CN109433984B - All-fiber profiling forging forming method for multi-claw component - Google Patents
All-fiber profiling forging forming method for multi-claw component Download PDFInfo
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- CN109433984B CN109433984B CN201811653168.7A CN201811653168A CN109433984B CN 109433984 B CN109433984 B CN 109433984B CN 201811653168 A CN201811653168 A CN 201811653168A CN 109433984 B CN109433984 B CN 109433984B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
Abstract
The invention discloses an all-fiber profiling forging forming method for a multi-claw member, belongs to the technical field of forging, and solves the problems that a large multi-claw member in the prior art is poor in overall performance, easy to crack at a claw root, poor in surface quality and the like. The method comprises the following steps: s1, drawing a hook forging drawing; s2, heating and upsetting the blank; s3, performing split forging; s4, drawing and forging; s5, leveling and upsetting are carried out; s6, placing the formed ring body on the blank, centering, and pressing the formed ring body downwards; s7, lifting the pressed forming ring body and the blank together into a lower die, and pressing the forming ring body again to obtain a U-shaped bend and a middle cone; s8, placing a punch at the upper end of the middle cone and centering, and performing punching operation to obtain the lifting hook forging. The method is suitable for preparing large-scale multi-claw components with the weight of 3000 tons or more.
Description
Technical Field
The invention belongs to the technical field of forging, and particularly relates to an all-fiber profiling forging forming method for a multi-claw component.
Background
The hoisting hook for the large-scale crane ship is mostly cast, and cracks often appear at the stress concentration part of the U-shaped part of the hoisting hook claw in the using process of the hoisting hook, so that the hoisting hook is repeatedly repaired, and the heavy loss is caused to the large-scale crane ship. The university of the great maritime affairs also cooperates with Hua-heavy industry and Shanghai heavy machinery plants to develop a large forging lifting hook, but the research fails due to insufficient technical capability, backward technical scheme and the like.
The lifting hook diameter of 3000 tons and above reaches more than 4 meters, and the structure is complicated, and the required mould cost of adopting traditional forging mode is too high, and the required pressure of press is too high, and qualified lifting hook forging can not be forged out to traditional forging mode. Enterprises related to manufacturing of large marine lifting hooks in China mainly include Shanghai heavy machinery plants and Shanghua heavy industry, but the two enterprises adopt a method of lifting out a hook claw by a gas cutting cake-shaped forging piece in the process of manufacturing an integrally forged lifting hook with the weight of 3000 tons or more, the deformation is small, the cast state residue is high, the integral performance of the lifting hook is poor, the root part of the claw is easy to crack, the surface quality is poor, and the problems are frequent, so that design departments or users also seek heavy equipment manufacturing enterprises capable of integrally forging high-quality large marine lifting hooks.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide an all-fiber profiling forging method for multi-jaw members, which is used to solve the problems of poor overall performance, easy cracking of jaw root, poor surface quality, etc. of multi-jaw members of 3000 tons or more in the prior art.
The purpose of the invention is mainly realized by the following technical scheme:
a full-fiber profile forging forming method of a multi-claw component comprises the following steps:
s1, drawing a hook forging drawing;
s2, heating and upsetting the blank;
s3, performing split forging;
s4, drawing and forging;
s5, leveling and upsetting are carried out;
s6, placing the formed ring body on the blank, centering, and pressing the formed ring body downwards;
s7, lifting the pressed forming ring body and the blank together into a lower die, and pressing the forming ring body again to obtain a U-shaped bend and a middle cone;
s8, placing a punch at the upper end of the middle cone and centering, and performing punching operation to enable the middle cone to be a hollow cone to obtain the hook forging.
Further, in step S3, an upper hammer head and a lower hammer head are used for split forging;
the upper hammer head is a V-shaped anvil, and the V-shaped included angle is 90 degrees; the V-shaped anvil extrusion section end is an arc shape which is bent inwards, the length of the upper hammer head is matched with that of the cylindrical blank, and the upper hammer head and the lower hammer head are identical in shape.
