Grinding technique for aluminum alloy drum of external-drum type plate-making machine

Abstract

The invention relates to grinding technique for an aluminum alloy drum of an external-drum type plate-making machine. The technical problem needed to be solved is as follows: the provided technique can effectively process the drum of the plate-making machine, and have the characteristics of high processing precision, good quality, high working efficiency and convenient processing. The technical scheme is that the grinding technique for the aluminum alloy drum of the external-drum type plate-making machine is implemented in sequence according to the following steps of: 1) implementing conventional metal machinery processing to basically shape the profile of the drum; 2) implementing the cleaning processing of the surface of the drum and pre-processing of anodic oxidation; 3) implementing the processing of hard anodic oxidation on the surface of the drum to lead the thickness of a hard oxidation layer to achieve 0.03-0.05mm and lead the rigidity to achieve HV390-410; and 4) grinding until the requirements are met. Rough turning, high temperature aging, semi-fine turning, middle temperature aging, assembling and milling, low temperature aging and fine turning are implemented in the step 1) in sequence; and the surface cleaning processing in the step 2) refers to the processing of degreasing and oil removing.

Description

technical field [0001] The invention relates to a processing technology of CTP equipment components, in particular to a grinding processing technology of an aluminum alloy light drum of an external drum type plate making machine. Background technique [0002] In CTP (computer to plate) equipment, the light drum of the plate making machine is usually made of aluminum alloy; the precision of the light drum is high, and the cylindricity should be within 0.01mm, such as the diameter of the light drum is 343.5mm, and the length is 1195mm. The optical drum also requires that the cylindricity should be within 0.01mm, which is difficult to process for the characteristics of aluminum alloy; the reasons are: [0003] 1. Low hardness and strength: the highest hardness of aluminum alloy is HB110-120, and the maximum tensile strength is generally 20-30kg / cm 2 . Due to the low hardness, the material has poor ability to resist plastic deformation or scratches, and it is easy to scratch a...

AI Technical Summary

Problems solved by technology

[0003] 1. Low hardness and strength: the highest hardness of aluminum alloy is HB110-120, and the maximum tensile strength is generally 20-30kg / cm 2

Due to the low hardness, the ability of the material to resist plastic deformation or scratches is poor, and it is easy to scratch and bruise the surface of the workpiece during grinding.

[0004] 2. Large plasticity, plastic adhesion occurs during the grinding process, blocking the surface of the grinding wheel; at the same time, the melting point of the aluminum alloy is low (660-780 ° C), and the metal on the surface melts and adheres to the surface of the grinding wheel at high temperatures in the grinding area. Increased wheel clogging due to hot melt adhesion

[0005] 3. Large coefficient of linear expansion: under the action of grinding heat, it is easy to cause deformation of aluminum alloy workpiece, thus affecting the grinding accuracy of workpiece surface

[0006] 4. Low grinding efficiency: In order to overcome the thermal deformation of the aluminum alloy workpiece during grinding, reduce the adhesion and clogging of the grinding wheel surface, and ensure the quality of the processed surface, the number of dressings must be increased, thus reducing the grinding productivity

[0007] Because the grinding process of the optical drum of the external drum platemaking machine often fails to meet the precision requirements, the grinding process has never been used to process the optical drum in the industry, and only the turning process is usually used to make it; but because the accuracy level of the lathe is lower than For grinding machines, it is necessary to ensure that the dimensional accuracy of the diameter is within 0.02mm and the cylindricity is within 0.01mm, which has high requirements for the accuracy level of the lathe and the skill of the operator, which also has a certain impact on the product cost.