What Is Superfinishing?

Finishing of the finished surface with fine-grained whetstone mounted on the vibrating head (see Cutting). Superfinishing is generally arranged after the finishing process, and its machining allowance is only a few microns, which is suitable for machining the outer circle, inner circle, plane, channel surface and spherical surface of crankshafts, rolls, bearing rings and various precision parts.

Ultra-precision machining is a machining process that uses ultra-precision machine tools and equipment to make micro-cuts on materials by using the relatively restricted relative movement between parts and tools to obtain extremely high shape accuracy and surface finish. Its accuracy ranges from micron to sub-micron and even nanometer. Its application range is becoming wider and wider, and it is widely used in high-tech fields, military industry and civil industry, especially in the field of electrical automation, such as ultra-large scale integrated circuits, high-precision magnetic disks, precision Radars, missile fire control systems, precision machine tools, precision instruments, video recorder heads, photocopier drums, gas stove rotary valves, etc. must all use ultra-precision processing technology. It is closely related to the development of some major contemporary science and technology, and is an important link in the development of contemporary science. Moreover, the development of ultra-precision machining technology has also promoted mechanical, hydraulic, electronic, semiconductor, optics, sensor and measurement technology, and materials science. Development ^[1]

Ultra-finishing is an abrasive precision machining method that uses micro-grinding whetstone mounted on the vibrating head to micro-cut the workpiece.

Super finishing is mainly to reduce the Ra value, which can reach 0.2 0.012m, which can improve the shape accuracy appropriately.

Super-finishing productivity is very high, and it is often used to process the outer circle, inner circle, plane, channel surface and spherical surface of crankshafts, rolls, bearing rings and certain precision parts.

According to the mechanism and characteristics of processing methods, ultra-precision processing methods remove processing, combining processing and deformation processing.

1. Remove processing. Also known as separation processing, is the removal of a part of the material from the workpiece. It is a traditional mechanical processing method, such as turning, milling, grinding, grinding and polishing, as well as EDM and electrolytic processing in special processing. Kind of processing method.

2. Combine processing. Use physical and chemical methods to combine different materials. According to the combination of mechanism, method, strength, etc., it is divided into three types: attachment, injection and connection.

3. Deformation processing. Also known as flow processing, the use of force, heat, molecular motion and other means is the deformation of the workpiece, changing its size, shape and performance.

The picture shows the method of superfinishing the outer circle. Under sufficient cooling and lubrication conditions, the fine-grained whetstone mounted on the vibrating head is pressed

The ultra-finishing process can be divided into 4 stages:

Compared with grinding, super-finishing can improve the surface roughness of the workpiece from R 0.63 to 0.16 microns to R 0.08 to 0.01 microns in a few seconds to tens of seconds, and can effectively remove the grinding Defects such as vibration marks, corrugations, spirals, etc., as well as peaks and metamorphic layers that are prone to wear, greatly improve the service life of the workpiece. The abrasive grain size of oilstone commonly used in ultra-finishing is W0.5 W28, the finer the particle size, the smoother the surface; the commonly used cutting fluid is about 80% kerosene plus about 20% motor oil, and is strictly filtered.