CNC precision machining to do maintenance measures

Specific operating requirements for CNC precision machining

I. The application environment of CNC equipment In order to improve the service life of CNC equipment, it is generally required to avoid direct sunlight and other heat radiation, and avoid too much humidity , where there is excessive dust or corrosive gas. Precision CNC equipment should be separated from equipment with large vibration, such as punching and forging equipment.

Second, good power supply guarantee In order to avoid the influence of large fluctuation of power supply (greater than ±10%) and possible instantaneous disturbance of light signals, machining CNC equipment generally adopts special line power supply (such as from the low-voltage power distribution room). It can be used separately for CNC machine tools) or add voltage stabilizer devices, etc., which can reduce the influence of power supply quality and electrical disturbance.

Three, formulate effective operation rules In the application and management of CNC machine tools, a series of realistic and effective operation rules should be formulated. For example, lubrication, maintenance, reasonable application and standard accountable shift system are the main contents of CNC equipment application and management. Formulating and complying with CNC precision machining operating procedures is one of the important mistakes to ensure the safe operation of CNC machine tools.

1. Datum

Datum refers to the point, line and surface on which the relationship between the multiple elements of the manufacturing tool is determined. For a mechanical part, the datum is the points, lines, and surfaces on which the rest of the parts, lines, and surfaces are determined.

In the process of design and processing of mechanical parts, which points, lines and surfaces are selected as benchmarks according to different requirements is one of the main components that simply affects the machining processability of parts and the size and position accuracy between surfaces . According to the different functions and applications, benchmarks can be divided into two categories: design benchmarks and process benchmarks.

Design datum refers to the datum accepted to mark the design dimension on the part drawing. On a mechanical part drawing, there can be one or more design datums.

The process benchmark refers to the benchmark adopted in the process history of the part. According to different uses, the process reference can be divided into process reference, positioning reference, measurement reference and assembly reference.

1. Process benchmark

In the process diagram, the benchmark used to determine the size, shape and position of the machined surface in this process is called the process benchmark.

2. Positioning datum

During processing, the datum used to determine the position of the workpiece on the machine tool or in the fixture is called the positioning datum.

3. Measurement benchmarks

During or after processing, the benchmarks used to measure the shape, position and dimensional errors of the workpiece are called measurement benchmarks.

4. Assembly benchmarks

During assembly, the benchmarks used to determine the relative position of parts or components on the product are called assembly benchmarks. For example, the inner hole of the gear is the assembly reference of the gear. Under normal circumstances, the design basis is given on the part drawing, and the process benchmark is selected and determined by the craftsman according to the specific process history.

When analyzing the datum question, CNC precision machining must pay attention to the following two points:

The point, line and surface as the datum do not necessarily exist on the workpiece, but are determined by some These surfaces are called base surfaces. For example, the middle line of the inner hole is represented by the inner hole surface, the middle line of the inner hole is the reference, and the inner hole surface is the base surface. Therefore, the question of choosing a datum is the question of choosing an appropriate basal plane. In particular, the datum and the base plane may be collectively referred to as a datum for convenience of discussion.

As a datum, it can be a point and line without area or a very small surface, but the base surface representing this datum always has a certain area. For example, a long shaft is placed on a lathe with a top, and the base is the axis line, which has no area; the base is the cone of the top, which has a very small area but does have a certain area.

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