An external cylindrical rolling mill

Abstract

This invention provides an external cylindrical rolling mill, including a bed, a clamping mechanism at one end of the bed, and a spindle mechanism at the other end. A cross worktable is provided on the bed corresponding to the position between the clamping mechanism and the spindle mechanism. The lower layer of the cross worktable is slidably mounted on the bed. A first drive assembly is provided on the bed for moving the cross worktable between the clamping mechanism and the spindle mechanism. A rolling mechanism and a loading / unloading mechanism are provided on the upper layer of the cross worktable, and the rolling mechanism and the loading / unloading mechanism are arranged on the left and right sides of the bed, with a receiving gap between the rolling mechanism and the loading / unloading mechanism for accommodating the workpiece to be processed. The external cylindrical rolling mill of this invention has the advantages of simple structure, easy operation, good rolling accuracy, and high efficiency.

Description

Technical Field

[0001] This invention belongs to the field of rolling mill technology, and in particular relates to an external cylindrical rolling mill. Background Technology

[0002] Roller burnishing improves the hardness, wear resistance, fatigue life, and corrosion resistance of metal surfaces by applying pressure. It can also generate stress on the surface, increasing the tensile strength and fatigue strength of the material. Furthermore, roller burnishing can eliminate surface defects and cracks, improving surface finish and smoothness. However, roller burnishing equipment is used in relatively small quantities. Currently, most external cylindrical roller burnishing equipment is manually operated, making it difficult to control the burnishing speed, resulting in slow workpiece clamping and inconsistent burnishing stroke. Conventional feeding mechanisms generally lack movement accuracy and operational stability, failing to meet the workpiece clamping precision requirements of roller burnishing equipment. This necessitates operators remaining physically present during the burnishing process, manually handling and adjusting workpieces, leading to high labor intensity. Therefore, existing roller burnishing machines suffer from inconvenience and hinder the improvement of workpiece burnishing efficiency. Summary of the Invention

[0003] In view of this, the present invention aims to provide an external cylindrical rolling mill to solve the problems of existing methods.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: An external cylindrical rolling mill includes a bed, with a clamping mechanism at one end and a spindle mechanism at the other end. A cross worktable is provided on the bed at a position corresponding to the clamping mechanism and the spindle mechanism. The lower layer of the cross worktable is slidably mounted on the bed. A first drive assembly is provided on the bed to move the cross worktable between the clamping mechanism and the spindle mechanism. A rolling mechanism and a loading / unloading mechanism are provided on the upper layer of the cross worktable. The rolling mechanism and the loading / unloading mechanism are arranged on the left and right sides of the bed, and there is a receiving gap between the rolling mechanism and the loading / unloading mechanism for accommodating the workpiece to be processed.

[0005] Furthermore, the rolling mechanism includes a mounting bracket disposed on the upper part of the cross worktable, a rolling block disposed on the mounting bracket, the rolling block being slidably mounted on the mounting bracket, and a second driving component disposed on the mounting bracket for driving the rolling block to move toward the workpiece to be processed; a rolling wheel is disposed on one end of the rolling block facing the workpiece to be processed, and the rolling wheel is rotatably mounted on the rolling block.

[0006] Furthermore, the rolling block is slidably mounted on the mounting bracket via a linear guide rail, and the second drive assembly includes a hydraulic cylinder, the fixed end of which is disposed on the mounting bracket, and the telescopic end is connected to the rolling block.

[0007] Furthermore, at least three rolling blocks are arranged at intervals along the circumference of the workpiece to be processed.

[0008] Furthermore, the mounting bracket has a receiving groove on the side facing the loading and unloading mechanism for accommodating the workpiece to be processed, and the receiving groove is connected to the receiving gap.

[0009] Furthermore, the loading and unloading mechanism includes an equipment support mounted on the upper layer of the cross-shaped worktable, on which a loading rack and a receiving tray are arranged sequentially from top to bottom; the loading rack has an assembly slot for accommodating the workpiece to be processed on the side facing the rolling mechanism, and the loading rack is provided with an adjustment component for adjusting the height of the workpiece to be processed; the receiving tray is inclinedly mounted on the equipment support, and the upward-sloping side of the receiving tray corresponds to the assembly slot of the loading rack.

