Double-station steel ball pre-forging hydraulic machine and forging method

Abstract

The invention relates to the technical field of steel ball forging, in particular to a double-station steel ball pre-forging hydraulic press and a forging method.The double-station steel ball pre-forging hydraulic press comprises an intermittent conveying roller way and a machine body, the machine body is a double-station horizontal hydraulic press, and the intermittent conveying roller way is provided with double roller ways; two roller ways of the intermittent conveying roller way correspond to two stations of the double-station horizontal hydraulic machine in a one-to-one mode respectively, rapid hot shearing devices are arranged on the two sides of the machine body respectively, two material supporting devices are correspondingly arranged on the portion, between the two rapid hot shearing devices, of the machine body, and after the material supporting devices press bars, the rapid hot shearing devices cut off the bars. According to the integrated intermittent feeding system of the double-station horizontal forging hydraulic press, integration of online intermittent feeding, hot shearing, material supporting and feeding is achieved, waiting time is not needed for the return stroke of the hydraulic press, and high integration of the whole line is achieved. And by adopting a non-sawing mode, the energy efficiency and the material utilization rate are improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of forged steel balls, and in particular to a double-station steel ball pre-forging hydraulic press and a forging method. Background Art

[0002] Rolled and cast steel balls are used in grinding and mixing equipment in construction, agriculture, light industry and other fields with low performance requirements, while forged steel balls can be used not only in construction, agriculture, light industry, but also in mining, metallurgy, bearings and other fields with high performance requirements for steel balls. Forged steel balls have finer internal grains, good metal flow lines, good toughness, impact resistance and wear resistance, dense organization, fewer defects, better dimensional accuracy and surface finish, and the service life of forged steel balls is much better than that of rolled steel balls.

[0003] Steel balls with a diameter of 20-125mm can generally be formed by using a steel ball oblique rolling mill and a vertical forging hydraulic press. Large diameter steel balls with a diameter of 130-250mm are difficult to form by using an oblique rolling mill. In areas where the mechanical properties and life of steel balls are not required to be high, forging technology is more advantageous for steel balls with a diameter of more than 100mm due to cost and part performance considerations. Forging production lines with a cycle of more than 15 pieces / minute can reduce this diameter to 90mm. In areas where the mechanical properties and life of steel balls are required to be high, forging technology can only be used.

[0004] Forged steel balls have excellent performance, good wear resistance and long service life. Their replacement cost and maintenance cost are lower. Generally, steel balls with a diameter of more than 100 mm have cost advantages in terms of long-term use. At present, forged steel balls generally adopt the process of natural gas furnace heating → high-pressure water dephosphorization → rod shear cutting → hydraulic press pre-forging → electro-hydraulic hammer finishing. The overall process is relatively long and intermittent forming. Compared with rolled steel balls, forged steel balls have higher production equipment investment costs and lower production efficiency. The production efficiency of a single machine is generally within 7 pieces / minute, while oblique rolling can reach more than 40 pieces / minute.

[0005] The existing traditional single-station vertical forging production line has reached a bottleneck in production efficiency due to the use of offline cutting and robot loading. In addition, since steel ball manufacturing is carried out at high temperatures, its energy consumption and material loss are issues that cannot be ignored. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a double-station steel ball pre-forging hydraulic press and forging method. The present invention is a double-station horizontal forging hydraulic press integrated with an intermittent feeding system, which realizes the integration of online intermittent feeding, hot shearing, supporting and loading, and can realize the return of the hydraulic press without waiting time, realizing the high integration of the whole line. It achieves the purpose of accelerating production efficiency, improving energy efficiency and material utilization by non-sawing methods, and reducing costs.

[0007] The present invention is achieved through the following technical solutions:

[0008] A double-station steel ball pre-forging hydraulic press comprises an intermittent conveying roller and a machine body. The machine body adopts a double-station horizontal hydraulic press. The intermittent conveying roller has a double roller. The two rollers of the intermittent conveying roller correspond to the two stations of the double-station horizontal hydraulic press respectively. Rapid hot shearing devices are respectively arranged on both sides of the machine body. Two supporting devices are correspondingly arranged on the machine body between the two rapid hot shearing devices. After the supporting device presses the bar material, the rapid hot shearing device shears the bar material.

