NC Machining Technology

NC machining is to compile the NC program of parts according to the original conditions such as part drawings and process requirements, and input it into the NC system of NC machine tools to control the relative movement of tool and workpiece in NC machine tools, so as to complete the processing of parts

In a sense, the processing technology has a certain impact on the accuracy and efficiency of parts processing. For the selection of NC processing technology, first of all, it is necessary to analyze the basic structure and dimensional accuracy requirements of products, then determine the processing procedures, and further ensure the accuracy of NC programming; secondly, it is necessary to ensure the rationality of NC processing route, meet the relevant requirements of process formulation, effectively reduce processing errors and ensure the processing accuracy of products; The NC machining process should be relatively centralized to improve the efficiency of NC machining. For the processing of complex parts, the support of NC simulation technology is needed to ensure the scientific and complete processing process.

Research on Processing Technology Route

In the actual NC machining, the processing route needs to be determined in combination with the specific processing links. For example, in the process of cylindrical surface processing, the requirements of coaxiality and concentricity need to be involved. At this time, the workpiece needs to complete most of the processing procedures in one clamping process, so as to reduce the impact of processing and clamping errors. At the same time, the determination of the process route should also take the feed route of product processing as a reference. The so-called feed route refers to the path and direction of the tool location relative to the workpiece, which also includes cutting blank path such as cutter cut-in and cutter cut-out.

Selection of Workpiece Coordinate System

The selection of workpiece coordinate system has a certain influence on the accuracy of parts and the determination of processing route. At the same time, the errors of product dimension chain vary with the selection of coordinate system. The main influencing factor of establishing workpiece coordinate system is the selection of programming origin, which is directly related to the convenience of workpiece processing operation. At the same time, the correct selection of programming origin can reduce the calculation of programming value and processing error.

Analysis of the Precision of NC Machine Tools

The mechanical transmission mechanism of the feed mechanism is composed of reducer gear, coupling, ball screw pair and supporting bearing. In the composition of these mechanisms, if there are gaps in the connection of these structures, it will directly affect the feed accuracy of the worktable, especially in the movement commutation of these mechanical components, which will improve the error of the whole processing link. If the gap error of feed mechanism is reduced, the machining accuracy of NC machine tools will be greatly improved.

The advantages of NC machining.

(1) High productivity

CNC machine tools can effectively reduce the processing time and auxiliary time of parts. The spindle speed and feed range of CNC machine tools are large. It allows the machine tools to carry out strong cutting with large cutting amount. The rapid movement and positioning of moving parts of CNC machine tools and high-speed cutting can reduce the turnaround time between processes of semi-finished products and improve production efficiency.

(2) High machining accuracy

The processing accuracy of NC machine tools can generally reach 0.005-0.1 mm. NC machine tools are controlled by digital signal. For each pulse signal output by NC device, the moving parts of machine tools move a pulse equivalent (usually 0.001 mm). Moreover, the average error between the backlash of the feed chain and the pitch of the screw can be compensated by NC device. Therefore, the NC machine tool can be set. The position accuracy is relatively high.

(3) Highly flexible

In order to ensure the surface accuracy of the workpiece, it mainly depends on the processing procedure. It is different from ordinary machine tools. It does not need to manufacture and replace many tools and fixtures, and it does not need to adjust the machine tools frequently. Therefore, CNC machine tools are suitable for frequent replacement of parts. That is to say, it is suitable for single-piece, small-batch production and new product development, which shortens the production preparation cycle and saves a lot of cost of process equipment.

(4) Processing quality is stable and reliable

Processing the same batch of parts, in the same machine tool, under the same processing conditions, using the same tool and processing procedures, the tool path is exactly the same, the consistency of parts is good, and the quality is stable

(5) Facilitating the Modernization of Production Management

NC machine tool processing can accurately estimate the processing time in advance, and the tools and fixtures used can be standardized and modernized management. NC machine tools use digital signals and standard codes as control information, which is easy to realize standardization of processing information. At present, it has been organically combined with computer aided design and manufacturing (CAD/CAM), which is the basis of modern integrated manufacturing technology.

(6) Improving Labor Conditions

After the NC machine tool is adjusted before processing, input program and start, the machine tool can automatically and continuously process until the end of processing. Operators are mainly the input, editing, loading and unloading parts, tool preparation, observation of processing state, inspection of parts, etc. The labor intensity is greatly reduced, and the labor of machine tool operators tends to be intelligent. In addition, machine tools are generally closed processing, which is clean and safe.

If you are looking for Metal Machining in China , please visit our website:https://www.chinasynergygroup.com/ and contact us.