Improved process for bending of cold headed stainless steel clasp

Abstract

This invention relates to an improved method for the cold heading of stainless steel tie rods, comprising the following steps: S1, setting the number of main dies and punches according to the workpiece to be processed and the required processing steps; S2, after the workpiece is processed, performing an acid immersion process, with the acid concentration set in the range of 5% to 10% oxalic acid solution; S3, cleaning the finished workpiece and performing sandblasting treatment, with the sandblasting mesh set between 40 and 80 mesh; S4, performing surface treatment on the workpiece, with the surface treatment set as polishing, electrolysis, passivation, and sanding. This invention reduces tie rod resistance by first forming a chamfer; then pre-forming and placing it together with the tie rod; and finally forming the whole assembly. The tie rod is in the pre-forming stage, avoiding deformation under stress when the wire is suspended, and preventing bending deformation during tie rod formation. This avoids the problems of traditional tie rods being easily bent due to lack of support, and the rod being prone to roughening and machine collisions during forming.

Description

Technical Field

[0001] This invention relates to the field of cold heading forming mold technology, and in particular to an improved method for the cold heading of stainless steel bundled rods and bends. Background Technology

[0002] Strap brace nails are a special type of building and woodworking material commonly used to secure and join timber structures. These nails are designed to provide additional tensile and shear strength, increasing the stability and reliability of the connection.

[0003] In the existing technology, the profiles of the tie rod bends have the following two problems in the die stamping process:

[0004] When cold-forging rods, the rods are not supported, which makes them prone to bending and affects the yield rate.

[0005] During the forming process, the rod is prone to scratches, which can cause the rod to not exit the die smoothly and may lead to machine collisions.

[0006] There are also areas for improvement in the storage process of the finished bundled rod bent profiles:

[0007] Currently, before storing the tie rods, the bending studs need to be acid-soaked. However, this is usually done in a single acid-soaking process. A single acid-soaking process has poor timeliness. If the profiles are not used for five to ten days, the oxalic acid film on the surface will fail, the lubrication effect will be severely reduced, and subsequent processing will be inconvenient. Summary of the Invention

[0008] In view of the above-mentioned problems existing in the prior art, the main objective of the present invention is to provide an improved process method for cold heading of stainless steel bundles.

[0009] The technical solution of this invention is as follows: an improved method for the cold heading of stainless steel tie rods, comprising the following steps:

[0010] S1. Based on the workpiece to be processed and the steps required for processing, set the quantity of the main mold and the number of punches;

[0011] S2. After the workpiece is processed, it undergoes an acid immersion process. During this process, the acid concentration is set within the range of 5% to 10% oxalic acid solution.

[0012] S3. Clean the finished workpiece and perform sandblasting treatment on the workpiece. The sandblasting mesh size is set between 40 and 80 mesh.

[0013] S4. Perform surface treatment on the workpiece, which is set as four treatment methods: polishing, electrolysis, passivation and sanding.

[0014] Step S1 can be further refined as follows:

[0015] S11. The first mold is set as a chamfering mold. By pre-forming the chamfer, the resistance during the next process of binding the rod is reduced, the material deformation time during molding is slowed down, and the molding is more stable.

[0016] S12. The second mold is set as the pre-forming head and main mold tie rod mold, which uses a spring movable punch.

[0017] S13. The third mold is set as a shaping mold, used to refine the details of the tie rod bends and the surface roughness.

[0018] Step S2 can be further refined as follows:

[0019] S21. Soak in oxalic acid. Place the cold-forged and high-temperature bent rod into oxalic acid and shake it slightly to prevent thermal adhesion between parts.

[0020] S22. After the initial soaking, remove the bundled rods and bends, check for any hot-adhesive bundled rods and bends, pick them out, and lay them flat to air dry naturally.

[0021] S23. Soak the bundled rods and bends in oxalic acid again after they have been air-dried.

[0022] S24. Take out the bundle rod bend again, lay it flat and air dry it a second time. During the air drying process, shake the bundle rod bend repeatedly to ensure that the oxalic acid liquid on the outside of the workpiece can drip off quickly.

[0023] Step S3 can be further refined as follows:

[0024] S31. First, neutralize the acidity of oxalic acid with a mixture of sodium bicarbonate and water, and then clean the workpiece by rinsing or soaking with clean water.

