Equipment and method for manufacturing bearing ring blanks

Abstract

The present invention discloses a device for manufacturing a bearing ring blank, which comprises an automatic cutting device, an automatic feeding device, a heating device, an automatic conveying device, a ring rolling machine and an automatic conveying device; the automatic feeding device is arranged below the automatic cutting device, and is used to convey a short section of a steel pipe to the heating device; a feeding channel is arranged at the top of the heating device, and a discharging channel is arranged at the bottom of the heating device, and the heated short section of the steel pipe is discharged from the discharging channel; the discharging channel is provided with a discharging port, and the automatic conveying device is arranged near the discharging port, and is used to convey the heated short section of the steel pipe discharged from the discharging channel to the ring rolling machine to obtain a bearing ring blank preform; the automatic conveying device has a spray cooling device, and the spray cooling device is used to cool the bearing ring blank preform to obtain a bearing ring blank. The processing efficiency of the device is high, and no network carbide is formed on the surface of the obtained bearing ring blank. The present invention also discloses a method for manufacturing a bearing ring blank.

Description

Technical Field

[0001] The invention relates to a device and a method for manufacturing a bearing ring blank, and in particular to a device and a method for manufacturing a bearing ring blank by using a seamless steel pipe. Background Art

[0002] Bearings are an important component in modern mechanical equipment. Their main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Bearing rings are an important component of bearings.

[0003] CN102267040B discloses a method for preparing a stainless steel bearing ring, which includes the following steps: heating and perforating a round bar to obtain a tube blank; isothermally annealing the tube blank, and then rolling it into a bearing steel tube of a specified size; annealing the rolled bearing steel tube, and then cutting it to obtain a bearing ring. This method requires multiple heating and cooling, consumes a lot of energy, and a network of carbides will be produced on the surface of the bearing ring. In addition, the patent document does not involve equipment for manufacturing bearing ring blanks.

[0004] CN101718305B discloses a method for manufacturing a bearing ring and a bearing ring blank manufacturing device. The method comprises the following steps: sawing a bar material to a specified size, feeding it into a heating device to make the temperature reach a predetermined value, feeding it into a punching machine to form a rough pipe, then cooling the rough pipe, randomly transferring it into a ring-rolling and cutting bearing ring blank manufacturing device, and continuously processing the bearing ring blank through the ring-rolling and cutting device provided in the ring-rolling and cutting bearing ring blank manufacturing device. The patent also provides a bearing ring blank manufacturing device for manufacturing a bearing ring, comprising a bar material sawing machine, a heating device and a punching machine arranged in sequence, and a temperature control device, a ring-rolling and cutting bearing ring blank manufacturing device and a shot peening device are provided after the punching machine. The method requires a complicated shot peening process, and the bearing ring blank manufacturing equipment used has a low degree of automation.

[0005] CN108145048A discloses a bearing ring CNC ring rolling automatic forming process, comprising the following steps: (1) sawing a bar material to a specified size by a bearing ring blank manufacturing device; (2) inputting the cut bar material into a heating furnace and heating it to a predetermined value; (3) outputting the heated bar material from the heating furnace and sending it into a punching machine for perforation to form a rough pipe; (4) inputting the rough pipe into a forming channel of a bearing ring CNC ring rolling forming bearing ring blank manufacturing device; (5) the rough pipe placed in the forming channel is driven by the rotation of a forming component of the bearing ring CNC ring rolling forming bearing ring blank manufacturing device to automatically drive at a constant speed, and during the transmission process, the rough pipe is synchronously realized by the forming component to perform preliminary ring rolling and cutting on the rough pipe, so that it is equally divided into a number of bearing ring forming rings; (6) the bearing ring forming ring is subjected to secondary ring rolling and cutting into a bearing ring blank, and driven by the rotation of the forming component to output it from the output end of the forming channel. This method requires secondary ring rolling and cutting, and the process is relatively complicated. Summary of the invention

[0006] In view of this, on the one hand, the present invention provides an apparatus for manufacturing a bearing ring blank, the apparatus has high processing efficiency, and no network carbide is formed on the surface of the obtained bearing ring blank. On the other hand, the present invention provides a method for manufacturing a bearing ring blank, the method saves energy, and no network carbide is formed on the surface of the obtained bearing ring blank.

[0007] The above technical problem is achieved through the following technical solution.

[0008] On the one hand, the present invention provides an apparatus for manufacturing a bearing ring blank, characterized in that it comprises: an automatic cutting device, an automatic feeding device, a heating device, an automatic conveying device, a ring rolling machine and an automatic conveying device;

[0009] The automatic cutting device is used to cut the hot-rolled thick-walled seamless steel pipe into steel pipe short sections;

[0010] The automatic feeding device is arranged below the automatic cutting device and is used to transport the short section of the steel pipe to the heating device;

[0011] The heating device is arranged below the automatic feeding device, and is used to heat the steel pipe short section to a specified temperature; a feeding channel is arranged on the top of the heating device, and the steel pipe short section enters the heating device through the feeding channel; a discharging channel is arranged at the bottom of the heating device, and the discharging channel is provided with a discharging port, and the heated steel pipe short section is discharged from the discharging port;

[0012] The automatic conveying device is arranged near the discharge port of the discharge channel, and is used to convey the heated steel pipe short section discharged from the discharge channel to the ring rolling machine;

[0013] The ring rolling machine is used to roll the heated steel pipe short section conveyed by the automatic conveying device into a bearing ring blank preform;

[0014] The automatic conveying device has a spray cooling device, and the automatic conveying device is used to convey the bearing ring blank pre-product to the cooling range of the spray cooling device; the spray cooling device is used to cool the bearing ring blank pre-product to obtain the bearing ring blank.

