CN110695110B - Crank extrusion forming device easy to demould and crank extrusion forming method - Google Patents

Crank extrusion forming device easy to demould and crank extrusion forming method Download PDF

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Publication number
CN110695110B
CN110695110B CN201910942546.1A CN201910942546A CN110695110B CN 110695110 B CN110695110 B CN 110695110B CN 201910942546 A CN201910942546 A CN 201910942546A CN 110695110 B CN110695110 B CN 110695110B
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working part
plate
working
extrusion
crank
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CN110695110A (en
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辛绍杰
周菊明
周建华
姜锐红
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Shanghai Dianji University
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Shanghai Dianji University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00Profiling tools for metal extruding

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

Crank extrusion forming device easy to demould and crank extrusion forming method
Technical Field
The invention belongs to the field of mechanical engineering, relates to a crank extrusion forming device and a crank extrusion forming method easy to demould, and particularly relates to a device and a method capable of effectively carrying out extrusion forming on a crank, easy to demould and incapable of causing a die or a forge piece to be difficult to take out.
Background
The large-scale marine crankshaft has the advantages of heavy weight, high requirement on machining precision and high manufacturing technical difficulty, and is a very important core component in the marine industry. The crank throw is a key component of a marine crankshaft, a forging method of a single large crank throw usually adopts a block forging method, a ring forging method, a die forging method, an upsetting method, a bending method and other primary manufacturing methods, after the primary manufacturing, a high-temperature blank is made into a crank throw rough product, and then the finish machining is carried out by a machine tool/a machining center and the like, so as to form a final crank throw product.
Through a large number of example investigations, the following disadvantages exist in the current forging process for the bell crank:
the block forging method has the advantages of large machining allowance, high cost, difficult quality reaching standards and high rejection rate; the ring forging method has high requirements on the operating skills of equipment and workers and is not easy to realize in production; the die forging method extrudes the high-temperature blank raw material in the processing process, so that the extrusion force between the die forging method and the die cavity is large, the die is difficult to separate after the extrusion is finished, and the crank throw is difficult to take out; the manufacturing cost in the upsetting method is too high, and the upsetting method is not suitable for small-batch production; the bending forging method is widely applied at present, but the machining process is complex and the machining period is long.
Chinese patent CN109014010A discloses an extrusion forming device and a forming method for a marine low-speed diesel engine crank forging, wherein the extrusion forming device comprises an extrusion inner sleeve, an outer sleeve, an upper punch and a movable platen, the center positions of the extrusion inner sleeve, the outer sleeve and the movable platen correspond to each other, the outer sleeve is positioned on the outer side of the extrusion inner sleeve, the extrusion inner sleeve comprises an inner sleeve body and an inner sleeve bottom plate positioned at the bottom of the inner sleeve body, the outer sleeve body and the inner sleeve bottom plate are fixed on the movable platen, and the upper punch can be arranged in a blank in the inner sleeve in an up-and-down. The molding method of the device comprises the following steps: preparing a blank; assembling an extrusion die; lubricating an extrusion die; preheating an extrusion die; heating the blank; removing phosphorus; extrusion molding; and (6) demolding. However, this patent has a problem that it is not easy to release the mold due to its own problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the crank extrusion forming device and the crank extrusion forming method which are easy to demould, so that the high-temperature crank blank can be effectively extruded and formed, and after the extrusion is finished, all working parts can be easily evacuated to form a complete crank rough product.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a crank extrusion forming device easy to demould, which is used for processing a high-temperature crank blank to be extruded into a crank rough product and comprises a working plate, a first working part, a second working part, a third working part, a fourth working part and a fifth working part, wherein the first working part and the second working part are arranged on two opposite sides of the working plate;
the working plate is used for placing a high-temperature crank throw blank to be extruded and is consistent with the vertical projection of a crank throw rough product;
the first working part is provided with a fixed thick plate with the front surface clinging to the side wall of the working plate, and the second working part is provided with a second working part push plate which is arranged opposite to the fixed thick plate and can be close to and far away from the fixed thick plate;
the third working part and the fourth working part are symmetrically arranged between the first working part and the second working part and are respectively provided with a third working part push plate and a fourth working part push plate which can be close to and far away from each other;
the fifth working part is provided with an upper pressure plate capable of moving up and down, and a separation pressure plate capable of moving along with the upper pressure plate and moving down under the action of external force penetrates through the upper pressure plate;
the fixed thick plate and the second working part push plate are also provided with hollow holes matched with holes on two crank arms of a crank throw rough product, a movable first hole forming extrusion rod penetrates through the hollow holes of the fixed thick plate, and a movable second hole forming extrusion rod penetrates through the hollow holes of the second working part push plate;
the second working part push plate, the third working part push plate and the fourth working part push plate are folded towards the working plate and the fixed thick plate, the upper press plate is lowered, and the separating press plate is pressed downwards to form an extrusion cavity matched with the shape of a crank throw thick product; the second working part push plate, the third working part push plate and the fourth working part push plate are retracted, the lower pressing plate and the separating pressing plate are lifted, and the extrusion cavity is opened.
