Digital control device and method for lower material ejecting of precision hot die forging based on heavy load

Abstract

The present application relates to high-end equipment manufacturing, in particular to a precision hot die forging lower material pushing digital control device and method based on heavy load, including a through hole arranged at the bottom of the lower die for passing different length cup rod type forgings, a floor type gear reduction mechanism, a worm and gear mechanism and an adjusting screw rod arranged on the ground directly below the die, and a digital precise adjustment of the upper material pushing height position. An automatic locking mechanism is arranged on the adjusting screw rod and interlocked with the servo motor, thereby reducing the heavy load impact and huge vibration, a balance cylinder is symmetrically arranged on the upper end of the adjusting screw rod and the machine body workbench, thereby balancing the servo motor driving torque and improving the lower material pushing digital control precision. The above integrated technical solution is combined with digital control to solve the existing technology problem of processing large size cup rod type forgings with the same diameter and different length by multiple sets of dies, to achieve the upper die forging processing of large size cup rod type forgings with the same diameter and different length by one set of die, save the die investment and replacement time, improve the production efficiency, and realize the significant effect of heavy load lower material pushing digital precise control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal forming machine tool equipment, in particular to a precision hot die forging lower material ejection digital control device and method based on heavy load. BACKGROUND

[0002] The cup rod type hot die forging part only needs to be hot die forged (or warm die forged) into shape at the head, so there are many length specifications of the same diameter size for such hot forging parts, and the length to diameter ratio is very large. Figure 7 As shown in the figure, it is a head hot die forging forming diagram of the existing long-diameter-ratio cup rod type forging part, the lower die is installed on the machine tool workbench, and the lower die is provided with a die cavity matched with the forged part, the die cavity is designed as a T shape and the lower end is a blind hole, and the existing technology needs to use a set of independent die for each length L specification of the hot forging part, which causes the die investment cost of the production enterprise to be relatively high, and the corresponding die needs to be frequently replaced during the production process according to different length hot forging parts, which seriously affects the production efficiency, and becomes a prominent technical problem that has long plagued the hot forging manufacturing enterprises in the field to improve quality, increase efficiency and reduce cost.

[0003] In particular, in recent years, with the rapid rise of the global green energy industry-strategic emerging industries such as wind power and marine equipment, China, as an industrial power of the world manufacturing base, has promoted the application of extreme manufacturing equipment, especially for the special forming processing of super large cup rod type hot forging parts (diameter φd≥50mm) hot die forging heavy load, which puts forward urgent needs for how to innovate equipment to reduce the number of dies, reduce the cost of manufacturing a single set of dies, and improve production efficiency. The heavy load die forging inevitably brings technical problems such as the increase of the strength of the machine body workbench base, the increase of the height, and the huge vibration of the heavy load impact, and further innovative technical solutions are needed for in-depth practical research. With the rise of global industrial equipment extreme manufacturing, the demand for super large size specification die forgings has increased sharply, and the promotion and application of intelligent manufacturing digital factory in the industry, it is necessary to carry out innovative research and development of high-efficiency green precision heavy load die forging metal forming basic equipment application technology.

[0004] It should be noted that the above content belongs to the technical cognition of the inventor and does not necessarily constitute prior art. SUMMARY

[0005] The present application aims to solve the problems existing in the prior art, and provides a precision hot die forging lower material ejection digital control device and method based on heavy load, which has the advantages of reasonable structure design, meets the die forging requirements of forged parts with the same diameter and different lengths through digital adjustment, saves die investment and replacement time, improves production efficiency, and realizes the remarkable effect of digital precise control of heavy load lower material ejection.

[0006] The present application achieves the above-mentioned purposes by adopting the following technical solutions:

[0007] The application discloses a digital control device for a lower material ejecting device of a precision hot die forging under heavy load, which comprises a machine body workbench, a lower die arranged on the machine body workbench, a die cavity matched with a forged piece arranged on the lower die, a through hole arranged at a lower end of the die cavity, a floor type support arranged on a foundation under the lower die, a worm gear rotatably arranged on the support, a worm connected with the worm gear, a gear reduction mechanism connected with the worm, a threaded hole arranged at a center of the worm gear, an adjusting screw vertically arranged in the threaded hole and aligned with the through hole, a light shaft section arranged at an upper portion of the adjusting screw, a threaded section arranged at a lower portion of the adjusting screw, a guide mechanism arranged on an upper end of the support and used for guiding the adjusting screw, an automatic locking mechanism arranged at a lower end of the machine body workbench and used for locking the adjusting screw, and two balance cylinders symmetrically arranged between a side wall of an upper end of the adjusting screw and the machine body workbench, wherein a stroke limiting mechanism is arranged on the support and used for limiting a stroke of the adjusting screw.

