JPH078739U - Temperature sensor - Google Patents

Abstract

(57) [Summary] [Purpose] A temperature sensor for measuring the heat flux from the die of a die casting machine does not have a restriction on the mounting position on the die and is easy to manufacture and can be attached to and detached from the die. To do. [Structure] Holes or grooves (2, 3) for attaching the constantan wire are formed in the axial direction of the push pin or the insert (1), and the thermocouple minus legs are formed at two different distances from the mold cavity surface. Constantan line (4,
5) are joined, and the push pin or the nest itself is used as the + leg of the thermocouple.

Description

[Detailed description of the device]

[0001]

[Prior art]

 The measurement of the heat flux of the die is necessary for the temperature control of the die, the discovery and prediction of abnormalities in the casting process in die casting machines, and the judgment of product quality. In order to measure the heat flux, it is necessary to measure the temperature at two different distances in the depth direction from the mold cavity surface. Therefore, the conventional method is to insert multiple sheath thermocouples in the mold, A method of welding a K thermocouple (JIS C1602) to an extrusion pin or a nest has been adopted.

[0002]

[Problems to be solved by the device]

 However, when trying to measure the heat flux by inserting the sheath thermocouple directly into the mold, there is a problem that the installation location of the measurement position is restricted. When using a sheath thermocouple, it is necessary to make an insertion hole from the outer wall surface of the mold to the target position, but the position of the insertion hole can be freely selected from the positional relationship of the core and cooling holes. Can not. Also, the installation position is restricted by the sheath diameter, such as when you want to shorten the distance from the cavity surface or the distance between two contacts. Further, a gap may be formed between the tip of the sheath thermocouple and the insertion hole, which may cause an error because it cannot be calibrated in the state of being attached to the mold.

When measuring a heat flux by welding a K thermocouple to an extruding pin or a nest, it is necessary to insulate the four wires of the thermocouple and dispose them on the extruding pin or the nesting pin. There is a problem that requires the technology of.

An object of the present invention is to provide a temperature sensor that has few restrictions on the mounting position, is easy to manufacture, and is removable from the mold.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a constantan wire is joined to two points having different distances from the die cavity surface of the extrusion pin or the nest, and the constantan wire and the extrusion pin or the nest form a thermocouple. Provide a temperature sensor.

[0006]

[Action]

 A hole or groove for attaching the constantan wire is formed in the axial direction of the extruding pin or the insert, and the constantan wire to be the −leg of the thermocouple is joined to two points at different distances from the mold cavity surface, and the extruding pin or the insert itself The thermoelectromotive force is measured with the + leg of the thermocouple.

[0007]

【Example】

 A first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an axial sectional view of a pin-shaped insert 1 and a front view of the insert 1 as seen from the head side. In the axial direction of the insert 1, two thermocouple mounting holes 2 and 3 having a circular cross section are bored in parallel, and the depths of the mounting holes 2 and 3 are made different, and the distance from the deep end of the hole to the cavity surface. Are different. One end of the constantan wires 4 and 5 is welded to the deep ends of the thermocouple mounting holes 2 and 3, and the other ends of the constantan wires 4 and 5 are led out from the head side of the insert 1. A thermocouple is constituted by the constantan wires 4 and 5 and the push pin body. The push pin body is the + leg of the thermocouple, and the constantan wires 4 and 5 are the − legs.

A second embodiment of the present invention is shown in FIG. 2 shows an axial cross-sectional view of the pin-shaped insert 1 as in FIG. 1 and a front view of the insert 1 seen from the head side. On the circumferential surface of the insert 1 in the axial direction, one thermocouple mounting groove 2 having a U-shaped cross section is formed. Constantan wires 3 and 4 are welded to the thermocouple mounting groove 2 at different distances from the cavity surface. It is preferable to fill the voids in the thermocouple mounting groove 2 with a brazing material or the like after insulating the constantan wires 3 and 4. By doing so, the influence of the mounting groove on the heat flux can be reduced. Similar to the first embodiment, the thermocouple is composed of the constantan wires 4 and 5 and the push pin body, and the push pin body is used as the + leg of the thermocouple and the constantan wires 4 and 5 are used as the − leg.

A third embodiment of the present invention is shown in FIG. In this embodiment, two thermocouple mounting grooves 2 and 3 each having a U-shaped cross section are formed on the circumferential surface of the insert 1 at 180 ° apart from each other, and the deep ends of the thermocouple mounting grooves 2 and 3 are formed. Constantan wires 4 and 5 are welded to the portion. The thermocouple mounting grooves 2 and 3 are formed so that their inner ends are displaced from the cavity surface at different positions, and the distances between the welding points of the constantan wires 4 and 5 and the cavity surface are made different. Similar to the second embodiment, the constantan wires 3 and 4 are insulation-coated, and then the gaps of the thermocouple mounting grooves 2 and 3 are filled.

In the embodiment described above, the case where the thermocouple is formed by forming the thermocouple mounting hole or the mounting groove in the nest 1 and welding the constantan wire has been described, but the present invention is not limited to this. However, it can also be applied to extrusion pins used in die casting machines.

[0011]

[Effect of device]

 As described above, according to the present invention, since the + leg of the thermocouple is used as the push-out pin body or the nest body, the only two wires for the thermocouple to be joined are the − leg. , -Compared to the case where four joints were required for all legs, the temperature sensor is easier to manufacture and the sensor can be made smaller. In addition, because the sensor can be made compact, there are fewer restrictions on the mounting position compared to conventional methods. Furthermore, since it can be attached to and detached from the mold, the sensor can be calibrated as a single unit, maintaining a certain level of accuracy and facilitating maintenance.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a temperature sensor according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a temperature sensor according to a second embodiment of the present invention.

FIG. 3 is a view showing a structure of a temperature sensor according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Nest 2 Thermocouple mounting hole (groove) 3 Thermocouple mounting hole (groove) 4 Constantan wire 5 Constantan wire

Claims (1)

[Scope of utility model registration request] 1. A temperature sensor in which a constantan wire is joined to two points having different distances from a die cavity surface of an extrusion pin or a nest, and a thermocouple is constituted by the constantan wire and the extrusion pin or the nest.