CN110695110B - A crank extrusion forming device and crank extrusion method for easy demoulding - Google Patents

Abstract

The invention relates to a crank extrusion forming device and a crank extrusion forming method easy to demould, wherein the crank extrusion forming device comprises a working plate, a first working part and a second working part which are arranged on two opposite sides of the working plate, a third working part and a fourth working part which are arranged on the other two opposite sides of the working plate, and a fifth working part which is arranged above the working plate; the first working part is provided with a fixed thick plate, the second working part, the third working part and the fourth working part are respectively provided with a movable push plate, the fifth working part is provided with a lower pressing plate capable of being pressed downwards, and the lower pressing plate is provided with a separating pressing plate; through the cooperation operation of five work portions, can carry out extrusion work to high temperature crank throw blank to after accomplishing extrusion work, each work portion can easily withdraw. Compared with the prior art, the invention can effectively extrude and mold the crank throw, is easy to demould and can not cause that the mold or the forge piece is difficult to take out.

Description

A crank extrusion forming device and crank extrusion method for easy demoulding

technical field

The invention belongs to the field of mechanical engineering, and relates to a crank extruding device and a crank extruding method that can be easily demolded, in particular to a crank crank that can effectively extrude and mold, and is easy to demold without causing A device and method for taking out a die or a forging that is difficult to take out.

Background technique

Large-scale marine crankshafts are heavy, require high machining accuracy, and are difficult to manufacture. They are very important core components in the shipbuilding industry. The crank crank is a key component of the marine crankshaft. The forging methods for a single large crank crank usually include block forging, ring forging, die forging, upsetting forging, bending forging and other preliminary manufacturing methods. After the high-temperature blanks are made into rough crank products, they are then finished by machine tools/machining centers to form the final crank products.

Through a large number of case investigations, it is found that there are the following shortcomings in the current forging process of crank arms:

The block forging method has a large processing allowance, high cost, and the quality is difficult to meet the standard, and the scrap rate is relatively high; the ring forging method requires high operating skills of equipment and workers, and it is not easy to achieve in production; the die forging method is difficult to achieve in the processing process. The extrusion of the high-temperature blank raw material results in a large extrusion force with the mold cavity. After the extrusion is completed, the mold is difficult to detach, and the crank is difficult to take out; the manufacturing cost of the upsetting method is too high, which is not suitable for small Mass production; the bending forging method is currently widely used, but the processing process is more complicated and the processing cycle is long.

Chinese patent CN109014010A discloses an extrusion molding device and a molding method for a crank forging of a marine low-speed diesel engine. The extrusion molding device includes an extruding inner sleeve, an outer casing, an upper punch and a moving platen. The center position of the moving platen corresponds to the outer casing, and the outer casing is located on the outer side of the extruded inner casing. The extruded inner casing includes an inner casing body and an inner casing bottom plate located at the bottom of the outer casing. The outer casing and the inner casing bottom plate are fixed on the mobile platen. The upper punch can be moved up and down in the blank inside the inner sleeve. The molding method of the device includes: making a billet; assembling an extrusion die; lubricating the extrusion die; preheating the extrusion die; heating the billet; However, due to the problem of the mold itself, this patent has the problem that it is not easy to demold.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a crank extrusion molding device and crank extrusion molding method that is easy to demould in order to overcome the above-mentioned defects in the prior art, which can effectively perform extrusion molding work on high-temperature crank blanks , and after the extrusion work is completed, each working part can be easily evacuated to form a complete crank product.

The object of the present invention can be realized through the following technical solutions:

The invention provides a crank extrusion molding device which is easy to demould, which is used for processing a high-temperature crank blank to be extruded into a crank rough product, comprising a working plate, a first a working part and a second working part, a third working part and a fourth working part arranged on the other two opposite sides of the working plate, and a fifth working part arranged above the working plate;

The work plate is used to place the high-temperature crank blank to be extruded, and is consistent with the vertical projection of the crank rough product;

The first working part has a fixed thick plate whose front is close to the side wall of the working plate;

The third working part and the fourth working part are symmetrically arranged between the first working part and the second working part, and respectively have a third working part push plate and a fourth working part push plate that can approach and move away from each other;

The fifth working part has an upper pressing plate that can move up and down, and the upper pressing plate is provided with a separating pressing plate that can move with the upper pressing plate and can move downward under the action of external force;

