Do you want to know the general development of the non-developable surface of the tool cabinet sheet metal processing?

What is a tool cabinet? High-voltage power distribution rooms in electronics factories, coal mines and other factories will be equipped with tools for storing workers' work: insulating gloves, insulating boots, battery rods, safety belts and so on. First, it is for centralized storage and convenient use. The second is to prevent the tool cabinet from being damaged by moisture.

What is the sheet metal processing of tool cabinets? Sheet metal processing is a key technology that sheet metal technicians need to master, and it is also an important process of tool cabinet forming. The commonly used materials for sheet metal processing are cold-rolled sheet, hot-rolled sheet, galvanized sheet, copper brass, red copper and so on. Sheet metal processing includes traditional cutting, blanking, bending, stamping and other methods and process parameters, as well as various cold stamping die structures and process parameters, working principles and operation methods of various equipment, and new stamping technologies and processes.

Sheet metal processing has unfolded surface and non-unfolded surface. A few days ago, I talked about three methods of developing developable surfaces. Today we will discuss the approximate expansion of inextensible surfaces.

If the surface of a shape cannot be completely flattened on a plane without omission, overlap and wrinkle, then it is an unexpanded surface. According to their different formation mechanisms, they can be divided into two types: undevelopable rotating surface and ruled surface undevelopable surface. The undevelopable surface of revolution is a surface of revolution formed by generatrix (prime line) composed of curves rotating around a fixed axis. The spherical surface shown in Figure 2-7(a) and the paraboloid shown in Figure 2-7(b) belong to undevelopable surfaces of revolution. The generatrix forming the surface of revolution is also called longitude. The plane curve formed by the rotation of any point C on the bus AB with the bus is called the latitude of the revolution surface, and the circle formed by one revolution is called the weft circle, as shown in Figure 2-7 (c). A ruled undevelopable surface refers to a surface that can make at least one straight line when passing through any point on the surface. These straight lines are neither parallel nor intersecting (they will never intersect even if they extend), but they are in different plane states in space, such as the ruled conical surface as shown in Figure 2-7(d) and the ruled cylindrical surface as shown in Figure 2-7(e).

Non-expandable surfaces can be expanded approximately, although they cannot be expanded accurately. For example, a table tennis ball can tear its surface into many small pieces, then treat each small piece as a small plane, and then unfold these identified small planes on the same plane, so that the table tennis surface is approximately unfolded. According to the size and shape of the developed surface, the surface is divided into several parts according to certain rules, and then each small part is assumed to be a developable surface. Finally, each small developable surface is expanded one by one by using an appropriate expansion method, so that the approximate expansion diagram of the undevelopable surface is obtained.