[0015] According to the device of the present invention, preferably, the automatic feeding device comprises a feeding conveyor belt and an automatic loader;

[0016] The feeding conveyor belt is arranged below the automatic cutting device and is used to transport the short section of the steel pipe to the automatic feeding machine;

[0017] The automatic loader is arranged below the feeding conveyor belt, and is used for receiving the steel pipe short section conveyed by the feeding conveyor belt, and supplying the steel pipe short section to the heating device.

[0018] According to the equipment of the present invention, preferably, the discharge channel is provided with a first discharge port and a second discharge port; the automatic conveying device includes two groups, namely, a first automatic conveying device and a second automatic conveying device; the ring rolling machine includes two groups, namely, a first ring rolling machine and a second ring rolling machine;

[0019] The first automatic conveying device is used to convey the steel pipe short section discharged from the first discharge port to the first ring rolling machine;

[0020] The first ring rolling machine is used to roll the steel pipe short section conveyed by the first automatic conveying device into a bearing ring blank preform;

[0021] The second automatic conveying device is used to convey the steel pipe short section discharged from the second discharge port to the second ring rolling machine;

[0022] The second ring rolling machine is used to roll the steel pipe short section conveyed by the second automatic conveying device into a bearing ring blank preform.

[0023] According to the device of the present invention, preferably, the discharge channel is arched, and the first discharge port and the second discharge port are respectively arranged at two ends of the discharge channel.

[0024] According to the equipment of the present invention, preferably, the equipment also includes an automatic loading platform, which is arranged above the automatic cutting device and inclined downward to the cutting part of the automatic cutting device, and is used to supply hot-rolled thick-walled seamless steel pipes to the automatic cutting device.

[0025] According to the device of the present invention, preferably, the device further comprises a palletizing robot and a palletizing collector;

[0026] The palletizing robot is used to transfer the bearing ring blanks on the automatic conveying device to the palletizing collector;

[0027] The stacking collector is used to collect bearing ring blanks.

[0028] According to the equipment of the present invention, preferably, the automatic cutting device is a CNC circular saw, the heating device is a medium frequency heating furnace, and the automatic conveying device is a robotic arm.

[0029] According to the device of the present invention, preferably, the automatic conveying device comprises a first discharge conveyor belt, a second discharge conveyor belt and a conveyor belt; the stacking collector is arranged at one end of the conveyor belt, and the nozzle of the spray cooling device is arranged above the conveyor belt;

[0030] The first ring rolling machine is provided with a discharge port, and the first discharge conveyor belt is arranged near the discharge port of the first ring rolling machine, and is used to convey the bearing ring blank preform formed by the first ring rolling machine to the conveyor belt;

[0031] The second ring rolling machine is provided with a discharge port, and the second discharge conveyor belt is arranged near the discharge port of the second ring rolling machine, and is used to convey the bearing ring blank preform formed by the second ring rolling machine to the conveyor belt;

[0032] The conveyor belts are respectively connected to the first discharge conveyor belt and the second discharge conveyor belt. The bearing ring blank preform is cooled by a spray cooling device on the conveyor belt to form a bearing ring blank. The bearing ring blank is transported by the conveyor belt to an area where a palletizing robot can pick it up, and then transferred to a palletizing collector by the palletizing robot.

[0033] On the other hand, the present invention provides a method for manufacturing a bearing ring blank, using the above-mentioned device, comprising the following steps:

[0034] (1) a hot-rolled thick-walled seamless steel pipe is cut into steel pipe short sections by an automatic cutting device, wherein the hot-rolled thick-walled seamless steel pipe is formed of GCr15 bearing steel;

[0035] (2) The steel pipe short section enters the heating device through the automatic feeding device for heating to obtain a heated steel pipe short section; the preheating temperature of the heating device is controlled to be 400-700°C and the heating temperature is 800-1200°C;

[0036] (3) The heated steel pipe short section is transported to the ring rolling machine through an automatic conveying device and rolled into a bearing ring blank preform;

[0037] (4) The bearing ring blank preform enters the automatic conveying device and is cooled by the spray cooling device of the automatic conveying device, and the temperature is reduced to 150-250° C. at a cooling rate of 55-80° C. / h to obtain the bearing ring blank.

[0038] According to the method of the present invention, preferably, in step (1), the length of the steel pipe short section is 10 to 40 mm; and in step (3), the ring rolling machine is set to have a rolling ratio of not less than 1.3.

