Aviation manufacturing requirements nc machine tools have advanced, integrated, flexible, high precision and high stability.Numerical control system is the core of the nc machine tool, is the brain of a CNC machine.
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faster and more strong numerical control system makes the nc machine tool has more powerful computing and processing ability, able to complete more complex and elaborate processing.Composite function make the CNC machine significantly improve the machining efficiency of parts, mechanical processing and tend to be high precision, many varieties, small batch, low cost, short processing cycle and complicated.As nc machine tools is increasingly applied to the production of aviation parts, aerospace parts processing ability has been significantly improved, complex parts profile to be able to use digital processing is complete, and its using common equipment is difficult to machining.
& have spentAlthough parts processing capacity increased, but the application level of nc machine tool needs to be improved, both programming technology and processing technology, and many can be room for improvement.Numerical control machine tool the development of advanced features, improve the processing efficiency of CNC machine tool, and maximize the advantages of nc machine tools has become the biggest problem of the technical personnel.
& have spent1. CNC machine function development content
& have spentAviation manufacturing development of nc machine tool function includes the following several aspects:
& have spent(1) develop the hardware function of nc machine tool, such as a bit of damage detection function development, processing condition of blade length, radius and built-in automatic measurement function development.This kind of function development is for part of the nc machine tool not configured when introducing online measuring devices and other hardware facilities, is introducing advanced equipment production process, to improve the advantage in the production process.
& have spent(2) the operating system of the production process, introduced advanced instructions, further developing the advanced nature of numerical control processing.Develop high level instruction machine operating system, such as the rotation of the programmable zero offset, programmable (polyhedral machining), etc.
& have spent(3) the secondary development of high-level programming language, to further improve the advantage of nc machining.
& have spentIn programming has a specific function template with the help of advanced procedures, do regular calculation, to test the machine data, judgment, and simplify, optimization of machining process or in the process of machining mistake proofing function, belongs to the known system advanced statement module program, can have more specific solutions to the problems in the parts production.
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& have spent& have spent& have spent2. The problem of numerical control machine tool application typical & have spentCNC machine tool applications, often appear the programming efficiency and machining efficiency is low, the processing problem of error-prone process more representative include:
& have spent(1) CNC milling thread compiled nc program need to compute the parameters of the more, the programming process is relatively complex and error-prone, so the thread milling program is low efficiency and high error rate.
& have spent(2) with a uniform hole or uniform tank parts, processing each hole to perform repetitive nc program, the processing parts also need large allowance for repeated calls to the same nc program on different knife repairing value to remove allowance.
& have spentThis duplication larger amount of programming work, larger workload, low efficiency of programming.Repeat the knife on the workload of big, easy to get wrong.
& have spent(3) due to the limitation of certain numerical control machine tool coordinate axis stroke, will not be used when programming cycle mode, can only write point coordinates, low efficiency of programming and error-prone.
& have spent(4) in the process of machining tool breakage if not found in time, is likely to cause scrap parts.
& have spent(5) when the parts are processed using the contour programming mode, the operator need to input tool radius within the machine tool, the input of different radius, the cutting tool cutting trajectory is different also.Mistyped easy to cause the parts of the tool radius.
& have spent(6) CNC machining parts before need to establish a coordinate system, operators need to input the coordinate origin into machine tool, the operator input parameter error prone.
& have spent3. CNC machine function comprehensive development
& have spent(1) mistake proofing function development.By the operator to filter, prevent errors occur, the body of the means of this kind of mistake proofing is a person, in the process of actual operation mistake proofing effect and the human ability, and attention has a direct relationship, can’t achieve 100% mistake proofing.Adopts special technology to control the operating process, by computer control, meet the conditions of processing, then stop does not meet the conditions, basic can achieve 100% mistake proofing.Specific include:
& have spent1) bit damage detection function development.Can effectively detect tool wear in the machining process, cutting tool damaged will call the police, avoid tool out-of-tolerance continue to manufacture parts caused by damaged parts.