[0009] The hydraulic press adopts a double-station short-stroke combined prestressed structure to ensure good rigidity of the machine body and good anti-eccentric load characteristics. The horizontal double-station structure ensures high production efficiency and good front-end and back-end integration matching. The main cylinder adopts a built-in displacement sensor to effectively ensure the forming accuracy.

[0010] Further preferably, the material supporting device includes a lifting guide rail installed on the fuselage, a lifting block is slidably provided on the lifting guide rail, a material supporting swing arm is rotatably connected to the lifting block, one end of the material supporting swing arm is connected to a tension spring arranged on the lifting block, and the other end of the material supporting swing arm is provided with a pressing block for abutting and pressing the rod material, and a wedge block is provided at the bottom of the lifting block.

[0011] Further preferably, the rapid hot shearing device comprises an oil cylinder and a shearing knife connected to an output end of the oil cylinder, a main oil cylinder is arranged in the body, and a sliding block is arranged at the output end of the main oil cylinder.

[0012] The material support device is driven by a slider to lift and self-reset. The fast hot shear device drives the material pressing swing and the tension spring to swing and reset. It is an under-driven device and does not require additional power. The fast hot shear device is driven by a cylinder and servo controlled. The shear curve can be set to achieve a smooth motion curve while ensuring high-speed shearing requirements, ensuring the flatness of the cut section and minimal impact during cutting.

[0013] Further preferably, a material beating device is provided on one side of the material supporting device, and a material discharge chute is provided on the machine body. The material beating device is used to eject the workpiece onto the material discharge chute and slide out of the machine body after the pressing is completed.

[0014] Further preferably, a material pressing device is mounted on the intermittent conveying roller, the material pressing device comprises a support frame, a lifting member is provided on the top of the support frame, a roller is provided at the bottom end of the lifting member, and the material pressing device is used to press rods of different diameters.

[0015] Further preferably, the intermittent conveying roller is provided with a heat preservation system for maintaining a stable temperature during the rod conveying process.

[0016] The intermittent conveying roller belt insulation system and the automatic adjustment roller pressing device can realize the continuous and intermittent conveying of bar materials, temperature maintenance, pressing and straightening, and fixed-length feeding.

[0017] Further preferably, the double-station steel ball pre-forging hydraulic press also includes a hydraulic system and a maintenance platform, and the hydraulic system is installed on the maintenance platform to provide hydraulic pressure for the entire hydraulic press.

[0018] A forging method for a double-station steel ball pre-forging hydraulic press comprises the following steps: a long bar heated by a preceding heating furnace is conveyed to a double-station horizontal hydraulic press through an intermittent conveying roller and a pressing device to realize feeding of the hydraulic press; during the conveying process, a heat preservation system maintains the temperature of the heated bar stable, and an inert gas is introduced for atmosphere protection; after the bar is conveyed to the machine body, a lateral rapid hot shearing device quickly shears the bar with a shearing knife driven by an oil cylinder, a pressing block of a supporting device presses the cut blank, and the cut bar is sent to a forming station through a pushing device of the rapid hot shearing device to realize precise positioning; then the rapid hot shearing device retreats and returns to its original position, a slider of the double-station horizontal hydraulic press advances rapidly, and the supporting device is lifted and opened, the blank is pressed into a lower die, and pressed and formed; after the pressing is completed, the slider retreats rapidly, a punching device pushes out a workpiece, and the workpiece slides to a lower material slideway until it rolls out of the hydraulic press, the punching device retreats, the supporting device is reset to its initial state, and production is cyclically performed.

[0019] Beneficial effects of the present invention:

[0020] 1) The double roller conveying insulation system of the present invention is seamlessly connected with the double-station horizontal forging press, abandoning the traditional offline rod shearing process and adopting the double-station high-speed online shearing, supporting and feeding integrated technology, which greatly improves the shearing and feeding time. The supporting device is used to improve the feeding positioning accuracy. At the same time, the press stroke can be reduced, the idle time can be reduced, and the forming cycle is not less than 20 pieces / minute.

[0021] 2) The present invention integrates the double roller conveying and heat preservation system into the pre-heating furnace and the post-forging press production line, which greatly improves the temperature drop of the blank during the transmission process, reduces the energy consumption of the production line, and reduces forming defects. For easily oxidized metals, the double roller conveying and heat preservation system can be introduced with inert gas to reduce the generation of oxide scale.

