JP2002200620A - Mold with fluid passage for regulating temperature and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel mold with a fluid passage for regulating temperature by bonding technique applying a pulse power supply sintering method such as a discharge plasma sintering method or the like. SOLUTION: A plurality of blocks 20, 30, 40 and 50 mutually bonded by flat bonding surfaces are provided and a groove for demarcating a fluid passage for allowing a fluid to flow is formed to the bonding surface of at least one of the adjacent blocks. At least one of an inlet port and an outlet port communicating with the groove is formed to at least one block among a plurality of the blocks, and a plurality of the blocks are temporarily bonded by a pulse power supply sintering method and subsequently heat-treated to be perfectly bonded. A hole is formed to the bonded block, and at least one of molding cores 60 and 70 demarcating the cavity of the mold is inserted in the hole in a detachable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold having a temperature control fluid passage and a method of manufacturing the same, and more particularly, to a mold having a passage for flowing a heating fluid or a cooling fluid and a method of manufacturing the same.

[0002] A fluid passage is formed in the body of a molding die for controlling the temperature of a molding die such as a plastic molding die, a rubber molding die, a glass molding die or a die casting die. Flowing a cooling fluid or a heating fluid is conventionally known. In such a known mold and a method of manufacturing the same, a plurality of through-holes 3 are formed in the body 2 of the mold 1 from the outer peripheral surface so as to intersect each other as shown in FIG. Some of the openings on the outer peripheral surface are closed with plugs 4 and the rest are used as inlet ports 5 and outlet ports 6, and a cooling liquid or a heating liquid is caused to flow through the fluid passages defined by the plurality of through holes to form the molding die 1. I try to adjust the temperature. The fluid may be a liquid or a gas.

[Problems to be solved by the invention]

[0003] However, in such a conventional molding die,
Since the fluid passage is composed of a combination of a plurality of straight through holes, the shape of the fluid circuit is limited, and it is extremely difficult to form a fluid circuit of an optimal pattern according to a molded product. In addition, there is a problem that the number of steps in the manufacturing process is increased and the cost is increased. Further, in a conventional mold having a fluid passage, a through hole is formed in the center of the mold, and at least one molding core defining a cavity of the mold is removably inserted into the through hole. In the mold, it is difficult to form a cooling passage on its own.
As shown in FIG. 2, a plurality of through holes 3a connected to each other are formed linearly in a rectangular mold base material 7a defining a cavity Cv into which a molding die is inserted, and a part of the through holes 3a is plugged. 4a
It was closed with a passage. For this reason, it is difficult to precisely control the heating and cooling temperatures by accurately aligning the mold with the shape at a position near the molded article, and it is difficult to perform appropriate temperature control. And there were restrictions.

One problem that the present invention seeks to solve is:
Conventional molding dies can be formed by a joining technique (referred to as a pulse current joining method) that applies pulse current sintering (pulse current pressure sintering) such as spark plasma sintering, spark sintering, and plasma activated sintering. An object of the present invention is to provide a new mold having a fluid path for temperature control and a method for producing the same, which eliminates the disadvantages of the production method. Another problem to be solved by the present invention is to provide a molding die with a temperature control fluid passage, which can design a circuit pattern of a temperature control fluid passage with an arbitrary degree of freedom, and a method of manufacturing the same. is there. Another object to be solved by the present invention is to provide a mold with a temperature control fluid passage capable of forming a circuit of a temperature control fluid passage over a plurality of layers at low cost, and a method of manufacturing the same. Still another object of the present invention is to provide a novel combination of a mold having a fluid passage for temperature control and a mold base material defining a cavity for accommodating such a mold. It is.

[0005]

SUMMARY OF THE INVENTION One aspect of the present invention is directed to a mold having a temperature control fluid passage capable of controlling a temperature by flowing a fluid, comprising a plurality of blocks joined to each other by a flat joining surface. A groove defining a fluid passage for flowing the fluid is formed in at least one joining surface of the blocks to be formed, and an inlet port and an outlet port respectively communicating with the groove are formed in at least one of the plurality of blocks. At least one of the blocks is formed, and the blocks are preliminarily joined by a pulse current joining method, and then heat-treated to complete joining. A hole is formed in the joined block, and a molding die is formed in the hole. At least one molding core defining the cavity is detachably inserted. In one embodiment of the mold, the hole is a through hole and the molding core comprises a plurality of core members cooperating to define the cavity, at least one of the core members being removably inserted into the hole. It may be inserted. Also, in another embodiment, the grooves are formed on both joint surfaces joined to each other, and the grooves formed on each joint surface cooperate to define the passage, or The grooves formed on the two joining surfaces to be joined may be individually defined by the grooves formed on the respective joining surfaces. Further, at least two blocks adjacent to the block are formed in an annular shape, a cylinder is inserted inside the annular block, and both end surfaces of the cylinder are blocks or other members in which the cylinder does not enter the inside. May be joined. Another invention of the present application is a method of manufacturing a mold with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, comprising preparing a plurality of blocks having flat joining surfaces, and adjoining each other when joined. Forming a groove defining the fluid passage in at least one of the joining surfaces of the blocks to be joined, and an inlet port communicating with the groove in at least one of the plurality of blocks. And forming at least one of the exit port and the plurality of blocks are brought into contact with each other at the joining surface and temporarily joined by a pulsed electric current joining method, followed by heat treatment to complete the joining to form a base material, Machining the base material to form a hole for inserting a core member, and inserting at least one core member defining a cavity of a mold in the hole, Which comprise. In one embodiment of the above manufacturing method, the bonding surface may be mirror-finished. In another embodiment, the heat treatment may be performed in a vacuum atmosphere in a temperature range of 55 to 85% of the melting temperature of the material of the block.

