KR101578159B1 - Cast for manufacturing connecting rod preform and method for manufacturing connecting rod preform using the same - Google Patents

Cast for manufacturing connecting rod preform and method for manufacturing connecting rod preform using the same Download PDF

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Publication number
KR101578159B1
KR101578159B1 KR1020150074827A KR20150074827A KR101578159B1 KR 101578159 B1 KR101578159 B1 KR 101578159B1 KR 1020150074827 A KR1020150074827 A KR 1020150074827A KR 20150074827 A KR20150074827 A KR 20150074827A KR 101578159 B1 KR101578159 B1 KR 101578159B1
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South Korea
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space
small end
forging
connecting rod
small
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KR1020150074827A
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Korean (ko)
Inventor
김철표
김경표
김영규
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영진단조(주)
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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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/022—Open die forging
    • 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
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/766—Connecting rods

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The present invention relates to a connecting rod preform manufacturing apparatus for an engine which can upset and forge a large end portion on the basis of a dimension of a small end portion formed in an upsetting mold, and a method for manufacturing a connecting rod preformed article using the same.
That is, the present invention relates to an upset forging method in which a small end portion and a load portion of a heated workpiece are put into an upset forging die, a large portion is protruded through an inlet of a mold, and then a large protruding portion is struck in an axial direction A connecting rod preform manufacturing apparatus of an engine capable of accurately manufacturing a connecting rod according to a designed dimension by carrying out an operation of extending a section between a large end portion and a small end portion separated from the upset forging mold by a load allowable dimension, So as to provide a method of manufacturing a connecting rod preform.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold for manufacturing a connecting rod preform and a method for manufacturing a connecting rod preform using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for manufacturing a connecting rod preform and a method of manufacturing a connecting rod preform using the same, and more particularly, To a mold for manufacturing a connecting rod preform and a method for manufacturing a connecting rod preform using the same.

The engine connecting rod has a big end connected to the crankshaft, a small end connected to the piston, and a body for connecting the large end and the small end integrally, And is generally 1.5 to 2.5 times as large as the stroke. In the expansion stroke of the engine, the power received by the piston is transmitted to the crankshaft. On the other stroke, the movement of the crankshaft is transmitted to the piston. So that it is light in weight and high in mechanical strength.

For this purpose, the connecting rod is made by forging using mainly nickel-molybdenum steel or chrome-molybden steel.

1, the connecting rod includes a step of purchasing an ingot from a steel maker, a step of cutting the raw material according to a product standard, a step of forming a cut material A process of forging the heated material into a connecting rod shape, a heat treatment process for homogenizing the tissue and removing residual stress, a machining process for final shape machining, (Machining) process, internal and external inspection process, and packaging process.

In the manufacturing process of the connecting rod, the forging process includes a die forging process in which a heated material is processed into a final product shape by a die, and a die forging process in which a heated material is hammered by a hammer or the like and subjected to die forging or pre- And free forging.

At this time, parts such as connecting rods of an automobile engine, which are small in size and can be mass-produced, can be produced as a final product by directly forging a mold without forging. However, the connecting rod, Products such as front axle of commercial vehicle (front axle) and turbine blade of atomic power generator are manufactured by preforming after mold forging because they are medium and large products with weights ranging from several tens kilograms to several tons .

Particularly, for medium and large-sized forging products of marine engines, the success or failure of the forging process is determined according to the quality of the preformed product, It can save processing costs and can take the lead in price competition.

Hereinafter, a conventional method of manufacturing a connecting rod preform will be described.

Fig. 2 is a front view and a side view showing a preformed product of a connecting rod, and Fig. 3 is a process drawing showing a process of manufacturing a preformed product of a connecting rod.

2, the preform 10 of the connecting rod has a big end 12 connected to the crankshaft, a small end 16 connected to the piston, and a large end 12 connected to the piston. And a rod 14 integrally connecting the small end portion 16 and the small end portion 16. The preliminarily molded product 10 is finally manufactured through a heat treatment process and a machining process for final shape machining.

In order to manufacture the above-mentioned preformed connecting rod, a material having a predetermined diameter (for example,? 240) is first heated to a predetermined temperature for volume distribution, and then the heated material is heat- The distribution work for increasing the load and the portion for constituting the small end portion proceeds (refer to (1) to (2) in FIG. 3).

Next, referring to the small-end allowable dimension, the small-end first stretching is performed using the caulking operation (see ③ in Fig. 3).

