fixedly connected to the thermometer, the bottom end of the sealing cover is fixedly connected to a thermometer, the side wall of the treatment box is fixedly connected to an atmosphere detection concentration meter, and atmosphere detection concentration meters are arranged between the partition and the bottom of the treatment box, between the partition and the placement plate, and between the placement plate and the sealing cover. The atmosphere detection concentration meter, thermometer, ultrasonic rangefinder, and PLC controller are electrically connected.

[0017] Preferably, the partition assembly includes a water-cooling box fixedly connected to the outer wall of the processing box, a semiconductor refrigeration plate is embedded in the water-cooling box, a first water pump and a second water pump are fixedly connected to the side wall of the processing box, the water inlet end of the first water pump is connected to the water-cooling box, the discharge end of the first water pump is connected to the interior of the processing box, the water inlet end of the second water pump is connected to the interior of the processing box, a water temperature detector is fixedly connected at a lower position on the inner wall of the processing box, the discharge end of the second water pump is connected to the water-cooling box, the semiconductor refrigeration plate, the first water pump, the second water pump are electrically connected to the water temperature detector and the PLC control circuit to form a water cooling circuit.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] 1. The tip and the shaft of the screw are first soaked in water. The separation of water prevents the tip and the shaft from being carburized. The nut is heated by a first electromagnetic heating coil, and then the atmosphere is sprayed on the nut to perform carburizing. When the carburizing of the nut is completed, the water soaking the shaft is extracted, and then the shaft is carburized. Then, the tip is carburized in the same way. The different parts of the screw are effectively separated by water soaking, and different temperatures and carburizing conditions can be set for each part to better meet the performance requirements of different parts, thereby improving processing efficiency and product quality.

[0020] 2. As the carburizing process proceeds, after the initial stage, with the increase of carbon concentration and the saturation of surface active sites, the carburizing stage will slowly shift to the transition stage. Since the screw's absorption rate of the atmosphere slows down in the transition stage, the atmosphere in the treatment box will slowly accumulate. By detecting the atmosphere concentration in the treatment box with an atmosphere detection concentration meter, it can be known whether the carburizing treatment has entered the next stage. When entering the next stage, by reducing the atmosphere entering the treatment box and reducing the atmosphere concentration, the appropriate carbon transfer rate can be maintained to ensure the continuity of the carburizing process and prevent material performance degradation caused by excessive carburizing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

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

[0023] Figure 2 For the present invention Figure 1 The enlarged structural diagram of part B in the middle;

[0024] Figure 3 Schematic diagram of the internal three-dimensional structure of the present invention Figure 1 ;

[0025] Figure 4 It is a partial cross-sectional three-dimensional structural schematic diagram of the present invention;

[0026] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of part A;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the sealing cover of the present invention;

[0028] Figure 7 Schematic diagram of the internal three-dimensional structure of the present invention Figure 2 ;

[0029] Figure 8 For the present invention Figure 7 The enlarged structural diagram of part C in the middle;

[0030] Figure 9 It is a schematic diagram of the cross-sectional three-dimensional structure of the partition of the present invention.

[0031] Figures: 1, segmented carburizing treatment mechanism; 11, treatment box; 12, first electromagnetic heating coil; 13, second electromagnetic heating coil; 14, third electromagnetic heating coil; 15, atmosphere adaptive ejection assembly; 151, atmosphere box; 152, sealing cover; 153, exhaust ring; 154, first booster nozzle; 155, air inlet pipe; 156, vent pipe; 157, first air pump; 158, first exhaust space; 159, second exhaust space; 1510, second booster nozzle; 1511, third booster nozzle; 1512, second air pump; 1513, diverter pipe; 1514, first air inlet pipe; 151 5. Second air inlet pipe; 16. Clamping detection assembly; 161. Clamping rod; 162. First gear plate; 163. Second gear plate; 164. Gear; 165. Motor; 166. Infrared transmitter; 167. Infrared receiver; 17. Partition assembly; 171. Water cooling box; 172. Semiconductor refrigeration plate; 173. First water pump; 174. Second water pump; 175. Water temperature detector; 18. Partition; 19. Electric telescopic rod; 110. Placement plate; 111. Placement slot; 2. Staged carburizing treatment mechanism; 21. Thermometer; 22. Atmosphere detection concentration meter; 23. Ultrasonic rangefinder; 3. Screws. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] The present invention will be further described below with reference to the embodiments.

