Patent

Mechanical processing method for powder metallurgy to remove burrs

2019-06-03

In the powder metallurgy process, burrs are generated. After knowing the cause, we will find ways to remove the burrs. I remember that we have talked about the causes of burrs in powder metallurgy parts. Then, the technicians of Minxin Powder Metallurgy Factory will tell you about the mechanical processing methods for powder metallurgy to remove burrs.


1. Sandblasting deburring


Sand blasting is driven by compressed air to form a high-speed jet beam. The spray is sprayed at high speed onto the surface of the workpiece to be treated. The impact and cutting action of the abrasive on the surface of the workpiece is used to obtain a certain degree of cleanliness and different surface of the workpiece. Roughness to improve the mechanical properties of the workpiece surface. For example, the sandblasting of the arc-shaped bevel gear after quenching not only improves the surface finish, but also improves the surface fatigue resistance.


2, barreling deburring


The workpiece is rotated by a rotating brush, or the rotation of the brush and the workpiece is driven by a different motor. During the rolling process, the brush acts on the burr on the workpiece to cause the burr to fall off, thereby achieving the purpose of removing the burr. The method has a wide application range, and reasonable selection of parameters such as material and rotation speed of the brush can process workpieces with different precisions. It is mainly used for rotating parts and thin plates with simple structure, such as gears, cycloidal rotors, side plates, etc. The key technology is to get the best results under the load and the direction of the load.


3, thermal deburring


The principle is that the workpiece that needs to be deburred is placed in a sealed container with sufficient strength, and then a certain proportion of premixed combustible gas is sent, and the spark plug is ignited to generate an instantaneous high temperature to remove the burr on the surface of the workpiece. The method has high burr removal efficiency and good effect, does not affect the metallographic structure of the parts, and has wide application range, but the cost is relatively high, and is mainly applied to parts with complicated structure and high precision requirements.


4, light decoration to burr


The most widely used finishing machines are vibratory finishing machines and roller finishing machines, which have been widely used in the powder metallurgy industry. The vibratory finishing machine uses the vibration motor as the excitation source to generate the ternary vibration of the working cylinder, and the workpiece is closely mixed with the grinding stone or the steel ball and the abrasive. The workpiece and the grinding medium spiral with the high frequency vibration of the machine. Eddy-rolling to grind or polish the surface of the workpiece. Abrasive selection depends on the material, hardness, shape and surface roughness of the part. The drum finishing machine adopts a horizontal rotary drum. The barrel is divided into the inner lining and the inner barrel is covered with PU glue. It can resist acid and alkali, wear and prevent workpiece collision. The barrel is not covered with lining, which enhances the cutting force and makes the grinding effect more obvious. It is suitable for powder metallurgy quenching parts.


The above is about the mechanical processing method of powder metallurgy to remove burrs. At present, there are many methods for removing burrs from machined parts. The selection should be combined with the actual production of the factory, considering the material of the part, the size and location of the burr. Also consider the principle and economy of the burr removal method.


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