CN114309429A - Crank forming and forging process - Google Patents
Crank forming and forging process Download PDFInfo
- Publication number
- CN114309429A CN114309429A CN202210066077.3A CN202210066077A CN114309429A CN 114309429 A CN114309429 A CN 114309429A CN 202210066077 A CN202210066077 A CN 202210066077A CN 114309429 A CN114309429 A CN 114309429A
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- forging
- die
- anvil
- boss
- piece
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- 238000005242 forging Methods 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 24
- 238000005452 bending Methods 0.000 claims abstract description 22
- 238000007514 turning Methods 0.000 claims abstract description 10
- 210000003739 neck Anatomy 0.000 claims description 46
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 239000011265 semifinished product Substances 0.000 claims description 2
- 230000007306 turnover Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000001125 extrusion Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The invention relates to a crank forming forging process, which comprises the following steps: the method comprises the following steps: the forging machine comprises a forging machine, a manipulator, a replacing anvil die, a back buckling bending die, a core die, an upper anvil, a lower anvil, a workbench and a forging piece. Firstly, thinning and stretching a prefabricated forging piece with a boss in the middle, then arranging a male die, a trapezoidal die and a female die below the boss, arranging a concave anvil replacing die and an arc anvil replacing die above the boss, forging the boss in a multi-angle, left-right and turning manner, completing forging a bent neck cylindrical blank, then reversely forging and bending by using a back-buckling bending die, bending and folding two wings of the prefabricated forging piece, pressing by using a series of core dies with different thickness differences at two ends, forging the head of the boss into a quadrangular crank head, and finally finishing the crank forging piece to a set size. The design has the purposes of good forming degree, small machining allowance, short forging time, small material loss and low production cost.
Description
Technical Field
The invention relates to a crank throw forging, in particular to a crank throw forming and forging process, and belongs to the technical field of forging.
Background
The crank throw is an important part on the crankshaft, and because the crankshaft bears the conversion of mechanical rotation motion and reciprocating motion, the crank throw of a large-scale crankshaft is stressed greatly and is complex, so that the crank throw has enough rigidity, strength and impact load bearing capacity, in order to meet the performance requirements, a forged crank throw is usually selected, and the most important working procedure in the process of forging the crank throw is to meet the forging ratio and reduce the forging number of times. The existing forging method has the following disadvantages: firstly, because forging operation process is complicated, need many times of heating just can the shaping, secondly because the forging is many times of heating, can not satisfy and forge than, cause the thick quality of forging internal texture crystalline grain not to pass, thirdly forges with high costs, consequently is necessary to traditional forging technology optimization improvement.
Disclosure of Invention
The invention provides a crank forming forging process, which sets the shape and parameters of a process forging piece, completes forming, bending, pressing and finish forging at one heat, and achieves the purposes of reducing the heat and increasing the forging ratio.
The design scheme is as follows: a bell crank forming forging process, comprising: the forging machine comprises a forging machine, a manipulator, a plurality of anvil replacing dies, a back buckling bending die, a core die, an upper anvil, a lower anvil, a workbench and a forging piece, wherein the anvil replacing dies comprise a concave anvil replacing die and an arc anvil replacing die, the core die is multiple, the thickness difference of two ends of different core dies is different, the lower anvil comprises a small flat anvil, a convex die, a trapezoidal die, a concave die and a large flat anvil, and the manipulator comprises a manipulator 1 and a manipulator 2; the upper anvil is fixedly connected to the forging machine, the male die and the large flat anvil form a fixed chain, and the fixed chain is turned over and replaced; little flat stock, terrace die, trapezoidal mould, concave mould and big flat stock setting are in on the workstation, along with the workstation removal, the forging is the two wings that the middle part has the boss, its characterized in that:
comprises the following steps
One, forged curved neck
second, bend
thirdly, pressing
fourth, the pulling head
fifthly, finishing
And 12, placing the forged piece in the step 11 on a large flat anvil or a small flat anvil, and finishing the crank forged piece to a set size.
Further, the male die is a trapezoidal die or an arc-shaped die.
Preferably, the concave surface of the concave anvil replacing die is meshed with the convex surface of the forging.
