JPH07144353A - Temperature control structure of mold - Google Patents

Abstract

PURPOSE:To enable rapid heating/cooling to achieve the shortening of a molding cycle and the enhancement of quality in a mold temp. control structure performing temp. control by passing first and second medil different in temp. through a mold, by reducing the effect of mutual heat capacities of a heating mechanism and a cooling mechanism and enhancing heat transmission efficiency. CONSTITUTION:A mold temp. control structure is equipped with the temp. control chamber 15 adjacent to a cavity 14 through a partition wall 13, the temp. control block 16 inserted in the temp. control chamber 15 capable of coming close to and separating from the partition wall 13, and the first temp control passage 22 in the block 16 receiving the supply of a first heating medium. The heat transfer plate 17 sliding along with the block 16 is provided between the partition wall 13 and the block 16 and, when the block 16 approaches the partition wall 13, the block 16 comes into close contact with the partition wall 13 through the heat transfer plate 17 and, when the block 16 is separated from the partition wall 13, the partition wall 13, the block 16 and the heat transfer plate 17 are respectively separated to set the gap between the partition wall 13 and the heat transfer plate 17 to a second temp. control passage 15a receiving the supply of a second heating medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold temperature control structure, and more particularly, to quickly control the mold temperature by passing a first heat medium and a second heat medium having different temperatures through the mold. The present invention relates to a mold temperature control structure.

[0002]

2. Description of the Related Art Generally, in injection molding of a plasticized resin, the mold temperature has a great influence on the surface transferability of a molded product, and the higher the mold temperature, the higher the surface transferability. However, in order to finally take out the molded product from the mold, it is necessary that the temperature of the molded product at the time of removal is not higher than the heat distortion temperature of the molding resin, so the mold temperature is lower than the heat distortion temperature by about 10 ° C. The temperature is often set as the upper limit, and the surface transferability thereof is limited. Further, when the mold temperature is high, the time until the temperature of the molded product falls below the thermal deformation temperature also becomes long, which causes a problem that the molding cycle becomes long.

In order to improve surface transferability in precision molding without causing such problems, the mold is set to a temperature higher than the heat distortion temperature of the resin before injection / filling of the molding resin, and after injection / filling. Thermal deformation of the mold without lengthening the molding cycle by lowering the mold below the heat deformation temperature, heating the mold above the heat deformation temperature after injection / filling, and then cooling again. A temperature control structure of a mold that realizes heating above a temperature is considered.

The following is a conventional temperature control structure of this type of mold. (1) A pair of temperature adjusting medium passages provided in a mold and a temperature adjusting medium supplying device for supplying a temperature adjusting medium to the passages, and the temperature of the supplying device is appropriately switched . (2) One system of temperature control medium passage provided in the mold, and the temperature control medium of low temperature and high temperature is supplied to the passage 2
A medium supply device for controlling the temperature is provided, and the medium is switched on the way from the supply device to the medium passage (see, for example, JP-A-58-215309 and JP-A-62-208918).

(3) A pair of low temperature medium passages provided in the die, a low temperature medium supply device for supplying a low temperature temperature control medium to the passages, and heating means such as a heater provided in the die. And a heating means for heating the mold, and a cooling means for stopping the operation of the heating means to cool the mold with a low temperature medium. (4) It has two pairs of temperature adjusting medium passages provided in the mold and a temperature adjusting medium supplying device for supplying a high temperature medium and a low temperature medium respectively to the medium passages, and only the high temperature medium is supplied during heating. Supply to the medium passage to heat the mold,
The one in which only the low temperature medium is supplied to the medium passage at the time of cooling so as to cool the die (for example, the actual opening 1-111661).
No. 0 publication).

[0006]

However, in the mold temperature control structure described in the above (1), it takes a long time to raise and lower the temperature of the temperature control medium, so that the molding cycle is extremely difficult. There has been a problem that the quality of the molded product deteriorates as the length increases. Further, in the mold temperature control structure described in the above (2) to (4), since the heating mechanism and the cooling mechanism are provided close to each other in the mold, the heat capacity of each is promptly increased. There is a problem that the mold cannot be cooled or heated, and the molding cycle becomes long.

Therefore, the applicant of the present invention discloses a mold temperature control structure for solving such a problem in Japanese Patent Application Laid-Open No. 5-177640. In this temperature control structure of a mold, a temperature control block having a first temperature control passage into which a first heat medium is supplied is slid in a temperature control chamber adjacent to each other with a partition wall defining a cavity interposed therebetween. The partition wall is brought into contact with and separated from the partition wall, and when separated from the partition wall, the gap between the partition wall and the temperature control block is used as a second temperature control passage to which the second heat medium is supplied.

