JPH07266092A - Automatic measuring instrument for molding of automatic powder molding machine - Google Patents

Abstract

PURPOSE:To make quality control extremely easy by outputting the signal of actual measurement height of a molding, outputting a molding stop signal in the event of abnormality and displaying the actually measured height of this molding. CONSTITUTION:A die 2 is built into a table 1 and raw material powder is packed into its molding hole 3. The molding 10 is press molded by upper and lower mold punches 5, 4. A sensor 11 is installed to the upper mold punch 5 and the height h of the bottom dead center is detected. The detection signal 11a corresponding to the molding height of the molding 10 is outputted. The detection signal 11a is inputted and calculated by a controller 12 and an actually measured height signal 12a is compared with the standard height tolerance range of the molding 10. The molding stop signal 12b is outputted in the event of the abnormality. The actually measured height signal is inputted by a display device 13 and the actually measured height H of the molding 10 is displayed. As a result, man power is saved and the productivity, quality accuracy and reliability are greatly improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for continuously press-molding powder compacts when relatively small chips such as circular saw chips and tire spike chips are manufactured. The present invention relates to a preferable apparatus for automatically measuring a molded body of an automatic powder molding machine.

[0002]

2. Description of the Related Art An automatic powder molding machine (press) is usually a die having a molding hole built in a table, and a fixed amount of raw material powder filled in the molding hole into a molded body having a fixed shape. In the case of pressure molding, which has a powder molding mechanism including a lower punch and the like, and relatively small chips are pressure-molded as described above, for example, raw material powder (WC powder, Co
Powder, or a cemented carbide material in which TiC powder, TaC powder, etc. are mixed at a predetermined ratio). That is, the raw material powder is quantitatively filled in the forming hole of the die, and the inside of the forming hole is
Repeat the molding process by press-molding into a regular molded body with the lower die punch, and then removing this molded body by taking out a predetermined amount from the large number of continuously pressure-molded molded bodies. (Weight and height), the molded body is sintered to produce a cemented carbide chip material.

[0003]

Conventionally, when a raw material powder is pressure-molded into a molded body by an automatic powder molding machine, usually,
As described above, after continuously pressure-molding a molded body, since a predetermined amount is sampled and inspected from a large amount of the molded body to perform quality control, a lot of labor and time are required for the inspection. There are issues such as productivity and quality accuracy limitations.

The present invention was developed to address the above-mentioned problems, and the object of the present invention is to detect the height corresponding to the molding height of each molded body by a sensor. By displaying the measured height and automatically stopping the molding when the molding height is abnormal, we provide a compact body automatic measuring device of an automatic powder molding machine that saves labor and improves productivity, quality accuracy, and reliability. It is in.

[0005]

The present invention relates to a sensor attached to an upper die punch of an automatic powder molding machine for detecting the height position of bottom dead center and outputting as a detection signal corresponding to the molding height of a molded body. , The detection signal is calculated to the molding height of the molded body, the measured height value signal of the molded body is output, and it is compared with the standard height tolerance value of the molded body and the molding stop signal is output in the event of an abnormal molding. By having a controller that automatically stops and an indicator that displays at least the measured height of the molded body based on the measured height signal, the molding height of each molded body that is continuously pressure-molded can be displayed. Automatically measure, display the measurement result and automatically stop the molding when the molding height is abnormal,
We have improved productivity and quality accuracy as well as labor saving.

Further, by configuring the above sensor as an eddy current type mutation sensor, detection accuracy and reliability are further enhanced.

[0007]

In the automatic powder molding machine, the raw material powder filled in the molding holes of the die incorporated in the table is continuously pressure-molded in the molding holes by the upper and lower die punches. The height is detected by the height of the table at the bottom dead center of the sensor that moves up and down together with the upper die punch, and this detection signal is calculated by the controller and the measured height signal of each molded body and the standard height of the molded body are detected. It is output as a molding stop signal at the time of abnormality compared to the tolerance range, this measured height signal is displayed as the measured height of each molded body on the display, and pressure molding is automatically performed when the molding height of the molded body is abnormal. Stopping automatically, the molding accuracy as well as the filling amount of the raw material powder of each molded body is automatically measured and grasped with high accuracy for each pressure molding by the above detection, and by the eddy current mutation sensor. The detection accuracy and reliability are further improved by the output, and it is possible to select and readjust defective products at any time, which makes quality control significantly easier, and labor-saving as well as excellent productivity, quality accuracy, and reliability are achieved. can get.