[0034] Example: Refer to Figures 1 to 9 , a surface carburizing treatment equipment for the production of carbon steel self-tapping screws, comprising:

[0035] The screw 3 can be heated and carburized in sections by the following specific structure. Figures 1 to 9 , a segmented carburizing treatment mechanism 1, the segmented carburizing treatment mechanism 1 includes a treatment box 11 for carburizing treatment, an electromagnetic heating coil for heating the screw 3 is provided in the treatment box 11, and the electromagnetic heating coil is divided into a first electromagnetic heating coil 12, a second electromagnetic heating coil 13, and a third electromagnetic heating coil 14. The first electromagnetic heating coil 12, the second electromagnetic heating coil 13, and the third electromagnetic heating coil 14 are connected to the factory power through an electromagnetic controller. The segmented carburizing treatment mechanism 1 also includes an atmosphere adaptive spraying component 15 for spraying atmosphere onto the surface of the screw 3. The atmosphere adaptive spraying component 15 includes a first vacuum pump 157 and a second vacuum pump 1512 arranged inside the heating box for supplying atmosphere. The segmented carburizing treatment mechanism 1 also includes a plurality of clamping detection components 16 for fixing and clamping the screw 3 and detecting the diameter of the screw 3, and a separation component 17 for separating the screw 3;

[0036] The segmented carburizing treatment mechanism 1 also includes a partition 18 fixedly connected in the treatment box 11, and two symmetrical electric telescopic rods 19 are fixedly connected to the top of the partition 18. The top of the electric telescopic rod 19 is fixedly connected to a placement plate 110 that is airtightly slidably connected to the inner wall of the treatment box 11. The placement plate 110 and the top of the partition 18 are both provided with placement grooves 111 of the same size, and the placement grooves 111 are used to place screws 3.

[0037] The screw 3 can be segmented by the following specific structure, refer to Figures 1 to 3The partition assembly 17 includes a water-cooling box 171 fixedly connected to the outer wall of the treatment box 11, a semiconductor refrigeration plate 172 is embedded in the water-cooling box 171, a first water pump 173 and a second water pump 174 are fixedly connected to the side wall of the treatment box 11, the water inlet end of the first water pump 173 is connected to the water-cooling box 171, the discharge end of the first water pump 173 is connected to the interior of the treatment box 11, the water inlet end of the second water pump 174 is connected to the interior of the treatment box 11, a water temperature detector 175 is fixedly connected to the lower position of the inner wall of the treatment box 11, the discharge end of the second water pump 174 is connected to the water-cooling box 171, the semiconductor refrigeration plate 172, the first water pump 17 3. The second water pump 174 is electrically connected to the water temperature detector 175 to form a water cooling circuit. The first water pump 173 is set in advance to inject the water in the water cooling box 171 into the processing box 11. The cooled water is just at the same level as the upper surface of the placement plate 110. The reason is to prevent carburization of the tip of the screw 3 and the rod body. The second water pump 174 is pre-set to have a first water pumping volume that can just pump the water in the processing box 11 to be consistent with the upper surface of the partition 18. The reason is that carburization needs to be performed on the rod body but not on the tip. The first water pump 173 and the second water pump 174 are electrically connected to the PLC controller.