Furthermore, α is more than or equal to β, α is the included angle between the inner inclined wall of the forming ring body and the vertical direction, and the included angle between the generatrix of β hollow cone and the central line;
the minimum inner diameter of the forming ring body is equal to the outer diameter of the upper end surface of the hollow cone, the maximum outer diameter of the forming ring body is equal to the length of the inner contour of the hook tip of the hook claw, and the height of the forming ring body is the difference between the height of the hook tip of the hook claw from the bottom of the hollow cone and the height of the U-shaped bent bottom plane of the hook claw from the bottom of the hollow cone;
θ＝arctan((D0/2-(H2-H1)tanβ-D3/2)/R2)
γ＝arctan(R1/(D4/2-D0/2)
in the formula, theta is the included angle between the bottom inclined wall and the horizontal plane, gamma is the included angle between the outer inclined wall and the vertical line, D0 is the distance between the centers of the transition fillets R2 at the junction of the U-shaped bend and the cone of two hooks which mutually form 180 degrees, H2 is the height of the hollow cone, R1 is the radius of the first transition fillet of the U-shaped bend of the hook, and R2 is the radius of the second transition fillet of the U-shaped bend of the hook.
Further, step S2, heating the blank to 1230-1270 ℃, and upsetting to H6;
H6＝(1.1～1.2)H3
wherein H3 is the height of the hook tip from the bottom of the hollow cone.
Further, the step S3 specifically includes: placing a blank on a lower hammer head, wherein the central lines of the upper hammer head and the lower hammer head in the length direction and the axial central line of the blank are in the same plane, and pressing down the upper hammer head to perform forging operation; and after the first-time pressing is finished, lifting the upper hammer head, turning the blank by 90 degrees, performing second-time pressing, and sequentially performing pressing, hammer lifting and blank turning by 90 degrees until the distance between the upper hammer head and the lower hammer head reaches a set value.
Further, step S4 is: and (3) uniformly drawing the root of each petal of the forged blank by using an upper flat anvil and a lower flat anvil, pressing each petal of the full anvil along the hammer until the thickness of each petal reaches a set value, and finishing drawing forging.
Furthermore, the blank is provided with a blank jaw for clamping the blank during split forging and drawing forging.
Further, step S4 further includes: and gas cutting the aligned blank root to remove the blank jaw.
Further, the blank is cylindrical blank, and cylindrical blank satisfies:
6.162DL×LL＝1.75V0
DL/LL≤2.5
in the formula, DLIs the diameter of a cylindrical blank, LLIs the length of the cylindrical blank.
Furthermore, the punch is in a frustum shape and used for forming a center hole of the lifting hook forging; the diameter of the lower end face of the punch is equal to the inner diameter of the center hole of the lifting hook forging.
Compared with the prior art, the invention can at least realize one of the following technical effects:
1) in the technical scheme, the prefabricated forging stock (namely the cross forging stock after S3 split forging) has the advantages of simple die structure, simple and easy operation process and stable forming quality, greatly improves the qualification rate of finished products, shortens the manufacturing period and reduces the manufacturing cost of forgings.
2) The method has the advantages of no flame cutting, large forced deformation degree, good forging penetration, complete flow line of the hook forging, capability of improving the mechanical and physical and chemical properties of the forging, improvement of the lifting capacity and the safe reliability of the hook member, great reduction of the shore-approaching inspection time of the large crane ship, and improvement of the commercial operation efficiency and the economic benefit of the large crane ship.
3) The cutting processing amount is greatly reduced, the metal material is saved, and the cost is reduced; the forging die can be directly applied to the research and development and the manufacture of other similar multi-claw or multi-joint forging pieces.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a cross-sectional view of a hook forging of the present invention;
FIG. 2 is a schematic view of the hollow cone shape of the hook forging of the present invention;
FIG. 3 is a top view of the hook forging of the present invention;
FIG. 4 is a schematic view of the punch structure of the present invention;
FIG. 5 is a cross-sectional view of the formed ring body of the present invention;
FIG. 6 is a front view of the structure of the upper (lower) hammer head of the present invention;
FIG. 7 is a left side view of the upper (lower) hammer head of the present invention;
FIG. 8 is a schematic view of the structure of the lower mold of the present invention;
FIG. 9 is a front view of the blank after the split forging of the present invention;
FIG. 10 is a left side view of the blank after the split forging of the present invention;
FIG. 11 is a schematic side view of the present invention.
