JP2009156698A - Inter-type distance measuring device - Google Patents

Abstract

An inter-type distance measuring apparatus capable of accurately measuring a distance between molds in a harsh environment and storing the measured distance between molds as a production record.
An inter-mold distance measuring device for measuring a distance between upper and lower molds of a mold composed of an upper mold and a lower mold, the displacement sensor measuring a distance between the upper and lower molds. The displacement sensor 2 is housed, and the sensor protection unit 4 embedded in one of the upper and lower molds 3 and 6 and the sensor protection unit 4 are provided to cool the displacement sensor 2. Means 7 and a deposition preventing mechanism 5 that removes foreign matter deposited on the displacement sensor 2 by air purge.
[Selection] Figure 1

Description

  The present invention relates to an inter-mold distance measuring apparatus that accurately measures an inter-mold distance of a mold.

  In the hot forging press, the work itself is heated to form in order to reduce the deformation resistance of the work, so that the periphery of the mold is in a considerably high temperature state. Therefore, in the die of a press machine having an upper die and a lower die, the bottom dead center of the upper die is displaced due to the influence of temperature, and the distance between the upper and lower die is changed. In particular, the hot forging press performs molding in a harsh environment as described above, and it is extremely difficult to directly measure the distance between molds by installing a measuring device such as a displacement sensor in the mold. Since it is difficult, forging is currently performed without directly measuring the distance between the molds.

  For example, as described in Patent Document 1, the bottom dead center or the top dead center of a slide changes depending on the temperature change of the press machine, for example, as described in Patent Document 1 In such a case, a mechanism that measures them and a mechanism that improves the accuracy of the product dimensions by correcting the bottom dead center of the slide with a hydraulic jack are known.

  In addition, the thermal displacement avoidance method and the thermal displacement avoidance device described in Patent Document 2 are provided in the electric servo press by providing a heat-blocking partition wall to generate heat from the drive motor (servo motor) during processing and press drive. Displacement of the die height (distance from the upper surface of the bolster to the lower surface of the slide) due to frictional heat at each part is avoided.

In addition, the actual displacement measuring method of the hot press apparatus described in Patent Document 3 has a distortion characteristic under a hot load in advance in order to accurately measure the displacement by excluding the mechanical and thermal influences of the apparatus. A correction value is obtained using a known sample, and the displacement of the press cylinder is corrected by this correction value.
Japanese Patent No. 2554176 JP 2003-260597 A Japanese Patent Laid-Open No. 7-236999

  However, the apparatus and the correction method described in Patent Document 1 correct the bottom dead center displacement of the slide by a displacement sensor and a hydraulic jack as a mechanism for improving the accuracy of the product dimensions. It is not intended for use under severe conditions where the temperature of the workpiece such as a press is extremely high. That is, the apparatus described in Patent Document 1 is premised on use in a cold press, and is not intended for use under conditions in which a measurement environment such as a hot forging press is severe. In other words, the device for measuring the distance between molds described in Patent Document 1 is a sensor output drift (or damage to the sensor main body due to exposure to a high temperature environment) due to temperature fluctuations around the sensor, lubrication mist / oxide scale. It is not a measurement device that assumes the effect of accumulation of (work surface is oxidized and peeled) and use in a pinch, but the measurement environment for forming a forged product at a high temperature such as a hot forging press is severe. Cannot be used under certain conditions.

  Furthermore, the apparatus and the correction method described in Patent Document 1 use a simple jig (a bracket 10A described in Patent Document 1) in which an L-shaped angle is externally attached to the periphery of the upper and lower molds. Because of this structure, errors in installation are likely to occur, and the structure is easily damaged. Furthermore, since the distance between the molds is not directly measured, if the mold expands or bends due to heat, the measurement error becomes further larger. In other words, since the distance between the slide (upper mold) and the bolster (lower mold) is measured by an external jig, sufficient measurement accuracy cannot be obtained. Therefore, there is a demand for a measuring device that can measure an accurate distance between molds by directly measuring the distance between molds.

