JP2021113738A - Temperature-sensing sensor pin and temperature-sensing sensor having the same - Google Patents

Abstract

To provide a temperature-sensing sensor pin capable of continuously measuring a temperature change in a coagulation process of a body for which temperature is sensed with an improved response, and to provide a temperature-sensing sensor having the temperature-sensing sensor pin.SOLUTION: In a temperature-sensing sensor pin fixed in a through hole bored on a wall part of a cavity into which a melted body for which temperature is sensed is allowed to flow or is filled, the temperature-sensing sensor pin includes a cylindrical body having an annular flange that has the annular flange extended from one cylindrical tip end to the inside in a radial direction, a columnar light transmission body that is pressed against a flange surface in an outer side of the wall part of the annular flange in a face contact state and forms a hole part and a recess of the annular flange, and has an outer shape width less than the inner diameter of a cylindrical part of the cylindrical body having the annular flange and can transmit light, and a press body for pressing a surface in the outer side of the light transmission body in the annular flange direction.SELECTED DRAWING: Figure 2

Description

The present invention continuously responds to a temperature change in the solidification process from a high temperature to solidification with respect to a temperature-measured object to be filled in a cavity such as a die casting mold, a casting mold, or a plastic mold. The present invention relates to a temperature measuring sensor pin that enables measurement and a temperature measuring sensor provided with the pin.

For example, in casting such as the die casting method in which non-ferrous metals such as aluminum, zinc or magnesium and their alloys are mass-produced with high dimensional accuracy in a short time, the temperature change in the solidification process of the molten metal is responsive and continuous. It is important to understand the quality of casting products.

A thermocouple is generally used as a temperature measuring means in the solidification process of molten metal. In the case of a thermocouple, the temperature is converted from the inherent thermoelectromotive force of the metal conductor generated by immersing the temperature measuring contact directly in the molten metal.

Further, as a thermometer having a fast response speed, there is a radiation thermometer using an optical fiber. The tip of the optical fiber of the optical fiber radiation thermometer is immersed in molten metal, and the synchrotron radiation captured from the tip of the optical fiber is converted into temperature and displayed as a temperature. The response speed is faster than that of a thermocouple because it takes in synchrotron radiation.

Further, in Patent Document 1, a hollow bolt that can be fitted into a hole in the pressure vessel wall so that the bolt end is flush with the inner wall surface of the pressure vessel wall, and one surface is adjacent to the bolt end. As described above, the infrared ray passing window fixed to the bolt end of the hollow bolt, the optical fiber bundle fixed in the other end of the hollow bolt, and the window and the optical fiber bundle cooperate with each other to emit infrared radiation to the window. An infrared temperature probe comprising a glass rod arranged in the hollow bolt so as to pass through the optical fiber bundle is disclosed.

Patent Document 2 describes a cylindrical hollow shaft portion, a tubular spacer inscribed and fixed to the hollow shaft portion, and a columnar shape fixed to the inner wall surface of the tubular spacer by a first heat-resistant adhesive layer. A pin with a light guide body is disclosed, which has a light guide body of the above, and is provided with a non-adhesive portion having a predetermined length from the tip of the light guide body on the inner wall surface of the tubular spacer and the surface of the light guide body facing the inner wall surface. ing.

In Patent Document 3, a plurality of through holes are spirally provided on the side wall of the mold of a continuous casting machine, and each through hole is provided with a temperature detection element having excellent heat resistance and light collection property, and the end faces thereof are the inner circumference of the mold. A monitoring and measuring device for the temperature inside a mold, which is inserted so as to be recessed from the surface and the outputs of these temperature detecting elements are guided to a heat ray thermometer by an optical fiber, is disclosed.

Japanese Unexamined Patent Publication No. 58-137721 Japanese Patent No. 4874444 Japanese Patent No. 3121672

When the thermocouple is used, it takes time for the temperature measuring contact to rise in temperature, so the temperature of the solidification process of the molten metal in the die casting mold filled in several tens of ms is not delayed. There was a problem that it could not be measured. In the die casting method, the molten metal solidifies inside the mold. Therefore, when the thermocouple temperature measuring contact is immersed in the molten metal in the mold, the temperature measuring contact is embedded when the molten metal solidifies and casting. There was a problem that the temperature measuring contact was damaged when the product was taken out, and continuous use was not possible.

When the optical fiber is used, the emissivity of the object to be measured must be accurately grasped and adjusted in order to measure the temperature in a non-contact manner using synchrotron radiation of a single color wavelength. There was a problem that it could not be grasped. Further, although accurate temperature measurement can be performed by immersing the temperature measuring contact of the optical fiber in the molten metal, there is a problem that the temperature measuring contact of the immersed optical fiber is damaged by solidification. There was a problem that it could not be used continuously because it was damaged.

In the invention of Patent Document 1, the window is formed into a truncated conical shape so that the tapered surface is a support surface larger than the outer surface of the window to which the initial pressure is applied, and the tapered surface of the hollow bolt supports the tapered surface of the window over its substantially entire length. It is a structure in which the female screw of the locking ring is screwed into the male screw of the hollow bolt while the one end side of the locking ring is in contact with the outer surface of the window, and the tapered surface of the window is pressed against the tapered surface of the hollow bolt. Then, the other end surface of the screwed locking ring is brought into contact with the stepped hollow bolt, and a tap is set up over both parts so that the contacted position becomes the axis, and the fixing bolt is screwed in. It is a structure to be used. Therefore, when the other end surface of the locking ring comes into contact with the stepped surface of the hollow bolt at a timing before pressing the tapered surface of the window against the tapered surface of the hollow bolt, between the tapered surface of the hollow bolt and the tapered surface of the window. To prevent this, the taper surface dimensional accuracy of the window, the tapered surface of the hollow bolt and the stepped position dimensional accuracy, and the position dimensional accuracy of the other end surface of the locking ring and the window contact surface of the annular flange Processing must be performed with extremely minimal error, and there are problems such as difficulty in processing itself and an increase in processing cost.