Reference numerals:
1-an outer vertical wall; 2-outer inclined wall, 3-bottom inclined wall; 4-inner inclined wall; 5-an inner vertical wall; 6-lifting holes; 7-blank jaw;
d0-the distance between the circle centers of the transition fillets R2 at the junction of the U-shaped bend of the two hooks and the cone which mutually form 180 degrees; d1-inner diameter of central hole of hollow cone; d2-outer diameter of the lower end face of the hollow cone; d3-outer diameter of the upper end face of the hollow cone; d4-hook tip inner profile length; d5-length of the outer contour of the hook tip of the hook; d6, D7-hook claw outer diameter; d8-diameter of the lower end face of the punch; d9-diameter of the upper end face of the punch; d10-minimum inside diameter of the forming ring; d11-maximum outside diameter of the forming ring;
r1-hook claw U-shaped bend first transition fillet radius; r2-hook claw U-shaped bend second transition fillet radius; r3-radius of the outer contour of the root of the claw; r4-radius of arc of lower die; r5-arc radius of upper hammer head;
h1-the height of the U-shaped bent bottom plane of the hook claw of the hook from the bottom of the hollow cone; h2-hollow cone height; h3-height of hook tip from the bottom of hollow cone; h4-punch height; h5-formed ring body height; h6-height of the forging stock after upsetting of the bushing; h7-the distance between the upper hammer and the lower hammer when one split forging pass is finished; h8-the height of the forging stock after being placed on a large platform and being subjected to level upsetting; h9-the reduction of the ring body is formed after the forging stock is placed on a large platform; h10-the rolling reduction of the forming ring body after the forging stock and the forming ring body are lifted to the lower die together;
b1-the root of the hook claw of the hook forging is long; b2-the middle part of the claw of the hook forging is long; b3-the hook claw end of the hook forging is long; b4-the hook claw end of the hook forging is wide; b5-the middle part of the claw of the hook forging is wide; b6-the root of the claw of the hook forging is wide;
the units of the length, the radius and the like are all mm;
α -the included angle between the inner inclined wall 4 of the forming ring body and the vertical direction, β -the included angle between the generatrix of the hollow cone and the central line, theta-the included angle between the bottom inclined wall 3 and the horizontal plane, and gamma-the included angle between the outer inclined wall 2 and the vertical line.
Detailed Description
The method of forming the multi-jaw member by full-fiber profiling forging is described in further detail below with reference to specific examples, which are provided for purposes of comparison and explanation only and to which the present invention is not limited.
In one embodiment of the invention, the full-fiber profile forging forming method of the multi-claw component comprises the following steps:
s1, drawing a hook forging drawing;
the structure of the lifting hook forging is shown in figures 1-3, and according to the requirements of a processing drawing, the inner diameter D1 of a central hole of a hollow cone, the outer diameter D2 of a lower end face of the hollow cone and the outer diameter D3 of an upper end face of the hollow cone are determined, the upper end face is a small head end, the lower end face is a large head end, the height H2 of the hollow cone, an included angle β between a generatrix of the hollow cone and a central line, the length D4 of an inner contour of a hook tip of the lifting hook tip, the length D5 of an outer contour of the hook tip of the lifting hook tip, the outer diameter D6(D7) of the lifting hook claw, D6 and D7 are the maximum outer diameter of the outer contour of the lifting hook claw of the lifting hook forging, the radius R1 of a first transition fillet of the U-shaped hook claw, the radius R2 of a second transition fillet of the U-shaped hook claw, the outer contour R3 of a root of the lifting hook.
According to the special utensil of assisting of lifting hook forging structural design:
punching: the punch is in a frustum shape, as shown in fig. 4, the punch is mainly used for forming a center hole of a lifting hook forging, wherein the upper end face of the punch is a small end, the lower end face of the punch is a large end, the diameter D8 of the lower end face is equal to the inner diameter D1 of the center hole of the forging, the height H4 is H2/3, the upper end face of the punch is provided with a lifting hole 6, and the diameter of the upper end face is smaller than D8, so that the punch can be conveniently taken out.
The forming ring body is a ring-shaped piece as shown in figure 5, and comprises an outer vertical wall 1, an outer inclined wall 2, a bottom inclined wall 3, an inner inclined wall 4 and an inner vertical wall 5, wherein the forming ring body is mainly used for forming hook claws, hook claw U-shaped bends and an intermediate cone of a hook forging, the forming ring body is manufactured according to the outer diameter D3 of the upper end surface of the intermediate cone, the included angle β between a generatrix of the hollow cone and a central line, the length D4 of the inner contour of a hook claw hook tip, transition rounded corners R1 and R2 of the hook claw U-shaped bend, and the like, wherein the included angle α between the inner inclined wall 4 in the forming ring body and the vertical direction is larger than or equal to the included angle β between the generatrix of the hollow cone and the central line, the forming ring body is easy to demould, the minimum inner diameter D10 of the forming ring body is equal to the outer diameter D3 of the end surface of the hollow cone, the maximum outer diameter D11 of the hook claw hook tip is equal to the length D4, the total height H5 of the forming ring body is equal to the difference between the hook tip and the bottom of the hollow cone and the bottom plane of the hook claw U-shaped bend, namely the included angle H2H-2H 94H-8424/8624, and the forming ring body ((2) are equal to the forming ring body/(2/min # 94H 5) and the forming ring body.