  In addition, the method and apparatus described in Patent Document 2 mainly suppresses the displacement of the die height (distance between molds) itself due to the heat generated by the servo motor, and generates heat generated during the hot forging press described above. In comparison, since the heat is generated at a considerably low temperature, a method and an apparatus for avoiding this can be devised relatively easily.

  Moreover, the actual displacement measuring method of the hot press apparatus described in Patent Document 3 is to measure the displacement of the cylinder rod by attaching a displacement sensor to the cylinder rod of the hydraulic cylinder. It does not measure distance directly.

  In addition, conventional press machines do not have a function to detect the distance between molds of each molding shot using a trigger for each molding shot and store the distance between the molds as production record data. I could not.

  The present invention has been made in view of the above problems, and can accurately measure the distance between molds in a harsh environment and can store the measured distance between molds as a production record. Providing equipment.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in claim 1,
An inter-mold distance measuring device that measures the distance between upper and lower molds of an upper mold and a lower mold,
A displacement sensor for measuring a distance between the upper and lower molds;
A sensor protector that houses the displacement sensor and is embedded in one of the upper and lower molds;
A cooling means provided in the sensor protection unit for cooling the displacement sensor;
An accumulation preventing mechanism for removing foreign substances accumulated on the displacement sensor by air purge.

In claim 2,
The cooling unit is an air supply unit that supplies air into the sensor protection unit to cool the displacement sensor.

In claim 3,
The air supplied into the sensor protection unit is used for the air purge.

In claim 4,
A temperature sensor disposed in the vicinity of the displacement sensor for detecting the temperature in the sensor protection unit;
An amplifier connected to the displacement sensor, to which a measurement output corresponding to the distance between the molds is input from the displacement sensor;
Correction means for correcting the measurement output input to the amplifier when the temperature detected by the temperature sensor is equal to or higher than a predetermined temperature.

In claim 5,
Using the signal of the press control means for controlling the opening and closing of the mold or the measurement output signal of the displacement sensor as a trigger, the amplifier calculates the measured distance between molds for each molding shot based on the measurement output obtained from the displacement sensor. And a recording device for storing the measured value,
Display means for displaying a measured value of the distance between molds for each molding shot.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, it is possible to measure the distance between the molds even under a high temperature environment with almost no influence of the temperature.

  In claim 2, the cooling means can be configured simply.

  According to a third aspect of the present invention, the air used for cooling the displacement sensor is jetted as air purge air, thereby preventing the accumulation of lubricating mist, oxide scale, etc. that affect the measured value.

  According to the fourth aspect, since the influence of the measurement output of the displacement sensor due to the temperature change can be corrected, it is possible to accurately measure the distance between the molds even for the temperature change outside the assumed region.

  According to the fifth aspect of the present invention, the distance between the molds for each molding shot can be measured and stored as a production record so that the product and manufacturing conditions can be linked.

Next, embodiments of the invention will be described.
FIG. 1 is a schematic diagram showing an overall configuration of an inter-type distance measuring apparatus according to the present invention, FIG. 2 is a diagram showing an example of bottom dead center detection and record storage of an upper mold, and (a) is raw waveform data and hold. The figure which shows an output value, (b) is a time chart which shows the signal from a press control means, (c) is a time chart which shows a hold signal, (d) is a time chart which shows a data output signal.
In addition, in this embodiment, although the example which applied the inter-die distance measuring device 1 which is this invention to a hot forging press machine is demonstrated, it does not specifically limit, The press which has the metal mold | die which consists of an upper and lower die It can be widely applied to machines.

First, the overall configuration of the inter-mold distance measuring apparatus 1 according to the present invention will be described with reference to FIG.
The inter-die distance measuring device 1 is a distance between upper and lower molds (a gap between the upper die 3 and the lower die 6) of a die composed of an upper die 3 and a lower die 6 provided in a hot forging press. ) For measuring the distance between the molds, which houses the displacement sensor 2 and is embedded in one of the upper and lower molds 3 and 6, and the sensor protection unit 4 includes the sensor protection unit 4. A cooling means 7 for cooling the displacement sensor 2; an accumulation preventing mechanism 5 for removing foreign matter accumulated on the displacement sensor 2 by air purge; a temperature sensor 8 disposed in the vicinity of the displacement sensor 2; Amplifier 14, a server 25 which is a recording device, and a data display 16 which is a display means.

