JP2011224906A - Cooling liquid passage structure of mold and mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a mold which allows elongation of a passage for a cooling liquid and suitable modification of regulation of the flow rate of cooling water and does not cause complication of the flow rate design.SOLUTION: In the cooling structure of the mold for cooling of a molten resin, the passage 11 for the cooling liquid includes: an inside hole 14 formed within the mold and a pair of pipe-like members 21 arranged in the clearance between the outer peripheral surface of the pipe body 21c; and the inner peripheral surface of the inside hole. In the pipe-like members 21, an inner peripheral passage 11b for cooling water is arranged on the side of the inner periphery of the pipe body 21c, and an outer peripheral passage 11a communicating with the inner peripheral passage 11b is formed between the inner peripheral surface of the inside hole 14 and the outer peripheral surface of the pipe body 21c so that cooling water flows from the outer peripheral passage 11a to the inner peripheral passage 11b of the pipe body 21c.

Description

  The present invention relates to a cooling fluid channel structure of a molding die that can efficiently cool the molding die with a cooling liquid, and more particularly to a cooling fluid channel structure of a preform molding die of a resin container.

For example, a preform as a preform of a polyethylene terephthalate container (PET bottle) is formed by an injection molding machine, a compression molding machine, or the like. In such a preform, a mouth and neck (nozzle) portion which is a portion serving as a beverage inlet of the container body is formed at the upper portion, and an annular flange projecting radially outward of the preform is formed at the lower portion of the mouth and neck portion. Is formed, and a body portion is formed at a lower portion of the annular flange, and the body portion is stretched by blow molding. A part forming the neck portion of the preform uses a split mold called a neck half, a neck ring half, a neck ring mold, a slide insert mold, or the like.
Preforms are hot during molding, and if the cooling efficiency of the split mold is poor, when the split mold is released at the completion of molding, the neck and neck are not sufficiently cooled and solidified, causing deformation and whitening. There is. As a countermeasure against this, a flow path of a cooling liquid is formed inside the split mold, and the mouth and neck are usually cooled by flowing cooling water as the cooling liquid.

In Patent Document 1 below, a split mold is divided into inner and outer portions in the radial direction and formed by inner layer blocks and outer layer blocks, and grooves serving as cooling water flow paths are formed on the joint surfaces of the inner layer blocks and outer layer blocks. ing. Then, a cooling water supply path is communicated from the outer surface on the outer layer block side to one end of the groove, and a cooling water drainage path is communicated to the other end of the groove to form a cooling water flow path in each split mold. .
In the following Patent Document 2, through holes (channel segments) that serve as cooling water flow paths are formed in a split mold, and a lid member that is a closing member and a lid member are formed in each opening at both ends of the through hole. And a plug provided with a partition plate to be inserted into the flow path. A cooling water supply channel and a drain channel are formed in the cooling water channel. The flow path of the cooling liquid can be lengthened by diverting the flow path of the cooling water of the split mold from the front surface to the back surface of one partition plate and then from the back surface to the front surface of the partition plate.

JP 2007-326241 A JP 2008-542066 A

However, according to Patent Document 1, there is an advantage that different materials can be used for the inner layer material and the outer layer material. However, the structure is composed of two block members, and the configuration such as assembly accuracy is complicated and expensive. In addition, it is difficult to increase the length of the flow path of the cooling liquid, and there are other disadvantages such that the flow path of the cooling liquid cannot be appropriately changed.
According to Patent Document 2, there is an advantage that the cooling water is lengthened by flowing it on the front side and the back side of the partition plate. This patent document 2 discloses an example in which the opening of the hole is closed by brazing or a screw when closing the opening of the plug by the lid member of the plug. However, when the lid member is fixed by brazing, the lid member is replaced. This makes it difficult to change the flow path cross-sectional area of the coolant as appropriate. Further, when the lid member is screwed with a screw, there is a drawback that the mounting angle of the partition plate cannot be fixed so as to reach a specified angle, or the mounting angles of the pair of partition plates do not match. In such a case, there is a possibility that the cooling performance desired by the mold cannot be exhibited sufficiently.
The present invention has been made in view of such circumstances, and the flow path of the cooling water can be easily lengthened, and the flow path cross-sectional area of the cooling liquid can be appropriately changed or the flow path cross-sectional area can be designed. Another object of the present invention is to provide a coolant flow path structure for a molding die that does not become complicated.