The fixed thick plate and the second working part push plate are also provided with hollow holes that match the holes on the two crank arms of the crank product, and the hollow holes of the fixed thick plate are provided with movable first holes. a hole-forming extrusion rod, a movable second hole-forming extrusion rod is pierced through the hollow hole of the push plate of the second working part;

By closing the second working part push plate, the third working part push plate and the fourth working part push plate to the working plate and the fixed thick plate, lowering the upper platen and pressing down the partition platen to form a shape matching the rough product of the crank The extrusion cavity is opened by retracting the second working part push plate, the third working part push plate and the fourth working part push plate, and raising the lower pressure plate and the separation pressure plate.

As the preferred technical scheme of the present invention:

The first working part also includes a first hole-forming hydraulic device and a retractable first hole-forming hydraulic push rod arranged on the first hole-forming hydraulic device, and the first hole-forming hydraulic push rod acts on the first hole-forming hydraulic push rod. The hole extrusion rod drives the first hole-forming extrusion rod to move in the hollow hole of the fixed thick plate;

The second working part also includes a second hole-forming hydraulic device and a retractable second hole-forming hydraulic push rod disposed on the second hole-forming hydraulic device, and the second hole-forming hydraulic push rod acts on the second hole-forming hydraulic push rod. The hole pressing rod drives the second hole forming pressing rod to move in the hollow hole of the push plate of the second working part.

As a preferred technical solution of the present invention, the first working part further includes a first thick plate reinforcing rib and a second thick plate reinforcing rib for supporting and fixing the back of the thick plate.

As a preferred technical solution of the present invention, the second working part further comprises a second working part hydraulic device and a retractable second working part hydraulic push rod A and a second working part arranged on the second working part hydraulic device The hydraulic push rod B, the second working part hydraulic push rod A and the second working part hydraulic push rod B act together on the second working part push plate to drive the second working part push plate closer to and away from the fixed thick plate.

As a preferred technical solution of the present invention, the front of the third working part push plate faces the working plate, and the third working part further comprises a third working part base arranged on the back of the third working part push plate, fixed on the third working part The third working part hydraulic device on the base and the retractable third working part hydraulic push rod arranged on the third working part hydraulic device, the third working part hydraulic push rod acting on the third working part push plate The back side drives the push plate of the third working part to move.

As a preferred technical solution of the present invention, the third working part push plate is provided with a third working part push plate forming protrusion that matches the shape of the defect at the bottom of the thick crank product.

As a preferred technical solution of the present invention, the bottom of the upper pressing plate is in a semi-circular shape suitable for the shape of the upper part of the thick crank product; in a natural state, the top of the separating pressing plate protrudes from the top of the upper pressing plate, and the bottom of the separating pressing plate and the bottom of the upper pressing plate are Flat and matching shapes.

As a preferred technical solution of the present invention, the fifth working part further comprises a fifth working part hydraulic device fixed inside the fixed thick plate, a fifth working part hydraulic device connected to the fifth working part hydraulic device and extending from the top of the fixed thick plate A hydraulic lifting rod and a second hydraulic lifting rod, the first hydraulic lifting rod and the second hydraulic lifting rod act together on the upper pressure plate to drive the upper pressure plate to move up and down.

The present invention also provides a crank extrusion molding method that is easy to demould, adopts the crank extrusion molding device, and the method includes the following steps:

S1: keep the extrusion cavity open;

S2: Place the high-temperature crank blank to be extruded on the working plate through external lifting equipment;

S3: The upper pressing plate and the separating pressing plate are lowered and pressed against the upper end of the high-temperature crank blank;

S4: The push plate of the third working part and the push plate of the fourth working part move towards each other and contact the high-temperature crank blank;

S5: The second working part push plate moves toward the fixed thick plate, contacts the high-temperature crank blank and extrudes until the second working part push plate contacts the side wall of the working plate, stops extruding and keeps its position unchanged;

S6: The third working part push plate and the fourth working part push plate extrude the high-temperature crank blank until the third working part push plate and the fourth working part push plate contact the side wall of the working plate, stop the extrusion and keep the position unchanged;

S7: The upper platen and the separating platen extrude the high-temperature crank blank. After reaching the preset extrusion position, the movement is stopped, and then the partition platen is moved downward by an external press to insert the high-temperature crank blank for extrusion. , after reaching the preset extrusion position, stop the movement;

