CN218134739U

CN218134739U - Ring forging equipment for grain refining forging

Info

Publication number: CN218134739U
Application number: CN202221722782.6U
Authority: CN
Inventors: 葛协东; 葛征坪; 李洪
Original assignee: Jiangyin Jingsong Technology Co ltd
Current assignee: Jiangyin Jingsong Technology Co ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-12-27
Anticipated expiration: 2032-07-05

Abstract

The utility model discloses a grain refines ring forging equipment of forging, include the organism, set up supporting mechanism and forging press mechanism on the organism, forging press mechanism set up in directly over supporting mechanism, forging press mechanism's bottom is equipped with forging head, its characterized in that: the machine bodies on the two sides of the supporting mechanism are respectively symmetrically provided with a centering mechanism, and the centering mechanisms are arranged on the machine bodies in a vertically moving manner; the middle part of the supporting mechanism is provided with a jacking positioning assembly, the jacking positioning assembly retracts into the supporting mechanism when in a retracting state, and the top of the jacking positioning assembly is arranged right above the supporting mechanism when in an extending state; the forging mechanism is further provided with a middle limiting assembly, and the middle limiting assembly moves up and down synchronously along with the forging mechanism. The utility model provides high forging and pressing efficiency and forging and pressing quality have reduced operating personnel intensity of labour and potential safety hazard.

Description

Ring forging equipment of grain refining forging

Technical Field

The utility model relates to a forge the field, especially relate to a grain refines ring forging equipment of forging.

Background

When the forged piece after grain refinement is subjected to ring forging in an aligned manner, the conventional ring forging method is as follows: 1. forging and pressing the columnar blank for multiple times to obtain a columnar blank with a smaller height and a larger diameter; 2. then, a cylindrical part is placed in the middle of the blank, and the blank is forged and pressed for multiple times, so that the material in the middle of the cylindrical part is forged and removed to form an annular structure; 3. and then the blank is placed in a ring forging machine, the forging is pushed to roll through the rotation of the compression roller, and ring forging is carried out simultaneously, so that the ring forging is completed.

In the mode, the forging needs to be forged for multiple times, the required forging time is long, the forging is exposed in the air for a long time, the temperature can be reduced, and the performance of the forging can be influenced by forging and ring forging after the temperature is reduced; meanwhile, a forging press and a ring forging device and two devices are needed, the ring forging speed is low, and the cost is higher. Simultaneously, when forging and pressing the blank for the annular member for the first time, need operating personnel to put the column type spare in the blank middle part, then will take out the column type spare with the blank middle part, need operating personnel auxiliary operation, operating personnel intensity of labour can be than higher, is in the operation of high temperature forging next door moreover, has great potential safety hazard.

Disclosure of Invention

The utility model aims at providing a grain refines ring forging equipment of forging, through using this structure, improve ring forging efficiency and ring forging quality, guarantee the performance of forging simultaneously, reduce the forging cost.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the ring forging equipment for the grain refining forge piece comprises a machine body, a supporting mechanism and a forging mechanism, wherein the supporting mechanism and the forging mechanism are arranged on the machine body;

the middle part of the supporting mechanism is provided with a jacking positioning assembly, the jacking positioning assembly retracts into the supporting mechanism in the retraction state of the jacking positioning assembly, and the top of the jacking positioning assembly is arranged right above the supporting mechanism in the extension state of the jacking positioning assembly;

the forging mechanism is also provided with a middle limiting component, the middle limiting component synchronously moves up and down along with the forging mechanism, the middle limiting component is rotatably installed on the forging mechanism and has a use form and a non-use form, when the middle limiting component is in the use form, the middle limiting component is arranged right below the forging head, and the top surface of the middle limiting component is contacted with the bottom surface of the forging head; and under the non-use state of the middle limiting assembly, the middle limiting assembly is arranged on the outer side of the forging mechanism.