In order to achieve the above object, a cooling flow path structure for a molding die of the present invention is a flow path structure for passing a cooling liquid through a molding die, and includes an inner hole provided in the mold and the An outer peripheral flow formed between the inner peripheral flow path on the inner peripheral surface side of the pipe main body and the inner peripheral surface of the inner hole and the outer peripheral surface of the pipe main body formed by the pipe main body inserted into the inner hole. Two double holes made of a path are provided, and the inner peripheral flow path and the outer peripheral flow path are communicated on the front end side, and the outer peripheral flow path is blocked by a closing portion so as not to communicate on the rear end side, The inner peripheral flow paths of the two double holes are connected to each other by a communication path on the rear end side, and an inner hole flow path that allows liquid to pass through the vicinity of the closed portion of the outer peripheral flow path and the outside of the mold. It was set up.
In order to achieve the above object, the cooling fluid flow path structure of the molding die of the present invention includes two inner holes formed so as to cross toward the inside of the molding die, Two pipe-shaped members each having a hollow pipe main body and a hollow mounting portion, which are attached by the mounting portion, two lid members for closing the inner hole opening end, and 2 reaching the inner hole from the outside of the mold. And the pipe-like member seals the outer periphery of the mounting portion and the inner periphery of the inner hole mounting portion with the mounting portion, The inner hole fluid passage is disposed on the inner side of the communication path of the inner hole, and the vicinity of the mounting portion communicates with the outside of the mold, and the communication path and the tip of the inner hole are connected to the pipe-shaped member. The inner circumferential flow path comprising the holes of the pipe-shaped member, the inner circumferential surface of the inner hole, and the path. It includes a peripheral channels comprising a peripheral surface of the flop body.
The cooling liquid flow path structure of the molding die passes from one of the inner hole liquid passages to one of the outer peripheral flow paths, and hereinafter, the inner peripheral flow path on the one outer peripheral flow path side, the other inner peripheral flow path, and the other outer peripheral flow path. The cooling liquid can be configured to flow in the order of the passage and the other inner hole passage.
In the coolant flow path structure of the molding die, it is preferable that the pipe body is cylindrical and the shape of the inner peripheral surface of the inner hole where the pipe body is disposed has a circular cross section.
A mounting portion of the pipe-shaped member of the cooling fluid flow path structure of the molding die is formed with a male screw, and the male screw is screwed onto a female screw formed in the mounting portion of the inner hole, and the male screw is attached. It is preferable that a flow hole is formed in the head portion of the head so as to allow the coolant to flow and to lock the attachment / detachment device for rotating the male screw when the pipe-shaped member is attached and detached.
The molding die having the cooling fluid flow path structure of the molding die is a molding die for forming a preform of a resin container, and the cooling fluid passage structure substantially covers the mouth and neck of the preform. It can be provided in a split mold to be molded.
The cooling fluid channel structure of each of the molding dies according to the present invention can be applied to a molding die having a cooling fluid channel structure.

The cooling liquid flow path structure of the molding die of the present invention employs a dual-structured cooling liquid flow path comprising an inner peripheral flow path passing through the inner peripheral side of the pipe body and an outer peripheral flow path passing through the outer peripheral side. The flow path of the coolant can be lengthened.
Moreover, it becomes a simple structure by making the intersection location of an inner hole into a communicating path.
Furthermore, it is possible to make the flow path of the cooling liquid longer by configuring the cooling liquid to sequentially flow through the formed flow path of the cooling liquid.
Furthermore, since the pipe body is cylindrical and the inner peripheral surface of the inner hole is also cylindrical at that location, it is easy to design the flow path cross-sectional area of the coolant at the location where this double structure is formed.
In addition, by making the pipe member detachable from the mounting portion of the molding die by the attachment portion, the cooling capacity by the coolant can be changed as appropriate by replacing the pipe member.