However, since the contact area between the temperature control block of the partition wall and the second heat medium is small, it has been possible to make it less susceptible to the mutual heat capacities of the heating mechanism and the cooling mechanism. It was not possible to obtain enough heat transfer to heat and cool the mold. Therefore,
The present invention eliminates the influence of the heat capacities of the heating mechanism and the cooling mechanism, and improves the heat transfer efficiency, thereby enabling rapid heating and cooling under appropriate conditions and shortening the molding cycle. In addition, it is an object of the present invention to provide a temperature control structure for a mold that can improve the quality of a molded product.

[0009]

In order to achieve the above-mentioned object, the invention according to claim 1 is such that a temperature control chamber is provided inside the mold adjacent to a cavity with a partition wall of the mold sandwiched between the temperature control chamber and the temperature control chamber. Temperature control of a mold provided with a temperature control block fitted into the partition wall so as to be close to and separated from the partition wall, and a first temperature control passage provided in the temperature control block and supplied with a first heat medium. The structure is provided with a heat transfer plate which is fitted between the partition wall and the temperature control block in the temperature control chamber, and which slides in the temperature control chamber in the same direction as the temperature control block moves. When the temperature control block and the partition wall are in close contact with each other via the heat transfer plate when the temperature control block is separated from the partition wall, the heat transfer plate is separated from the temperature control block and the partition wall when the temperature control block is separated from the partition wall. The gap formed between the heat transfer plate and the partition wall as the second temperature control passage. It is characterized in that it has to supply the second heat medium.

According to a second aspect of the present invention, a concave portion is provided on one side of the contact surface of the heat transfer plate or the partition wall, and a convex portion is provided on the other side, and the contact surfaces including the concave portion and the convex portion are in contact with each other. It is characterized in that it is formed so as to be in close contact without a gap. Claim 3
The invention described is characterized in that a plurality of the concave portions are formed so as to extend in parallel in a predetermined direction, and a plurality of the convex portions are formed so as to extend in parallel in the same direction as the concave portions. is there.

According to a fourth aspect of the present invention, the side surfaces of the concave portion facing each other are formed closer to each other on the bottom side, and the side surfaces facing each other of the convex portion are formed to be closer to each other on the top side. It is what The invention according to claim 5 is characterized in that the depth of the concave portion and the height of the convex portion are formed to be larger than the separation distance between the temperature control block and the partition wall.

According to a sixth aspect of the present invention, the side surface of the opening of the concave portion and the side surface of the top of the convex portion are formed so as to come into close contact with each other when the heat transfer plate is separated from the partition wall, and between the heat transfer plate and the partition wall. It is characterized in that the gap formed in (1) is divided and only the gap formed on the partition wall side is used as the second temperature control passage to supply the second heat medium.

[0013]

According to the first aspect of the invention, the heat transfer plate that slides in the temperature control chamber in the same direction as the temperature control block moves is inserted between the partition wall and the temperature control block in the temperature control chamber. And
The temperature control block is in contact with the partition wall via the heat transfer plate and in close contact with the partition wall, the first heat medium is supplied to the first temperature control passage in the temperature control block, and the first heat medium flows from the first heat medium to the partition wall in the vicinity of the cavity. Heat is transferred. Further, the second heat medium is supplied as a second temperature adjusting passage to the gap formed between the heat transfer plate and the partition wall in a state where the temperature control block, the heat transfer plate, and the partition wall are separated from each other, and the partition wall near the cavity is provided. Heat is transferred from the second heat medium to.

At this time, since the temperature control block is separated from the heat transfer plate when the second heat medium is supplied to the second temperature control passage formed between the heat transfer plate and the partition wall, the temperature control block is separated from the heat transfer plate. There is no heat transfer from the second heat medium to the block, and heat change (temperature change) of the temperature control block is prevented. Then, when the temperature control block and the partition wall are in close contact with each other via the heat transfer plate, the temperature control block is in close contact without heat change and the second heat medium is not supplied between the heat transfer plate and the partition wall. Therefore, the first and second
Heat is efficiently transferred from the heat medium to the partition wall, and the vicinity of the cavity is rapidly heated or cooled as needed.

According to the second aspect of the present invention, a recess is provided on one side of the partition wall near the cavity or the contact surface of the heat transfer plate that is in contact with and separated from the partition wall, and a projection is provided on the other side. The contact surfaces including the contact surfaces are formed so as to closely contact each other without a gap. Therefore, the contact area between the heat transfer plate and the partition wall is increased, and the efficiency of heat transfer to the partition wall by the first and second heat mediums is further increased. Therefore, the vicinity of the cavity is heated or cooled more rapidly as needed.