Upper (lower) hammer head: as shown in fig. 6-7, the main function is for splitting of the blank (each piece ultimately corresponds to four hooks). Because four hook claws of the lifting hook are uniformly distributed at 90 degrees, the included angle of the upper (lower) hammer heads is set to be 90 degrees; the circular arc radius R5 is determined according to the outer diameters D2 and D3 of the lower end face and the upper end face of the hollow cone of the hook forging, the initial value of R5 is set as the average value of D2 and D3, then the three-dimensional model is optimized through numerical simulation, UG is used for establishing a three-dimensional model, the three-dimensional model is introduced into defem software, the editing temperature is 1250 +/-20 ℃, the lubrication state is realized, the friction coefficient is 0.3, the forming speed is 10mm/s, and the R5 data is adjusted for optimization; the length L1 of the upper hammer head is matched with the length of the cylindrical blank; the upper hammer head and the lower hammer head are same in shape.
Lower die: as shown in FIG. 8, the main function is to shape the outer contour of the root of the hook claw, and the parameter R4 is manufactured according to the fillet R3 of the outer contour of the root of the hook claw.
Calculating the blanking weight of the forge piece: and calculating the blanking weight according to the characteristic that the volume is unchanged before and after plastic deformation. The finish machining volume of the forge piece (namely the volume of the finished product of the hook forge piece) is V0, and then the volume V of the forge piece is KV 0;
the K-volume coefficient is calculated according to forging specification allowance and forging fire consumption of each fire, and the four-claw lifting hook K is 1.75.
Calculating the blanking size of the forge piece: forging blanking diameter DLAnd a blanking length LLThe requirements are satisfied:
6.162DL×LL＝1.75V0；
in addition, for avoiding blank unstability when jumping-up, the unloading size still needs to satisfy: dL/LL≤2.5。
S2, heating and upsetting the blank;
the blank adopts a cylindrical blank with a jaw, and before forging, an upsetting drain pan is placed on the working table of the hydraulic press. And (3) heating the blank to 1250 +/-20 ℃, and then hanging the blank into a drain pan to be upset to H6, wherein H6 is (1.1-1.2) H3.
S3, performing split forging;
the lower hammer is placed on the working table surface of the hydraulic press, the movable cross beam of the hydraulic press is hung on the upper hammer, and the die is centered. The manipulator clamps the blank jaw 7, and the blank is placed on the lower hammer, and the length direction of the upper hammer and the length direction of the lower hammer need to be kept on the same straight line with the axial direction of the blank. After all is ready, split forging is carried out.
The movable cross beam moves downwards to perform forging operation, after the first pressing is completed, the movable cross beam moves upwards to lift the upper hammer, the blank is turned over by 90 degrees, and the second pressing is performed. Then, the operation of pressing down, raising the hammer, inverting the billet (90 °), pressing down, and raising the hammer is performed in this order until the up-down hammer head pitch reaches the set value H7, and H7 becomes D3. The blank after the split forging is shown in fig. 9-10.
S4, drawing and forging;
before forging, an upper flat anvil is hung on an upper cross beam of the hydraulic press, and a lower flat anvil is placed on a workbench; the hydraulic press is provided with a space between the upper flat anvil and the lower flat anvil. The manipulator laterally clamps the forge piece or embraces the jaw 7 of the blank, the upper and lower flat anvils are flush with the root of each petal, each full anvil is pressed down along the hammer until the thickness of each petal reaches a set value, and the four-petal drawing forging of the blank is completed. The billet is split and laterally drawn out as shown in fig. 11.
DB1＝k1B1；DB2＝k2B2；
DB3＝k3B3；DB4＝k4B4；
DB5＝k5B5；DB6＝k6B6；
Wherein k1, k2, k3, k4, k5 and k6 are compensation coefficients, and can be obtained by numerical simulation: initially setting DB 1-DB 2-DB 3-200 mm, DB 4-700 mm, DB 5-900 mm and DB 6-1100 mm (initially setting reference figure size), performing numerical simulation by using Deform software, and adjusting k value to obtain corresponding optimized compensation coefficients k1, k2, k3, k4, k5 and k 6.