It is sectional drawing in the mold clamping state of a preform mold. FIG. 2 is a perspective view when the insert slide mold shown in FIG. 1 is placed upside down (viewed from the cavity mold side in FIG. 1). It is sectional drawing which cut | disconnected the insert slide metal mold | die shown in FIG. 2 to the horizontal direction. It is the top view which looked at the flow path of the cooling fluid in one division mold of the insert slide mold shown in FIG. 2 from upper direction. It is a pipe-shaped member arrange | positioned in the cooling path of an insert slide metal mold | die, A is a perspective view, B is a side view, C is sectional drawing. It is the bottom view which looked at the insert slide metal mold shown in Drawing 2 from the lower part (the slide opposite side of Drawing 1). It is sectional drawing and the side view of the left half which show another form of a slide insert metal mold | die.

A preform mold will be described as an embodiment of the present invention.
FIG. 1 is a cross-sectional view showing a preform mold for injection molding as an example of a preform mold, and the mold is closed.
The preform mold 33 includes a cavity mold 34 as a female mold, a core mold 35 as a male mold, and a slide insert mold 36 as a split mold (as described above, a neck half, a neck ring half, a neck It is also called a ring mold.
In the case of the injection mold for injection molding as in the present embodiment, the mold is usually used with its vertical direction in FIG.

Next, the cooling structure of the slide insert mold 36 will be described.
FIG. 2 is a perspective view when the slide insert mold 36 of FIG. 1 is placed upside down. In the following description, the positional relationship such as up and down of the slide insert mold 36 will be described according to the direction of FIG.
The slide insert mold 36 is a plane-symmetrical semicircular ring divided into two parts on the left and right sides, and both are integrated into a ring shape. The slide insert mold 36 is formed with a nozzle forming hole 36a penetrating the center up and down in a state where the divided mold is assembled. The nozzle forming hole 36a is formed on the outer peripheral surface of the nozzle portion of the preform and on the upper side of the nozzle main body portion. Forming a part, and forming a male thread and a flange part.

With reference to FIG. 3 and FIG. 4, cooling liquid, preferably cooling water flow paths 11, 11 are formed in each of the divided molds 36 </ b> A, 36 </ b> B constituting the slide insert mold 36. . Since the flow paths 11 and 11 of the split molds 36A and 36B have the same structure (point symmetry), the coolant flow path structure of one split mold 36A will be mainly described. The description will be given using as appropriate.
With reference to FIGS. 3 and 4, the divided mold 36 </ b> A is provided with a structural hole 12 for facilitating the formation of a hole with an oblique flow path for the coolant. Behind the structure hole 12, a first inner hole 14 formed in an oblique linear direction with respect to the outer side surface of the split mold 36A (in this embodiment, as a more preferable example, an inclination angle of 45 degrees with respect to the side surface) Similarly, a second inner hole 15 formed in an oblique linear direction with respect to the outer surface of the split mold 36A (in the present embodiment, a tilt angle of 135 degrees with respect to the side surface as a more preferable example) is formed. The inner hole 14 and the second inner hole 15 are formed so as to intersect with each other (in the present embodiment, as a more preferable example, orthogonal). Note that the inclination angle with respect to the outer surface and the crossing angle of the inner holes 14 and 15 may be set as appropriate, and the structural hole 12 may be omitted.

