0 Preface
Manufacturing technology is a measure of a country's industrialization level. With the rapid development of China's economy, China's manufacturing industry has made considerable progress.
The quantity and technical level of CNC machine tools is an important symbol of a country's modern manufacturing strength. At present, China is in a critical period of transition from a machinery manufacturing country to a machinery manufacturing country. CNC machine tools are used in the automotive industry, aerospace industry, molds, etc. The industry has been widely used.
It has improved the performance level, processing quality and production efficiency of components and created great benefits for users of CNC machine tools.
1. Current Status of Research on NC Transformation at Home and Abroad
Some developed countries such as Japan, the United States, and Europe have attached great importance to CNC transformation. Some manufacturing companies have tried their best to transform ordinary machine tools into CNC machine tools in order to enhance their core competitiveness. Some companies have even converted CNC machines into an industry, such as Germany. Schioess Inc., United States of America's equipment company, these companies are the world's well-known CNC machine tool transformation.
Restricted by manufacturing technology at that time, China's machinery manufacturing industry has about 80% equipment ratio in the machinery manufacturing industry, and the degree of numerical control is very low. Due to the relative backwardness of the NC transformation technology at that time, the transformation technology of China's CNC machine tools was mainly applied to the defense military machine tool equipment. Since the 1980s, a large number of proficient NC machine tool technology experts have conducted a lot of effective development on the NC machine transformation technology of ordinary machine tools. Research has made quite remarkable achievements.
2. Necessity of general machine numerical control transformation
2.1 Insufficient General Machine Tools in the Digital Environment
Ordinary machine tools are subject to technical restrictions, and the machining accuracy, processing quality stability, reliability, production efficiency, improvement of working conditions, and modernization of production management are far from those of CNC machine tools. The general machine tool has a simple process and a single function, and can only perform a single operation. However, the production requirements for more parts and complex parts and components cannot be completed.
The processing time and the auxiliary time affect the efficiency, the general machine tool has a low processing precision and a low degree of automation. Many operation procedures rely on the worker's operation, and the labor intensity is high, and the product quality is inconsistent, and often it cannot guarantee the high quality of the processing part.
2.2 Advantages of ordinary machine tools after CNC transformation
Better flexibility, CNC machine tools different ordinary machine tools in the processing of parts need to make a lot of fixtures, molds and often replaced, the parts on the transformation of the CNC machine tools, the key depends on the program design, input, editing, and does not require the machine It is often adjusted; the quality of the machined parts is stable and consistent; the same machining program and tool are used to process a batch of parts on a CNC machine tool, the machining conditions are the same, the trajectory of the cutting tool is exactly the same, and the production efficiency is high. The CNC machine tool and the ordinary machine tool In comparison, the auxiliary time and machining time of the parts matched with the tool magazine of the machining center can be effectively reduced. The numerically-controlled machine tool allows the machine to carry out powerful cutting with a large amount of cutting, and the range of feed amount is expanded.
In addition, with the use of a machining center's tool magazine, continuous machining of multiple processes can be realized on one machine tool, the turnaround time between processes is greatly reduced, and productivity is improved.
The machining accuracy of CNC machine tools can generally reach 0.05mm-0.1mm. The average error of the screw pitch of the CNC machine tool and the feed backlash of the drive chain can be compensated by the numerical control device. The numerical control machine tool controls the machining accuracy through digital signals. Each pulse equivalent of the machine tool needs to output a pulse signal by the numerical control device. Therefore, the positioning accuracy of the numerical control machine tool is relatively high.
With modern production management, when the CNC machine tool is used for parts processing, the used fixtures and tools can be standardized, and the auxiliary time and processing time of the part can be accurately estimated to realize modern management. Compared with ordinary machine tools, CNC machine tools improve the working conditions. Before processing, CNC machine tools are adjusted, input programs are started, and CNC machine tools automatically and continuously process parts until the parts are processed.
3, digital environment transformation measures under the digital environment
3.1 Fully understand the modified machine tool
CNC machine tools generally consist of a measuring system, a servo system, and a numerical control system. Ordinary machine tool transformation of the transformation of whether it is to be part of the transformation or all the transformation will be determined by the ordinary machine tool transformation costs and the original parameters of performance. In the process of numerical control transformation, we must first understand the functions, parameters, mechanical transmission accuracy, and operating conditions of the existing machine tools that need to be modified. Then we can estimate in advance whether the performance of ordinary machine tools after transformation can meet the requirements. Specifically, the following items must be clearly defined:
(1) Determine the type of machine that needs to be modified.
(2) Accurately grasp the parameters and performance parameters of common machine tool mechanisms that need to be modified.
(3) For the transformation of ordinary CNC machines, the number of control axes should be carefully selected because the number of axes directly determines which NC system is selected for matching.
(4) Before the NC transformation of ordinary machine tools, the core functional components of the original machine tool such as gearboxes and tool holders must be clearly understood, so as to ensure that the machine tools after CNC transformation can produce complex parts.
(5) In order to ensure the accuracy and functional expectations of general machine tools after CNC transformation, it is necessary to estimate the parameters and mechanical structure parameters of CNC machine tools after CNC transformation.
(6) Before the NC transformation of common machine tools, some auxiliary safety performance parameters of the machine tools need to be understood to ensure the personal safety of the operators after CNC machine transformation.
