JPS5929381B2 - Automatic control system for workpiece dimensions in machine tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically controlling a workpiece by an in-process mechanism that controls a machine tool and a post-process mechanism that controls the in-process mechanism.

In other words, the dimensions of the workpieces being machined one after another are continuously measured using an in-process mechanism, and compared with the set machining dimensions.
Even in a mechanical device configured to transmit a control signal to the control mechanism of the machine tool and automatically move the grinding wheel forward and backward, each workpiece is affected by changes in the temperature of the machining fluid and wear of the gauge itself. It changes due to changes in various conditions such as changes in the trend zero point due to temperature characteristics, etc., and this causes errors in the finished dimensions of each workpiece and increases the incidence of defective products. The present invention has been made to solve the above-mentioned drawbacks, and includes a method for automatically controlling machining workpiece dimensions using an in-process mechanism that controls a machine tool and a post-process mechanism that controls the in-process mechanism. Once for every re-inspection of each machined workpiece, the master product, which is being washed and cooled in the same manner as the machined workpiece and circulated through the circulation path, is measured at a separate position away from the processing position, and this measurement value and the post Process Mechanism Nerei Value Memory 5 After the arithmetic circuit section compares the Nerei value stored in the circuit with the Nerei value stored in the circuit, if the measured value of the master product changes with respect to the memorized Nerei value, calculate the difference. This information is transmitted to the post-processing instruction and control unit, which eventually calibrates the memorized values, while the post-processing mechanism re-inspects and memorizes the machined workpiece dimensions using the same gauge head as the master product. , when the average value of the measured dimensions of a predetermined number of workpieces stored in the post-processing mechanism exceeds the plus or minus reference value set based on the above-mentioned stored Neli value, or when the workpiece has dimensions exceeding the reference value/) By correcting the zero point of the in-process mechanism based on the feedback signal output from the post-process mechanism when a predetermined number of workpieces are processed in succession, all workpiece dimensions after machining are completed are within a certain standard range. This invention relates to a method for automatically controlling the dimensions of a processed workpiece. In short, in machine tools that perform dimensional control using a general in-process method, the post-process mechanism compensates for various factors such as temperature changes in the machining fluid, wear of the in-process gauge itself, and tendency zero point changes due to temperature characteristics. In addition, the wear of the gauge of the post-processing mechanism itself, cleaning of processed workpieces, changes in cooling conditions, etc. are corrected using a memory value calibration machine, allowing the Mimasaku machine to process all workpieces under the same conditions. The objective is to ensure that the finished dimensions of the workpiece are continuously maintained with high accuracy.

The configuration of the present invention will be described below with reference to the system configuration diagram shown in FIG. The grinding wheel for a machine tool based on this invention includes an in-process mechanism, a post-process mechanism that outputs a feedback signal that constantly corrects the zero point of this in-process mechanism, and a master product attached to this post-process mechanism that is constantly connected to the workpiece. A mechanism that maintains the same conditions and calibrates the memory value of the post-pro wrestling mechanism controls the forward and backward movement of the grinding wheel so that the workpiece is always processed under the same conditions. That is, the present invention includes a machine tool control mechanism A and an in-process system that measures the dimensions of the work piece being machined one after another, compares it with set machining dimensions, and transmits a control signal to the machine tool control mechanism A. Mechanism B re-inspects and stores the machined workpiece at a different position away from the machining position, and uses this result to re-inspect the master product under the same conditions as the workpiece each time multiple machined workpieces are re-measured. However, when the value is compared with the plus/minus reference value set based on the pre-memorized Neli value and the difference caused by re-inspection of the master product, and if it deviates from the conditions described below, the in-progress test is performed. The post-processing mechanism C provides a zero point correction feedback signal to the mechanism B, and the stored Nely value calibration mechanism D provides a signal for calibrating the stored Nely value of the post-processing mechanism C as a result.

The middle part of the system configuration drawing is the grinding wheel, and the part C is the master product. The control mechanism A of the machine tool has a control section 3, and instructs the workpiece when to move the grinding wheel mouth forward or backward based on information transmitted from the in-process mechanism B, which will be described later.

The in-process mechanism B includes an in-process gauge head section 1 and an in-process instruction that transmits changes in the dimensions of the workpiece being processed, which are transmitted by the in-process gauge head section 1, to the machine tool supporting leg mechanism A as information. Control department 2,
and a meter section 25 whose zero point is constantly calibrated in response to a zero point correction feedback signal from a post-processing mechanism C, which will be described later. The post-processing machine C stores the post-processing gauge head section 4 that re-inspects the processed workpiece through the circulation path 6 for cleaning and cooling, and the detection values from the post-processing gauge head section 4, and stores the results. is compared with a reference value of the brass minus set based on the pre-recorded Nerai value, and when it deviates from the conditions described later, a post process is carried out to transmit a zero point correction feedback signal to the improv wrestling instruction control unit 2. The meter section 52 is configured such that the stored value is always calibrated as a result by a stored value calibration mechanism D, which will be described later. Finally, the memory value calibration mechanism D uses the post-processing gauge head group 4 to measure the master product once for every measurement of a plurality of processed workpieces under the same measurement conditions as the processed workpieces. Measure, and the measured value,
The Nerei value stored in the Nerei value storage circuit 72 is stored in the arithmetic circuit section 7.
1, and when the measured dimensions of the master product change with respect to the stored Ney value, the difference is transmitted to the post-processing instruction control section 5, and the stored Ney value is vertically calculated. It consists of a memory value calibrator 7 for calibrating.

