CN111015092A - Anti-fatigue R6-grade connecting shackle and forging method thereof - Google Patents

Abstract

An antifatigue R6 grade connecting shackle and a forging method thereof, the shackle comprises: the body of breaking out, the horizontal round pin of breaking out and the nut of breaking out include following step: 1) blanking; 2) drawing out the shackle body; 3) rolling and forging the shackle body chain diameter; 4) flattening and punching two ends of the shackle body; 5) forming the shackle transverse pin; 6) trimming and polishing; 7) the shackle body is bent. The invention discloses an anti-fatigue R6-grade connecting shackle and a forging method thereof, 1, the stress concentration coefficient of a bending sensitive part is reduced, the strength of a product is improved, and the fatigue life of the product is prolonged. 2. The manufacturing process is convenient to operate, and products meeting the requirements of size and shape can be forged. By increasing the diameter of the ring crown, the abrasion and corrosion allowance is increased, the stress distribution is improved, and the service life of the product is prolonged.

Description

Anti-fatigue R6-grade connecting shackle and forging method thereof

Technical Field

The invention relates to the field of ships and marine engineering matching, in particular to an anti-fatigue R6-grade connecting shackle and a forging method thereof.

Background

The connecting shackle for ships and maritime workers is a detachable connecting component and has the technical characteristics of high strength and high toughness. The bent portion of the conventional connecting shackle is a stress concentration portion, and is easily worn during use, resulting in further reduction of the diameter of the bent portion, reduction of the strength of the product, and reduction of the service life of the product.

Disclosure of Invention

The invention aims to solve the technical problems and provides an anti-fatigue R6-grade connecting shackle, and a special forging process is designed according to the special geometric shape of the shackle.

The invention is realized by the following steps: by increasing the diameter of the bend, a connection shackle of variable cross-section is formed, the corresponding forging method comprising the following steps:

1) discharging

The saw cut edges and corners are removed, and the smooth surface of the blanking piece is ensured;

2) lengthening of shackle body

Putting the raw material round steel into a flame furnace for heating; heating to 1000-1200 ℃, drawing out the heated round steel by using an air hammer, wherein the finish forging temperature is not lower than 830 ℃; no interlayer, cracking, grooves and other defects which reduce the performance of the product are needed during forging;

3) shackle body chain diameter roll forging

The chain diameter part of the product is a variable cross section, a special forging die is needed for roll forging, the roll forging needs to ensure that the deformation of each hammering is not more than 2mm, hammering is carried out after each hammering is carried out by rotating 30-45 degrees, and folding is avoided in the roll forging process;

4) flattening and punching at two ends of shackle body

Respectively flattening two ends of the drawn round blank to the size required by a drawing, then punching holes at the flattened positions of the two ends to the size required by the drawing, wherein the punched round blank does not have any defects of an interlayer, cracks, grooves and product performance reduction when being flattened;

5) shackle cross pin formation

Putting the raw material round steel into a flame furnace for heating; upsetting and drawing the heated round steel by using an air hammer, then putting the round steel into a forming die, heating to 1100-1200 ℃, and carrying out forging forming by using the forming die, wherein the final forging temperature is not lower than 830 ℃, and no interlayer, cracking, groove or other defects for reducing the product performance exist in the forging process;

6) edging and polishing

Removing the flash produced by the molded shackle cross pin by acetylene gas cutting, and polishing by a grinding machine to obtain a smooth surface;

7) shackle body bend

Bending the middle section round material of the blank with two formed ends, inserting the round material into an end hole by using a shackle transverse pin, and then sleeving the hole at the other bent end into the shackle transverse pin, bending to the size required by a drawing, wherein the round material does not have any interlayer, cracks, grooves or other defects which reduce the performance of products during bending.

The invention ensures that the diameter of the ring crown part is increased through the special forging die, avoids the stress concentration of the bent part and the adjacent part, and improves the integral fatigue resistance of the product; meanwhile, the abrasion and corrosion allowance is increased, and the strength of the product is prevented from being reduced due to abrasion or corrosion in use; in addition, because the sizes of the ball head and the straight body part are not increased, the adjacent components can be ensured to be sleeved smoothly.

Drawings

FIG. 1 is a schematic view of the structure of the present invention

Fig. 2 is a side view of the present invention.