[0038] The screw 3 is heated in sections by the following specific structure, refer to Figure 3 The lower outer side of the placement groove 111 in the partition 18 is connected to the third electromagnetic heating coil 14, the upper outer side of the placement groove 111 in the partition 18 is connected to the second electromagnetic heating coil 13, and the upper outer side of the placement groove 111 in the placement plate 110 is connected to the first electromagnetic heating coil 12;

[0039] The third electromagnetic heating coil 14 is used to heat the tip of the bottom of the screw 3, so the diameter of the third electromagnetic heating coil 14 only needs to be larger than the diameter of the placement slot 111. The second electromagnetic heating coil 13 is used to heat the shaft of the screw 3, and the diameter of the shaft is larger than that of the tip, so the diameter of the second electromagnetic heating coil 13 is larger than the diameter of the third electromagnetic heating coil 14. The first electromagnetic heating coil 12 is used to heat the nut of the screw 3, and the diameter of the nut is larger than the diameter of the shaft, so the diameter of the first electromagnetic heating coil 12 is larger than the diameter of the second electromagnetic heating coil 13.

[0040] The screw 3 can be carburized by the following specific structure, refer to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 9The atmosphere adaptive spraying assembly 15 also includes a sealing cover 152 for sealing the processing box 11. The bottom end of the sealing cover 152 is fixedly connected to a plurality of exhaust rings 153, and each exhaust ring 153 corresponds to the placement groove 111. The bottom end of the exhaust ring 153 is fixedly connected to a first booster nozzle 154 arranged in a circumferential array. One of the exhaust rings 153 is fixedly connected to an air intake pipe 155, and the air inlet end of the air intake pipe 155 is airtightly plugged with a ventilation pipe 156. The outer wall of the processing box 11 is fixedly connected to the atmosphere box 151, and the top of the atmosphere box 151 is fixedly connected to a first air pump 157. The exhaust end of the first air pump 157 is fixedly connected to the ventilation pipe 156, wherein the atmosphere is one or more of carbon dioxide, ammonia, acetylene, and methane.

[0041] Among them, the interior of the partition 18 is provided with two first exhaust spaces 158 and a second exhaust space 159 arranged up and down. The top of the partition 18 is located in a plurality of second booster nozzles 1510 arranged in a circular array around each placement groove 111, and the second booster nozzle 1510 is connected to the first exhaust space 158. The inner wall of the placement groove 111 in the partition 18 is provided with a plurality of third booster nozzles 1511 in a circular array, and the third booster nozzle 1511 is connected to the second exhaust space 159. The side wall of the atmosphere box 151 is fixedly connected to a second air pump 1512, the air inlet end of the second air pump 1512 is connected with the interior of the atmosphere box 151, and the air exhaust end of the second air pump 1512 is fixedly connected with a diversion pipe 1513, and the diversion pipe 1513 is fixedly connected with a first air inlet pipe 1514 and a second air inlet pipe 1515 which are respectively connected with the first exhaust space 158 and the second exhaust space 159, and the first air inlet pipe 1514 and the second air inlet pipe 1515 are respectively provided with a first normally closed solenoid valve and a second normally closed solenoid valve, and the first normally closed solenoid valve and the second normally closed solenoid valve are connected with the PLC controller electrical signal.

[0042] The screw 3 is clamped and its diameter is detected by the following specific structure, refer to Figure 7 、 Figure 8 Each group of clamping detection components 16 includes multiple groups of clamping rods 161 slidably connected to the bottom end of the partition 18, wherein the side walls at both ends of one clamping rod 161 are fixedly connected to a first tooth plate 162, and the tops at both ends of the other clamping rod 161 are fixedly connected to a second tooth plate 163, and the bottom end of the partition 18 is fixedly connected to a gear 164 respectively meshing with the first tooth plate 162 and the second tooth plate 163, and the top of the partition 18 is fixedly connected to a motor 165 for driving the gear 164, and the opposite sides of the two clamping rods 161 are respectively fixedly connected to an infrared transmitter 166 and an infrared receiver 167, and the infrared transmitter 166 and the infrared receiver 167 are electrically connected to the PLC controller.