S8: The first hole-forming extrusion rod and the second hole-forming extrusion rod move toward each other until they contact the separating platen, stop the movement, and extrude two holes on the high-temperature crank blank;

S9: After cooling, get a thick crank product, withdraw the separating platen, retract the first hole-forming extrusion rod and the second hole-forming extrusion rod, and then retract the second working part push plate and the third working part push plate And the fourth working part push plate, lift the upper platen and the separation platen, and the rough product demoulding is completed;

S10: Send the cranked rough product away from the cranked extrusion forming device through the external lifting equipment.

As a preferred technical solution of the present invention, in the process of steps S1-S7, keep the end of the first hole-forming extrusion rod and the side of the fixed thick plate facing the high-temperature crank blank to form a complete plane; in the process of steps S5-S7, keep the first The end of the two-hole extrusion rod and the side of the second working part push plate facing the high-temperature crank blank form a complete plane.

Compared with the prior art, the present invention can effectively extrude the high-temperature blank of the crank through the cooperative operation of the five working parts, and after the extrusion work is completed, each working part can be easily evacuated to form a complete Rough product. The invention can effectively extrude the crank, and is easy to demould without causing difficulty in taking out the mold or the forging, and the holes on the crank arm are also extruded synchronously, which saves the workload of subsequent machining.

Description of drawings

Fig. 1 is the structural representation of the crank-bend extrusion molding device that is easy to demould according to the present invention;

Fig. 2 is the top-view structural schematic diagram of the crank extrusion molding device that is easy to demould according to the present invention;

3 is a schematic structural diagram of the first working part and the fifth working part of the present invention from a frontal perspective;

4 is a schematic structural diagram of the first working part and the fifth working part from the back perspective of the present invention;

5 is a schematic structural diagram of the second working part of the present invention;

FIG. 6 is a top-view structural schematic diagram of the second working part of the present invention;

7 is a schematic structural diagram of the third working part and the fourth working part of the present invention;

Fig. 8 is the front view structure schematic diagram of the third working part and the fourth working part of the present invention;

Fig. 9 is the structure schematic diagram of the separation pressing plate of the present invention;

10 is a schematic structural diagram of a high-temperature crank blank part of the present invention;

FIG. 11 is a schematic structural diagram of a crank-turned rough product of the present invention.

In the figure, 000 is the bottom plate, 001 is the working plate, 100 is the first working part, 101 is the fixed thick plate, 102 is the first thick plate reinforcing rib, 103 is the second thick plate reinforcing rib, 104 is the first hole-forming hydraulic pressure Device, 105 is the first hole-forming hydraulic push rod, 106 is the first hole-forming extrusion rod, 200 is the second working part, 201 is the second working part push plate, 202 is the second working part hydraulic push rod A, 203 204 is the second working part hydraulic device, 205 is the second hole-forming hydraulic device, 206 is the second hole-forming hydraulic push rod, 207 is the second hole-forming extrusion rod, 300 is the second hole-forming hydraulic push rod B The third working part, 301 is the third working part push plate, 302 is the forming protrusion of the third working part push plate, 303 is the third working part base, 304 is the third working part hydraulic device, 305 is the third working part hydraulic pressure Push rod, 400 is the fourth working part, 401 is the fourth working part push plate, 402 is the fourth working part push plate forming protrusion, 404 is the fourth working part base, 404 is the fourth working part hydraulic device, 405 is the fourth working part hydraulic device The hydraulic push rod of the fourth working part, 500 is the fifth working part, 501 is the upper pressure plate, 502 is the separating pressure plate, 503 is the bottom of the separating pressure plate, 504 is the first hydraulic lifting rod, 505 is the second hydraulic lifting rod, 600 is the high temperature Crank crank blank, 700 is crank crank rough product, 701 is crank arm.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

A crank extruding device that is easy to demould, as shown in Figures 1 to 11, is used to process a high temperature crank crank blank 600 to be extruded into a crank crank rough product 700, characterized in that it includes a working plate 001 , the first working part 100 and the second working part 200 arranged on two opposite sides of the working plate 001, the third working part 300 and the fourth working part 400 arranged on the other two opposite sides of the working plate 001, and the The fifth work section 500 above 001;

in:

The working plate 001 is used to place the high-temperature crank blank 600 to be extruded, and is consistent with the vertical projection of the crank rough product 700;

The first working part 100 has a fixed thick plate 101 whose front is close to the side wall of the working plate 001 ; ;

The third working part 300 and the fourth working part 400 are symmetrically arranged between the first working part 100 and the second working part 200 , and respectively have a third working part push plate 301 and a fourth working part push plate that can approach and separate from each other. 401;

The fifth working part 500 has an upper pressing plate 501 that can move up and down, and the upper pressing plate 501 is provided with a separating pressing plate 502 that can move with the upper pressing plate 501 and can move downward under the action of external force;

The fixed thick plate 101 and the second working part push plate 201 are also provided with hollow holes that match the holes on the two crank arms 701 of the cranked thick product 700, and the hollow holes of the fixed thick plate 101 are provided with movable holes. The first hole-forming extrusion rod 106 (the diameter of the crank extruded package matches the hole diameter of the hollow hole of the fixed thick plate 101), and the hollow hole of the second working part push plate 201 is provided with a movable first hole. Two-hole extrusion rod 207 (the diameter of the hollow hole of the fixed thick plate 101 matches the diameter of the hollow hole of the second working part push plate 201);

By closing the second working part push plate 201 , the third working part push plate 301 and the fourth working part push plate 401 to the working plate 001 and the fixed thick plate 101 , lowering the upper platen 501 and pressing down the partition platen 502 , the The extrusion cavity with the matching shape of the cranked rough product 700; by retracting the second working part push plate 201, the third working part push plate 301 and the fourth working part push plate 401, and raising the lower pressure plate 501 and the separation pressure plate 502, open the extrusion cavity.

More specifically:

In this embodiment, preferably the working plate 001 (horizontal arrangement), the first working part 100 , the second working part 200 , the third working part 300 and the fourth working part 400 are arranged on the horizontal base plate 000 , and the fifth working part 500 set on the first working part 100 .

In this embodiment, as shown in FIG. 1 , FIG. 3 , FIG. 4 and FIG. 5 , the first working part 100 further includes a first hole-forming hydraulic device 104 and a retractable first hydraulic device 104 disposed on the first hole-forming hydraulic device 104 . A hole-forming hydraulic push rod 105, the first hole-forming hydraulic push rod 105 acts on the first hole-forming extrusion rod 106 to drive the first hole-forming extrusion rod 106 to move in the hollow hole of the fixed thick plate 101; the second work The part 200 also includes a second hole-forming hydraulic device 205 and a retractable second hole-forming hydraulic push rod 206 disposed on the second hole-forming hydraulic device 205. The second hole-forming hydraulic push rod 206 acts on the second hole-forming hydraulic push rod 206 The extrusion rod 207 drives the second perforated extrusion rod 207 to move in the hollow hole of the second working part push plate 201 . More preferably, the first working part 100 further includes a first thick plate reinforcing rib 102 and a second thick plate reinforcing rib 103 for supporting and fixing the back surface of the thick plate 101 . The second working part 200 further includes a second working part hydraulic device 204 and a retractable second working part hydraulic push rod A202 and a second working part hydraulic push rod B203 arranged on the second working part hydraulic device 204. The first hydraulic push rod A202 and the second working section hydraulic push rod B203 act together on the second working section push plate 201 to drive the second working section push plate 201 to approach and move away from the fixed thick plate 101 .

In this embodiment, as shown in FIGS. 7 to 8 , the front of the third working part push plate 301 faces the working plate 001 , and the third working part 300 further includes a third working part base 303 disposed on the back of the third working part push plate 301 . , the third working part hydraulic device 304 fixed on the third working part base 303 and the retractable third working part hydraulic push rod 305 arranged on the third working part hydraulic device 304, the third working part hydraulic push rod 305 The third working part push plate 301 is driven to move by acting on the back of the third working part push plate 301 . Preferably, the third working part push plate 301 is provided with a third working part push plate forming protrusion 302 that matches the shape of the defect at the bottom of the rough crank product 700 . The bottom of the third working part push plate forming protrusion 302 is flush with the working plate 001 , and the width is the same as that of the working plate 001 .