The present invention adopts various anvil dies of different shapes, and the forging and pressing are changed by moving left and right, turning back and forth and changing angle, and the forging and pressing are repeatedly changed for different anvil dies, so that the curved neck is gradually formed. The reverse buckling bending die is arranged between the forging piece and the upper anvil, the anvil die is replaced quickly, the arc-shaped extrusion surface of the bending die is utilized, rolling extrusion is formed between the forging piece double-wing body bending process and the die, the crank forging piece is continuously bent by small extrusion force and short extrusion stroke, the large crank forging piece bending process is completed by a forging machine with small pressure, and forging forming is completed by one fire. The invention has the characteristics of good forging forming degree, small machining allowance, short forging time, small material loss and low production cost.
Drawings
Figure 1 is a schematic drawing of the forging process of step 2,
figure 2 is a front view of step 3 in an initial forging state,
figure 3 is a left side view of figure 2,
figure 4 is a left side view of the workpiece of figure 2, turned 180,
figure 5 is a schematic view of the process step 4 in an initial forging state,
FIG. 6 is a schematic view showing the forging state at the end of step 4,
FIG. 7 is a schematic view of the forging process in step 5 in one position,
figure 8 is a schematic view of step 5 in another orientation of the forging process,
figure 9 is a schematic view of the forging state of step 6,
FIGS. 10 and 11 are schematic views of the forging state of the anvil and the punch in step 7,
FIG. 12 is a schematic view showing the forging state of a concave anvil-replacing die and a concave die in step 7,
figure 13 is a schematic view of the initial forging state of step 8,
figure 14 is a schematic view of the forging state at the end of step 8,
figure 15 is a schematic view of the process step 9 in the initial forging state,
figure 16 is a schematic view of the forging state at the end of step 9,
figure 17 is a schematic drawing of the forging stage 10,
figure 18 is a schematic view of the forged crank throw head of step 11,
FIG. 19 is a schematic view showing the forged crank head of the forged part of FIG. 18 rotated by 90 degrees,
FIGS. 20 and 21 are schematic views of the finish forged crank in the state of step 12 with the core mold,
fig. 22 and 23 are schematic views of the process step 12 with the core die finish forged crank removed.
In the attached drawing, 1 is an upper anvil, 2 is a large flat anvil, 3 is a forge piece, 4 is a manipulator 1, 4 'is a manipulator 2, 5 is a convex die, 6 is a trapezoidal die, 7 is a concave anvil-replacing die, 8 is a concave die, 9 is an arc anvil-replacing die, 10 is a back-buckling bending die, 11 is a core die with a large thickness difference, 11' is a core die with a gradually reduced thickness difference, and 12 is a small flat anvil.
Detailed Description
The invention will be further explained with reference to the drawings,
as shown in the attached figure 1, the heated forging 3 is placed on a large flat anvil 2, an upper anvil 1 is pressed downwards, and the double fins are pressed, thinned and drawn to a set size.
As shown in the attached figures 2, 3 and 4, the mechanical arm 4 clamps the forge piece 3, the middle part of the forge piece 3 is arranged above the convex die 5, the forge piece 3 is turned by 180 degrees and forged, the forge piece 3 is moved left and right and forged, the position of the forge piece 3 is changed for many times, and two side faces of the curved neck are forged preliminarily.
As shown in the attached figures 5 and 6, a boss of a forged piece 3 is upwards arranged on a trapezoidal die 6, a concave anvil replacing die 7 clamped by a manipulator 4' is sleeved on the forged piece 3, an upper anvil 1 is pressed downwards, and the bottom surfaces of double wings opposite to the boss are preliminarily forged to form the lower surface of a bent neck.
As shown in the attached figures 7 and 8, two side surfaces and the lower surface of the curved neck are arranged on the male die 5, and the two side surfaces, the lower surface and the connecting part of the curved neck are alternatively forged by turning back and forth and moving left and right to be forged to be approximate to the curved neck shape.
As shown in figure 9, the bent neck forged by figures 2, 3, 4, 5, 6, 7 and 8 is placed on a female die 8, the forged piece 3 is turned back and forth, the forging and pressing angle is changed, the upper anvil 1 presses the boss head part downwards, the boss head part is forged and pressed on the polygonal bent neck, and the two side faces and the lower face of the bent neck are forged and pressed into semi-cylinders.
As shown in fig. 10 and 11, the male die 5 is used to forge the bending neck from multiple angles with the upper anvil 1.
