Metal bar thread rolling device

Abstract

The invention discloses a metal rod thread rolling device which comprises a thread rolling plate body and a base, a plurality of teeth are arranged on the thread rolling plate body, through holes are formed in the bottoms between the teeth, a scrap removing mechanism is fixedly installed at the rear end of the thread rolling plate body, a movable fan is arranged at the upper end of the scrap removing mechanism, and a partition plate is fixedly connected to the lower portion of the middle in the base. The interior of the base is divided into a driving bin and an oil bin through a partition plate, lubricating oil is contained in the oil bin, a liftable lifting plate is arranged in the oil bin, and a sponge block is fixedly installed on the upper surface of the lifting plate. According to the metal rod thread rolling device, the tooth collapse phenomenon can be reduced from the source through the thread rolling plate body manufacturing technology, gaps between teeth can be cleaned through the scrap cleaning mechanism before the thread rolling work starts, the phenomenon that foreign matter or metal scraps affect the thread rolling work and cause the tooth collapse phenomenon is avoided, and after the thread rolling work is finished, the tooth collapse phenomenon is avoided. Lubricating oil is conveyed to the surfaces of the thread rolling plate body and the teeth through the sponge block to form an oil film, and tooth collapse can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of metal rod thread rolling, in particular to a metal rod thread rolling device. Background Art

[0002] A metal rod is placed between the two thread rolling plates of the thread rolling machine. By applying pressure, the metal rod can be deformed to form threads. The fixed thread rolling plate is located at the bottom of the thread rolling machine. Compared with the movable thread rolling plate, the fixed thread rolling plate is subjected to relatively greater pressure, and the thread is prone to chipping after long-term use.

[0003] The reason for this phenomenon is that when the teeth of the thread rolling plate are subjected to excessive pressure that exceeds the stress they can withstand, or when they encounter abnormal resistance during the thread rolling process, such as metal debris or metal foreign matter remaining in the gaps between the teeth, it is easy to cause the teeth of the thread rolling plate to collapse.

[0004] In summary, we propose a metal rod thread rolling device to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a metal rod thread rolling device which can effectively avoid the occurrence of tooth breakage through structural and process improvements.

[0006] To achieve the above object, the present invention proposes the following scheme: A metal rod thread rolling device comprises a thread rolling plate body and a base. A plurality of teeth are integrally formed on the thread rolling plate body. The thread rolling plate body is fixedly connected to the base. A through hole is opened at the bottom between the teeth. The through hole passes through the thread rolling plate body and leads to the inside of the base. A chip cleaning mechanism is fixedly installed at the rear end of the thread rolling plate body. A movable fan is provided at the upper end of the chip cleaning mechanism. A partition is fixedly connected to the lower middle part of the base. The inside of the base is divided into a drive bin and an oil bin by the partition. A drive assembly is provided inside the drive bin. Lubricating oil is filled inside the oil bin. A lift plate is provided inside the oil bin. A sponge block is fixedly installed on the upper surface of the lift plate.

[0007] A first motor is installed on one side of the chip cleaning mechanism, and a first threaded rod and a moving block are arranged inside the chip cleaning mechanism. The first motor is transmission-connected to the first threaded rod, the first threaded rod is threadedly connected to the moving block, a gooseneck is fixedly connected to the upper end of the moving block, and the upper end of the gooseneck is fixedly connected to the fan.

[0008] A second motor is installed on the outer surface of the base, and a rotating rod is connected to the inner wall of the driving bin for rotation. The second motor is transmission-connected to the rotating rod, and a driving bevel gear is fixedly sleeved on the outer surface of the rotating rod.

[0009] A driving gear and a driven gear are arranged inside the driving bin. Four driven gears are arranged around the driving gear. A driven bevel gear is fixedly connected to the lower end of the driving gear. The driven bevel gear is meshed with the driving bevel gear. The driving gear is meshed with the driven gear. A driven rod is fixedly inserted through the center of the driven gear, and the driven rod penetrates upward into the oil bin.

