High-strength corrosion-resistant welding chain and manufacturing process

Abstract

The invention provides a high-strength corrosion-resistant welding chain and a manufacturing process, and relates to the technical field of chain equipment. The high-strength corrosion-resistant welded chain comprises a bent chain plate A, a bent chain plate B, a pin shaft, a sleeve and a locking pin, the bent chain plate A, the bent chain plate B and the sleeve are welded into a whole through girth welding to form a bent chain link, the bent chain links are connected in series through the pin shaft to form a strip, press fitting of the pin shaft is achieved through an outcrop mold, and finally the locking pin is installed. And assembling of the chain is completed. A hot punching technology is adopted, punching force is reduced, particularly, under the condition of small-gap punching, a punching nail is punched into a chain plate hole, the degree of finish of the punched hole is very good, when stainless steel is welded, through the denaturation characteristic, the deformation size is added on a clamp mandrel, the chain plate is reversely deformed in advance, the chain plate is forwardly deformed after being welded, and the deformed chain link reaches the drawing size, so that the production efficiency is greatly improved. And the surface quality of the chain is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chain equipment, in particular to a high-strength corrosion-resistant welding chain and a manufacturing process. Background Art

[0002] Chains are widely used in various industries. In the grain and oil machinery industry, they are commonly used to transport corn, wheat, soybeans and other foods. The chains are required to have strong conveying capacity and a long service life. Therefore, the chain strength must be high and the wear resistance must be good. The working environment of the chain is very harsh, often accompanied by a mixture of water and oil, which is relatively corrosive. The chain must have strong corrosion resistance so that the chain will not be easily corroded.

[0003] In order to meet the needs of customers, we have developed and designed high-strength, high-wear-resistant and corrosion-resistant welded bent plate chains, and formulated a manufacturing process suitable for stainless steel welded bent plate chains. Summary of the Invention

[0004] (1) Technical problems solved In view of the deficiencies in the prior art, the present invention provides a high-strength corrosion-resistant welded chain and a manufacturing process, which solves the problems of high wear resistance and high corrosion resistance that traditional chains do not have.

[0005] (2) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-strength, corrosion-resistant welded chain and manufacturing process, comprising a bent link plate A, a bent link plate B, a pin, a sleeve, and a locking pin. The bent link plates A, B, and sleeve are welded together by girth welding to form a single bent link. Each bent link is connected in series by a pin, which is then press-fitted using a die. Finally, the locking pin is installed to complete the chain assembly. To meet the chain's conveying capacity and service life requirements, the chain must possess high tensile strength, high wear resistance, and strong corrosion resistance. Both bent link plates A and B are made of 316L hot-rolled stainless steel strips. The material manufacturer is required to perform multiple hot-rolling processes to increase the hardness of the chain plates. High hardness is required to meet the high strength requirements. Stainless steel provides excellent corrosion resistance. The pin and sleeve are made of 630 stainless steel. Vacuum heat treatment is used to achieve a relatively high hardness, improving the wear resistance of the pin and sleeve, thereby enhancing the wear resistance of the chain.

[0006] Preferably, the manufacturing process of the bent link plate A and the bent link plate B is as follows: A. After the raw materials enter the factory, the material and hardness test are carried out. The hardness is greater than 28HRC and it is qualified; B. The material that has passed the inspection in step A is fed through a shearing machine; C. Place the material obtained in step B into a tempering furnace and anneal at 240° for 2 hours to achieve a softening effect; D. After the tempering in step C, the blank is punched through a die to achieve the chain plate punching and then the chain plate is printed; E. The material printed in step D is bent through a bending die. Considering that the chain plate is easily deformed during welding, the bending height of the material is 1 mm higher than that of conventional bending, and deformation size is reserved; F. After the material is bent in step E, it is punched twice on the secondary punching die to meet the hole accuracy and bright band; G. After the punching in step F, the material is cleaned and degreased by a polishing machine to make it bright.

[0007] Preferably, the pin and sleeve are manufactured through three steps of vacuum heat treatment, fine grinding of the outer circle and cleaning, degreasing and brightening by a finishing machine.

[0008] Preferably, the assembly process of the chain link is as follows: A. The bent link plate A, bent link plate B, and sleeve are welded by girth welding. The surface of the sleeve is coated with anti-splash liquid to form a welded chain link. In this way, there is no welding slag on the surface of the chain link sleeve after welding, which reduces the time for removing the welding slag; B. Check the concentricity of the holes of the chain links described in step B on the leveling fixture; C. Clean and degrease the chain links that have passed the concentricity test using a finishing machine to make them bright.