In this embodiment, as shown in FIGS. 7 to 8 , the fourth working part 400 has the same structure as the third working part 300 . The front of the fourth working part push plate 401 faces the working plate 001 , and the fourth working part 400 further includes a fourth working part base 403 arranged on the back of the fourth working part push plate 401 , and a fourth working part base 403 fixed on the fourth working part base 403 . The working part hydraulic device 404 and the retractable fourth working part hydraulic push rod 405 arranged on the fourth working part hydraulic device 404, the fourth working part hydraulic push rod 405 is driven by acting on the back of the fourth working part push plate 401 The fourth working part push plate 401 moves. Preferably, the fourth working part push plate 401 is provided with a fourth working part push plate forming protrusion 402 that matches the shape of the defect at the bottom of the cranked rough product 700 . The bottom of the fourth working part push plate forming protrusion 402 is flush with the working plate 001 , and the width is the same as that of the working plate 001 .

In this embodiment, as shown in FIGS. 3 to 4 and FIG. 9 , the bottom of the upper pressing plate 501 is in the shape of a semi-circle that matches the shape of the upper part of the thick crank product 700 ; in a natural state, the top of the separating pressing plate 502 protrudes from the upper The top of the pressing plate 501 and the bottom 503 of the separating pressing plate are flush with the bottom of the upper pressing plate 501 and the shapes are matched. In this embodiment, it is preferable that the two do not move with each other due to the action of frictional force in a natural state, that is, the separating platen 502 will not fall down. The position of 502 in the natural state is shown in FIG. 3 . Preferably, the fifth working part 500 further comprises a fifth working part hydraulic device fixed inside the fixed thick plate 101 , a first hydraulic lifting rod 504 and a first hydraulic lifting rod 504 connected to the fifth working part hydraulic device and extending from the top of the fixed thick plate 101 . Two hydraulic lifting rods 505, the first hydraulic lifting rod 504 and the second hydraulic lifting rod 505 work together on the upper pressing plate 501 to drive the upper pressing plate 501 to move up and down.

An easy-to-release crank extrusion molding method based on the crank extrusion molding device, comprising the following steps:

S1: keep the extrusion cavity open;

S2: Place the high-temperature crank blank 600 to be extruded on the working plate 001 through the external lifting equipment;

S3: The upper pressing plate 501 and the separating pressing plate 502 are lowered and pressed against the upper end of the high-temperature crank blank 600;

S4: The third working part push plate 301 and the fourth working part push plate 401 move toward each other, and contact the high-temperature crank blank 600;

S5: The second working part push plate 201 moves towards the fixed thick plate 101, contacts the high-temperature crank blank 600 and extrudes until the second working part push plate 201 contacts the side wall of the working plate 001, stops extruding and keeps the position constant;

S6: The third working part push plate 301 and the fourth working part push plate 401 press the high-temperature crank blank 600 until the third working part push plate 301 and the fourth working part push plate 401 contact the side of the working plate 001 wall, stop squeezing and keep the same position;

S7: The upper pressing plate 501 and the separating pressing plate 502 extrude the high-temperature crank crank blank 600. After reaching the preset extrusion position, the movement is stopped, and then the partition pressing plate 502 is driven downward by an external press to be inserted into the high-temperature crank crank blank. 600, extrude, and stop moving after reaching the preset extruding position;

S8: The first hole-forming extrusion rod 106 and the second hole-forming extrusion rod 207 move toward each other until they contact the separating platen 502, stop the movement, and extrude two holes on the high-temperature crank blank 600;

S9: After cooling, the cranked rough product 700 is obtained, the separating platen 502 is withdrawn, the first hole-forming extrusion rod 106 and the second hole-forming extrusion rod 207 are retracted, and then the second working part push plate 201, the second hole-forming extrusion rod 207 are retracted The third working part push plate 301 and the fourth working part push plate 401, the upper platen 501 and the separating platen 502 are raised, and the rough product 700 is demolded;

S10: The cranked rough product 700 is sent away from the cranked extrusion forming device through an external lifting device.

Wherein, in the process of steps S1-S7, keep the end of the first hole-forming extrusion rod 106 and the side of the fixed thick plate 101 facing the high-temperature crank blank 600 to form a complete plane; in the process of steps S5-S7, keep the second hole-forming The end of the extrusion rod 207 and the side of the second working part push plate 201 facing the high-temperature crank blank 600 form a complete plane.