[0022] 3) The double-station steel ball pre-forging horizontal hydraulic press of the present invention has a short stroke and a compact shape, which greatly improves production efficiency while reducing the footprint. The material is discharged by ejecting the material and discharging the material through an inclined slide, which can improve efficiency and distribute the material for the next sequence of air hammer forging.

[0023] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 The invention discloses a structural schematic diagram of a double-station steel ball pre-forging hydraulic press.

[0026] Figure 2 The invention discloses a top view structural schematic diagram of a machine body and an intermittent conveying roller in a double-station steel ball pre-forging hydraulic press.

[0027] Figure 3 The invention discloses a structural schematic diagram of a material supporting device and a rapid hot shearing device in a double-station steel ball pre-forging hydraulic press.

[0028] 1-intermittent conveying roller, 2-insulation system, 3-pressing device, 4-fast hot shearing device, 5-supporting device, 6-beating device, 7-forging die, 8-fuselage, 9-main cylinder, 10-hydraulic system, 11-inspection platform, 12-unloading slide, 13-slider, 14-cylinder, 15-shearing knife, 16-bar, 17-lifting guide rail, 18-lifting block, 19-supporting swing arm, 20-tension spring, 21-pressing block, 22-wedge block, 23-shearing position, 24-loading position. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] Please refer to Figure 1-3A double-station steel ball pre-forging hydraulic press comprises an intermittent conveying roller 1, a heat preservation system 2, a pressing device 3, a rapid hot shearing device 4, a supporting device 5, a beating device 6, a forging die 7, a fuselage 8, a main oil cylinder 9, a hydraulic system 10, a maintenance platform 11 and a material unloading slide 12. The hydraulic press adopts a double-station horizontal hydraulic press. The intermittent conveying roller 1 is installed on one side of the hydraulic press fuselage 8. The intermittent conveying roller 1 preferably adopts a double roller. The two rollers of the intermittent conveying roller 1 correspond to the two stations of the hydraulic press. The bar 16 is conveyed to the double-station horizontal hydraulic press for forging through the intermittent conveying roller 1 to realize double-station forging.

[0034] A pressing device 3 is mounted on the intermittent conveyor roller 1. The pressing device 3 is used to cooperate with the intermittent conveyor roller 1 to convey the bar 16. Preferably, the pressing device 3 has a lifting function. For example, the pressing device 3 includes a support frame, a lifting member is provided on the top of the support frame, and a roller is provided at the bottom of the lifting member. The lifting roller is used to press the bar 16 of different diameters through the lifting member. The roller-type pressing device 3 integrated in the intermittent conveyor roller 1 can realize the fixed-length feeding and positioning of the bar 16, ensure the stability of the feeding length and the straightening of the bar 16, and the pressing device 3 can be raised and lowered to match more bar 16 diameters.

[0035] The intermittent conveyor roller 1 is provided with a heat preservation system 2, which is used to seal the space above the intermittent conveyor roller 1, so as to keep the temperature of the bar 16 stable during the conveying process and prevent the temperature of the heated bar 16 from being lost. The heat preservation system 2 has a certain sealing performance, which can effectively prevent the temperature of the heated bar 16 from being lost and ensure the stability of the product; inert gas can also be introduced to achieve atmosphere protection to prevent special materials from being oxidized.

[0036] The body 8 of the hydraulic press is equipped with conventional parts of the hydraulic press such as the main oil cylinder 9, the slide block 13, the forging die 7, etc., and rapid hot shear devices 4 are respectively arranged on both sides of the body 8 for cutting the bar stock 16. The rapid hot shear device 4 has conventional structures such as the oil cylinder 14 and the shear knife 15. Two supporting devices 5 are correspondingly arranged on the body 8 between the two rapid hot shear devices 4. The supporting device 5 is used to support and hold the bar stock 16, and then the rapid hot shear device 4 cuts the bar stock 16. A punching device 6 is arranged on one side of the supporting device 5 for ejecting the workpiece after the pressing is completed, and sliding out of the body 8 from the unloading chute 12 in the body 8. The hydraulic system 10 is installed on the maintenance platform 11, and the hydraulic system 10 provides hydraulic pressure for the entire hydraulic press. The fast hot shearing device 4 and the material supporting device 5 can realize online fast sizing shearing, support of the blank after shearing and fast feeding, with basically no material waste. The online shearing and feeding of the bar material 16 are both in the return time period of the slider 13. The shearing and feeding are seamlessly connected, and the feeding stroke is short, which can greatly improve the efficiency and feeding accuracy.

