Abstract: The method of numerical control machine 87 reference point is analyzed. Details of the machine tool reference point machine zero point and process zero point between our machine's existing CNC machine tools, the way to return to the reference point is different, according to the machine tool Find the reference point of the machine in different ways according to their own characteristics. Back to the reference point is an important function of the CNC machine tool. Whether the reference point can be correctly returned will affect the machining accuracy of the product. Therefore, whether the reference point can be correctly returned is the most critical question for the CNC machine tool. The back reference operation is closely related to the position detection and speed feedback. The accuracy of the reference point is related to the accuracy of the sensing element. This article introduces the reference point method with examples, so that we have a comprehensive understanding of the benchmark points of CNC machine tools.
Several ways of returning to the reference point back to the reference point operation mode are not correct due to the difference between the machine type and the manufacturer, and the corrected value is corrected after the corrected value is corrected.
5 Conclusion 0 elbow 3 system has a spatial positioning function, the system determines the spatial coordinate size of the banana beam space, and adjusts with the gasket, which can eliminate the error caused by the deformation, meet the paper size requirements, and ensure the installation precision of the continuous casting equipment. The accuracy is used. The date of receipt is the same as that of April 9, 2001. The following methods are discussed in several ways. Before returning to the reference point, manually move the axis to the vicinity of the reference point at a selected speed, and then start the operation back to the reference point. The shaft moves to the reference point at the cut-off speed and hits the reference point switch. The measurement system, ie, looks for a zero mark on the position detecting element. When the zero mark is reached. A zero mark pulse signal is issued. The axis is braked to zero under the action of this signal. Then move forward a specified distance. This distance is set by the software parameters. Can be zero, stop at the same time. The stopped position is the base point.
When returning to the reference point, the axis first moves to the reference point at the reference point velocity, and hits the reference point switch. Deceleration to the shutdown speed under the control of the generated deceleration signal continues to advance to the zero point of the measurement system, then brakes to zero, and then continues to advance to the specified distance and stops at the reference point at the shutdown speed.
Russia 66 with 504 CNC gantry milling and Germany 1420225 CNC boring machine is back to the benchmark point in this way. Generally, the CNC machine tools that return to the reference point in this way are far from the limit of the terminal, so that there are more machine tools that return to the point in this way. For example, the process of returning the reference point to the 6645 elbow 04 CNC gantry is to quickly move to the reference point. When the head switch is hit, the machine starts to decelerate. And continue to move forward at the turn-off speed. When the touch iron leaves the head switch, it brakes to zero, and then moves forward at the cut-off speed by a specified distance to stop at the reference point.
In West Germany, the position detection of the 420225 CNC boring machine uses a metal grating ruler, and a metal sliding piece is arranged in the ruler case to shield the magnetic circuit.
During the search for the machine reference point, the magnetic field is shielded when the readhead moves to the metal slide. Operate the lower reed switch on the readhead. A deceleration signal is issued. When the readhead continues to move to the zero mark, a zero pulse signal is issued and the machine is stopped at the specified position. That is, the reference point position.
The reference point axis moves to the reference point quickly, and when it hits the reference point deceleration switch, it brakes to zero and then moves slowly in the reverse direction. When it reaches the zero mark of the measuring system, it first brakes to zero, then moves forward to the specified distance and stops at the reference point. 2410 CNC rotary milling adopts the West Portal 8400 numerical control system, and its beam axis adopts this method to return to the reference point because of the machine tool. The set position of each punctuality is very close to the limit of the terminal. It is safer to return to the benchmark in this way. Because 3 touches the iron, it is on time, reverse movement after closing, away from the terminal limit switch. To avoid hitting the hard limit sweat due to the fault condition of the reference point.
When the reference point is 4, the axis moves to the reference point quickly, and when it hits the reference point switch, it brakes to zero. Then reverse the micro-motion until it departs from the deceleration switch, then it will slightly move into the deceleration switch in the original direction, and move forward at a slow speed. When it reaches the zero-condition of the measurement system, it will brake to zero, and then move forward to the specified distance. At the reference point 2, its punctuality is related to the machine zero and the process zero. The CNC machine must determine its own reference point. Only after determining the position of the reference point. Other points, such as machine zero and process zero, can be determined accordingly.
The point at which the reference point position measuring device starts detecting. It finds the reference point on the encoder or digital scale through the reference point limit. It makes the machine zero point. It is the zero point specified by many factors such as the machining of the machine structure. For example, the machine zero of the batch 420225 CNC boring and milling machine is such that the center line of the input shaft and the center line on the table are in the surface. The zero point of the axis machine tool, the center line of the axis spindle and the plane on the table are on the plane of the axis machine zero.
At 75mm, it is a 2-axis machine zero. When the end face of the history axis and the end face of the square ram are in the same plane, it is the zero point of the boundary axis machine tool. The machine zero is a man-made point, when this point is determined. The parameter of CNC machine tool 1 804189 is to set the position of the machine zero point relative to the reference point. This point is also determined by the reference point. The Ding Yi origin is the position of the machine operator's programmer according to the position of the workpiece during machining. The process of adding the process, relative to the point set by the machine zero. There are 12 process origins in CNC machine tools, which can be derived from the above analysis. A reference point for CNC machine tools is indispensable. They each have their own role. And there is an intrinsic connection between them. Determining their order is to first determine the benchmark point, and then determine the machine point and the factory zero.
3 Conclusion Through the analysis of the above-mentioned methods of reference points, we have a relatively detailed understanding of the process of CNC machine tools and benchmarks. It is discussed in the numerical control machine which method is used to return to the reference point. The relationship between machine zero and process defect between the reference points of CNC machine tools is discussed, which provides a basis for us to correctly use the reference point machine zero and process zero in machining.
Received on May 9, 2001, Xingqihui Heavy Group Co., Ltd. Production Engineer, Li Zhiweizhang Group Company, Zhuzhe Equipment Manufacturing Factory Engineer Zhuo Shicheng re-established the Gonggong 3 26 branch factory engineer, today and now,
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