Although the invention of Patent Document 1 uses an infrared thermometer, there is no description that the temperature is measured by two wavelengths. Therefore, the exact temperature must be accurately grasped and adjusted to the emissivity of the object to be measured. There was a problem that I could not grasp. Further, as shown in FIG. 5 of Patent Document 1, the hole of the annular flange is smaller than the outer diameter of the optical fiber bundle. Generally, the focusing angle of an optical fiber is manufactured so that the measurement diameter becomes larger as the measurement distance becomes longer. Therefore, the side surface of the hollow bolt in contact with the window and the annular flange are included in the measurement diameter range. The optical fiber bundle, which is the condensing part, captures the infrared rays from the side surface of the hollow bolt in contact with the window, the infrared rays from the annular flange, and the infrared rays from the object to be measured, and the temperature is measured. There was a problem that accurate temperature measurement was not possible.

In addition, when replacing a window with a truncated cone shape, the locking ring holding the window must be turned to remove it, but this cannot be done when it is fitted to the wall of the pressure vessel, so infrared rays are emitted from the pressure vessel. The temperature measuring instrument must be removed, then the locking ring must be turned off, the window replaced, the locking ring screwed in again, and then the infrared temperature measuring instrument must be fitted to the wall of the pressure vessel. There was a problem that it was bothersome.

The invention of Patent Document 2 is an invention relating to temperature measurement during molding of a resin. In paragraph [0032] of Patent Document 2, "The tip surface of the ejector pin in contact with the resin during molding is a hollow shaft portion, a tubular spacer, and an optical fiber. When the invention of Patent Document 2 is used in the die casting method, the molten metal solidifies inside the mold, so that the tip surface of the optical fiber is embedded when the molten metal solidifies. There is a problem that the tip surface of the optical fiber is damaged when the cast product is taken out. There was a problem that it could not be used continuously because it was damaged.

According to the invention of Patent Document 3, in the rod-shaped temperature detector made of transparent quartz fitted in the through hole, the surface on the side in contact with the molten metal is a vertical surface, and the vertical surface is in contact with the molten metal on the entire surface including the peripheral edge. Since it has a structure, there is a problem that the temperature detector made of transparent quartz is damaged such as cracks from the peripheral edge of the vertical surface due to the influence of shrinkage in the process of solidifying the molten metal. There was a problem that it could not be used continuously because it was damaged.

The present invention was devised in view of these problems, and can be used continuously without causing damage to the temperature measuring contacts, without causing a field loss, and can continuously measure the temperature change of the temperature-measured object with good response. It is an object of the present invention to provide a temperature measurement sensor pin capable of easily exchanging a light transmitter that transmits radiation and a temperature measurement sensor including the pin.

In the present invention, the inward direction or the outward direction means the inside / outside direction seen from the central portion in the thickness direction of the wall portion forming the cavity, and for example, the inward direction forms a cavity such as a mold cavity or a runner. It means the inner wall surface side direction when viewed from the central portion in the thickness direction of the wall portion, and the outer direction means the outer wall surface side direction when viewed from the central portion in the thickness direction of the wall portion.

The temperature measuring sensor pin according to claim 1 is a temperature measuring sensor pin that fits a melted material to be measured into a through hole formed in a wall portion of a cavity capable of flowing or filling, and is the temperature measuring sensor pin. Is pressed against a cylindrical body with an annular flange having an annular flange extending radially inward from one end edge of the tubular shape and a flange surface on the outward side of the wall portion of the annular flange in a surface contact state. A column-shaped light transmitter having an outer diameter smaller than the inner diameter of the cylindrical portion of the cylindrical portion of the cylindrical body with an annular flange and capable of transmitting light, and the light transmitting body having a hole and a recess of the annular flange. It is characterized by including a pressing body that presses the outer side surface of the body toward the annular flange direction.

The temperature measuring sensor pin according to claim 2 is characterized in that, in claim 1, both end faces on the inner side and the outer direction side of the wall portion of the light transmitter have parallel planes.

The temperature measuring sensor pin according to claim 3 is screwed on the inner peripheral surface of the male screw screwed on the outer peripheral surface of the presser body on the inner direction side and the inner peripheral surface of the cylindrical body with an annular flange in claim 1 or 2. It is characterized in that the light transmitting body is pressed against the outer flange surface of the annular flange by screwing the holding body into the female screw.

The temperature measuring sensor pin according to claim 4 forms a cavity in any one of claims 1 to 3, with the tip end side facing inward and the other end side facing outward. It can be fitted into the wall of the mold, the wall of the pipe forming the runner, or the through hole formed in the wall of the sleeve forming the hot water pool having an extrusion means, and the tip can be fitted. The cylindrical body with an annular flange facing inward, the column-shaped light transmitting body, and a long light guide body that can be inserted into the axial center portion and have substantially the same size as the outer diameter of the light guide body. A substantially columnar holding body having a through hole with an inner diameter of the annular flange and having an outer diameter substantially the same as the inner diameter of the cylindrical body with an annular flange, and the tip surface of the annular flange on the inward side is the wall portion. It is characterized in that it can be fitted so as to be flush with the inner wall surface of the light-transmitting body, and the tip end portion of the light guide body can be brought into contact with the outer surface of the light-transmitting body.

In any one of claims 1 to 4, the temperature measuring sensor pin according to claim 5 has an inner diameter of the annular flange set in advance of a long light guide body inserted into an axial center portion of the holding body. It is characterized in that the size is such that only the light transmitting body and the temperature-measured body are present in the optical path based on the light condensing angle.

The temperature measurement sensor pin according to claim 6 is characterized in that, in any one of claims 1 to 5, the inner diameter of the annular flange is obtained by the formula (1).
d ≧ 2 (L + T) tan (θ / 2) + D ... (1)
Inner diameter of annular flange: d
Annular flange thickness: L
Thickness of light transmitter: T
Focusing angle of light guide: θ
Outer diameter of light guide: D

The temperature measuring sensor pin according to claim 7, in any one of claims 1 to 6, is a protrusion of a tool for screwing in and out of the cylindrical body with an annular flange on the tip surface on the inward side of the cylindrical body with an annular flange. It is characterized in that at least two holes for fitting are provided.