According to the third aspect of the invention, a plurality of recesses are formed so as to extend in parallel in a predetermined direction, and a plurality of protrusions are formed so as to extend in the same direction as the recesses. Therefore, the groove is formed by the concave portion and the groove is also formed between the adjacent convex portions, and the opposing grooves are formed in parallel. Therefore, the second heat medium supplied to the second temperature control passage in the gap formed between the heat transfer plate and the partition wall is smoothly flowed and uniformly transferred to the partition wall in the vicinity of the cavity.

According to the fourth aspect of the present invention, the side surfaces of the concave portion facing each other are closer to the bottom side, and the side surfaces of the convex portion facing each other are closer to the top side. Therefore, the concave portion is formed in a so-called inverted trapezoidal shape in which the cross-sectional shape becomes wider as it approaches the other side, and the convex portion is formed in a so-called trapezoidal shape in which the cross-sectional shape becomes narrower as it approaches the one side. Therefore, when the temperature control block is brought close to the partition wall, contact between the edges of the concave and convex portions prevents the contact surface from being brought into close contact with each other and is not damaged.

According to the fifth aspect of the present invention, the depth of the concave portion and the height of the convex portion are formed larger than the distance between the heat transfer plate and the partition wall. Therefore, when the heat transfer plate is separated from the partition wall, the top of the convex portion is put in the concave portion,
The second temperature adjustment passage is formed between the convex portions, or in addition to this, the second temperature adjustment passage is also formed between the side surfaces of the concave portion and the convex portion.
Therefore, the supplied second heat medium is effectively brought into contact with the contact surface including the concave portion or the convex portion of the partition wall, and a turbulent flow is generated in the flow of the second heat medium, so that the second heat medium flows to the partition wall. Heat is transferred efficiently.

Further, even when the heat transfer plate is separated from the partition wall, the tops of the projections are in the recesses, so that when the heat transfer plate is brought close to the partition wall, the edges of the recesses and the projections may come into contact with each other. In addition, the contact surfaces cannot be brought into close contact with each other and are not damaged. According to the invention of claim 6,
The side surfaces of the openings of the recesses and the tops of the projections are formed so as to come into close contact with each other when the heat transfer plate is separated from the partition wall, and the gap formed between the heat transfer plate and the partition wall is divided to be formed on the partition wall side. The second heat medium is supplied using only the gap as the second temperature control passage. Therefore, the heat transfer plate in contact with the second heat medium is made a part of the contact surface, heat transfer from the second heat medium to the heat transfer plate is reduced, and heat transfer from the second heat medium to the partition wall is reduced. Efficiency is increased.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show a first structure for controlling the temperature of a mold according to the present invention.
It is a figure which shows an Example, and this Example respond | corresponds to the invention of Claim 1. First, the configuration will be described.

In both figures, 11 and 12 are a pair of molds, and the molds 11 and 12 have substantially the same structure, and abut on each other on the parting surface PL of the partition wall 13 to define a cavity 14. . A runner (not shown) communicating with the cavity 14 is formed in the mold 11, and these molds 11 and 12 inject and fill the resin into the cavity 14 from the nozzle of the injection molding machine (not shown) via the runner. Then, the molded product is molded. Each of the molds 11 and 12 has a temperature control chamber 15 defined inside thereof adjacent to the cavity 14 with a partition wall 13 interposed therebetween. The temperature control chamber 15 includes a temperature control block 16 and a heat transfer chamber 15. Board
17 is slidably inserted (inserted).

The temperature control block 16 is driven by a hydraulic cylinder 21 and moves in the left-right direction in the drawing so as to come into contact with the partition wall 13 via a heat transfer plate 17 and come into close contact therewith, as shown in FIG. At this time, the contact surface 13a of the partition wall 13 and the heat transfer plate
The contact surface 17 a of the heat transfer plate 17 comes into contact with the contact surface 17 a of the temperature control block 16, and the contact surface 17 a of the temperature control block 16 comes into contact with the contact surface 17 a. The temperature control block 16 is separated from the heat transfer plate 17, as shown in FIG. The temperature control block 16 is provided with a first temperature control passage 22, and a first heat medium is supplied to the first temperature control passage 22 from a first temperature control system (not shown). There is.

As shown in FIG. 2, the temperature control block 16 has a flange 18 penetrating the heat transfer plate 17 and insertable into the partition wall 13.
At least one shaft 18 having a and 18b is fixedly provided, and the distance between the flanges 18a and 18b of the shaft 18 is formed wider than the thickness of the heat transfer plate 17, and the flange 18a is in contact with the temperature control block 16. The flange 18b is formed at a position separated from the surface 16a by a thickness larger than that of the heat transfer plate 17, and at a position in contact with the contact surface 16a.