[0010] An oil inlet is provided on the outer surface of the oil bin, which can be closed by an end cover. A second threaded rod is rotatably connected to the inner wall of the oil bin, and the upper end of the driven rod is fixedly connected to the second threaded rod. The outer surface of the second threaded rod is threadedly connected to the lifting plate, and the sponge block can contact the through hole upward.

[0011] Heat treatment before grinding the teeth specifically means that the raw materials are first heated in a salt bath furnace and then the teeth are ground using a diamond roller.

[0012] The raw material is W18Cr4V high-speed steel, which is ground by a grinder before heat treatment.

[0013] After grinding the tooth shape, the TiN coating is deposited on the surface of the thread rolling plate using the physical vapor deposition (PVD) method.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The metal rod thread rolling device of the present invention can reduce the occurrence of tooth breakage from the source through a special manufacturing process of the thread rolling plate. Compared with the traditional fixed thread rolling plate that first grinds the tooth shape and then heat treats it, the present manufacturing process adopts the method of first heat treating and then grinding the tooth shape. In this way, the overall heating and cooling during the heat treatment can be uniform, so that the subsequent tooth shape has better hardness and toughness.

[0015] (2) In a metal rod thread rolling device of the present invention, a chip cleaning mechanism can clean the gaps between teeth before the thread rolling work begins, thereby preventing foreign matter or metal chips from affecting the thread rolling work.

[0016] (3) In a metal rod thread rolling device of the present invention, after the thread rolling work is completed, the lubricating oil can be transported to the thread rolling plate body and the tooth surface through the sponge block to form an oil film. The oil film plays a role in lubrication and rust prevention, reduces tooth wear, and effectively avoids tooth breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the whole of the present invention; Figure 2 A schematic diagram of another angle of the present invention; Figure 3 A schematic diagram of a chip cleaning mechanism of the present invention; Figure 4 It is a schematic diagram of a thread rolling plate body of the present invention; Figure 5 is a schematic diagram of a through hole of the present invention; Figure 6 is a schematic diagram of the internal structure of the base of the present invention; Figure 7 It is a schematic diagram of the internal structure of the drive compartment of the present invention; Figure 8 It is a schematic diagram of the second motor transmission of the present invention.

[0018] In the figure: 1. thread rolling plate; 11. teeth; 12. through hole; 2. chip cleaning mechanism; 21. first motor; 22. first threaded rod; 23. moving block; 24. gooseneck; 25. fan; 3. base; 310. partition; 31. driving bin; 311. second motor; 312. rotating rod; 313. driving bevel gear; 314. driven bevel gear; 315. driving gear; 316. driven gear; 317. driven rod; 32. oil bin; 321. second threaded rod; 322. lifting plate; 323. sponge block; 324. oil inlet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-8 A metal rod thread rolling device comprises a thread rolling plate body 1 and a base 3. The thread rolling plate body 1 is integrally formed with a plurality of teeth 11. The thread rolling plate body 1 is fixedly connected to the base 3. A through hole 12 is provided at the bottom between the teeth 11. The through hole 12 passes through the thread rolling plate body 1 and leads to the inside of the base 3. A chip cleaning mechanism 2 is fixedly installed at the rear end of the thread rolling plate body 1. A movable fan 25 is provided at the upper end of the chip cleaning mechanism 2. A partition plate 310 is fixedly connected to the lower middle of the base 3. The inside of the base 3 is divided into a drive bin 31 and an oil bin 32 by the partition plate 310. A drive component is provided inside the drive bin 31, and lubricating oil is provided inside the oil bin 32. A lift plate 322 is provided inside the oil bin 32, and a sponge block 323 is fixedly installed on the upper surface of the lift plate 322. When in use, the manufacturing process of the thread rolling plate 1 can reduce the occurrence of tooth breakage at the source. At the same time, the chip cleaning mechanism 2 can clean the gaps between the teeth 11 before the thread rolling work begins to prevent foreign matter or metal chips from affecting the thread rolling work and causing tooth breakage. After the thread rolling work is completed, the lubricating oil is transported to the surface of the thread rolling plate 1 and the teeth 11 through the sponge block 323 to form an oil film, which can also achieve the effect of avoiding tooth breakage, thereby enriching the overall function and increasing the overall applicability.