[0010] Furthermore, a hopper that can cooperate with the loading rack is provided on the lower layer of the cross worktable at the position above the loading rack. A material discharge port is provided below the hopper, and an inclined surface is provided inside the hopper. The inclined surface is oriented downwards towards the material discharge port. A telescopic cylinder is provided above the hopper at the position corresponding to the material discharge port. The fixed end of the telescopic cylinder is provided on the hopper, and the telescopic end is provided with a pressing block. The pressing block is provided with a contour groove that can cooperate with the workpiece to be processed.

[0011] Furthermore, the adjustment assembly includes an adjustment seat and a telescopic rod. The adjustment seat is slidably mounted on the loading rack, and the side of the adjustment seat facing the rolling mechanism is provided with an installation groove that mates with the workpiece to be processed. One end of the telescopic rod is connected to the loading rack, and the other end is connected to the adjustment seat.

[0012] Furthermore, the feeding rack is provided with two guide columns spaced apart, and the adjusting seat is provided with strip-shaped holes that slide with the guide columns. Each strip-shaped hole is inclinedly arranged on the adjusting seat. One end of the telescopic rod is rotatably mounted on the feeding rack, and the other end is rotatably connected to the adjusting seat.

[0013] Furthermore, the lower layer of the cross-shaped worktable is provided with a third drive assembly for driving the upper layer of the cross-shaped worktable to move.

[0014] Compared with the prior art, the external cylindrical rolling mill of the present invention has the following advantages: The external cylindrical rolling mill of this invention has the advantages of simple structure, easy operation, good rolling accuracy, and high efficiency. By setting up a loading and unloading mechanism, stable loading and unloading of the workpiece can be achieved, which not only reduces the labor intensity of operators but also ensures the clamping and fixing accuracy of the workpiece, thus facilitating further improvement of the rolling accuracy of the rolling mechanism. Furthermore, by setting both the rolling mechanism and the loading and unloading mechanism on the upper layer of the cross-shaped worktable and placing them on opposite sides of the bed, the structure is simplified, allowing for simultaneous automatic loading and unloading and rolling operations, which improves the rolling efficiency of the workpiece. Moreover, it avoids mutual interference between the rolling mechanism and the loading and unloading mechanism during use, thus improving the safety and reliability of this rolling mill. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of an external cylindrical rolling mill according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the cross-shaped worktable in an external cylindrical rolling mill according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the telescopic cylinder in an external cylindrical rolling mill according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the adjustment component in an external cylindrical rolling mill according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Bed; 2. Spindle mechanism; 3. Clamping mechanism; 4. Cross worktable; 5. Mounting bracket; 6. Receiving tray; 7. Receiving trolley; 8. Hopper; 9. Telescopic cylinder; 10. Third drive assembly; 11. Equipment bracket; 12. Loading rack; 13. Second drive assembly; 14. Roller roller; 15. Roller block; 16. Lower pressing block; 17. Contouring groove; 18. Receiving groove; 19. Assembly groove; 20. Adjusting seat; 21. Telescopic rod; 22. Guide column; 23. Strip hole. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0018] An external cylindrical rolling mill, such as Figures 1 to 4As shown, the machine includes a bed 1, with a clamping mechanism 3 at one end and a spindle mechanism 2 at the other end. A cross worktable 4 is provided on the bed 1 at a position corresponding to the position between the clamping mechanism 3 and the spindle mechanism 2. The lower layer of the cross worktable 4 is slidably mounted on the bed 1. The bed 1 is provided with a first drive assembly for moving the cross worktable 4 between the clamping mechanism 3 and the spindle mechanism 2. A rolling mechanism and a loading / unloading mechanism are provided on the upper layer of the cross worktable 4. The rolling mechanism and the loading / unloading mechanism are arranged on the left and right sides of the bed 1, and there is a receiving gap between the rolling mechanism and the loading / unloading mechanism for accommodating the workpiece to be processed.