The temperature measuring sensor according to claim 8 is characterized by including the temperature measuring sensor pin according to any one of claims 1 to 7.

Since the temperature measurement sensor pin according to claims 1 to 4 is in non-contact with a temperature-measured body that solidifies by cooling after being melted at a high temperature such as a molten metal, the temperature measurement contact at the tip of the temperature measurement sensor pin Since the cylindrical body with an annular flange and the light transmitting body are firmly adhered to each other in a surface contact state without causing damage, the temperature-measured body to be measured at a high temperature such as a molten metal is in contact with the peripheral edge of the light transmitting body. Therefore, the light transmitting body does not crack due to shrinkage in the solidification process of the temperature-measured body. As a result, the temperature measurement sensor pin can continuously measure the temperature change with good response, and can be used continuously.

The surface of the light transmitter that comes into contact with the melted hot water such as the molten metal is slightly recessed from the tip surface of the resistance temperature sensor pin to the outward side by the thickness of the annular flange. Since the flow of the melted object to be measured, such as the molten metal, that has flowed into the recess has calmed down, the certainty of temperature measurement can be improved.

Further, since the light transmitting body is fixed only by pressing by screwing without fixing with an adhesive, the light transmitting body can be easily replaced without any trouble.

In the temperature measuring sensor according to claim 2, since both end faces of the inner and outer sides of the wall portion of the light transmitting body are made parallel planes, a hot metal to be measured such as a molten metal is melted. Does not apply a contractile pressure to the surface of the light transmitting body when the light transmitting body shrinks due to cooling, so that the surface of the light transmitting body does not crack due to shrinkage. As a result, the temperature measurement sensor pin can be continuously measured for temperature change with good response, and can be continuously used.

The temperature measurement sensor pin according to claim 5 or 6 does not collect infrared rays other than the temperature-measured object in the optical path based on the focusing angle determined by the optical fiber, and there is no shield in the optical path. There is no lack of visual field, and the effect is that accurate temperature measurement of the temperature to be measured can be performed in real time.

The temperature measuring sensor pin according to claim 7 may be such that the cylindrical body with an annular flange is removed to, for example, the cavity side of the mold in a state where the temperature measuring sensor pin is fitted in a through hole formed in the wall surface of the mold. Therefore, the light transmitter can be replaced very easily.

The temperature measuring sensor according to claim 8 has the same effect as that of the invention according to any one of claims 1 to 7.

It is a plan view cross-sectional explanatory view at the axis of the temperature measuring sensor in the state which incorporated the temperature measuring sensor of this invention into a die-casting die. It is a plan view cross-sectional explanatory view at the axis of the temperature measuring sensor of this invention. It is a side view cross-sectional explanatory view at the axis of a cap screw type temperature measuring sensor pin in a state where a light guide body is not inserted. An explanatory view of a cap screw type temperature measuring sensor pin with a light guide inserted, (a) is a side view cross-sectional explanatory view at the axial center, and (b) is a plan view cross-sectional explanatory view at the axial center. .. It is an enlarged view of the part B of FIG. 4 (b). It is an explanatory view of the temperature measuring sensor pin seen by arrow A, (a) is an explanatory view of a form in which a screwdriver hole is provided on the inner surface of the annular flange of a cylindrical body with an annular flange, and (b) is an annular shape. It is explanatory drawing of the form in which the hole for a screwdriver tool is not provided on the inner side surface of the annular flange of a cylindrical body with a flange. It is a side view cross-sectional explanatory view at the axis of the internal screw type temperature measuring sensor pin in a state where a light guide body is not inserted. It is an explanatory view of an internal screw type temperature measuring sensor pin with a light guide inserted, (a) is a plan view cross-sectional explanatory view at the axial center, and (b) is a side view cross-sectional explanatory view at the axial center. .. It is an enlarged view of the part C of FIG. 8 (b). It is sectional drawing at the axis of the tip of the temperature measuring sensor pin. FIG. 5 is an explanatory view for explaining the dimensional configuration of the tip portion by eliminating diagonal lines in a cross section of the tip portion of the temperature measurement sensor pin of FIG. 10 at the axial center. It is explanatory drawing of the dimensional relation of the tip part of the temperature measurement sensor pin of FIG. It is a figure which shows the temperature measurement result inside the die cast mold by a thermocouple, (a) is the explanatory view of the first temperature measurement result, (b) is the explanatory view of the second temperature measurement result, (c) is. It is explanatory drawing of the 3rd temperature measurement result. It is a figure which shows the temperature measurement result inside the die-cast mold by the immersion type optical fiber thermometer, (a) is the explanatory view of the first temperature measurement result, (b) is the explanatory view of the second temperature measurement result, ( c) is an explanatory diagram of the result of the third temperature measurement. It is a figure which shows the temperature measurement result inside the die cast mold by the temperature measurement sensor of this invention, (a) is the explanatory view of the first temperature measurement result, (b) is the explanatory view of the second temperature measurement result. (C) is an explanatory diagram of the result of the third temperature measurement. It is a figure which shows the temperature measurement result inside the die cast mold by the temperature measurement sensor of this invention, (a) is the explanatory view of the 98th temperature measurement result, (b) is the explanatory view of the 99th temperature measurement result. (C) is an explanatory diagram of the result of the 100th temperature measurement. An explanatory view of the shape and fixing method of the light transmitting body, (a) is a comparative example of the light transmitting body, an explanatory view in which a light transmitting body having a flat end face is fixed with an adhesive, and (b) is a light transmitting body. In the comparative example of the above, the light transmitting body for reducing the focusing angle is formed into a convex shape and fixed by an annular flange and a pressing means. FIG. It is explanatory drawing which fixed the light transmission body of the above with an annular flange and a pressing means. It is explanatory drawing of the form in which the temperature measuring sensor of this invention is fitted in the through hole formed in the wall part of the cavity of a mold, and in the wall part of a tubular part which forms a hot water pool having an extrusion means.