The displacement sensor 2 is an overcurrent displacement sensor, and as shown in FIG. 1, a plurality of displacement sensors 2 (four in this embodiment) are accommodated in each of a plurality of sensor protectors 4 described later. These are embedded in the vicinity of the four corners on the upper side of the lower mold 6 that has a rectangular parallelepiped shape. That is, in this example, four sensor protection units 4 that house the displacement sensors 2 are provided, and each sensor protection unit 4 is embedded in the vicinity of four corners on the upper side of the lower mold 6. Yes.
The upper end portion of the displacement sensor 2 is a sensor head portion 2a serving as an eddy current detection portion, and the lower end portion of the displacement sensor 2 is a cable connector portion 2b that connects a cable 11 having heat resistance. Each cable connector part 2b of the four displacement sensors 2 housed in each sensor protection part 4 protrudes outward from the lower part of the sensor protection part 4 and is connected to each cable connector part 2b. Each cable 11 is connected to one cable relay box 10 embedded in the lower mold 6. The cable relay box 10 is connected to a plurality of amplifiers 14, 14, 14, 14 (four in this embodiment) disposed in one amplifier box 13 via a cable 12 having heat resistance. Yes. That is, each of the four displacement sensors 2 described above is connected to each amplifier 14, 14, 14, 14 via the cable 11, the cable relay box 10, and the cable 12. And each amplifier 14,14,14,14 is connected to the data display 16 mentioned later via the data transmission cable 15 which has heat resistance, or the wireless transmission apparatus which is not shown in figure. The amplifiers 14, 14, 14, 14 are connected to a press control means 23 (described later) via a hold signal controller 24 (described later). Further, the displacement sensor 2 can send a measurement output signal corresponding to the distance between the molds to the amplifier 14.
In addition, although the sensor protection part 4 which accommodated the displacement sensor 2 was embed | buried in the lower mold | type 6 of a metal mold | die, it does not specifically limit, It is good also as a structure embed | buried in the upper mold | type 3 of a metal mold | die.

In addition, the measurement object 17 detected by the displacement sensor 2 (which uses SS400 steel material in this embodiment) is provided at the four corners on the lower side of the upper mold 3 and the sensors of the displacement sensors 2. The head portion 2a is disposed opposite to the head portion 2a.
In this embodiment, as the displacement sensor 2, an eddy current type displacement sensor 2 in which the sensor head portion 2a serving as a displacement detection portion of the measurement object 17 is small and is suitable for being embedded in a mold. However, the present invention is not particularly limited, and various sensors that can measure the distance without contact may be used. However, even a non-contact displacement sensor is not suitable for use as a displacement sensor according to the present invention. This is because the laser displacement sensor has a larger sensor head portion than the eddy current displacement sensor, and therefore it is necessary to secure a large space for embedding in the mold. Furthermore, since the laser displacement sensor needs to irradiate the measurement target with laser light, it is necessary to provide an opening or a transparent window part through which the laser light passes on the mold surface (opposite surface of the measurement target). This is because it is not suitable for use as the displacement sensor 2 according to the present invention. Of course, since the contact type displacement sensor is used with one end of the sensor exposed to the mold surface (opposite surface of the object to be measured), it is difficult to use in a severe high temperature environment. It is unsuitable for a hot forging press as shown in FIG.

  Further, the measurement object 17 of the displacement sensor 2 is arranged at the corner of the upper mold 3, but there is no particular limitation, and the mold body (metal) is not arranged without intentionally arranging the measurement object 17. May be configured as a measurement object of the displacement sensor 2. That is, the mold may be directly measured by the displacement sensor 2. Further, when the eddy current type displacement sensor 2 is used as in the present embodiment, the material composition of the measurement object 17 is a distance between molds if a copper material is used instead of the iron used in the present embodiment. It is possible to further improve the measurement accuracy. Moreover, as a material composition of the measurement object 17, aluminum, stainless steel, or the like can be used.