[0019] Specifically, the bed 1 can be a conventional lathe bed 1, and the cross worktable 4 can be an existing cross slide. This embodiment does not involve any improvement to the spindle mechanism 2. It can be achieved by CNC-modifying a conventional lathe. For example, the spindle motor in the spindle mechanism 2 can be replaced with a frequency converter motor, which directly drives the spindle to rotate via a pulley. The spindle motor is driven by a frequency converter. The trapezoidal lead screws of the X and Z axes can be replaced with the first drive assembly, such as a ball screw combined with a servo motor, to drive the cross worktable 4 to move longitudinally. A hydraulic station can be added to the equipment to drive the hydraulic cylinder in the rolling mechanism. A clamping mechanism 3, such as a clamping pneumatic cylinder, can be added to the clamping mechanism 3. Those skilled in the art can select and configure the bed 1, spindle mechanism 2, and clamping mechanism 3 according to actual needs to achieve the clamping and fixing of the workpiece to be processed, so that the rolling mechanism can roll the workpiece to be processed. This will not be elaborated here.

[0020] In practical applications, a third drive assembly 10 is provided on the lower layer of the cross-shaped worktable 4 to drive the movement of the upper layer of the cross-shaped worktable 4. Exemplarily, the third drive assembly 10 can also employ existing drive devices such as ball screws and servo motors. By setting both the rolling mechanism and the loading / unloading mechanism on the upper layer of the cross-shaped worktable 4, and placing them on opposite sides of the bed 1, not only is the structure simplified, but the two mechanisms can also work together to simultaneously achieve automatic loading / unloading and rolling operations, which is beneficial for improving the rolling processing efficiency of the workpiece. Furthermore, it can avoid mutual interference between the rolling mechanism and the loading / unloading mechanism during use, which is beneficial for improving the safety and reliability of this rolling machine during operation.

[0021] Preferably, the rolling mechanism includes a mounting bracket 5 disposed on the upper layer of the cross worktable 4, a rolling block 15 disposed on the mounting bracket 5, the rolling block 15 being slidably mounted on the mounting bracket 5, and a second driving assembly 13 disposed on the mounting bracket 5 for driving the rolling block 15 to move toward the workpiece to be processed; a rolling wheel 14 is disposed on one end of the rolling block 15 facing the workpiece to be processed, and the rolling wheel 14 is rotatably mounted on the rolling block 15.

[0022] For example, the rolling block 15 is slidably mounted on the mounting bracket 5 via a linear guide rail. The second drive assembly 13 includes a hydraulic cylinder, the fixed end of which is disposed on the mounting bracket 5, and the telescopic end is connected to the rolling block 15. By using a linear guide rail to mount the rolling block 15, the stability of the rolling block 15 during movement is improved, thereby improving the rolling accuracy of the rolling mechanism.

[0023] In practical applications, at least three rolling blocks 15 are spaced apart along the circumference of the workpiece to be processed. By using three rolling blocks 15, rolling processing around the workpiece can be achieved. Those skilled in the art can also adjust the number of rolling blocks 15 according to actual needs to better perform rolling processing on the workpiece. The hydraulic cylinders can be hydraulic oil cylinders. Three hydraulic oil cylinders are installed on the mounting bracket 5 corresponding to the rolling blocks 15, along with three linear guide rails. The rolling blocks 15 are installed on the guide rail sliders, and the rolling rollers 14 are rotatably mounted on the rolling roller 14 mounting block. In this way, the piston of the hydraulic cylinder can drive the rolling blocks to move back and forth along the linear guide rails. The movement of the rolling rollers 14 achieves the clamping and loosening of the workpiece to be processed. The clamping force of the rolling rollers 14 can be adjusted by adjusting the pressure of the hydraulic station.

[0024] Preferably, the mounting bracket 5 has a receiving groove 18 for accommodating the workpiece to be processed on the side facing the loading and unloading mechanism, and the receiving groove 18 is in communication with the receiving gap. For example, the rolling blocks 15 can be arranged corresponding to the edge of the receiving groove 18, which helps to improve the stability of each rolling block 15 when it moves on the mounting bracket 5.

[0025] Preferably, the loading and unloading mechanism includes an equipment support 11 mounted on the upper layer of the cross worktable 4. The equipment support 11 is provided with a loading rack 12 and a receiving tray 6 from top to bottom. The loading rack 12 is provided with an assembly slot 19 for accommodating the workpiece to be processed on the side facing the rolling mechanism. The loading rack 12 is provided with an adjustment component for adjusting the height of the workpiece to be processed. The receiving tray 6 is inclinedly mounted on the equipment support 11, and the side of the receiving tray 6 that is inclined upward is provided corresponding to the assembly slot 19 of the loading rack 12.