[0043] The screw 3 is carburized in stages by the following specific structure, refer to Figure 6 , a staged carburizing treatment mechanism 2, the staged carburizing treatment mechanism 2 includes a partition 18 fixedly connected in the treatment box 11 and a placement plate 110 slidably connected in the treatment box 11, and the treatment box 11 is divided into three carburizing spaces arranged in sequence up and down by the partition 18 and the placement plate 110, and the three carburizing spaces are all provided with a thermometer 21 and an atmosphere detection concentration meter 22, the thermometer 21, the atmosphere detection concentration meter 22, the electromagnetic heating coil, the first vacuum pump 157, the second vacuum pump 1512 and the PLC controller are electrically connected to form a staged treatment mechanism, wherein the three carburizing spaces are formed from top to bottom by the top of the treatment box 11 and the placement plate 110 to form a first carburizing space, the partition 18 and the placement plate 110 to form a second carburizing space, and the partition 18 and the bottom of the treatment box to form a third carburizing space.

[0044] Among them, the staged carburizing treatment mechanism 2 also includes an ultrasonic rangefinder 23 fixedly connected to the bottom end of the sealing cover 152, the bottom end of the partition 18 is fixedly connected to the thermometer 21, and the top end of the partition 18 is fixedly connected to the thermometer 21. The bottom end of the sealing cover 152 is fixedly connected with the thermometer 21, and the side wall of the processing box 11 is fixedly connected to the atmosphere detection concentration meter 22. An atmosphere detection concentration meter 22 is arranged between the partition 18 and the bottom of the processing box 11, between the partition 18 and the placement plate 110, and between the placement plate 110 and the sealing cover 152. The atmosphere detection concentration meter 22, the thermometer 21, the ultrasonic rangefinder 23, and the PLC controller are electrically connected.

[0045] The working principle of the present invention is as follows:

[0046] First place the screw 3 in the placement groove 111, then put the sealing cover 152 on the processing box 11, and at the same time, the air inlet pipe 155 needs to be connected with the ventilation pipe 156, and then use external sealing technology, such as applying wax at the connection between the sealing cover 152 and the processing box 11 to further seal it.

[0047] Then the screw 3 is heated and then carburized. The specific process is as follows:

[0048] The electric telescopic rod 19 is activated by the PLC controller, and the placement plate 110 is driven downward by the electric telescopic rod 19. The screw 3 will fall synchronously due to its own gravity. The falling distance is known by the ultrasonic rangefinder 23 that monitors the nut height in real time. When the nut height detection detects that the nut position is not moving (so that the lower surface of the nut does not contact the placement plate 110 and does not affect the carburizing treatment of the nut), it means that the bottom end of the screw 3 has bottomed out, and then the electric telescopic rod 19 is controlled by the PLC controller to stop extending and retracting.

[0049] Then, the uncooled water in the water cooling box 171 is discharged into the treatment box 11 by controlling the first water pump 173, so that the water submerges the tip and the shaft of the screw 3 so that the carburizing treatment cannot be performed.

[0050] Then, the control motor 165 is started by the PLC controller, and the motor 165 drives the gear 164 to rotate, and the gear 164 drives the first tooth plate 162 and the second tooth plate 163 to move toward the gear 164, thereby driving the clamping rod 161 to clamp the screw 3. The diameter of the screw 3 can be obtained through the infrared transmitter 166, the infrared receiver 167 and the data processing module in the PLC control, and the model of the screw 3 can be determined based on the diameter of the screw 3 (the diameters corresponding to different types of screws 3 are set in the PLC controller in advance);

[0051] Then, the PLC controller controls the current flowing into the first electromagnetic heating coil 12 according to the type of the screw, so that the nut is heated to 850°C-900°C. When the temperature of the nut reaches 850°C-900°C, the thermometer 21 controls the first electromagnetic heating coil 12 to heat the nut at a low power to keep the nut at 850°C-900°C.