[0039] The equipment of the present invention has a high degree of automation in the process of manufacturing the bearing ring blank, and no manual operation is required. Only one step of heating and cooling is required, and energy consumption is low. A spray device is used for cooling, and the cooling speed is fast, and no network carbide is formed on the surface of the obtained bearing ring blank. The method of the present invention further limits the heating temperature and the cooling rate, which is conducive to ensuring the quality of the bearing ring blank and ensuring that no network carbide is formed on the surface of the bearing ring blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The invention discloses a device for manufacturing a bearing ring blank.

[0041] Figure 2 The invention discloses another device for manufacturing a bearing ring blank.

[0042] The reference numerals are as follows:

[0043] 100-automatic loading platform; 1-first automatic loading platform; 2-second automatic loading platform; 200-automatic cutting device; 3-first automatic cutting device; 4-second automatic cutting device; 300-automatic feeding device; 5-feeding conveyor belt; 6-automatic feeding machine; 7-feeding channel; 8-heating device; 9-discharging channel; 500-ring rolling machine; 10-first ring rolling machine; 11-second ring rolling machine; 400-automatic conveying device; 12-first automatic conveying device; 13-second automatic conveying device; 600-automatic transporting device; 700-discharging conveyor belt; 14-first discharging conveyor belt; 15-second discharging conveyor belt; 16-conveyor belt; 17-spray cooling equipment; 18-palletizing robot; 19-palletizing collector. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0045] <Equipment for manufacturing bearing ring blanks>

[0046] The equipment for manufacturing bearing ring blanks of the present invention comprises: an automatic cutting device, an automatic feeding device, a heating device, an automatic conveying device, a ring rolling machine and an automatic conveying device. Optionally, the equipment of the present invention may also comprise one or more of an automatic loading platform, a stacking robot and a stacking collector.

[0047] Automatic cutting device

[0048] The automatic cutting device of the present invention is used to cut hot-rolled thick-walled seamless steel pipes into short sections of steel pipes. The automatic cutting device of the present invention can be set as one group or as multiple groups. For example, two groups, namely a first automatic cutting device and a second automatic cutting device. A feed port is provided at the top of the automatic cutting device, and a discharge port is provided at the bottom of the automatic cutting device. The hot-rolled thick-walled seamless steel pipe enters from the feed port of the automatic cutting device, and the automatic cutting device cuts the hot-rolled thick-walled seamless steel pipe into short sections of steel pipes, and the short sections of steel pipes are discharged from the discharge port of the automatic cutting device. According to one embodiment of the present invention, the automatic cutting device is a CNC circular saw disk.

[0049] Automatic feeding device

[0050] The automatic feeding device is arranged below the automatic cutting device, and is used to transport the steel pipe short section to the heating device. According to one embodiment of the present invention, the automatic feeding device includes a feeding conveyor belt and an automatic loader. The feeding conveyor belt is arranged below the automatic cutting device, and is used to transport the steel pipe short section to the automatic loader. The automatic loader is arranged below the feeding conveyor belt, and is used to receive the steel pipe short section transported by the feeding conveyor belt and supply the steel pipe short section to the heating device. A feeding port is arranged at the top of the automatic loader, and a discharging port is arranged at the bottom of the automatic loader.

[0051] Heating device

[0052] The heating device is arranged below the automatic feeding device, and is used to heat the steel pipe short section to a specified temperature. The heating device can be a medium frequency heating furnace. A feeding channel is arranged on the top of the heating device, and the steel pipe short section enters the heating device through the feeding channel. A discharging channel is arranged at the bottom of the heating device, and the discharging channel is provided with a discharging port, and the heated steel pipe short section is discharged from the discharging port. In some embodiments, the discharging channel is provided with two discharging ports, namely a first discharging port and a second discharging port. According to one embodiment of the present invention, the discharging channel is arched, and the first discharging port and the second discharging port are respectively arranged at both ends of the discharging channel.

[0053] The discharge port of the discharge channel can be provided with a temperature recognition and automatic screening system, which is used to automatically identify the steel pipe short sections of the specified temperature and the steel pipe short sections of the non-specified temperature, and remove the steel pipe short sections of the non-specified temperature, and send the steel pipe short sections of the specified temperature to the automatic conveying device.

[0054] Automatic conveying device

[0055] The automatic conveying device is arranged near the discharge port of the discharge channel, and is used to convey the heated steel pipe short section discharged from the discharge channel to the ring rolling machine. The automatic conveying device can be a robotic arm. In some embodiments, the automatic conveying device includes a first automatic conveying device and a second automatic conveying device. The first automatic conveying device is arranged near the first discharge port, and is used to convey the steel pipe short section discharged from the first discharge port to the first ring rolling machine. The second automatic conveying device is arranged near the second discharge port, and is used to convey the steel pipe short section discharged from the second discharge port to the second ring rolling machine.

[0056] Ring Rolling Machine

[0057] The ring rolling machine is used to roll the steel pipe short section conveyed by the automatic conveying device into a bearing ring blank preform. In some embodiments, the ring rolling machine includes two groups, namely a first ring rolling machine and a second ring rolling machine. The first ring rolling machine is used to roll the steel pipe short section conveyed by the first automatic conveying device into a bearing ring blank preform. The second ring rolling machine is used to roll the steel pipe short section conveyed by the second automatic conveying device into a bearing ring blank preform.

