Patent

Deburring type and hazard

2019-06-03

Deburring type and hazardous mechanical parts processing methods can be roughly divided into material processing, deformation processing, and additional processing. In various processes, the excess portion derived from the machined part that does not conform to the required shape and size is a burr. The production of burrs varies with the processing method. According to the different processing methods, the burrs can be roughly divided into:


Cast burr: Excess material produced at the joint of the mold or at the root of the gate. The size of the burr is generally expressed in millimeters.


Forged burr: at the joint of the metal mold, due to the plastic deformation of the forging material. Electric welding, gas welding burr: welding burr, is the filler at the weld protruding from the surface of the burr on the part; gas welding burr, is the slag overflowing from the slit when the gas cuts.


Stamping burr: When punching, there is a gap between the punch on the die and the die, or there is a gap between the cutters at the slit, and burrs are caused by the wear of the die. The shape of the punch burr varies depending on the material of the plate, the thickness of the plate, the gap between the upper and lower dies, the shape of the stamped part, and the like.


Machining burrs: machining methods such as turning, milling, planing, grinding, drilling, and reaming can also produce burrs. The burrs produced by various processing methods vary in shape depending on the tool and process parameters. Plastic forming burrs: As with casting burrs, burrs are produced at the joints of plastic molds.


Due to the presence of burrs, the entire mechanical system will not work properly, resulting in reduced reliability and stability. When a machine with burrs is mechanically moved or vibrated, the burrs that are detached may cause premature wear and noise of the sliding surface of the machine, and even cause the mechanism to become stuck and malfunction. Some electrical systems may be burred when moving with the main engine. If the system is short-circuited or the magnetic field is damaged, it will affect the normal operation of the system. For hydraulic system components, if the burr falls off, the burr will exist in the tiny working gap of each hydraulic component, causing the spool to become stuck and the circuit or filter to be blocked. The accident can also cause fluid turbulence or laminar flow, reducing the performance of the system. Japanese hydraulic experts believe that 70% of the causes affecting the performance and life of hydraulic components are caused by burrs; for transformers, the core with burrs increases the iron loss of iron core by 20 to 90%, and increases with frequency. . The existence of burrs also affects the assembly quality of the mechanical system, affects the processing quality of the subsequent processing steps of the parts and the accuracy of the test results.


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