[0026] For example, the receiving tray 6 is provided with a guide groove for guiding the movement of the workpiece, thereby ensuring that the workpiece after roll forming can roll down along the receiving tray 6 for unloading. In actual use, after the workpiece to be processed enters the assembly slot 19, the position of the workpiece to be processed can be adjusted by using the cross worktable 4 and the adjustment assembly, so that the spindle mechanism 2 and the clamping mechanism 3 can clamp and fix the workpiece to be processed. Then, the upper part of the cross worktable 4 can be driven to move, and the roll forming mechanism can be used to roll form the workpiece to be processed. Finally, the upper part of the cross worktable 4 is driven to move again. When the workpiece moves to the upward end of the receiving tray 6, the spindle mechanism 2 and the clamping mechanism 3 release the workpiece fixation, and the workpiece can be unloaded by its own gravity through the receiving tray 6. The operation is simple and helps to improve the unloading efficiency of the workpiece. In addition, the receiving tray 6 can also be used with the receiving carriage 7. The receiving carriage 7 is set at the downward end of the receiving tray 6 to realize continuous receiving of workpieces.

[0027] In practical applications, a material bin 8 is provided on the lower layer of the cross worktable 4, corresponding to the position above the loading rack 12, which can cooperate with the loading rack 12. The material bin 8 has a discharge port below it and an inclined surface inside. The inclined surface is oriented downwards towards the discharge port. A telescopic cylinder 9 is provided above the material bin 8, corresponding to the position above the discharge port. The fixed end of the telescopic cylinder 9 is set on the material bin 8, and the telescopic end is provided with a pressing block 16. The pressing block 16 is provided with a contour groove 17 that can cooperate with the workpiece to be processed.

[0028] For example, the hopper 8 can be mounted and fixed to the lower layer of the cross-shaped worktable 4 via a mounting bracket, so as to move with the cross-shaped worktable 4. The telescopic cylinder 9 can be a pneumatic cylinder, and the loading rack 12 can be positioned close to or against the lower surface of the hopper 8, so that when the assembly slot 19 on the loading rack 12 is aligned with the discharge port, the workpiece to be processed can stably fall into the assembly slot 19 under its own weight and the action of the telescopic cylinder 9. Simultaneously, after the loading rack 12 moves, it can also block the discharge port to prevent excess workpieces from falling out. In actual use, by setting a contour groove 17 on the lower pressure block 16, and utilizing the contour groove 17 in conjunction with the workpiece to be processed, it can be ensured that the workpiece to be processed stops smoothly in the assembly slot 19 of the loading rack 12, which is beneficial to improving the subsequent workpiece loading and clamping accuracy.

[0029] Preferably, the adjustment assembly includes an adjustment seat 20 and a telescopic rod 21. The adjustment seat 20 is slidably mounted on the feeding rack 12, and the side of the adjustment seat 20 facing the rolling mechanism is provided with a mounting groove that mates with the workpiece to be processed. One end of the telescopic rod 21 is connected to the feeding rack 12, and the other end is connected to the adjustment seat 20.

[0030] For example, the telescopic rod 21 can also be a telescopic cylinder. Two guide posts 22 are spaced apart on the loading rack 12. The adjusting seat 20 has strip-shaped holes 23 that slide with the guide posts 22. Each strip-shaped hole 23 is inclined on the adjusting seat 20. One end of the telescopic rod 21 is rotatably mounted on the loading rack 12, and the other end is rotatably connected to the adjusting seat 20. The guide posts 22 are cylindrical structural components. By spaced apart at least two guide posts 22, and utilizing the sliding engagement between the guide posts 22 and the inclined strip-shaped holes 23 on the adjusting seat 20, the adjusting seat 20 can be driven to push the workpiece to be processed for height adjustment.