[0058] Automatic conveyor

[0059] The automatic conveying device is provided with a spray cooling device. The automatic conveying device is used to convey the bearing ring blank preform into the cooling range of the spray cooling device. In some embodiments, the automatic conveying device also conveys the bearing ring blank to a collecting device. The collecting device can be a stacking collector. In some embodiments, the automatic conveying device includes a discharge conveyor belt and a conveyor belt. The discharge conveyor belt is arranged near the discharge port of the ring rolling machine, and conveys the bearing ring blank preform formed by the ring rolling machine to the conveyor belt. The conveyor belt is connected to the discharge conveyor belt. In other embodiments, the automatic conveying device includes a first discharge conveyor belt, a second discharge conveyor belt and a conveyor belt. The first discharge conveyor belt is arranged near the discharge port of the first ring rolling machine, and is used to convey the bearing ring blank preform formed by the first ring rolling machine to the conveyor belt. The second discharge conveyor belt is arranged near the discharge port of the second ring rolling device, and is used to convey the bearing ring blank preform formed by the second ring rolling machine to the conveyor belt. The conveyor belts are respectively connected to the first discharge conveyor belt and the second discharge conveyor belt.

[0060] The spray head of the spray cooling device can be arranged above the conveyor belt. The bearing ring blank preform is cooled by the spray cooling device on the conveyor belt to form the bearing ring blank.

[0061] Automatic loading platform

[0062] The equipment for manufacturing bearing ring blanks of the present invention may also include an automatic feeding stand. The automatic feeding stand is arranged above the automatic cutting device and is inclined downward to the cutting part of the automatic cutting device, and is used to supply hot-rolled thick-walled seamless steel pipes to the automatic cutting device. The hot-rolled thick-walled seamless steel pipe is placed on the automatic feeding stand by a crane, and the hot-rolled thick-walled seamless steel pipe automatically leans toward the cutting part of the automatic cutting device. The automatic feeding stand can be set to one or more. In some embodiments, the automatic feeding stand includes two groups, namely a first automatic feeding stand and a second automatic feeding stand. The first automatic feeding stand is arranged above the first automatic cutting device and is inclined downward to the cutting part of the first automatic cutting device. The second automatic feeding stand is arranged above the second automatic cutting device and is inclined downward to the cutting part of the automatic cutting device.

[0063] Palletizing robots and palletizing collectors

[0064] The equipment for manufacturing bearing ring blanks of the present invention may also include a palletizing robot and a palletizing collector. The palletizing robot is used to transfer the bearing ring blanks on the automatic conveying device to the palletizing collector. The palletizing robot is arranged above the transmission belt and close to the segment collector. The palletizing collector is used to collect the bearing ring blanks. The palletizing collector may be arranged on one side of the automatic conveying device. According to one embodiment of the present invention, the palletizing collector is arranged on one side of the conveyor belt. The bearing ring blanks are conveyed to the area where the palletizing robot can pick them up via the automatic conveying device, and then conveyed to the palletizing collector via the palletizing robot.

[0065] <Method for manufacturing bearing ring blank>

[0066] The method for manufacturing a bearing ring blank of the present invention adopts the equipment described above, and specifically includes the following steps: (1) a cutting step; (2) a heating step; (3) a ring rolling step; and (4) a conveying and cooling step.

[0067] Cutting steps

[0068] The hot-rolled thick-walled seamless steel pipe is cut into short sections of steel pipe by an automatic cutting device. According to one embodiment of the present invention, the hot-rolled thick-walled seamless steel pipe is placed on an automatic feeding stand. The hot-rolled thick-walled seamless steel pipe automatically leans toward the cutting part of the automatic cutting device. The automatic feeding stand of the hot-rolled thick-walled seamless steel pipe is fed into the automatic cutting device and cut into short sections of steel pipe by the automatic cutting device.

[0069] In the present invention, the hot-rolled thick-walled seamless steel pipe is a hot-rolled thick-walled seamless steel pipe formed of GCr15 bearing steel. The outer diameter of the hot-rolled thick-walled seamless steel pipe can be 60 to 90 mm, preferably 65 to 85 mm, and more preferably 70 to 75 mm. The wall thickness of the hot-rolled thick-walled seamless steel pipe can be 5 to 13 mm, preferably 6 to 12 mm, and more preferably 6 to 10 mm.

[0070] Heating steps

[0071] The steel pipe pup section enters the heating device through the automatic feeding device for heating to obtain the heated steel pipe pup section. In some embodiments, the steel pipe pup section is transported to the automatic loader via the feeding conveyor belt. The automatic loader supplies the received steel pipe pup section transported by the feeding conveyor belt to the heating device. The steel pipe pup section is heated by the heating device to obtain the heated steel pipe pup section. The heated steel pipe pup section is discharged through the discharge port of the discharge channel. The heated steel pipe pup section can be discharged from multiple discharge ports, for example, two. The preheating temperature of the discharge control heating device is 400-700°C; preferably 500-700°C; more preferably 550-700°C. The heating temperature is 800-1200°C; preferably 800-1100°C; more preferably 900-1000°C.