[0052] Then, by controlling the first vacuum pump 157, the atmosphere is supplied to the air inlet pipe 155, and then sprayed on the rod body and the nut respectively through the first boost nozzle 154, so that the nut is carburized. The power of the first vacuum pump 157 is adaptively adjusted according to the size of the nut by the PLC controller;

[0053] Generally, the carburizing treatment of screw 3 is divided into four stages, which are respectively divided into the initial stage, the transition stage, the stabilization stage, and the cooling post-treatment stage. Each stage has different characteristics as follows: Initial stage: In the initial stage of carburizing, due to the higher temperature and concentration of the atmosphere, the adsorption rate of carbon by screw 3 is higher, and the adsorption amount increases rapidly (rapid adsorption); Transition stage: As time goes by, the concentration of the atmosphere on the surface of screw 3 begins to increase, and the adsorption rate gradually slows down. Although there will still be continuous adsorption of carbon, the adsorption effect begins to decline significantly due to the reduction of active sites available for adsorption (slowing of the adsorption rate); Stabilization stage: In this stage, a dynamic balance is reached between adsorption and diffusion. The concentration of the atmosphere is relatively stable on the surface of screw 3 and inside screw 3. Although adsorption and dissolution will still occur during this process, the adsorbed carbon may penetrate more into the metal instead of continuing to be adsorbed on the surface (dynamic balance);

[0054] In this case, the amount of atmosphere discharged into the processing box 11 by the first vacuum pump 157 in the initial stage is xL / min, the amount of atmosphere discharged into the processing box 11 in the transition stage is yL / min, and the amount of atmosphere discharged into the processing box 11 in the stable stage is zL / min.

[0055] The concentration of the atmosphere is monitored in real time by the atmosphere detection concentration meter 22. Since carburizing is a continuous process, the atmosphere is provided to the processing box 11 for a long time. Since the speed of adsorption of the atmosphere is relatively fast in the initial stage of carburizing, the amount of atmosphere discharged into the processing box 11 by the first air pump 157 at xL / min will be quickly consumed. However, it will slowly enter a transition stage with the passage of time. In this stage, the adsorption rate will slow down, but the atmosphere will still be provided at the initial stage, which will cause the atmosphere to accumulate in the processing box 11. When the increase in the amount of atmosphere is detected by the atmosphere detection concentration meter 22, it means that the carburizing process has entered a transition stage. Therefore, it is necessary to control the amount of atmosphere discharged into the processing box 11 by the first air pump 157 to be μL / min by the PLC controller to prevent excessive accumulation in the processing box 11. As the carburizing process proceeds, the carburizing process will slowly enter a stable stage, in which a dynamic equilibrium will be reached. Therefore, it will be further slowed down in this stage. It is necessary to further control the first air pump 157 by the PCL controller to discharge the atmosphere into the processing box 11 at μL / min for carburizing.

[0056] According to the pre-tested carburizing treatment time of the nut of the screw 3, when the time is about to be reached, the second water pump 174 is controlled by the PLC controller to start to pump out the water in the treatment box 11 for the first time, and then the pumped water is cooled by the semiconductor cooling plate 172 for subsequent use;

[0057] Then, the heat is transferred to the rod body through heat conduction by the screw 3, and the rod body is preheated to dry the water on the rod body. When the carburizing treatment of the nut of the screw 3 reaches the preset time, the second electromagnetic heating coil 13 is energized, the first electromagnetic heating coil 12 is de-energized, the first air pump 157 is stopped, and the second air pump 1512 is started. At the same time, the first normally closed electromagnetic valve is opened, so that the atmosphere is sprayed onto the rod body through the second boost nozzle 1510 to perform carburizing treatment on the rod body. The remaining steps are the same as those for the carburizing treatment of the nut.

