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How to choose CNC machine center

Nov 22, 2019

cnc machine center(alles cnc)

First, clear the processing object, and then select the CNC machine center equipment

 

Before you determine the object to be purchased, you must first define the object to be processed. In general, parts with the following characteristics are suitable for machining in machining centers:

 

Multi-process intensive type of workpiece means that a large number of tools need to be machined on one workpiece;

 

Positioning cumbersome workpieces, for example, has a porous machining process with a positioning hole pitch accuracy requirement, and is highly convenient to implement by utilizing the high positioning accuracy of the machine tool.

 

Repetitive production of workpieces is suitable for single-piece, small-volume production. Small batches refer to 1-100 pieces, each batch is not much, but it needs to be repeated. In addition, even if the shape of the workpiece is different, it is a similar workpiece, and it is easy to realize the parts of the group processing (GT) process.

 

Complex shape parts such as complex shape parts and aerospace parts can be processed on the CNC machine center by means of automatic programming technology.

 

Box-type and plate-type parts use a rotary table on a horizontal high-speed machining center to perform multi-face machining on the box parts, such as a spindle case, a pump body, a valve body, and an internal combustion engine block. If the top surface is to be machined in one setup, a pentahedral machining center is available. Vertical small machine center is suitable for processing cover cylinder heads, flat cams, etc. The gantry machining center is used to process large cabinets and plate parts, such as diesel engine block, machining center column, bed, and printing wall machine.

 

Second, the choice of CNC machining center specifications

 

According to the determined processing line, the size of the workpiece is cut, and the table size of the required machine tool and the stroke of the three linear coordinate systems are determined accordingly. The size of the table should ensure that the workpiece can be smoothly clamped on the workpiece. The machining size must be within each coordinate stroke. In addition, the space of the tool change and the interference of each coordinate interference zone should be considered.

 

Third, the accuracy of CNC machine center selection

 

According to the machining accuracy requirements of the workpiece, the user can select the machine tool with the corresponding accuracy level. The mass-produced parts may have a precision value of 1.5-2 times of the positioning accuracy. Ordinary machine tools batch processing 8-level precision workpieces, precision machine tool processing accuracy can reach 5-6, but there must be constant temperature and other process conditions, so the precision machine tools are strict and high price.

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Fourth, the choice of CNC machine center tool magazine capacity

 

Manufacturers of CNC machine centers usually have 2-3 different capacity magazines for the same type of machine tools. For example, the horizontal machining center has a capacity of 30, 60, 80, etc. The vertical machining center has 16, 24 32-capacity magazine.

 

When the user selects, the required quantity can be determined according to the process analysis result of the workpiece to be processed. Usually, the capacity of the tool magazine is determined by the number of tools required for one part in one setup, because when another part is processed The tool needs to be rearranged, otherwise the tool management is complicated and error-prone.

 

From the statistical data, the vertical machining center selects a knife magazine with about 20 knives, and the horizontal machining center uses a knife magazine with about 40 knives. Of course, it should be determined according to the actual needs. Machining center machine tools for flexible manufacturing units (FMC) or flexible manufacturing systems (FMS), the magazine capacity should be selected for large-capacity tool magazines, and even with interchangeable tool magazines.

 

Five, selection of CNC machining center selection function and accessories

 

When selecting a CNC machining center machine, in addition to the basic functions and basic components, there are also functions and accessories that the user selects according to their own requirements, which are called selection functions and optional accessories (optional accessories). With the development of numerical control technology, more and more content is available for selection, and the proportion of its constituent price in the mainframe is also increasing. Therefore, it is uneconomical to use a large number of accessories without clear purpose. The so-called "prepared" Ordering guidance is essentially a waste. Therefore, a comprehensive analysis should be made at the time of selection, and long-term factors should be properly considered.

 

The selection function is mainly for the numerical control system, but the price increase is not much, but it has many convenient functions for use, and should be properly configured. For accessories that can be shared by multiple machine tools, one machine can be considered for multi-purpose. But you must consider that the interface is generic.


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