Another aspect of the present invention is a mold having a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, comprising a male mold and a female mold which cooperate with each other to define a molding cavity. And at least one of the female molds has a plurality of blocks joined to each other by a flat joining surface, and a joining surface of one of the adjacent blocks has a groove defining the fluid passage and an inlet port communicating with the groove. And an outlet port are formed, and the blocks are preliminarily joined by a pulse current joining method and then heat-treated to complete the joining. Still another invention of the present application is a method of manufacturing a mold having a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, wherein at least one set of blocks having a flat joining surface is provided, and the one set of blocks is provided. Forming a groove defining the fluid passage in a joint surface of at least one block of the block; and forming an inlet port and an outlet port respectively communicating with the groove in at least one of the plurality of blocks. That the set of blocks is brought into contact with each other on the joining surface, and temporarily joined by a pulse current joining method, and then heat-treated to complete the joining to form a base material; and the base material is subjected to machining. Forming at least one of a male mold and a female mold of the molding die. In one embodiment of the above manufacturing method, the bonding surface may be mirror-finished. In another embodiment, the heat treatment may be performed in a vacuum atmosphere in a temperature range of 55 to 85% of the melting temperature of the material of the block.

[0007] Still another aspect of the present invention relates to a combination of a mold having a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, and a mold base material defining an accommodation space for accommodating the mold. The mold comprises a plurality of blocks joined to each other by a flat joining surface, and at least one joining surface of adjacent blocks is formed with a groove defining a fluid passage for flowing the fluid; At least one of an inlet port and an outlet port respectively communicating with the groove is formed in at least one block of the plurality of blocks,
The plurality of blocks are preliminarily joined by a pulse current joining method and then heat-treated to complete the joining, a hole is formed in the joined block, and at least a mold cavity is defined in the hole. It is characterized in that one molding core is detachably inserted and a heat insulating layer is provided between the mold base material and the molding die. In the above-mentioned combination, the heat insulating layer may be at least one of a layer of a heat insulating space and a layer of a heat insulating material. Further, at least two blocks adjacent to the block are formed in an annular shape, a cylinder is inserted inside the annular block, and both end surfaces of the cylinder are blocks or other members in which the cylinder does not enter the inside. May be joined. Still another invention of the present application is a temperature control member that is provided adjacent to a molding material injection port of a molding die and adjusts the temperature of the molding material, wherein a flow path for the molding material communicating with the injection port is provided. A plurality of members are formed and joined to each other, and a temperature control passage surrounding the flow path is formed on a joining surface of at least one of the plurality of members, and at least one of the plurality of members is A port communicating with the temperature control flow path is formed, and the plurality of members are temporarily joined at the joining surface by pulse current joining, and then heat-treated to form a complete joined body.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. First, FIGS. 1 to 6 show an embodiment of a molding die and a method of manufacturing the same according to the present invention as a plastic gear molding die and a method of manufacturing the same. In order to form a fluid passage for flowing a cooling liquid such as water or oil in the mold of this embodiment, a plurality of (four in this embodiment) divided blocks are prepared, and a fluid passage is provided in the block. After forming the blocks, the blocks are joined by a joining method (pulse joining method) applying pulse current sintering method such as spark plasma sintering, discharge sintering, plasma activated sintering method, etc. The plastic gear molding die 10 is formed by integrating the base material 11 and then subjecting the base material to machining or the like, and then attaching a core member. The base material 11 for the mold is a material suitable for the material for the mold,
For example, four blocks 20, 30, 40 and 50 of SUS420J2 (stainless steel) made of a solid cylinder or a disk are provided. One surface (upper surface in FIG. 2) 21 of the lowermost block 20 (in FIG. 1) is machined into a flat surface (preferably a mirror surface), and has an annular shape extending in the circumferential direction about the axis of the block. Grooves 23 are formed. Also, one surface (upper surface in FIG. 2) 31 and 41 of each of the intermediate blocks 30 and 40 is also processed into a flat surface (preferably a mirror surface), and these surfaces are formed in a circumferential direction around the axis of the block. Extending annular grooves 33 and 43
Are formed respectively. Further, the lower surface (in FIG. 2) 52 of the uppermost block (in FIG. 1) 50 and the other surface (the lower surface in FIG. 2) 3 of the intermediate blocks 30 and 40
2 and 42 are also processed into flat surfaces (preferably mirror surfaces). Although the numerical range of the mirror surface is not always clear, here, it refers to a surface processed state having a smoothness of a numerical value of Ra 0.3 μm or less (the smaller the numerical value, the higher the smoothness). These grooves 23, 33 and 43 are formed on the same circumference around the central axis of the block. Such an annular groove may be formed by machining such as lathing or milling, or may be formed by casting.