In the technical scheme, the supporting mechanism comprises a supporting frame and a supporting table arranged at the top of the supporting frame, and the supporting table is arranged under the forging head.

In the technical scheme, the jacking positioning assembly comprises a jacking hydraulic cylinder and a jacking column, the jacking hydraulic cylinder is mounted on the support frame, a through hole is formed in the middle of the support table, the bottom of the jacking column is connected with an output shaft at the top of the jacking hydraulic cylinder, and the top of the jacking column is inserted into the through hole; the top of the jacking column is flush with the top surface of the supporting platform when the output shaft of the jacking hydraulic cylinder is in a retraction state; and under the state that the output shaft of the jacking hydraulic cylinder extends out, the top of the jacking column is arranged right above the supporting table.

In the technical scheme, the centering mechanism comprises a sliding block, a lifting assembly and a material pushing assembly, vertical sliding rails are respectively arranged on machine bodies on two sides of the supporting mechanism, the sliding block is arranged on the vertical sliding rails beside the supporting mechanism in a sliding manner, the lifting assembly is installed on the machine body below the sliding block, and the lifting assembly pushes the sliding block to move up and down on the vertical sliding rails; the pushing assembly is arranged on the sliding block and comprises a transverse hydraulic cylinder and a pushing part, the transverse hydraulic cylinder is arranged on the outer side surface of the sliding block, an output shaft of the transverse hydraulic cylinder penetrates through the sliding block and is arranged at the inner end of the sliding block, and the outer end of the pushing part is connected with the output shaft of the transverse hydraulic cylinder; when the output shaft of the transverse hydraulic cylinder extends out, the material pushing parts of the two groups of centering mechanisms are arranged close to each other; when the sliding block moves upwards, the material pushing portion is arranged on the side portion above the supporting mechanism, and when the sliding block moves downwards, the material pushing portion is arranged on the side portion below the top of the supporting mechanism.

In the technical scheme, the lifting assembly comprises a lifting hydraulic cylinder, the lifting hydraulic cylinder is installed on the machine body below the sliding block, an output shaft at the top of the lifting hydraulic cylinder is connected with the bottom of the sliding block, and the lifting hydraulic cylinder drives the sliding block to move up and down.

In the technical scheme, the pushing portion is arranged on the inner side of the sliding block and comprises a connecting block and at least two groups of pushing rollers, the outer end of the connecting block is connected with an output shaft of the transverse hydraulic cylinder, a notch is formed in the inner end of the connecting block, the middle of each group of pushing rollers is rotatably connected with the notch through a connecting shaft, the outer surfaces of the pushing rollers are arranged outside the notches, multiple groups of pushing rollers are arranged at intervals from front to back, and the connecting shafts are parallel to the vertical sliding rails.

In the above technical solution, the middle position limiting component includes a positioning ring and a rotation driving mechanism, the outer surface of the positioning ring is connected to the rotation driving mechanism through a connecting plate, and the rotation driving mechanism drives the connecting plate to rotate, so that the positioning ring is rotatably disposed right below the forging head or rotatably disposed outside the forging mechanism; the middle part of holding ring is equipped with one and steps down the hole, the holding ring set up in when forging and pressing the head under, the top surface of holding ring with the bottom surface contact of forging and pressing the head, just the hole of stepping down set up in directly over jacking locating component.

In the technical scheme, the bottom of the positioning ring is provided with an extension ring extending downwards, the inner wall of the extension ring is flush with the inner wall of the abdicating hole, and the outer diameter of the extension ring is smaller than that of the positioning ring; a first limiting piece and a second limiting piece are arranged on the outer surface of the positioning ring, a first blocking piece is arranged on the outer surface of the forging head, a second blocking piece is arranged on the forging mechanism, and when the positioning ring is arranged right below the forging head, the first limiting piece is in contact with the first blocking piece; when the positioning ring is arranged on the outer side of the forging mechanism, the second limiting part is in contact with the second blocking part.