  Further, a thermocouple is provided as a temperature sensor 8 in the vicinity of each displacement sensor 2. Each temperature sensor 8 is connected to the cable relay box 10 via each cable connector portion 2b and each cable 11 like each displacement sensor 2, and an amplifier is connected from the cable relay box 10 via the cable 12 to the amplifier. It is connected to each amplifier 14, 14, 14, 14 in the box 13. As shown in FIG. 1, each of the temperature sensors 8 is provided in the vicinity of the displacement sensor 2, so that it is possible to measure the temperature inside the sensor protection unit 4 described later. When it is determined by a control unit (not shown) in each amplifier 14 that the temperature in the sensor protection unit 4 detected by the temperature sensor 8 exceeds a predetermined temperature, the temperature is stored in advance in the control unit in each amplifier 14. Based on the reference data for temperature correction, the temperature correction (temperature drift correction) of the measurement output value (measurement output voltage corresponding to the distance between molds) sent from the displacement sensor 2 is performed, and the distance between the molds The configuration is such that accurate measurement values can be obtained. That is, the above-described configuration constitutes a correction unit that corrects the measurement output input from the displacement sensor 2 to the amplifier.

As shown in FIG. 1, the sensor protection unit 4 has a box shape (a rectangular parallelepiped box in this embodiment) and is formed of a heat-resistant resin (for example, a peak material). The displacement sensor 2 is accommodated in each of a plurality of sensor protection parts 4 (four in this embodiment) so that the sensor head part 2a is located on the upper side, and the upper part of the sensor head part 2a of the displacement sensor 2 is covered. The sensor head portion 2a is covered with the portion 4a so that the sensor head portion 2a is not directly exposed on the upper surface of the lower die 6, and is embedded in the vicinity of the four corners of the lower die 6 (inside the lower die 6). In addition, a plurality of air purge holes 18 (two in each sensor protection portion in this embodiment), which will be described later, are opened at the top of each sensor protection portion 4. An air supply port 19 is opened on one side of each sensor protection unit 4, and the air supply port 19 is connected to an air supply pipe (not shown) that is piped inside the lower mold 6.
In addition, although each said sensor protection part 4 was formed in the box (cuboid) shape, it does not specifically limit, The shape of a metal mold | die or a metal mold | die, or the shape and the magnitude | size of the displacement sensor 2 main body to be used are used. The shape may be changed as appropriate. For example, the sensor protection part 4 can be formed in a cylindrical shape according to the sensor shape, and can be configured to be embedded in the mold with a smaller volume. The material of the sensor protection unit 4 is not limited to heat-resistant resin, and a ceramic material or the like can also be used.

  The cooling unit 7 is an air supply unit that cools by supplying air, and the air supply unit includes the air supply pipe that communicates with the air supply port 19 and the air purge hole 18. Has been. Thus, the cooling air is supplied into the sensor protection unit 4 via the air supply pipe, so that the displacement sensor 2 body in the sensor protection unit 4 can be cooled by air cooling. In the present embodiment, as the cooling air, normal temperature air is supplied by the air supply means.

  The accumulation prevention mechanism 5 is configured such that the air cooled in the sensor protection unit 4 is exhausted from the air purge hole 18 described above, and thereby the lubricating mist and oxide scale accumulated on the displacement sensor 2 (in the vicinity of the upper part of the lid 4a). It is configured to make it possible to blow off and remove the foreign matter. That is, accumulation of foreign matters such as lubricating mist and oxide scale that affect the measured value of the distance between the molds by injecting air used for cooling in the sensor protection unit 4 from the upper part of the sensor protection unit 4 through the air purge hole 18. To prevent. In other words, by supplying air into the sensor protection unit 4, the cooling in the sensor protection unit 4 by the cooling means 7 and the removal of the foreign matter above the displacement sensor 2 by the deposition preventing mechanism 5 can be performed simultaneously. It is.