As a preferred technical scheme of the invention:
the first working part also comprises a first hole forming hydraulic device and a telescopic first hole forming hydraulic push rod arranged on the first hole forming hydraulic device, and the first hole forming hydraulic push rod drives the first hole forming extrusion rod to move in the hollow hole of the fixed thick plate by acting on the first hole forming extrusion rod;
the second working part further comprises a second hole forming hydraulic device and a telescopic second hole forming hydraulic push rod arranged on the second hole forming hydraulic device, and the second hole forming hydraulic push rod drives the second hole forming extrusion rod to move in the hollow hole of the second working part push plate through acting on the second hole forming extrusion rod.
As a preferred embodiment of the present invention, the first working portion further includes a first thick plate reinforcing rib and a second thick plate reinforcing rib for supporting and fixing the back surface of the thick plate.
As a preferable technical solution of the present invention, the second working portion further includes a second working portion hydraulic device, and a second working portion hydraulic push rod a and a second working portion hydraulic push rod B which are retractable and arranged on the second working portion hydraulic device, and the second working portion hydraulic push rod a and the second working portion hydraulic push rod B drive the second working portion push plate to approach and leave the fixed thick plate by acting on the second working portion push plate together.
As a preferable technical solution of the present invention, the front surface of the third working portion pushing plate faces the working plate, the third working portion further includes a third working portion base disposed on the back surface of the third working portion pushing plate, a third working portion hydraulic device fixed on the third working portion base, and a retractable third working portion hydraulic pushing rod disposed on the third working portion hydraulic device, and the third working portion hydraulic pushing rod drives the third working portion pushing plate to move by acting on the back surface of the third working portion pushing plate.
As the preferable technical scheme of the invention, the third working part push plate is provided with a third working part push plate forming bulge matched with the shape of the bottom defect of the crank throw rough product.
As the preferred technical scheme of the invention, the bottom of the upper pressure plate is in a semicircular shape which is matched with the shape of the upper part of the crank throw rough product; under the natural state, the top of the separating pressing plate protrudes out of the top of the upper pressing plate, and the bottom of the separating pressing plate is flush with the bottom of the upper pressing plate and matched in shape.
As a preferable technical solution of the present invention, the fifth working part further includes a fifth working part hydraulic device fixed inside the fixed thick plate, and a first hydraulic lifting rod and a second hydraulic lifting rod connected to the fifth working part hydraulic device and extending from the top of the fixed thick plate, and the first hydraulic lifting rod and the second hydraulic lifting rod jointly act on the upper pressing plate to drive the upper pressing plate to move up and down.
