JP6931150B2 - Temperature measuring device - Google Patents

Description

The present invention relates to a wireless communication type temperature measuring device capable of measuring the tool cutting edge temperature in real time during machining of a lathe device.

In general, in a lathe device, if the cutting edge temperature of the tip of an outer diameter tool provided on the turret rises excessively or the cutting edge wears, the machining accuracy of the workpiece (workpiece) may decrease. On the other hand, at the actual machining site, the machining is stopped each time to measure the cutting edge temperature or to check the degree of wear of the cutting edge, or to set machining conditions that ensure that the temperature does not rise excessively, or regularly. Measures such as replacing the cutting edge were taken. Further, although a coolant is often used to prevent the tool temperature from rising during cutting, there is also a problem that it is difficult to maintain and guarantee the tool temperature during the machining process even if the coolant is used.

In order to solve this problem, it is possible to consider a method of providing a temperature sensor such as a thermoelectric pair in the tool, but in a lathe device, when the turret rotates when changing the tool, the lead wire connected to the temperature sensor breaks, so the temperature of the tool can be measured. was difficult.

On the other hand, in recent years, the applicant has developed a unit in which a semi-through hole is provided in a rotary tool such as a drill used for a cutting device or a rotary tool in friction stir welding, and a thermocouple is inserted into the rotary tool to wirelessly transmit temperature information to the outside. (See Patent Document 1 and Patent Document 2), and it was considered to utilize this as a tool for a lathe device.

However, when a replaceable cutting edge tip is attached to the tip of an outer diameter tool as a tool of a lathe device, it is difficult to utilize the above example of the rotary tool as it is in consideration of the shape of a thin plate and a small cutting edge tip. It was necessary to develop a temperature measurement method peculiar to the cutting edge tip.

International Publication WO2015-022967 International Publication WO2016-111336

The present invention has been created in view of such circumstances, and an object of the present invention is to provide a specific configuration capable of measuring the temperature of a tool cutting edge tip in real time during machining of a lathe device.

The temperature measuring device of the present invention provided to solve the above-mentioned problems is the temperature of a replaceable cutting edge tip provided at the tip of a cutting tool that slides in the radial direction of a turret that rotates in a lathe device that can slide in the axial direction. In a measuring device, the cutting edge tip is provided with a semi-penetrating temperature measurement hole in the thickness direction at which a surface on the outer diameter bite side opens at its substantially tip, and when the cutting edge tip is mounted on the outer diameter bite. A thermocouple is arranged in advance at a position facing the temperature measurement hole, and when the cutting edge tip is mounted, the tip of the thermocouple is inserted and positioned in the temperature measurement hole of the cutting edge tip to be inserted from the thermocouple. A temperature information transmitting means for receiving temperature information and wirelessly transmitting the temperature information to the outside is provided.

According to the temperature measuring device of the present invention, the temperature can be measured in real time during machining near the tip of the replaceable cutting edge tip (machining tip), so that it is necessary to stop the lathe device each time to measure the tool temperature. The temperature measurement in the machining process can be performed during the process operation. Therefore, it is possible to detect in detail the temperature, wear and tear of the cutting edge, etc. during the machining process of the tool, improve the machining accuracy, improve the product yield by controlling the timing of tool change, and eliminate waste in the manufacturing process. It is also advantageous in that it is possible to measure the temperature in the vicinity of the tip of the tip without changing the outer diameter tool when replacing the tip of the cutting edge.

Specifically, the tip of the thermocouple projects from the mounting side of the cutting edge tip of the outer diameter bite, and the connection terminal at the other end of the thermocouple is on the side opposite to the side on which the cutting edge tip is mounted. An example is described in which the temperature information transmitting means is connected to the provided terminal block and is electrically connected to the terminal block via a compensating lead wire.

In addition, by providing a temperature measuring device for multiple outer diameter tools mounted on the turret, there is no concern about disconnection because temperature information is acquired by wireless connection even when the turret is rotated and the tool is changed. , It is possible to measure the temperature continuously.

In addition, multiple cutting edge tips of the same shape with holes for temperature measurement with different depths are prepared, the temperature change over time from each thermocouple is measured under the same machining conditions, and the cutting edge tip and the workpiece are determined from the measurement results. It may be adopted to estimate the temperature of the contact position of.

Further, a temperature measuring device may be provided on the inner diameter bite instead of the outer diameter bite.

Further, it is preferable to fill the gap between the thermocouple and the temperature measuring hole of the cutting edge tip with a high thermal conductive adhesive.