[0008]

1 to 3 show an embodiment of the present invention.
In the figure, 1 is a table of an automatic powder molding machine, 2 is a die having a molding hole 3 incorporated in the table 1, 4 is a lower die punch arranged below the die 2 and vertically controlled in the molding hole 3, 5
Is an upper die punch which is arranged above the die 2 and which is vertically controlled to move into and out of the molding hole 3, and 10 is formed by press-molding the raw material powder in the molding hole 3 by the upper and lower die punches 5 and 4. A molded body, 11 is a sensor attached to the upper die punch 5 and outputs a detection signal 11a corresponding to the molding height H of the molded body 10 (eddy current displacement sensor), and 12 is a calculation by inputting the detection signal 11a. The measured height signal 12a of the molded body 10 is output and the molding stop signal 1 is output when the molded height H of the molded body 10 is abnormal.
2b and a controller that outputs an alarm signal 12c, 13
Is the measured height signal 12a input and at least each molded body 1
An indicator for displaying the measured height H of 0, 14 is an alarm signal 12
An alarm device such as a busher for issuing an alarm by inputting c, 15 is data pre-input to the controller 12, Ho is a standard height (set height) of the molded body 10, and H is a molding height of the molded body 10 ( (Measured height), α is above the standard height Ho of the molded body 10,
The lower limit tolerance value, h, is the distance between the sensor (eddy current displacement sensor) 11 and the table 1 at the bottom dead center, that is, the height.

In the embodiment shown in FIG. 1, a raw material powder is filled in a molding hole 3 of a die 2 incorporated in a table 1 and vertically controlled, and a molding die 10 is formed by a lower die punch 4, 5. In the automatic powder molding machine, a sensor 11 attached to the upper die punch 5 for detecting the height h of the bottom dead center and outputting a detection signal 11a corresponding to the molding height H of the molded body 10, and the detection signal 11a The measured height signal 12a of the molded body 10 is input and calculated, and the measured height signal 12a of the molded body 10 is output.
A controller 12 that outputs a molding stop signal 12b when an abnormality occurs in comparison with a standard height tolerance range Ho ± α of 0, and a display that displays at least the measured height H of the molded body 10 by inputting the measured height signal 12a thereof. And an automatic powder molding machine equipped with a container 13.

In the molded body automatic measuring device in the above-mentioned automatic powder molding machine, the sensor 11 is attached to the upper die punch 5 and detects the height h of the die 2 and the table 1 at the bottom dead center to perform molding. The eddy current displacement sensor 11 outputs a detection signal 11a corresponding to the molding height H of the body 10, and is an automatic molded body measuring device for an automatic powder molding machine.

More specifically, in the above automatic powder molding machine, a table 1 incorporating a die 2 having a molding hole 3 as shown in FIG. 1 and a filling mechanism for filling the molding hole 3 with a fixed amount of raw material powder ( (Not shown), a lower die punch 4 arranged below the table 1 and vertically controlled by an appropriate means, and a support member 7 fixed to the vertical drive shaft 6 and mounted on the table 1
An automatic molding mechanism including an upper die punch 5 and the like arranged on the upper side of the above and vertically controlled by an appropriate means is provided. For example, when molding a relatively small molded body 10 as described above, this molded body is used. A die 2 having a molding hole 3 having a cross-sectional shape corresponding to 10 is incorporated into a table 1, upper and lower die punches 4 and 5 are made to correspond to the cross-sectional shape of the molding hole 3, and a controller of an automatic powder molding machine (not shown) is provided. ) Upper and lower punch 4,
5 is adjusted in advance such as the vertical stroke and the filling amount of the raw material powder, and is set and operated so that the molding height H of the molded body 10 becomes the standard height Ho. The raw material powder is quantitatively filled in the lower die punch 4 as shown by the arrow X, the upper die punch 5 descends into the forming hole 3, and the raw material powder is shaped together with the lower die punch 4 at a predetermined pressure in a predetermined shape.
After press molding, the upper die punch 5 rises above the table 1, and the lower die punch 4 rises to form the compact 1 in the molding hole 3.
0 is die-cut on the table 1, and the molded body 10 is carried out by an appropriate transfer means (not shown) to be received on a carbon plate for sintering (not shown), which is a continuous molding step. By repeating this, a large amount of the molded body 10 is pressure-molded. The molded body 10 is placed in a sintering furnace (not shown) using a carbon plate for sintering and is sintered.

