JP2012223781A - System for controlling temperature of mold - Google Patents

Abstract

Disclosed is a mold temperature control system capable of easily and reliably controlling a mold partly at an arbitrary temperature with a simple configuration.
A mold temperature control system according to the present invention includes a temperature control fluid having diamagnetism, a flow path provided in the mold and through which the temperature control fluid is circulated, and a flow path. Magnetic field forming means 4 is provided on the side opposite to the side on which the temperature control fluid 1 to be circulated is to be deflected. Due to the magnetic field formed by the magnetic field forming means 4, the temperature control fluid 1 flowing through the hole 30 from the inlet 32 a toward the outlet 33 a is deflected so as to repel the magnetic field forming means 4.
[Selection] Figure 1

Description

  The present invention relates to a mold temperature control system, and more particularly to a mold temperature control system that controls the temperature of a mold by causing a temperature control fluid to flow through a flow path provided in the mold. .

  For example, Patent Document 1 is known as a conventional technique for controlling the temperature of a mold. Patent Document 1 discloses a mold temperature control system for a casting mold using cooling water, wherein the casting mold is formed inside a water conduit through which cooling water is passed, and the water conduit The water supply pipe is provided with first temperature detecting means for measuring the temperature of the cooling water before being supplied to the casting mold, and the drain pipe is provided with the casting. A flow rate control means for controlling the flow rate of the cooling water supplied to the casting mold, a flow rate measuring means for measuring the flow rate of the cooling water supplied to the casting mold, and the cooling after being discharged from the casting mold. A second temperature detecting means for measuring the temperature of the water, and is deprived of the casting mold on the basis of the measured value difference of the temperature of the cooling water detected by the first and second temperature detecting means. Calculated heat quantity, and the calculated heat quantity should be taken away from a predetermined product. The flow rate of the cooling water is calculated so that the flow rate of the cooling water supplied to the casting mold is equal to the flow rate of the calculated cooling water. A featured mold temperature control system is disclosed.

  For example, as shown in FIG. 4, the flow path for circulating the temperature control fluid is formed with a hole 30 ′ in the mold 2 ′ and a closing member 31 ′ for closing the opening of the hole 30 ′. In general, a configuration in which an inflow pipe 32 ′ and outflow pipes 33A ′ and 33B ′ are disposed so as to pass through the closing member 31 ′ and open into the hole 30 ′ is known. In the example shown in FIG. 4, the inflow pipe 32 ′ is single, the outflow pipes 33 A ′ and 33 B ′ are provided in pairs, and the tip opening (inlet) 32 a ′ of the inflow pipe 32 ′ is the hole 30. The tip openings (outflow ports) 33a 'of the outflow pipes 33A' and 33B 'are arranged in the vicinity of the base end of the hole 30' so that the temperature control fluid 1 such as cooling water flows. It is comprised so that it may distribute | circulate toward both outflow ports 33a 'and 33a' from the inlet 32a '. In the case of FIG. 4, the inlet 32a 'at the tip of the inflow pipe 32' is formed so as to be inclined. In the figure, the flow rate of the temperature control fluid 1 ′ flowing toward the outlets 33 a ′ and 33 a ′ is conceptually expressed in proportion to the size of the arrows indicated by the symbols FA ′ and FB ′. In the flow path 3 ′ in the temperature control system of the mold 2 ′ shown in FIG. 4, the temperature control fluid 1 ′ flowing from the inlet 32 a ′ in the hole 30 ′ is supplied to both outlets 33 a ′ and 33 a ′. (The arrows FA ′ and FB ′ are shown with substantially the same size).

JP 2010-194586 A

  However, in the conventional temperature control system configured as shown in FIG. 4, the temperature control fluid 1 ′ flowing from the inlet 32a ′ in the hole 30 ′ is directed toward the outlet 33a ′ of the one outlet pipe 33A ′. The actual flow rate flowing through and the actual flow rate flowing toward the outlet 33a ′ of the other outflow pipe 33B ′ are not equal as set, for example, as shown in FIG. The flow rate (FA) to the outflow port 33a 'of the right outflow tube 33A' is large, and the flow rate (FB) to the outflow port 33a 'of the right outflow tube 33B' is small.

  Furthermore, in the prior art, as indicated by an arrow F ′ in FIG. 6, the temperature control fluid 1 ′ flows away from the inner wall surface of the hole 30 ′ in the hole 30 ′. There is also a problem that a sufficient temperature control effect cannot be obtained because the temperature control fluid 1 ′, which is no longer at a predetermined temperature, stays between the inner wall surface of 30 ′.

  As described above, in the conventional technique, the temperature control fluid 1 ′ distributed in each part in the flow path 3 ′ cannot be controlled to the arbitrary flow rate. Therefore, in the conventional technique, the temperature control effect for each part of the mold 2 ′ in which the flow path 3 ′ is formed cannot be arbitrarily adjusted, and as a result, the mold 2 ′ can be reliably set to a desired temperature. There was a problem that it was difficult to control. In the conventional technique, generally, the temperature control fluid 1 'is circulated evenly in the flow path 3' to reduce the difference in the flow rate of the temperature control fluid 1 'as much as possible. In order to reduce the retention of 1 ′ near the inner wall surface of the flow path 3 ′, it was necessary to send the temperature control fluid 1 ′ to the inflow pipe at a relatively high pressure.