[0058] When carburizing of the rod body is completed, the second water pump 174 is started by the PLC controller to extract the water in the treatment box 11 for the second time, so that the tip of the screw 3 leaks out. Then the first normally closed solenoid valve is closed and the second normally closed solenoid valve is opened by the PLC controller, so that the atmosphere is sprayed on the rod body through the third boost nozzle 1511 to perform carburizing treatment on the tip. The carburizing treatment at the tip is consistent with the carburizing treatment process of the nut.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A surface carburizing treatment equipment for the production of carbon steel self-tapping screws, characterized in that: include: A segmented carburizing treatment mechanism (1), the segmented carburizing treatment mechanism (1) comprising a treatment box (11) for carburizing treatment, wherein an electromagnetic heating coil for heating a screw (3) is arranged in the treatment box (11), wherein the electromagnetic heating coil is divided into a first electromagnetic heating coil (12), a second electromagnetic heating coil (13), and a third electromagnetic heating coil (14), wherein the first electromagnetic heating coil (12), the second electromagnetic heating coil (13), and the third electromagnetic heating coil (14) are connected to a factory power supply via an electromagnetic controller, wherein the segmented carburizing treatment mechanism (1) also comprises an atmosphere adaptive spraying component (15) for spraying atmosphere onto the surface of the screw (3), wherein the atmosphere adaptive spraying component (15) comprises a first vacuum pump (157) and a second vacuum pump (1512) arranged inside the heating box for supplying atmosphere, wherein the segmented carburizing treatment mechanism (1) also comprises a plurality of clamping detection components (16) for fixing and clamping the screw (3) and detecting the diameter of the screw (3), and a separation component (17) for separating the screw (3); A staged carburizing treatment mechanism (2), the staged carburizing treatment mechanism (2) comprising a partition (18) fixedly connected in a treatment box (11) and a placement plate (110) slidably connected in the treatment box (11), the treatment box (11) is divided into three carburizing spaces arranged in sequence up and down by the partition (18) and the placement plate (110), and the three carburizing spaces are each provided with a temperature measuring instrument (21) and an atmosphere detection concentration meter (22), the temperature measuring instrument (21), the atmosphere detection concentration meter (22), the electromagnetic heating coil, the first vacuum pump (157), and the second vacuum pump (1512) are electrically connected to a PLC controller to form a staged treatment mechanism.

2. The surface carburizing treatment equipment for the production of carbon steel self-tapping screws according to claim 1 is characterized in that: The segmented carburizing treatment mechanism (1) also includes two symmetrical electric telescopic rods (19) fixedly connected to the top of the partition (18), the telescopic ends of the electric telescopic rods (19) are fixedly connected to the placement plate (110), and the tops of the placement plate (110) and the partition (18) are both provided with placement grooves (111) of the same size, and the placement grooves (111) are used to place the screws (3).

3. The surface carburizing treatment equipment for the production of carbon steel self-tapping screws according to claim 2 is characterized in that: The lower outer side of the placement groove (111) in the partition (18) is connected to the third electromagnetic heating coil (14), the upper outer side of the placement groove (111) in the partition (18) is connected to the second electromagnetic heating coil (13), and the upper outer side of the placement groove (111) in the placement plate (110) is connected to the first electromagnetic heating coil (12).

4. The surface carburizing treatment equipment for the production of carbon steel self-tapping screws according to claim 3 is characterized in that: The atmosphere adaptive spraying assembly (15) also includes a sealing cover (152) for sealing the processing box (11); the bottom end of the sealing cover (152) is fixedly connected to a plurality of exhaust rings (153), and each exhaust ring (153) corresponds to the placement groove (111); the bottom end of the exhaust ring (153) is fixedly connected to a first booster nozzle (154) arranged in a circumferential array; one of the exhaust rings (153) is fixedly connected to an air intake pipe (155); the air intake end of the air intake pipe (155) is airtightly plugged with a ventilation pipe (156); the outer wall of the processing box (11) is fixedly connected to the atmosphere box (151); the top end of the atmosphere box (151) is fixedly connected to a first vacuum pump (157); the exhaust end of the first vacuum pump (157) is fixedly connected to the ventilation pipe (156).