Note that 41 and 42 in the drawings indicate that the same post-processing gauge head section 4 is used for workpiece measurement and for master measurement, and although there is only one gauge head in practice, this is not the case in the explanation. For convenience, the diagram is divided into two parts. This invention does not have the above structure, but its operation is as follows.

That is, the in-process gauge head section 1 is a differential transformer-type detector that continuously measures the workpieces being machined one after another and detects changes in dimensions. It is displayed on the meter section 2' of section 2. When the measured value of the in-process gauge head section 1 reaches the set machining dimension, the in-process instruction and control section 2 outputs an electric signal, which is transmitted to the control section 3 of the machine tool to retract the grinding wheel mouth. The workpieces that have been processed are immediately wrapped up in the post-processing gauge head 4.
be done. Then, the measured value is recorded in the post-processing indicator V)5.The average value of the recorded N measured values is set based on the memorized Neli value as shown in Figure 2. exceeds the plus or minus standard value or exceeds the third
As shown in the figure, when either N consecutive measured values exceeding the reference value or both of the above occur, the feedback signal for zero point correction of the in-process gauge head section 1 is sent to the post-process gauge. It is sent from the instruction control section 5 to the in-process instruction control section 2. That is, in the zero point correction, either FB large (large correction amount) or FB small (small correction amount) is automatically transmitted depending on the amount of shift from the stored Neli value dimension. In this case, the reference value (±) for the memory value, the correction amount (FB large, FB small), the count number N1 of FB small, and the count number N2 of FB large are arbitrarily set depending on the type of machine tool and workpiece. . On the other hand, in the post-processing gauge head section 4, the processed work piece C and the master piece C are passed through a circulation path 6 for cleaning and cooling to maintain them under the same conditions, and for measuring both. Measurements are repeated for a plurality of workpieces and once for the master, under the same conditions of washing and cooling. In addition, the memory value calibrator 7 compares the memory value and the actual value of the master product every time the master product C is measured, and if there is a change, it transmits the difference to the post-processing instruction and control unit 5. As a result, the stored Neli values are calibrated. As explained above, this invention includes an in-process mechanism for controlling a machine tool,
In an automatic control method for processing workpiece dimensions using a post-processing mechanism that controls the in-process mechanism, the machined workpiece is inspected at a different position away from the processing position once every time a plurality of processed workpieces are re-inspected. After measuring the master product that circulates through the circulation path while being washed and cooled in the same manner as the above, and comparing and calculating this traced value with the Nelyi value stored in the Nelyi value storage circuit of the post-processing mechanism in the arithmetic circuit section, If the suppression value of the master product changes with respect to the memory value, what is the difference? transmitting the information to a post-processing instruction and control unit, thereby calibrating the stored Nei value, while re-inspecting and storing the workpiece dimensions processed by the post-processing mechanism using the same gauge head as the master product; If the average value of the measured dimensions of a predetermined number of workpieces stored in the post-processing mechanism exceeds the plus or minus reference value set based on the above-mentioned stored Neli value, or if the number of workpieces with dimensions exceeding the reference value exceeds the predetermined number. Since the zero point of the in-process mechanism is corrected by the feedback signal output from the post-process mechanism in continuous cases, the zero point of the in-process gauge head can be adjusted extremely easily and reliably by the post-process mechanism. In addition, it is possible to accurately compensate for wear of the gauge itself in the post-processing mechanism, cleaning of processed workpieces, changes in cooling conditions, etc., making it possible to automate and unmanned this type of machine tool.

Furthermore, since measurement errors due to heating are dynamically corrected, it is easy to maintain a predetermined machining accuracy of the workpiece being machined.
Furthermore, it is possible to set an optimal feedback system depending on the type of machine tool and workpiece.

[Brief explanation of drawings]

FIG. 1 is a block diagram system configuration diagram according to the present invention.

Claims (1)

[Claims] 1 In an automatic control method for processing workpiece dimensions using an in-process mechanism that controls a machine tool and a post-process mechanism that controls the in-process mechanism, machining is performed once for re-inspection of multiple machined workpieces. At a different location, the master product, which is being washed and cooled in the same way as the processed workpiece, is measured as it circulates through the circulation path, and this measured value is combined with the Nerei value stored in the Nerei value storage circuit of the post-processing mechanism. After comparing and calculating in the arithmetic circuit unit, if the measured value of the master product changes from the stored value, the difference is transmitted to the post-processing control unit and the result is calculated. On the other hand, the workpiece dimensions processed by the post-processing mechanism are re-inspected and stored using the same gauge head as the master product, and the predetermined number of workpiece dimension measurements stored in the post-processing mechanism are calibrated. When the average value exceeds the plus or minus reference value set based on the above-mentioned memorized Neli value, or when a predetermined number of workpieces with dimensions exceeding the reference value occur consecutively, a feedback signal is output from the post-processing mechanism. A method for automatically controlling the dimensions of a machined workpiece in a machine tool, characterized in that the zero point of an in-process mechanism is corrected.