Dongguan CNC factory wants to tell all colleagues that burr is an inevitable phenomenon in metal cutting for a long time. It directly affects the quality of products, and it should be controlled from the aspects of product structure design, process design, tool design and production management.
1. Introduction
Dongguan CNC factory wants to tell your colleagues that burr phenomenon has not attracted enough attention, so burr quietly affects the quality of products. For example, when designing a part of hydraulic system of excavator, the words "removing burr at the intersection of holes and joints" are written in the technical requirements, but some people question it for the reasons of difficult processing, inconvenient detection and increasing processing cost. Workers often ignore deburring process, and some designers don't pay much attention to it. They write "deburring" or "edge rounding" in the drawing. In fact, deburring is a very important process. In hydraulic system, once the burr on the part falls off and enters the component, it will jam the slide valve, damage the surface of the part, cut the hose or plug the outlet, etc., which will affect the performance of the main machine and even stop the machine. Burr will affect machining accuracy if it falls on the positioning reference plane; Burr can easily scratch workers and cause unsafe factors to affect assembly quality and part life. How to treat and control burr in metal cutting will directly affect the quality of products. Here is a point of view.
2. re understanding of burr
Burr refers to the irregular metal parts such as sharp corners and rough edges in the transition of workpiece surface due to the grain shear slip and plastic deformation under the action of cutting force during the cutting process of metal (including hot and cold machining). Dongguan CNC processing factory mainly refers to the burr problem in cold machining, namely metal cutting. Burr is one of the common phenomena in metal cutting, and it is also one of the two problems (burr generation and control, chip processing and control) which has not been solved yet in the theoretical research of metal cutting. It is known that metal cutting refers to the cutting method of cutting more than metal materials from the workpiece. Different cutting methods are selected with different tools (commonly used tools include turning tool, planer, drill bit, gear tool, etc., common cutting methods include turning, planing, drilling, grinding, milling, gear processing, etc.), although there are many different cutting methods, there are many different ways of cutting (such as movement during cutting The cutting tool and the essence of the cutting process have common rules. Different cutting methods are adopted, and the burr formation mechanism is not only the same, but also the shape of burr is different. So the burr has different influence on the quality of workpiece, and burr directly affects the dimension precision, shape and position precision and surface roughness of the workpiece.