In addition, in the molded body automatic measuring device attached to the above-mentioned automatic powder molding machine, the sensor 11 attached to the supporting member 7 of the upper die punch 5 through the bracket 8 and the controller 12 connected to the sensor 11 are connected. And the controller 12
The display device 13 and the alarm device 14 and the like are arranged in series.
This sensor 11 is preferably constituted by an eddy current displacement sensor 11, and this eddy current displacement sensor 11
Is vertically controlled together with the upper die punch 5 to measure the height (distance) h of the table 1 at the bottom dead center (detected by voltage). That is, the height h with respect to the table 1 is properly detected with high accuracy, and the height h is output as a detection signal 11a corresponding to the molding height H of each molded body 10.

Further, the controller 12 is connected to a sensor (eddy current type displacement sensor) 11, and the standard height (set height) Ho of the molded body 10 is set in accordance with the above-mentioned setting of the automatic powder molding machine. And data 15 such as the upper limit tolerance value + α and the lower limit tolerance value −α are input in advance, the detection signal 11a for each molded product 10 is input and calculated, and the actual measured height H of the molded product 10 is converted. In addition to outputting the height signal 12a (digital signal), the molding height H, that is, the actually measured height signal 12a is compared with the standard height tolerance range Ho ± α of the molded body 10 and an abnormal value exceeding that range is obtained. Then,
The molding stop signal 12b and the alarm signal 12C are output. The molding stop signal 12b is input to a controller (not shown) of the automatic powder molding machine to automatically stop the molding operation.

Further, the display 13 is the controller 12
And the standard height (set height) Ho of the molded body 10 and the standard height tolerance range Ho ± α thereof together with the molded height H of each molded body 10 are input. Print and display. The alarm device 14 is connected to the controller 12 and has a structure for inputting an alarm signal 12C and issuing an alarm such as a buzzer.

The molded body 10 which is pressure-molded by the automatic powder molding machine as described above is molded by the sensor (eddy current displacement sensor) 11 which moves up and down together with the upper die punch 5 for each pressure molding. The height h of the bottom dead center corresponding to the height H is detected, and the detection signal 11a is calculated by the controller 12 to obtain the measured height signal 12 of the molded body 10.
is displayed on the display 13 as a and the molded body 10
When the actual molding height H of the molded body 10 exceeds the above range as compared with the standard height tolerance range Ho ± α, the molding stop signal 12b and the alarm signal 12c are output to automatically perform the molding. Since it is stopped automatically and an alarm is issued, the molded body 10
For each time, the actual molding height H can be easily and accurately grasped, and when abnormalities occur, automatic control of molding is performed, and defective products are taken out or readjusted by an alarm, which facilitates quality control.