As shown in FIG. 1 or FIG. 18, the temperature measurement sensor pin 1 of the present invention and the temperature measurement sensor 2 provided with the pin 1 are infrared radiation thermometers capable of measuring the temperature of the temperature-measured object 70 from high temperature to low temperature in a non-contact manner. Yes, for example, in the solidification process from high temperature to solidification of the temperature-measured object 70 that flows or fills in the cavity 33 such as a die cast mold, a casting mold, a plastic mold, or a cavity 33 such as a hot water pool. Temperature changes can be measured continuously with good response.

Example 1 of the present invention is shown in FIGS. 2, 7 to 9, FIG. 2 is shown in FIGS. 3 to 6, and components common to Examples 1 and 2 are shown in FIGS. 1 and 6 (b). ), FIGS. 10 to 12 and 18.

As shown in FIG. 2, the temperature measuring sensor 2 of the present invention has a temperature measuring sensor pin 1 that collects infrared light, converts the collected infrared light into an electric signal, and converts the converted electric signal into a unit of temperature. It is provided with a measurement main unit 3 displayed by. Then, for example, when the die casting mold 30 including the fixed mold 31 and the movable mold 32 is installed, the temperature measuring sensor pin 1 is fitted in the wall portion of the fixed mold 31 as shown in FIG. 1 or FIG. In the process of the molten metal, which is the resistance temperature detector 70 stored in the hot water pool 33b, is pushed out at a high pressure by, for example, the piston 71, flows through the runner 33c, flows into the cavity 33 of the cavity 33a, fills and solidifies. Output the temperature.

Further, the temperature measurement sensor pin 1 can be fitted in the movable mold 32, but in the case of the die casting mold 30, impact and vibration are generated by opening and closing the movable mold 32, moving the injection cylinder, and the like. In order to suppress the influence on the measurement caused by the transmission of these shocks and vibrations to the temperature measuring sensor pin 1, it is preferable to install the temperature measuring sensor pin 1 on the fixed mold 31.

Further, when the temperature measuring sensor pin 1 is installed in the die casting mold 30, for example, as shown in FIG. 18, the wall portion of the fixed mold 31, the wall portion of the pipe forming the runner 33c, and / or extrusion. There is also a form of fitting into a through hole formed in the wall portion of the tubular portion (sleeve 72) forming the hot water pool 33b having the means.

As shown in FIGS. A temperature measuring sensor pin 1 fitted in a hole, wherein the temperature measuring sensor pin 1 is a cylindrical body 4 with an annular flange having an annular flange 4a extending radially inward from one end edge of a tubular shape, and the annular body. A tubular portion of the annular flange 4a cylindrical body 4 having a hole and a recess 10 pressed against the outer side flange surface of the flange 4a in a surface contact state. A pillar-shaped light transmitting body 5 having an outer width smaller than the inner diameter and capable of transmitting light, a pressing body 6 for pressing the outer side surface of the light transmitting body 5 toward the annular flange 4a, and an optical fiber. The light guide body 7 is provided.

The temperature to be measured 70 corresponds to, for example, an aluminum alloy or a zinc alloy in the case of a die casting mold, and corresponds to, for example, a thermoplastic resin such as polyethylene or a thermosetting resin such as phenol in the case of a plastic mold. However, in the case of casting dies, for example, aluminum alloy is applicable.

As shown in FIG. 1 or 18, the cavity 33 corresponds to the cavity 33a, the pool 33b, the runner 33c, and the like, and refers to a portion where the molten metal of the resistance temperature detector 70 flows or is filled.

As the wall portion, when the cavity 33 is the cavity 33a, the fixed mold 31 or the movable mold 32 of the mold is used, and when the cavity 33 is the runner 33c, the peripheral wall (fixed mold 31 or the movable mold 32) forming a pipe is formed. In some cases), or when the cavity 33 is a hot water pool 33b, the peripheral wall of the sleeve 72, which is a tubular portion forming the hot water pool 33b having a mold extrusion means, corresponds to this.

Therefore, as shown in FIGS. 1 and 18, the temperature measuring sensor pin 1 is formed in the peripheral wall (fixed mold 31) forming the pipe of the runner 33c, for example, in the through hole formed in the fixed mold 31 of the mold. It is fitted in the through hole provided or in the through hole formed in the peripheral wall of the sleeve 72.

As shown in FIGS. 5, 6, 9 or 10, the cylindrical body 4 with an annular flange has a substantially cylindrical shape having an annular flange 4a extending radially inward from one end edge of the cylinder. I am doing. When the temperature measuring sensor pin 1 is installed on the wall of the cavity 33a, the pool 33b, or the cavity 33 of the runner 33c, the tip surface 4b on the inward side, which is the cavity 33 side of the annular flange 4a, is shown in FIG. 1 or As shown in FIG. 18, for example, the fixing mold 31 is fitted so as to be flush with the inner wall surface 35, that is, with the inner wall surface forming the cavity 33a, the basin 33b, or the runner 33c, which is the cavity 33.

As shown in FIGS. 6A and 6B, the form of the flange portion of the annular flange 4a of the cylindrical body 4 with an annular flange is such that a through hole is formed in a circular central portion in view of arrow A from the cavity 33 side. It is provided so that the light transmitting body 5 can be seen through the through hole. A recess 10 is formed by the through hole and the light transmitting body 5. Further, as shown in FIG. 6A, at least a hole 11 for fitting a protrusion of the screwing / exiting tool of the annular flanged cylinder 4 is provided on the inwardly-oriented tip surface of the annular flanged cylinder 4. Two or more places are provided, and in this case, the protrusion of the special tool is fitted into the hole 11 and the cylindrical body 4 with the annular flange is rotated so that the cylinder can be easily screwed in and out. Therefore, the cylindrical body 4 with an annular flange can be screwed in and out with the temperature measuring sensor pin 1 fitted in the wall portion, and the light transmitting body 5 can be easily replaced.

Further, a female screw 4d is engraved on the inner peripheral surface of the cylindrical body 4 with an annular flange. The female screw 4d is screwed with the male screw 6a of the presser body 6.