[0025] S32. Select appropriate sandblasting materials, and choose suitable particle size and material according to different stainless steel types and the size of the tie rod bends.

[0026] S33. Perform sandblasting to clean the surface of the tie rod bend and completely remove oxalic acid residue from the surface of the tie rod bend.

[0027] Step S4 can be further refined as follows:

[0028] S41. Polishing treatment: The stainless steel surface is processed using mechanical equipment and abrasive materials to remove surface roughness, oxides and imperfections, making the surface smoother and brighter.

[0029] S42. Electrolytic treatment: The stainless steel tie rod is immersed in an electrolyte and polished on the anodic oxide layer generated on the stainless steel surface under the action of current to increase gloss and surface smoothness.

[0030] S43. Passivation treatment: A passivating agent is used to form an oxide film on the surface of stainless steel to increase its corrosion resistance and oxidation resistance.

[0031] S44. Sanding treatment: Abrasive materials such as sandpaper and grinding wheels are used to process the surface of stainless steel to form a uniform texture and sanding effect, which increases its texture and aesthetics.

[0032] In step S1, the main mold is used for extrusion molding, and the punch is ejected through reciprocating motion.

[0033] In step S1, the main mold and the punch die are connected by a mechanical arm to achieve lateral movement of the clamps, so as to realize material clamping and delivery. The product is transferred from the previous main mold to the next main mold through the clamps.

[0034] In step S1, the punch die is reciprocated by a motor or hydraulic cylinder.

[0035] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0036] 1. By first forming the chamfer, then preforming and placing it together with the tie rod, and finally forming the whole, this process can reduce the resistance of the tie rod. The tie rod is formed in the preforming stage, which avoids the deformation of the wire when it is suspended in the air. The tie rod will not bend or deform during the tie rod process, thus avoiding the problems of traditional tie rods and bend rods that are easy to bend without support and easy to scratch the rod part during the forming process, and easy to collide with the machine.

[0037] 2. By using a secondary oxalic acid process, the thickness of the oxalic acid film is increased, which significantly extends the adhesion time of the oxalic acid material on the surface of the bundle rod bend, improves the lubrication effect, delays the failure time of oxalic acid, and reduces the dependence of the wire on the storage environment. Attached Figure Description

[0038] Figure 1 This invention provides an improved method for the cold heading of stainless steel tie rods and bending nails, showing a schematic diagram of the connection structure between the main mold and the punch. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] Example

[0042] An improved method for the cold heading of stainless steel tie rods includes the following steps:

[0043] S1. Based on the workpiece to be processed and the steps required for processing, set the quantity of the main mold and the number of punches;

[0044] S11. The first mold is set as a chamfering mold. By pre-forming the chamfer, the resistance during the next process of binding the rod is reduced, the material deformation time during molding is slowed down, and the molding is more stable. The diameter of the bottom of the chamfer must be smaller than the diameter of the binding rod in the third mold. The chamfer angle is 15°.

[0045] S12. The second mold is set as the pre-forming head and main mold tie rod mold, which uses a spring-loaded movable die. The use of a spring-loaded movable die slows down the material deformation time during molding, making the molding process more stable. Furthermore, all materials are supported by the mold cavity, eliminating the risk of material bending during tie rod formation.

[0046] S13. The third mold is set as a shaping mold, which is used to refine the details and surface roughness of the tie rod bend. With this setting, the details and roughness of the tie rod bend can achieve the preset effect.

[0047] Through the above steps, the pre-forming chamfering process reduces the resistance of the bundle rod, so that the bundle rod in the pre-forming stage can avoid deformation under stress when the wire is suspended, and the bundle rod will not bend or deform during the process.

[0048] S2. After the workpiece is processed, it undergoes an acid immersion process. During this process, the acid concentration is set within the range of 5% to 10% oxalic acid solution.

[0049] S21. Soak in oxalic acid. Place the cold-forged and high-temperature bundled rods into oxalic acid and shake them slightly to prevent thermal adhesion between the parts. During this step, the bundled rods can be placed arbitrarily, and the parts can be dispersed by shaking.

[0050] S22. After the initial soaking, take out the bundled rods and bends, check for any bundled rods and bends that are stuck together with heat, pick them out, lay them flat and let them air dry naturally, remove the bundled rods and bends that are stuck together, weigh them, and compare them with the yield rate to obtain the yield probability.