[0008] The support comprises a base arranged on the foundation, an installation base arranged at an upper end of the base, the installation base being arranged on the base through fastening bolts, the worm gear being rotatably arranged at a center of the installation base, the worm being rotatably arranged at two ends of the worm through a conical roller bearing and a gland, and a rotary encoder being arranged at a front end of the worm.

[0009] The gear reduction mechanism comprises a servo motor arranged on the installation base, a pinion connected with the servo motor, a gear connected with the pinion, and the gear being arranged at a rear end of the worm.

[0010] The guide mechanism comprises a guide sleeve arranged at the upper end of the support, a sliding bearing arranged on an inner wall of an upper end of the guide sleeve, two guide plates symmetrically arranged at the upper end of the guide sleeve, two guide planes symmetrically arranged on the adjusting screw, and the guide planes being matched with the guide plates to prevent the adjusting screw from rotating.

[0011] The automatic locking mechanism comprises a locking seat arranged at the lower end of the machine body workbench, a locking pressing plate arranged on the locking seat, one end of the locking pressing plate being integrally connected with the locking seat and the other end of the locking pressing plate being arranged in an open mode, a locking hole being arranged between the locking pressing plate and the locking seat and used for allowing the adjusting screw to pass through, and a locking drive arranged between the locking seat and the locking pressing plate arranged in an open mode.

[0012] The locking drive comprises a double-headed bolt connecting the locking pressing plate with the locking seat, a nut arranged at end portions of the double-headed bolt, a wedge block A and a wedge block B arranged on the double-headed bolt between the nut and the locking pressing plate, the wedge block B being arranged on the double-headed bolt through a thread, circular holes respectively arranged on the wedge block A and the locking pressing plate and having a diameter larger than an outer diameter of the double-headed bolt, a hydraulic oil cylinder connected with the wedge block A, the hydraulic oil cylinder or a pneumatic cylinder being arranged on the locking seat, and an electromagnetic valve connected with the hydraulic oil cylinder or the pneumatic cylinder.

[0013] The upper end of the balance cylinder is rotationally connected with the machine body workbench, and the lower end is connected with the side wall of the adjusting screw through a connecting rod.

[0014] The stroke limiting mechanism comprises a support arranged on the support, two stroke switches vertically spaced apart on the support, and a detection block arranged on the side wall of the lower end of the adjusting screw and matched with the stroke switches for limiting.

[0015] The distance between the upper end of the adjusting screw and the lower end of the lower die is S, the stroke of the balance cylinder is Y, and the distance between the two stroke switches is W, and W < S ≤ Y.

[0016] The method comprises the following steps:

[0017] S1, calculating the required distance of the adjusting screw to the lower die according to the size of the forged piece and the die forging requirements;

[0018] S2, starting the servo motor, the servo motor drives the adjusting screw to ascend and descend through the pinion gear, the gear, the worm and the worm gear, and the servo motor and the rotary encoder are matched to realize accurate adjustment of the adjusting screw;

[0019] S3, after the adjusting screw is adjusted to the position, the hydraulic oil cylinder or the air cylinder is started by controlling the electromagnetic valve, the wedge A is pulled by the hydraulic oil cylinder or the air cylinder, the wedge A drives the locking plate to press the adjusting screw under the cooperation of the wedge A and the wedge B, thereby realizing the locking of the adjusting screw, after the adjustment is completed, the forged piece is installed in the mold cavity of the lower die, the lower end of the forged piece passes through the through hole and acts on the upper end of the adjusting screw, and then the forged piece is subjected to die forging processing.

[0020] The technical scheme can bring the following beneficial effects:

[0021] (1) The unique digital control technology for the lower top material of the precision hot die forging based on heavy load is adopted, a through hole is arranged at the bottom of the traditional lower die, the requirement of passing through the cup rod type die forging with the same diameter and length is met, a floor type support, a gear reduction mechanism, a worm and worm gear mechanism and an adjusting screw are arranged on the ground directly below the die, the bearing capacity of the machine body workbench base structure under heavy load impact is significantly improved, the digital precise adjustment of the upper top material height of the cup rod type die forging with different lengths is met, the cost increase caused by the strength and space height of the machine body workbench base is reduced, and the digital control device for the lower top material of the precision hot die forging is difficult to be accurately adjusted frequently in the pit.