The flanges 18a and 18b of the shaft 18 are inserted into the insertion holes 13c formed in the partition wall 13 when the temperature control block 16 moves so as to contact the partition wall 13 via the heat transfer plate 17. Further, the flange 18b is inserted into the insertion hole 17c formed in the heat transfer plate 17 so as not to prevent the temperature control block 16, the heat transfer plate 17 and the partition wall 13 from coming into close contact with each other. On the other hand, when the temperature control block 16 is moved away from the partition wall 13, the contact surface 16a of the temperature control block 16 is separated from the contact surface 17b of the heat transfer plate 17, and then the flange 18a is inserted into the insertion hole 13c of the partition wall 13. The contact surface 17a of the heat transfer plate 17 is contacted with and separated from the contact surface 13a of the partition wall 13.

As the temperature control block 16 moves, the heat transfer plate 17 comes into contact with the partition wall 13 formed in the temperature control chamber 15 when it is separated from the partition wall 13, as shown in FIG. 1 (b). Face 13
a and the contact surface 17a of the heat transfer plate 17 between the second temperature control passage 15
As a, the second heat medium is supplied from a second temperature control system (not shown). The second heat medium supplied to the second temperature control passage 15a is an inlet provided in the molds 11 and 12.
It is supplied via 23 and is collected via the outlet 24.

The through hole of the heat transfer plate 17, the insertion hole 13c of the partition wall 13 and the shaft 18 are in sliding contact with each other via a seal material (for example, an O-ring), and the second heat medium from the second temperature control passage 15a. To prevent leaks. Further, 25 is a side plate, 26 is a back plate, the side plate 25 and the back plate 26 define a temperature control chamber 15 together with the partition wall 13, and the side plate 25 and the heat transfer plate 17 are slid via the sealing material. In contact with each other, leakage of the second heat medium from the second temperature control passage 15a is prevented.

Next, the first temperature control passage 22 is supplied to the first temperature control passage 22.
The heat medium is a high temperature heat medium, and the second heat medium supplied to the second temperature adjusting passage 15a is a low temperature heat medium. The action when adjusting to is explained. First, during injection filling, as shown in FIG. 1A, the temperature control block 16 is a heat transfer plate.
The high-temperature heat medium is supplied to the first temperature adjustment passage 22 in a state of being in contact with the partition wall 13 via 17, and the partition wall 13 is kept at a high temperature in accordance with the temperature of the molding resin in the cavity 14.

Next, after the injection filling is completed, as shown in FIG. 1 (b), the temperature control block 16 is separated from the partition wall 13 to form a partition wall.
A second temperature control passage 15a is formed in the gap between the heat transfer plate 17 and the heat transfer plate 17,
The low temperature heat medium is supplied to the second temperature adjusting passage 15a through the inflow port 23 to cool the partition wall 13, and at the same time, the molding resin in the cavity 14 is cooled via the partition wall 13. At this time, the temperature control passage 22 is filled with the high-temperature heat medium, but the temperature control block is
Since 16 is separated from the heat transfer plate 17 and the vicinity of the cavity 14 is only the partition wall 13 to reduce the heat capacity, the molded product of the cavity 14 is quickly cooled without being affected by the high temperature heat medium. In addition, the temperature control block 16 and the partition
Since 13 is separated and heat is not transferred from the high temperature heat medium, the high temperature heat medium can be supplied to the first temperature adjustment passage 22 even during cooling.

After the molded product is taken out, the temperature control block 16 contacts the heat transfer plate 17 and the low temperature heat medium in the second temperature control passage 15a is discharged through the outlet 24 as shown in FIG. 1 (a). While contacting the partition wall 13 via the heat transfer plate 17,
The temperature quickly returns to the initial high temperature. At this time, the temperature control block 16 keeps the high-temperature heat medium flowing through the first temperature control passage even during cooling.
Since it was supplied to 22 and kept at high temperature, it is rapidly brought to high temperature.