A pair of positioning holes 26, 36, 46 and 56 are formed in each of the blocks 20, 30, 40 and 50 so as to be separated from each other in the diametrical direction. The locating holes are arranged to be aligned with one another, with each pair of locating holes 36 and 46 being a through hole, respectively.
The positioning hole 26 of the block 20 extends downward from the upper surface 21 to a predetermined depth. The positioning hole 56 of the block 50 extends upward from the lower surface 52 to a predetermined depth. Positioning pins (not shown) are inserted into the positioning holes to position the four blocks. The upper two (in FIG. 5) blocks 40 and 50 have four through holes 4 arranged at equal intervals in the circumferential direction.
7 and 57 are formed to penetrate, respectively. On the upper surface 41 of the block 40, a communication groove 48 for communicating the two through holes 47 of the four through holes 47 separated in the diametrical direction (left-right direction in FIG. 2) and the annular groove 43 is provided. It is formed to extend in the radial direction from 43. The block 30 is formed with a pair of through holes 37 that are separated in the diametric direction (the left and right direction in FIG. 2). Member 3
The upper surface 31 of the block 0 has an opening end on the lower surface 42 side of the through hole 47 separated from the remaining two diametrical directions (vertical direction in FIG. 2) of the four through holes 47 formed in the block 40, A communication groove 38 that communicates with the annular groove 33 formed on the base 31 is formed to extend from the annular groove 33 in the radial direction. The annular groove 2 is formed on the upper surface 21 of the block 20.
A communication groove 28 extending in the radial direction from 3 and communicating with two through holes (two through holes separated in the left-right direction in FIG. 2) 37 opened in the lower surface 32 of the block 30 is formed. The communication grooves 28, 38 and 48 may be formed by milling or may be formed by casting together with the annular grooves. The outer diameter of the blocks 50 and 20 at the upper and lower ends may be made larger than the outer diameter of the outer member, and the dimensions may be adjusted later by machining if necessary.
Also, the surfaces of the members 20 to 50 that are joined to each other need not necessarily be flat, but may be curved surfaces if they have the same curvature. Further, the block does not necessarily need to have a circular planar shape as shown, but may have a polygonal shape or an elliptical shape. Further, the block may be formed in an annular shape so that a later-described through hole can be easily manufactured. Furthermore, in the above embodiment, the annular groove formed in one block is one
However, two or more may be formed concentrically and radially separated so that fluid can flow through the grooves through separate passages.

The pre-machined blocks 20, 30, 40 and 50 as described above are superimposed as shown in FIG. 1 and locating pins (not shown) inserted into locating holes 26, 36, 46 and 56. )). Therefore, in this embodiment, the upper surface 31 of the block 30 and the lower surface 32 of the block 40 are provided on a pair of bonding surfaces where the upper surface 21 of the block 20 and the lower surface 32 of the block 30 are bonded to each other.
The upper surface 41 of the block 40 and the lower surface 52 of the block 50
Are a pair of joining surfaces joined to each other. In this state, as shown in FIG. 7, a pulse current welding apparatus 100 applying a pulse current sintering method such as a discharge plasma sintering method.
Are arranged between the pair of current-carrying electrodes, and the block is joined and joined together by the pulse-current joining apparatus to form the base material 11.

The pulse current bonding apparatus 100 includes, for example, a current bonding section 110 and a heat treatment section 120. The current-carrying joint portion 110 includes a lower current-carrying electrode 113 fixed on the base 111 by being electrically insulated from the base via an insulating member by a known method, and a lower conductive electrode 113 disposed above the base 111 and using a known method for the base. The piston rod 1 is fixed to the fixed hydraulic cylinder 114 and the front end (lower end in the figure) of the piston rod 115 of the hydraulic cylinder 114 via an insulating member by a known method.
15 and an upper conducting electrode 116 which is fixed electrically insulated. The upper portion, the lower portion, and the material to be joined may be covered with a vacuum chamber (not shown) by a known method, or may be provided with a vacuum exhaust device. The fluid pressure cylinder functions as a pressurizing device that presses the material to be joined. As the pressurizing device, the upper energizing electrode may be moved up and down by an electric motor and a screw mechanism instead of the fluid pressure cylinder, so that the pressing force can be feedback-controlled. The upper and lower conducting electrodes are electrically connected to the power supply 117. The power supply device can supply a DC pulse current. The power supply device 117 has a built-in switch mechanism (not shown) for electrically connecting and disconnecting the power supply and the conducting electrode. The power that the power supply can supply is a voltage of 100 V or less and a current of
For example, the power is a large current of 2000 to 5000 A. In the above example, the lower current-carrying electrode is fixed and the upper current-carrying electrode is moved. However, the reverse or both may be moved. The heat treatment section 120 may be a vacuum heat treatment furnace having a known structure. Further, the current-carrying part 110 and the heat treatment part 120 may be integrated into a movable structure, or they may be separately arranged. In the above embodiment, the upper energizing electrode is fixed by, for example, a plurality of columns (not shown), and a pressurizing device such as a fluid pressure cylinder is arranged on the base 111, and the lower energizing electrode is set by the pressurizing device. You may make it move up and down.