The invention also provides a crank extrusion forming method easy to demould, which adopts the crank extrusion forming device and comprises the following steps:
s1: keeping the extrusion cavity open;
s2: placing the high-temperature crank throw blank to be extruded on a working plate through external hoisting equipment;
s3: the upper pressing plate and the separating pressing plate descend and are pressed at the upper end of the high-temperature crank throw blank;
s4: the third working part push plate and the fourth working part push plate move oppositely and contact the high-temperature crank throw blank;
s5: the second working part push plate moves towards the fixed thick plate, contacts the high-temperature crank throw blank and extrudes the high-temperature crank throw blank until the second working part push plate contacts the side wall of the working plate, and stops extruding and keeps the position unchanged;
s6: the third working part push plate and the fourth working part push plate extrude the high-temperature crank throw blank until the third working part push plate and the fourth working part push plate contact the side wall of the working plate, and the extrusion is stopped and the position is kept unchanged;
s7: the upper pressing plate and the separating pressing plate extrude the high-temperature crank throw blank, the high-temperature crank throw blank stops moving after reaching a preset extrusion position, then the separating pressing plate is driven by an external press to independently move downwards to be inserted into the high-temperature crank throw blank for extrusion, and the high-temperature crank throw blank stops moving after reaching the preset extrusion position;
s8: the first hole forming extrusion rod and the second hole forming extrusion rod move oppositely until the first hole forming extrusion rod and the second hole forming extrusion rod contact the separating pressing plate, the movement is stopped, and two holes are extruded on the high-temperature crank throw blank;
s9: cooling to obtain a crank throw rough product, withdrawing the separating pressing plate, retracting the first hole forming extrusion rod and the second hole forming extrusion rod, then retracting the second working part push plate, the third working part push plate and the fourth working part push plate, lifting the upper pressing plate and the separating pressing plate, and finishing demoulding of the crank throw rough product;
s10: and conveying the crank throw rough product away from the crank throw extrusion forming device through external hoisting equipment.
As a preferable technical scheme of the invention, in the process of the steps S1-S7, the tail end of the first hole forming extrusion rod and one surface of the fixed thick plate facing to the high-temperature crank throw blank form a complete plane; and in the processes of the steps S5-S7, the tail end of the second hole-forming extrusion rod and one surface of the second working part push plate facing to the high-temperature crank throw blank form a complete plane.
Compared with the prior art, the extrusion forming device has the advantages that the five working parts are matched, the extrusion forming work can be effectively carried out on the high-temperature crank throw blank, and after the extrusion forming work is completed, all the working parts can be easily withdrawn, so that a complete crank throw rough product is formed. The invention can effectively extrude and mold the crank, is easy to demould, cannot cause that a mold or a forge piece is difficult to take out, and can synchronously extrude and mold the holes on the crank arm, thereby saving the workload of subsequent machining.
Drawings
FIG. 1 is a schematic structural view of an easy-to-demold bell crank extrusion molding apparatus of the present invention;
FIG. 2 is a schematic top view of the apparatus for forming a bell crank extrusion easy to demold according to the present invention;
FIG. 3 is a schematic structural view of the first and fifth working portions of the present invention from a front perspective;
FIG. 4 is a schematic back view of the first and fifth working portions of the present invention;
FIG. 5 is a schematic structural view of a second working portion according to the present invention;
FIG. 6 is a schematic top view of a second working portion according to the present invention;
FIG. 7 is a schematic structural view of a third working portion and a fourth working portion of the present invention;
FIG. 8 is a schematic front view of the third and fourth working parts of the present invention;
FIG. 9 is a schematic view of the construction of the divider platen of the present invention;
FIG. 10 is a schematic structural view of a high temperature bell crank blank of the present invention;
FIG. 11 is a schematic structural view of a throw rough product of the present invention.
In the drawing, 000 is a bottom plate, 001 is a working plate, 100 is a first working portion, 101 is a fixed thick plate, 102 is a first thick plate reinforcing rib, 103 is a second thick plate reinforcing rib, 104 is a first hole forming hydraulic device, 105 is a first hole forming hydraulic ram, 106 is a first hole forming extrusion stem, 200 is a second working portion, 201 is a second working portion ram, 202 is a second working portion hydraulic ram a, 203 is a second working portion hydraulic ram B, 204 is a second working portion hydraulic device, 205 is a second hole forming hydraulic device, 206 is a second hole forming hydraulic ram, 207 is a second hole forming extrusion stem, 300 is a third working portion, 301 is a third working portion ram, 302 is a third working portion ram forming projection, 303 is a third working portion base, 304 is a third working portion hydraulic device, 305 is a third working portion hydraulic ram, 400 is a fourth working portion, 401 is a fourth working portion ram, 402 is a fourth working portion ram forming projection, 404 is a fourth working part base, 404 is a fourth working part hydraulic device, 405 is a fourth working part hydraulic push rod, 500 is a fifth working part, 501 is an upper press plate, 502 is a separation press plate, 503 is a separation press plate bottom, 504 is a first hydraulic lifting rod, 505 is a second hydraulic lifting rod, 600 is a high-temperature crank throw blank, 700 is a crank throw rough product, and 701 is a crank arm.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A crank extrusion forming device easy to demould is used for processing a high-temperature crank blank 600 to be extruded into a crank rough product 700 as shown in figures 1-11, and is characterized by comprising a working plate 001, a first working part 100 and a second working part 200 which are arranged at two opposite sides of the working plate 001, a third working part 300 and a fourth working part 400 which are arranged at the other two opposite sides of the working plate 001, and a fifth working part 500 which is arranged above the working plate 001;