The first inner hole 14 includes a plug hole 14a, a communication path 17, a mounting portion 18a, and a cooling chamber 19a in order from the opening side, and the second inner hole 15 has a plug hole 15a and a communication path in order from the opening side. 17, the mounting part 18b, and the cooling chamber 19b. The communication path 17 is shared by the intersection of the first inner hole 14 and the second inner hole 15. In the present embodiment, the inner holes 14 and 15 are each formed by a hole having a step whose axial centers coincide with each other, but may be a straight pipe having no step. In addition, it is preferable that the inner holes 14 and 15 are cylindrical and have a circular cross section, because the cross-sectional area of the flow path can be easily designed.
Among these, the plug holes 14 a and 15 a are fitted with a lid member 13 for closing the cooling water flow path 11. In FIG. 3, the split mold 36 </ b> A shown on the left side in the drawing has the lid members 13, 13 attached to the plug holes 14 a, 15 a, but the split mold 36 </ b> B shown on the right side is for structural explanation. A state in which the lid member 13 is not attached is shown (when the lid members 13 and 13 are attached in the same manner as the split mold 36A). In this embodiment, the lid members 13 and 13 are fixed to the female threads 16a and 16b of the plug holes 14a and 15a by rotation by screws (preferably taper screws for piping plugs), and the first inner hole 14 and the second inner hole 14 are fixed. The opening side of the hole 15 is closed. A hexagonal hole 13a is formed in the head of the lid member 13 as a wrench hole for rotating and removing the lid member 13 and can be attached and detached with a hexagon wrench.

The distal end side of the first inner hole 14 and the distal end side of the second inner hole 15 are arranged so as to straddle the nozzle forming hole 36a that forms the mouth and neck portion of the preform, and the distal end portion of the inner hole is the split mold 36A. It reaches close to the dividing surface (the end surface where the dividing mold 36A abuts against the other dividing mold 36B at the time of molding) and is closed in a bag path shape.
An upstream pipe-shaped member 21 is disposed in the mounting portion 18a and the cooling chamber 19a of the first inner hole 14, and a pipe-shaped member 22 is also disposed in the mounting portion 18b and the cooling chamber 19b of the second inner hole 15. However, in order to reduce the number of types of parts, it is preferable to form the inner holes 14 and 15 so that the pipe-like members 21 and 22 can have the same form.

  As shown in FIGS. 5A to 5C, the pipe-shaped members 21 and 22 are configured by attachment portions 21a and 22a, inner plugs 21b and 22b, and pipe main bodies 21c and 22c. It is preferable that the pipe body has an annular cylindrical cross section, as in the case of the inner holes 14 and 15 described above, the flow path cross-sectional area can be easily designed. Male screws 21d and 22d are formed on the mounting portions 21a and 22a, and the male screws 21d and 22d are fastened by being screwed onto female screws formed on the mounting portions 18a and 18b. In addition, you may make it block | close between the attachment part 21a and the mounting part 18a, and between the attachment part 22a and the mounting part 18b at the time of screwing. In that case, it is preferable that the internal threads formed on the male threads 21d and 22d and the mounting portions 18a and 18b have a pipe taper screw structure, respectively.

In this embodiment, the inner plugs 21b and 22b of the pipe-shaped members 21 and 22 serve as an assembly guide so that the pipe main bodies 21c and 22c are assembled and arranged at predetermined positions (preferably in the center) of the inner holes 14 and 15. ing. In addition, you may play the role which closes between the inner stoppers 21b and 22b and the inner holes 14 and 15 (in that case, it is preferable to interpose a sealing member, such as an O-ring). When these roles are not performed, the inner plugs 21b and 22b can be omitted.
The outer peripheral surfaces of the hollow cylindrical pipe bodies 21c and 22c projecting in the depth direction of the inner holes 14 and 15 from the inner plugs 21b and 22b with the pipe-shaped members 21 and 22 attached to the inner holes 14 and 15 are preferable. Are arranged at an interval (in the radial direction of the inner hole) with respect to the inner peripheral surfaces of the inner holes 14 and 15. The distal ends of the pipe bodies 21c and 22c are opened at the deepest part of the inner holes 14 and 15, and communicate with the inner holes. Thus, in each of the pipe main bodies 21c and 22c, the inner peripheral side and the outer peripheral side of the pipe main bodies 21c and 22c communicate with each other through the tip opening to form a coolant flow path.
The above-described inner plugs 21b, 22b and the attachment portions 21a, 22a are formed with holes 21g, 22g for allowing the pipe main bodies 21c, 22c and the communication passage 17 to communicate with each other to allow cooling water to flow therethrough. Flow holes 21f and 22f are formed on the top surface of 22a. The circulation holes 21f and 22f can be used as attachment / detachment device locking grooves (preferably hexagonal holes) for locking attachment / detachment devices (preferably hexagonal wrench) for rotating and removing the pipe-like members 21 and 22. Preferably formed. Further, the depths of the flow holes 21f and 22f that also serve as attachment / detachment device locking grooves can be changed as appropriate, and may be up to the middle of the attachment portions 21a and 22a, or may reach the inner plugs 21b and 22b.