S5, leveling and upsetting are carried out;
and gas cutting the blank jaw 7 at the root of the blank. Before forging, a hydraulic press moves a working platform, a large platform, an upsetting cover plate and a lower die are placed on the working platform, and longitudinal and transverse midpoint marks are carried out on the large platform; the blank is placed on the large platform and centered, and the blank is ensured to be positioned in the middle of the large platform longitudinally and transversely as much as possible. The upsetting cover plate is placed on the upper end face of the blank, and the upsetting blank has the downward pressing amount of H8. The hot upsetting mainly plays a role in flattening the end face, so that H8 is 100-200 mm;
s6, removing the cover plate, placing the formed ring body on the blank and centering, and applying pressure on the formed ring body by a movable cross beam of a hydraulic press, wherein the pressing amount is H9, and H9 is H6-H8-H1;
s7, lifting the blank and the formed ring body together into a lower die, and pressing and forming the ring body by a hydraulic press, wherein the pressing amount is H10, and H10 is 100-200 mm; the main function of the step is that the forming ring body is used for upsetting the blank integrally, and the hook claw and the middle cone of the hook forging are formed in the upsetting process;
s8, placing a punch at the upper end of the blank and centering, and performing punching operation to obtain the lifting hook forge piece. The punch is hung on the blank through the lifting hole 6, and the height H4 of the punch of the special auxiliary tool for the lifting hook is smaller than the height H2 of the hollow cone, so that the special auxiliary tool punch needs to be matched with a plurality of universal hollow punches for use in the punching process.
And finally, hoisting the blank and the formed ring body to a large platform, placing a punch at the upper end of the blank (paying attention to die centering), finishing the punching operation, and finishing the whole process of the integral lifting hook forge piece with the middle hollow cone provided with the four hooks, namely the all-fiber copying forging.
The invention has the advantages due to the adoption of the technical scheme: 1. in the technical scheme, the precast forging stock and the die have simple structures, the operation process is simple and easy, and the forming quality is stable; 2. the cutting processing amount is greatly reduced, and metal materials are saved; 3. the forging penetration is good, the streamline of the hook forging is complete, and the performance grade (mechanical and physical and chemical properties) of the forging can be improved; 4. the manufacturing period is shortened; 5. the qualification rate of finished products is greatly improved, and the manufacturing cost of forgings is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A full-fiber profiling forging forming method of a multi-claw component is characterized by comprising the following steps:
s1, drawing a hook forging drawing;
s2, heating and upsetting the blank;
s3, performing split forging;
s4, drawing and forging;
s5, leveling and upsetting are carried out;
s6, placing the formed ring body on the blank, centering, and pressing the formed ring body downwards;
s7, lifting the pressed forming ring body and the blank together into a lower die, and pressing the forming ring body again to obtain a U-shaped bend and a middle cone;
s8, placing a punch at the upper end of the middle cone and centering, and performing punching operation to enable the middle cone to be a hollow cone to obtain the hook forging.
2. The all-fiber profile forging method for forming a multi-jaw member according to claim 1, wherein in step S3, split forging is performed using an upper hammer and a lower hammer;
the upper hammer head is a V-shaped anvil, and the V-shaped included angle is 90 degrees; the V-shaped anvil extrusion section end is an arc shape which is bent inwards, the length of the upper hammer head is matched with that of the cylindrical blank, and the upper hammer head is the same as the lower hammer head in shape.
3. The full-fiber profile forging forming method of the multi-claw member according to claim 1, wherein α is more than or equal to β, α is an included angle between an inclined wall (4) in a forming ring body and a vertical direction, and β is an included angle between a generatrix and a central line of a hollow cone;
the minimum inner diameter of the forming ring body is equal to the outer diameter of the upper end surface of the hollow cone, the maximum outer diameter of the forming ring body is equal to the length of the inner contour of the hook tip of the hook claw, and the height of the forming ring body is the difference between the height of the hook tip of the hook claw from the bottom of the hollow cone and the height of the U-shaped bent bottom plane of the hook claw from the bottom of the hollow cone;
θ＝arctan((D0/2-(H2-H1)tanβ-D3/2)/R2)
γ＝arctan(R1/(D4/2-D0/2)
in the formula, theta is an included angle between the bottom inclined wall (3) and the horizontal plane, gamma is an included angle between the outer inclined wall (2) and the vertical line, D0 is a distance between centers of transition fillets R2 at the junction of a U-shaped bend of two hooks which mutually form 180 degrees and a cone, H2 is the height of the hollow cone, R1 is the radius of a first transition fillet of the U-shaped bend of the hooks, R2 is the radius of a second transition fillet of the U-shaped bend of the hooks, and D3 is the outer diameter of the upper end face of the hollow cone; d4 is the length of the inner contour of the hook tip of the hook, H1 is the height of the U-shaped bending bottom plane of the hook claw of the hook from the bottom of the hollow cone.
