Custom Stamping Die
Custom stamping die has the characteristics of high strength, corrosion resistance, and wear resistance. The materials mainly include tool steel, hard alloy, stainless steel, and tungsten containing steel. The workpiece has high quality, high precision, and high production efficiency.
Solutions for Stamping Molds
There are many solutions for stamping molds, and precision custom stamping die has corresponding solutions for different problems. Various stamping molds can be made using a punching machine, and the workpiece has the characteristic of high efficiency, and their applications are becoming increasingly widespread.
Stamped Engine Hood Molds
- Stamping Mold Working Process
First, place the outer flipping plate into the concave mold through the positioning plate, and then place the inner plate into the outer flipping workpiece. The upper mold will guide the guide pin of the pressure plate into the positioning hole of the inner plate as the sliding block of the stamping die equipment descends, and continue to lower the driver to contact the parallel connecting rod mechanism. The pre-pressing convex mold on the cutter seat of the parallel connecting rod mechanism pushes the outer flipping plate to about 45 °, and the driver continues to lower. The pre-pressing convex mold on the parallel connecting rod mechanism returns, and the upper mold convex mold descends into contact with the pre-pressing convex mold. Push it to 45 °to flatten the outer plate, and the inner plate is wrapped inside to Complete the pressing process of metal stamping die.
- Debugging Solutions for Stamping Molds
1.Check whether the design of the stamping mold for the outer panel is qualified. After pressing, some parts of the assembly may change, such as larger gaps in some areas and smaller gaps in others.
2.The flanging height of the outer plate of the stamping mold has a significant impact, especially on the high flanging of the corners of the engine hood outer plate, which leads to material accumulation. The flanging mold for the small outer plate cannot be pushed over.
3.The taper of the guide pin of the pressure plate does not meet the requirements, and it is easy to deform the positioning hole of the inner plate when entering it.
4.Because the pressing plate only has the basic pressing surface pressing the outer plate, some parts of the outer plate may experience warping deformation after the pre-pressing convex mold works, which affects product quality.
- Specific Solutions for Stamping Molds
1.Change the taper of the guide pin to solve the problem of deformation of the inner plate positioning hole. Due to the error in the machining hole position of the guide pin on the pressure plate, and the relative position of the outer and inner plates is adjusted through the guide pin, if the designed guide pin has a small taper, once the position of the guide pin in the stamping mold is adjusted to have a slight deviation, the positioning hole on the inner plate will deform. If the taper of the guide pin is lengthened and the guide pin is naturally aligned, the problem of deformation of the positioning hole on the inner plate can be solved.
2.Solve the problem of easy stacking of materials in the engine hood pressing mold after corner pressing and extrusion. The corners are circular surfaces, and the pre-pressing convex mold pushes down the corners of the flipped outer plate to produce aggregates, which are stacked together. When there are too many materials, they are squeezed outward, causing deformation of the corners and affecting product quality. A reasonable height is helpful for processing. As the stacking material is formed by stamping the curved surface into the engine hood mold, the positioning position of the pressing mold is pushed down by the convex mold when flipping the outer plate, changing the flipping height alone cannot effectively solve the problem of angle extrusion. At this time, the angle of the stacking material can be lowered corresponding to the convex surface of the upper mold, so that the stacking area is no longer subjected to force when the convex mold is pressed down, which can improve the problem of corner stacking material extrusion.
3.Change the angle of the pre-pressed convex model surface to solve the problem of increasing the gap between the pressed parts. During the debugging process, it was found that the single product inspection of the engine hood outer panel was qualified, and the gap increased after pressing. This is due to frequent contact between the lower part of the pre-pressed convex model surface and the outer panel. The angle of the pre-pressed convex model surface can be changed to prevent contact between its lower part and the outer plate flange, which solves the problem of increasing the gap between the pressed parts when a single product is qualified.
4.Change the structure of the inlay block to solve the problem of warping and deformation of the outer plate. If the pressing plate of the stamping equipment has only a few pressing surfaces and the deformed areas are not pressed, the outer plate of the engine hood near the water channel will experience warping deformation. By raising the surface of the upper mold convex mold insert corresponding to the deformation, and allowing the convex mold to be pressed down, the problem of warping deformation is completely solved by pre-pressing the warped area once again.
Measures for Distortion of Deep Drawing Stamping Molds
- Cause Analysis
The rebound of stamping molds can cause significant errors in the accuracy of the parts. Rebound is a complex issue that is difficult to solve, such as poor positioning caused by rebound, lack of precision in edge trimming, out-of-tolerance boundary dimensions, and surface distortion. The main reason for spring back is the elastic deformation of the sheet metal. Even if the sheet metal has undergone the most sufficient plastic deformation, the elastic characteristics of the material still exist. In other words, the maximum elastic deformation of the workpiece is certain, and the part beyond the elastic limit will produce a plastic deformation process. However, regardless of the plastic deformation, the amount of spring back will not change.
