JP3661202B2 - Forging equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a forging apparatus that automatically adjusts a slide bottom dead center position of a press machine.
[0002]
[Prior art]
Since the processing by the press machine is performed by the stroke movement of the slide, if the bottom dead center position of the slide is changed, the product accuracy (product dimensions) is greatly affected. Therefore, it is necessary to keep the bottom dead center position of the slide constant, and conventionally the following methods have been proposed.
[0003]
(1) A method of measuring the product dimensions after processing and adjusting the bottom dead center position of the slide by an amount different from the target value (Japanese Patent Laid-Open No. 4-313500).
(2) A method of determining the correction amount of the bottom dead center clearance by measuring the top dead center and the bottom dead center of the slide (literature name: Press Technology Vol. 31, No. 3).
(3) A method of measuring the amount of load during press working and adjusting the bottom dead center position of the slide so that the amount of load is constant (Japanese Patent Laid-Open No. 63-180400).
[0004]
[Problems to be solved by the invention]
The product dimensions determined by the bottom dead center position of such a slide are particularly affected by the workpiece temperature, workpiece hardness, workpiece dimensions, and die temperature of the press machine before processing.
However, in the above method (1), since it is a post-process that adjusts the bottom dead center position of the slide based on the product dimensions after pressing, it is completely free from variations in workpiece temperature, hardness, and dimensions before processing. There is no effect, and there is a limit to increasing the accuracy of product dimensions. Also, due to the time delay, about 1 to 10 dimensional defective products are produced before the actual correction.
[0005]
The method (2) is effective for changing the bottom dead center clearance due to mold temperature fluctuations, but since it is a post-processing process similar to the method (1) above, the workpiece temperature, hardness and dimensions can be adjusted. There is no effect on the variation of each factor, and there is a limit to increasing the accuracy of product dimensions.
The method (3) is a post process similar to the methods (1) and (2), and there is almost no correlation between the molding load and the product dimensions, so it is difficult to increase the accuracy of the product dimensions. is there. The present invention has been made based on the above circumstances, and an object of the present invention is to provide a forging apparatus that achieves high product dimension accuracy.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in claim 1, a press machine that presses a material into a predetermined product size in accordance with a stroke movement of the slide, and the material before processing that affects the product size. Material information measuring means for measuring information on the basis of the measured value of the material information measuring means based on the relationship between the bottom dead center clearance of the press and the product dimensions corresponding to the information on the material before processing. A bottom dead center clearance calculating means for calculating a bottom dead center clearance necessary for obtaining the product dimensions, and a bottom dead center position of the slide based on the bottom dead center clearance calculated by the bottom dead center clearance calculating means. Correction amount calculation means for calculating a correction amount for correcting the correction, and bottom dead center position adjustment means for adjusting the bottom dead center position of the slide based on the correction amount calculated by the correction amount calculation means Adopt the technical means provided with a.
[0008]
In claim 2 , in accordance with the stroke movement of the slide, a press machine that presses the material into a predetermined product size, material information measuring means that measures information of the material before processing that affects the product size, Based on the relationship between the press machine information measuring means for measuring the information of the press machine that affects the product dimensions, and the product dimensions corresponding to the information on the material before processing and the bottom dead center clearance of the press machine, First bottom dead center clearance calculating means for calculating a bottom dead center clearance necessary for obtaining a target product size from the measured value of the material information measuring means, bottom dead center clearance of the press machine, and information on the press machine The bottom dead center clearance necessary for obtaining the target product dimensions is calculated from the measured value of the press machine information measuring means based on the relationship with the product dimensions corresponding to 2 The bottom dead center position of the slide is calculated based on the bottom dead center clearance calculated by the bottom dead center clearance calculating means, the first bottom dead center clearance calculating means, and the second bottom dead center clearance calculating means. Technical means comprising: a correction amount calculating means for calculating a correction amount to be corrected; and a bottom dead center position adjusting means for adjusting the bottom dead center position of the slide based on the correction amount calculated by the correction amount calculating means. Is adopted.
[0009]
According to a third aspect of the present invention, in the forging apparatus according to the first or second aspect , the measurement by the material information measuring means is performed at every processing or at certain intervals.
[0010]
According to a fourth aspect of the present invention, in the forging apparatus according to the second aspect of the present invention, the measurement by the press machine information measuring means is performed at every processing or at certain intervals.
[0011]
Characterized in forging apparatus as claimed in the claim 5, claim 1 or 2, said the information material, the temperature of the material, the material hardness, and at least is one of the dimensions of the material And
[0012]
According to a sixth aspect of the present invention, in the forging apparatus according to the second aspect, the information on the press machine is a temperature of a die of the press machine.
[0013]
[Operation and effect of the invention]
The forging apparatus according to the first aspect of the present invention is a bottom dead center clearance necessary for obtaining a target product size from the measured value of the material information measuring means, that is, the information of the material before processing that affects the product size. And the bottom dead center position of the slide is adjusted based on the correction amount calculated from the calculated bottom dead center clearance.
