Custom Stamping Die
The characteristics of custom stamping dies include mild high, high stiffness, mechanical automation, etc. It is widely used in the production of automobiles, energy, machinery, information, aerospace, defense industry, and daily life.
Precision Stamping Die
Precision stamping die has extremely high precision requirements, and there are specified technical requirements when designing die. The structural materials of stamping die play a crucial role in the durability, performance, and quality of custom stamping die. Technical personnel should be familiar with the carbide stamping die structure to manufacture precision stamping die that meet the standards.
Materials for Precision Stamping Die
There are many types of materials for precision stamping die, and their materials refer to the working parts of the die. During the stamping process, due to the gradually increasing temperature, the environment becomes very harsh, causing a series of friction, compression, and impact on the concave and convex die of the components. Due to environmental reasons, the die materials used must meet a series of requirements for manufacturing and process performance. The material of the stamping die mainly meets the following basic requirements:
Wear Resistance:The characteristic of material wear resistance will make the stamping die use longer, and wear resistance is closely related to the die. During the intense friction process, due to the high intensity of friction experienced by the die during manufacturing, good wear resistance can ensure the high quality and precision of the die.
Hardness:Under strong impact, the die has strong hardness, which can prevent deformation of the shape and size of the die. Hardness is one of the technical indicators of the die.
Resilience:Precision stamping die require complex processes such as pressure, bending, and deformation during the manufacturing process. So it has strong toughness and can prevent damage caused by partial breakage of the die. die have strong toughness, which helps reduce die damage and prolong usage time.
Adhesion Performance and Anti-biting Force:The die should have the characteristic of low adhesion, which is to prevent the metal being processed from adhering to the surface of the stamping die due to the mutual diffusion of two metal atoms. This situation will affect the use of the stamping die and also affect the quality of the workpiece. Each type of die has different working conditions, so corresponding performance should be carried out according to different requirements, which helps to achieve a high quality of the workpiece.
There are many types of materials for precision stamping die, and their properties also have various characteristics. Although each material has unique characteristics, no material can simultaneously meet multiple advantages, such as high strength, wear resistance, toughness, high hardness, etc.
When processing stamping die, attention should be paid to their performance, which is beneficial for achieving the requirements of stamping processing. For die structural components, such as fixed plates, high strength, and strong hardness should be met to prevent deformation of the workpiece.
The main materials of precision stamping die include carbon tool steel, low alloy tool steel, high-strength matrix steel, high-speed tool steel, etc.
Carbon tool steel is a commonly used material, which can be divided into high-quality carbon tool steel and high-grade high-quality carbon tool steel. This material will improve in hardness and wear resistance as the carbon content increases, but the disadvantage is that its toughness will decrease.
The Problems and Solutions of Deep Drawing Processing
Precision stamping die may encounter some problems during deep drawing technology. If technical personnel discover existing problems, they should promptly solve them to avoid affecting the quality of the product.
The problems that arise during the manufacturing of workpieces using deep drawing technology include the following:
1.Problems on the surface of precision stamping die, including impact lines, waves, scratches, etc.
2.The dimensional error of the workpiece is not within the specified range: the external dimensions of the workpiece are different from the design dimensions.
3.The shape of precision stamping die changes, mainly including shape distortion, surface pits, and warping deformation.
4.Uncontrollable compression, folding of sidewalls, and uneven changes in raw material can lead to wrinkling during deep drawing.
5.Deep drawing cracking: Cracking or bulging caused by wall strength, and rounded necking cracking caused by uneven deformation force.
Among the above issues, wrinkling has the greatest impact on the quality of deep-drawn parts, as the product wastes a lot of material. So it is necessary to take corresponding measures to avoid cracking and wrinkling during the deep drawing process.