[0031] In practical applications, the adjustment components with this structure can also allow the telescopic rod 21 to be set on the side of the loading rack 12, and the length direction of the telescopic rod 21 to be the same as the moving direction of the loading rack 12. This helps to simplify the structure, reduce space occupation, prevent the telescopic rod 21 from affecting the loading and unloading of workpieces, and improve the stability of the loading and unloading mechanism.

[0032] Preferably, the lower layer of the cross-shaped worktable 4 is provided with a third drive assembly 10 for driving the upper layer of the cross-shaped worktable 4 to move. Exemplarily, the third drive assembly 10 can also be an existing driver such as a ball screw and a servo motor to achieve the purpose of driving the upper layer of the cross-shaped worktable 4 to move, which will not be described in detail here.

[0033] The rolling process of this type of rolling mill is as follows: First, the workpiece to be processed is loaded into the hopper 8 in parallel. The top of the clamping mechanism 3 is retracted to the workpiece release position. The adjusting seat 20 on the adjusting component is lowered, the rolling roller 14 is in the release state, and the telescopic cylinder 9 drives the lower pressing block 16 to press down the workpiece to be processed so that the workpiece falls into the loading rack 12. The workpiece on the loading rack 12 is adjusted to ensure that the workpiece to be processed stops smoothly on the loading rack 12. After a delay of 2 seconds, the telescopic cylinder 9 drives the lower pressing block 16 to rise.

[0034] Secondly, the cross worktable 4 drives the loading and unloading mechanism to move and stops the workpiece to be processed at the workpiece loading position. After the workpiece to be processed stops between the spindle tip and the clamping mechanism 3 tip, the adjusting seat 20 on the adjusting component lifts the workpiece to be processed. The clamping mechanism 3 tip extends to clamp the workpiece between the spindle mechanism 2 and the clamping mechanism 3 tip. After the tip clamping signal is in place, the adjusting seat 20 on the adjusting component falls down.

[0035] Then, the cross worktable 4 drives the rolling mechanism to move to the workpiece to be processed. The rolling roller 14 clamps and applies pressure to the workpiece under the drive of the hydraulic cylinder. After clamping, the spindle mechanism 2 starts to rotate. The lower layer of the cross worktable 4 drives the rolling mechanism to move and roll the workpiece.

[0036] Finally, after the rolling is completed, the rolling roller 14 releases the workpiece, and the upper layer of the cross worktable 4 carries the workpiece to the workpiece unloading position. The top of the clamping mechanism 3 releases, and the workpiece falls into the receiving tray 6 and slides down onto the receiving cart 7. After the signal for the top of the clamping mechanism 3 to release is received, the upper layer of the cross worktable 4 carries the loading and unloading mechanism to the workpiece loading position, and the rolling of the next workpiece begins. This cycle continues until no more workpieces flow out of the hopper 8. After the top of the clamping mechanism 3 tightens and no workpiece clamping signal is issued, the rolling cycle stops.

[0037] The key feature of this invention is that at least three rolling rollers 14 are on the same circumference, and the pressure of the rolling rollers 14 on the workpiece to be processed is the same. The loading rack 12 in the loading and unloading mechanism can not only achieve stable loading of the workpiece to be processed, but also prevent the workpiece to be processed from being squeezed or bumped at the discharge port, ensuring that the workpiece to be processed can continuously and automatically fall from the hopper 8 onto the loading rack 12. In addition, the loading position, unloading position, and rolling position of the workpiece to be processed are all controlled by a servo motor driven by a CNC system, and the repeatability of the X-axis and Z-axis positioning meets the requirements of the workpiece to be processed. The tailstock cylinder pressure in the clamping mechanism 3 is adjustable, which can ensure that the clamping force of the workpiece to be processed at the two centers is stable and can prevent the workpiece to be processed from bending or deforming.

[0038] This invention discloses an external cylindrical rolling mill that can automatically and continuously roll workpieces after they are loaded into the hopper until all workpieces in the hopper have been rolled. No operator intervention is required during this process. With workpieces in the hopper, unmanned automatic rolling can be achieved. Once all workpieces in the hopper have been rolled, the machine automatically stops rolling. The rolling pressure of this external cylindrical rolling mill can be adjusted as needed via hydraulic pressure, and the spindle rotation speed can be adjusted as needed via CNC programming, resulting in high rolling precision.