At this time, the volume of the large end portion 12 becomes a standard when the first small end portion 16 is gradually increased to the allowable dimension.

Then, in order to construct the rod 14, which is a section between the large end 12 and the small end 16, when the first smallest extension of the small end 16 is permitted, And the second load increasing operation is performed (see Fig. 3 (4)).

After the second stretching operation, the preform 10 of the connecting rod consisting of the large end 12 and the small end 16 and the rod 14 is produced, but the large end 12 is allowed The process of making the dimension is further advanced (see [5] in FIG. 3), thereby completing the final connecting rod preform 10.

The finished preform thus obtained is subjected to a final product through a heat treatment process and a machining process for final shape processing.

For reference, the caulking operation is performed by laying the object on the lower die (anvil) and the upper die (ram), increasing its length through a hammer-operated flattening operation, then laying the extended portion on the lower die It is a kind of increasing work to finish.

However, the conventional method of manufacturing the connecting rod has the following problems as the small end and the rod are made to have the allowable dimensions through the cogging operation based on the volume of the large end portion.

First, at the time of distributing to constitute the small end based on the volume of the large end, that is, in the first increase operation by the caulking operation, there is no chance of correcting due to the operation mistake, so that the volume defect of the small end occurs, There is a problem that the connecting rod can not be manufactured.

Second, if the volume of the small end portion of the first increase operation occurs, even if the second increase is performed for the rod construction with reference to the allowable size of the small end portion, the volume defect of the rod due to the volume defect of the small end portion And consequently, there is a problem that the connecting rod can not be manufactured in a normal dimension.

Third, there is a problem that the volumetric criterion of the large end portion is unclear and volume defect occurs at the large end portion.

Fourth, a lot of machining allowance is required to reduce the failure of the connecting rod, but there is a problem in that manufacturing cost and product cost increase due to a lot of machining allowance.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an upset forging die in which a small end portion and a rod portion of a heated material are inserted into an upset forging die, The upset forging method in which the projected large end portion is struck in the axial direction is carried out and then the section between the large end portion and the small end portion separated from the upset forging mold is extended to the allowable load dimension so that the connecting rod preform is accurately manufactured The present invention provides a method for manufacturing a connecting rod preform and a method for manufacturing a connecting rod preform using the same.

According to an aspect of the present invention, there is provided an apparatus comprising: a support block supported on a floor; A molding block integrally formed with a hollow structure on the support block; A lower end of the forming block is formed with a small-end molding space having the same size as that of the small end of the connecting rod, and an upper end of the connecting block is provided with an open- And a large forging space of the connecting rod is formed.

According to another aspect of the present invention for achieving the above object, there is provided an apparatus for forming a large-sized forging space, Upset forging mold; A material heating step for manufacturing a connecting rod; Inserting the heated material into the small end molding space and the large end forging space of the mold; Upsetting the upper portion of the material exposed through the large-end forging space to the allowable dimensions of the large-end portion, thereby manufacturing the large end portion of the connecting rod; A rod forming step of deforming the material from the mold and then increasing a section between the large end and the small end to a load allowable dimension; The present invention also provides a method of manufacturing a connecting rod preform.

The lower end portion of the workpiece inserted in the small end molding space is formed into a small end portion of the connecting rod.

Further, the present invention is further characterized in that the offset forged large end portion is made to have an allowable dimension by using a flat work.

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

First, the upset forging process is performed in which the small end portion and the load portion of the heated material are inserted into the upset forging die, the large end portion is protruded through the inlet of the mold, and the large end portion is struck in the axial direction, The connecting rod preform can be manufactured exactly according to the designed dimensions by proceeding to increase the interval between the large end portion and the small end portion separated from the upset forging die to the allowable load dimension.

Second, since the small end portion is inserted into the upset forging mold in conformity with the small end dimension, it is possible to prevent the volume defect in the small end portion from occurring.

Third, since the small end portion is inserted into the upset forging die in conformity with the small end dimension, and the molding is completed in the upset forging die, it is possible to omit the small end end increasing work, Can be improved.

Fourth, the large end portion can be accurately machined to the dimensions by upsetting the large end portion on the basis of the small end portion size inserted into the upset forging die.