[0072] In some embodiments, the heated steel pipe short sections are screened by a temperature recognition and automatic screening system, and the steel pipe short sections with temperatures within the heating temperature range are sent to the automatic conveying device, and the steel pipe short sections with temperatures outside the heating temperature range are removed. Preferably, each discharge port is provided with a temperature recognition and automatic screening system.

[0073] Ring rolling steps

[0074] The heated steel pipe short section is transported to the ring rolling machine via an automatic conveying device and rolled into a bearing ring blank preform. The ring rolling machine is set to have a rolling ratio of not less than 1.3; preferably 1.3-1.8; more preferably 1.4-1.6. The end elongation is 2-6%; preferably 3-6%; more preferably 3-5%. The automatic conveying device and the ring rolling machine can be set as one group or multiple groups. The parameters set for the ring rolling machine can be the same or different. According to one embodiment of the present invention, the parameters set for the ring rolling machine are the same.

[0075] Shipping and cooling steps

[0076] The bearing ring blank preform is put into the automatic conveying device and cooled by the spray cooling device of the automatic conveying device to obtain the bearing ring blank. In some embodiments, the bearing ring blank preform is transported to the discharge conveyor belt through the discharge port of the ring rolling machine, and the discharge conveyor belt transports the bearing ring blank preform to the conveyor belt. In other embodiments, the bearing ring blank preform formed by the first ring rolling machine is transported to the first discharge conveyor belt through the discharge port of the first ring rolling machine, and the first discharge conveyor belt transports the bearing ring blank preform to the conveyor belt. The bearing ring blank preform formed by the second ring rolling machine is transported to the second discharge conveyor belt through the discharge port of the second ring rolling machine, and the second discharge conveyor belt transports the bearing ring blank preform to the conveyor belt. The bearing ring blank preform is cooled by the spray cooling device to form a bearing ring blank. The bearing ring blank is transported to the area where the stacking robot can pick it up through the conveyor belt, and is transported to the stacking collector by the stacking robot.

[0077] The cooling condition is that the temperature of the bearing ring blank preform is reduced by 55 to 80°C per hour; preferably 55 to 70°C; more preferably 55 to 60°C. The cooling is completed when the temperature of the bearing ring blank preform drops to 150 to 250°C. Preferably, the cooling is completed when the temperature of the bearing ring blank preform drops to 180 to 250°C. More preferably, the cooling is completed when the temperature of the bearing ring blank preform drops to 180 to 220°C. Such cooling conditions can prevent the formation of network carbides.

[0078] Example 1

[0079] Figure 1 This is a device for manufacturing a bearing ring blank according to the present invention. Figure 1 As shown, the equipment for manufacturing bearing ring blanks includes an automatic loading stand 100, an automatic cutting device 200, an automatic feeding device 300, a heating device 8, an automatic conveying device 400, a ring rolling machine 500, an automatic transport device 600, a spray cooling device 17, a stacking robot 18 and a stacking collector 19.

[0080] The automatic feeding stand 100 is arranged above the automatic cutting device 200, and supplies the hot-rolled thick-walled seamless steel pipe to the automatic cutting device 200. The automatic feeding stand 100 is arranged to be tilted downward toward the cutting part of the automatic cutting device 200.

[0081] The automatic cutting device 200 is a numerically controlled circular saw, which cuts the hot-rolled thick-walled seamless steel pipe into short sections of steel pipe.

[0082] The automatic feeding device 300 includes a feeding conveyor belt 5 and an automatic loader 6. The feeding conveyor belt 5 is arranged below the automatic cutting device 200, and transports the steel pipe short section to the automatic loader 6. The automatic loader 6 is arranged below the feeding conveyor belt 5, receives the steel pipe short section transported by the feeding conveyor belt 5, and supplies the steel pipe short section to the heating device 8.

[0083] The heating device 8 is a medium frequency heating furnace, which is arranged below the automatic feeder 6, and heats the steel pipe short section to a specified temperature to form a heated steel pipe short section. A feeding channel 7 is arranged on the top of the heating device 8. The steel pipe short section enters the heating device 8 through the feeding channel 7. A discharge channel 9 is arranged at the bottom of the heating device 8. A discharge port is arranged at the end of the discharge channel 9. The heated steel pipe short section is discharged from the discharge port.

[0084] The discharge port of the discharge channel 9 is provided with a temperature recognition and automatic screening system, which can automatically identify the steel pipe short sections of the specified temperature and the steel pipe short sections of the non-specified temperature, and remove the steel pipe short sections of the non-specified temperature, and send the steel pipe short sections of the specified temperature to the automatic conveying device.

[0085] An automatic conveying device 400 is provided near the discharge port of the discharge channel 9, which is a mechanical arm, and conveys the steel pipe short section at a specified temperature to the ring rolling machine 500. The ring rolling machine 500 rolls the steel pipe short section into a bearing ring blank preform.

[0086] The automatic conveying device 600 includes a discharge conveyor belt 700 and a conveyor belt 16. The ring rolling machine 500 is provided with a discharge port. The discharge conveyor belt 700 is arranged near the discharge port of the ring rolling machine 500, and conveys the bearing ring blank preform formed by the ring rolling machine 500 to the conveyor belt 16. The conveyor belt 16 is connected to the discharge conveyor belt 700.

