Label：Sheet Metal, Structure Optimization, Rivet Interference, Assembly Clearance
Nov 1, 202111522
Engineers are a group of people who are indispensable in sheet metal processing. They play a vital role in the smooth manufacturing process of sheet metal parts.
In addition to product quotation, sheet metal disassembly drawings, and workshop production, there is another task that requires engineers to concentrate on completing the work, that is: sheet metal structure optimization.
Today we use an example to introduce the necessity of "optimization of sheet metal structure" in depth.
As shown in Figure 1, this is a sheet metal part that can be divided into an upper cover, a lower shell, and an internal bracket.
Since users do not fully understand sheet metal processing technology, sheet metal workshop equipment, etc., there are often some problems in the drawings. At this time, the engineer needs to play the role of "escort": discover the problems in the sheet metal design drawings provided by the user, and optimize the drawing in combination with the sheet metal processing technology to ensure that the sheet metal can meet the user's function and appearance requirements.
Since this product needs to be sprayed, after the actual production, the upper and lower covers cannot be installed because there is no reserved assembly clearance.
We expand the size of the upper cover to leave a certain assembly clearance between the upper cover and the lower shell, as shown in Figure 3 below.
Generally speaking, the clearance will be reserved to about 0.4~0.6mm. The main reason is that the thickness of the general sprayed plastic powder layer is about 0.15~0.25mm. In addition, through the analysis of the product, we generally do not modify the lower shell, because the lower shell is the most important part of the product, and random changes may involve the size of its internal installation accessories. Therefore, it is more reasonable for us to choose to modify the upper cover.
As shown in Figure 4, the two nuts in the red circle are actually restricted by the mold of the riveting machine during processing, and the riveting operation cannot be carried out. These two nut will interfere with the product flanging during pressure riveting. Please refer to Figure 5-pressure riveting interference simulation.
We punch holes at the flanging position of the actual interference corresponding to the nut column where the pressure riveting interferes, so as to avoid the pressure riveting machine, as shown in Figure 6 below.
Through the way of punching avoidance hole, according to the simulation state of the riveting machine, the process of riveting can be realized.
Due to the limited length of the article, JRPanel only lists 2 common problems. Welcome everyone to place orders at JRPanel and experience the professional and efficient service of our engineers.