In the molded body 10 which is additionally molded by the above-mentioned automatic powder molding machine, its cross-sectional shape is accurately formed by the molding hole 3 of the die 2, and the lower die punch 4 at the time of molding is located in the lower part of the molding hole 3. Since the upper punch 5 is set to press-mold the molded body 10 at a predetermined pressure without controlling the fixed position of the upper punch 5 and the bottom dead center of the upper punch 5 changes due to excess or deficiency of the raw material powder. (Refer to FIG. 3), by detecting the forming height H of each formed body 10, a sensor that accurately measures variations in shape as well as excess or deficiency of the raw material powder, and moves up and down together with the upper die punch 5 (eddy current displacement sensor). The height h with respect to the table 1 at the bottom dead center of 11 is a value that exactly corresponds to the actual molding height H of each molded body 10, and the eddy current displacement sensor 11 detects the height h. Higher accuracy and reliability Elevated, molded body 1 is continuously molded
The shape is automatically detected with high accuracy every 0, and the actual molding height value H of each molded body 10 is displayed. In addition, when the molding is stopped automatically, a warning is given to select and readjust defective products. This enables quality control, which is extremely easy and labor-saving, and provides excellent productivity as well as quality accuracy and reliability.

In the above embodiment, the controller 12 of the automatic molded body measuring apparatus is implemented in various circuits having various arithmetic functions by the conventional technique, and this arithmetic function is used in the controller of the automatic powder molding machine. It is also possible to combine this controller with the above controller. Further, a defective product discharging mechanism (not shown) is provided on the upper side of the table 1, and the discharging mechanism is controlled by the molding stop signal 12b so that the molded product detected as the defective product is automatically removed from the table when the mold is removed. It is also possible to discharge it and take it out.

[0018]

As described above, according to the present invention, in the automatic powder molding machine, the raw material powder filled in the molding hole of the die incorporated in the table is continuously fed into the molding hole by the upper and lower die punches. The molding height of each pressure-molded body is detected by the height with the table at the bottom dead center of the sensor that moves up and down together with the upper die punch, and this detection signal is calculated by the controller and each molding The measured height signal of the body and the measured height signal are compared with the standard height tolerance range of the molded body and output as a molding stop signal when there is an abnormality, and this measured height signal is displayed as the measured height of each molded body on the display. When it is displayed and the measured height of the molded body is abnormal, the pressure molding is automatically stopped, the molding precision is automatically grasped with high accuracy for each pressure molding of each molded body, and the eddy current type mutation For detection by sensor Detection accuracy and its reliability are further improved, and defective products can be selected and readjusted at any time, making quality control significantly easier, and labor-saving as well as productivity, quality accuracy, and reliability are significantly improved. ing.

[Brief description of drawings]

FIG. 1 is a mechanism diagram showing an embodiment of the present invention.

[Figure 2] Operation diagram of the controller

FIG. 3 is a vertical stroke diagram of an upper die punch.

[Explanation of symbols]

1 Table 2 Die 3 Molding Hole 4 Lower Punch 5 Upper Punch 10 Molded Body 11 Sensor, Eddy Current Displacement Sensor 11a Detection Signal (Molded Body) 12 Controller 12a Measured Height Signal (Molded Body) 12b Molding Stop Signal 13 Display Container h Height of bottom dead center, height with table with die (sensor) H Forming height, measured height (molded body) Ho ± α Standard height tolerance range (molded body)

Claims (2)

[Claims] 1. An automatic powder molding machine in which raw material powder is filled in a molding hole of a die incorporated in a table and vertically controlled, and in an automatic powder molding machine for press-molding a molded body by a lower die punch, the die is attached to the upper die punch. A sensor that detects the height of the dead point and outputs a detection signal corresponding to the molding height of the molded body, and inputs and calculates the detection signal to output the measured height signal of the molded body and the measured height. The controller includes a controller that outputs a molding stop signal when an abnormality occurs by comparing the height signal with a standard height tolerance range of the molded body, and an indicator that inputs the measured height signal and displays the measured height of the molded body. The automatic molded body measuring device of the automatic powder molding machine, which is characterized in that 2. The automatic molded body measuring device for an automatic powder molding machine according to claim 1, wherein the sensor is attached to the upper die punch to detect the height of the die-attached table at the bottom dead center and An automatic molded body measuring device for an automatic powder molding machine, which is configured with an eddy current displacement sensor that outputs a detection signal corresponding to the molding height.