As described above, according to this embodiment, the partition wall 13 is provided in a state where the temperature control block 16 is in close contact with the partition wall 13 via the heat transfer plate 17.
Since the heat is transferred from the high temperature heat medium to the partition wall 13 in the state where the temperature control block 16 is separated from the heat transfer plate 17, the mutual influence of the heat media can be eliminated. Further, since the low temperature heat medium is brought into direct contact with the partition wall 13 and the temperature control block 16 is brought into contact with the partition wall 13 via the heat transfer plate 17, the first temperature control passage 22 is brought close to the cavity 14,
Heat can be transferred from the heat medium to the vicinity of. Therefore, the vicinity of the cavity 14 can be rapidly heated or cooled as required, and the molding cycle can be shortened while heating to the mold temperature that improves the surface transferability of the molded product. Furthermore, by reducing the plate thickness of the heat transfer plate 17, it is possible to reduce the heat capacity of the heat transfer plate 17 to improve the cooling rate of the partition wall 13 by the low temperature heat medium, and also to reduce the heat capacity of the heat transfer plate 17. At the same time, the heat transfer distance of the high-temperature heat medium from the temperature control block 16 is shortened, so that the heating rate of the partition wall 13 can be improved.

The temperature of the partition wall 13 may be adjusted by using a low temperature heat medium as the first heat medium and a high temperature heat medium as the second heat medium. In this case, not the rapid cooling but the rapid heating can be performed by the second temperature adjusting passage 15a. In this embodiment, the shaft having the flange is fixed to the temperature control block to move the heat transfer plate, but a spring is interposed between each of the temperature control block, the heat transfer plate, and the partition wall. The heat transfer plate may be moved by another method.

FIG. 3 is a view showing a second embodiment of the mold temperature control structure according to the present invention, and this embodiment corresponds to the invention described in claim 1 or 2. In this embodiment, the same components as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, 27 is a concave portion and 28 is a convex portion.
27 is engraved on the contact surface 13a of the partition wall 13 in a plurality of blocks, and the convex portion 28 is the contact surface 16 of the temperature control block 16 of the heat transfer plate 17.
A plurality of protrusions 28 projecting in a block shape are formed on a, and the recesses 27 and the protrusions 28 are formed in a block shape having substantially the same shape and are arranged so as to face each other at the same position. In addition, the protrusion 28 is formed on the contact surface 13a of the partition wall 13,
The recess 27 may be formed on the contact surface 16 a of the temperature control block 16.

In this embodiment, in addition to the effects of the above-described embodiment, the partition wall 13 and the heat transfer plate 17 are provided with the concave portion 27 and the convex portion 28, and the surface areas of the respective contact surfaces 13a and 17a are increased. At the same time, since the concave portion 27 and the convex portion 28 are formed in a block shape having substantially the same shape and are arranged so as to face each other at the same position, the partition wall 13 and the heat transfer plate 17 are in close contact with each other and the heat transfer plate 17 for the partition wall 13 is closely contacted. The contact area is also increased, and heat is efficiently transferred to the partition wall 13. Therefore, the vicinity of the cavity 14 can be heated or cooled more rapidly.

FIG. 4 and FIG. 5 are views showing a third embodiment of the mold temperature control structure according to the present invention. This embodiment corresponds to the invention described in any one of claims 1 to 3 or 5. To do. In this embodiment, the same components as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG.
37 is a concave portion, 38 is a convex portion, and the concave portion 37 is the contact surface of the heat transfer plate 17.
17a is formed in a groove shape so as to extend in parallel with the inflow direction of the second heat medium, and the convex portion 38 protrudes from the contact surface 13a of the partition wall 13 in substantially the same shape as the concave portion 37. Plural pieces are formed so as to face each other at the same position.

In this embodiment, in addition to the effects of the above-described embodiment, a plurality of recesses 37 formed in the contact surface 17a of the heat transfer plate 17 extend in parallel to the inflow direction of the second heat medium. Since the grooves are formed and a plurality of parallel grooves extending in the same direction are formed between the adjacent convex portions 38 projecting from the contact surface 13a of the partition wall 13, the heat transfer plate 17 and the partition wall are formed. The second heat medium supplied to the second temperature control passage 15a formed between the second heat medium 13 and 13 is smoothly flowed, and the heat of the second heat medium is uniformly transferred to the partition wall 13. Therefore, the partition wall 13 near the cavity 14
Heat can be evenly transferred to the molded product, and the quality of the molded product can be further improved.

As another aspect of this embodiment, FIG.
As shown in (a), the heat transfer plate 17 is brought into contact with the partition wall 13
When the contact surface 17a including 37 and the contact surface 13a including the convex portion 38 are brought into close contact with each other and then the heat transfer plate 17 is separated from the partition wall 13 to define the second temperature control passage 15a, as shown in FIG. ), The distance is set to be less than the depth and height of the convex portions 37 and 38, and the second temperature control passage 15a is defined only by the surfaces of the concave portions and the convex portions 37 and 38. ing. Since FIG. 5 is a cross-sectional view in a direction orthogonal to the inflow direction of the second heat medium, the first temperature control passage 22, the inflow port 23, and the outflow port 24 are not shown.