[0009] Preferably, the assembly and packaging steps of the chain are as follows: A. Connect the chain links in series through the pins and then press the pins into strips through a mold. Install the locking pins after the strips are assembled and pack them for storage. Working principle: The hardness of the raw material must be greater than 28HRC, so that the tension of the chain can be achieved. The chain plate material is heated at 240° for 2 hours for annealing, and the shape and holes are punched on the blanking die. The hot punching technology is used to reduce the punching force. Especially under the condition of small gap punching, the punching nail is punched into the hole of the chain plate, and the punched hole has very good finish. The distance between the punching nail and the half plate thickness is 6mm, and the upper part is thinned to reduce the contact area between the punching nail and the hole wall of the chain plate, thereby improving the stripping effect. When the hardness of stainless steel material is high, the cold bending technology is realized by the punching machine. The material is prone to rebound, and the bending size cannot meet the requirements of the drawing. According to the rebound amount, we redesigned the bending mold to eliminate the rebound and ensure the size requirements. When welding stainless steel, we add the deformation size on the fixture core shaft through the deformation characteristics, and let the chain plate deform in reverse in advance. After welding, the chain plate deforms forward, and the deformed chain link reaches the drawing size. The hole is positioned by the locating pin to ensure the hole concentricity requirements. The welded chain link needs to use a leveling fixture to detect the concentricity of the four holes. The concentricity is less than 0.2mm, which provides a guarantee for the subsequent precise assembly of the chain. The process of correcting the chain link after welding is eliminated, which avoids the scratches on the chain plate surface when correcting the chain link, and improves the surface quality of the chain. (3) Beneficial effects

[0010] The present invention provides a high-strength, corrosion-resistant welding chain and a manufacturing process. It has the following beneficial effects: This structure prepares a high-strength, corrosion-resistant welded chain and manufacturing process. This utilizes hot stamping technology to reduce blanking force. Especially under small-gap blanking conditions, the punching pins are punched into the chain plate holes, resulting in very good hole finish. During stainless steel welding, the deformability characteristic allows the deformation dimension to be added to the fixture mandrel, allowing the chain plates to deform in reverse in advance. After welding, the chain plates deform forward, and the deformed chain links meet the drawing dimensions. The connected chain links are then tested for concentricity of the four holes using a leveling fixture. The concentricity must be less than 0.2 mm, ensuring the subsequent precise assembly of the chain. This eliminates the need for post-weld deformation correction of the chain links, avoiding scratches on the chain plate surface during correction and improving the chain's surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the chain assembly structure of the present invention; Figure 2 Schematic diagram of the rebound of the chain plate during the punching process of the present invention; Figure 3 This is a schematic diagram of the chain plate rebound structure design of the present invention; Figure 4 This is a comparison diagram of the chain link before and after welding of the present invention; Figure 5 This is a schematic diagram of the circumferential seam welding installation of the present invention.

[0012] Among them, 1. Processing box; 2. Hot pressing fan blades; 3. Mounting seat; 4. Mounting elbow; 5. Suspension cylinder; 6. Servo motor; 7. Connecting rod; 8. Electromagnetic adsorption part; 9. Residual material collection box; 10. Diversion protrusion; 11. Heating lamp; 12. Mounting long pole. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0014] like Figure 1-5 As shown, an embodiment of the present invention provides a high-strength, corrosion-resistant welded chain and manufacturing process, comprising a bent link plate A, a bent link plate B, a pin, a sleeve, and a locking pin. The bent link plates A, B, and the sleeve are welded together by circumferential seam welding to form a bent link. Each bent link is connected in series by a pin, which is then pressed into place using an exposed die. Finally, the locking pin is installed to complete the chain assembly. To meet the chain's conveying capacity and service life requirements, the chain is required to have high tensile strength, high wear resistance, and strong corrosion resistance. Both bent link plates A and B are made of 316L stainless steel hot-rolled strips. Material manufacturers are required to increase the hardness of the chain plates through multiple hot-rolling processes and rolling the raw materials. High hardness is required to meet the high strength requirements. Stainless steel meets the corrosion resistance requirements. The pin and sleeve are made of 630 material. Vacuum heat treatment technology is used to achieve a relatively high hardness, which improves the wear resistance of the pin and sleeve, thereby improving the wear resistance of the chain.