[0087] The spray head of the spray cooling device 17 is arranged above the conveyor belt 16 to cool the bearing ring blank preform to form a bearing ring blank. The palletizing collector 19 is arranged at one end of the conveyor belt 16. The palletizing robot 18 is arranged above the transmission belt 14 and close to the palletizing collector 19. The bearing ring blank is conveyed to the area where the palletizing robot 18 can pick it up via the conveyor belt 16, and then transported to the palletizing collector 19 via the palletizing robot 18.

[0088] Example 2

[0089] Figure 2 Another device for manufacturing a bearing ring blank of the present invention. Figure 2As shown, the equipment for manufacturing bearing ring blanks includes an automatic loading stand 100, an automatic cutting device 200, an automatic feeding device 300, a heating device 8, an automatic conveying device 400, a ring rolling machine 500, an automatic transport device 600, a spray cooling device 17, a stacking robot 18 and a stacking collector 19.

[0090] The automatic feeding stand 100 includes two groups, namely the first automatic feeding stand 1 and the second automatic feeding stand 2. The automatic cutting device 200 includes two groups, namely the first automatic cutting device 3 and the second automatic cutting device 4. The first automatic feeding stand 1 is arranged above the first automatic cutting device 3, and supplies the hot-rolled thick-walled seamless steel pipe to the first automatic cutting device 3. The first automatic feeding stand 1 is tilted downwardly toward the cutting part of the first automatic cutting device 3. The second automatic feeding stand 2 is arranged above the second automatic cutting device 4, and supplies the hot-rolled thick-walled seamless steel pipe to the second automatic cutting device 4. The second automatic feeding stand 2 is tilted downwardly toward the cutting part of the second automatic cutting device 4. The first automatic cutting device 3 and the second automatic cutting device 4 cut the hot-rolled thick-walled seamless steel pipe into short sections of steel pipes. The first automatic cutting device 3 is a CNC circular saw, and the second automatic cutting device 4 is a CNC circular saw.

[0091] The automatic feeding device 300 includes a feeding conveyor belt 5 and an automatic loader 6. The feeding conveyor belt 5 is arranged below the automatic cutting device 200, and transports the steel pipe short section to the automatic loader 6. The automatic loader 6 is arranged below the feeding conveyor belt 5, receives the steel pipe short section transported by the feeding conveyor belt 5, and supplies the steel pipe short section to the heating device 8.

[0092] The heating device 8 is a medium frequency heating furnace, which is arranged below the automatic feeder 6, and heats the steel pipe short section to a specified temperature to form a heated steel pipe short section. A feeding channel 7 is arranged on the top of the heating device 8. The steel pipe short section enters the heating device 8 through the feeding channel 7. A discharge channel 9 is arranged at the bottom of the heating device 8. The discharge channel 9 is arched, and a first discharge port and a second discharge port are arranged at both ends thereof. The heated steel pipe short section is discharged from the first discharge port and the second discharge port.

[0093] The first discharge port and the second discharge port are both provided with a temperature identification and automatic screening system, which can automatically identify the steel pipe short sections of the specified temperature and the steel pipe short sections of the non-specified temperature, remove the steel pipe short sections of the non-specified temperature, and send the steel pipe short sections of the specified temperature to the automatic conveying device.

[0094] The automatic transport device 400 includes a first automatic transport device 12 and a second automatic transport device 13. The ring rolling machine 500 includes a first ring rolling machine 10 and a second ring rolling machine 11. A first automatic transport device 12 is provided near the first discharge port, which is a robot arm that transports a steel pipe short section at a specified temperature to the first ring rolling machine 10. The first ring rolling machine 10 rolls the steel pipe short section from the first automatic transport device 12 into a bearing ring blank preform. A second automatic transport device 13 is provided near the second discharge port, which is a robot arm that transports a steel pipe short section at a specified temperature to the second ring rolling machine 11. The second ring rolling machine 11 rolls the steel pipe short section from the second automatic transport device 13 into a bearing ring blank preform.

[0095] The automatic conveying device 600 includes a discharge conveyor belt 700 and a conveyor belt 16. The discharge conveyor belt 700 includes a first discharge conveyor belt 14 and a second discharge conveyor belt 15. The first ring rolling machine 10 is provided with a discharge port. The first discharge conveyor belt 14 is arranged near the discharge port of the first ring rolling machine 10, and conveys the bearing ring blank preform formed by the first ring rolling machine 10 to the conveyor belt 16. The second ring rolling machine 11 is provided with a discharge port. The second discharge conveyor belt 15 is arranged near the discharge port of the second ring rolling machine 11, and conveys the bearing ring blank preform formed by the second ring rolling machine 11 to the conveyor belt 16. The conveyor belt 16 is connected to the first discharge conveyor belt 14 and the second discharge conveyor belt 15, respectively.