As shown in fig. 12, the curved neck is forged in the circumferential direction by using an arc instead of the anvil 9 and the die 8, and the curved neck is forged into a cylindrical shape, thereby completing the forging of the curved neck cylindrical blank.
As shown in attached figures 13 and 14, the lower part of the bending neck is arranged on a female die 8, a manipulator 4' clamps a left-hand buckling bending die 10 to be buckled on the two wings of the double-wing body in a left-hand mode, an upper anvil 1 is pressed downwards, and a forge piece 3 is bent into a herringbone shape;
as shown in the attached figures 15 and 16, the inverted V-shaped forge piece 3 is placed on a large flat anvil 2, a core die 11 with the largest thickness difference at two ends is inserted into an opening of the forge piece 3 by a manipulator 4', the forge piece 3 is forged, two sides of the forge piece 3 are close to each other, the forge piece 3 is turned upside down and then forged, and two sides of the forge piece 3 are close to the core die 11.
As shown in fig. 17, the core dies 11 'with the thickness difference gradually reduced at the two ends are sequentially replaced, the forging 3 is forged, the two fins of the double-fin body on the forging 3 are attached to the core dies 11', the forging 3 is turned over and then forged, the outer sides of the double-fin body are precisely forged, and the two parallel cranks are forged.
As shown in fig. 18, the core mold 11' and the forging 3 are turned over synchronously in a pressing state, and the upper end of the bending neck is forged; and (3) turning the forged piece 3 in the state of the attached drawing 18 by 90 degrees until the forged piece is shown in the attached drawing 19, continuously forging the upper end of the crank neck, and drawing the upper end of the crank neck into a frustum pyramid-shaped crank head.
The forging 3 is placed on a small flat anvil 12 as shown in fig. 20, the crank is finished, the forging with the mandrel 4' is turned over 90 ° as shown in fig. 21, and the side of the crank is finished.
And (3) placing the forged piece 3 on a small flat anvil 12 as shown in the attached drawing 22, finishing the crank, turning the forged piece 90 degrees as shown in the attached drawing 23, finishing the side surface of the crank, and finishing the crank forging.
Claims (3)
1. A bell crank forming forging process, comprising: the forging machine comprises a forging machine, a manipulator, a plurality of anvil replacing dies, a back buckling bending die, a core die, an upper anvil, a lower anvil, a workbench and a forging piece, wherein the anvil replacing dies comprise a concave anvil replacing die and an arc anvil replacing die, the core die is multiple, the thickness difference of two ends of different core dies is different, the lower anvil comprises a small flat anvil, a convex die, a trapezoidal die, a concave die and a large flat anvil, and the manipulator comprises a manipulator 1 and a manipulator 2; the upper anvil is fixedly connected to the forging machine, the male die and the large flat anvil form a fixed chain, and the fixed chain is turned over and replaced; little flat stock, terrace die, trapezoidal mould, concave mould and big flat stock setting are in on the workstation, along with the workstation removal, the forging is the two wings that the middle part has the boss, its characterized in that:
comprises the following steps
One, forged curved neck
Step one, heating the semi-finished product forge piece to a forging temperature;
secondly, placing the heated forge piece on a large flat anvil, and pressing and drawing the long double fins to a set size;
thirdly, clamping the forge piece by the manipulator 1, placing the middle part of the forge piece above the male die, performing turnover forging at 180 degrees, performing left-right moving forging, performing position forging for multiple times, and performing primary forging to obtain two side faces of the bent neck;
step four, the boss of the forge piece in the step two is upwards arranged on the trapezoidal die, the concave anvil replacing die is clamped by the manipulator 2 and sleeved on the forge piece, and the bottom surface of the double-wing body opposite to the boss is preliminarily forged to form the lower surface of the bent neck;
fifthly, placing the two side surfaces and the lower surfaces of the bent necks in the second step and the third step on a male die, alternately forging the two side surfaces, the lower surfaces and the connecting parts of the bent necks by turning back and forth and moving left and right, and forging the bent necks to be close to the shape of the bent necks;
sixthly, placing the bent neck of the forged piece in the fourth step on a female die, turning back and forth to change the forging and pressing angle, pressing the head part of the boss under the upper anvil, forging and pressing the head part of the boss to be the upper surface of the polygonal bent neck, and forging and pressing the two side surfaces and the lower surface of the bent neck to be semi-cylinders by the female die;
