As we all know, CNC machining centers are suitable for processing parts that are complex, have many processes, have high requirements, require various types of ordinary machine tools and many tool holders, and can only be processed after multiple clamping and adjustments.
The main objects of its processing are box-type parts, complex curved surfaces, special-shaped parts, plate-type parts and special processing.
1. Box parts
Box parts generally refer to parts with more than one hole system, a cavity inside, and a certain proportion in the length, width, and height directions.
Such parts are widely used in machine tools, automobiles, aircraft manufacturing and other industries. Box-type parts generally require multi-station hole system and surface processing, which require high tolerances, especially strict requirements for shape and position tolerances.
For machining centers that process box-type parts, when there are many processing stations and the parts need to be rotated multiple times to complete the parts, horizontal boring and milling machining centers are generally selected.
When there are fewer processing stations and the span is not large, a vertical machining center can be selected to process from one end.
Complex curved surfaces occupy a particularly important position in the mechanical manufacturing industry, especially in the aerospace industry.
It is difficult or even impossible to complete complex curved surfaces with ordinary machining methods. In our country, the traditional method is to use precision casting, and it is conceivable that its precision is low.
Complex curved surface parts such as: various impellers, wind deflectors, spherical surfaces, various curved surface forming molds, propellers and propellers of underwater vehicles, and some other shapes of free-form surfaces.
The more typical ones are as follows:
①Cam, cam mechanism
As the basic element of mechanical information storage and transmission, it is widely used in various automatic machines. To process such parts, three-axis, four-axis linkage or five-axis linkage machining centers can be selected according to the complexity of the cam.
②Integral impeller
Such parts are commonly found in compressors of aero-engines, expanders of oxygen-generating equipment, single-screw air compressors, etc. For such profiles, machining centers with more than four axes linkage can be used to complete them.
③Mould
Such as injection molds, rubber molds, vacuum forming plastic molds, refrigerator foam molds, pressure casting molds, precision casting molds, etc.
④Spherical surface
Machining centers can be used for milling. Three-axis milling can only use a ball end mill for approximation processing, which is less efficient. Five-axis milling can use an end mill as an envelope surface to approach a spherical surface.
When complex curved surfaces are processed by machining centers, the programming workload is relatively large, and most of them require automatic programming technology.
3. Shaped parts
Special-shaped parts are parts with irregular shapes, and most of them require mixed processing of points, lines and surfaces.
The rigidity of special-shaped parts is generally poor, the clamping deformation is difficult to control, and the machining accuracy is also difficult to guarantee. Even some parts of some parts are difficult to complete with ordinary machine tools.
When machining with a machining center, reasonable technological measures should be adopted, one or two clamping, and the characteristics of multi-station point, line, and surface mixed processing of the machining center should be used to complete multiple processes or all process content.
4. Plates, sleeves, and plate parts
Disc sleeves or shaft parts with keyways, or radial holes, or distributed holes on the end surface, curved surfaces, such as shaft sleeves with flanges, shaft parts with keyways or square heads, etc., and more holes Processed plate parts, such as various motor covers, etc.
Disc parts with distributed holes and curved surfaces on the end face should choose a vertical machining center, and a horizontal machining center with radial holes can be selected.
5. Special processing
After mastering the functions of the machining center, with certain tooling and special tools, the machining center can be used to complete some special craft work, such as engraving characters, lines, and patterns on the metal surface.
A high-frequency electric spark power supply is installed on the spindle of the machining center to perform line scanning surface quenching on the metal surface.
The machining center is equipped with a high-speed grinding head, which can realize small modulus involute bevel gear grinding and grinding of various curves and curved surfaces.
From the above introduction, it is not difficult to see that CNC machining centers have a wide range of applications, and there are many types of workpieces to be processed, so many companies need to use CNC machining centers for the processing of precision parts, molds, etc. Of course, this kind The equipment is expensive, and it must be maintained and maintained more during use.
Post time: Dec-16-2022