[0051] S23. Soak in oxalic acid again. After air-drying, the bundled rods and bends are soaked in acid again. During the second soaking, the bundled rods and bends should be placed vertically on a rack. The advantage of this setup is that it does not affect the soaking effect and can increase the air-drying speed.

[0052] S24. Take out the bundled rod bends again, lay them flat and air dry them a second time. During the air drying process, shake the bundled rod bends repeatedly to ensure that the oxalic acid solution on the outside of the workpiece can drip off quickly. This setting allows the bundled rod bends that have been acid-soaked a second time to air dry quickly.

[0053] In the above steps, the secondary oxalic acid process greatly delays the oxalic acid deterioration time and reduces the wire's dependence on the storage environment.

[0054] S3. Clean the finished workpiece and perform sandblasting treatment on the workpiece. The sandblasting mesh size is set between 40 and 80 mesh.

[0055] S31. First, neutralize the acidity of oxalic acid with a mixture of sodium bicarbonate and water. Then, clean the workpiece by rinsing or soaking with water. The neutralization of oxalic acid only needs to be done once, while rinsing with water needs to be done at least three times.

[0056] S32. Select appropriate sandblasting materials, and choose suitable particle size and material according to different stainless steel models and the size of the tie rod bends. Through the above settings, the tie rod bends can achieve a more ideal sandblasting effect.

[0057] S33. Perform sandblasting to clean the surface of the tie rod bend and completely remove oxalic acid residue. Sandblasting not only facilitates subsequent processing but also completely removes trace amounts of residual oxalic acid.

[0058] Sandblasting not only cleans oxalic acid and facilitates subsequent processing, but it can also completely remove trace amounts of residual oxalic acid.

[0059] S4. Perform surface treatment on the workpiece, which is set as four treatment methods: polishing, electrolysis, passivation and sanding.

[0060] S41. Polishing: The stainless steel surface is processed using mechanical equipment and abrasive materials to remove surface roughness, oxides and imperfections, making it smoother and shinier. This process enhances the appearance of stainless steel and makes it easier to clean.

[0061] S42. Electrolytic treatment: The stainless steel tie rod is immersed in an electrolyte. Under the action of current, the anodic oxide layer generated on the stainless steel surface is polished to increase the gloss and surface smoothness. This setting can make the stainless steel surface have higher brightness and texture.

[0062] S43. Passivation treatment: A passivating agent is used to form an oxide film on the surface of stainless steel to increase its corrosion resistance and oxidation resistance. This setting can provide an additional protective layer, making stainless steel tie rods more corrosion resistant in harsh environments.

[0063] S44. Abrasive treatment: Abrasive materials such as sandpaper and grinding wheels are used to process the surface of stainless steel to form a uniform texture and abrasive effect, which increases its texture and aesthetics. Abrasive treatment can be used in some products with poor surface roughness but still usable. Abrasive treatment can improve the smoothness of the surface of the tie rod bend and remove surface oxides and contaminants, thus improving the cleanliness of stainless steel.

[0064] Surface treatment can improve the surface finish of the tie rod bends, making them suitable for use in different scenarios.

[0065] In step S1, the main mold is used for extrusion molding, and the punch is ejected through reciprocating motion, such as... Figure 1 As shown, the corresponding main mold is used in conjunction with the corresponding punching die.

[0066] In step S1, the main mold and the punch die are connected by a mechanical arm to achieve lateral movement of the clamps to deliver materials. The products are transferred from the previous main mold to the next main mold through the clamps. This setup is mainly used to transfer the bundled rods and bends during the processing.

[0067] In step S1, the die reciprocates via a motor or hydraulic cylinder, thus providing the necessary power for its movement.

[0068] Working principle:

[0069] This invention reduces the resistance of the bundle rod by first forming the chamfer, then preforming and placing it together with the bundle rod, and finally forming the whole. The bundle rod is in the pre-forming stage, which avoids the deformation of the wire when it is suspended in the air. The bundle rod will not bend or deform during the binding process, thus avoiding the problems of traditional bundle rods and bend rods that are easy to bend without support and easy to scratch and collide with the machine during the forming process.

