Rational Selection of Machining Center Cutting Methods

1. Basic Selection Principles

When selecting the cutting method, consider two factors: the duration of the processing time, and whether the processing allowance is even. Generally speaking, the annular cutting method is based on the shape of the workpiece and tends to have a more even processing allowance.

The processing allowance is uneven when using the line cutting method. To leave a more uniform allowance after line cutting, it is usually necessary to increase the circumferential cutting track around the boundary. If the requirement for uneven allowance is ignored, line cutting can proceed.

The length of the cutting path is typically short; when considering the unevenness of allowances and increasing circular cutting paths, the total processing time increases for areas with longer boundary edges (such as multi-island situations), as the circular cutting paths around the boundary.

The impact is quite noticeable; linear cutting paths are generally longer than circular cutting paths. The position of linear cutting is easy to calculate and consumes less memory, but there are more times of lifting the blade. When using circular cutting paths, it requires multiple adjustments to the boundary of the ring.

Eliminate and clear self-interlocking loops.

Select based on shape characteristics

The workpiece's外形 features determine the cutting path. Depending on the processed object, workpieces can be simply categorized into flat cavity types and free-form surface types. Flat cavity types generally employ a straight-line cutting method.

Due to the nature of these workpieces, which are typically rough-machined and then finished into shapes like boxes and bases, there is a significant amount of machining allowance. The use of the traverse cutting method is advantageous in leveraging the machine tool's feed rate, enhancing machining efficiency, while

The cutting surface quality is superior to that of annular cutting.

Free-form surfaces are generally processed using circular cutting, mainly due to the fact that these surfaces are often cast or machined from regular shapes, resulting in uneven material distribution. Additionally, there is a high precision requirement for the surface contours. The second reason is...

The cutting method offers superior surface machining characteristics compared to traditional methods, enabling a closer approximation to the actual shape of the curve.

3. Select according to processing strategy

The processing of parts is commonly divided into three stages: rough machining, semi-finishing, and finishing, with sometimes an additional stage of polishing. Properly defining these stages is essential for ensuring machining accuracy. Traditional machining methods...

Due to the relatively single-functionality of machine tools, it is more apparent to distinguish the boundaries of each stage in the process route. However, under CNC milling processing, these boundaries are relatively blurred and may even be merged (such as rough processing)

Phases with refined processing content may also have rough processing traces (e.g., in the refining phase), so for ensuring processing quality, the segmentation of processing stages during CNC machining is necessary. However, to minimize clamping time and simplify...

How to determine the processing content at each stage of the cutting action, considering issues that may differ from traditional processing techniques.

The primary goal of rough machining is to maximize the material removal rate per unit time and prepare the workpiece geometry for semi-fine machining. Therefore, methods like linear cutting or combined cutting are commonly used. The main focus of semi-fine machining is...

The goal is to achieve a flat contour shape of the workpiece with uniform surface finishing allowance. Therefore, the annular cutting method is often employed. The primary objective of the finishing process is to obtain workpieces that meet the required geometric dimensions, shape accuracy, and surface quality.

The internal cutting is performed using a linear method based on the geometrical features of the workpiece, while the edges and joints are cut using a circular method.

4. Select based on programming strategy

The principles for determining the cutting method during programming mainly include: ensuring the machining accuracy and surface roughness requirements of the parts; attempting to shorten the machining route and reduce the time for tool idle movement; and making numerical calculations as simple as possible.

Single, the number of program segments is minimized to reduce programming workload. Generally, for flat cavity parts, the segmented cutting method is used to divide the machining area to minimize the number of lift cuts; for free-form surface parts, the ring cutting method is employed to approximate the shape. Stock.

The selection of shape and size can influence programming choices. By enlarging the blank's outer shape, it is possible to convert difficult-to-clamp shapes into easy-to-clamp form-cutting cavities; or, instead of using ring-cutting for free-form surfaces, another method can be employed.

The company has adopted a slicing method to reduce excess material, thereby enhancing processing efficiency.