As shown in FIGS. 5, 9 or 10, the light transmitting body 5 is pressed against the flange surface on the outer side of the wall portion of the annular flange 4a in a surface contact state to form a hole in the annular flange 4a. It has a columnar shape that forms a portion and a recess 10 and has an outer width smaller than the inner diameter of the cylindrical portion of the cylindrical portions 4A and 4B with an annular flange and is capable of transmitting light. As the form of the pillar shape, the cross-sectional shape in the direction connecting the inner direction and the outer direction is a quadrangular cylinder or a prism, or the cross-sectional shape in the direction connecting the inner direction and the outer direction is trapezoidal. There are truncated cones or quadrangular pyramids.

Further, both end faces of the wall portion of the light transmitter 5 on the inner direction side and the end faces on the outer direction side have parallel planes.

The material of the light transmitter 5 may be quartz glass for temperature measurement using a mold several tens of times, but sapphire glass having better heat resistance than quartz glass when the mold is used several hundred times a day. And nitrided silicon transparent ceramics and the like are preferable.

The recess 10 is a portion that is slightly recessed from the tip surface 4b on the inner direction side of the annular flange 4a that is flush with the inner wall surface 35 of the wall portion forming the cavity 33, and is a portion that is slightly recessed. It is formed by the peripheral wall of the hole and the surface of the light transmitting body 5. By slightly storing the molten metal of the resistance thermometer 70 in the recess 10 and not letting it escape, it is possible to stabilize the temperature measurement accuracy of the molten metal passing through while turbulently flowing at high speed.

The pressing body 6 presses the surface of the light transmitting body 5 on the outer side toward the annular flange 4a. The inner diameter of the cylindrical body 4 with an annular flange is provided with a through hole 12 into which a long light guide body 7 can be inserted and has an inner diameter substantially the same as the outer diameter of the light guide body 7. It has a substantially cylindrical shape having substantially the same outer diameter as the above, and a male screw 6a is engraved on the outer peripheral surface on the inner side. The male screw 6a is screwed with a female screw 4d screwed on the inner peripheral surface of the cylindrical body 4 with an annular flange. Then, the tip end portion of the inserted light guide body 7 can be brought into contact with the surface of the light transmitting body 5 on the outward direction side.

Then, the male screw 6a screwed on the outer peripheral surface of the presser body 6 and the female screw 4d screwed on the inner peripheral surface of the cylindrical body 4 with the annular flange are screwed together to screw the presser body 6. Thereby, the light transmitting body 5 is pressed against the flange surface on the outward side of the annular flange 4a. Thereby, the light transmitting body 5 can be sandwiched and fixed between the annular flange 4a and the holding body 6, and the cylindrical body 4 with an annular flange, which is a main component of the temperature measuring sensor pin 1, said. The light transmitting body 5 and the holding body 6 can be integrated.

Here, the shape of the light transmitting body 5 and the immobilization method will be compared. When a cylindrical light transmitting body 5A is fitted into a concave portion of a cylindrical body 51 with an adhesive 50 as shown in FIG. 17 (a) as Comparative Example 1, a convex lens as shown in FIG. 17 (b) as Comparative Example 2. When the light transmitting body 5B of No. 5 is pressed against the cylindrical body 52 with an annular flange by the pressing body 61, the cylindrical light transmitting body 5C is pressed against the cylindrical body 53 with an annular flange as shown in FIG. 17C as the present invention. Table 1 summarizes the comparison using the case of pressing at 62.

From Table 1, only the present invention can be used continuously for 100 shots or more. Therefore, in order to enable continuous use of 100 shots or more, the light transparent body 5 needs to have both the inner end face and the outer end face flat and both end faces parallel to each other. It is necessary to press the cylindrical light transmitting body 5C against the cylindrical body 53 with an annular flange in a surface contact state.

Further, since the light transmitting body 5 can be fixed to the annular flange 4a by the tightening force of the screw by screwing the pressing body 6, it is not necessary to use a heat-resistant adhesive, and the light transmitting body is eliminated. It was possible to prevent the molten metal from being inserted between the body 5 and the cylindrical body 4 with an annular flange. Then, as shown in FIG. 5 or 9, the peripheral edge portion 5a of the light transmitting body 5 can be covered with the annular flange 4a, so that delamination of the temperature-measured body 70 by the molten metal can be prevented.

Further, the light guide body 7 is inserted into the through hole 12 as shown in FIGS. 3 and 7, and the tip end portion of the light guide body 7 is inserted into the through hole 12 as shown in FIGS. It is brought into contact with the surface on the outward side. When the light guide body 7 is an optical fiber, the light collection angle is determined in advance, so that the inner diameter of the annular flange 4a is inserted into the axial center portion of the holding body 5 to be a long light guide body 7. The size is such that only the light transmitting body 5 and the temperature-measured body 70 exist in the optical path based on the preset focusing angle of the above.

Further, the temperature measurement sensor pin 1 has a pipe wall portion forming a runner 33c on a mold wall portion forming the cavity 33a with the tip end side facing inward and the other end side facing outward. Or, the cylindrical body 4 with an annular flange, which can be fitted into a through hole formed in the wall of a sleeve 72 forming a hot water pool 33b having an extrusion means, and whose tip portion 4b is directed inward. The light transmitting body 5 having a column shape and a through hole having an inner diameter that is substantially the same as the outer diameter of the light guide body 7 and capable of inserting a long light guide body 7 into the axial center portion. A substantially columnar holding body 6 having an outer diameter substantially the same as the inner diameter of the cylindrical body 4 with an annular flange is provided, and the tip surface 4b on the inward side of the annular flange 4a faces the inner wall surface of the wall portion. It can be fitted so as to be one, and the tip end portion of the light guide body 7 can be brought into contact with the surface of the light transmitting body 5 on the outward side.

The temperature measuring sensor pin 1 can measure the temperature of various objects to be measured 70 in a non-contact manner, but the cavity 33 is particularly hot when flowing in the molten metal cavity 33 or when cooling starts and enters the solidification process. It is possible to continuously measure the temperature change of the temperature-measured body 70 in the state of being filled in 33 with good response.