wherein:
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 pressing plate 501 capable of moving up and down, and a separating pressing plate 502 capable of moving along with the upper pressing plate 501 and moving downwards under the action of external force penetrates through the upper pressing plate 501;
hollow holes matched with holes in two crank arms 701 of the crank coarse 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 is arranged in the hollow holes of the fixed thick plate 101 in a penetrating mode (the diameter of the crank extrusion molding is matched with the aperture of the hollow holes of the fixed thick plate 101), and a movable second hole-forming extrusion rod 207 is arranged in the hollow holes of the second working part push plate 201 in a penetrating mode (the diameter of the hollow holes of the fixed thick plate 101 is matched with the aperture of 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 press plate 501 is lowered, and the separating press plate 502 is pressed downwards to form an extrusion cavity matched with the shape of the crank throw rough product 700; the pressing chamber is opened by retracting the second working portion pushing plate 201, the third working portion pushing plate 301, and the fourth working portion pushing plate 401, and raising the lower pressing plate 501 and the partition pressing plate 502.
More specifically:
in this embodiment, it is preferable that the work plate 001 (horizontally disposed), the first work section 100, the second work section 200, the third work section 300, and the fourth work section 400 are provided on a horizontal bottom plate 000, and the fifth work section 500 is provided on the first work section 100.
In this embodiment, as shown in fig. 1, fig. 3, fig. 4 and fig. 5, the first working portion 100 further includes a first hole-forming hydraulic device 104 and a first telescopic hole-forming hydraulic push rod 105 disposed on the first hole-forming hydraulic device 104, and 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 second telescopic 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 the hollow hole of the second working part push plate 201 by acting on the second hole forming extrusion rod 207. Still further preferably, the first working part 100 further comprises a first thick-plate reinforcing rib 102 and a second thick-plate reinforcing rib 103 for supporting the back surface of the fixed thick plate 101. The second working portion 200 further includes a second working portion hydraulic device 204, and a retractable second working portion hydraulic push rod a202 and a retractable second working portion hydraulic push rod B203 which are arranged on the second working portion hydraulic device 204, and the second working portion hydraulic push rod a202 and the retractable second working portion hydraulic push rod B203 drive the second working portion push plate 201 to approach and leave the fixed thick plate 101 by acting on the second working portion push plate 201 together.
In this embodiment, as shown in fig. 7 to 8, the front surface of the third working portion pushing plate 301 faces the working plate 001, the third working portion 300 further includes a third working portion base 303 disposed on the back surface of the third working portion pushing plate 301, a third working portion hydraulic device 304 fixed on the third working portion base 303, and a retractable third working portion hydraulic pushing rod 305 disposed on the third working portion hydraulic device 304, and the third working portion hydraulic pushing rod 305 drives the third working portion pushing plate 301 to move by acting on the back surface of the third working portion pushing plate 301. Preferably, the third working portion push plate 301 is provided with a third working portion push plate forming protrusion 302 matched with the shape of the bottom defect of the crank throw rough product 700. The bottom of the third working portion push plate forming protrusion 302 is flush with the working plate 001, and the width of the third working portion push plate forming protrusion is consistent with that of the working plate 001.
In this embodiment, as shown in fig. 7 to 8, the fourth working part 400 and the third working part 300 have the same structure. The front surface of the fourth working part pushing plate 401 faces the working plate 001, the fourth working part 400 further comprises a fourth working part base 403 arranged on the back surface of the fourth working part pushing plate 401, a fourth working part hydraulic device 404 fixed on the fourth working part base 403, and a telescopic fourth working part hydraulic push rod 405 arranged on the fourth working part hydraulic device 404, and the fourth working part hydraulic push rod 405 drives the fourth working part pushing plate 401 to move by acting on the back surface of the fourth working part pushing plate 401. Preferably, the fourth working part pushing plate 401 is provided with a fourth working part pushing plate forming protrusion 402 matched with the shape of the bottom defect of the crank throw 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 of the fourth working part push plate forming protrusion is consistent with that of the working plate 001.