In this way, by setting the separation distance to be less than the depth and height of the concave portions and the convex portions 37 and 38, the heat transfer plate 17 is divided into partitions.
Even when it is separated from 13, the top of the convex portion 38 is kept in the concave portion 37, the second temperature adjusting passage 15a is formed between the concave portion and the convex portions 37, 38, and the second heat medium is supplied. Effectively contact the contact surface 13a including the convex portion 38 of the partition wall 13 and generate a turbulent flow in the flow of the second heat medium due to the small flow passage area, and the turbulent flow of the second heat medium to the partition wall 13 is generated. The heat can be efficiently transferred.

Further, when the heat transfer plate 17 is brought close to the partition wall 13 again, the edges of the concave portions and the convex portions 37 and 38 do not come into contact with each other, and the contact surfaces 13a and 17a cannot be brought into close contact with each other. It will not be damaged. FIG. 6 is a view showing a fourth embodiment of the mold temperature control structure according to the present invention, and this embodiment corresponds to the invention described in any one of claims 1 to 5. In this embodiment, the same components as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the figure, 47 is a concave portion, 48 is a convex portion, and the concave portion 47 is a groove so that a plurality of concave portions 47 extend in the contact surface 17a of the heat transfer plate 17 parallel to the inflow direction of the second heat medium. The protrusion 48 protrudes from the contact surface 13a of the partition wall 13 and is recessed.
A plurality of 47 are formed so as to face each other at the same position as 47. The recesses 47 are formed so that side surfaces facing each other are closer to each other on the bottom side, which is separated from the partition wall 13.
The cross-sectional shape orthogonal to the inflow direction of the heat medium is formed in a so-called inverted trapezoidal shape, which becomes wider as it gets closer to the partition wall 13. Further, the convex portions 48 are formed such that side surfaces facing each other are closer to each other on the top side closer to the heat transfer plate 17, and the cross-sectional shape orthogonal to the inflow direction of the second heat medium is substantially the same as the cross-sectional shape of the concave portion 47. The shape is formed in a so-called trapezoidal shape that becomes narrower as it gets closer to the temperature control block 16.

In this embodiment, in addition to the effects of the above-mentioned embodiment, the convex portion 48 is formed in a trapezoidal shape, and the concave portion 47 is formed in an inverted trapezoidal shape which is wider than the top of the convex portion 48 and opens. ,
When the heat transfer plate 17 is brought close to the partition wall 13, the edges of the concave portions and the convex portions 47 and 48 do not come into contact with each other, and the contact surfaces 13a and 17a cannot be brought into close contact with each other or are not damaged. .

Further, when the heat transfer plate 17 is separated from the partition wall 13 to define the second temperature control passage 15a, the separation distance is set to be less than the depth and height of the concave portions and the convex portions 47 and 48. Even when the heat transfer plate 17 is separated from the partition wall 13, the second temperature adjusting passage 15a is formed between the side surfaces of the concave portions and the convex portions 47 and 48 with the tops of the convex portions 48 entering the concave portions 47. Then, the supplied second heat medium is effectively brought into contact with the contact surface 13a including the convex portion 48 of the partition wall 13 and the turbulent flow generated by the small flow passage area is generated in the flow of the second heat medium. The heat of the second heat medium can be efficiently transmitted to the partition wall 13.

In this embodiment, the concave portions and the convex portions 47 and 48 are formed so as to extend in the inflow direction of the second heat medium, but they intersect at a predetermined angle (for example, are orthogonal) in the inflow direction. The second temperature control passage 15a may be bent to improve the heat transfer efficiency. FIG. 7 is a view showing a fifth embodiment of the mold temperature control structure according to the present invention, and this embodiment corresponds to the invention described in any one of claims 1 to 5, 5 or 6. In this embodiment, the same components as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 55a denotes a second temperature control passage, and the second temperature control passage 55a contacts the heat transfer plate 17 to the partition wall 13 and includes a contact surface 17a including a concave portion 37 and a convex portion 38. When the heat transfer plate 17 is separated from the partition wall 13 by bringing the temperature control block 16 away from the partition wall 13 after the contact surface 13a is brought into close contact with the partition wall 13 by setting the separation distance to be less than the depth and height of the convex portions 37 and 38. By closely contacting the openings of the recesses 37 and the side surfaces of the tops of the projections 38, the gap formed between the partition wall 13 and the heat transfer plate 17 is divided to form the wall surface of the side plate 25 and the recesses 37. It is configured to be defined by the contact surface 17a of the heat transfer plate 17 not included and only the side surface of the convex portion 38, and the second heat medium is provided only in the second temperature control passage 55a. It is supplied from the tone control system. Since FIG. 7 is a cross-sectional view in a direction orthogonal to the inflow direction of the second heat medium, the first temperature adjustment passage 22 and the inflow port
23 and outlet 24 are not shown.