Returning to FIGS. 3 and 4, the cooling chamber 19a has an outer peripheral flow path 11a formed between the inner peripheral surface of the first inner hole 14 and the outer peripheral surface of the pipe main body 21c, and the inner periphery of the pipe main body 21c. An inner circumferential flow path 11b is formed on the side, and an inner circumferential flow path 11c is formed on the inner circumferential side of the pipe body 22c in the cooling chamber 19b, and an outer circumferential flow is formed between the inner circumferential surface of the second inner hole 15 and the pipe body 22c. A path 11d is formed.
The inner hole communicates with the outside of the split mold 36A through an inner hole liquid passage. As an inner hole liquid passage, a cooling water supply passage is provided on the inner plug 21b side of the cooling chamber 19a of the first inner hole 14. 24 is formed, and a cooling water drainage channel 25 is formed on the side of the inner plug 22b of the cooling chamber 19b of the second inner hole 15. As shown in FIG. 6, a water supply port 24 a that communicates with the water supply channel 24 and a water discharge port 25 a that communicates with the drainage channel 25 are formed on the bottom surface of the split mold 36 </ b> A. The water supply port 24a is attached with a slide insert mold 36A, and supplies an on-off valve and cooling water (not shown) via an internal flow path 39a (see FIG. 1) of a slide pair (also referred to as a slide mechanism) 39 that contacts and separates. Auxiliary equipment such as a pump for measuring the temperature of the cooling water, a thermometer for measuring the temperature of the cooling water, a flow meter, a heat exchanger, and a water storage tank for storing the cooling water are connected, and the drain port 25a is a slide pair 39 for mounting the slide insert mold 36A. The internal flow path 39b (see FIG. 1) is connected to auxiliary equipment such as a water storage tank. It should be noted that the water supply passage 24 and the drainage passage 25 are provided so that the water supply port 24a and the drainage port 25a are located on the side surface excluding the dividing surface of the split mold 36A or on the upper surface side in FIG. The port 24a and the drain port 25a may be directly connected to auxiliary equipment.
The procedure for attaching the pipe-shaped member to the divided molds 36A, 36B is as follows. First, as shown in the divided mold 36B of FIG. Are attached one by one, and then the first inner hole 14 and the second inner hole 15 are closed by the lid members 13 and 13 as shown in the split mold 36A of FIG.

In the present embodiment, as described above, the cooling water flow paths 11 and 11 through which the cooling water flows are formed in the split molds 36A and 36B of the insert slide mold 36.
Referring to FIGS. 3 and 4, the one split mold 36 </ b> A will be described. The cooling water is transferred from the internal flow path 39 a (see FIG. 1) of the slide pair 39 to the cooling water flow path 11 by a pumping means (not shown). Supplied. Specifically, the cooling water is supplied from the water supply port 24a on the bottom surface of the divided molds 36A and 36B to the water supply passage 24 and supplied to the outer peripheral flow passage 11a of the first cooling chamber 19a. In the 1st cooling chamber 19a, since the front-end | tip opening of the pipe main body 21c is connecting with the outer periphery flow path 11a, a cooling water flows in into the inner peripheral flow path 11b of the pipe main body 21c. Then, it passes through the hole 21 g and the communication hole 21 f and flows into the communication path 17. The communication path 17 is a place where the first inner hole 14 and the second inner hole 15 intersect, and the cooling water passes from the communication path 17 through the circulation hole 22f and the hole 22g, and passes through the inner peripheral flow path of the pipe body 22c. 11c. Since the tip opening of the pipe body 22c communicates with the outer peripheral flow path 11d, the cooling water is supplied to the outer peripheral flow path 11d. Then, the cooling water is drained from the outer peripheral channel 11d through the drainage channel 25 to the inner channel 39b (see FIG. 1) of the slide pair 39 from the drainage port 25a, and is preferably collected again in a water storage tank or the like and passed through the heat exchanger. Used again as cooling water.