After setting a plurality of blocks 20, 30, 40, and 50 superposed and positioned between a pair of energizing electrodes 113 and 116 of the bonding apparatus 100, a predetermined pressure, for example, by a pressurizing apparatus. When a DC pulse current of a predetermined current is applied at a predetermined voltage between current-carrying electrodes according to the volume, cross-sectional area, material, shape, size, and the like of the object to be bonded in a state of being pressurized at a pressure of 0 to 50 megapascals , The blocks are between the mating surfaces of the pair, ie the upper surface 21 and the lower surface 3
2, between the upper surface 31 and the lower surface 42, and between the upper surface 41 and the lower surface 52. This is because when passing a pulsed direct current, high contact surface portions of the contact resistance is found heated to a high temperature by Joule heating, also, generally by the resistance of the material itself is heated joules. Further, an electric field is generated along the direction of the on-off pulse current flow, and electric field diffusion occurs. The field diffusion effect and mechanical pressure of the thermal diffusion mentioned above can be considered the last and also the orientation of the contribution to the metal crystal structure to a solid phase diffusion bonding. Further, it is known from the results of the joining experiments that the pulse current joining (sintering) method has a higher diffusion rate per unit time and a higher densification rate than the conventional continuous direct current joining (sintering) method. In principle, the amount of diffusion by short-time pulse conduction is small only in the surface layer. As a result, the joining between the adjacent blocks in this state is not yet perfect in terms of the joining strength, but it is considered that the arrangement state of the metal lattice at the joining interface is aligned in a direction in which diffusion is easier. Therefore, this joined state is called temporary joining, and the temporarily joined member is called a temporary joined body. Temporarily joined blocks 20, 30, 4
Next, the temporary bonded body composed of 0 and 50 is subjected to heat treatment in the heat treatment furnace of the heat treatment unit 120. This is called two-stage processing. The heat treatment temperature and time vary depending on the material and size of the member. By performing this two-step heat treatment, a large amount of energy that contributes to diffusion is input, and the solid state diffusion bonding between the bonding surfaces is rapidly performed because of the provisional bonding in which the temporary bonding is performed and the metal crystal orientation at the bonding interface is uniform. And the diffusion amount (depth) is increased to complete the integrated body, and the joined strength of the joined body is equal to the strength of the material of the member. Thus, the production of the base material 11 is completed. The pressing force by the above-mentioned pulse current bonding, the voltage and current of the pulse current, the heat treatment temperature and time, etc. vary depending on the material and size of the block, but SUS420J2 is used as the material of the block, the diameter of the block is 70 mm, and the blocks 20, 30, and When the thickness of 40 and 50 is 10, 13, 13 and 25 mm respectively,
The pressure should be 30MPa, the voltage should be 3 ~ 10V, the current value should be 4,000 ~ 6,000Amp, the vacuum heat treatment temperature and time should be 900 ~ 1200 ℃ and 30 ~ 90 minutes respectively. Preferred to obtain.

The base material 11 for the molding die thus formed is a fluid through which a temperature regulating fluid defined by a plurality of annular grooves 23, 33 and 43 and communication grooves 28, 38 and 48 flows. A passage is formed. Then, the through holes 37, 47 and 57 on the left and right sides in FIG.
If one set (e.g., the right through hole) functions as an inlet port to the fluid passage defined by grooves 23 and 43, the other set (the left through hole) functions as an outlet port ( The flow of the fluid in this case is indicated by ⇒ in FIG. 1). Further, a pair of through holes 47 and 57 (for example, upper through holes) on both upper and lower sides in FIG.
The other set (the lower through-hole) functions as an outlet port if the inlet port to the fluid passage defined by (the fluid flow in this case is indicated by → in FIG. 1). . In addition, since the mirror surface processing is performed in advance between the joining surfaces of each pair, a solid-phase diffusion effect occurs on the front surface to be brought into contact, a dense joining is performed over the front surface, and an O-ring or the like is provided between the joining surfaces. Even if the sealing material is not sandwiched, the fluid does not flow out from the fluid passage through the joint surfaces to the outside. Base material 11
In a later machining step, a through hole 12 is formed at the center (a position radially inside the annular groove and not interfering with the annular groove) as shown in FIG.
Created as 1 '. In this embodiment, the through hole 12 has a circular cross section 13 having a diameter D1 and a diameter D2.
(D2 <D1) a section 14 having a circular cross section and a section 13
And a portion 15 having a large number of irregularities formed in a spline shape on the inner periphery thereof, which is located between the two. Since the unevenness formed on the inner periphery of the portion 15 is a portion forming a plurality of teeth of a plastic gear which is a molded product, it is formed according to the shape and size of the plastic gear.