In the present embodiment, in addition to the effects of the above-mentioned embodiment, the second temperature control passage 55a to which the second heat medium is supplied has the side plate.
25 and the contact surface 17a of the heat transfer plate 17 not including the recess 37
And only the side surface of the convex portion 38, the heat transfer plate 17 contacting the second heat medium to be supplied is limited to a part of the contact surface 17a excluding the concave portion 37. Second transmitted to
The heat of the heat medium is reduced, and the efficiency of heat transfer to the partition wall 13 by the second heat medium is improved. Therefore, when supplying the second heat medium to the second temperature adjusting passage 55a, the temperature change (heat change) of the heat transfer plate 17 can be reduced, and the heat of the second heat medium can be efficiently transferred to the partition wall 13. be able to. After that, the temperature control block 16 is brought into contact with the partition wall 13 via the heat transfer plate 17 so that the first
When the first heat medium is supplied to the temperature control passage 22, since the temperature change of the heat transfer plate 17 due to the second heat medium is small, the heat of the first heat medium can be quickly transferred from the temperature control block 16 to the partition wall 13. it can.

Although water, oil, air, or the like can be used as the first and second heat mediums in the above-described embodiment, water or oil is preferable as the first heat medium in terms of thermal efficiency. When the temperature control block is used as a heating mechanism, other heating means (for example, a heater) may be used in place of the first temperature control passage, and when it is used as a cooling mechanism, another cooling means (for example, , Peltier elements, etc.) may be used.

[0046]

According to the invention of claim 1, a heat transfer plate is inserted between the temperature control block and the partition wall, and the partition wall is in a state in which the temperature control block and the partition wall are in close contact with each other via the heat transfer plate. Since the heat is transferred from the first heat medium to the partition wall in the state where the temperature control block is separated from the heat transfer plate,
There is no heat transfer from the second heat medium to the temperature control block, and the temperature control block does not change heat (change in temperature). Therefore, heat can be efficiently transferred from the first and second heat mediums, and the vicinity of the cavity can be rapidly heated or cooled as needed. As a result, it is possible to shorten the molding cycle and provide a temperature control structure of a mold capable of molding a high quality molded product.

According to the second aspect of the present invention, the heat transfer plate and the partition wall are provided with concave and convex portions on the contact surfaces that are in close contact with each other,
Since the contact surfaces including the concave and convex portions are formed so as to be in close contact with each other without a gap, the contact area between the heat transfer plate and the partition wall can be increased, and the first and second heat medium can be heated or cooled efficiently and rapidly. be able to. Therefore, the molding cycle can be further shortened.

According to the third aspect of the invention, a plurality of concave portions are provided on one side and a plurality of convex portions are provided on the other side so as to form grooves parallel to each other on the contact surfaces of the heat transfer plate and the partition wall. Since the second heat medium is smoothly flowed in the second temperature control passage formed between the heat transfer plate and the partition wall, the heat can be evenly transferred to the partition wall in the vicinity of the cavity, thereby improving the quality of the molded product. Can be improved.

According to the fourth aspect of the present invention, the cross-sectional shape of the concave portion formed on one side of the heat transfer plate or the partition wall is formed in a so-called inverted trapezoidal shape which becomes wider as it approaches the other side, and is formed on the other side. Since the cross-sectional shape of the convex portion to be formed is formed into a so-called trapezoidal shape in which the width becomes narrower as it comes closer to one side, when the heat transfer plate is brought close to the partition wall, the edges of the concave portion and the convex portion come into contact with each other. It is possible to improve the reliability without hindering the close contact and damage.

According to the invention of claim 5, the depth of the concave portion and the height of the convex portion are formed larger than the separation distance between the heat transfer plate and the partition wall, and even when the heat transfer plate is separated from the partition wall. Since the top of the convex portion is set in the concave portion, a second temperature control passage is formed between the concave portion and the convex portion, or in addition to that, a concave portion is formed.
A second temperature control passage is also formed between the side surfaces of the convex portion to effectively bring the second heat medium into contact with the contact surface including the concave portion or the convex portion of the partition wall, and to cause turbulence in the flow of the second heat medium. Generate
Heat can be efficiently transferred from the second heat medium to the partition wall. Therefore, the vicinity of the cavity can be heated or cooled more rapidly, and the molding cycle can be further shortened.