  Thus, since the cooling chamber 19a side has a double structure inside and outside the outer peripheral flow path 11a and the inner peripheral flow path 11b, the flow path of the cooling water can be lengthened, and the inner peripheral flow path 11c and the outer peripheral flow path can be increased on the cooling chamber 19b side. Since the inner / outside dual structure of 11d is adopted, the flow path of the cooling water can be lengthened. And since the 1st cooling chamber 19a and the 2nd cooling chamber 19b are arrange | positioned so that the nozzle formation hole 36a may be straddled, the circumference | surroundings of the nozzle formation hole 36a of the division molds 36A and 36B are cooled, and a nozzle The molten resin forming the part can be efficiently cooled.

The preform formed by this divided mold prevents the sink or deformation of the nozzle portion (mouth neck portion) by cooling with the flow path of this preferable cooling water, and becomes a stable product (semi-finished product).
The pipe-shaped members 21 and 22 of the present invention have an annular cross section, and the first inner hole 14 (and the first cooling chamber 19a), the second inner hole 15 (and the second cooling chamber 19b). ) Is a double-circular cross-sectional structure of a circular cross-section space, it is easy to design the flow passage cross-sectional area of the cooling water. In addition, the shape of the cooling path does not change regardless of the rotation angle at which the pipe-like members 21 and 22 are attached. Therefore, variation in cooling for each molding die can be suppressed.
Since the pipe-like members 21 and 22 can be attached and detached by screws, the length, inner diameter, and outer diameter (thickness) of the pipe main bodies 21c and 22c of the pipe-like members 21 and 22 can be changed to appropriately flow the cooling water. It is possible to change the design of the cross-sectional area of the road, the cross-sectional area ratio between the inner peripheral channel and the outer peripheral channel, or the channel shape at the tip of the inner hole. Further, in combination with the screw-type lid member 13, the flow path can be easily and sufficiently cleaned. That is, the lid members 13 and 13 and the pipe-shaped members 21 and 22 are removed and cleaned, and the removed inner holes 14 and 15 and the communication passage 17 are cleaned, and then the pipe-shaped members 21 and 22 and the lid member 13 are again cleaned. , 13 can be disassembled and cleaned.

The present invention has been described in detail based on the embodiments with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and other modifications can be made without departing from the scope of the present invention. Or it can be changed.
For example, the cooling liquid is not limited to cooling water, and various cooling liquids such as cooling oil may be used.
In the above embodiment, the cooling water flow paths 11 and 11 are formed in the split molds 36A and 36B which are half molds of the insert slide mold 36 for forming the nozzle forming hole 36a of the preform. The cooling water flow path of the present invention may be formed in a semi-circular object, an arc-shaped object, a V-shaped object, a U-shaped object molding die, or the like. The molding die is not limited to resin injection molding, and may be applied to a resin compression molding molding die, or may be used for various molding dies such as a press working die.
Moreover, although the example of the cooling fluid flow path structure provided with two double holes, an inner hole, a pipe-shaped member, etc. was shown, the cooling fluid flow path structure which made two sets mentioned in embodiment one set is one. A plurality of sets may be provided in the mold.

Further, in the embodiment, the communication passage 17 is the intersection of the inner holes 14 and 15, but as shown in FIG. 7, pipe internal threads are provided in the holes 21g and 22g of the pipe-like members 21 and 22, and a hose is connected thereto. For this purpose, the inner peripheral flow paths 11b and 11c may be connected to each other by a hose 17a.
The lid member 13 and the pipe-like members 21 and 22 are attached to the inner holes 14 and 15 by screws. However, when the pipe-like members need not be frequently replaced, they may be attached by press-fitting, welding, or the like. .
A sleeve-like member with good heat transfer may be attached to the inner peripheral surfaces of the inner holes 14 and 15 in the cooling chambers 19a and 19b to improve the efficiency of heat exchange.
The cooling water flow path described in the present embodiment is an example. For example, a cooling water supply path and a water supply port that directly reach the communication path 17 are separately formed, and the cooling water is supplied from the communication path 17 to the inner peripheral flow paths 11b and 11c. The cooling water can be discharged from the inner peripheral flow paths 11b and 11c to the outer peripheral flow paths 11a and 11d, and the cooling water can be drained from the water supply path 24 and the drainage path 25, and vice versa.