Further, in this temperature measuring device, the temperature measuring device is arranged for each of the plurality of outer diameter cutting tools mounted on the turret, and the rotation of the turret using a tool including the plurality of outer diameter cutting tools. It is possible to obtain the temperature measurement result of each outer diameter tool during the rapid continuous machining.

This temperature measuring device can also be used when a plurality of tools such as outer diameter tools (and / or inner diameter tools) are attached to the turret, and the turret is rotated to perform continuous machining while exchanging tools. Specifically, during continuous machining, the turret is rotated to change tools, but in this measuring device, the temperature information from each outer diameter bite is wirelessly transmitted to the outside, so wiring as in the case of wired wiring. It is advantageous in that the problem of entanglement does not occur. Therefore, it is possible to measure the tip temperature of each outer diameter tool without continuously machining without stopping the lathe device every time the tool is changed.

Further, this temperature measuring device controls to stop the operation of the lathe device or relax the processing conditions of the lathe device when it detects that the temperature information from the thermocouple exceeds a preset threshold value or the amount of change. Is preferable.

In order to prevent wear and tear of the cutting edge tip, when a sign that the temperature of the cutting edge tip rises abnormally is detected, the machining conditions are automatically relaxed or the machining work is stopped to damage the work piece. It is also possible to prevent this from happening. In this case, in order to detect the symptom more accurately, it is particularly effective to memorize the abnormal temperature threshold value or the change mode of the symptom in the processing apparatus in advance.

According to the temperature measuring device of the present invention, the real-time temperature during machining near the tip of the replaceable cutting edge tip of the lathe device can be measured, so that it is not necessary to stop the lathe device and measure the tool temperature each time. Temperature measurement can be performed during process operation. Further, when exchanging the cutting edge tip, it is possible to measure the temperature in the vicinity of the tip of the cutting edge tip without exchanging the outer diameter bite.

(A) is a photographic diagram of a machining tip, and (b) is a photographic diagram of an outer diameter bite in which a thermocouple is attached to the machining tip of (a). The device configuration for externally transmitting the temperature data of the machining tip from the outer diameter bite on which the machining tip is mounted is shown. It is a block diagram of the electric signal from the thermocouple to the transmission to the external unit through the accommodating box of the temperature measured by the processing chip. It is a schematic sectional view of the depth position example of the thermocouple to be inserted into a processing tip. It is a graph which shows the measurement result of the temperature of the cutting edge tip at the machining time at each depth position, and the estimated temperature of the cutting edge tip at the machining time at the contact position with a member to be machined. It is a perspective view which shows the appearance that a plurality of outer diameter bites are attached to a turret.

<< Technical configuration of chip for addition >>
FIG. 1 (a) is a photographic diagram of the machining tip 10, and FIG. 1 (b) is a photographic diagram showing an outer diameter tool 16 in which the thermocouple 14 is mounted on the machining tip 10 of FIG. 1 (a). The machining tip 10 has a substantially parallelogram-shaped thin plate shape, and a through hole 13 for attaching to the tip of the outer diameter tool 16 is provided at the substantially center thereof. Further, the machining tip 10 is provided with a semi-penetrating thermocouple insertion hole (temperature measuring hole) 12 at a predetermined position positioned with respect to a corner portion serving as a cutting edge thereof.

The outer diameter tool 16 is provided with a machining tip mounting portion 16a capable of supporting the machining tip 10 at the tip on the cutting edge side, and the thermocouple 14 is fixed in advance at a position facing the temperature measuring hole 12 of the machining tip 10. (See Fig. 1 (b)). In this state, the surface (thermocouple side surface 10a) provided with the thermocouple insertion hole 12 in FIG. 1A faces the processing tip mounting portion 16a, and the machining tip 10 is mounted. Therefore, since the thermocouple 14 is fixed to the outer diameter tool 16, the thermocouple 14 does not need to be replaced when the machining tip 10 is replaced.

In addition, the outer diameter tool 16 also has a hole for inserting the thermocouple 14, and the thermocouple terminal block (not shown) is on the opposite surface of the machining tip mounting portion 16 a (the back side of the paper surface in FIG. 1 (b)). Is provided and is connected to the compensation lead wire described later.