In the present embodiment, as shown in fig. 3 to 4 and fig. 9, the bottom of the upper press plate 501 is in a semicircular shape adapted to the shape of the upper portion of the crank throw rough product 700; in a natural state, the top of the partition pressing plate 502 protrudes out of the top of the upper pressing plate 501, and the bottom 503 of the partition pressing plate is flush with the bottom of the upper pressing plate 501 and is matched in shape. In this embodiment, it is preferable that the two will not move with each other due to the friction in the natural state, i.e. the separation pressing plate 502 will not fall off, and the separation pressing plate 502 will move relatively when it is forced downward, and the natural state of the separation pressing plate 502 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, and 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, wherein the first hydraulic lifting rod 504 and the second hydraulic lifting rod 505 jointly act on the upper pressing plate 501 to drive the upper pressing plate 501 to move up and down.
The crank extrusion forming method based on the crank extrusion forming device and easy to demould comprises the following steps:
s1: keeping the extrusion cavity open;
s2: placing the high-temperature crank throw blank 600 to be extruded on the working plate 001 through external hoisting equipment;
s3: the upper press plate 501 and the separation press plate 502 descend and press 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 in opposite directions 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 the 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, and the 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 600 stops moving after reaching a preset extrusion position, then the separating pressing plate 502 is driven by an external press to independently move downwards to be inserted into the high-temperature crank throw blank 600 for extrusion, and the high-temperature crank throw blank 600 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 towards each other until they contact the dividing platen 502, and stop moving, and extrude two holes in the high-temperature bell crank 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 pushing plate 201, the third working part pushing plate 301 and the fourth working part pushing plate 401, raising the upper pressing plate 501 and the separating pressing plate 502, and completing demoulding of the crank throw rough product 700;
s10: the throw preforms 700 are transported away from the throw extrusion apparatus by external handling equipment.
In the process of steps S1 to S7, the end of the first hole-forming extrusion rod 106 and one surface of the fixed thick plate 101 facing the high-temperature crank throw blank 600 are kept to form a complete plane; in the processes of steps S5 to S7, the end of the second hole-forming extrusion rod 207 and the surface of the second working portion pushing plate 201 facing the high-temperature bell crank blank 600 are kept to form a complete plane.
More specifically:
first, the second working part 200, the third working part 300, and the fourth working part 400 all retract the hydraulic push rod to the limit state, and drive the second working part push plate 201, the second hole-forming extrusion rod 207, the third working part push plate 301, and the fourth working part push plate 401 to all retract to the limit state, thereby leaving the middle area. In the fifth working unit 500, the upper platen 501 and the partition platen 502 are raised to the upper limit position by the first hydraulic lift lever 504 and the second hydraulic lift lever 505.
Subsequently, the high-temperature crank throw blank 600 (shown in fig. 10) heated to the preset temperature is placed on the working plate 001 through external hoisting equipment, then the first hole forming extrusion rod 106 extends outwards under the action of the first hole forming hydraulic device 104 and the first hole forming hydraulic push rod 105 until the end surface is flush with the surface of one side, close to the high-temperature crank throw blank, of the fixed thick plate 101, the movement is stopped, the whole surface of the fixed thick plate 101 forms a complete plane effect, and the hollow hole is blocked by the first hole forming extrusion rod 106. Then the first hydraulic lift lever 504 and the second hydraulic lift lever 505 move downward, so that the upper press plate 501 and the partition press plate 502 are pressed against the upper end of the high temperature bell crank blank 600, preventing them from moving up and down in the subsequent pressing 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 outwards, so as to drive the third working part push plate 301 and the fourth working part push plate 401 to move towards each other, and when the third working part push plate forming bulge 302 and the fourth working part push plate forming bulge 402 contact with the high-temperature blank, 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 outwards, so as to drive the second working part push plate 201 to move forwards, meanwhile, the extrusion rod 207 moves forwards synchronously with the