5. The surface carburizing treatment equipment for the production of carbon steel self-tapping screws according to claim 4, characterized in that: The interior of the partition (18) is provided with two first exhaust spaces (158) and a second exhaust space (159) arranged in an upper and lower manner. A plurality of second booster nozzles (1510) are arranged in a circular array around each placement groove (111) at the top of the partition (18), and the second booster nozzles (1510) are connected to the first exhaust space (158). A plurality of third booster nozzles (1511) are arranged in a circular array on the inner wall of the placement groove (111) in the partition (18), and the third booster nozzles (1511) are connected to the second exhaust space (159). The side wall of the atmosphere box (151) is fixedly connected to a second exhaust nozzle. Pump (1512), the air inlet end of the second vacuum pump (1512) is connected to the inside of the atmosphere box (151), the air outlet end of the second vacuum pump (1512) is fixedly connected to a shunt pipe (1513), the shunt pipe (1513) is fixedly connected to a first air inlet pipe (1514) and a second air inlet pipe (1515) which are respectively connected to the first exhaust space (158) and the second exhaust space (159), and the first air inlet pipe (1514) and the second air inlet pipe (1515) are respectively provided with a first normally closed solenoid valve and a second normally closed solenoid valve, and the first normally closed solenoid valve and the second normally closed solenoid valve are connected to the PLC controller via electrical signals.

6. The surface carburizing treatment equipment for the production of carbon steel self-tapping screws according to claim 1, characterized in that: Each group of the clamping detection components (16) includes a plurality of groups of clamping rods (161) slidably connected to the bottom end of the partition (18), wherein the side walls at both ends of one of the clamping rods (161) are fixedly connected to a first tooth plate (162), and the tops at both ends of the other clamping rod (161) are fixedly connected to a second tooth plate (163), the bottom end of the partition (18) is fixedly connected to a gear (164) respectively meshing with the first tooth plate (162) and the second tooth plate (163), the top of the partition (18) is fixedly connected to a motor (165) for driving the gear (164), and the opposite sides of the two clamping rods (161) are fixedly connected to an infrared transmitter (166) and an infrared receiver (167), respectively, and the infrared transmitter (166) and the infrared receiver (167) are connected to the PLC controller via electrical signals.

7. The surface carburizing treatment equipment for the production of carbon steel self-tapping screws according to claim 6, characterized in that: The staged carburizing treatment mechanism (2) further comprises an ultrasonic rangefinder (23) fixedly connected to the bottom end of the sealing cover (152); the bottom end of the partition (18) is fixedly connected to the thermometer (21); the top end of the partition (18) is fixedly connected to the thermometer (21); the bottom end of the sealing cover (152) is fixedly connected to the thermometer (21); the side wall of the treatment box (11) is fixedly connected to the atmosphere detection concentration meter (22); and atmosphere detection concentration meters (22) are arranged between the partition (18) and the bottom of the treatment box (11), between the partition (18) and the placement plate (110), and between the placement plate (110) and the sealing cover (152); the atmosphere detection concentration meter (22), the thermometer (21), and the ultrasonic rangefinder (23) are connected to the PLC controller in electrical signal connection.

8. The surface carburizing treatment equipment for the production of carbon steel self-tapping screws according to claim 1, characterized in that: The partition assembly (17) comprises a water cooling box (171) fixedly connected to the outer wall of the processing box (11), a semiconductor refrigeration plate (172) being embedded in the water cooling box (171), a first water pump (173) and a second water pump (174) being fixedly connected to the side wall of the processing box (11), a water inlet end of the first water pump (173) being connected to the water cooling box (171), and a water discharge end of the first water pump (173) being connected to the interior of the processing box (11). The water inlet end of the second water pump (174) is connected to the interior of the processing box (11), a water temperature detector (175) is fixedly connected to the lower position of the inner wall of the processing box (11), the discharge end of the second water pump (174) is connected to the water cooling box (171), and the semiconductor refrigeration plate (172), the first water pump (173), the second water pump (174) are connected to the water temperature detector (175), and the PLC control circuit electrical signal to form a water cooling circuit.

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