<< Overall configuration of the temperature measuring device of the lathe device of the present invention >>
FIG. 2 shows a device configuration for externally transmitting temperature data from the machining tip 10 from the outer diameter tool 16 to which the machining tip 10 described above is mounted.
A thermocouple terminal block for connecting the thermocouple terminal and the compensating lead wire is provided on the opposite surface of the processing chip mounting portion 16 a described above, and a terminal block cover 18 for protecting the connection with the compensating lead wire is provided. It is attached to the outer diameter bite 16. In FIG. 2, the thermocouple terminal block side appears on the front side, and the processing chip 10 and the processing chip mounting portion 16a side are located on the back side of the paper surface.
The compensating lead wire connected to the thermocouple terminal in the terminal block cover 18 is guided to the outside from the outer diameter bit 16 and is connected to the accommodating box 19 containing the electronic circuit for wireless transmission. The compensating lead wire is covered with a metal flexible tube 20 to have flexibility and is protected from turning debris and coolant. One end of the flexible tube 20 is fastened to the terminal block cover 18 with bolts 21, and the compensating lead wire is electrically connected to the thermocouple terminal block inside the terminal cover 18. Further, the other end of the flexible tube 20 is fastened to the accommodating box 19 with a separable bolt 21, and the compensating lead wire is electrically connected to the internal component.

The turret 29 (see FIG. 6) has a holder 30 for fixing the outer diameter tool 16 (see FIG. 6), and the storage box 19 is fixed on this holder. Since the holder 30 rotates in cooperation with the turret 29 and the outer diameter tool 16, the relative positional relationship with the outer diameter tool 16 and the storage box 19 does not change and is not affected by the rotation of the turret 29.

<< About electric signal flow >>
Next, using the block diagram of FIG. 3, the flow of the electric signal from the thermocouple 14 to the transmission of the temperature measured by the machining chip 10 to the external unit 28 via the accommodation box 19 will be described as an example. Each arrow in FIG. 3 is a flow of an electric signal indicating the temperature of the processing chip 10 measured by the thermocouple 14, and the wired system is indicated by a solid line and the wireless system is indicated by a broken line depending on the type of signal transmission line. ing. The temperature data measured by the thermocouple 14 is received by the temperature receiving unit 24. The temperature receiving unit 24 is provided in the accommodating pox 19 to which the compensating lead wire for transmitting the temperature data from the thermocouple 14 is connected. The temperature receiving unit 24 includes, for example, a zero contact compensation circuit 24a, a potential difference amplifier 24b, and an A / D (analog / digital) converter 24c. In addition, a transmission unit 26 is provided in the storage box 19, and a controller 26a that transmits and receives data from the temperature reception unit 24 controls 26b with a wireless communication device, and the wireless communication device controls data from 26b to the outside of the storage box 19. Send.

In addition, the external unit 28 is composed of a wireless reception / recording output device, and the wireless reception / recording output device 28 is a wireless reception device 28a and a serial USB (Universal) from the upstream side to the downstream side along the flow of an electric signal. Serial Bus) It is equipped with a converter 28b, a recording / computing device 28c such as a personal computer, and an output device 28d such as a display or a printer. The wireless communication standards between the wireless communication device 26b and the wireless reception device 28a shown by the broken line in Fig. 3 are Wi-Fi (Wireless Fidelity), Bluetooth (Bluetooth>, wireless LAN (Local Area Network), and ZigBee ( It is possible to use Zigbee) or the like. By using such a wireless communication device, the temperature information measured in the vicinity of the tip of the processing chip 10 is transmitted to the external unit 28.

<< About the tip position of the thermocouple >>
The cutting edge (tip) of the actual machining tip 10 comes into contact with the member to be machined and is the most prone to wear, chipping, etc., and this temperature measuring device is desired to measure and evaluate the temperature of this cutting edge. On the other hand, it is also necessary to prevent the thermocouple 14 from being exposed due to wear of the processing tip 10. Therefore, it is preferable to estimate the temperature of the tip of the cutting edge from a plurality of measurement results in which the depth of the temperature measuring hole 12 of the machining tip 10 is changed.

FIG. 4 shows a schematic cross-sectional view of an example of the depth position of the thermocouple 14 to be inserted into the machining tip 10. Further, in the order of FIGS. 4 (a) to 4 (c), an example is shown in which the distance t from the contact position between the workpiece 17 and the machining tip 10 to the tip position of the thermocouple 14 approaches (specifically). Is the distance t = t1, t = t2, t = t3) in the order of FIGS. 4 (a) to 4 (c). Further, in FIG. 5, the measurement result at the machining time and the estimated temperature at the contact position with the cutting edge, that is, the machining member 17 are graphed. As for the result of FIG. 5, all the temperature measurements of FIGS. 4 (a) to 4 (c) are performed under the same processing conditions. It can be understood that the temperature of the cutting edge can be estimated from the measurement results of t = t1 to t3 as shown in the result of Fig. 5.