push plate 201 under the action of the hydraulic device 205 and the hydraulic push rod 206, and keeps the end surface level with one side of the push plate 201 close to the high-temperature blank, so that the whole surface forms a complete plane effect, and the hole is blocked by the second hole-forming extrusion rod 207. And moving to contact with the high-temperature crank throw blank 600, extruding, and stopping extruding when the second working part push plate 201 contacts with the side wall of the working plate 001, so as to keep the position unchanged. The third working part push plate 301 and the fourth working part push plate 401 start to extrude until the third working part push plate forming protrusion 302 and the fourth working part push plate forming protrusion 402 are completely inserted between the high-temperature crank throw blank 600 and the working plate 001, and when the third working part push plate 301 and the fourth working part push plate 401 are both contacted with the side wall of the working plate 001, the extrusion is stopped, and the positions are kept unchanged. The upper press plate 501 and the partition press plate 502 start to move downward under the action of the external press, and press the high temperature crank throw blank 600 in the vertical direction, so that the head of the high temperature crank throw blank 600 becomes semicircular, and when reaching a predetermined pressing position, the movement is stopped. The dividing platen 502 is then moved downward independently by the external press so that the dividing platen bottom 503 is inserted into the middle of the high temperature bell crank blank 600 and pressed downward continuously, and stops moving when the predetermined pressing position is reached. The first and second apertured extrusion stems 106 and 207 then begin to move further toward each other, extruding the high temperature bell crank blank 600, and extruding two apertures therein, until the first and second apertured extrusion stems 106 and 207 contact the divider platen 502 (or are already in close proximity to 502, and cannot continue to compress), and the motion is stopped. At this point the throw preforms 700 have been extruded and cooled and begin to exit the various work sections. Firstly, the separation pressing plate 502 moves upwards to leave the crank rough product 700, and the upper pressing plate 501, the first hole-forming extrusion rod 106 and the second hole-forming extrusion rod 207 limit the crank, so that the movement of the crank cannot be caused in the process of withdrawing the separation pressing plate 502. The first and second apertured press bars 106,207 are then retracted and withdrawn. The second working portion push plate 201 is then withdrawn, the third working portion push plate 301 and the fourth working portion push plate 401 are withdrawn, and finally the upper press plate 501 and the partition press plate 502 move upward, away from the bell crank surface. The extruded crank throw preform 700 has now been completely separated from the apparatus and the effect of the crank throw preform 700 is shown in figure 11. And subsequently, the crank throw rough product 700 is transported away by an external hoisting device, and further finish machining is carried out, so that the final crank throw product can be obtained.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure 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.
CN201910942546.1A 2019-09-30 2019-09-30 Crank extrusion forming device easy to demould and crank extrusion forming method Active CN110695110B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928707A1 (en) * 1978-07-18 1980-02-07 Nissan Motor METHOD FOR PRODUCING COMPONENTS WITH TWO OR SEVERAL FORK ELEMENTS AND DEVICE FOR IMPLEMENTING THE SAME
CN2427399Y (en) * 2000-05-12 2001-04-25 哈尔滨工业大学 Internal pressing formation machine
CN103100570A (en) * 2011-11-14 2013-05-15 上海重型机器厂有限公司 Openable crank extrusion device and forming method of large marine crankshaft crank
CN103567246A (en) * 2012-08-07 2014-02-12 上海重型机器厂有限公司 Extrusion forming device and method for crank shaft and crank throw for large-size ship
CN207204878U (en) * 2017-08-02 2018-04-10 青岛恒利包装有限公司 Charging aperture locking device metal die is used in one kind processing
CN208341390U (en) * 2018-07-03 2019-01-08 绵阳勤桦科技有限公司 A kind of molding structure mold

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928707A1 (en) * 1978-07-18 1980-02-07 Nissan Motor METHOD FOR PRODUCING COMPONENTS WITH TWO OR SEVERAL FORK ELEMENTS AND DEVICE FOR IMPLEMENTING THE SAME
CN2427399Y (en) * 2000-05-12 2001-04-25 哈尔滨工业大学 Internal pressing formation machine
CN103100570A (en) * 2011-11-14 2013-05-15 上海重型机器厂有限公司 Openable crank extrusion device and forming method of large marine crankshaft crank
CN103567246A (en) * 2012-08-07 2014-02-12 上海重型机器厂有限公司 Extrusion forming device and method for crank shaft and crank throw for large-size ship
CN207204878U (en) * 2017-08-02 2018-04-10 青岛恒利包装有限公司 Charging aperture locking device metal die is used in one kind processing
CN208341390U (en) * 2018-07-03 2019-01-08 绵阳勤桦科技有限公司 A kind of molding structure mold

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