In the technical scheme, a blanking assembly is arranged on the outer wall of the forging mechanism and comprises a blanking hydraulic cylinder and a blanking head, the blanking hydraulic cylinder is arranged on the outer wall of the forging mechanism, the middle part of the top surface of the blanking head is connected with an output shaft at the bottom of the blanking hydraulic cylinder, and when the positioning ring is arranged on the outer side of the forging mechanism, the abdicating hole is arranged right below the blanking head; the top of the blanking head is arranged above the top surface of the positioning ring when the output shaft of the blanking hydraulic cylinder is in a retraction state; and under the state that the output shaft of the blanking hydraulic cylinder extends out, the blanking head is inserted into the abdicating hole.

In order to achieve the purpose, the utility model discloses a ring forging method of forging is refine to grain, its step is:

(1) placing the heated columnar blank on the top of the support table, wherein the columnar blank is arranged close to the center of the support table;

(2) the centering mechanisms on the two sides ascend to face the columnar blank, then the output shafts of the transverse hydraulic cylinders in the centering mechanisms extend out to drive the material pushing parts to move inwards, so that the pushing rollers are in contact with the surface of the forge piece, and the columnar blank is pushed to be in the center of the supporting table by utilizing the mutual approach of the pushing rollers on the two sides;

(3) the forging mechanism descends, the forging head presses the top surface of the columnar blank, then a push roller of the centering mechanism is separated from contact with the columnar blank, and then the centering mechanism descends to enable the centering mechanism to be positioned below two sides of the supporting table;

(4) the forging mechanism descends, the columnar blank is flattened through the forging head, the diameter of the columnar blank is increased, the height of the columnar blank is shortened, after the forging mechanism descends in place, the height of the columnar blank is forged and pressed in place, then the forging mechanism drives the forging head to ascend for a certain distance, and the columnar blank is separated;

(5) the middle limiting assembly rotates to a position right below the forging head, meanwhile, a jacking column of the jacking positioning assembly ascends, the jacking column can push the column-shaped forging to move upwards and separate from the supporting table, and a abdicating hole of the positioning ring in the middle limiting assembly is coaxially arranged with the jacking column;

(6) the forging mechanism drives the forging head and the positioning ring to descend simultaneously, the positioning ring is in contact with the top surface of the cylindrical blank and pushes the cylindrical blank to move downwards, the jacking column is fixed, the jacking column can press the middle of the cylindrical blank out of a hole site, waste materials in the hole site are pressed into a yielding hole of the positioning ring, and the cylindrical blank is forged into an annular blank;

(7) the forging mechanism drives the forging head and the positioning ring to rise to separate from the annular blank, meanwhile, the waste materials are moved by the positioning ring to rise to separate from the annular blank, then the jacking column descends to retract the jacking column into the supporting table, the jacking column is separated from the annular blank to complete a group of annular forgings, the annular blank is grabbed away by using grabbing equipment, and a new column-shaped blank is replaced to prepare for the next group of annular forgings;

(8) grabbing away the annular blank by utilizing grabbing equipment, preparing the in-process of next a set of ring forging, the holding ring rotates the outside of forging mechanism, is in under the unloading subassembly, then unloading pneumatic cylinder output shaft stretches out to drive the blanking head and descends in the unloading subassembly, the in-process that the blanking head descends can go deep into the locating hole of stepping down of holding ring, will step down downthehole waste material and push away to leave and drop, then the blanking head rises, reply the normal position can, accomplish the separation of waste material and holding ring.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the utility model discloses in utilize supporting mechanism to support the blank, promote the positive center of supporting mechanism with the blank through centering mechanism, recycle forging and pressing mechanism and carry out disposable quick forging and pressing to the blank and target in place, recycle the help of middle part spacing subassembly and jacking locating component, realize once quick ring forging, can improve ring forging efficiency and quality like this, guarantee to produce property ability, reduce the forging cost, reduce operating personnel intensity of labour simultaneously, reduce the potential safety hazard.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention (in a cross-sectional view of a lower portion of a forging mechanism, in a use state of a middle limiting assembly);