[0096] The spray head of the spray cooling device 17 is arranged above the conveyor belt 16 to cool the bearing ring blank preform to form a bearing ring blank. The palletizing collector 19 is arranged at one end of the conveyor belt 16. The palletizing robot 18 is arranged above the transmission belt 14 and close to the palletizing collector 19. The bearing ring blank is conveyed to the area where the palletizing robot 18 can pick it up via the conveyor belt 16, and then transported to the palletizing collector 19 via the palletizing robot 18.

[0097] Example 3

[0098] The equipment of Example 2 is used to process the bearing ring blank.

[0099] The hot-rolled thick-walled seamless steel pipe (outer diameter 73mm, wall thickness 8mm) formed of GCr15 bearing steel is placed on the first automatic feeding platform 1 and the second automatic feeding platform 2 by a crane. The hot-rolled thick-walled seamless steel pipe automatically approaches the cutting part of the automatic cutting device. The hot-rolled thick-walled seamless steel pipe is fed from the first automatic feeding platform 1 and the second automatic feeding platform 2 to the first automatic cutting device 3 and the second automatic cutting device 4 respectively, and is cut into steel pipe short sections by the first automatic cutting device 3 and the second automatic cutting device 4. The length of the steel pipe short section is 23.52mm.

[0100] The steel pipe short section is transported to the automatic feeder 6 via the feeding conveyor 5. The automatic feeder 6 receives the steel pipe short section and supplies it to the heating device 8 via the feeding channel 7. The preheating temperature of the heating device 8 is controlled to be 600-650°C, and the heating temperature is 950-1000°C to form a heated steel pipe short section. The heated steel pipe short section is screened by the temperature recognition and automatic screening system, and the steel pipe short section with the specified temperature (950-1000°C) is sent to the first automatic conveying device 12 through the first discharge port or sent to the second automatic conveying device 13 through the second discharge port, and the steel pipe short section with a temperature less than 950°C or greater than 1000°C is removed.

[0101] The steel pipe short section at the specified temperature discharged from the first discharge port is transported to the first ring rolling machine 10 via the first automatic conveying device 12. The steel pipe short section at the specified temperature discharged from the second discharge port is transported to the second ring rolling machine 11 via the second automatic conveying device 13. The rolling ratio of the first ring rolling machine 10 and the second ring rolling machine 11 is set to 1.53, and the end surface elongation is 4%, and a bearing ring blank preform with an outer diameter of 91.3 mm, a thickness of 8.8 mm (including the groove) and a height of 24 mm is obtained.

[0102] The bearing ring blank preform formed by the first ring rolling machine 10 is transported to the first discharging conveyor belt 14 through the discharging port of the first ring rolling machine 10, and the first discharging conveyor belt 14 transports the bearing ring blank preform to the conveyor belt 16. The bearing ring blank preform formed by the second ring rolling machine 11 is transported to the second discharging conveyor belt 15 through the discharging port of the second ring rolling machine 11, and the second discharging conveyor belt 15 transports the bearing ring blank preform to the conveyor belt 16.

[0103] The bearing ring blank preform is cooled by the spray cooling device 17 to form a bearing ring blank. The spray cooling device is controlled to cool the bearing ring blank preform to 200° C. at a cooling rate of 55° C. / h to complete the cooling.

[0104] The bearing ring blanks are conveyed via the conveyor belt 16 to an area where the palletizing robot 18 can pick them up, and are transported to the palletizing collector 19 via the palletizing robot 18 .

[0105] The bearing ring blank prepared in this embodiment was tested according to GB T224-2008 standard, and the depth of the decarburized layer was less than 0.1 mm, and no network carbide was formed on the surface.

[0106] Comparative Example 1

[0107] The spray cooling equipment was omitted and conventional cooling was adopted to cool the bearing ring blank preform at a cooling rate of 50°C / h. The other conditions were the same as those in Example 1 to obtain a bearing ring blank. According to the GB T224-2008 standard, the decarburized layer depth was less than 0.1 mm, and a network of carbides was formed on the surface.

[0108] Comparative Example 2

[0109] The designated temperature of the heated steel pipe short section was set to 760-780°C, and the other conditions were the same as those in Example 1 to obtain a bearing ring blank. According to the GB T224-2008 standard, the depth of the decarburized layer was less than 0.1 mm, and a network of carbides was formed on the surface.

[0110] Comparative Example 3

[0111] The bearing steel tube is obtained by adopting the preparation method of the specific implementation method of CN102267040B. According to the test of GB T224-2008 standard, the depth of the decarburized layer is less than 0.1 mm, and a network of carbides is formed on the surface.