DESCRIPTION OF SYMBOLS 1 Synthetic resin supply apparatus 11 Flow path of cooling water 11a, 11d Outer peripheral flow path 11b, 11c Inner peripheral flow path 13 Lid member 13a Hexagonal hole 14 First inner hole 14a, 15a Plug hole 15 Second inner hole 19a, 19b Cooling chamber 21, 22 Pipe-shaped member 21a, 22b Mounting portion 21b, 22b Inner plug 21c, 22c Pipe body 21d, 22d Male screw 21f, 22f Flow hole 21g, 22b Hole 31 Compression molding device 33 Compression molding die 34 Cavity die 35 Core die Mold 36 Slide insert mold 36A, 36B Split mold

Claims (7)

A flow path structure for passing a cooling liquid through a molding die,
An inner peripheral flow path on the inner peripheral surface side of the pipe main body, an inner peripheral surface of the inner hole, and a pipe main body formed by an inner hole provided in the mold and a pipe main body inserted into the inner hole. Two double holes consisting of an outer peripheral flow path formed between the outer peripheral surface of
The inner peripheral flow path and the outer peripheral flow path are communicated on the front end side, and the outer peripheral flow path is blocked by a closing portion so as not to communicate on the rear end side,
The inner peripheral flow paths of the two double holes are connected to each other by a communication path on the rear end side,
A cooling liquid flow path structure for a molding die, wherein an inner hole liquid passage for allowing liquid to pass through the vicinity of the closed portion of the outer circumferential flow path and the outside of the mold is provided. Two inner holes formed crossing toward the inside of the molding die;
Two pipe-like members each comprising a hollow pipe body and a hollow attachment portion, which are attached by the attachment portion in the inner hole;
Two lid members for closing the open end of the inner hole;
And two inner hole fluid passages that reach the inner hole from the outside of the mold,
The intersection between the inner holes is a communication path,
The pipe-shaped member seals the outer periphery of the attachment portion and the inner periphery of the inner hole mounting portion by the attachment portion, and is disposed on the back side from the communication path of the inner hole,
The inner hole liquid passage connects the vicinity of the mounting portion and the outside of the mold,
The communication passage and the tip of the inner hole communicate with each other through a hole in the pipe-shaped member;
A cooling liquid flow of a molding die, comprising: an inner peripheral flow path composed of holes of the pipe-shaped member; and an outer peripheral flow path composed of an inner peripheral surface of the inner hole and an outer peripheral surface of the pipe body. Road structure.   One of the inner hole passages is passed through one of the outer passages, and the inner peripheral passage on the one outer passage side, the other inner passage, the other outer passage, and the other inner passage passage are sequentially cooled. The coolant flow path structure of the molding die according to claim 1, wherein the coolant flows.   The said pipe main body is cylindrical shape, The shape of the said internal peripheral surface of the inner hole of the location by which the said pipe main body is arrange | positioned is a circular cross section, The shaping | molding in any one of Claims 1-3 characterized by the above-mentioned. Mold coolant flow path structure.   The mounting portion of the pipe-shaped member is formed with a male screw, and the male screw is screwed onto the female screw formed in the mounting portion of the inner hole for mounting, and coolant can be circulated through the head of the male screw. The metal mold according to any one of claims 1 to 4, wherein a flow hole is formed to lock the attachment / detachment device for rotating the male screw when the pipe-shaped member is attached and detached. Mold coolant flow path structure.   The molding die is a molding die for forming a preform of a resin container, and the cooling fluid passage structure is provided in a split die that substantially molds the neck and neck of the preform. The coolant flow path structure of the molding die according to any one of claims 1 to 5.   A molding die comprising the coolant flow path structure according to claim 1.

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