fig. 2 is a schematic structural diagram of a first embodiment of the present invention (in a cross-sectional view of the lower portion of the forging mechanism, the middle position-limiting component is not in use);

fig. 3 is a top view of the supporting mechanism according to the first embodiment of the present invention;

fig. 4 is a bottom view (in a use state of the middle limiting component) of the forging mechanism according to a first embodiment of the present invention;

FIG. 5 is a bottom view of the forging mechanism (in a non-use state of the middle position limiting component)

Wherein: 1. a body; 2. a forging mechanism; 3. forging and pressing the head; 4. producing a product; 5. a support frame; 6. a support table; 7. a jacking hydraulic cylinder; 8. jacking a column; 9. a through hole; 10. a slider; 11. a vertical slide rail; 12. A transverse hydraulic cylinder; 13. a lifting hydraulic cylinder; 14. connecting blocks; 15. pushing the roller; 16. a notch; 17. a positioning ring; 18. a connecting plate; 19. a hole of abdication; 20. a rotating shaft; 21. an extension ring; 22. a first limit piece; 23. a second limiting member; 24. a first blocking member; 25. a second blocking member; 26. a blanking hydraulic cylinder; 27. And (5) discharging the stub bar.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

the first embodiment is as follows: referring to fig. 1 to 5, the ring forging equipment for the grain refining forge piece comprises an engine body 1, a supporting mechanism and a forging mechanism 2, wherein the supporting mechanism and the forging mechanism are arranged on the engine body, the forging mechanism is arranged right above the supporting mechanism, a forging head 3 is arranged at the bottom of the forging mechanism, a centering mechanism is symmetrically arranged on the engine body on two sides of the supporting mechanism respectively, and the centering mechanism is arranged on the engine body in a vertically moving mode;

In this embodiment, when in actual use, utilize forging manipulator to snatch high temperature column type forging and place on the supporting mechanism, product 4 can be close to the positive center of supporting mechanism, then centering mechanism centers the product, make the product can be in the positive center of supporting mechanism, then centering mechanism keeps away from the product, forging mechanism drives the forging head decline, forge the forging head to the column type structure of predetermined height, its external diameter also can reach predetermined diameter, realize forging and pressing and put in place once, then forging mechanism rises and makes the forging head keep away from the product, jacking locating component breaks away from the supporting mechanism with the product jack-up, the spacing subassembly in middle part rotates the below of forging head, then forging mechanism and forging head drive the spacing subassembly in middle part and descend, drive the product decline and support on the supporting mechanism, in this in-process, can utilize jacking locating component to make a hole with the middle part of product, realize the ring forging of product. In this embodiment, the ring forging can be accomplished through forging and pressing, a ring forging to the blank, and is efficient, of high quality, effectively guarantees product quality and performance, and need not operating personnel and assist, effectively reduces operating personnel intensity of labour, reduces the potential safety hazard, also can reduce cost.

Referring to fig. 1 and 2, the supporting mechanism includes a supporting frame 5 and a supporting table 6 mounted on the top of the supporting frame, and the supporting table is disposed right below the forging head. Wherein the product is placed on the top surface of the support table for forging and supporting the product.

Referring to fig. 1 to 3, the jacking positioning assembly includes a jacking hydraulic cylinder 7 and a jacking column 8, the jacking hydraulic cylinder is mounted on the support frame, a through hole 9 is formed in the middle of the support table, the bottom of the jacking column is connected with an output shaft at the top of the jacking hydraulic cylinder, and the top of the jacking column is inserted into the through hole; the top of the jacking column is flush with the top surface of the supporting platform when the output shaft of the jacking hydraulic cylinder is in a retraction state; and under the condition that the output shaft of the jacking hydraulic cylinder extends out, the top of the jacking column is arranged right above the supporting table.