(7) In the process of NC transformation of ordinary machine tools, it is necessary to consider whether the existing electrical control system can meet the requirements of the modified CNC machine tools. If they cannot meet the requirements, they must be reconstructed through programmable logic controllers.
3.2 Selection of Numerical Control System Based on Digital Environment
Based on the digital environment, the key to digital control of ordinary machine tools is the selection of numerical control systems. When selecting the type, the appropriate CNC system is selected according to the machine parameters and performance parameters that need to be modified to ensure that the ordinary machine tool will perform the part processing according to the pre-defined default functional requirements after the modification, otherwise the functional expectations cannot be achieved.
There are numerous numerical control systems with different functions and types on the market. Therefore, when selecting a numerical control system based on the digital environment, full consideration should be given to the functions and characteristics of ordinary machine tools before transformation, the precision requirements and functional expectations to be achieved after the numerical control transformation, and It is expected that the cost of retrofitting; and when selecting the numerical control system, special attention should be paid to the technical support provided by the manufacturer of the selected numerical control system during the retrofit.
Different CNC systems have different specific requirements for the machine structure and the drive device of the machine tool that needs to be modified. Not all machine tools can carry out numerical control transformation. It is not necessary to match any numerical control transformation machine tool with all different numerical control systems. It must be selected properly. The CNC system is matched to achieve the purpose of NC transformation.
3.3 Based on the digital environment of the mechanical structure design and transformation
The key to NC transformation of ordinary machine tools is the selection of the CNC system. However, in order to make CNC machine tools to meet the requirements of machining accuracy, function parameters, electrical supply system, and machine safety operation rules, the mechanical structure of the machine tool must be redesigned during the transformation process. , transformation. First of all, based on the requirements of the mechanical structure design in the digital environment. It is necessary to perform force analysis on the mechanical components such as the machine tool drive shaft to ensure that the CNC machine tool can carry out powerful cutting with a relatively large amount of cutting force, and perform force analysis based on the machine tool industry standards and national standards.
According to the force analysis and calculation results, determine the size and power supply of the main mechanical parts needed to ensure the numerical control of the transformation of the machine to achieve the machining accuracy, function parameters, electrical supply system and machine tool safety operation, and numerical control transformation When the machine tool is designed and modified for the mechanical structure, it can refer to the successful case of reform, refer to the relevant technical documents and information, and conduct site surveys on the successful transformation of the enterprise.
The NC lathes of CA6140 type are to be transformed by CNC. The following requirements must be fulfilled during the entire design process: the main drive system of the original lathe is retained, the open-loop control of the horizontal feed system is realized by a microcomputer, and the two axes are linked; the tool holder adopts automatic indexing. The tool holder has the function of cutting thread; the feed pulse equivalent is 0.005mm/pulse in X direction; the stepless speed regulation in the feed speed range of 3—1000mm/min, in X direction, 1000—3000mm/min Randomly set the fast forward speed.
Second, based on the requirements of the transformation of the machine tool mechanical structure in the digital environment. As far as possible, when the mechanical components are rebuilt, the dimensions do not change or change little, and the ideal mechanical transmission structure device is adopted to meet the maximum transmission ratio, so as to increase the production and processing efficiency; the required mechanical components must meet certain accuracy requirements, such as surface Roughness, shape tolerances, hardness, strength, etc. to ensure smooth movement between moving parts, reduce frictional resistance; ensure the digital control after no need to increase power
The machine tool can produce more complex parts.
Conversion of CA6140 lathes into economical CNC lathes and transformation of transverse feeding mechanisms: transformation of small carriages and manual tool rests into numerically-controlled tool rests; ball screw nut sub-replacement of carriage box, light bar feed box and normal wire Rod; The manual mechanism for adjustment operation remains unchanged, while the support structure is retained, and the gear box body and the stepping motor are mounted on the rear side of the middle carriage, and the gear box is decelerated by the first gear.
4 Conclusion
This article has focused on the key measures to transform an ordinary machine tool into a CNC machine tool, and proposed a technical transformation of the NC machine tool to transform an ordinary machine tool, with a view to helping companies that need ordinary CNC machine tools to transform.
Omega Light Keel Roll Forming Machine is used galvanized, PPGI, Aluminum coils as raw materials, products are light weigth, heavt duty, ususlly used for building decorations, especially suitable to use in bedroom, kitchen, washroom, corridor and so on.
Specifications:
Raw material
PPGI, GI, Aluminum coils
Material thickness range
0.3-1mm
Forming speed
30-40m/min(without punching)
Rollers
12 rows
Material of forming rollers
45# steel with chromed
Shaft diameter and material
40mm, material is 40Cr
Controlling system
PLC
Material of cutting blade
Cr12 mould steel with quenched treatment
Voltage
380V/3Phase/50Hz or at your requirement
Main motor power
4KW
Hydraulic atation power
3KW
Way of driven
Gear box
Working process:
Decoiler - Feeding guide - Straightening - Main roll forming machine - PLC control system - Servo tracking cutting - Receiving table
Pictures for machine:
Training and Installation :
1. We offer installation service local in paid, reasonable charge.
2. QT test is welcome and professional.
3. manual and using guide is optional if no visiting and no installation.
Certification and after service:
1. Match the technology standard, ISO producing certification
2. CE certification
3. 12 months warranty since the delivery. Board.
Our advantages:
1. Short delivery period.
2. Effective communication
3. Interface customized.
Omega Light Keel Forming Machine
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YingYee Machinery and Technology Service Co.,Ltd , https://www.yingyee.cn