As shown in FIG. 1, the temperature measuring sensor pin 1 has its tip end facing inward, which is, for example, the cavity 33 side of the fixed mold 31 of the die casting mold 30, and the other end facing outward. It is fitted into the through hole formed in the wall. The fitting form is, for example, a form in which a male screw screwed into the outer peripheral surface of the temperature measuring sensor pin 1 is screwed into a female screw screwed into the through hole portion (not shown), or the figure. 1 or as shown in FIG. 18, there is a form in which the stepped portion formed in the through hole portion and the stepped portion 13a, 13b, 13c formed on the outer peripheral surface of the temperature measuring sensor pin 1 are fitted until they come into contact with each other. However, any form may be used as long as the temperature measuring sensor pin 1 can be fitted in the wall portion.

The temperature measurement sensor 2 includes the temperature measurement sensor pin 1 and the measurement main body 3. Then, as shown in FIG. 1 or 2, the temperature measurement sensor pin 1 and the measurement main body 3 that converts the focused infrared light into an electric signal and displays the converted electric signal in units of temperature. , The light guide body 7 is connected by an optical fiber.

Next, the first embodiment of the temperature measurement sensor pin 1 will be described. Example 1 is shown in FIGS. 7 to 9. The temperature measurement sensor pin 1 of the first embodiment includes a cylindrical body 4B with an annular flange, a light transmitting body 5, a holding body 6B, a light guide body 7, a holding plate 41, and a fixing screw (not shown). A female screw 42b for screwing a fixing screw is engraved on the holding plate 41.

First, the light transmitting body 5 is inserted into the annular flanged cylindrical body 4B, and then the pressing body 6B is screwed in and fastened to attach the light transmitting body 5 to the annular flange 4a of the annular flanged cylindrical body 4B. Press and fix. After that, the optical fiber which is the light guide body 7 is inserted into the through hole 12 provided in the axial center of the pressing body 6B and brought into contact with the light transmitting body 5. In this state, in order to fix the optical fiber to the cylindrical body 4B with an annular flange, insert the optical fiber into the cylindrical body 4B with an annular flange by sandwiching the optical fiber between two pressing plates 41, and insert the pressing plate 41 into the cylindrical body 4B with an annular flange with a total of four fixing screws. It is fixed to the cylindrical body 4B with an annular flange.

The temperature measurement sensor pins 1 shown in FIGS. 8A and 8B are installed so that the tip surface 4b coincides with the inner wall surface 35 of the mold or the like as shown in FIG. Then, the infrared rays from the molten metal of the temperature-measured body 70 injected into the cavity 33 such as in the mold are guided from the light transmitter 5 to the optical fiber of the light guide body 7, and converted into temperature by the measurement main body 3.

Next, the second embodiment of the temperature measurement sensor pin 1 will be described. Example 2 is shown in FIGS. 3 to 5. The temperature measuring sensor pin 1 of the second embodiment includes a cylindrical body 4A with an annular flange, a light transmitting body 5, a holding body 6A, a light guide body 7, and a fixing screw (not shown). A female screw 42a for screwing a fixing screw is engraved on the presser body 6A.

The cylindrical body 4A with an annular flange has a female screw 4d engraved on the inner peripheral surface on the outer side, and has a cap shape. Two or more holes 11 into which the protrusions of the special tool can be inserted are provided on the inner surface of the annular flange 4a of the cylindrical body 4A with an annular flange. When the protrusion of the special tool is inserted into the hole 11 and rotated, the cap-shaped cylindrical body 4A with an annular flange can be easily separated from the pressing body 6A, so that the light transmitting body 5 can be easily replaced. Since the mold can be replaced while it is installed on the production line without being removed from the production line and moved, the replacement time can be significantly shortened, and the loss time of setup time can be reduced.

The presser body 6A has an end surface on the inner side abutting on the light transmitting body 5, an end surface on the outer side having a length up to substantially the same position as the outer surface of the wall portion, and a light guide body 7 at the axial center portion. A through hole 12 having an inner diameter substantially the same length as the outer diameter of the above is formed, and a male screw 6a is screwed in a range to be screwed with the cylindrical body 4A with an annular flange on the inward side. Then, a stepped portion 13a is formed on the outer peripheral surface of the pressing body 6A on the outer side, and a stepped expansion portion having an outer peripheral dimension larger than the outer peripheral dimension on the inward side is formed. A stepped hole (not shown) is also formed in the wall portion at this stepped portion, and the surfaces of the stepped portion are brought into contact with each other so that the inner wall surface 35 of the wall portion and the tip of the cylindrical body 4A with an annular flange are brought into contact with each other. The surface 4b is designed to be the same surface. Further, two female screws 42a for screwing the fixing screws are engraved in the stepped expansion portion, and the fixing screws are screwed into the female screws 42a for screwing the fixing screws to guide the light guide body 7. To fix. The length of the presser body 6A is not limited to the length of the end face on the outer direction side to substantially the same position as the outer surface of the wall portion in a state where the end face on the inner direction side is in contact with the light transmitting body 5. You may.

As an assembly method, first, the light transmitting body 5 is inserted into the cylindrical body 4A with an annular flange, and then the pressing body 6A is screwed in and fastened to fasten the light transmitting body 5 to the annular flange of the cylindrical body 4A with an annular flange. Press and fix against 4a. After that, the optical fiber which is the light guide body 7 is inserted into the through hole 12 provided in the axial center of the pressing body 6A and brought into contact with the light transmitting body 5. In this state, in order to fix the optical fiber of the light guide body 7 to the pressing body 6A, the fixing screw is screwed into the female screw 42a for screwing the fixing screw to fix the light guide body 7.

Next, the temperature measuring sensor 2 is provided with the temperature measuring sensor pin 1, and the light guide body 7 is used as an optical fiber, and the temperature of the temperatureed body to be measured is measured from two infrared wavelengths predetermined by the measuring main body 3. It is preferable that the thermometer is a two-color contrast thermometer that can be used. Using the two-color contrast thermometer, it was confirmed that correction was unnecessary. As a result, in the case of a monochromatic thermometer, it is possible to eliminate the troublesomeness of having to make corrections based on the emissivity of the temperature to be measured, and to obtain an accurate temperature.

