The Methods to Solve the Iron Filings of the Trimming Die
In the stamping production process of automobile covering parts, the scrap knife is usually used to cut the trimming waste in the mold. But the trimming cut also brings the small iron filings generated when the waste is cut into the mold cavity. And it results in indentation and other defects on the surface of the stamping parts. Such a process reduces production efficiency and also has a significant impact on the quality of surface parts. How to effectively solve the problem of removing iron filings from the trimming material is now the main problem.
Solutions for trimming iron filings
In the stamping production process of automobile covering parts, the scrap knife is usually used to cut the trimming waste in the mold. But the trimming cut also brings the small iron filings generated when the waste is cut into the mold cavity. And it results in indentation and other defects on the surface of the stamping parts. Such a process reduces production efficiency and also has a significant impact on the quality of surface parts. How to effectively solve the problem of removing iron filings from the trimming material is now the main problem.
1.Control the use of trimming scrap knife during mold design
(1) Avoid using scrap knives at the initial stage of mold design
In the mold design, when the process is arranged, the trimming can be arranged in sequence. So that it can avoid the use of scrap knives, thereby avoiding iron filings dropping from mold trimming. This method is suitable for molds with more processes.
(2) Secondary cutting method
If trimming cannot be arranged in sequence during mold design, the trimming secondary cutting method can be considered. The secondary cutting method is to cut the waste material for the second time in the lower part of the mold after the first trimming. So that it can avoid the iron filings generated by the waste material cutting. When working, the first trimming waste is cut by the first-class scrap knife into a large piece of waste. Then, the large piece of waste slides down to the baffle through the scrap slide. And the upper slide of the press moves up to the top dead center to complete the first trimming process. Next, the upper slider of the press performs a second stroke. It drives the secondary scrap knife upper die trimming insert to go down, cutting the first large piece of scrap into three small pieces of scrap and then sliding down to the waste pit. The grade scrap knife cuts the secondary trimming waste into a piece of large waste. This piece of large waste slides down to the baffle plate through the scrap slide when the upper slide of the press moves up. And the upper slide of the press moves up to the top dead center to complete the trimming process of the secondary piece, thus cyclic operation.
(3) Use a rotating scrap knife
The rotating scrap knife trimming method separates trimming from the slitting process. It fundamentally solves the generation of scrap iron filings. However, its structure is complex, the accuracy is high, and the length of the mold increases. So it greatly increases the cost of mold manufacturing and maintenance. Maintenance is more complicated. This method is suitable for the needs of high-speed automated production lines. And the production of surface parts with higher requirements for the state of surface parts is suitable for the production of surface covering parts for high-end car models.
2. Process control trimming iron filings
When the process is arranged, trimming cannot be performed, and a scrap knife needs to be set at this time. In this case, it is necessary to control the iron filings generated by the mold not to enter the surface of the part during production.
(1) Spatial sliding chip method
Compared with the sequential trimming mold, the mold of the spatial sliding chip method reduces the trimming mold and saves the cost. Moreover, the scrap knife has a simple structure and is widely applicable. On the production line with higher automation or higher frequency of production, more iron filings will block the gap of the scrap slide plate and cause the iron filings to enter the mold cavity. Therefore, this method is suitable for automated production lines with low production frequency or manual production lines. After a certain batch of parts are produced, the mold needs to be cleaned and maintained. However, this affects the production efficiency under certain circumstances, and it also poses risks to the safety of personnel and molds.
(2) Blowing and chip removal method
The air blowing method uses an air blowing device to remove the iron filings. The effect is more obvious than that of the spatial sliding chip method. But it slightly increases the cost of the air blowing device and the cost of compressed air. The manufacturing and use costs are high, and the maintenance is inconvenient. At the same time, sometimes the iron filings cannot be blown clean, and sometimes other small impurities are blown to cause the surface of the mold cavity to be contaminated. This method is suitable for automated production lines with higher production efficiency, and the production parts with higher requirements for surface conditions.