The causes of cracks in deep drawing processing:The most common problem in deep drawing technology is deep drawing fracture. This problem is because when the tensile stress on the side wall of the workpiece is not within the strength range of the material, it leads to cracking at the position where the convex die corner of the workpiece is off-center. The pressing force and friction coefficient, the diameter and thickness of the burrs, the drawing coefficient, the radius of the convex and concave die corners, and the mechanical properties of the blank material will all have a certain impact on the strength of the sidewall. At the intersection of the rounded corners, excessive strain at the dangerous section leads to thinning of the wall thickness, which is the main cause of deep drawing fracture, as well as stress exceeding the strength limit of the sheet metal, resulting in cracking.
An effective method to avoid rupture.
1.Technicians should choose a drawing coefficient that meets the requirements. If the drawing coefficient is too large, it will increase the number of stretching times, reduce the stretching force, and the workpiece will become thicker. However, the drawing coefficient is too small, reducing the number of drawing times and increasing the degree of deformation increases the drawing force, causing the workpiece to become thinner.
2.Materials should be selected correctly, and the selection of workpiece materials should not only meet the workpiece standards but also meet the process requirements.
3.Due to the significant impact of convex and concave die fillet radius on sidewall cracking, design an appropriate convex and concave die fillet radius. Generally, large rounded corners are designed, which has the advantage of being less prone to cracking. If the rounded corners are small, it can cause deep drawing fractures.
4.Apply oil to the parts that require lubrication. To reduce friction, a reasonable lubrication method is generally adopted to achieve smooth material flow and avoid cracking. Oil must not be applied to the bulging area of the surface part, as applying it to the bulging area will result in oil pockets and pits.
The Processing Technology of Precision Stamping Dies
There are many types of processes for precision stamping die, and punching processing is one of them. Punching is a stamping process that uses a punching die on a press to separate the sheet metal. The stamping process includes punching, cropping, trimming, and cutting.
Design points in the manufacturing and production of stamping parts die
1.The Cutting Process Should Comply with the Design Standards. Single-sided cutting is the most commonly used cutting process, and it is difficult to ensure dimensional accuracy and geometric tolerances within the error range. Generally, the stamping process of falling material is used in the manufacturing of large deep deep-drawn parts.
2.Design High-quality Stamping Process Plans. The combination methods for designing stamping processes mainly include single-process punching, composite punching, and continuous punching. Because single-process punching is a punching die that only completes one stamping process in one stroke of the press, the efficiency is low. Continuous punching is a die that completes two or more punching processes simultaneously on different parts of the die. It has the advantage of high efficiency. In general, continuous punching is used on small-sized workpieces and workpieces with poor dimensional position, low accuracy, and no requirements for burr direction. Composite punching is a die that completes two or more processes at the same position in a stamping die, and the parts have the characteristics of high quality and high flatness accuracy.
3.Steps of Punching Technology. When technicians carry out punching, they should follow the correct punching steps. The holes on the workpiece, if their shape and size are not affected by subsequent process deformation, should be punched out on the flat blank. Holes that affect deformation can be completed in the forming process.
4.Choose a Reasonable Layout Method. The layout method and edge value can have a significant impact on the quality of the workpiece and material utilization. To improve the quality of the workpiece, the layout method should be strictly followed.
5.To Avoid Tilting.Technicians should distribute the punching force and stamping direction reasonably, and the punching force should be evenly distributed. The first step of the pressure plate is to press the material first, and then proceed with the punching process after pressing the material.
The problems that may occur during the punching process of precision stamping die and the measures taken.
The error in workpiece size is too large, mainly due to manufacturing errors in the working part of the convex and concave die, which cause the workpiece size to be inconsistent with the shape of other parts and the shape of the convex and concave die. Elastic changes occur during punching, resulting in deformation of the workpiece size. The measures taken are to ensure that the manufacturing dimensions of the working part of the convex and concave die conform to the process dimensions of the parts, and that the shape of the parts is consistent with that of the convex and concave die, eliminating elastic changes in the parts and achieving complete fit with the convex and concave die to reduce dimensional errors.
Related News
Applied’s expertise in modifying materials at atomic levels and on an ihdustrial scaleenables our customers to transform possibilities into reality.