Detailed Description

1) Blanking, namely clearing edges and corners of a saw cut to ensure that the surface of a blanking piece is smooth; 2) drawing out the shackle body, and putting the raw material round steel into a flame furnace for heating; heating to 1000-1200 ℃, drawing out the heated round steel by using an air hammer, wherein the finish forging temperature is not lower than 830 ℃; no interlayer, cracking, grooves and other defects which reduce the performance of the product are needed during forging; 3) the shackle body chain diameter roll forging needs to be carried out by using a special forging die due to the fact that the chain diameter part of a product is a variable cross section, the roll forging needs to ensure that the hammering deformation does not exceed 2mm each time, hammering is carried out after 30-45 degrees of rotation after each hammering, and folding is avoided in the roll forging process; 4) beating and punching two ends of the shackle body, respectively beating and flattening two ends of a drawn round blank to the size required by a drawing, then punching holes at the beating and flattening positions of the two ends to the size required by the drawing, wherein no interlayer, cracking, groove or other defects for reducing the product performance exist during beating and flattening; 5) forming the shackle cross pin, and heating the raw material round steel in a flame furnace; upsetting and drawing the heated round steel by using an air hammer, then putting the round steel into a forming die, heating to 1100-1200 ℃, and carrying out forging forming by using the forming die, wherein the final forging temperature is not lower than 830 ℃, and no interlayer, cracking, groove or other defects for reducing the product performance exist in the forging process; 6) trimming and polishing, namely removing the manufactured burrs of the molded shackle transverse pin by acetylene gas cutting, and polishing by using a grinding machine after the burrs are removed to obtain a smooth surface; 7) bending the shackle body, bending the middle section round material of the blank with two formed ends, inserting the shackle cross pin into an end hole, sleeving the hole at the other bent end into the shackle cross pin, bending to the size required by the drawing, and avoiding interlayer, cracking, grooves and other defects of reducing the product performance during bending.

The invention ensures that the diameter of the ring crown part is increased through the special forging die, avoids the stress concentration of the bent part and the adjacent part, and improves the integral fatigue resistance of the product; meanwhile, the abrasion and corrosion allowance is increased, and the strength of the product is prevented from being reduced due to abrasion or corrosion in use; in addition, because the sizes of the ball head and the straight body part are not increased, the adjacent components can be ensured to be sleeved smoothly.

Claims (2)

1. The utility model provides an antifatigue R6 level connection shackle which characterized in that: the shackle comprises a shackle body (1), a shackle transverse pin (2) and a shackle nut (3), wherein the diameter of the bent part of the shackle body is 1-2 times of that of a straight body part, and the shackle is used for improving the wear-resisting property and the fatigue life of the ring crown part of the shackle body.

2. The forging method of the fatigue-resistant R6-grade connection shackle of claim 1, comprising the steps of:

1) discharging

The saw cut edges and corners are removed, and the smooth surface of the blanking piece is ensured;

2) lengthening of shackle body

Putting the raw material round steel into a flame furnace for heating; heating to 1000-1200 ℃, drawing out the heated round steel by using an air hammer, wherein the finish forging temperature is not lower than 830 ℃; no interlayer, cracking, grooves and other defects which reduce the performance of the product are needed during forging;

3) shackle body chain diameter roll forging

The chain diameter part of the product is a variable cross section, a special forging die is needed for roll forging, the roll forging needs to ensure that the deformation of each hammering is not more than 2mm, hammering is carried out after each hammering is carried out by rotating 30-45 degrees, and folding is avoided in the roll forging process;

4) flattening and punching at two ends of shackle body

Respectively flattening two ends of the drawn round blank to the size required by a drawing, then punching holes at the flattened positions of the two ends to the size required by the drawing, wherein the punched round blank does not have any defects of an interlayer, cracks, grooves and product performance reduction when being flattened;

5) shackle cross pin formation

Putting the raw material round steel into a flame furnace for heating; upsetting and drawing the heated round steel by using an air hammer, then putting the round steel into a forming die, heating to 1100-1200 ℃, and carrying out forging forming by using the forming die, wherein the final forging temperature is not lower than 830 ℃, and no interlayer, cracking, groove or other defects for reducing the product performance exist in the forging process;

6) edging and polishing

Removing the flash produced by the molded shackle cross pin by acetylene gas cutting, and polishing by a grinding machine to obtain a smooth surface;

7) shackle body bend

Bending the middle section round material of the blank with two formed ends, inserting the round material into an end hole by using a shackle transverse pin, and then sleeving the hole at the other bent end into the shackle transverse pin, bending to the size required by a drawing, wherein the round material does not have any interlayer, cracks, grooves or other defects which reduce the performance of products during bending.

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