More specifically:

First, the second working part 200 , the third working part 300 and the fourth working part 400 all shrink the hydraulic push rod to the limit state, driving the second working part push plate 201 , the second hole-forming extrusion rod 207 , and the third working part. Both the first push plate 301 and the fourth working portion push plate 401 are retracted to the limit state, leaving the middle area. In the fifth working part 500 , the upper pressing plate 501 and the separating pressing plate 502 are raised to the upper limit position under the action of the first hydraulic lifting rod 504 and the second hydraulic lifting rod 505 .

Then, the high-temperature crank blank 600 (as shown in FIG. 10 ) heated to a preset temperature is placed on the working plate 001 by external lifting equipment, and then the first hole-forming extrusion rod 106 is pressed in the first hole-forming hydraulic pressure. Under the action of the device 104 and the first hole-forming hydraulic push rod 105, the device 104 protrudes outward until the end face is level with the surface of the fixed thick plate 101 near the side of the high-temperature crank blank, and the movement is stopped. At this time, the entire surface of the fixed thick plate 101 is With the effect of forming a complete plane, the hollow hole is blocked by the first hole-forming extrusion rod 106 . Then the first hydraulic lifting rod 504 and the second hydraulic lifting rod 505 move downward, so that the upper pressing plate 501 and the separating pressing plate 502 press the upper end of the high temperature crank blank 600 to prevent it from moving up and down in the subsequent extrusion operation. Then the third working part hydraulic device 304 and the fourth working part hydraulic device 404 respectively drive the third working part hydraulic push rod 305 and the fourth working part hydraulic push rod 405 to extend outward, driving the third working part push plate 301 and the fourth working part hydraulic push rod 405 The four working part push plates 401 move toward each other, and when the third working part push plate forming protrusion 302 and the fourth working part push plate forming protrusion 402 contact the high temperature blank parts, the movement is suspended. The second working part hydraulic device 204 drives the second working part hydraulic push rod A202 and the second working part hydraulic push rod B203 to extend outward, and drives the second working part push plate 201 to move forward. At the same time, the extrusion rod 207 Under the action of the hydraulic device 205 and the hydraulic push rod 206, it advances synchronously with the push plate 201, and keeps the end surface and the side of the push plate 201 close to the high-temperature blank, so that the entire surface forms a complete plane effect, and the hole is blocked by the second The hole-forming extrusion rod 207 is blocked. Move to contact with the high temperature crank blank 600 and extrude, when the second working part push plate 201 contacts the side wall of the work plate 001, stop extruding and keep the position unchanged. The third working part push plate 301 and the fourth working part push plate 401 start to squeeze until the third working part push plate forming protrusion 302 and the fourth working part push plate forming protrusion 402 are completely inserted into the high temperature crank blank 600 and the Between the working plates 001, when the third working part push plate 301 and the fourth working part push plate 401 are both in contact with the side wall of the working plate 001, the extrusion is stopped and the positions remain unchanged. The upper pressing plate 501 and the separating pressing plate 502 begin to move downward under the action of the external press, and squeeze the high-temperature crank blank 600 in the vertical direction, so that the head of the high-temperature crank blank 600 becomes a semicircle. After reaching the predetermined squeeze position, stop the movement. Then the partition platen 502 starts to move downward independently under the action of the external press, so that the bottom part 503 of the partition platen is inserted into the middle of the high-temperature crank blank 600, and is continuously pressed down, and stops moving when it reaches the predetermined extrusion position. Then the first hole-forming extrusion rod 106 and the second hole-forming extrusion rod 207 continue to move toward each other, extruding the high-temperature crank blank 600, and extruding two holes on it until the first hole-forming extrusion rod 106 and the second hole-forming extrusion rod 207 come into contact with the separating platen 502 (or have been extremely close to 502 and cannot continue to be compressed), and stop moving. At this time, the cranked rough product 700 has been extruded and formed, and after cooling, it begins to evacuate from each working part. First, the separating platen 502 moves upwards and leaves the cranked rough product 700. Due to the limitation of the upper platen 501 and the first hole-forming extrusion rod 106 and the second hole-forming extrusion rod 207 to the crank, the separation pressure plate 502 is evacuated. Does not cause the crank to move. Then the first hole-forming extrusion rod 106 and the second hole-forming extrusion rod 207 are retracted and withdrawn. Then the second working part push plate 201 is withdrawn backward, the third working part push plate 301 and the fourth working part push plate 401 are withdrawn backward, and finally the upper pressure plate 501 and the separating pressure plate 502 move upward and leave the crank surface. At this time, the crude crank product 700 formed by extrusion has been completely separated from the device, and the effect of the crude crank product 700 is shown in FIG. 11 . Subsequently, only the rough product 700 of the crankshaft is transported away by the external lifting device, and the final product of the crankshaft can be obtained by further finishing.