Next, in order to accurately measure the molten metal temperature, it is necessary not to detect the temperature of the cylindrical body 4 with an annular flange at the tip of the temperature measuring sensor pin 1 whose temperature has risen due to repeated molding. A method for not detecting the temperature of the cylindrical body 4 with an annular flange will be described.

First, as an explanatory diagram for explaining the dimensional configurations of the cylindrical body 4 with an annular flange, the light transmitting body 5, and the pushing body 6 of the temperature measuring sensor pin 1, the figure shown in FIG. 10 is used, but it is difficult to understand because it is a diagonal line showing a cross section. This will be described with reference to FIG. 11 in which the diagonal lines in FIG. 10 are eliminated. In FIG. 11, assuming that the inner diameter of the annular flange: d, the thickness of the annular flange: L, the thickness of the light transmitting body: T, the focusing angle of the light guide body: θ, and the outer diameter of the light guide body: D, the following equation ( 1) holds. The size of the hole diameter of the annular flange 4a that does not lack the field of view can be obtained by the following formula (1).
d ≧ 2 (L + T) tan (θ / 2) + D ... (1)

Next, when the optical fiber diameter was 0.4 mm and the condensing angle was 45 °, the temperature measurement accuracy was confirmed by changing the inner diameter of the annular flange: d, the thickness of the annular flange: L, and the thickness of the light transmitter: T. The results are shown in Table 2.

From Table 2, Experiment No. A has no lack of field of view, no damage to the glass windows of the annular flange 4a and the light transmitter 5 is observed, the temperature accuracy is good, and Experiment No. B has an annular flange because the inner diameter d of the annular flange is small. Since the temperature of 4a was also measured, accurate temperature measurement is impossible. Experiment No. C has no lack of field of view, but due to insufficient strength of the annular flange 4a, molten metal is inserted between the cylindrical body 4 with the annular flange and the light transmitter 5. Experiment No. D has no field loss, but there is a problem that the durability is low because the glass of the light transmitter 5 is thin, and Experiment No. E has no field loss and has good temperature accuracy and durability. , Experiment No. 10 has a problem that the recess 10 is poorly cast and the measurement temperature becomes inaccurate due to a pool of hot water. The numbering chi has a problem that the inner diameter d of the annular flange is large and the cooling rate of the casting of the object to be measured 70 is slow and measured.

From the results in Table 2, in addition to the requirement that the visual field is not lost obtained by the formula (1), the durability strength of the annular flange 4a and the light transmitter 5 and the size of the contact area of the temperature-measured body 70 with the molten metal are also measured. Since it affects the accuracy, the maximum value is set with reference to the experiment number (e), the minimum value is set with reference to the experiment number (e), and as shown in FIG. 12, the component of the temperature measuring sensor pin 1 The range of dimensions was set.

For example, when the optical fiber diameter of the light guide body 7 is 0.4 mm and the condensing angle is 45 °, the thickness of the annular flange 4a is insufficient in the region N1 of 1.0 mm or less, and the casting is poor in the region N2 of 5 mm or more. The thickness of the glass of the light transmitter 5 is insufficient in the strength of the glass when the region N3 is 3 mm or less, and when the region N4 is 10 mm or more, the inner diameter d of the annular flange is in the range of 10 mm or more according to the formula (1). The contact area becomes large and the cooling of the casting becomes slow. Further, in the formula (1), the glass thickness T of the light transmitting body 5 and the thickness L of the annular flange 4a are entered to remove the range in which the hole diameter d is 10 mm or more.

From the results, as shown in FIG. 12, considering the limitation of the equation (1), the filling property of the die-cast mold 30 into the cavity 33, and the like, each dimension of the practical temperature measurement sensor pin 1 is set to the light guide body. When the optical fiber diameter of No. 7 is 0.4 mm and the condensing angle is 45 °, the desirable region M is that the inner diameter d of the annular flange 4a is more than 4 mm and less than 10 mm, the thickness L of the annular flange 4a is more than 1 mm and less than 5 mm, and the light transmitter. The thickness T of 5 was set to be more than 3 mm and less than 10 mm. Since the desired region M changes depending on the optical fiber diameter and the focusing angle, it is set in various combinations.

Next, the molten aluminum alloy melted at 680 ° C. in a holding furnace is scooped up with a ceramic radle 75, discharged into the sleeve 72, extruded at about 80 MPa, and at a speed of 0.3 mm / s to 3.0 mm / s. It was molded in a die casting die 30 and the temperature of the solidification process at that time was measured. As a temperature measuring meter, the case of a thermocouple is shown in FIG. 13, the case of an immersion type optical fiber is shown in FIG. 14, and the case of a temperature measuring sensor 2 equipped with the temperature measuring sensor pin 1 of the present invention is shown in FIGS. 15 and 16. show.

First, it is a temperature measurement result in the cavity 33a of the die casting mold 30 using a thermocouple. When the temperature measuring contact of the thermocouple is installed in the die casting die 30, the contact of the molten metal at the temperature measuring contact is detected in the first measurement shown in FIG. 13 (a) as shown in the solidification curve P1. After about 1 second, the molten metal flows in and the temperature rises to 400 ° C due to the steep slope, and the temperature gradually decreases from about 1.8 seconds after drawing a gentle curve with a mountain, and after about 5 seconds it reaches about 280 ° C. You can see that it is showing. However, since the response speed of the thermocouple is slow, for example, in the case of the same molten metal, even though the maximum temperature was detected up to about 620 ° C., the maximum temperature could only be detected up to 400 ° C. Further, since the temperature measuring contact of the thermocouple was damaged in the first molding, as shown in the solidification curve P2 of FIG. 13 (b) showing the second time and the solidification curve P3 of FIG. 13 (c) showing the third time, 2 The temperature has not been detected since the first time.