[0070] By using a secondary oxalic acid process to increase the thickness of the oxalic acid film, the adhesion time of the oxalic acid material on the surface of the bundle rod bend can be significantly extended, thereby improving the lubrication effect, delaying the failure time of oxalic acid, and reducing the dependence of the wire on the storage environment.

[0071] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An improved method for the cold heading of stainless steel tie rods, characterized in that, Includes the following steps: S1. Based on the workpiece to be processed and the steps required for processing, set the quantity of the main mold and the number of punches; S2. After the workpiece is processed, it undergoes an acid immersion process. During this process, the acid concentration is set within the range of 5% to 10% oxalic acid solution. S3. Clean the finished workpiece and perform sandblasting treatment on the workpiece. The sandblasting mesh size is set between 40 and 80 mesh. S4. Perform surface treatment on the workpiece, which is set as four treatment methods: polishing, electrolysis, passivation and sanding. Step S1 can be further refined as follows: S11. The first mold is set as a chamfering mold. By pre-forming the chamfer, the resistance during the next process of binding the rod is reduced, the material deformation time during molding is slowed down, and the molding is more stable. S12. The second mold is set as the pre-forming head and main mold tie rod mold, which uses a spring movable punch. S13. The third mold is set as a shaping mold, used to refine the details of the tie rod bend and the surface roughness; Step S2 can be further refined as follows: S21. Soak in oxalic acid. Place the cold-forged and high-temperature bent rod into oxalic acid and shake it slightly to prevent thermal adhesion between parts. S22. After the initial soaking, remove the bundled rods and bends, check for any hot-adhesive bundled rods and bends, pick them out, and lay them flat to air dry naturally. S23. Soak the bundled rods and bends in oxalic acid again after they have been air-dried. S24. Take out the bundle rod bend again, lay it flat and air dry it a second time. During the air drying process, shake the bundle rod bend repeatedly to ensure that the oxalic acid liquid on the outside of the workpiece can drip off quickly. Step S3 can be further refined as follows: S31. First, neutralize the acidity of oxalic acid with a mixture of sodium bicarbonate and water, and then clean the workpiece by rinsing or soaking with clean water. S32. Select appropriate sandblasting materials, and choose suitable particle size and material according to different stainless steel types and the size of the tie rod bends. S33. Perform sandblasting to clean the surface of the tie rod bend and completely remove oxalic acid residue from the surface of the tie rod bend. Step S4 can be further refined as follows: S41. Polishing treatment: The stainless steel surface is processed using mechanical equipment and abrasive materials to remove surface roughness, oxides and imperfections, making the surface smoother and brighter. S42. Electrolytic treatment: The stainless steel tie rod is immersed in an electrolyte and polished on the anodic oxide layer generated on the stainless steel surface under the action of current to increase gloss and surface smoothness. S43. Passivation treatment: A passivating agent is used to form an oxide film on the surface of stainless steel to increase its corrosion resistance and oxidation resistance. S44. Sanding treatment: Abrasive materials such as sandpaper and grinding wheels are used to process the surface of stainless steel to form a uniform texture and sanding effect, which increases its texture and aesthetics. By first forming the chamfer, then preforming and placing the bundled rod together, and finally forming the whole, this process can reduce the resistance of the bundled rod. The bundled rod is formed in the preforming stage, which avoids the deformation of the wire when it is suspended in the air. The bundled rod will not bend or deform during the process, thus avoiding the problems of traditional bundled rods and bends that are easy to bend without support and easy to scratch and hit the machine during the forming process. By using a secondary oxalic acid process to increase the thickness of the oxalic acid film, the adhesion time of the oxalic acid material on the surface of the bundle rod bend can be significantly extended, thereby improving the lubrication effect, delaying the failure time of oxalic acid, and reducing the dependence of the wire on the storage environment.

2. An improved method for the stainless steel cold heading bracing bending process according to claim 1, characterized in that: The main mold in step S1 is used for extrusion molding, and the punch is ejected through reciprocating motion.

3. An improved method for the stainless steel cold heading brace bending process according to claim 1, characterized in that: In step S1, the main mold and the punch die are connected by a mechanical arm to achieve lateral movement of the clamps, so as to realize material feeding. The product is transferred from the previous main mold to the next main mold through the clamps.

4. An improved method for the stainless steel cold heading brace bending process according to claim 1, characterized in that: The die in step S1 is reciprocated by a motor or hydraulic cylinder.

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