Release date : 2021/4/28 2:26:22 Click volume: 360
CNC machining has a very high status in numerical control equipment. Many parts processing companies will apply CNC machining centers. So what types of parts can be processed by CNC machining? As we all know, CNC machining centers are suitable for machining parts that are complex, have many procedures, are more demanding, require multiple types of ordinary machine tools and many tool fixtures, and can only be processed after multiple clamping and adjustments. The main objects of its processing are box parts, complex curved surfaces, special-shaped parts, plate-covered parts and special processing.
(1) Box parts.
Box parts generally refer to parts that have more than one hole system, a cavity inside, and a certain proportion of length, width, and height. This kind of parts are used more in machine tool, automobile, aircraft manufacturing and other industries. Box parts generally require multi-station hole system and plane processing, with higher tolerance requirements, especially the stricter form and position tolerance requirements, usually through milling, drilling, expanding, boring, reaming, countersinking, tapping and other processes , Requires more tools, difficult to process on ordinary machine tools, large number of tooling sets, high cost, long processing cycle, multiple clamping and alignment, manual measurement times, frequent tool replacement during processing, difficult process , And more importantly, the accuracy is difficult to guarantee. For the machining center for processing box parts, when there are many processing stations and the parts that require multiple rotations of the worktable to complete, the horizontal boring and milling machining center is generally selected. When there are few processing stations and the span is not large, you can choose a vertical machining center to process from one end.
(2) Complex curved surface.
Complex curved surfaces occupies a particularly important position in the machinery manufacturing industry, especially the aerospace industry. It is difficult or even impossible to complete complex curved surfaces using ordinary machining methods. In our country, the traditional method is to use precision casting, it is conceivable that its accuracy is low. Complicated surface parts such as: various impellers, wind guide wheels, spherical surfaces, various curved surface forming molds, propellers and underwater vehicle propellers, and some other free-form surfaces. The following are more typical:
①Cam, cam mechanism.
As the basic element of mechanical information storage and transmission, it is widely used in various automatic machinery. Such parts have various curved disc cams, cylindrical cams, conical cams, barrel cams, end cams and so on. For processing such parts, three-axis, four-axis linkage or five-axis linkage machining center can be selected according to the complexity of the cam.
②Integral impeller type.
Such parts are commonly found in compressors of aero engines, expanders of oxygen production equipment, single-screw air compressors, etc. For such a profile, a machining center with more than four-axis linkage can be used to complete.
Such as injection molds, rubber molds, vacuum forming blister molds, refrigerator foam molds, pressure casting molds, precision casting molds, etc. The machining center is used to process molds. Due to the high concentration of processes, the finishing of key parts such as moving molds and static molds basically completes all machining content in one installation, which can reduce the cumulative error of dimensions and reduce the workload of repairing. At the same time, the mold has strong reproducibility and good interchangeability. The work load left by machining to the fitter is small, and wherever the tool can reach, it should be completed by machining as much as possible, so that the workload of the mold fitter mainly lies in polishing.
It can be milled by a machining center. Three-axis milling can only use ball-end milling cutters for approximation processing, which is less efficient. Five-axis milling can use end milling cutters as the envelope surface to approach the spherical surface. When the complex curved surface is processed by the machining center, the programming workload is relatively large, and most of them require automatic programming technology.
(3) Special-shaped parts.
Special-shaped parts are parts with irregular shapes, and most of them require multi-station 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 difficult to guarantee, and even some parts of some parts are difficult to complete with ordinary machine tools. When machining with a machining center, reasonable process measures should be adopted, one or two clamping, and the characteristics of the machining center's multi-station point, line and surface mixed processing should be used to complete multiple procedures or all procedures.
(4) Discs, sleeves and plate parts.
With keyway, or radial hole, or distributed hole system on the end face, curved disk sleeve or shaft parts, such as flanged shaft sleeve, keyway or square head shaft parts, etc., and more porous Processed board parts, such as various motor covers, etc. Disc parts with distributed holes and curved surfaces on the end surface should choose a vertical machining center, and a horizontal machining center with radial holes should 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 process tasks, such as engraving, engraving, and patterning on the metal surface; installing a high High-frequency electric spark power supply can perform line scan surface hardening on metal surfaces; with a machining center equipped with a high-speed grinding head, it can realize the grinding of small modulus involute bevel gears and the 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. Therefore, many companies need to use CNC machining centers in the processing of precision parts, molds, etc., of course. The equipment is expensive and must be maintained and maintained during use.