Next, it is a temperature measurement result in the die casting mold 30 using the immersion type optical fiber having a temperature measurement range of 300 ° C. to 800 ° C. When the temperature measuring contact of the immersion type optical fiber is installed in the die casting mold 30, the temperature measuring contact of the optical fiber comes into direct contact with the molten metal, and as shown in the solidification curve P4 in the first measurement shown in FIG. 14 (a). After about 1 second, it was confirmed that the temperature had risen to around 530 ° C almost vertically at once, and the measurement was possible with good response. This substantially vertical rise indicates that the optical fiber of the infrared thermometer is more responsive than the thermocouple. It can be seen that the temperature gradually decreased immediately after reaching the maximum temperature, and decreased to about 300 ° C. 5 seconds later. However, since the temperature measuring contact was damaged in the first molding, the correct measurement could not be performed as shown in the solidification curve P5 after the second time shown in FIG. 14 (b), and the third time shown in FIG. 14 (c). In the molding, no molten metal was detected as shown in the solidification curve P6.

Next, it is a temperature measurement result in the die cast mold 30 using the temperature measurement sensor 2 equipped with the temperature measurement sensor pin 1 of the present invention having a temperature measurement range of 300 ° C. to 1000 ° C. This temperature measurement was carried out by the temperature measurement sensor 2 shown in FIGS. 7 to 9. In the temperature measurement by the temperature measuring sensor 2 equipped with the temperature measuring sensor pin 1 of the present invention, when the first solidification curve P7 shown in FIG. It can be seen that the temperature dropped to 1.3 seconds after 1.3 seconds with a gentle slope, then dropped to 300 ° C after about 3 seconds in a steep curve. This vertical sudden rise in temperature indicates that the optical fiber of the infrared thermometer is more responsive than the thermocouple.

Then, the second solidification curve P8 shown in FIG. 15 (b), the third solidification curve P9 shown in FIG. 15 (c), the 98th solidification curve P10 shown in FIG. 16 (a), and FIG. 16 (b). The 99th solidification curve P11 and the 100th solidification curve P12 shown in FIG. 16 (c) show substantially the same solidification curve as the first solidification curve P7 shown in FIG. 15 (a), and each molding shows. It can be seen that the temperature can be measured stably with. Although not shown, it was also confirmed that the temperature measurement was stably performed after the 100th time.

1 Temperature measurement sensor pin 2 Temperature measurement sensor 3 Measurement body 4 Cylindrical body with annular flange 4A Cylindrical body with annular flange 4B Cylindrical body with annular flange 4a Circular flange 4b Tip surface 4d Female screw 5 Light transmitter 5a Peripheral part 6 Presser body 6A Presser body 6B Presser body 6a Male screw 7 Light guide body 10 Recession 11 Hole 12 Through hole 13 Stepped part 30 Die cast mold 31 Fixed mold 32 Movable mold 33 Cavity 33a Cavity 33b Hot water pool 33c Hot water passage 35 Inner wall surface 41 Presser Plate 42 Fixing screw Female screw for screwing 50 Adhesive 51 Cylindrical body 52 Cylindrical body with annular flange 53 Cylindrical body with annular flange 61 Presser body 62 Presser body 70 Heated body 71 Piston 72 Sleeve 75 Ladle P Solidification curve

Claims (8)

A temperature measurement sensor pin that fits a melted resistance temperature detector into a through hole drilled in the wall of a cavity that can flow or fill.
The temperature measurement sensor pin includes a cylindrical body with an annular flange having an annular flange extending radially inward from one end edge of the cylinder.
It is pressed against the outer side flange surface of the wall portion of the annular flange in a surface contact state to form a hole and a recess of the annular flange, and is less than the inner diameter of the tubular portion of the cylindrical body with the annular flange. A pillar-shaped light transmitter that has the outer width of and is capable of transmitting light,
A temperature measuring sensor pin comprising: a presser body for pressing the outer side surface of the light transmitting body toward the annular flange direction. The temperature measurement sensor pin according to claim 1, wherein both end surfaces on the inner side and the outer side of the wall portion of the light transmitter have parallel planes. By screwing a male screw screwed on the outer peripheral surface of the presser foot on the inner side and a female screw screwed on the inner peripheral surface of the cylindrical body with an annular flange, the presser foot is screwed. The temperature measuring sensor pin according to claim 1 or 2, wherein the light transmitting body is pressed against the flange surface on the outward side of the annular flange. The temperature measurement sensor pin is extruded on the wall of the mold forming the cavity, on the wall of the pipe forming the runner, or extruded with the tip end facing inward and the other end facing outward. It can be fitted into a through hole formed in the wall of a sleeve that forms a puddle having means.
The cylindrical body with an annular flange whose tip is directed inward, and the column-shaped light transmitting body.
A long light guide body can be inserted into the axial center portion, and the light guide body has a through hole having an inner diameter substantially the same as the outer diameter of the light guide body, and has an outer diameter substantially the same as the inner diameter of the cylindrical body with an annular flange. With a substantially columnar holding body,
The tip surface of the annular flange on the inner direction side can be fitted so as to be flush with the inner wall surface of the wall portion, and the tip end portion of the light guide body is placed on the outer surface side of the light transmitter. The temperature measuring sensor pin according to any one of claims 1 to 3, wherein a contact is possible. The inner diameter of the annular flange is placed in an optical path based on a preset focusing angle of a long light guide inserted into the axial center of the presser body, and the light transmitting body and the temperature to be measured are measured. The temperature measuring sensor pin according to any one of claims 1 to 4, wherein the size is such that only the body exists. The temperature measurement sensor pin according to any one of claims 1 to 5, wherein the inner diameter of the annular flange is obtained by the formula (1).
d ≧ 2 (L + T) tan (θ / 2) + D ... (1)
Inner diameter of annular flange: d
Annular flange thickness: L
Thickness of light transmitter: T
Focusing angle of light guide: θ
Outer diameter of light guide: D Claims 1 to 6 are characterized in that at least two holes for fitting a protrusion of a screwing / exiting tool of the cylindrical body with an annular flange are provided on the tip surface of the cylindrical body with an annular flange on the inward direction side. The temperature measurement sensor pin described in any of. A temperature measuring sensor comprising the temperature measuring sensor pin according to any one of claims 1 to 7.

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