Hey there! As a supplier of CNC stamping parts, I've seen my fair share of common defects in the industry. In this blog, I'm gonna share some of these issues and how we can solve them.
1. Surface Scratches
One of the most common defects we encounter in CNC stamping parts is surface scratches. These can happen for a bunch of reasons. First off, the stamping die might have some rough spots or debris on it. When the material passes through the die during the stamping process, these rough areas can scrape against the surface of the part, leaving scratches.
Another cause could be the handling of the parts after stamping. If they're not handled carefully, they can rub against other objects or each other, causing scratches. Even the conveyor belts or storage racks used in the factory can sometimes have rough surfaces that scratch the parts.
So, how do we solve this problem? Well, for the stamping die, regular maintenance is key. We need to clean the die frequently to remove any debris or build - up. Also, we can polish the die surfaces to make them smoother. This reduces the chances of scratches during the stamping process.
When it comes to handling the parts, we should use soft - lined tools and containers. For example, we can use rubber - coated tongs to pick up the parts instead of metal ones. And when storing the parts, we can use foam - lined racks to prevent them from scratching against each other.
2. Burrs
Burrs are another common defect in CNC stamping parts. Burrs are small, unwanted pieces of metal that stick out from the edges of the stamped part. They're usually caused by the shearing action during the stamping process. If the stamping die is not sharp enough or if the clearance between the punch and the die is not set correctly, burrs are likely to form.
To solve the burr problem, we need to ensure that the stamping die is sharp. We can regularly sharpen the cutting edges of the die. Also, we should carefully adjust the clearance between the punch and the die. If the clearance is too large, burrs will be more likely to form. But if it's too small, the die might wear out faster. So, finding the right balance is crucial.
After the stamping process, we can use deburring techniques to remove the burrs. There are several methods available, such as manual deburring using files or abrasive pads, and mechanical deburring using tumbling machines.
3. Dimensional Inaccuracies
Dimensional inaccuracies are a big headache in the CNC stamping parts industry. This means that the actual dimensions of the stamped part don't match the design specifications. There are many factors that can cause dimensional inaccuracies.
One factor is the thermal expansion and contraction of the material during the stamping process. When the metal is heated up during stamping (due to friction), it expands. And when it cools down, it contracts. This can lead to changes in the dimensions of the part.
Another factor is the wear and tear of the stamping die. As the die is used over and over again, its dimensions can change slightly. This can result in parts that are either too big or too small.
To solve the problem of dimensional inaccuracies, we need to control the temperature during the stamping process. We can use cooling systems to keep the material at a stable temperature. This reduces the effects of thermal expansion and contraction.
We also need to regularly inspect and maintain the stamping die. If we notice any signs of wear, we should repair or replace the die as soon as possible. Additionally, we can use precision measuring tools to check the dimensions of the parts during the production process. If we find any parts that are out of spec, we can adjust the stamping process accordingly.
4. Cracks
Cracks in CNC stamping parts are a serious defect. They can weaken the part and make it unusable. Cracks can be caused by several factors, such as excessive stress during the stamping process, poor material quality, or improper heat treatment.
If the stamping force is too high, it can put too much stress on the material, causing it to crack. Also, if the material has internal defects or impurities, it's more likely to crack during stamping. And if the heat treatment process is not done correctly, the material's structure can be weakened, leading to cracks.
To prevent cracks, we need to optimize the stamping process parameters. We should carefully calculate the stamping force and make sure it's within the acceptable range for the material. We also need to use high - quality materials. Before using a batch of material, we should conduct quality inspections to ensure that it's free of defects.
Proper heat treatment is also essential. We need to follow the correct heat treatment procedures for the specific material. This can improve the material's strength and toughness, reducing the chances of cracking.
5. Wrinkles
Wrinkles are often seen in stamped parts, especially those made from thin materials. Wrinkles are caused by the uneven distribution of stress during the stamping process. When the material is being deformed, if the stress is not evenly distributed, some areas of the material can bunch up, forming wrinkles.
To solve the wrinkle problem, we can use blank holders. Blank holders apply pressure to the material around the edges during stamping. This helps to keep the material flat and reduces the chances of wrinkles forming.
We can also optimize the stamping process sequence. By carefully planning the order in which different parts of the material are deformed, we can ensure a more even distribution of stress.
Related Services
If you're interested in learning more about the stamping process, we offer Aluminum Stamping Machining services. We also have a wide range of Aluminum Stamping Parts available. And for more general information, check out our Machining Stamping page.
In conclusion, dealing with the common defects in CNC stamping parts requires a combination of proper die maintenance, process optimization, and quality control. As a supplier, we're constantly working to improve our processes to ensure that we deliver high - quality stamping parts to our customers.
If you're in the market for CNC stamping parts, don't hesitate to reach out to us. We're more than happy to discuss your specific requirements and provide you with the best solutions.
References
- "Metal Stamping Handbook"
- Industry reports on CNC stamping part manufacturing