[0021] Furthermore, a first motor 21 is installed on one side of the chip cleaning mechanism 2, and a first threaded rod 22 and a moving block 23 are provided inside the chip cleaning mechanism 2. The first motor 21 is transmission-connected to the first threaded rod 22, and the first threaded rod 22 is threadedly connected to the moving block 23. A gooseneck 24 is fixedly connected to the upper end of the moving block 23, and the upper end of the gooseneck 24 is fixedly connected to the fan 25. When in use, before the thread rolling process, the staff can first operate the position of the gooseneck 24 to align the fan 25 with the gap between the teeth 11, and then start the first motor 21 and the fan 25. The first motor 21 drives the first threaded rod 22 to rotate, and then the gooseneck 24 and the fan 25 can be driven by the moving block 23 to move slowly left and right, so that the fan 25 generates wind force to carefully clean the metal chips and foreign matter in the gap to ensure the subsequent thread rolling efficiency and avoid the tooth 11 being worn by foreign matter, causing tooth collapse.

[0022] Furthermore, a second motor 311 is installed on the outer surface of the base 3, and a rotating rod 312 is rotatably connected to the inner wall of the driving chamber 31. The second motor 311 is transmission-connected to the rotating rod 312, and an active bevel gear 313 is fixedly sleeved on the outer surface of the rotating rod 312. When in use, by starting the second motor 311, the second motor 311 can drive the rotating rod 312 to rotate, and the rotation of the rotating rod 312 can drive the active bevel gear 313 to rotate.

[0023] Furthermore, a driving gear 315 and a driven gear 316 are provided inside the driving bin 31, and four driven gears 316 are arranged around the driving gear 315. A driven bevel gear 314 is fixedly connected to the lower end of the driving gear 315, and the driven bevel gear 314 is meshed with the driving bevel gear 313. The driving gear 315 is meshed with the driven gear 316. A driven rod 317 is fixedly inserted through the center of the driven gear 316, and the driven rod 317 penetrates upward into the oil bin 32. When in use, when the driving bevel gear 313 rotates, it can drive the driven bevel gear 314 to rotate, and then drive the driving gear 315 to rotate. The driving gear 315 then drives the driven gear 316 surrounding it to rotate through meshing, and the driven gear 316 then drives the driven rod 317 to rotate.

[0024] Furthermore, an oil inlet 324 is provided on the outer surface of the oil bin 32, and the oil inlet 324 can be closed by an end cover. The inner wall of the oil bin 32 is rotatably connected to a second threaded rod 321, and the upper end of the driven rod 317 is fixedly connected to the second threaded rod 321. The outer surface of the second threaded rod 321 is threadedly connected to the lifting plate 322, and the sponge block 323 can contact the through hole 12 upward. When in use, lubricating oil is injected into the oil bin 32 through the oil inlet 324. After each thread rolling work is completed, the second motor 31 is started. 1, and the four second threaded rods 321 are driven to rotate through the driven rod 317, and the second threaded rods 321 drive the lifting plate 322 and the sponge block 323 to rise. At this time, the sponge block 323 absorbs the lubricating oil. When it rises to collide with the upper wall of the oil bin 32, the lubricating oil can be squeezed through the through hole 12 to the surface of the thread rolling plate body 1 and the teeth 11 through the extrusion force, and a layer of oil film is formed. The oil film can reduce the risk of tooth collapse to a certain extent through lubrication and rust prevention, thereby increasing the overall practicality.

[0025] Furthermore, the method of performing heat treatment before grinding the teeth specifically refers to first heating the raw materials with a salt bath furnace and then grinding the teeth with a diamond roller.

[0026] Furthermore, the raw material is W18Cr4V high speed steel, which is ground by a grinder before heat treatment.

[0027] Furthermore, after grinding the tooth profile, a TiN coating is deposited on the surface of the thread rolling plate using a physical vapor deposition (PVD) method.