In this embodiment, when the blank is put on the brace table, the output shaft of jacking pneumatic cylinder is in the state of contracting, the jacking post flushes with the brace table top surface, then forging mechanism descends and forges, be the major diameter with the product forging, the blank of low thickness, then the output shaft of jacking pneumatic cylinder stretches out, drive the jacking post and move up, the jacking post can jack up the product, make the product break away from the brace table, follow-up through forging mechanism, when the spacing subassembly in middle part pushes down, the position of jacking post is motionless temporarily, the jacking post can be with a hole site of punching out in the middle part of the product like this, make the product be the loop configuration, then the jacking post descends, can separate with the product.

Referring to fig. 1 to 3, the centering mechanism includes a slider 10, a lifting assembly and a pushing assembly, vertical slide rails 11 are respectively arranged on the machine bodies on both sides of the supporting mechanism, the slider is slidably arranged on the vertical slide rails beside the supporting mechanism, the lifting assembly is mounted on the machine body below the slider, and the lifting assembly pushes the slider to move up and down on the vertical slide rails; the pushing assembly is arranged on the sliding block and comprises a transverse hydraulic cylinder 12 and a pushing part, the transverse hydraulic cylinder is arranged on the outer side surface of the sliding block, an output shaft of the transverse hydraulic cylinder penetrates through the sliding block and is arranged at the inner end of the sliding block, and the outer end of the pushing part is connected with the output shaft of the transverse hydraulic cylinder; when the output shaft of the transverse hydraulic cylinder extends out, the material pushing parts of the two groups of centering mechanisms are arranged close to each other; when the sliding block moves upwards, the material pushing portion is arranged on the side portion above the supporting mechanism, and when the sliding block moves downwards, the material pushing portion is arranged on the side portion below the top of the supporting mechanism.

The lifting assembly comprises a lifting hydraulic cylinder 13, the lifting hydraulic cylinder is mounted on the machine body below the sliding block, an output shaft at the top of the lifting hydraulic cylinder is connected with the bottom of the sliding block, and the lifting hydraulic cylinder drives the sliding block to move up and down.

In this embodiment, when the blank was put on the brace table, lifting unit drove the slider and moves up for push away the material subassembly and just to the product, then two sets of material subassemblies that push away when being close to each other, can contact with the both sides of product, will promote the removal of product like this, make the product move the centre of brace table, can be in directly over the jacking post. After the centering is accomplished, the forging press mechanism descends for the forging press head is pressed at the product top, prevents the product skew, and pushing components keeps away from the product, and then lifting unit drives its decline, makes it be in the both sides of propping up a supporting bench, when forging press mechanism descends like this, can not contact with centering mechanism, prevents to damage centering mechanism, does not also influence the normal forging and pressing of forging press mechanism to the product.

Referring to fig. 1 to 3, the pushing portion is disposed on the inner side of the slider and includes a connecting block 14 and at least two sets of pushing rollers 15, the outer end of the connecting block is connected to the output shaft of the horizontal hydraulic cylinder, a notch 16 is disposed at the inner end of the connecting block, the middle of each set of pushing rollers is rotatably connected to the notch through a connecting shaft, the outer surfaces of the pushing rollers are disposed outside the notch, the pushing rollers are disposed at intervals from front to back, and the connecting shafts are parallel to the vertical sliding rails.

In this embodiment, the push rollers are generally two groups, so that there are 4 groups of push rollers in the two groups of centering mechanisms, an annular structure is formed between the four groups of push rollers, the pushing portion is close to the product, and when the pushing portion contacts the product, the pushing portion contacts the outer surface of the product through the push rollers, the four groups of push rollers form an annular mechanism to push the product, and the product is pushed to the center of the supporting table, so that the product is quickly and automatically centered, and the forging stability and quality are ensured.