The data display 16 includes four display units 16a, 16a, 16a, and 16a, a digital data output terminal 21, and an analog data output terminal 22. The display units 16a, 16a, 16a, and 16a measure the distance between molds (bottom dead center of the upper mold 3) for each molding shot measured by the four displacement sensors 2 provided at the corners of the lower mold 6. The value can be displayed in real time.
Note that the data display 16 and the amplifier box 13 can be integrally configured by incorporating the above-described amplifier box 13 in the data display 16.

  As shown in FIG. 1, the server 25 serving as the recording device is connected to the digital data output terminal 21 or the analog data output terminal 22 (such as a personal computer, which is connected to the digital data output terminal 21 in this embodiment). Is). By connecting to the server 25, the measured value of the measured distance between the molds for each molding shot is collectively managed in the server 25 (the measured value of the measured distance between the molds for each molding shot is used as a production record). Storage, and data processing using the measured value).

  The press control means 23 is a control means for controlling the opening and closing of the upper and lower molds 3 and 6 provided in the press machine, and signals from the press control means 23 for each molding shot (refer to FIG. 2B). 3 is sent to a hold signal controller 24 described later.

  The hold signal controller 24 receives each molding shot signal from the press control means 23, and sends an ON or OFF hold signal to each of the amplifiers 14, 14, 14, and 14 as shown in FIG. To send.

In such a configuration of the inter-die distance measuring device 1, when forging a workpiece (about 1200 ° C.) heated at a high temperature by a hot forging press, the sensor protection unit 4 embedded in the corner portion of the lower die 6. In the vicinity, the temperature is high (about 300 ° C.), but the heat is shut off by housing the displacement sensor 2 by the sensor protection unit 4, and the cooling air is detected from the air supply port 19 through the air supply pipe. By supplying into the protection part 4, the inside of the sensor protection part 4 and the displacement sensor 2 main body are cooled. Then, the cooling air is discharged from the air purge hole 18 opened at the upper part of the sensor protection unit 4.
That is, the cooling air used to cool the inside of the sensor protection unit 4 and the displacement sensor 2 main body is discharged from the plurality of air purge holes 18 above the sensor protection unit 4, so that the upper side of the sensor head unit 2 a ( Lubrication mist or oxide scale that accumulates in the vicinity of the upper portion of the lid 4a and affects the sensor measurement value is blown away to prevent the accumulation of foreign matters. In this way, the influence of the heat transmitted from the workpiece and the mold heated to a high temperature is suppressed, and the output value of the displacement sensor 2 does not cause a temperature drift (in this embodiment, about 60 ° C. or less) in the sensor protection unit 4. Can be maintained.

Next, the case where the distance between the molds is continuously measured for each molding shot of the hot forging press will be specifically described with reference to FIG.
In this embodiment, the lower mold 6 is fixed, and the displacement of the bottom dead center of the upper mold 3 is measured as the distance between the molds. However, the measurement conditions for the distance between the molds are not particularly limited.
The graph shown in FIG. 2A shows a vertical axis obtained by converting an output value (voltage V) when measuring the distance between molds by the displacement sensor 2 into a displacement (mm) (output 1V corresponds to displacement 1 mm), and a horizontal axis. Is the time (s), and on this graph, raw waveform data (solid line), which is a measured output value corresponding to the distance between the molds of the displacement sensor 2, is shown. In this graph, the displacement is plotted on the graph from when the upper mold 3 descends and the displacement of the vertical axis of the graph becomes 10 mm or less. That is, when the bottom dead center of the upper mold 3 is larger than 10 mm, a constant value is maintained in the vicinity of 10 mm on the graph.