1 is a manufacturing process diagram of a connecting rod,
2 is a front view and a side view showing a preform of a connecting rod,
3 is a schematic cross-sectional view showing a process of manufacturing a preform of a connecting rod,
4 is a view showing an apparatus for manufacturing a connecting rod preform of an engine according to the present invention,
5 is a schematic sectional view showing a connecting rod preform production method using an apparatus for manufacturing a connecting rod preform of an engine according to the present invention,
6 is a cross-sectional perspective view showing a process of forming a large end portion on the basis of a small end portion dimension using an apparatus for manufacturing a connecting rod preformed product of an engine according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 4 is an apparatus for manufacturing a connecting rod preform of an engine according to the present invention, which shows an upset forging die for upset forging large portions on the basis of small end dimensions.

The upset forging die 20 is a die for increasing the dimension of the head portion, for example, a bolt type, and is a die for forging a large end portion on the basis of a small end portion dimension.

The mold 20 is composed of a support block 28 supported on the floor and a molding block 26 integrally formed on the support block with a hollow structure. Inside the molding block 26, An end molding space 22 and a large end forging space 24 are formed over the lower and upper spaces.

More specifically, a small-end molding space 22, which is the same as the small end of the connecting rod, is formed in the lower portion of the molding block 26, and on the upper side of the molding block 26, A large forging space 24 is formed for upset forging the large end portion to a designed dimension (allowable dimension).

At this time, the small end molding space 22 is formed to have the same inner diameter as that of the small end portion (diameter) of the designed connecting rod, and the large end forged space 24 also has the inner diameter size equal to that of the connecting rod.

Hereinafter, a connecting rod manufacturing apparatus of the present invention having the above configuration, that is, a method of manufacturing a connecting rod preform using the upset forging die will be described.

5 is a schematic cross-sectional view showing a method of manufacturing a connecting rod using an apparatus for manufacturing a connecting rod preform of an engine according to the present invention, and Fig. 6 is a cross- Sectional view showing a process of forming a large end portion on a dimensional basis.

First, in order to produce a preform of a connecting rod, a material having a predetermined diameter (for example,? 240) is first heated to a predetermined temperature.

Then, a small end molding space 22, which is the same as the size of the small end portion, is formed in the lower portion, and an upper end forging cavity 24 in which an open large end forging space 24 for upset forging is formed, Insert the heated material.

After the heated material is inserted into the small end molding space 22 and the large end forging space 24 of the mold 20, the upper portion of the material exposed through the large end forging space 24 is inserted into the allowable dimensions The upper end portion 12 of the connecting rod is manufactured (see (2) in Fig. 5).

6, after the heated constant diameter material is inserted into the small-end molding space 22 and the large-end forging space 24 of the mold 20, the lower portion of the material is inserted into the small- The upper end of the material is spaced apart from the inner diameter of the large end forging space 24. The upper end of the large end forging space 24 is formed in the small end molding space 22,

6, by performing a forging operation in which the upper surface of the material exposed to the outside through the large-end forging space 24 is knocked by using a forging mechanism (for example, a flat mechanism) The upper portion of the material is filled in the large-end forging space 24 and is formed into a large-end portion.

Thus, through the forging operation on the upper surface of the material, the small end portion 16 is formed in the designed size in the small end forming space 22 of the mold, and the large end forging space 24 The large end 12 is easily forged into a designed size.

Therefore, since the small end 16 is inserted into the small end molding space 22 of the upset forging mold 20 in accordance with the small end dimensions, it is possible to omit the small end end enlarging operation, It is possible to prevent the volume defect of the small end portion from being generated in the connecting rod, and to improve the workability and productivity of the connecting rod.

Next, after the large-end portion 12 and the small-end portion 16 are made of a material having a designed size, the portion between the large end portion 12 and the small end portion 16 is demolded from the mold 20, The step of forming the rod 14 for increasing the diameter is performed.

That is, in order to construct the rod 14 which is a section between the large end 12 and the small end 16, the load increasing operation using the caulking operation is performed with reference to the load allowable dimension, A rod 14 having a designed dimension is formed between the end portions 16 (see (3) and (4) in FIG. 5).

Finally, the preforming of the connecting rod 10 is completed through the step of making the offset-forged large-end portion 12 as described above to conform to the allowable dimensions (design shape and dimensions) by using a flat work.

As described above, the small end portion and the rod portion of the heated workpiece are inserted into the upset forging die 20, the large end portion is protruded through the mouth of the die, And then an operation for increasing the interval between the large end portion 12 and the small end portion 16 separated from the upset forging die 20 to the load allowable size is carried out, A rod preform can be produced.