There are many forms of rebound, and distortion is a manifestation of rebound, mainly caused by uneven rebound amount or stress-strain. The basic method to prevent rebound is to make the deep drawing sufficient, generate sufficient plastic deformation, and try to make the feeding uniform everywhere. However, this is only theoretical, and in actual debugging, it is difficult to meet this requirement due to the limitations of product design. The commonly used method is to lower and deform the surface, locally raise the surface, and change the angle of the flange. For example, when flipping a right-angled edge, it is impossible to use a vertical flipping method without rebound. Reducing the gap to increase lateral force can lead to many problems such as workpiece burrs, decreased mold stiffness, and strength.
- Solutions for Stamping Molds
In the debugging of stamping molds, due to the influence of process accuracy, some problems may be encountered, which can affect the debugging work. Before debugging, it is necessary to carefully read and understand the analysis report of the stamping mold to know the feeding situation of each part of the stamping mold, as well as the stress situation of the stamping mold in each stage of deep drawing. Technical personnel should master the skills proficiently and use different solutions to solve the problem of workpiece distortion. For the problem of distortion in stamping molds, foreign experts use the adjustment of the positioning pin position and then calculate the feed size of the two sides of the sheet metal based on the flow traces of the sheet metal on the pressing ring during deep drawing. When they are equal, the workpiece is considered to be in an ideal state.
When debugging, use a scribe to draw the centerline on the convex mold of the precision deep drawing and stamping mold according to the center, install the positioning pin according to the initial position, raise the lower pressing ring to the correct height, and place the sheet metal on the pressing ring according to the positioning pin position, corresponding to the centerline of the convex mold, and draw the corresponding centerline on the sheet metal. Next, try to punch out the part, place the stamping mold on the convex mold, and drop the pressing ring. Corresponding to the centerline between the convex mold and it, the direction of the part’s distortion and deviation can be observed.
Then, ensure that the stamping mold does not deform by adjusting the height of the drawing ribs on both sides and the size of the fillet radius, and also control the feeding speed of the material. The amount of feeding on both sides of the sheet metal is closely related to the feeding speed on both sides. This ensures that the feeding speed is as uniform as possible and that the sheet metal of the stamping mold is evenly fed on both sides in the deep drawing state so that the drawing force on both sides reaches a balanced state. The stamping mold will not twist, and the parts will be designed to be in an ideal state to achieve qualified loading.
Solutions for Stamping Molds
There are three main factors in the design and process technology of precision stamping molds.
- Reasons and Solutions in Stamping Mold Design:Choose materials with high strength, as the strength and stiffness of the punch are low. The selected material is alloy steel, which is beneficial for increasing the strength of the punch edge; Choose a punch for thick sheet metal, and the bottom steps of the punch should be selected according to the standard design requirements for thicker steps.
By breaking small holes and punching them on the mold surface, it is beneficial to increase the guiding accuracy of the pressing plate and the convex mold, achieving the requirements of the guiding of the pressing plate and the shape of the parts being the same as the stamping molds surfaces. To ensure no breakage and reduce lateral force.
The layout of the punching punch is uneven relative to the stamping center, which cannot ensure force balance, especially when stamping thick plates, resulting in breakage. Technicians should design to ensure that the resultant force of the punching hole coincides with the center of the punching pressure as much as possible.
- Reasons and Solutions for Stamping Mold Manufacturing:There are errors in the design and manufacturing of the convex mold, resulting in large mold gaps that do not meet uniform standards. When punching, it is subjected to lateral pressure and may break. Therefore, the manufacturing accuracy of the punching punch plays an important role in preventing the punching punch from breaking.
The heat treatment technology of punching punch is very important and has a significant impact on the service life of the punch. The temperature and time of high-temperature tempering after quenching, as well as the thickness of the hardened layer, are also important.
The surface roughness, tool marks, and angular lines of the convex mold during machining can cause local stress concentration and fracture of the convex mold.
- Solutions for Stamping Molds and Breakage:When punching small holes, the pressing surface around the convex mold should not be too small, otherwise it will cause displacement and extrusion problems. Punching waste should not be trapped or returned in the concave mold to avoid causing hard fracture of the convex mold due to impact.
In the manufacturing of stamping mold technology, the parts are not reliably positioned, and the pressing and returning of materials do not meet the requirements, resulting in the breakage of the punching punch. To meet the process requirements, sensors are used to control the position of the workpiece.
The guide deviation of the stamping molds requires the press to be vertical, otherwise it will cause the punching punch to break due to significant lateral force. The guide clearance of the press should be within the standard range, and the guide mechanism of the stamping molds should be adjusted to reduce the lateral force of the punch.
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