[0037] The material supporting device 5 includes a lifting rail 17 installed on the fuselage 8, a lifting block 18 is slidably provided on the lifting rail 17, a material supporting swing arm 19 is rotatably connected to the lifting block 18, one end of the material supporting swing arm 19 is connected to a tension spring 20 provided on the lifting block 18, and a material pressing block 21 is provided at the other end of the material supporting swing arm 19 for abutting against and pressing the bar material 16, and a wedge block 22 is provided at the bottom of the lifting block 18. The material supporting device 5 is a linkage mechanism with the slider 13 and the fast hot shear device 4. The wedge block 22 of the supporting device 5 is at the lower limit position, the pressing block 21 at one end of the supporting swing arm 19 presses the blank at the shearing position 23, the shearing knife 15 of the rapid hot shearing device 4 extends, cuts the bar 16, and pushes the cut blank to the loading position 24; the slider 13 advances and presses, the slider 13 drives the wedge block 22 of the supporting device 5 to rise, the pressing block 21 rises and separates from the blank, the rapid hot shearing device 4 retreats, presses and forms, the slider 13 returns, the formed steel ball rolls down, and the supporting swing arm 19 is reset by the tension spring 20; the slider 13 retreats, the wedge block 22 of the supporting device 5 falls by its own weight, and the pressing block 21 presses the bar 16 to carry out the next cycle. The power source of the supporting device 5 is the hydraulic press slider 13 and the rapid hot shearing device 4 oil cylinder 14, no additional power is required, the control difficulty is reduced, the linkage operation is improved, and the efficiency and coordination are improved.

[0038] A forging method of a double-station steel ball pre-forging hydraulic press of the present invention:

[0039] The long bar material 16 heated by the previous heating furnace is transported to the double-station horizontal hydraulic press through the intermittent conveying roller 1 and the roller pressing device 3 to realize the feeding of the hydraulic press; the lateral fast hot shearing device 4 quickly cuts the bar material 16, the supporting device 5 presses the cut blank, and the sheared bar material 16 is sent to the forming station through the fast hot shearing device 4 to achieve precise positioning; the fast hot shearing device 4 retreats and returns to its original position, the double-station horizontal hydraulic press slider 13 advances quickly, and the supporting device 5 is lifted and opened, the blank is pressed into the lower die, and pressed into shape; after the pressing is completed, the hydraulic press slider 13 retreats quickly, the punching device 6 pushes out the workpiece, and the workpiece slides to the unloading slide 12 until it rolls out of the hydraulic press. The punching device 6 retreats, the supporting device 5 is reset to the initial state, and the production cycle is repeated.

[0040] The double-station steel ball pre-forging hydraulic press of the present invention solves the problems of low production efficiency and short service life of large-diameter (130-250mm) steel balls, low product qualification rate and high production cost caused by rapid temperature drop during workpiece forming, and reduces the equipment footprint at the same time, and can be quickly and seamlessly connected with a preceding heating furnace and a subsequent final forging air hammer.

[0041] The steel ball forming of the present invention adopts a double-station horizontal extruder and a single-side / double-side discharge form. The double-stations are pressed and formed simultaneously, which can not only greatly improve the efficiency, but also improve the compatibility of the front and back sequences, and it is easier to realize the change of different steel ball varieties. Short-range rapid pressing ensures that the qualified rate of pressed steel ball products is high, and the whole machine occupies a small area. The supporting device 5 is a linkage mechanism with the slider 13 and the rapid hot shear device 4. When the slider 13 is pressed, the slider 13 drives the wedge block 22 of the supporting device 5 to rise, the pressing block 21 rises and separates from the steel ball, the steel ball rolls off, the rapid hot shear device 4 retreats, and the supporting swing arm 19 is reset by the tension spring 20; the slider 13 retreats, the wedge block 22 of the supporting device 5 falls by its own weight, and the pressing block 21 presses the bar 16 to carry out the next cycle. The power source of the supporting device 5 is the hydraulic press slider 13 and the oil cylinder 14 of the rapid hot shear device 4, and no additional power is required, which reduces the control difficulty, and the linkage operation improves the efficiency and coordination.