step seven, alternately placing the bent necks forged in the step six on a male die and a female die, respectively adopting a small flat anvil and an arc-shaped anvil replacing die for an upper anvil, forging the bent necks at multiple angles, and forging the bent necks into cylindrical bent neck blanks;
second, bend
Eighthly, placing the bent neck on a female die, clamping a left-hand buckling bending die by a manipulator 2, reversely buckling the left-hand buckling bending die on the two wings of the double-wing body, pressing an upper anvil downwards, and bending the two wings into a herringbone shape;
thirdly, pressing
Putting the herringbone forge piece on a large flat anvil, inserting a core mold with the largest thickness difference at two ends into an opening of the forge piece by a manipulator 2, pressing the upper anvil downwards, enabling two wings to approach, overturning the forge piece and forging, and enabling the two wings to approach the core mold;
step ten, sequentially replacing the core moulds with the thickness difference gradually reduced at the two ends, repeating the step eight, further attaching the two wings to the core moulds, turning the forge piece, precisely forging the outer sides of the double-wing bodies, and forging the two cranks;
fourth, the pulling head
Step eleven, synchronously overturning the core mold and the forging piece in a pressing state, placing the core mold and the forging piece on a large flat anvil, forging the head of a boss, and drawing the head of a quadrangular frustum pyramid crank;
fifthly, finishing
And a twelfth step of placing the forging of the eleventh step on a large flat anvil or a small flat anvil and finishing the crank forging to a set size.
2. The bell crank forming forging process according to claim 1, wherein: the male die is a trapezoidal die or an arc die.
3. The bell crank forming forging process according to claim 1, wherein: and the concave surface of the concave anvil replacing die is meshed with the convex surface of the forging.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210066077.3A CN114309429B (en) | 2022-01-20 | 2022-01-20 | Crank forming forging process |
| PCT/CN2022/109747 WO2023138030A1 (en) | 2022-01-20 | 2022-08-02 | Two-fire forming forging process for large crank throw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210066077.3A CN114309429B (en) | 2022-01-20 | 2022-01-20 | Crank forming forging process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114309429A true CN114309429A (en) | 2022-04-12 |
| CN114309429B CN114309429B (en) | 2024-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210066077.3A Active CN114309429B (en) | 2022-01-20 | 2022-01-20 | Crank forming forging process |
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| Country | Link |
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| CN (1) | CN114309429B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023138030A1 (en) * | 2022-01-20 | 2023-07-27 | 中聚信海洋工程装备有限公司 | Two-fire forming forging process for large crank throw |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020072859A (en) * | 2001-03-13 | 2002-09-19 | 현대중공업 주식회사 | Forging method and dies of crank throw using the unbended preform |
| KR20120069129A (en) * | 2010-12-20 | 2012-06-28 | 현대중공업 주식회사 | Manufacturing device and method thereof for crank throw |
| CN106623740A (en) * | 2016-06-17 | 2017-05-10 | 湖北三环车桥有限公司 | Method for manufacturing automobile front shaft through upsetting and correcting technology |
| CN113926973A (en) * | 2021-10-28 | 2022-01-14 | 中聚信海洋工程装备有限公司 | Combined anvil die and process for forging large crank throw |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2761124B2 (en) * | 1991-06-25 | 1998-06-04 | 日産自動車株式会社 | Crankshaft forging equipment |
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2022
- 2022-01-20 CN CN202210066077.3A patent/CN114309429B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020072859A (en) * | 2001-03-13 | 2002-09-19 | 현대중공업 주식회사 | Forging method and dies of crank throw using the unbended preform |
| KR20120069129A (en) * | 2010-12-20 | 2012-06-28 | 현대중공업 주식회사 | Manufacturing device and method thereof for crank throw |
| CN106623740A (en) * | 2016-06-17 | 2017-05-10 | 湖北三环车桥有限公司 | Method for manufacturing automobile front shaft through upsetting and correcting technology |
| CN113926973A (en) * | 2021-10-28 | 2022-01-14 | 中聚信海洋工程装备有限公司 | Combined anvil die and process for forging large crank throw |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023138030A1 (en) * | 2022-01-20 | 2023-07-27 | 中聚信海洋工程装备有限公司 | Two-fire forming forging process for large crank throw |
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| Publication number | Publication date |
|---|---|
| CN114309429B (en) | 2024-03-19 |
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