On the other hand, a core member defining a cavity (a cavity into which a plastic material is poured) required for molding plastic in the through hole is manufactured by another manufacturing process. The core member of this embodiment is composed of two core members 60 and 70 shown in FIGS. One core member 60
A large-diameter portion 63 having an outer diameter that is tightly fitted to a portion of the diameter D1 of the through hole 12 formed in the main body 11 ′, and an annular shape cooperating with the portion 15 of the main body 11 in the through hole 12. A small diameter portion 64 having a diameter d1 that defines the cavity is formed. Also, one surface (FIG. 4)
And the upper surface, which is inside the through hole 12 of the main body) 6
A stepped core hole 65 penetrating from 1 to the other surface 62 is formed. In the center of the surface 61 is a circular recess 6 of diameter d2.
6 are formed. Further, the core member 60 has an axis O-
A plurality of through holes 67 and 68 are formed at positions on the circumference of the radii r1 and r2 from O in the circumferential direction. In these through holes, an extrusion pin 82 for extruding a molded product,
83 is inserted. The other core member 70 is the main body 11
A large-diameter portion 73 having an outer diameter closely fitted into a portion of the diameter D2 of the through hole 12 formed in the through hole 12, and a diameter d1 defining an annular cavity in the through hole 12 in cooperation with the main body 11. A small diameter portion 74 is formed. Also, a molding material injection port 75 is formed in the core member 70 so as to penetrate from one surface (the upper surface in FIG. 5 and the surface inside the through hole 12 of the main body) 71 to the other surface 72. At the center of the surface 71, a circular concave portion 76 having a diameter d2 is formed. The core members 60 and 70 as described above are connected to the main body 1 as shown in FIG.
The mold 10 is inserted into the through hole 12 of 1 ′ together with the shaft 81. Note that the through hole portion 14 may be a tapered hole that extends toward the outside of the main body. In that case, the outer periphery of the portion 73 of the core member 70 is also tapered. If the teeth of the plastic gear are not straight gears but helical gears, the irregularities formed on the portion 15 are of course made in a shape corresponding to the helical gears.

FIGS. 8 to 10 show a molding die 10a of another embodiment and a method of manufacturing the same. In this embodiment, SUS420J2 (two stainless steel square blocks 20a and 30a are provided.) One surface (the upper surface in FIG. 8) of the lower (in FIG. 8) block 20 is the same as in the previous embodiment. 21a is processed into a flat surface (preferably a mirror surface), in which a zigzag groove 23a is formed, and the lower surface (in FIG. 8) 32a of the upper (in FIG. 8) block 30a is also a flat surface (preferably a mirror surface). )
Has been processed. The block 20a is formed with a pair of ports 27a communicating with the end of the groove 23a and penetrating the other surface (the lower surface in FIG. 8). The blocks 20a and 30a thus machined in advance are overlapped with each other and positioned by the same positioning holes (not shown) and the positioning pins inserted in the positioning holes as in the above-described embodiment. Next, the bonding surface (block 2 in this embodiment)
9a and the lower surface 32a) of the block 30a to form a pair of base materials 11a as shown in FIG.

A block 30a of one of the base materials 11a formed as described above is machined to form a protruding portion 12a to form a molded male mold 10a ', and a block 30 of the other base material is formed. Is formed with a concave portion 13a for receiving the protruding portion 12a of the molded male mold 10a ', and an injection port 29a is formed in the block 20a to form the molded female mold 10a ". The molded male mold 10a' and the molded female mold 10a are formed. Are overlapped so that the projection 12a enters the recess 13a, and the molding material is injected from the injection port into the cavity formed therebetween. Various desired patterns such as spin, spiral, diamond cut, and hairline are formed on the inner surface of the circular, irregular, flat or stepped flat cavity, that is, the inner surface of the concave portion 13a, and the outer surface, that is, the surface of the convex portion 12a. May be chopped. In the above embodiment, the case where the fluid passage is formed in both the male and female types has been described. However, when the fluid passage is formed in only one (male or female type), the remaining one is formed. It is not necessary to use a base material in which the above-described block materials are joined. In the above two embodiments, SUS420J2 is used as the material of the block.
(Stainless steel) was used, but other materials such as die steel such as SKD11 and SKD61, or SK
High speed steel such as H51 can be used. Further, the pattern of the fluid passage has a circular shape in the first embodiment, and a zigzag shape in the second embodiment. However, it does not hinder the manufacture of the mold according to the shape of the molded product such as a radial shape or a lattice shape. Various shapes are possible within the range. The coolant flowing through the fluid passage may be liquid or gas. After all the machining is completed and the joining of all the blocks is completed, the sulphinitriding may be performed also for the purpose of rust prevention of the fluid passage.

The molding die 10 formed as described above is inserted into a cavity for mounting a mold base material. In this case, as shown in FIG. In the cavity 201 to be formed, an adiabatic space I is provided between the outer periphery of the two blocks 30d and 40d at the center of the mold 10d and the inner periphery of the cavity.
c is formed. Therefore, the mold 1
As shown in FIG.
The outer diameter of the blocks 20d and 50d at the upper and lower ends is sufficiently large to fit into the cavity (for example, the inner diameter of the outer member and the outer member). Dimensional difference from the outer shape of the inner member is 2
0 to 50 μm). Instead of increasing the outer diameters of the blocks at both ends, heat insulation may be performed by fitting blocks made of a heat insulating material to blocks 20d and 50d having the same outer diameter as the outer diameters of the central blocks 30d and 40d. Also, as shown in FIG. 12, a sleeve 80 is fitted to the outside of the blocks 20e and 50e having a larger outer diameter of the mold 10e and fixed by welding or the like, and the sleeve and the central block 30e,
A vacuum cavity Vc held in a vacuum state (negative pressure state) may be provided between the vacuum cavity Vc and the vacuum cavity Vc, thereby increasing the heat insulating effect. Incidentally, reference numeral 81 denotes a reinforcing rib. Further, as shown in FIG. 13, the blocks 20f, 50f of the molding die 10f.
May be made larger than the outer diameters of the blocks 30f and 40f, and the heat insulating sleeve 85 may be fixed to the outside of the block at the end, and a molding die with a heat insulating sleeve may be inserted. As described above, by forming the heat insulating layer by at least one of the heat insulating space and the heat insulating material between the mold and the mold base material, the temperature control of the mold can be performed more easily and efficiently, and at a high temperature. Resin materials that require molding (for example, 300 ° C
Above).