  The present invention has been made in view of the above-described problems, and provides a mold temperature control system capable of easily and reliably controlling a mold partially at an arbitrary temperature with a simple configuration. With the goal.

  In order to achieve the above object, an invention relating to a mold temperature control system according to claim 1 includes a temperature control fluid having diamagnetism, a flow path provided in a mold and through which the temperature control fluid flows, and It is characterized by comprising magnetic field forming means provided on the opposite side to the side on which the temperature control fluid circulated in the flow path is to be deflected.

  According to the first aspect of the present invention, when the temperature control fluid having a predetermined temperature having diamagnetism flows through the flow path, it repels the magnetic field forming means and is deflected to the opposite side of the magnetic field forming means. . Therefore, the mold can be partially and arbitrarily controlled at an arbitrary temperature easily and reliably.

It is sectional drawing shown in order to demonstrate 1st Embodiment of the temperature control system of the metal mold | die of this invention. It is sectional drawing shown in order to demonstrate 2nd Embodiment of the temperature control system of the metal mold | die of this invention. 3 is a graph showing a comparison of temperature changes with time in a mold temperature control system according to the present invention and a mold temperature control system according to a conventional technique. FIG. 5 is an explanatory diagram for explaining a theoretical flow rate of a temperature control fluid in a mold temperature control system according to a conventional technique. In the temperature control system of the metal mold | die by a prior art, it is explanatory drawing shown in order to demonstrate the flow volume of actual temperature control fluid. In the temperature control system of the metal mold | die by a prior art, it is explanatory drawing shown in order to demonstrate the state in which the temperature control fluid flows away from the inner wall face of a hole in a hole.

One embodiment of the mold temperature control system of the present invention will be described with reference to FIG. 1 in the case of a mold for cooling a mold used for casting or the like. The same reference numerals are given to the same components or corresponding components.
The mold temperature control system of the present invention generally includes a temperature control fluid 1 having diamagnetism, a flow path 3 provided in the mold 2 and through which the temperature control fluid 1 flows, and a flow in the flow path 3. Magnetic field forming means 4 provided on the opposite side to the side on which the temperature control fluid 1 is to be deflected.

  In the case of this embodiment, the temperature control fluid 1 employs water (in the following description, the temperature control fluid may be referred to as cooling water). Water has diamagnetism that repels magnetic fields. The temperature control fluid 1 is adjusted to a predetermined temperature, but is not limited to water, and can be a liquid or gas containing a diamagnetic substance.

  The mold 2 is composed of a plurality of pieces and is provided so as to be opened and closed. Then, by closing the molds 2 to each other, a cavity having a predetermined shape is formed inside, and the cavity is filled with a molding material having fluidity at a predetermined temperature. In the embodiment shown in FIG. 1, a hole 30 is formed in the mold 2. The hole 30 is formed so that the tip thereof reaches a predetermined distance from the cavity surface. And the opening part of the base end side of the hole 30 is obstruct | occluded by obstruction | occlusion members 31, such as a cover plate or a plug material. The closing member 31 is provided with a single inflow pipe 32 and a pair of outflow pipes 33A, 33B so as to penetrate in a watertight state.

  The inflow pipe 32 is disposed substantially at the center of the cross section of the hole 30, and the inflow port 32 a extends so as to be positioned near the tip of the hole 30. In the case of this embodiment, the inlet 32a at the tip of the inflow pipe 32 is formed so as to be inclined in the same manner as in the conventional technique for comparison with the conventional technique shown in FIGS. . In addition, the outflow pipes 33A and 33B are arranged symmetrically around the inflow pipe 32 in the cross section of the hole 30, and the outflow port 33a is located in the vicinity of the base end side closed by the closing member 31 of the hole 30. It is inserted and arranged to the extent. In this embodiment, the flow path 3 is constituted by the hole 30 formed in the mold 2, the closing member 31 that closes the opening of the hole 30, and the inflow pipe 32 and the outflow pipes 33A and 33B. . The inflow pipe 32 is connected to a supply pipe for supplying the cooling water 1 having a predetermined temperature at a predetermined flow rate and a predetermined pressure by a pump or the like, and the outflow pipes 33A and 33B are cooled from the inside of the hole 30. A discharge pipe for discharging the water 1 to a tank or a discharge path is connected.

  A recess 20 is formed in the vicinity of the periphery of the hole 30 in the mold 2 and on the side of one outflow pipe (the left outflow pipe 33A in FIG. 1). As a permanent magnet 4. Depending on conditions such as the magnitude of the magnetic force of the permanent magnet 4, the flow rate and pressure of the cooling water 1, the temperature of the mold 2 and the temperature distribution thereof, the flow rate of the cooling water 1 is uniform throughout the hole 30 or within the hole 30. The permanent magnet 4 may be provided so as to surround one side around the hole 30 or may be partially provided on one side around the hole 30 so that the flow rate is intentionally different. Good.