The thermocouple 14 is inserted into the temperature measurement hole 12 and fixed by filling the gap between the two 14 and 12 with a high thermal conductive adhesive (for example, Dotite (manufactured by Fujikura Kasei Co., Ltd.)). .. The depth of the temperature measuring hole 12 of the machining tip 10 (t1, t2, t3 in FIGS. 4A to 4C) has a slight error due to the drilling operation. In particular, since the machining tip 10 used for a lathe has a shorter depth distance than a machining tool, the hole depth tolerance is small and accuracy is required. Therefore, by filling the gap between the thermocouple 14 and the temperature measuring hole 12 that occurs when the thermocouple 14 is inserted into the temperature measuring hole 12, the variation at the time of temperature measurement can be reduced. ..

With reference to FIG. 6, it is shown that a plurality of outer diameter bites 16 are attached to the turret 29 (the arrows in the figure indicate the rotation direction of the turret 29). As described above, a plurality of (three in FIG. 6) outer diameter tools 16 are fixed to the corresponding holders 30 in the turret 29. A storage box 19 containing a transmitter 26 such as the wireless communication device 26 b shown in FIG. 3 is fixed to the holder 30. The storage box 19 is fixed on each holder 30. The holder 30 rotates in cooperation with the turret 29 and the outer diameter tool 16.

Therefore, even if the turret 29 is rotated during the so-called tool change during continuous machining, the holder 30 whose relative positional relationship with each outer diameter tool 16 does not change is a wireless communication device corresponding to each outer diameter tool 16. Since the 26b is built-in, there is no problem that the wiring from the thermocouple 14 is entangled. Therefore, it is possible to measure the temperature of the machining tips 10 of a plurality of outer diameter tools without continuously machining without stopping the lathe device every time the tool is changed.

10 Processing chips
10 Thermocouple side
12 Temperature measurement hole
13 Through hole
14 Thermocouple
16 outer diameter tool
16 a Machining tip mounting part
17 Work member
18 Terminal block cover
19 Storage box
20 Flexible tube
21 bolts
24 Temperature receiver
24a Zero contact compensation circuit
24b potential difference amplifier
24c A / D converter
26 Transmitter
26a controller
26b Wireless communication device
28 External unit
28a wireless receiving device
28b serial / USB converter
28c Recording / arithmetic unit for personal computers, etc.
28d Output devices such as displays and printers
29 turret
30 holder

Claims (6)

A replaceable cutting edge tip temperature measuring device provided at the tip of a cutting tool that slides in the radial direction of a turret that rotates in a lathe device that can slide in the axial direction. A semi-penetrating temperature measurement hole is provided in the thickness direction of the opening of the surface, and the outer diameter tool has a thermocouple in advance at a position facing the temperature measurement hole when the cutting edge tip is mounted on the outer diameter tool. Is arranged, and when the cutting edge tip is mounted, the tip of the thermocouple is inserted and positioned in the temperature measurement hole of the cutting edge tip to receive the temperature information from the thermocouple, and the temperature information is transmitted to the outside wirelessly. A temperature measuring device including a means for transmitting temperature information to be transmitted. The tip of the thermocouple projects from the mounting side of the cutting edge tip of the outer diameter bite, and the connection terminal at the other end of the thermocouple is a terminal block provided on the side opposite to the side on which the cutting edge tip is mounted. The temperature measuring device according to claim 1, wherein the temperature information transmitting means is electrically connected to the terminal block via a compensating lead wire. Prepare multiple identical cutting edge tips with different depth measurement holes, measure the temperature change over time from each thermocouple under the same machining conditions, and measure the contact position between the cutting edge tip and the workpiece from the measurement results. The temperature measuring device according to claim 1 or 2, wherein the temperature is estimated. The temperature measuring device according to any one of claims 1 to 3, wherein a high thermal conductive adhesive is filled in a gap between the thermocouple and the temperature measuring hole of the cutting edge tip. The temperature measuring device according to any one of claims 1 to 4 is provided for each of the plurality of outer diameter tools mounted on the turret, and a tool including the plurality of outer diameter tools is used. A temperature measuring device, characterized in that the temperature measurement result of each outer diameter tool is acquired during continuous machining including the rotation of the turret. Any of claims 1 to 4, which controls to stop the operation of the lathe device or relax the processing conditions of the lathe device when it is detected that the temperature information from the thermocouple exceeds a preset threshold value or the amount of change. The temperature measuring device according to item 1.

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