[0022] (2) The automatic locking mechanism is arranged on the upper part of the adjusting screw, the servo motor is interlocked and controlled to clamp and loosen, the two sides are connected with the machine body workbench base, and the floor type support jointly acts to reduce the heavy load impact and great vibration.

[0023] (3) Two balance cylinders are symmetrically set on the machine body worktable and the upper end of the adjusting screw to effectively overcome the self-weight of the adjusting screw when it rises, reduce the upward driving torque of the servo motor, and improve the accuracy of the digital control of the lower material. A bracket and limit switch are set at the lower part of the support, and a detection block is set at the lower end of the adjusting screw to meet the requirements of W<S≤Y and realize over-travel limit protection.

[0024] (4) The above-mentioned integrated innovative technical solution is organically combined with digital electromechanical-hydraulic control, which fundamentally solves the problem of forming and processing multiple sets of molds for ultra-large cup rods with the same diameter but different lengths in the existing technology. It realizes the heavy-duty forging processing of ultra-large forgings with the same diameter but different lengths on a single mold, which greatly saves mold investment and mold replacement time, improves production efficiency, and achieves the significant effect of digital and precise control of ejector material under heavy-duty impact and vibration. Attached image description:

[0025] Figure 1 This is a schematic diagram of the digital control device for the lower ejector of precision hot forging based on heavy load according to the present invention.

[0026] Figure 2 for Figure 1 BB-direction sectional view in the middle;

[0027] Figure 3 for Figure 2 Enlarged view of part B in the image;

[0028] Figure 4 For the present invention Figure 1 Enlarged view of part A in the image;

[0029] Figure 5 For the present invention Figure 1 CC-direction section view;

[0030] Figure 6 For the present invention Figure 1 DD section view in the middle;

[0031] Figure 7 This is a schematic diagram of the hot forging process of the head of an existing large aspect ratio cup rod forged part;

[0032] In the diagram, 1. Machine body worktable, 2. Lower mold, 3. Mold cavity, 4. Through hole, 5. Support, 501. Base, 502. Mounting seat, 503. Fastening bolt, 504. Adjusting shim A, 6. Worm gear, 7. Worm, 8. Gear reduction mechanism, 801. Servo motor, 802. Pinion, 803. Large gear, 9. Threaded hole, 10. Adjusting screw, 1001. Optical shaft section, 1002. Threaded section, 11. Guide mechanism, 1101. Guide sleeve, 1102. Sliding bearing, 1103. Guide plate, 1104. Guide plane, 1105. Adjusting shim B, 12. Automatic Locking mechanism, 1201, locking seat, 1202, locking pressure plate, 1203, opening, 1204, locking hole, 1205, double-ended bolt, 1206, nut, 1207, wedge A, 1208, wedge B, 1209, round hole, 1210, hydraulic cylinder or air cylinder, 13, balance cylinder, 14, stroke limit mechanism, 1401, bracket, 1402, limit switch, 1403, detection block, 15, tapered roller bearing, 16, pressure cap, 17, rotary encoder, 18, connecting rod, 19, forging, 20, foundation, 21, existing lower mold, 22, blind hole. Detailed implementation method:

[0033] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0035] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0036] In this invention, the terms "upper end", "lower end", "A", "B", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the location of the indicated technical feature.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "provided with," "set up," "connected," and "connected" should be interpreted broadly. For example, "provided with" and "set up" can refer to a fixed installation, a detachable installation, or an integral part of the device; "connected" can refer to a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] like Figures 1-6As shown, a digital control device for the lower ejector of a precision hot forging under heavy load includes a machine body worktable 1. A lower die 2 is mounted on the machine body worktable 1. The lower die 2 has a cavity 3 that matches the forging 19. The lower end of the cavity 3 is a through hole 4 (the lower end of the cavity of the existing lower die 21 is a blind hole 22). A ground-mounted support 5 is mounted on a foundation 20 below the lower die 2. A worm gear 6 is rotatably mounted on the support 5. The worm gear 6 is connected to a worm 7, and the worm 7 is connected to a gear reduction mechanism 8. The worm gear 6 has a thread at its center. Hole 9, the threaded hole 9 is vertically provided with an adjusting screw 10 aligned with the through hole 4. The upper part of the adjusting screw 10 is a smooth shaft section 1001, and the lower part is a threaded section 1002. The upper end of the support 5 is provided with a guide mechanism 11 for guiding the adjusting screw 10. The lower end of the machine body worktable 1 is provided with a locking mechanism 12 for locking the adjusting screw 10. Two balance cylinders 13 are symmetrically provided between the upper side wall of the adjusting screw 10 and the machine body worktable 1. The support 5 is provided with a stroke limiting mechanism 14 for limiting the stroke of the adjusting screw 10. Addressing the problem that existing hot forging forming processes of ultra-large cup rods of different lengths with the same diameter require multiple sets of molds, the focus is on overcoming the challenges related to the increased strength, size, and manufacturing cost of the forging machine body worktable base due to the heavy load impact and huge vibration generated by ultra-large forming. The research focuses on the applied structural technology of precision hot forging basic equipment. This innovative, heavy-load-based precision hot forging ejector digital control technology utilizes a traditional lower die 2 with a through hole 4 at the bottom to accommodate long, cup-shaped forgings of the same diameter. A floor-mounted support 5, gear reduction mechanism 8, worm gear mechanism, and adjusting screw 10 are mounted on the foundation 20 directly below the lower die 2. Compared to the base structure of the machine body worktable 1, this significantly improves the resistance to heavy-load impacts, meeting the requirements for precise digital adjustment of the ejector height for cup-shaped forgings of different lengths. This reduces the increased cost associated with the increased strength and space required for the machine body worktable 1 base, and also addresses the challenge of frequent and precise adjustments within the pit for the precision hot forging ejector digital control device. An automatic locking mechanism 12 is installed on the upper part of the adjusting screw 10, interlocking with a servo motor 801 to control clamping and releasing. Its two sides are connected to the base of the machine body worktable 1, working in conjunction with the floor-mounted device to reduce the significant vibrations caused by heavy-load impacts. A balance cylinder 13 is symmetrically arranged at the lower part of the machine body worktable 1 and the upper end of the adjusting screw 10 to effectively overcome the self-weight of the adjusting screw 10 when it rises, reduce the upward driving torque of the servo motor 801, and improve the accuracy of the digital control of the lower material ejection. A limit mechanism 14 is set at the lower part of the support 5 to meet the condition W<S≤Y and perform over-travel limit protection.The aforementioned integrated innovative technology solution, combined with digital electromechanical-hydraulic control, fundamentally solves the problem of forming and processing ultra-large cup rods of the same diameter but different lengths using multiple sets of molds in existing technologies. It enables heavy-duty forging processing of ultra-large forgings of the same diameter but different lengths to be completed on a single mold, greatly saving mold investment and mold replacement time, improving production efficiency, and achieving the remarkable effect of digital and precise control of ejector pins in precision hot forging under heavy-duty impact and vibration.

[0039] The support 5 includes a base 501 mounted on the foundation 20. A mounting seat 502 is provided at the upper end of the base 501. The mounting seat 502 is mounted on the base 501 by fastening bolts 503. In practical applications, an adjusting shim A504 is also provided between the mounting seat 502 and the base 501. The worm gear 6 is rotatably mounted at the center of the mounting seat 502. The worm 7 is rotatably mounted at both ends via tapered roller bearings 15 and pressure caps 16, respectively. A rotary encoder 17 is provided at the front end of the worm 7. Further defining the structure of the support 5, the support 5 is constructed from a separate base 501 and mounting seat 502, facilitating the installation of each component.

[0040] The gear reduction mechanism 8 includes a servo motor 801 mounted on a mounting base 502. The servo motor 801 is connected to a pinion 802, and the pinion 802 is connected to a large gear 803. The large gear 803 is located at the rear end of the worm gear 7. Gear transmission is used to reduce speed, thereby slowing down the speed and increasing the output torque.

[0041] The guiding mechanism 11 includes a guide sleeve 1101 disposed on the upper end of the support 5. In actual application, an adjusting shim B1105 is disposed between the guide sleeve 1101 and the support 5. A sliding bearing 1102 is disposed on the inner wall of the upper end of the guide sleeve 1101. Two guide plates 1103 are symmetrically disposed on the upper end of the guide sleeve 1101, and two guide planes 1104 are symmetrically disposed on the corresponding adjusting screw 10. The guide planes 1104 cooperate with the guide plates 1103 to prevent the adjusting screw 10 from rotating. The sliding bearing 1102 guides the adjusting screw 10 vertically, and the guide plates 1103 and guide planes 1104 prevent the adjusting screw 10 from rotating.