The foregoing description of the embodiments is provided to facilitate understanding and use of the invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the generic principles described herein can be applied to other embodiments without inventive step. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (9)

1. A crank extrusion forming method easy to demold is characterized in that a crank extrusion forming device easy to demold is adopted and used for processing a high-temperature crank blank (600) to be extruded into a crank rough product (700), and the crank extrusion forming device comprises a working plate (001), a first working part (100) and a second working part (200) which are arranged on two opposite sides of the working plate (001), a third working part (300) and a fourth working part (400) which are arranged on the other two opposite sides of the working plate (001) and a fifth working part (500) which is arranged above the working plate (001);

the working plate (001) is used for placing a high-temperature crank throw blank (600) to be extruded and is consistent with the vertical projection of the crank throw rough product (700);

the first working part (100) is provided with a fixed thick plate (101) with the front surface closely attached to the side wall of the working plate (001), and the second working part (200) is provided with a second working part push plate (201) which is arranged opposite to the fixed thick plate (101) and can be close to and far away from the fixed thick plate (101);

the third working part (300) and the fourth working part (400) are symmetrically arranged between the first working part (100) and the second working part (200) and are respectively provided with a third working part push plate (301) and a fourth working part push plate (401) which can be close to and far away from each other;

the fifth working part (500) is provided with an upper pressure plate (501) capable of moving up and down, and a separating pressure plate (502) capable of moving along with the upper pressure plate (501) and moving down under the action of external force penetrates through the upper pressure plate (501);

hollow holes matched with holes on two crank arms (701) of the crank throw rough product (700) are further formed in the fixed thick plate (101) and the second working part push plate (201), a movable first hole forming extrusion rod (106) penetrates through the hollow holes of the fixed thick plate (101), and a movable second hole forming extrusion rod (207) penetrates through the hollow holes of the second working part push plate (201);

the second working part push plate (201), the third working part push plate (301) and the fourth working part push plate (401) are folded towards the working plate (001) and the fixed thick plate (101), the upper pressing plate (501) is lowered, and the separating pressing plate (502) is pressed downwards to form an extrusion cavity matched with the shape of the crank throw rough product (700); the second working part push plate (201), the third working part push plate (301) and the fourth working part push plate (401) are retracted, the lower press plate (501) and the separating press plate (502) are lifted, and the extrusion cavity is opened;

the crank extrusion forming method easy to demould comprises the following steps:

s1: keeping the extrusion cavity open;

s2: placing a high-temperature crank throw blank (600) to be extruded on a working plate (001) through external hoisting equipment;

s3: the upper pressing plate (501) and the separating pressing plate (502) descend and are pressed at the upper end of the high-temperature crank throw blank (600);

s4: the third working part push plate (301) and the fourth working part push plate (401) move oppositely and contact the high-temperature crank throw blank (600);

s5: the second working part push plate (201) moves towards the fixed thick plate (101), contacts the high-temperature crank throw blank (600) and extrudes until the second working part push plate (201) contacts the side wall of the working plate (001), and extrusion is stopped and the position is kept unchanged;

s6: the third working part push plate (301) and the fourth working part push plate (401) extrude the high-temperature crank throw blank (600) until the third working part push plate (301) and the fourth working part push plate (401) contact the side wall of the working plate (001), extrusion is stopped, and the position is kept unchanged;

s7: the upper pressing plate (501) and the separating pressing plate (502) extrude the high-temperature crank throw blank (600), the high-temperature crank throw blank stops moving after reaching a preset extrusion position, then the separating pressing plate (502) is driven by an external press machine to independently move downwards to be inserted into the high-temperature crank throw blank (600) for extrusion, and the high-temperature crank throw blank stops moving after reaching the preset extrusion position;