[0039] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An external cylindrical rolling mill, comprising a bed (1), wherein a clamping mechanism (3) is provided at one end of the bed (1) and a spindle mechanism (2) is provided at the other end, characterized in that: A cross worktable (4) is provided on the bed (1) at a position corresponding to the clamping mechanism (3) and the spindle mechanism (2). The lower layer of the cross worktable (4) is slidably mounted on the bed (1). The bed (1) is provided with a first drive assembly for moving the cross worktable (4) between the clamping mechanism (3) and the spindle mechanism (2). A rolling mechanism and a loading / unloading mechanism are provided on the upper layer of the cross worktable (4). The rolling mechanism and the loading / unloading mechanism are arranged on the left and right sides of the bed (1). There is a space between the rolling mechanism and the loading / unloading mechanism. The roller pressing mechanism includes a mounting bracket (5) on the upper layer of a cross worktable (4), a roller pressing block (15) on the mounting bracket (5), the roller pressing block (15) being slidably mounted on the mounting bracket (5), and a second driving assembly (13) on the mounting bracket (5) for driving the roller pressing block (15) to move toward the workpiece to be processed; a roller pressing wheel (14) is provided on one end of the roller pressing block (15) facing the workpiece to be processed, and the roller pressing wheel (14) is rotatably mounted on the roller pressing block (15); The loading and unloading mechanism includes an equipment support (11) on the upper layer of the cross worktable (4). The equipment support (11) is provided with a loading rack (12) and a receiving tray (6) from top to bottom. The loading rack (12) has an assembly slot (19) for accommodating the workpiece to be processed on the side facing the rolling mechanism. The loading rack (12) is provided with an adjustment component for adjusting the height of the workpiece to be processed. The receiving tray (6) is inclined on the equipment support (11), and the side of the receiving tray (6) inclined upward is provided corresponding to the assembly slot (19) of the loading rack (12). The adjustment assembly includes an adjustment seat (20) and a telescopic rod (21). The adjustment seat (20) is slidably mounted on the loading rack (12). The side of the adjustment seat (20) facing the rolling mechanism is provided with an installation groove that cooperates with the workpiece to be processed. One end of the telescopic rod (21) is connected to the loading rack (12), and the other end is connected to the adjustment seat (20). Two guide posts (22) are spaced apart on the loading rack (12). The adjustment seat (20) is provided with strip holes (23) that slidably cooperate with the guide posts (22). Each strip hole (23) is inclinedly arranged on the adjustment seat (20). One end of the telescopic rod (21) is rotatably mounted on the loading rack (12), and the other end is rotatably connected to the adjustment seat (20).

2. The external cylindrical rolling mill according to claim 1, characterized in that: The rolling block (15) is slidably mounted on the mounting bracket (5) via a linear guide rail. The second drive assembly (13) includes a hydraulic cylinder, the fixed end of which is mounted on the mounting bracket (5), and the telescopic end is connected to the rolling block (15).

3. An external cylindrical rolling mill according to claim 1 or 2, characterized in that: At least three rolling blocks (15) are arranged at intervals along the circumference of the workpiece to be processed.

4. The external cylindrical rolling mill according to claim 3, characterized in that: The mounting bracket (5) has a receiving groove (18) on the side facing the loading and unloading mechanism for accommodating the workpiece to be processed, and the receiving groove (18) is connected to the receiving gap.

5. An external cylindrical rolling mill according to claim 1, characterized in that: The lower layer of the cross worktable (4) is provided with a hopper (8) that can cooperate with the loading rack (12) at the position above the loading rack (12). The hopper (8) has a discharge port below it and a sloping part inside it. The sloping part is set with the downward end facing the discharge port. The hopper (8) is provided with a telescopic cylinder (9) above it at the position corresponding to the discharge port. The fixed end of the telescopic cylinder (9) is set on the hopper (8), and the telescopic end is provided with a pressing block (16). The pressing block (16) is provided with a contour groove (17) that can cooperate with the workpiece to be processed.

6. The external cylindrical rolling mill according to claim 1, characterized in that: The lower layer of the cross worktable (4) is provided with a third drive assembly (10) for driving the upper layer of the cross worktable (4) to move.

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