On the other hand, the small-end molding space 22 and the large-end forging space 24 may be coated with a wear-resistant coating layer.

Here, the wear-resistant coating layer is formed by mixing 96 to 98% by weight of chromium oxide (Cr 2 O 3 ) and 2 to 4% by weight of titanium dioxide (TiO 2 ).

Here, chromium oxide (Cr 2 O 3) and when using hayeoseo mixing titanium dioxide (TiO 2), the mixing ratio of these, chrome oxide (Cr 2 O 3) Titanium dioxide (TiO 2) in 96-98% by weight 2 By weight to 4% by weight.

When the mixing ratio of chromium oxide (Cr 2 O 3 ) is less than 96 to 98%, the coating of chromium oxide (Cr 2 O 3 ) is often broken in an environment such as a high temperature, The rust preventive effect of the outer circumferential surface of the large-diameter forging space 22 and the large-diameter forging space 24 was drastically reduced.

When the mixing ratio of titanium dioxide (TiO 2 ) is less than 2 to 4 wt%, the effect of titanium dioxide (TiO 2 ) is insignificant so that the purpose of mixing it with chromium oxide (Cr 2 O 3 ) is discolored. That is, the titanium dioxide (TiO 2 ) decomposes and removes foreign matter adhering to the periphery of the small end forming space 22 and the large end forging space 24, so that the small end forming space 22 and the large end forging space 24 If the mixing ratio is less than 2 to 4% by weight, it takes a long time to decompose the adhered foreign matters.

The coating layer made of such materials has a thickness of 50 to 600 mu m around the small end forming space 22 and the large end forging space 24, and has a hardness of 900 to 1000 HV and a surface roughness of 0.1 to 0.3 mu m Lt; / RTI >

The abrasion resistant coating layer is sprayed by spraying the powder powder and the gas at 1400 DEG C at a Mach 2 speed around the periphery of the small end forming space 22 and the large end forging space 24 and spraying the powder at 50 to 600 mu m .

If the thickness of the wear-resistant coating layer is less than 50 탆, the above-mentioned effect of the ceramic coating layer can not be guaranteed. If the thickness of the wear-resistant coating layer exceeds 600 탆, the above- There is a problem that working time and material cost are wasted.

The temperature of the A small end forming space 22 and the large end forging space 24 is raised while the abrasion resistant coating layer is coated on the small end forming space 22 and the large end forging space 24, The small end forming space 22 and the large end forging space 24 are cooled by a cooling device (not shown) so as to prevent deformation of the space 22 and the large end forging space 24, .

A sealing material made of anhydrous chromic acid (CrO 3 ) made of a metal-based glass quartz system may further be applied to the periphery of the abrasion-resistant coating layer. Anhydrous chromic acid is applied as an inorganic sealing material around a coating layer made of chromium nickel powder.

Anhydrous chromic acid (CrO 3 ) is used in places that require high abrasion resistance, lubricity, heat resistance, corrosion resistance and releasability, is not discolored in the atmosphere, has high durability, and has good abrasion resistance and corrosion resistance. The coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m. If the coating thickness of the sealing material is less than 0.3 占 퐉, the sealing material easily peels off even in a slight scratch groove, so that the above-mentioned effect can not be obtained. If the coating thickness of the sealing material is made thick enough to exceed 0.5 탆, pin holes, cracks, and the like will increase on the plated surface. Therefore, the coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m.

Therefore, since the coating layer having excellent wear resistance and oxidation resistance is formed around the small end molding space 22 and the large end forging space 24, the small end molding space 22 and the large end forging space 24 are worn or oxidized And thus the life of the product is prolonged.

In addition, the molding block 26 and the support block 28 may be coated with an anti-fouling coating layer so as to effectively prevent and remove the adhesion of contaminants.

The composition for the antifouling coating layer contains boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2, and the total content of boric acid and sodium carbonate is 1 to 10% by weight based on the total aqueous solution. In addition, sodium carbonate or calcium carbonate may be used as a material for improving the coating property of the antifouling coating layer, but sodium carbonate may be preferably used. The molar ratio of boric acid to sodium carbonate is preferably 1: 0.01 to 1: 2. If the molar ratio is out of the above range, the coating property of the substrate may be decreased or the moisture adsorption on the surface of the coating may increase.

The boric acid and sodium carbonate are preferably used in an amount of 1 to 10% by weight based on the total weight of the composition. When the amount is less than 1% by weight, the coating properties of the base material deteriorate. When the amount exceeds 10% by weight, easy to do.