In FIG. 14, a modification of the base material for a molding die is indicated by 11 g. The base material 11g for a molding die of this modified example includes annular blocks 20g, 30g, 40g, and 50g having the same inner diameters instead of the disk-shaped blocks of the embodiment shown in FIGS. The grooves 23g, 33g, 43 extending on the entire surface in the circumferential direction on one surface as in the above-described embodiment.
g, through holes 37g, 47g extending through the block,
57g and the communication grooves 28g, 38g and 48g are formed to communicate the grooves and the through holes, and to communicate with the grooves. Then, blocks 20g to 50g are overlapped as described above. Further, a cylindrical body 90g is inserted into these blocks. The length of the cylinder should be the same as the thickness of the blocks 20g to 50g, preferably on each block,
The lower surfaces and the inner peripheral surface, the upper and lower ends and the outer peripheral surface of the cylindrical body 90 are polished to mirror surfaces. The outer diameter of the cylindrical body 90g and the inner diameter of the block 20g to 50g are defined as dimensions such that the cylindrical body 90g fits tightly inside the block without any gap (for example, a dimensional difference between the inner diameter of the block and the outer diameter of the cylindrical body). Is determined to be 20 to 50 μm). Although not shown, a positioning hole is formed in the block, and the blocks are positioned with respect to each other by a positioning pin, as in the above embodiment.

On the other hand, an end member 91 formed with a port 911 communicating with a through hole 57g formed in the block 50g.
g and another end member 92g are prepared. The surface of the end member 91g on the block 50g side (upper surface in FIG. 14) and the surface of the end member 92g on the block 20g side (lower surface in FIG. 14) are mirror-polished. 20g of the above stacked blocks
50g and the cylindrical body 90g inserted in the blocks are arranged between the end members 91g and 92g, and they are joined by the pulse current joining method in the same manner as described above to form the base material 11g. In this case, not only between each block,
Between block 20g and end member 92g, block 50g
Between the end member 91g and the end face of the cylindrical body 90g and the end member 91g.
g and 92 g, and between the outer peripheral surface of the cylindrical body and the inner peripheral surface of each block. A through hole as shown by a chain line is formed in the base material thus completed in the same manner as in FIGS. 1 to 6, and a core member of a molding die is inserted. In the above-described embodiment, the cylinder is inserted into the four blocks. However, only the two central blocks are formed into an annular shape, the cylinder is inserted therein, and both end surfaces of the cylinder are joined to the surfaces of the other blocks. You may. Furthermore, an annular groove is formed in the block 30g,
The upper surfaces (in FIG. 14) of 40g and 50g are formed, and the block 20g may be omitted or the block 20g may be used instead of the member 92g. According to the pulse current joining method applied to the present invention, joining between blocks can be performed almost completely. However, if the structure of this embodiment is adopted, the joining surface between blocks is formed of a base material. Since it does not appear on the through hole side, even if a joint failure occurs at the joint surface between the blocks, it is possible to completely eliminate the possibility that the fluid leaked from the fluid passage will flow into the through hole of the base material through the joint failure part Is possible.

FIG. 15 shows a temperature control member 300 suitable for being provided at an injection port for injecting a molding material such as molten plastic into a mold formed as described above. The temperature adjusting member 300 is disposed, for example, at the inlet of an injection port 75 formed in the core member 70 of the molding die 10 shown in FIG. 6, and controls the temperature (heating) of the molding material injected into the molding die. , Cooling). In this embodiment, the temperature adjusting member 300 has two circular members 310 and 320, and one surface 311 of the member 310 has an annular groove 313 extending in the circumferential direction and communicates with the groove to form an outer periphery. Two ports 3 opening to
17 (i.e., an inlet port and an outlet port). The surface 311 of the member 310 and the surface 321 of the member 320 are preferably mirror-finished. The members 310 and 320 are joined to each other by the above-described pulse current joining method. After the joining is completed, a flow path 301 through which the molten molding material flows is formed. The groove 313 and the port 317 form a flow path for a temperature control fluid. By using the temperature adjusting member 300, the temperature of the molding material injected into the mold can be controlled, and molding with the high-temperature molten material can be performed easily and reliably.