& have spent(2) vertical lathe, horizontal lathe knife to knife mistake proofing function development, establish the knife point inspection template respectively, and on the knife point inspection before processing, if there is no change point of the knife, the operator is suspended, can effectively avoid the parts in excess of the poor.
& have spent(3) the knife mistake proofing.Check the template, the tool radius are put to build the tool radius value for inspection prior to processing, if the input value of the radius of the suspension does not conform to the requirements, program, out-of-tolerance can effectively avoid the parts.
& have spent(4) G54 milling machining mistake proofing function and numerical control lathe machining G54 mistake proofing function development.The two coordinate system is set up respectively detection subroutine, the program runs before subroutine call detection, if the coordinate system is wrong the program and out-of-tolerance can effectively avoid the parts.
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(2) the nc machine tool function comprehensive development, implementation & other;All single intervention program & throughout;Processing.& other;All single intervention program & throughout;Processing, it is to point to be installed on the CNC machining, without human intervention, that a program started to complete processing and detection process.It will be the past product quality and processing efficiency depends on the skill level of traditional processing forms, shift the whole program, a single intervention process control and equipment to ensure the new form of function, achieve high efficiency, high precision, the whole program and a single intervention.
& have spentSpecific include:
& have spent(1) curing, cutting tools, optimization of cutting parameters, precise statistics to do the knives’ service life;According to a single intervention nc machining needs, optimize the machining process, increase the measurement procedure, reduce duplication of processing, and the original program as a subroutine in series in the machining process program, at the same time will & other;Automatically to the knife & throughout;, & otherMeasuring suspended & throughout;And & other;Hint instructions & throughout;Curing in process monitoring numerical control programs, and by means of coordinate system in the monitoring program framework directive, cutting tool parameters senior command, realize the whole machining process monitoring and management.
& have spent(2) through the cutter radius compensation, monitoring blade length compensation and the origin of coordinates, eliminate the human error, the operator in the process of data entry and make the operation more simple and easy to understand message way, more effective to reduce the operator participation rate.
& have spent(3) the origin mistake proofing, through the absolute coordinates and adjust the coordinate value judgment, and alarm when beyond, eliminate the operator in the process of the origin set wrong operation.
& have spent(4) to optimize the cutting parameter;According to a single intervention nc machining needs, optimize the machining process, reduce duplication of processing, and the original program as a subroutine in the series in the machining process program.
& have spent(5), for automatic knife instruction instead of previous manual operation on the edge of the sword;Will all process in series at the same time, through curing processing parameters, make the whole process of processing and completion.The whole process of implementation without intervention or less intervention.
& have spent6 CNC lathe on-line measurement technology function development.On-line detection can significantly improve processing efficiency, avoid secondary offline detection repair the clamping position, ensure the quality of machining.In machining parts can be real-time correction and compensation, to eliminate waste defective goods produced.Expand the nc machine tool function, improve the nc machine tool performance, improve the efficiency of nc machine tools.Automatic measurement technology, the process of turning tool automatic correction technology and automatic compensation technology to carry out in-depth study, can achieve certain processing, measuring and cutting tool compensation complete automation, improve efficiency and utilization rate of nc machine tool machining parts.
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(3) the development of machine tool compound function, improve the level of intelligent machine tools.Machine tools manufacturers should develop composite function, greatly improve the level of intelligent machine tools.The realization of the function of nc machine tool compound, real-time detection and relies on the workpiece and cutting tool, cutting tool management of intelligent judgment, data operation and control system.The high sensitivity of the probe, high-speed processing chip, a smaller, faster response of sensors and actuators and other automation products and technology will be widely used.Nc machine tool at a good program, machine tools, in accordance with the procedures prescribed by the command execution, in the process of machining, the machine can monitor whether any wear, spindle are fever, vibration, etc., can intervene process at any time, change the running parameters, reduce speed, feed rate, protect the machine or stop, etc.Machine tool manufacturers should clear the development trend of nc machine tools, master the nc machine tool development direction, make the nc machine tools, multiple functions, intelligent, and meet the needs of customers.
& have spent(the original title: aviation manufacturing encounter bottlenecks? How to develop to explore the function of nc machine tool) (source: metal processing Today’s headline number)