On the other hand, as a method of coating the composition for the antifouling coating layer on a substrate, it is preferable to coat it by a spray method. The thickness of the final coating film on the substrate is preferably 500 to 2000 angstroms, and more preferably 1000 to 2000 angstroms. When the thickness of the coating film is less than 500 ANGSTROM, there is a problem that it deteriorates in the case of a high-temperature heat treatment. When the thickness of the coating film is more than 2000 ANGSTROM, crystallization of the coating surface tends to occur.

The composition for the antifouling coating layer may be prepared by adding 0.1 mol of boric acid and 0.05 mol of sodium carbonate to 1000 mL of distilled water and then stirring.

Since the anti-fouling coating layer is coated on the molding block 26 and the support block 28 so as to effectively prevent and remove the contaminants from being adhered to the molding block 26 and the support block 28, Accordingly, the quality of the product is improved.

10: Connecting rod
12:
14: Load
16: Small end
20: Mold
22: Small end molding space
24: Large forging space
26: Molding block
28: Support block

Claims (4)

For the production of connecting rod preforms of an engine, there is provided an upset forging die 20 for upset forging the large end 12 on the small end 16 dimension;
A support block 28 supported on the floor, and a molding block 26 integrally formed on the support block in a hollow structure;
The lower end of the molding block 26 is formed with a small end molding space 22 which is the same as that of the small end of the connecting rod and the upper end of the molding block 26 is provided with a large- An open large end forging space 24 for upset forging is formed;
The small end forming space 22 is formed with an inner diameter dimension equal to the dimension of the small end 16 of the designed connecting rod and the large end forging space 24 has an inner diameter dimension equal to the large end 12 dimension of the connecting rod;
The small end portion 16 is formed in the designed size in the small end forming space 22 of the mold and the large end portion 12 is formed in the multi-end forging space 24 of the mold on the basis of the small end dimensions, ;
Since the small end 16 is inserted in the small end molding space 22 of the upset forging mold 20 in accordance with the small end 16 dimension, the operation for increasing the small end 16 can be omitted, 16) is prevented from occurring;
An abrasion resistant coating layer is coated on the small end molding space 22 and the large end forging space 24. The abrasion resistant coating layer comprises 96 to 98 wt% chromium oxide (Cr 2 O 3 ) and titanium dioxide (TiO 2 ) Wherein the abrasion resistant coating layer has a thickness of 50 to 600 mu m around the small end forming space 22 and the large end forging space 24 and has a hardness of 900 to 1000 HV , And the surface roughness is maintained at 0.1 to 0.3 mu m. The abrasion resistant coating layer is formed by coating the powdered powder and the gas at 1400 DEG C at a Mach 2 speed of about 2 in the small end molding space 22 and the large end forging space 24 while being coated with a wear-resistant coating layer on the small-end molding space 22 and the large-end forging space 24, the small-end molding space 22 and the large- The temperature of the space 24 is raised so that the deformation of the heated small end forming space 22 and the large end forging space 24 , The small end molding space 22 and the large end forging space 24 are cooled by a cooling device so as to maintain a temperature of 150 to 200 DEG C. Around the wear-resistant coating layer, anhydrous chromic acid ( CrO 3) as the sealing material, and further comprising applying, the coating thickness of the sealing material is 0.3~0.5㎛ gt;
The anti-fouling coating layer is coated on the molding block 26 and the support block 28 so as to prevent and remove the contaminants, and the composition for the anti-fouling coating layer includes boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2 Wherein the total content of boric acid and sodium carbonate is 1 to 10% by weight based on the total weight of the aqueous solution, the composition for the antifouling coating layer is coated by a spraying method, and the thickness of the coating film is 500 to 2000 ANGSTROM mold.
For the production of connecting rod preforms of an engine, there is provided an upset forging die 20 for upset forging the large end 12 on the small end 16 dimension; A support block 28 supported on the floor, and a molding block 26 integrally formed on the support block in a hollow structure; The lower end of the molding block 26 is formed with a small end molding space 22 which is the same as that of the small end of the connecting rod and the upper end of the molding block 26 is provided with a large- An open large end forging space 24 for upset forging is formed; The small end forming space 22 is formed with an inner diameter dimension equal to the dimension of the small end 16 of the designed connecting rod and the large end forging space 24 has an inner