In this way, by adjusting the bottom dead center position of the slide based on the material information measured before actual processing, even if the material information fluctuates, it is possible to press with the optimum bottom dead center clearance for each product. Since it can be processed, highly accurate products can be stably produced.
[0015]
The forging and forming apparatus of the present invention as set forth in claim 2 calculates the bottom dead center clearance necessary for obtaining the target product dimensions from the information on the material before processing and the information on the press machine that affect the product dimensions. Then, the bottom dead center position of the slide is adjusted based on the correction amount calculated from the calculated bottom dead center clearance.
In this invention, by measuring the information of the material before processing and the information of the press machine that affects the product dimensions and adjusting the bottom dead center position of the slide, the product can be obtained even if the information of the workpiece and the information of the press machine fluctuate. It is possible to press with the optimum bottom dead center clearance. As a result, the product dimensions can be made more accurate than in the first aspect of the invention.
[0016]
The information on the material before processing that affects the product dimensions is at least one of the temperature of the material, the hardness of the material, and the size of the material, as described in claim 5 .
Further, the information on the press machine that affects the product dimensions is the die temperature of the press machine as described in claim 6 .
[0017]
【Example】
Next, an embodiment of the forging apparatus of the present invention will be described with reference to FIGS.
FIG. 1 is a system configuration diagram of a forging apparatus.
The forging apparatus 1 of this embodiment includes a press machine 2, a product dimension measuring apparatus 3, a workpiece temperature measuring apparatus 4, a workpiece hardness measuring apparatus 5, a workpiece dimension measuring apparatus 6, a mold temperature measuring apparatus 7, a slide control apparatus 8, and It consists of a die height control device 9 and the like.
[0018]
The press machine 2 includes a slide 2a that performs a stroke motion, an upper die 2b that is movable integrally with the slide 2a, and a lower die 2c that is disposed to face the upper die 2b. The material 11 (hereinafter referred to as the workpiece 11) conveyed by the above is pressed between the upper die 2b and the lower die 2c.
The product dimension measuring device 3 measures the dimension (thickness dimension) of the product 11a processed by the press machine 2, and is, for example, a displacement meter such as an operating transformer type, a vortex type, or a laser type.
[0019]
The workpiece temperature measuring device 4 measures the temperature of the workpiece 11 before being processed by the press machine 2, and is, for example, an infrared radiation type or thermocouple type thermometer.
The workpiece hardness measuring device 5 measures the hardness of the workpiece 11 before being processed by the press machine 2, and is, for example, an ultrasonic contact type hardness meter.
The workpiece dimension measuring device 6 measures the dimension (thickness dimension) of the workpiece 11 before being processed by the press machine 2, and is, for example, a displacement meter such as an operating transformer type, a vortex type, or a laser type. The material information measuring means of the present invention is a workpiece temperature measuring device 4, a workpiece hardness measuring device 5, and a workpiece dimension measuring device 6.
[0020]
The mold temperature measuring device 7 (the press machine information measuring means of the present invention) measures the mold temperature of the upper mold 2b and / or the lower mold 2c of the press machine 2 and is the same infrared as the workpiece temperature measuring apparatus 4. Radiation or thermocouple thermometer.
The slide control device 8 (bottom dead center position adjusting means of the present invention) drives a slide adjustment motor (not shown) built in the press machine 2 based on a control signal output from the die height control device 9. The bottom dead center position of the slide 2a is adjusted.
[0021]
The die height control device 9 includes a sequencer or a microcomputer. The input board 9a inputs a signal from each of the measurement devices 3 to 7 and converts it into a digital signal, a storage device 9b for storing a program and data related to this control, An arithmetic processing unit 9c that arithmetically processes each signal digitally converted by the input board 9a based on the program, and an output board 9d that outputs a control signal to the slide control device 8 based on the arithmetic result of the arithmetic processing unit 9c.
[0022]
Next, the operation of this embodiment will be described based on the flowchart shown in FIG.
First, the measured values of the workpiece temperature, workpiece hardness, workpiece dimensions, and mold temperature before processing are input from the measuring devices 4 to 7 (step S1).
Then, based on each data (refer FIGS. 3-6) which shows the relationship between the workpiece | work temperature before a process, workpiece | work hardness, a workpiece | work dimension (workpiece thickness), and mold | die temperature and a product dimension (thickness of the product 11a). A bottom dead center clearance for obtaining a target product dimension is obtained from each measurement value input in S1 (step S2, bottom dead center clearance calculating means). Each data is preset in the storage device 9b before the press is activated.
[0023]
Subsequently, a correction amount for correcting the bottom dead center position of the slide 2a is obtained from the amount of deviation between the bottom dead center clearance calculated in step S2 and the current bottom dead center clearance (step S3, correction amount calculation means). Then, a correction signal (control signal) corresponding to the correction amount is output to the slide control device 8 (step S4).
[0024]
The slide control device 8 receives the correction signal output from the die height control device 9, receives the correction signal from the die height control device 9, and temporarily stops the operation, and rotates the slide adjustment motor of the press machine 2 for a certain period of time. The bottom dead center position is adjusted (step S5).