Referring to fig. 1, 2, 4 and 5, the middle limiting assembly includes a positioning ring 17 and a rotation driving mechanism, an outer surface of the positioning ring is connected to the rotation driving mechanism through a connecting plate 18, and the rotation driving mechanism drives the connecting plate to rotate, so that the positioning ring is rotatably disposed right below the forging head or rotatably disposed outside the forging mechanism; the middle part of holding ring is equipped with one and steps down hole 19, the holding ring set up in when forging and pressing the head under, the top surface of holding ring with the bottom surface contact of forging and pressing the head, just the hole of stepping down set up in directly over jacking locating component.

In this embodiment, the spacing subassembly in middle part has user state and non-user state, in user state, it is a major diameter that the product is forged by forging press mechanism, the cylindricality piece of little thickness, then after the jacking post breaks away from a supporting bench with product jack-up, the spacing subassembly in middle part changes into user state again, rotation driving mechanism drive connecting plate and holding ring rotate, make the holding ring rotate under the forging head, it is in directly over the jacking post to step down the hole, then the forging press mechanism drives the spacing subassembly in middle part and moves down, the holding ring supports on the product top surface, and promote the product and move down, because the jacking post is fixed in position, a hole will be punched with the product middle part to jacking post and holding ring like this, the waste material that the jacking post will punch out is punched into in the hole of stepping down of holding ring. After the subsequent product is separated from the positioning ring, the rotary driving mechanism drives the positioning ring to rotate to the outer side of the forging mechanism, so that replacement and forging of the subsequent product cannot be influenced.

Referring to fig. 1, 2, 4, and 5, the rotation driving mechanism includes a rotation shaft 20, a motor, and a speed reducer (the motor is not shown in the speed reducer), the rotation shaft is rotatably installed on the forging mechanism, the rotation shaft is disposed at the front side of the forging head, the rotation shaft is disposed near the front side of the forging mechanism, the motor is connected to the rotation shaft via the speed reducer, the motor drives the rotation shaft to rotate, one end of the connecting plate is connected to the outer end of the positioning ring, and the other end of the connecting plate is connected to the bottom of the rotation shaft. The motor and the speed reducer drive the rotating shaft to rotate, and the positioning ring is driven to rotate through the connecting plate, so that the positioning ring is located below the forging head and is in a use state, or the positioning ring is rotated to the front side of the forging mechanism and is in a non-use state.

Referring to fig. 1, 2, 4 and 5, an extension ring 21 extending downwards is arranged at the bottom of the positioning ring, the inner wall of the extension ring is flush with the inner wall of the abdicating hole, and the outer diameter of the extension ring is smaller than that of the positioning ring; a first limiting part 22 and a second limiting part 23 are arranged on the outer surface of the positioning ring, a first blocking part 24 is arranged on the outer surface of the forging head, a second blocking part 25 is arranged on the forging mechanism, and when the positioning ring is arranged right below the forging head, the first limiting part is in contact with the first blocking part; when the positioning ring is arranged on the outer side of the forging mechanism, the second limiting part is in contact with the second blocking part. Wherein, the outer wall of the extension ring is a tapered structure with a large upper part and a small lower part.

In this embodiment, the first limiting member, the second limiting member, the first blocking member and the second blocking member are arranged, so that the rotation angle of the positioning ring can be limited, and the accuracy and stability of the use state and the non-use state of the positioning ring can be ensured. The setting of extension ring extends the ring inner wall and flushes with the downthehole wall of stepping down, utilizes the jacking post like this with the product middle part when punching a hole, extends the ring and can give the product hole site edge bigger pressure, plays a support effect of pushing down, can increase the degree of depth in the hole of stepping down simultaneously, reduces the materials of holding ring as far as possible, also can reduce the cost of equipment.