s8: the first hole-forming extrusion rod (106) and the second hole-forming extrusion rod (207) move oppositely until contacting the separating pressing plate (502), the movement is stopped, and two holes are extruded on the high-temperature crank throw blank (600);

s9: after cooling, obtaining a crank throw rough product (700), withdrawing the separating pressing plate (502), retracting the first hole-forming extrusion rod (106) and the second hole-forming extrusion rod (207), then retracting the second working part push plate (201), the third working part push plate (301) and the fourth working part push plate (401), raising the upper pressing plate (501) and the separating pressing plate (502), and demoulding the crank throw rough product (700);

s10: the crank throw crude product (700) is delivered out of the crank throw extrusion forming device through external hoisting equipment.

2. The easy-to-demold bell crank extrusion molding method of claim 1 wherein:

the first working part (100) further comprises a first hole forming hydraulic device (104) and a first telescopic hole forming hydraulic push rod (105) arranged on the first hole forming hydraulic device (104), wherein the first hole forming hydraulic push rod (105) drives the first hole forming extrusion rod (106) to move in the hollow hole of the fixed thick plate (101) by acting on the first hole forming extrusion rod (106);

the second working part (200) further comprises a second hole forming hydraulic device (205) and a telescopic second hole forming hydraulic push rod (206) arranged on the second hole forming hydraulic device (205), and the second hole forming hydraulic push rod (206) drives the second hole forming extrusion rod (207) to move in a hollow hole of the second working part push plate (201) by acting on the second hole forming extrusion rod (207).

3. The method of claim 1 or 2, wherein the first working portion (100) further comprises a first plank reinforcement rib (102) and a second plank reinforcement rib (103) for supporting the back surface of the fixed plank (101).

4. The easy-to-demold bell crank extrusion molding method according to claim 1 or 2, wherein the second working part (200) further comprises a second working part hydraulic device (204) and a second telescopic working part hydraulic push rod a (202) and a second working part hydraulic push rod B (203) which are arranged on the second working part hydraulic device (204), and the second working part hydraulic push rod a (202) and the second working part hydraulic push rod B (203) drive the second working part push plate (201) to approach and depart from the fixed thick plate (101) by jointly acting on the second working part push plate (201).

5. The bell crank extrusion molding method easy to demold as claimed in claim 1, wherein the front surface of the third working part pushing plate (301) faces the working plate (001), the third working part (300) further comprises a third working part base (303) disposed on the back surface of the third working part pushing plate (301), a third working part hydraulic device (304) fixed on the third working part base (303), and a retractable third working part hydraulic push rod (305) disposed on the third working part hydraulic device (304), and the third working part hydraulic push rod (305) drives the third working part pushing plate (301) to move by acting on the back surface of the third working part pushing plate (301).

6. The easy-to-demold bell crank extrusion molding method as claimed in claim 1 or 5, wherein the third working portion pushing plate (301) is provided with a third working portion pushing plate molding protrusion (302) matching with the shape of the bottom defect of the bell crank rough product (700).

7. The easy-to-demold bell crank extrusion molding method as set forth in claim 1 wherein the bottom of the upper press plate (501) is in a semicircular shape corresponding to the shape of the upper portion of the bell crank preform (700); in a natural state, the top of the separating pressing plate (502) protrudes out of the top of the upper pressing plate (501), and the bottom (503) of the separating pressing plate is flush with the bottom of the upper pressing plate (501) and matched in shape.

8. The easy-to-demold bell crank extrusion molding method of claim 7 wherein the fifth working part (500) further comprises a fifth working part hydraulic device fixed inside the fixed thick plate (101), a first hydraulic lifting rod (504) and a second hydraulic lifting rod (505) connected to the fifth working part hydraulic device and extending from the top of the fixed thick plate (101), the first hydraulic lifting rod (504) and the second hydraulic lifting rod (505) acting together on the upper pressing plate (501) to move the upper pressing plate (501) up and down.

9. The method of claim 1, wherein during steps S1-S7, the end of the first hole-forming extrusion rod (106) and the side of the fixed slab (101) facing the high temperature crank blank (600) are maintained to form a complete plane; and in the processes of the steps S5-S7, the tail end of the second hole forming extrusion rod (207) and one surface of the second working part push plate (201) facing the high-temperature crank throw blank (600) are kept to form a complete plane.

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