A control output unit (not shown) in each of the amplifiers 14, 14, 14, 14 has a measured output value corresponding to the distance between the molds from the corresponding displacement sensors 2, 2, 2, 2 (see FIG. 2 ( The raw waveform data shown in a) is sampled and input. As a timing when the upper die 3 starts to descend (a portion indicated by an arrow A in FIG. 2), a hold signal is triggered by a signal from the press control means 23 that the upper die 3 is lowered (a portion indicated by an arrow D in the time chart in FIG. 2B). The hold signal controller 24 sends a hold signal to each amplifier 14 in the amplifier box 13 using that as a base point. Based on this hold signal (ON signal of the arrow E portion in FIG. 2 (c)), the displacement is held for a certain time, and when the distance between the upper mold 3 and the lower mold 6 is the smallest, that is, the upper mold 3 The output is continued with the value at the bottom dead center as the hold output value (arrow B portion in FIG. 2A). Then, the bottom hold value at which the upper mold 3 becomes the bottom dead center (the part indicated by the arrow C in FIG. 2A) is detected as a measured value of the distance between the molds (displacement 6 mm in this embodiment). Then, in order to transmit this measurement value to the data display 16, a data output signal shown in FIG. 2D is transmitted to the data display 16. The measured values (bottom hold values) of the four mold distances are displayed on the display units 16a, 16a, 16a, and 16a of the data display unit 16 for each molding shot by the transmitted data output signal. The bottom hold value data of each molding shot is recorded and stored in the server 25 connected thereto. In addition, the measurement value of the distance between the molding shots of the upper and lower molds 3 and 6 displayed on the data display 16 can be confirmed in real time by the operator, so that it is immediately reflected in the molding conditions of the press machine. Thus, the molding conditions can be adjusted. In addition, the product and the measured value data of the distance between the molds at the time of molding the product can be linked using the server 25, and at the time of the molding process when the product is produced from a single product It is possible to easily trace all the transitions in the distance between molds. Further, the output signal of the displacement sensor 2 can be used as a trigger when the upper die 3 is lowered. That is, the production record archiving function of the inter-mold distance measuring device 1 of the present invention has the function of the bottom dead center of the upper mold 3 of each molding shot triggered by the signal of the press control means 23 or the output signal of the displacement sensor 2 itself. The value can be detected and stored as a production record in the server 25 which is a recording device, and the product and manufacturing conditions can be linked.
Further, the lower surface of the upper die 3 (the surface opposite to the upper surface of the lower die 6) with respect to the upper surface of the lower die 6 from each measured value of the distance between the molds measured by the displacement sensors 2 at the four corners. It is also possible to calculate the tilt angle.

  In this embodiment, the temperature in the sensor protection unit 4 is kept below a predetermined temperature at which the temperature drift of the measurement output of the displacement sensor 2 does not occur by the sensor protection unit 4 and the cooling means 7. Even when the temperature rises above a predetermined temperature, while the temperature sensor 8 senses that the temperature is higher than the predetermined temperature, the correction data corresponding to the temperature rise prepared in advance in the control unit in the amplifier 14 is used. Since the temperature influence is automatically corrected for the measured output value (output voltage value) of the displacement sensor 2, even when the sensor protection unit 4 is in an unexpected temperature range. It is possible to accurately measure the distance between the molds by correcting the measurement output. In other words, by correcting the influence of the measurement output due to the temperature change in the sensor protection unit 4, even if it reaches a temperature region that is hardly affected by the temperature even in the vicinity of the high-temperature workpiece and causes a temperature drift due to heat, The distance between the upper and lower molds 3 and 6 can be accurately measured.

  As described above, the inter-type distance measuring apparatus 1 for measuring the distance between the upper and lower molds of the mold composed of the upper mold 3 and the lower mold 6, the displacement sensor 2 for measuring the distance between the upper and lower molds 3 and 6, The displacement sensor 2 is housed, and the sensor protection unit 4 embedded in one of the upper and lower molds 3 and 6 and the sensor protection unit 4 are provided to cool the displacement sensor 2. By providing the means 7 and the deposition preventing mechanism 5 for removing foreign matter accumulated on the displacement sensor 2 by air purge, the mold is hardly affected by the temperature even in the vicinity of the hot workpiece of the hot forging press. The distance between molds can be measured. In the present embodiment, since the small eddy current type displacement sensor 2 is used, it can be embedded in an extra space in the mold. As a result, the measurement accuracy is remarkably improved as compared with a conventional measurement method using a slide bolster with a simple jig attached externally (see Patent Document 1).