Referring to fig. 1, 2, 4 and 5, a blanking assembly is mounted on the outer wall of the forging mechanism, the blanking assembly comprises a blanking hydraulic cylinder 26 and a blanking head 27, the blanking hydraulic cylinder is mounted on the outer wall of the forging mechanism, the middle of the top surface of the blanking head is connected with an output shaft at the bottom of the blanking hydraulic cylinder, and when the positioning ring is arranged on the outer side of the forging mechanism, the abdicating hole is arranged right below the blanking head; the top of the blanking head is arranged above the top surface of the positioning ring when the output shaft of the blanking hydraulic cylinder is in a retraction state; and under the state that the output shaft of the blanking hydraulic cylinder extends out, the blanking head is inserted into the yielding hole.

In this embodiment, after the holding ring user state was accomplished, when changing into non-user state, a hole site was gone out with the product middle part to the jacking post, and its waste material can be rushed into and step down downtheholely, also is exactly the waste material card downthehole in stepping down, and the location is changeed and is rotated to forging and pressing mechanism outside after, and the hole of stepping down is just to blanking head, and blanking head descends, will step down downthehole waste material and go out, makes it drop, when not influencing follow-up product forging and pressing.

In order to achieve the purpose, the invention adopts a ring forging method of a grain refining forging, which comprises the following steps:

(2) the centering mechanisms on the two sides ascend to face the columnar blank, then the output shafts of the transverse hydraulic cylinders in the centering mechanisms extend out to drive the pushing parts to move inwards, so that the pushing rollers are in contact with the surface of the forge piece, and the columnar blank is pushed to be in the center of the support table by utilizing the mutual approach of the pushing rollers on the two sides;

(3) the forging mechanism descends, the forging head presses the top surface of the columnar blank, then the push roller of the centering mechanism is separated from the contact with the columnar blank, and then the centering mechanism descends to enable the centering mechanism to be positioned below two sides of the supporting table;

Claims

1. The utility model provides a grain refines ring forging equipment of forging, includes the organism, sets up supporting mechanism and forging press mechanism on the organism, forging press mechanism set up in directly over supporting mechanism, forging press mechanism's bottom is equipped with forging head, its characterized in that: the machine bodies on the two sides of the supporting mechanism are respectively symmetrically provided with a centering mechanism, and the centering mechanisms are arranged on the machine bodies in a vertically moving manner;

the forging mechanism is also provided with a middle limiting component, the middle limiting component synchronously moves up and down along with the forging mechanism, the middle limiting component is rotatably installed on the forging mechanism and has a use form and a non-use form, when the middle limiting component is in the use form, the middle limiting component is arranged right below the forging head, and the top surface of the middle limiting component is contacted with the bottom surface of the forging head; and under the condition that the middle limiting component is not used, the middle limiting component is arranged on the outer side of the forging mechanism.

2. The apparatus for ring forging of a grain refined forging of claim 1, wherein: the supporting mechanism comprises a supporting frame and a supporting platform arranged at the top of the supporting frame, and the supporting platform is arranged under the forging head.

3. The apparatus for ring forging of a grain refined forging of claim 2, wherein: the jacking positioning assembly comprises a jacking hydraulic cylinder and a jacking column, the jacking hydraulic cylinder is mounted on the support frame, a through hole is formed in the middle of the support table, the bottom of the jacking column is connected with an output shaft at the top of the jacking hydraulic cylinder, and the top of the jacking column is inserted into the through hole; the top of the jacking column is flush with the top surface of the supporting platform when the output shaft of the jacking hydraulic cylinder is in a retraction state; and under the state that the output shaft of the jacking hydraulic cylinder extends out, the top of the jacking column is arranged right above the supporting table.