[0042] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A double-station steel ball pre-forging hydraulic press, characterized in that: The invention comprises an intermittent conveying roller (1) and a machine body (8), wherein the machine body (8) adopts a double-station horizontal hydraulic press, the intermittent conveying roller (1) has a double roller, and the two rollers of the intermittent conveying roller (1) correspond to the two stations of the double-station horizontal hydraulic press respectively, and the machine body (8) is provided with a rapid hot shearing device (4) on both sides, and two supporting devices (5) are correspondingly provided on the machine body (8) between the two rapid hot shearing devices (4), and after the supporting device (5) presses the bar material (16), the rapid hot shearing device (4) cuts the bar material (16).

2. A double-station steel ball pre-forging hydraulic press according to claim 1, characterized in that: The material supporting device (5) comprises a lifting guide rail (17) installed on the machine body (8), a lifting block (18) is slidably provided on the lifting guide rail (17), a material supporting swing arm (19) is rotatably connected to the lifting block (18), one end of the material supporting swing arm (19) is connected to a tension spring (20) provided on the lifting block (18), and the other end of the material supporting swing arm (19) is provided with a pressing block (21) for abutting and pressing the rod material (16), and a wedge block (22) is provided at the bottom of the lifting block (18).

3. A double-station steel ball pre-forging hydraulic press according to claim 2, characterized in that: The rapid hot shearing device (4) comprises an oil cylinder (14) and a shearing knife (15) connected to the output end of the oil cylinder (14); a main oil cylinder (9) is arranged in the machine body (8); and a sliding block (13) is arranged at the output end of the main oil cylinder (9).

4. A double-station steel ball pre-forging hydraulic press according to claim 1, characterized in that: A material beating device (6) is provided on one side of the material supporting device (5), and the machine body (8) is provided with a material discharge chute (12). The material beating device (6) is used to eject the workpiece onto the material discharge chute (12) and slide out of the machine body (8) after pressing is completed.

5. A double-station steel ball pre-forging hydraulic press according to claim 1, characterized in that: A material pressing device (3) is mounted on the intermittent conveying roller (1), and the material pressing device (3) comprises a support frame, a lifting member is arranged on the top of the support frame, and a roller is arranged at the bottom end of the lifting member. The material pressing device (3) is used to press rods (16) of different diameters.

6. A double-station steel ball pre-forging hydraulic press according to claim 5, characterized in that: The intermittent conveying roller (1) is provided with a heat preservation system (2) for maintaining the temperature stability of the bar material (16) during the conveying process.

7. A double-station steel ball pre-forging hydraulic press according to claim 1, characterized in that: The double-station steel ball pre-forging hydraulic press also includes a hydraulic system (10) and a maintenance platform (11). The hydraulic system (10) is installed on the maintenance platform (11) and is used to provide hydraulic pressure for the entire hydraulic press.

8. A forging method of a double-station steel ball pre-forging hydraulic press, characterized in that: The long bar material (16) heated by the preceding heating furnace is conveyed to the double-station horizontal hydraulic press through the intermittent conveying roller (1) and the pressing device (3) to realize the feeding of the hydraulic press; during the conveying process, the heat preservation system (2) maintains the temperature of the heated bar material (16) stable, and inert gas is introduced for atmosphere protection; after the bar material (16) is conveyed to the machine body (8), the lateral rapid hot shearing device (4) drives the oil cylinder (14) to quickly cut the bar material (16) with the shear knife (15), and the pressing block (21) of the supporting device (5) presses the cut blank, and the cut blank is quickly cut. The hot shearing device (4) pushes the cut bar material (16) to the forming station to achieve precise positioning; then the hot shearing device (4) quickly retreats and returns to its original position, the slide block (13) of the double-station horizontal hydraulic press quickly advances, and the supporting device (5) is lifted and opened, the blank is pressed into the lower die, and pressed and formed; after the pressing is completed, the slide block (13) quickly retreats, the punching device (6) pushes the workpiece out, and the workpiece slides to the unloading slideway (12) until it rolls out of the hydraulic press, the punching device (6) retreats, the supporting device (5) resets to its initial state, and the production cycle is repeated.

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