[0028] Specific process flow of manufacturing thread rolling plate 1: Step 1: Select high-speed steel W18Cr4V and conduct strict inspection on it. Use spectrum analyzer to check whether the content of carbon, chromium, vanadium and other elements in the material meets the standards. Step 2: Forging W18Cr4V high speed steel, the initial forging temperature is controlled at 1050-1100°C, the final forging temperature is not less than 900°C, and the forging ratio is controlled between 5-10; Step 3: Use a grinder to grind the six planes, control the flatness within a very small range such as 0.005 - 0.01mm, and the surface roughness reaches Ra0.8 - Ra1.6μm; Step 4: Heat treatment, the quenching heating temperature of W18Cr4V high-speed steel is 1260-1280°C, and it is heated in a salt bath furnace to ensure speed and heat uniformity. The insulation time is 1-1.5 minutes per millimeter thickness. The tempering temperature is generally 550-650°C, and the tempering times are 3-4 times; Step 5: Grind the tooth profile with a diamond roller, the tooth profile angle processing accuracy is within ±0.5°, and the tooth pitch accuracy is controlled within ±0.01mm; Step 6: Coating treatment: a TiN coating is deposited on the surface of the thread rolling plate using a physical vapor deposition (PVD) method, with a coating thickness between 1 and 5 μm.

[0029] High-speed steel has the advantages of high hardness, high wear resistance and good hot hardness. The final forging temperature is not less than 900°C, which can prevent defects such as cracks inside the material caused by too low temperature. The forging ratio is between 5-10, which can effectively improve the internal structure of the metal, refine the grains, and make the second phase such as carbide more evenly distributed, thereby improving the comprehensive performance of the material. Accurate control of flatness and surface roughness can improve the accuracy of the thread rolling plate, ensure good contact with the metal rod during the thread rolling process, reduce stress concentration caused by surface unevenness, and thus improve the service life of the thread rolling plate and the quality of thread rolling. Salt bath furnace heating can ensure speed and heat uniformity, so that the high-speed steel is heated evenly as a whole during the quenching process, and reduce thermal stress caused by temperature differences. Appropriate holding time can ensure that the internal structure of the high-speed steel is fully austenitized, providing a good organizational foundation for subsequent quenching transformation. The tempering process can eliminate the internal stress generated by quenching, improve the toughness of the material, and stabilize the organization at the same time, preventing organizational transformation from occurring during use and affecting performance.

[0030] Heat treatment is performed first and then the tooth profile 11 is ground. During the heat treatment process, since the thread rolling plate has not yet ground the tooth profile 11, the overall structure is relatively simple, and there is no complex tooth 11 structure to hinder heat transfer. In this way, during the quenching heating and cooling process, heat can be more evenly transferred in the entire thread rolling plate blank.

[0031] For example, during quenching cooling, some parts will not cool too fast or too slow due to the existence of the tooth 11 structure. If the tooth profile is ground first and then heat treated, the heat dissipation of the tooth 11 will be different from that of other parts, which may easily cause uneven tissue transformation, resulting in uneven hardness, toughness and other properties of the tooth 11, affecting the service life and thread rolling quality of the thread rolling plate. Heat treatment first and then grinding the tooth profile can avoid this situation and ensure the uniformity of the performance of the entire thread rolling plate.

[0032] In summary, the working principle of a metal rod thread rolling device proposed in the present invention is that before the thread rolling process, the staff operates the gooseneck tube 24 to align the fan 25 with the gap between the teeth 11, and then starts the first motor 21 and the fan 25. The first motor 21 drives the first threaded rod 22 to rotate. The first threaded rod 22 is threadedly connected to the moving block 23, so that the moving block 23 drives the gooseneck tube 24 and the fan 25 to move slowly left and right. The fan 25 generates wind to clean up metal chips and foreign matter in the gap, thereby ensuring the subsequent thread rolling efficiency and preventing foreign matter from wearing the teeth 11 and causing tooth collapse. Lubricating oil is injected into the oil tank 32 through the oil inlet 324. After each thread rolling work is completed, the second motor 311 is started, and the second motor 311 drives the rotating rod 312 to rotate. The rotating rod 31 2 drives the active bevel gear 313 to rotate, the active bevel gear 313 is meshed with the driven bevel gear 314, drives the driven bevel gear 314 to rotate, and then drives the active gear 315 to rotate, the active gear 315 is meshed with the driven gear 316, drives the driven gear 316 to rotate, the driven gear 316 drives the driven rod 317 to rotate, the upper end of the driven rod 317 is fixedly connected to the second threaded rod 321, the second threaded rod 321 rotates to drive the lifting plate 322 and the sponge block 323 to rise, the sponge block 323 absorbs the lubricating oil, and when it rises to collide with the upper wall of the oil bin 32, the lubricating oil is squeezed through the through hole 12 to the surface of the thread rolling plate body 1 and the tooth 11 through the extrusion force to form an oil film, and the oil film reduces the risk of tooth collapse through lubrication and rust prevention, thereby increasing the overall practicality.