Further, even when the heat transfer plate is separated from the partition wall, when the heat transfer plate is brought close to the partition wall with the top of the convex portion intruding into the recess portion, the edges of the concave and convex portions may come into contact with each other. Since it does not exist, it is possible to improve reliability without hindering the contact surface from being intimately contacted or being damaged. Claim 6
According to the invention described above, the gap formed between the heat transfer plate and the partition wall is divided, and the second heat medium is supplied only through the gap formed on the partition wall side as the second temperature control passage. Board and second
The heat transfer from the second heat medium to the heat transfer plate can be reduced by making contact with the heat medium as a part of the contact surface, and the heat transfer at the time of supplying the second heat medium to the second temperature control passage can be reduced. The heat change (temperature change) of the hot plate can be reduced. Therefore, the heat transfer plate can be separated from the partition wall and efficiently heated or cooled by the second heat medium. After that, the temperature control block is brought into close contact with the partition wall via the heat transfer plate to quickly use the first heat medium. It can be cooled or heated. Therefore, the molding cycle can be further shortened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of a first embodiment of a temperature control structure for a mold according to the present invention, FIG. 1A is a state diagram showing the supply of a first heat medium, and FIG. It is a state diagram showing the time of supply of the second heat medium.

FIG. 2 is a partially enlarged cross-sectional view showing a main part thereof, (a)
Is a state diagram showing the time of supplying the first heat medium, and FIG. 9B is a state diagram showing the time of supplying the second heat medium.

FIG. 3 is a perspective view showing an essential part of a second embodiment of the mold temperature control structure according to the present invention.

FIG. 4 is a perspective view showing a main part of a third embodiment of the mold temperature control structure according to the present invention.

FIG. 5 is a cross-sectional view showing an overall configuration of another aspect,
(A) is a state diagram showing the supply of the first heat medium, (b)
[Fig. 6] is a state diagram showing the time of supplying the second heat medium.

FIG. 6 is a perspective view showing an essential part of a fourth embodiment of the temperature control structure for a mold according to the present invention.

FIG. 7 is a cross-sectional view showing the overall structure of a fifth embodiment of the mold temperature control structure according to the present invention, FIG. 7 (a) is a state diagram showing the supply of the first heat medium, and FIG. It is a state diagram showing the time of supply of the second heat medium.

[Explanation of symbols]

 11, 12 Mold 13 Partition walls 13a, 16a, 17a, 17b Contact surface 14 Cavity 15 Temperature control chamber 15a, 55a Second temperature control passage 16 Temperature control block 17 Heat transfer plate 22 Second temperature control passage 27, 37, 47 Recess 28, 38, 48 Convex

Claims (6)

[Claims] 1. A temperature control chamber provided inside a mold adjacent to a cavity with a partition wall of the mold sandwiched between the temperature control chamber and the temperature control chamber.
A temperature control structure for a mold, comprising: a temperature control block provided so as to be close to and separable from a partition wall; and a first temperature control passage provided in the temperature control block and supplied with a first heat medium, Inserted between the partition wall and the temperature control block in the temperature control chamber,
A heat transfer plate that slides in the temperature control chamber in the same direction as the temperature control block moves is provided, and when the temperature control block approaches the partition wall, the temperature control block and the partition wall contact and closely contact via the heat transfer plate. When the temperature control block is separated from the partition wall, the heat transfer plate is separated from the temperature control block and the partition wall, and a gap formed between the heat transfer plate and the partition wall in the temperature control chamber is used as a second temperature control passage. (2) A temperature control structure for a mold, characterized in that a heat medium is supplied. 2. A concave portion is provided on one side of a contact surface of a heat transfer plate or a partition wall, and a convex portion is provided on the other side of the contact surface so that the contact surfaces including the concave portion and the convex portion are closely contacted with each other without a gap. The mold temperature control structure according to claim 1, which is formed. 3. The plurality of recesses are formed so as to extend parallel to a predetermined direction, and the plurality of projections are formed so as to extend parallel to the same direction as the recesses. The mold temperature control structure according to 2. 4. The recesses are formed so that side surfaces facing each other are closer to each other on the bottom side, and side surfaces facing each other on the projection are formed to be closer to each other on the top side. Mold temperature control structure. 5. The mold temperature control structure according to claim 2, wherein the depth of the concave portion and the height of the convex portion are formed to be larger than the distance between the temperature control block and the partition wall. 6. The opening of the recess and the side surface of the top of the projection are formed so as to come into close contact with each other when the heat transfer plate is separated from the partition wall to form a gap formed between the heat transfer plate and the partition wall. The temperature control structure for a mold according to claim 5, wherein the second heat medium is divided and only the gap formed on the partition wall side is used as the second temperature control passage.