FIG. 16 shows an example in which a flow path for a temperature control fluid for controlling the temperature of a molding material such as molten plastic injected into the molding die is provided in the molding die itself. The molding die 10h provided with this flow path is:
6 has a common structure to most of those shown in FIG. 6, the description of the common portion is omitted, and only different portions will be described. One core member 70h of the molding die 10h is composed of two members, an outer portion 71h and an inner portion 72h, and these are joined by the same joining method as described above. In both parts 71h and 72h, a molding material injection port 75h leading to the molding cavity is formed therethrough. An annular groove 73h surrounding the molding material injection port 75h is formed on a surface of the inner portion 72h on the outer portion side. Also, a pair of ports 77h communicating with the annular groove are formed in the outer portion 71h. This port 7
One of 7h may be an inlet port and the other may be an outlet port. The temperature control (heating or cooling) fluid flowing into the annular groove from the inlet port flows through the annular groove and out of the outlet port to heat or cool the core member 70h, thereby heating the molding material flowing through the injection port. Or cool. The annular groove may be provided on the joining surface of the outer member, or may be provided on the joining surface of both members.

[0022]

According to the present invention, the following effects can be obtained. (A) Since the block with the groove that defines the fluid passage on the surface is joined by the joining method (pulse welding method) applying the pulse current sintering method, it is larger than the conventional brazing and welding methods. The joining interface having a large area can be joined uniformly without gaps over the entire area without leakage, and a circuit pattern of a desired fluid passage can be formed in the mold, thereby improving the temperature control efficiency of the mold. As a result, sink, distortion, warpage,
It is possible to produce high quality molded products with high dimensional accuracy without variation. (B) Since a block having a groove defining a fluid passage formed on a surface thereof is joined by a joining method using a pulse current sintering method, a conventional method of providing an O-ring groove and sealing the block with an O-ring is used. This eliminates the need for the circuit pattern of the desired fluid passage, which can be easily formed. The flexibility of the passage can be designed close to the target portion with an increased degree of freedom, so that an efficient cooling and heating structure can be achieved and the production cost can be reduced. (C) Since a plurality of fluid passages can be defined, partial temperature adjustment is possible, and the quality of the molded product can be improved. (D) With the same concept, a fluid passage can be defined inside the convex shape, and more detailed temperature control can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a base material used in an embodiment of a mold having a temperature control passage according to the present invention.

FIG. 2 is an exploded perspective view showing each block of the mold of FIG. 1 in an exploded state, showing a positional relationship of grooves, through holes, communication grooves, and the like formed in each block.

FIG. 3 is a cross-sectional view of a main body of a molding die formed by subjecting the base material of FIG. 1 to machining.

FIG. 4 is a perspective view of one core member inserted into the main body of FIG. 3;

FIG. 5 is a perspective view of the other core member inserted into the main body of FIG. 3; .

FIG. 6 is a sectional view of a molding die.

FIG. 7 is a diagram showing a schematic configuration of a pulse current bonding apparatus.

FIG. 8 is a perspective view showing an exploded state of a block of a molding die according to another embodiment.

9 is a sectional view of a base material formed by joining the blocks of FIG.

FIG. 10 is a cross-sectional view of a molded male mold and a molded female mold obtained by machining the base material of FIG. 9;

FIG. 11 is a diagram illustrating a state in which a molding die is attached to a cavity of a mold base material.

FIG. 12 is a view for explaining another state of attachment of a molding die into a cavity of a mold base material.

FIG. 13 is a view for explaining still another attachment state of a molding die in a cavity of a mold base material.

FIG. 14 is a sectional view of still another embodiment of the molding die of the present invention.

FIG. 15 is a cross-sectional view of a temperature control member for a molding material produced by a joining method applied in the method of manufacturing a molding die of the present invention.

FIG. 16 is a cross-sectional view showing a mold in which a flow path for a temperature control fluid is formed.

FIG. 17 is a view showing an example of a conventional mold having a fluid passage.

FIG. 18 is a view showing an example of a conventional mold base material with a fluid passage.

[Explanation of symbols]

10, 10a Mold 10a 'Male mold 10a "Female mold 11, 11a, 11g Base material 12 Through hole 20, 20a, 30, 30a, 40, 50 block 20g, 30g, 40g, 50g Block 23, 23a, 33, 43 Annular grooves 23g, 33g, 43g Annular grooves 28, 38, 48 Communication grooves 37, 47, 57
Through hole 60, 70 Core member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshito Miyasaka 4750-11 Nakasu Osu, Suwa City, Nagano Prefecture Within Suwa Thermal Industry Co., Ltd. (72) Inventor Fumitake Nishiyama 4750-11 Nakasu Osu, Suwa City, Nagano Prefecture Inside Suwa Thermal Industry Co., Ltd. (72) Inventor Tadamasa Fuchida 4750-11 Nakasu Oaza, Suwa City, Nagano Prefecture Inside Suwa Thermal Industry Co., Ltd. (72) Inventor Tetsuro Tanaka 2104-1, Yonezawa, Chino City, Nagano Prefecture Nissin Koki Co., Ltd. (72) Inventor Masao Tokita 3-20-4 Nishishinbashi, Minato-ku, Tokyo Sumitomo Stone Coal Mining Co., Ltd. 4E093 NA01 NB05 4F202 AH12 CA30 CB01 CD18 CD27 CD30