Claims

1. A metal rod thread rolling device, comprising a base (3) and a thread rolling plate (1) which is first heat treated and then ground into a tooth shape, the thread rolling plate (1) being integrally formed with a plurality of teeth (11), the thread rolling plate (1) being fixedly connected to the base (3), characterized in that: A through hole (12) is provided at the bottom between the teeth (11), and the through hole (12) passes through the thread rolling plate body (1) and leads to the inside of the base (3). A chip cleaning mechanism (2) is fixedly installed at the rear end of the thread rolling plate body (1), and a movable fan (25) is provided at the upper end of the chip cleaning mechanism (2). A partition (310) is fixedly connected to the lower middle of the base (3), and the inside of the base (3) is divided into a drive bin (31) and an oil bin (32) by the partition (310). A drive assembly is provided inside the drive bin (31), and lubricating oil is contained inside the oil bin (32). A lift plate (322) that can be raised and lowered is provided inside the oil bin (32), and a sponge block (323) is fixedly installed on the upper surface of the lift plate (322).

2. A metal rod thread rolling device according to claim 1, characterized in that: A first motor (21) is installed on one side of the chip cleaning mechanism (2); a first threaded rod (22) and a moving block (23) are provided inside the chip cleaning mechanism (2); the first motor (21) is drivingly connected to the first threaded rod (22); the first threaded rod (22) is threadedly connected to the moving block (23); a gooseneck tube (24) is fixedly connected to the upper end of the moving block (23); and the upper end of the gooseneck tube (24) is fixedly connected to the fan (25).

3. A metal rod thread rolling device according to claim 2, characterized in that: A second motor (311) is mounted on the outer surface of the base (3); a rotating rod (312) is rotatably connected to the inner wall of the driving chamber (31); the second motor (311) is transmission-connected to the rotating rod (312); and a driving bevel gear (313) is fixedly sleeved on the outer surface of the rotating rod (312).

4. A metal rod thread rolling device according to claim 3, characterized in that: A driving gear (315) and a driven gear (316) are provided inside the driving bin (31), and four driven gears (316) are arranged around the driving gear (315). A driven bevel gear (314) is fixedly connected to the lower end of the driving gear (315), and the driven bevel gear (314) is meshedly connected with the driving bevel gear (313). The driving gear (315) is meshedly connected with the driven gear (316), and a driven rod (317) is fixedly inserted through the center of the driven gear (316), and the driven rod (317) is inserted upward into the oil bin (32).

5. A metal rod thread rolling device according to claim 4, characterized in that: An oil inlet (324) is provided on the outer surface of the oil bin (32), and the oil inlet (324) can be closed by an end cover. A second threaded rod (321) is rotatably connected to the inner wall of the oil bin (32), and the upper end of the driven rod (317) is fixedly connected to the second threaded rod (321). The outer surface of the second threaded rod (321) is threadedly connected to the lifting plate (322), and the sponge block (323) can contact the through hole (12) upward.

6. A metal rod thread rolling device according to claim 1, characterized in that: Heat treatment before grinding the teeth specifically means that the raw materials are first heated in a salt bath furnace and then the teeth are ground using a diamond roller.

7. A metal rod thread rolling device according to claim 6, characterized in that: The raw material is W18Cr4V high-speed steel, which is ground by a grinder before heat treatment.

8. A metal rod thread rolling device according to claim 7, characterized in that: After grinding the tooth shape, the TiN coating is deposited on the surface of the thread rolling plate using the physical vapor deposition (PVD) method.

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