4. The apparatus for ring forging of a grain refined forging of claim 1, wherein: the centering mechanism comprises a sliding block, a lifting assembly and a material pushing assembly, vertical sliding rails are respectively arranged on machine bodies on two sides of the supporting mechanism, the sliding block is arranged on the vertical sliding rails on the side of the supporting mechanism in a sliding mode, the lifting assembly is installed on the machine body below the sliding block, and the lifting assembly pushes the sliding block to move up and down on the vertical sliding rails; the pushing assembly is arranged on the sliding block and comprises a transverse hydraulic cylinder and a pushing part, the transverse hydraulic cylinder is arranged on the outer side surface of the sliding block, an output shaft of the transverse hydraulic cylinder penetrates through the sliding block and is arranged at the inner end of the sliding block, and the outer end of the pushing part is connected with the output shaft of the transverse hydraulic cylinder; when the output shaft of the transverse hydraulic cylinder extends out, the material pushing parts of the two groups of centering mechanisms are arranged close to each other; when the sliding block moves upwards, the material pushing portion is arranged on the side portion above the supporting mechanism, and when the sliding block moves downwards, the material pushing portion is arranged on the side portion below the top of the supporting mechanism.

5. The apparatus of claim 4 for ring forging a grain refined forging, wherein: the lifting assembly comprises a lifting hydraulic cylinder, the lifting hydraulic cylinder is installed on the machine body below the sliding block, an output shaft at the top of the lifting hydraulic cylinder is connected with the bottom of the sliding block, and the lifting hydraulic cylinder drives the sliding block to move up and down.

6. The apparatus for ring forging of a grain refined forging of claim 4, wherein: the material pushing portion is arranged on the inner side of the sliding block and comprises a connecting block and at least two groups of pushing rollers, the outer end of the connecting block is connected with an output shaft of the transverse hydraulic cylinder, a notch is formed in the inner end of the connecting block, each group of pushing rollers is connected with the notch in a rotating mode through a connecting shaft, the outer surfaces of the pushing rollers are arranged outside the notch, the pushing rollers are arranged in a multi-group mode through a front-to-back interval, and the connecting shaft is parallel to the vertical sliding rail.

7. The apparatus for ring forging of a grain refined forging of claim 1, wherein: the middle limiting assembly comprises a positioning ring and a rotary driving mechanism, the outer surface of the positioning ring is connected with the rotary driving mechanism through a connecting plate, and the rotary driving mechanism drives the connecting plate to rotate, so that the positioning ring is rotatably arranged right below the forging head or rotatably arranged on the outer side of the forging mechanism; the middle part of holding ring is equipped with one and steps down the hole, the holding ring set up in when forging and pressing the head under, the top surface of holding ring with the bottom surface contact of forging and pressing the head, just the hole of stepping down set up in directly over jacking locating component.

8. The apparatus of claim 7, wherein: the bottom of the positioning ring is provided with an extension ring extending downwards, the inner wall of the extension ring is flush with the inner wall of the abdicating hole, and the outer diameter of the extension ring is smaller than that of the positioning ring; a first limiting piece and a second limiting piece are arranged on the outer surface of the positioning ring, a first blocking piece is arranged on the outer surface of the forging head, a second blocking piece is arranged on the forging mechanism, and when the positioning ring is arranged under the forging head, the first limiting piece is in contact with the first blocking piece; when the positioning ring is arranged on the outer side of the forging mechanism, the second limiting part is in contact with the second blocking part.

9. The apparatus for ring forging of a grain refined forging of claim 7, wherein: a blanking assembly is arranged on the outer wall of the forging mechanism and comprises a blanking hydraulic cylinder and a blanking head, the blanking hydraulic cylinder is arranged on the outer wall of the forging mechanism, the middle part of the top surface of the blanking head is connected with an output shaft at the bottom of the blanking hydraulic cylinder, and when the positioning ring is arranged on the outer side of the forging mechanism, the abdicating hole is arranged right below the blanking head; the top of the blanking head is arranged above the top surface of the positioning ring when the output shaft of the blanking hydraulic cylinder is in a retraction state; and under the state that the output shaft of the blanking hydraulic cylinder extends out, the blanking head is inserted into the abdicating hole.