4. The full-fiber profile forging forming method of the multi-jaw member according to claim 1, wherein the step S2 is to heat the billet to 1230-1270 ℃ and upset to H6;
H6＝(1.1～1.2)H3
wherein H3 is the height of the hook tip from the bottom of the hollow cone.
5. The all-fiber profiling forging forming method of a multi-jaw member according to claim 2, wherein the step S3 includes the following steps: placing a blank on the lower hammer head, wherein the central lines of the upper hammer head and the lower hammer head in the length direction and the axial central line of the blank are in the same plane, and the upper hammer head presses downwards to perform forging operation; and after the first-time pressing is finished, lifting the upper hammer head, turning the blank by 90 degrees, performing second-time pressing, and sequentially performing pressing, hammer lifting and blank turning by 90 degrees until the distance between the upper hammer head and the lower hammer head reaches a set value.
6. The all-fiber profile forging forming method of a multi-jaw member according to claim 1, wherein the step S4 is: and (3) uniformly drawing the root of each petal of the forged blank by using an upper flat anvil and a lower flat anvil, pressing each petal of the full anvil along the hammer until the thickness of each petal reaches a set value, and finishing drawing forging.
7. The method for forming an all-fiber profile forging of a multi-jaw member according to claim 1, wherein the billet has a billet jaw (7) for holding the billet during the split forging and the elongation forging.
8. The all-fiber profile forging forming method of a multi-jaw member as claimed in claim 7, wherein said step S4 further comprises: and gas cutting the aligned blank root to remove the blank jaw (7).
9. The all-fiber profile forging method of a multi-jaw member as claimed in any one of claims 1 to 8, wherein said blank is a cylindrical blank satisfying:
6.162DL×LL＝1.75V0
DL/LL≤2.5
in the formula, DLIs the diameter of a cylindrical blank, LLIs the length of the cylindrical blank, and V0 is the volume of the finished product of the hook forging.
10. The all-fiber profile forging forming method for the multi-jaw member according to any one of claims 1 to 8, wherein the punch is in a frustum shape and is used for forming a central hole of the hook forging; the diameter of the lower end face of the punch is equal to the inner diameter of the center hole of the lifting hook forging.
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| CN114160727A (en) * | 2021-12-27 | 2022-03-11 | 通裕重工股份有限公司 | Forging method for large four-claw lifting hook forge piece |
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| CN102556837A (en) * | 2011-12-28 | 2012-07-11 | 哈尔滨正晨焊接切割设备制造有限公司 | Lifting hook manufactured by adopting large-thickness fine-cutting technology and large-section friction welding method |
| CN103071978A (en) * | 2013-01-10 | 2013-05-01 | 太仓久信精密模具有限公司 | Warm and cold combined forming process for claw pole of generator |
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2018
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| US3818746A (en) * | 1971-07-06 | 1974-06-25 | Tokai Rika Co Ltd | Rod end cold forming process |
| JPS59191539A (en) * | 1983-04-15 | 1984-10-30 | Hitachi Ltd | Forging machine |
| CN1628921A (en) * | 2003-12-26 | 2005-06-22 | 李克敏 | All fiber forging process for load-carrying vehicle hub axle and die therefor |
| CN101492141A (en) * | 2009-03-02 | 2009-07-29 | 大连华锐股份有限公司 | Large-scale crane hook set and processing method |
| CN102556837A (en) * | 2011-12-28 | 2012-07-11 | 哈尔滨正晨焊接切割设备制造有限公司 | Lifting hook manufactured by adopting large-thickness fine-cutting technology and large-section friction welding method |
| CN103071978A (en) * | 2013-01-10 | 2013-05-01 | 太仓久信精密模具有限公司 | Warm and cold combined forming process for claw pole of generator |
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| CN109433984A (en) | 2019-03-08 |
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