Claims (16)

[Claims] 1. A molding die with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, comprising: a plurality of blocks joined to each other by a flat joining surface; A groove defining a fluid passage for flowing a fluid is formed, and at least one of an inlet port and an outlet port respectively communicating with the groove is formed in at least one of the plurality of blocks, and the plurality of blocks are formed. Are temporarily bonded by a pulse current bonding method and then heat-treated to complete the bonding, a hole is formed in the bonded block, and at least one molding core defining a cavity of a molding die in the hole. A molding die with a fluid passage for temperature adjustment into which is detachably inserted. 2. The mold according to claim 1, wherein the hole is a through hole, and the molding core comprises a plurality of core members cooperating to define the cavity. A mold in which at least one of the core members is removably inserted into the hole. 3. The mold according to claim 1, wherein the grooves are formed on both joint surfaces joined to each other, and the grooves formed on each joint surface cooperate with each other. A mold defining the passage; 4. The mold according to claim 1, wherein the grooves are formed on both joint surfaces joined to each other, and the grooves formed on each joint surface are separately formed. A mold defining the passage; 5. The molding die with a temperature control fluid passage according to claim 1, wherein at least two blocks adjacent to the block have an annular shape,
A molding die in which a cylindrical body is inserted inside the annular block, and both end surfaces of the cylindrical body are joined to a block or another member in which the cylindrical body does not enter. 6. A method for manufacturing a mold having a temperature control fluid passage capable of controlling a temperature by flowing a fluid, comprising: providing a plurality of blocks having flat joint surfaces; Forming a groove defining the fluid passage in at least one of the joining surfaces of the blocks to be joined; an inlet port and an outlet communicating with the groove in at least one of the plurality of blocks; Forming at least one of the ports, bringing the plurality of blocks into contact with each other at the joining surface, temporarily joining them by a pulse current joining method, and then performing heat treatment to complete joining to form a base material; Machining the material to form a hole for inserting a core member, and inserting at least one core member defining a cavity of a mold into the hole. A method for manufacturing a molding die including: 7. The method for manufacturing a mold having a fluid passage for temperature adjustment according to claim 6, wherein the joining surface is mirror-finished. 8. The method according to claim 6, wherein the heat treatment is performed in a vacuum atmosphere in a temperature range of 55 to 85% of the melting temperature of the material of the block. The method of manufacturing the mold to be performed. 9. A molding die with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, comprising a male die and a female die which cooperate with each other to define a molding cavity, wherein at least one of the male die and the female die is provided. A plurality of blocks are joined to each other by a flat joining surface, and a joining surface of one of adjacent blocks is formed with a groove defining the fluid passage and an inlet port and an outlet port respectively communicating with the groove. A molding die with a fluid path for temperature adjustment in which the plurality of blocks are preliminarily joined by a pulse current joining method and then heat-treated to complete joining. 10. A method for manufacturing a mold having a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, wherein at least one set of blocks having a flat joining surface is provided, and at least one of the blocks is provided. Forming a groove defining the fluid passage in a joint surface of one block; forming an inlet port and an outlet port respectively communicating with the groove in at least one of the plurality of blocks; The set of blocks is brought into contact with each other on the joining surface, temporarily joined by a pulse current joining method, and then heat-treated to complete the joining to form a base material. And forming at least one of a male mold and a female mold. 11. The method according to claim 10, wherein said joining surface is mirror-finished. 12. The method according to claim 10, wherein the heat treatment is performed in a vacuum atmosphere at a melting temperature of 55 of the material of the block.
A mold in a temperature range of from about 85% to about 85%. 13. A combination of a molding die with a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, and a mold base material defining an accommodation space for accommodating the molding die, wherein the molding die comprises: A plurality of blocks joined to each other by a flat joining surface, at least one joining surface of an adjacent block is formed with a groove defining a fluid passage for flowing the fluid, and at least one of the plurality of blocks; At least one of an inlet port and an outlet port respectively communicating with the groove is formed in one block, and the blocks are preliminarily joined by a pulse current joining method and then heat-treated to complete joining. A hole is formed in the formed block, and at least one molding core defining a cavity of a molding die is removably inserted into the hole, and the mold base material and the molding are formed. The combination of the temperature adjusting fluid passage with the mold and the mold base material heat insulating layer is provided, it is characterized by between. 14. The combination according to claim 13, wherein the heat insulating layer is at least one of a layer of a heat insulating space and a layer of a heat insulating material. 15. The combination according to claim 13, wherein at least two blocks adjacent to the block are formed in an annular shape, and a cylindrical body is inserted inside the annular block, and both ends of the cylindrical body. A combination having a surface joined to a block or other member that does not have a cylinder inside. 16. A temperature control member provided adjacent to a molding material injection port of a molding die and configured to control the temperature of the molding material, wherein a flow path for the molding material communicating with the injection port is formed. Comprising a plurality of members joined together,
A temperature control passage surrounding the flow path is formed on a joining surface of at least one of the plurality of members, and a port communicating with the temperature control flow path is formed on at least one of the plurality of members, A temperature control member in which a plurality of members are temporarily joined at the joining surface by pulse current joining, and then heat-treated to form a complete joined body.