[0112] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement and substitution that can be thought of by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A device for manufacturing a bearing ring blank, characterized in that: include: Automatic cutting device, automatic feeding device, heating device, automatic conveying device, ring rolling machine and automatic transport device; The automatic cutting device is used to cut the hot-rolled thick-walled seamless steel pipe into steel pipe short sections; a feed port is provided at the top of the automatic cutting device, and a discharge port is provided at the bottom of the automatic cutting device; the hot-rolled thick-walled seamless steel pipe enters from the feed port of the automatic cutting device, and the automatic cutting device cuts the hot-rolled thick-walled seamless steel pipe into steel pipe short sections, and the steel pipe short sections are discharged from the discharge port of the automatic cutting device; The automatic feeding device is arranged below the automatic cutting device, and is used to convey the steel pipe short section to the heating device; the automatic feeding device comprises a feeding conveyor belt and an automatic loader; the feeding conveyor belt is arranged below the automatic cutting device, and is used to convey the steel pipe short section to the automatic loader; the automatic loader is arranged below the feeding conveyor belt, and is used to receive the steel pipe short section conveyed by the feeding conveyor belt, and supply the steel pipe short section to the heating device; The heating device is arranged below the automatic feeding device, and is used to heat the steel pipe short section to a specified temperature; a feeding channel is arranged on the top of the heating device, and the steel pipe short section enters the heating device through the feeding channel; a discharging channel is arranged at the bottom of the heating device, and the discharging channel is provided with a discharging port, and the heated steel pipe short section is discharged from the discharging port; The automatic conveying device is arranged near the discharge port of the discharge channel, and is used to convey the heated steel pipe short section discharged from the discharge channel to the ring rolling machine; The ring rolling machine is used to roll the heated steel pipe short section conveyed by the automatic conveying device into a bearing ring blank preform; The automatic conveying device has a spray cooling device, and the automatic conveying device is used to convey the bearing ring blank pre-product to the cooling range of the spray cooling device; the spray cooling device is used to cool the bearing ring blank pre-product to obtain the bearing ring blank.

2. The device according to claim 1, characterized in that The discharging channel is provided with a first discharging port and a second discharging port; the automatic conveying device comprises two groups, namely a first automatic conveying device and a second automatic conveying device; the ring rolling machine comprises two groups, namely a first ring rolling machine and a second ring rolling machine; The first automatic conveying device is used to convey the steel pipe short section discharged from the first discharge port to the first ring rolling machine; The first ring rolling machine is used to roll the steel pipe short section conveyed by the first automatic conveying device into a bearing ring blank preform; The second automatic conveying device is used to convey the steel pipe short section discharged from the second discharge port to the second ring rolling machine; The second ring rolling machine is used to roll the steel pipe short section conveyed by the second automatic conveying device into a bearing ring blank preform.

3. The device according to claim 2, characterized in that The discharge channel is arched, and the first discharge port and the second discharge port are respectively arranged at two ends of the discharge channel.

4. The device according to claim 1, characterized in that The equipment also includes an automatic feeding platform, which is arranged above the automatic cutting device and tilted downward to the cutting part of the automatic cutting device, and is used to supply hot-rolled thick-walled seamless steel pipes to the automatic cutting device.

5. The device according to claim 2, characterized in that The equipment also includes a palletizing robot and a palletizing collector; The palletizing robot is used to transfer the bearing ring blanks on the automatic conveying device to the palletizing collector; The stacking collector is used to collect bearing ring blanks.

6. The device according to claim 1, characterized in that The automatic cutting device is a numerically controlled circular saw, the heating device is a medium frequency heating furnace, and the automatic conveying device is a mechanical arm.

7. The device according to claim 5, characterized in that The automatic conveying device includes a first discharging conveyor belt, a second discharging conveyor belt and a conveyor belt; the stacking collector is arranged at one end of the conveyor belt, and the nozzle of the spray cooling device is arranged above the conveyor belt; The first ring rolling machine is provided with a discharge port, and the first discharge conveyor belt is arranged near the discharge port of the first ring rolling machine, and is used to convey the bearing ring blank preform formed by the first ring rolling machine to the conveyor belt; The second ring rolling machine is provided with a discharge port, and the second discharge conveyor belt is arranged near the discharge port of the second ring rolling machine, and is used to convey the bearing ring blank preform formed by the second ring rolling machine to the conveyor belt; The conveyor belts are respectively connected to the first discharge conveyor belt and the second discharge conveyor belt. The bearing ring blank preform is cooled by a spray cooling device on the conveyor belt to form a bearing ring blank. The bearing ring blank is transported by the conveyor belt to an area where a palletizing robot can pick it up, and then transferred to a palletizing collector by the palletizing robot.

8. A method for manufacturing a bearing ring blank using the apparatus according to any one of claims 1 to 7, characterized in that: The steps include: (1) cutting a hot-rolled thick-walled seamless steel pipe into steel pipe short sections by an automatic cutting device, wherein the hot-rolled thick-walled seamless steel pipe is formed of GCr15 bearing steel; (2) The steel pipe short section enters the heating device through the automatic feeding device for heating to obtain a heated steel pipe short section; the preheating temperature of the heating device is controlled to be 400-700°C and the heating temperature is 800-1200°C; (3) The heated steel pipe short section is transported to the ring rolling machine through an automatic conveying device and rolled into a bearing ring blank preform; (4) The bearing ring blank preform enters the automatic conveying device and is cooled by the spray cooling device of the automatic conveying device, and the temperature is reduced to 150-250° C. at a cooling rate of 55-80° C. / h to obtain the bearing ring blank.

9. The method according to claim 8, characterized in that In step (1), the length of the steel pipe short section is 10 to 40 mm; in step (3), the ring rolling machine is set to have a rolling ratio of not less than 1.3.

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