[0025]
In this way, by adjusting the bottom dead center position of the slide 2a based on the workpiece temperature, workpiece hardness, workpiece dimension, and mold temperature before processing that greatly affects the product dimensional accuracy, the change of the workpiece lot and the previous process are performed. Even when the hardness and dimensions of the workpiece 11 are changed due to a change in the mold lot, etc., or even when the mold temperature of the press machine 2 and the temperature of the workpiece 11 change to a steady state after lunch break or in the morning, etc. Can be press-molded with the best bottom dead center clearance.
[0026]
As a result, in the present embodiment, as shown in FIG. 7, it is possible to increase the accuracy (stabilization) of the product dimensions, and to adjust the bottom dead center clearance as the accuracy of the product dimensions increases, Since the product inspection and the post-process (for example, cutting) of the product 11a are not required, cost reduction can be expected by reducing labor costs, processing costs, and material costs.
[0027]
In the control system of the present embodiment, by measuring the product dimensions after molding and combining with the method of controlling the bottom dead center clearance of the press machine 2 based on the measured value (see Japanese Patent Laid-Open No. 4-313500). It is possible to absorb variations in product dimensions due to factors other than the above factors (workpiece temperature before machining, workpiece hardness, workpiece dimensions, and mold temperature), and it is possible to achieve further improvement in dimensional accuracy. .
A factor that greatly affects the product dimensions is the manufacturing accuracy of the mold. This can be dealt with by measuring the dimensions before attaching the mold and correcting the zero point in advance.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a forging apparatus.
FIG. 2 is an operation flowchart of this embodiment.
FIG. 3 is a measurement graph showing a relationship between a workpiece temperature before processing and product dimensions.
FIG. 4 is a measurement graph showing the relationship between workpiece hardness before processing and product dimensions.
FIG. 5 is a measurement graph showing a relationship between a workpiece dimension before processing and a product dimension;
FIG. 6 is a measurement graph showing the relationship between the mold temperature of the press and the product dimensions.
FIG. 7 is a graph showing the effect of this example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Forging apparatus 2 Press machine 2a Slide 2b Upper mold | type (mold)
2c Lower mold (mold)
4 Work temperature measuring device (material information measuring means)
5 Work hardness measuring device (material information measuring means)
6 Workpiece dimension measuring device (material information measuring means)
7. Mold temperature measuring device (Press machine information measuring means)
8 Slide control device (bottom dead center position adjustment means)
9 Die height control device (bottom dead center clearance calculation means, correction amount calculation means)
11 Workpiece (material)

Claims (6)

a) a press machine that presses the material into a predetermined product size in accordance with the stroke movement of the slide;
b) material information measuring means for measuring information (physical quantity representing the state of the material) of the material before processing that affects the product dimensions;
c) Necessary for obtaining a target product dimension from the measured value of the material information measuring means based on the relationship between the bottom dead center clearance of the press and the product dimension corresponding to the information of the material before processing. Bottom dead center clearance calculating means for calculating the bottom dead center clearance,
d) correction amount calculating means for calculating a correction amount for correcting the bottom dead center position of the slide based on the bottom dead center clearance calculated by the bottom dead center clearance calculating means;
e) A forging apparatus provided with bottom dead center position adjusting means for adjusting the bottom dead center position of the slide based on the correction amount calculated by the correction amount calculating means. a) a press machine that presses the material into a predetermined product size in accordance with the stroke movement of the slide;
b) material information measuring means for measuring information of the material before processing that affects the product dimensions;
c) press information measuring means for measuring information of the press affecting the product dimensions;
d) Necessary for obtaining a target product dimension from the measured value of the material information measuring means based on the relationship between the bottom dead center clearance of the press machine and the product dimension corresponding to the material information before processing. First bottom dead center clearance calculating means for calculating a clear bottom dead center clearance;
e) Necessary for obtaining a target product dimension from the measured value of the press machine information measuring means based on the relationship between the bottom dead center clearance of the press machine and the product dimension corresponding to the information of the press machine. A second bottom dead center clearance calculating means for calculating bottom dead center clearance;
f) A correction amount for correcting the bottom dead center position of the slide is calculated based on the respective bottom dead center clearances calculated by the first bottom dead center clearance calculating means and the second bottom dead center clearance calculating means. Correction amount calculating means;
g) A forging apparatus provided with bottom dead center position adjusting means for adjusting the bottom dead center position of the slide based on the correction amount calculated by the correction amount calculating means. The forging apparatus according to claim 1 or 2 , wherein the measurement by the material information measuring means is performed at every processing or at certain intervals. The forging apparatus according to claim 2, wherein the measurement by the press machine information measuring unit is performed at every processing or at certain intervals. The forging apparatus according to claim 1 or 2 , wherein the material information is at least one of a temperature of the material, a hardness of the material, and a dimension of the material. The forging apparatus according to claim 2 , wherein the press information is a temperature of a die of the press.

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