[0042] The automatic locking mechanism 12 includes a locking seat 1201 disposed at the lower end of the machine body worktable 1. A locking pressure plate 1202 is provided on the locking seat 1201. One end of the locking pressure plate 1202 is integrally connected to the locking seat 1201, and the other end is provided with an opening 1203. A locking hole 1204 for the adjusting screw 10 to pass through is provided between the locking pressure plate 1202 and the locking seat 1201. A locking driver is provided between the end of the locking pressure plate 1202 with the opening 1203 and the locking seat 1201.

[0043] The locking actuator includes a double-ended bolt 1205 connecting the locking pressure plate 1202 to the locking seat 1201. A nut 1206 is provided at the end of the double-ended bolt 1205. A wedge block A1207 and a wedge block B1208 are provided on the double-ended bolt 1205 between the nut 1206 and the locking pressure plate 1202. The wedge block B1208 is threaded onto the double-ended bolt 1205. A circular hole 1209 is provided on both the wedge block A1207 and the locking pressure plate 1202. The diameter of the circular hole 1209 is larger than the outer diameter of the double-ended bolt 1205. A hydraulic cylinder or air cylinder 1210 is connected to the wedge block A1207. The hydraulic cylinder or air cylinder 12010 is mounted on the locking seat 1201 and is connected to a solenoid valve. An automatic locking mechanism 12 is given. It uses a solenoid valve to control the locking actuator to clamp and release the adjusting screw 10. It is interlocked with the servo motor 801 and works together with the floor support to reduce the huge vibration of heavy load impact.

[0044] The upper end of the balancing cylinder 13 is rotatably connected to the machine body worktable 1, and the lower end is connected to the side wall of the adjusting screw 10 through the connecting rod 14. The specific installation structure of the balancing cylinder 13 is given, which effectively overcomes the self-weight of the adjusting screw 10 when it rises, reduces the upward driving torque of the servo motor 801, and helps to improve the accuracy of the digital control of the lower ejector.

[0045] The travel limiting mechanism 14 includes a bracket 1401 mounted on the support 5. Two limit switches 1402 are vertically spaced on the bracket 1401. A detection block 1403, which cooperates with the limit switches 1402 to limit the movement of the adjusting screw 10, is provided on the lower side wall of the adjusting screw 10. This mechanism precisely limits the lifting and lowering range of the adjusting screw 10, ensuring proper installation and operation.

[0046] The distance between the upper end of the adjusting screw 10 and the lower end of the lower mold 2 is S, the stroke of the balancing cylinder 13 is Y, the distance between the two limit switches 1402 is W, and W < S ≤ Y.

[0047] A digital control method for the lower ejector of precision hot forging based on heavy load, including the aforementioned digital control device for the lower ejector of precision hot forging based on heavy load, includes the following steps:

[0048] S1. Calculate the distance required from the adjusting screw 10 to the lower die based on the dimensions of the forging 19 and the end requirements;

[0049] S2. Start the servo motor 801. The servo motor 801 drives the adjusting screw 10 to rise and fall through the pinion 802, the large gear 803, the worm 7 and the worm wheel 8. By controlling the servo motor 801 and cooperating with the rotary encoder 17, the precise adjustment of the adjusting screw 10 can be achieved.

[0050] S3. After the adjusting screw 10 is adjusted to the correct position, the hydraulic cylinder or air cylinder 1210 is activated by controlling the solenoid valve. The hydraulic cylinder or air cylinder 1210 pulls the wedge block A1207. With the cooperation of the wedge block A1207 and the wedge block B1208, the locking plate 1202 is driven to press the adjusting screw 10, thereby locking the adjusting screw 10. After the adjustment is completed, the forging 19 is installed in the mold cavity 3 of the lower mold 2. The lower end of the forging 19 passes through the through hole 4 and acts on the upper end of the adjusting screw 10. Then, the forging is forged.