  Further, since the cooling means 7 is an air supply means for cooling the displacement sensor 2 by supplying air into the sensor protection unit 4, the cooling means 7 can be configured simply.

  Further, by using the air supplied into the sensor protection unit 4 for the air purge, accumulation of lubricating mist and oxide scale that affects the measured value is prevented. Further, since it is not necessary to separately install an air supply pipe for air purge in the mold, the apparatus configuration can be simplified.

  A temperature sensor 8 that is disposed in the vicinity of the displacement sensor 2 and detects the temperature in the sensor protection unit 4 is connected to the displacement sensor 2, and a measurement output corresponding to the distance between the molds is input from the displacement sensor 2. And a correction means for correcting the measurement output input to the amplifier 14 when the temperature detected by the temperature sensor 8 is equal to or higher than a predetermined temperature. Since the influence of the measurement output can be corrected, it is possible to accurately measure the distance between the molds even for a temperature change outside the assumed region.

  Based on the measurement output obtained from the displacement sensor 2, the measured value of the distance between the molding shots based on the measurement output signal from the displacement sensor 2 using the signal of the press control means 23 for controlling the opening and closing of the mold or the measurement output signal of the displacement sensor 2 A server 25 that is a recording device that acquires the measured values and stores the measured values; and a data display 16 that is a display unit that displays measured values of the distance between molds for each molding shot. Thus, the value of the bottom dead center (distance between molds) of the upper mold 3 of each molding shot can be stored in the server 25 as a production record, and the product and manufacturing conditions can be linked. That is, quality control based on 100% inspection of products can be easily performed instead of quality control based on sampling inspection.

It is a schematic diagram which shows the whole structure of the type | mold distance measuring apparatus which concerns on this invention. It is a figure which shows the example of upper dead center detection and record storage, (a) is a figure which shows raw waveform data and a hold output value, (b) is a time chart which shows the signal from a press control means, (c ) Is a time chart showing a hold signal, and (d) is a time chart showing a data output signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inter-type distance measuring device 2 Displacement sensor 3 Upper mold 4 Sensor protection part 5 Deposition prevention mechanism 6 Lower mold 7 Cooling means 8 Temperature sensor 10 Cable relay box 11 (Heat resistant) cable 12 (Heat resistant) cable 13 Amplifier box 14 Amplifier 15 ( Heat-resistant) Data transfer cable 16 Data display 17 Measurement object 18 Air purge hole 19 Air supply port 21 Digital data output terminal 22 Analog data output terminal 23 Press control means 24 Hold signal controller 25 Server

Claims (5)

An inter-mold distance measuring device that measures the distance between upper and lower molds of an upper mold and a lower mold,
A displacement sensor for measuring a distance between the upper and lower molds;
A sensor protector that houses the displacement sensor and is embedded in one of the upper and lower molds;
A cooling means provided in the sensor protection unit for cooling the displacement sensor;
An inter-mold distance measuring apparatus, comprising: a deposition preventing mechanism that removes foreign matter deposited on the displacement sensor by air purge.   The inter-type distance measuring device according to claim 1, wherein the cooling unit is an air supply unit that supplies air into the sensor protection unit to cool the displacement sensor.   The inter-type distance measuring device according to claim 1 or 2, wherein air supplied into the sensor protection unit is used for the air purge. A temperature sensor disposed in the vicinity of the displacement sensor for detecting the temperature in the sensor protection unit;
An amplifier connected to the displacement sensor, to which a measurement output corresponding to the distance between the molds is input from the displacement sensor;
4. The apparatus according to claim 1, further comprising a correction unit configured to correct the measurement output input to the amplifier when a temperature detected by the temperature sensor is equal to or higher than a predetermined temperature. The inter-type distance measuring device according to item. Using the signal of the press control means for controlling the opening and closing of the mold or the measurement output signal of the displacement sensor as a trigger, the amplifier calculates the measured distance between molds for each molding shot based on the measurement output obtained from the displacement sensor. And a recording device for storing the measured value,
The inter-mold distance measuring device according to any one of claims 1 to 4, further comprising display means for displaying a measured value of the inter-mold distance for each molding shot.

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