Matters Needing Attention In Checking Fixture Cnc Machining

by xiaolong luo cnc machining shop

There are many contents of CNC lathe machining, including many aspects, especially in CNC precision parts machining and checking fixture machining, these words are often used. These are precautions when machining, and we need to be familiar with them.

1. Precautions on CNC precision parts machining

(1) When the workpiece is too high, it should be cut with different lengths. After using a large knife for roughing, use a small knife to remove the remaining material.

(2) Use flat-bottomed knives to process planes. Ball knives are used less in order to reduce machining time. If there is a slope and it is an integer, a sloped knife should be used for machining.

(3) Reasonably set tolerances, so that the machining accuracy and computer calculation time are balanced with each other, and more procedures are performed to reduce the empty tool time;

(4) The rough material has high hardness, so choose upside down milling; the rough material has low hardness, choose down milling. Rough machining up-milling, finishing machining down-milling;

(5) The tool material has good toughness and low hardness for rough machining, and the tool material has poor toughness and high hardness for finishing.

 

2. Notes on fixture machining

(1) Part clamping method and fixture selection

The clamping method of the cnc machined parts on the CNC lathe should also reasonably select the positioning datum and clamping scheme. In the selection of the fine datum, the two principles of "unification of the reference" and "reference coincidence" are generally followed. We need to consider this principle:

a. Try to complete the machining of all surfaces in one positioning clamp, so choose a positioning method that is convenient for each surface to be processed;

b. When the workpiece is clamped at one time, it should be able to complete the machining of all surfaces of the workpiece;

c. When determining the placement position of the workpiece on the workbench, consideration should be given to the effects of machining at each station, the length of the tool and the rigidity of the tool on the machining quality;

d. Fixtures used in controlled machining should be selected as much as possible by assembling universal components and can be adjusted to shorten the production preparation cycle.

(2) Arrangement of fixture machining sequence

When arranging the machining sequence, the basic principles must be followed, including "face first, then hole", "rough first and then fine", etc. In addition to these basic principles, we should also follow the following principles, as follows:

a. According to the centralized machining of the tool, avoid the repeated use of the same tool multiple times and reduce the number and time of tool changes;

b. For the hole system with high coaxiality requirements, after one positioning, the machining of the hole system should be completed, and then the hole system at other coordinate positions should be processed. This can eliminate the errors caused by repeated positioning and improve Concentricity of the hole system;

c. Select and determine the tool point and the tool change point. Once it is determined, it should not be replaced.

The above are the matters needing attention about CNC precision parts machining and fixture machining. For more information on this, you can consult Dongguan PTJ Cnc Machine Shop.

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Created on Dec 15th 2019 23:52. Viewed 134 times.

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