[0051] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0052] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A digital control device for the ejector pin in precision hot forging under heavy load, characterized in that, The machine includes a machine body worktable, on which a lower mold is provided. The lower mold has a cavity that matches the forging, and the lower end of the cavity is a through hole. A floor-mounted support is provided on the foundation below the lower mold. A worm gear is rotatably mounted on the support. The worm gear is connected to a worm, and the worm is connected to a gear reduction mechanism. The worm gear has a threaded hole at its center. An adjusting screw, aligned vertically with the through hole, is provided on the threaded hole. The upper part of the adjusting screw is a smooth shaft section, and the lower part is a threaded section. A guide mechanism is provided at the upper end of the support to guide the adjusting screw. An automatic locking mechanism is provided at the lower end of the machine body worktable to lock the adjusting screw. Two symmetrical balance cylinders are provided between the upper side wall of the adjusting screw and the machine body worktable. A stroke limiting mechanism is provided on the support to limit the stroke of the adjusting screw. The automatic locking mechanism includes a... At the lower end of the machine body's worktable is a locking seat, on which a locking pressure plate is provided. One end of the locking pressure plate is integrally connected to the locking seat, and the other end is open. A locking hole for an adjusting screw to pass through is provided between the locking pressure plate and the locking seat. A locking actuator is provided between the open end of the locking pressure plate and the locking seat. The locking actuator includes a double-ended bolt connecting the locking pressure plate and the locking seat. A nut is provided at the end of the double-ended bolt. Wedge A and wedge B are provided on the double-ended bolt between the nut and the locking pressure plate. Wedge B is threaded onto the double-ended bolt. Wedge A and the locking pressure plate are respectively provided with round holes. The diameter of the round holes is larger than the outer diameter of the double-ended bolt. A hydraulic cylinder or air cylinder is connected to wedge A. The hydraulic cylinder or air cylinder is installed on the locking seat and is connected to a solenoid valve.

2. The digital control device for the lower ejector of precision hot forging based on heavy load as described in claim 1, characterized in that, The support includes a base set on the foundation, a mounting seat at the upper end of the base, the mounting seat being mounted on the base by fastening bolts, a worm gear rotatably mounted at the center of the mounting seat, the two ends of the worm being rotatably mounted by tapered roller bearings and pressure caps respectively, and a rotary encoder being mounted at the front end of the worm.

3. The digital control device for the lower ejector of precision hot forging based on heavy load as described in claim 2, characterized in that, The gear reduction mechanism includes a servo motor mounted on a mounting base, the servo motor being connected to a pinion, the pinion being connected to a large gear, and the large gear being located at the rear end of the worm gear.

4. The digital control device for the lower ejector of precision hot forging based on heavy load as described in claim 3, characterized in that, The guiding mechanism includes a guide sleeve disposed on the upper end of the support. A sliding bearing is provided on the inner wall of the upper end of the guide sleeve. Two guide plates are symmetrically disposed on the upper end of the guide sleeve. Two guide planes are symmetrically disposed on the corresponding adjusting screw. The guide planes cooperate with the guide plates to prevent the adjusting screw from rotating.

5. The digital control device for the lower ejector of precision hot forging based on heavy load as described in claim 4, characterized in that, The upper end of the balance cylinder is rotatably connected to the machine body worktable, and the lower end is connected to the side wall of the adjusting screw through a connecting rod.

6. The digital control device for the lower ejector of precision hot forging based on heavy load as described in claim 5, characterized in that, The travel limiting mechanism includes a bracket mounted on the support, two travel switches are vertically spaced on the bracket, and a detection block that cooperates with the travel switches to limit the travel on the lower side wall of the adjusting screw.

7. The digital control device for the lower ejector of precision hot forging based on heavy load as described in claim 6, characterized in that, The distance between the upper end of the adjusting screw and the lower end of the lower mold is S, the stroke of the balancing cylinder is Y, the distance between the two limit switches is W, and W < S ≤ Y.

8. A digital control method for ejector pins in precision hot forging under heavy load, characterized in that, The digital control device for the lower ejector of precision hot forging based on heavy load as described in claim 7, wherein the control method includes the following steps: S1. Calculate the distance required from the adjusting screw to the lower die based on the forging dimensions and die forging requirements; S2. Start the servo motor. The servo motor drives the adjustment screw to rise and fall through the pinion, gear, worm, and worm wheel. By controlling the servo motor and cooperating with the rotary encoder, the rise and fall of the adjustment screw can be precisely adjusted. S3. After the adjusting screw is adjusted to the correct position, start the hydraulic cylinder or air cylinder by controlling the solenoid valve. The hydraulic cylinder or air cylinder pulls wedge A. With the cooperation of wedge A and wedge B, the locking plate is driven to press the adjusting screw. After the adjustment is completed, install the forging in the mold cavity of the lower mold. The lower end of the forging passes through the through hole and acts on the upper end of the adjusting screw. Then, the forging can be die forged.

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