  Due to the magnetic field formed by the permanent magnet 4, the cooling water 1 flowing through the hole 30 from the inlet 32 a toward the outlet 33 a is deflected so as to repel the permanent magnet 4. Here, in the conventional technique shown in FIG. 4, the flow rate of the cooling water 1 ′ actually discharged from the outlet 33a ′ is shown as the flow rate of the cooling water 1 ′ is indicated by the size of the arrows FA ′ and FB ′. Although the flow rate is set so that the cooling water 1 flows at substantially the same flow rate toward the outflow port 33a ′ of both outflow pipes 33A ′ and 33B ′ as shown in FIG. As described above, the outlet 33a ′ of the outlet pipe 33A ′ on one side (left side in the figure) is larger than the outlet 33a ′ on the other side (right side in the figure) of the outlet pipe 33B ′. There was a difference in the discharge amounts of the outlets 33a ′ of 33A ′ and 33B ′. On the other hand, in the present invention, even though the inflow port 32a and the outflow ports 33a and 33a are set under substantially the same conditions as those of the prior art shown in FIGS. 4 and 5, the embodiment shown in FIG. As a result of repelling the permanent magnet 4 provided on the left side and trying to circulate the cooling water 1 through the hole 30, both the cooling water 1 does not need to be fed into the inflow pipe 32 at a high pressure as in the prior art. The cooling water 1 can be flowed out from the outflow port 33a of the outflow pipes 33A and 33B at a substantially equal flow rate. Therefore, the left and right sides in FIG. 1 of the hole 30 of the mold 2 can be cooled as set.

  The present invention is not limited to flowing the temperature control fluid 1 at the same flow rate from the single inlet 32a toward the pair of outlets 33a, 33a. Both outflow pipes so that the flow rate of the temperature control fluid 1 flowing toward the outflow port 33a is intentionally larger than the flow rate of the temperature control fluid 1 flowing toward the outflow port 33a of the other outflow pipe 33B or 33A. It is also possible to make a difference in the outflow amounts of the outlets 33a and 33a of 33A and 33B.

  Next, a second embodiment of the present invention will be described with reference to FIG. Note that portions that are the same as or correspond to those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  In the embodiment shown in FIG. 1, the permanent magnet 4 is disposed around the hole 30 of the mold 2, whereas in the embodiment shown in FIG. 2, the permanent magnet 4 is provided in the inflow pipe 32. Is provided.

  As shown in FIG. 2, in this embodiment, the permanent magnet 4 is provided inside the inflow pipe 32. Therefore, the cooling water 1 that has flowed into the hole 30 from the inflow port 32a repels the permanent magnet 4 in the inflow pipe 32, and as shown by the arrow F in FIG. 2 (the arrow F ′ shown in FIG. 6). ), And flows toward the outlets 33a and 33a so as to be in close contact with the inner wall surface of the hole 30. Therefore, the cooling effect of the mold 2 can be improved. In this embodiment, since the cooling water 1 flows so as to be in close contact with the inner wall surface of the hole 30, the outflow pipes 33 </ b> A and 33 </ b> B have their outlet ports 33 a and 33 a opened near the inner peripheral wall surface of the hole 30. Has been placed.

  The present invention is not limited to this embodiment, and the permanent magnet 4 can be provided outside the inflow pipe 32. Further, the magnetic field forming means 4 is not limited to a permanent magnet, and a coil that forms a magnetic field by supplying a current can also be adopted. It can also be configured to form. The flow path 3 includes a hole 30 formed in the mold 2, a closing member 31 that closes the hole 30, an inflow pipe 32 that supplies the temperature control fluid 1 into the hole 30, and temperature control from within the hole 30. The configuration is not limited to the configuration including the outflow pipes 33A and 33B through which the fluid 1 flows out, and the temperature control fluid 1 can also be configured to be supplied / discharged directly to the pipe formed in the mold 2. . Furthermore, the temperature control fluid 1 is not limited to cooling water, but can be heated to a predetermined temperature to keep the mold 2 warm.

  FIG. 3 is a graph of experimental results shown to compare the temperature control system according to the present invention configured as described above (shown by a solid line) with the temperature control system according to the prior art (shown by a chain line). It is a graph which shows the change of temperature. As is apparent from this graph, the temperature control system according to the present invention is compared with the temperature control system according to the prior art from the temperature of the mold 2 (for example, 400 ° C.) to a predetermined temperature (for example, 200 ° C.). It was possible to cool in a short time.

  The present invention can be applied to, for example, a mold that requires temperature control so as to cool or keep warm, such as a mold for injection molding such as resin molding, in addition to a mold for casting such as die casting. .

  1: cooling water (temperature control fluid), 2: mold, 3: flow path, 4: permanent magnet (magnetic field forming means), 20: recess, 30: hole, 32: inlet pipe, 32a: inlet, 33A, 33B: Outflow pipe, 33a outlet

Claims (1)

A temperature control fluid having diamagnetism;
A flow path provided in the mold and through which the temperature control fluid flows;
A mold temperature control system, comprising: a magnetic field forming unit provided on a side opposite to the side on which the temperature control fluid distributed in the flow path is to be deflected.

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