diameter dimension equal to the large end 12 dimension of the connecting rod; The small end portion 16 is formed in the designed size in the small end forming space 22 of the mold and the large end portion 12 is formed in the multi-end forging space 24 of the mold on the basis of the small end dimensions, ; Since the small end 16 is inserted in the small end molding space 22 of the upset forging mold 20 in accordance with the small end 16 dimension, the operation for increasing the small end 16 can be omitted, 16) is prevented from occurring; An abrasion resistant coating layer is coated on the small end molding space 22 and the large end forging space 24. The abrasion resistant coating layer comprises 96 to 98 wt% chromium oxide (Cr 2 O 3 ) and titanium dioxide (TiO 2 ) Wherein the abrasion resistant coating layer has a thickness of 50 to 600 mu m around the small end forming space 22 and the large end forging space 24 and has a hardness of 900 to 1000 HV , And the surface roughness is maintained at 0.1 to 0.3 mu m. The abrasion resistant coating layer is formed by coating the powdered powder and the gas at 1400 DEG C at a Mach 2 speed of about 2 in the small end molding space 22 and the large end forging space 24 while being coated with a wear-resistant coating layer on the small-end molding space 22 and the large-end forging space 24, the small-end molding space 22 and the large- The temperature of the space 24 is raised so that the deformation of the heated small end forming space 22 and the large end forging space 24 , The small end molding space 22 and the large end forging space 24 are cooled by a cooling device so as to maintain a temperature of 150 to 200 DEG C. Around the wear-resistant coating layer, anhydrous chromic acid ( CrO 3) as the sealing material, and further comprising applying, the coating thickness of the sealing material is 0.3~0.5㎛ gt; The anti-fouling coating layer is coated on the molding block 26 and the support block 28 so as to prevent and remove the contaminants, and the composition for the anti-fouling coating layer includes boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2 And the total content of boric acid and sodium carbonate is 1 to 10% by weight based on the total weight of the aqueous solution. The composition for the antifouling coating layer is coated by spraying, and the thickness of the coating layer is 500 to 2000 ANGSTROM As a method for this,
A step for forming an upset forging die 20 in which a small end molding space 22 having the same size as the size of the small end portion is formed in the lower portion and an open large end forging space 24 for upset forging the large end portion to a permissible dimension, ;
A material heating step for manufacturing a connecting rod;
Inserting the heated material into the small end molding space (22) and the large end forging space (24) of the mold (20);
Upsetting the upper portion of the material exposed through the large end forging space (24) to the allowable dimensions of the large end portion, thereby manufacturing the large end portion (12) of the connecting rod;
Forming a rod (14) that deforms the material from the mold and then increases the interval between the large end (12) and the small end (16) to a load allowable size;
The lower end portion of the material inserted in the small end molding space 22 is formed into the small end portion 16 of the connecting rod;
Further comprising the step of making the offset forged extruded part (12) to have an allowable dimension using a flattening operation. ≪ RTI ID = 0.0 > 11. < / RTI > delete delete
KR1020150074827A 2015-05-28 2015-05-28 Cast for manufacturing connecting rod preform and method for manufacturing connecting rod preform using the same KR101578159B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112719175A (en) * 2020-12-18 2021-04-30 陕西宏远航空锻造有限责任公司 Die forging forming method and device for GH4169 alloy long shaft type forge piece

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KR101173054B1 (en) * 2010-07-08 2012-08-13 현대자동차주식회사 Alloy compound composite for connecting rod and menufacturing method for connecting rod using it
JP2012232328A (en) * 2011-05-02 2012-11-29 Nissan Motor Co Ltd Method and device for closed-forging connecting rod
KR101224977B1 (en) * 2011-10-12 2013-01-22 진산금속 주식회사 Device for hot forging a outer-race of continuous velocity joint and method for hot forging thereof

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JP2545277B2 (en) * 1988-11-18 1996-10-16 本田技研工業株式会社 Conrod closing forging device
KR101173054B1 (en) * 2010-07-08 2012-08-13 현대자동차주식회사 Alloy compound composite for connecting rod and menufacturing method for connecting rod using it
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KR101224977B1 (en) * 2011-10-12 2013-01-22 진산금속 주식회사 Device for hot forging a outer-race of continuous velocity joint and method for hot forging thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112719175A (en) * 2020-12-18 2021-04-30 陕西宏远航空锻造有限责任公司 Die forging forming method and device for GH4169 alloy long shaft type forge piece

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