[0015] The manufacturing process of bent link plate A and bent link plate B is as follows: A. After the raw materials enter the factory, the material and hardness test are carried out. The hardness is greater than 28HRC and it is qualified; B. The materials that have passed the inspection in step A are unloaded through the shearing machine; C. Place the material from step B into a tempering furnace and anneal at 240° for 2 hours to soften the material; D. After the tempering in step C, the blank is punched through a die to realize the punching of the chain plate and then the chain plate is printed; E. The material after D printing is bent through a bending die. Considering that the chain plate is easily deformed during welding in the later stage, the bending height of the material is 1mm higher than the conventional bending, and the deformation size is reserved; F. After the material is bent in step E, it is punched twice on the secondary punching die to meet the hole accuracy and bright band; G. After the punching in step F, the material is cleaned and degreased by a polishing machine to make it bright.

[0016] The pin and sleeve are manufactured through three steps: vacuum heat treatment, fine grinding of the outer circle and cleaning, degreasing and brightening by a finishing machine. The assembly process of the chain link is as follows: A, bent link plate A, bent link plate B, and sleeve are welded by girth welding. The sleeve surface is coated with anti-splash liquid to form a welded chain link. In this way, there is no welding slag on the surface of the chain link sleeve after welding, which reduces the time for removing welding slag. B. Check the concentricity of the hole of the chain link in step B on the leveling fixture; C. Clean and degrease the chain links that have passed the concentricity test with a finishing machine to make them bright.

[0017] The assembly and packaging steps of the chain are as follows: A. Connect the chain links in series through the pins and then press the pins into strips through a mold. Install the locking pins after the strips are assembled and pack them for storage.

[0018] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength, corrosion-resistant welding chain and manufacturing process, characterized by: It includes a bent chain plate A, a bent chain plate B, a pin, a sleeve and a locking pin. The bent chain plate A, the bent chain plate B and the sleeve are welded into a whole through annular seam welding to form a bent chain link. The bent chain links are connected in series into strips through a pin, and the pin is pressed into place through an exposed mold. Finally, the locking pin is installed to complete the assembly of the chain. The bent chain plate A and the bent chain plate B are both made of stainless steel 316L hot-rolled strips, and the pin and sleeve are made of 630 material.

2. A high-strength, corrosion-resistant welding chain and manufacturing process according to claim 1, characterized in that: The manufacturing process of the bent link plate A and the bent link plate B is as follows: A. After the raw materials enter the factory, the material and hardness test are carried out. The hardness is greater than 28HRC and it is qualified; B. The material that has passed the inspection in step A is fed through a shearing machine; C. Place the material obtained in step B into a tempering furnace and anneal at 240° for 2 hours to achieve a softening effect; D. After the tempering in step C, the blank is punched through a die to achieve the chain plate punching and then the chain plate is printed; E. The material printed in step D is bent through a bending die. Considering that the chain plate is easily deformed during welding, the bending height of the material is 1 mm higher than that of conventional bending, and deformation size is reserved; F. After the material is bent in step E, it is punched twice on the secondary punching die to meet the hole accuracy and bright band; G. After the punching in step F, the material is cleaned and degreased by a polishing machine to make it bright.

3. The high-strength, corrosion-resistant welding chain and manufacturing process according to claim 1, characterized in that: The pin and sleeve are manufactured through three steps: vacuum heat treatment, fine grinding of the outer circle, and cleaning, degreasing and brightening by a finishing machine.

4. The high-strength, corrosion-resistant welding chain and manufacturing process according to claim 1, characterized in that: The assembly process of the chain link is as follows: A. The bent link plate A, bent link plate B, and sleeve are welded by girth welding. The surface of the sleeve is coated with anti-splash liquid to form a welded chain link. In this way, there is no welding slag on the surface of the chain link sleeve after welding, which reduces the time for removing the welding slag; B. Check the concentricity of the holes of the chain links described in step B on the leveling fixture; C. Clean and degrease the chain links that have passed the concentricity test using a finishing machine to make them bright.

5. The high-strength, corrosion-resistant welding chain and manufacturing process according to claim 1, characterized in that: The assembly and packaging steps of the chain are as follows: A. Connect the chain links in series through pins and then press the pins into strips through a mold. Install the locking pins after the strips are assembled and pack them for storage.

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