JPH0620020U - Mold core cooling device - Google Patents

Abstract

(57) [Abstract] [Purpose] A mold core that is easy to mold and mount, and can accurately spot cool a desired cooling site without being restricted by the water channel drilling site due to interference with pins. I propose a cooling device. [Structure] A cooling hole 7 formed as a blind hole at a desired cooling portion of a core 2 incorporated in a template 1, and an open front end portion is removably inserted into the cooling hole 7, and a base end portion 8A is provided. A cooling unit 8 formed of an inner and outer double pipe of a bottomed outer pipe 9 and an inner pipe 10, each having a cooling water outflow port 11 and a cooling water inflow port 11, 12, respectively.
It consists of and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling device for cooling a mold core such as a core block or a cavity block incorporated in a mold plate.

[0002]

[Prior art]

 Many of the injection molding dies employ a nesting method in which a core such as a separate core block or cavity block is fitted and fixed in a mold plate. When a cooling water channel is provided in a mold core of this type, conventionally, a straight channel that penetrates through the mold plate and the core is provided. For example, in the structure shown in FIGS. 4 and 5, a pair of parallel water channels 3 and 3 is provided in the core 2, and the channels 3 are connected to the water channels 3 and 3 in a straight line on both sides of the template 1. A set of parallel through holes 4 and 4 is drilled, and long hose nipples 5 and 5 are connected to the channels 3 and 3 of the core 2 through the through holes 4 and 4, and the ends on the front side of the template are connected. While connecting a water injection pipe and a drain pipe (not shown), the ends on the back side of the template are connected to each other by a U-shaped pipe 6, and in the template 1 and the core 2 in the path indicated by the arrow in FIG. A circulation channel for circulating cooling water is provided.

In another example, a water channel formed in a template and a channel formed in a core are connected via an O-ring to form a straight circulation channel for cooling both the template and the core. It is also established.

[0004]

[Problems to be solved by the device]

 However, according to the conventional line cooling method, the straight water channel interferes with the ejector pin, core pin, etc. inserted in the mold core according to the molding conditions, and the water channel can be drilled at a desired cooling site. In many cases, it becomes impossible to perform effective cooling on the mold core. As a measure to avoid such a restriction, it is of course possible to provide a bent channel in the template and the core, but in that case, the machining of the channel becomes complicated and the cost is very high. There is.

The present invention is a mold core cooling device in which a hole for a water channel is restricted by pins, which is easy to process and attach to the mold, and is not restricted by interference with pins. We are newly proposing a device that enables spot cooling of a desired cooling area without receiving it.

[0006]

[Means for Solving the Problems]

 In the mold core cooling device according to the present invention, a cooling hole is formed by a blind hole at a desired cooling portion of the core to be incorporated in the mold plate, and an open tip is detachably attached to the cooling hole. And a cooling unit formed of an inner and outer double pipe, each of which has a cooling water outflow / outlet at its base end.

[0007]

[Action]

 That is, in this cooling device, a blind cooling hole is formed in a desired cooling portion of the core to be incorporated in the template from a direction that does not interfere with the pins, and the insertion hole provided in the template or the like is previously passed through this cooling hole. Insert and attach the open end of the prepared cooling unit. When cooling water is circulated through the inlet and outlet of the base end in the cooling unit formed by the inner and outer double tubes in this inserted state, the area around the cooling hole of the core on which the cooling water acts becomes effective. It will be spot cooled.

[0008]

【Example】

 FIG. 1 illustrates one embodiment of the present invention described above. In the figure, 1 denotes a mold plate, 2 denotes a core (nesting) to be incorporated in a mold plate recess, and a core or cavity (not shown) is formed on the surface of the core 2.

As shown in FIG. 2, the core 2 is provided with a blind hole from a direction that does not interfere with the ejector pin P1 or the core pin P2 provided in association with the shape of the core or the cavity C, as illustrated in FIG. Is provided with a vertical cooling hole 7, and a separate cooling unit 8 prepared in advance is detachably inserted into the cooling hole 7.

The cooling unit 8 is formed of an inner-outer double pipe in which the inner pipe 10 is concentrically implanted in the bottom of the bottomed outer pipe 9 at the base end side, and the inner pipe 10 is slightly separated from the outer pipe 9 on the tip side. On the other hand, at the base end portion 8A, cooling water outflow inlets 11 and 12 are formed on the side walls of the outer pipe 9 and the inner pipe 10, respectively, and are formed at the projecting open ends. Conduits 13, 14 are connected to pass cooling water, respectively.

In this cooling unit 8, a cooling hole 7 formed in the core 2 is inserted through an insertion hole 15 which is a stupid hole previously formed in the template 1 or the like corresponding to the unit mounting position. The open front end is inserted, and the male screw 9a provided on the outer periphery of the outer pipe 9 is screwed into the female screw 7a provided on the inner periphery of the inlet of the cooling hole 7 so as to be detachably attached. . The screwing operation into the cooling hole 7 of the cooling unit 8 is carried out by applying a screwdriver such as a spanner to the hexagon head 16 provided on the outer periphery of the unit base end portion 8A.

Thus, after inserting the cooling unit 8 into the cooling hole 7 of the core 2, the conduits 13 and 14 of the unit base end portion 8A exposed downward from the insertion hole 15 of the template 1 and the like, When a water supply hose 18 or the like is connected via each nipple 17, and the cooling water is circulated through the double water passage inside and outside the cooling unit 8 through the cooling hole 7 as shown by the arrow in the figure, the cooling water acts. The area around the cooling holes of the core 2 is effectively spot-cooled. The water injection hoses 18 and the like connected to the conduits 13 and 14 of the cooling unit 8 are extended to the side of the mold from the operation space of the ejector plate provided in the lower part of the mold plate of the normal molding machine.

In this mold core cooling device, if the cooling unit 8 is prepared in advance, it is sufficient to perform simple drilling and threading on the core 2 and the template 1, and The processing can be extremely simplified and the cooling unit 8 can be easily attached thereto. The greatest advantage of this cooling device is that the core 2 and the template 1 do not need to pass through a straight water channel as in the conventional case, so that a cooling hole formed by blind holes as illustrated in FIG. The arrangement of the holes 7 can be freely selected so as to avoid the positions of the pins P1 and P2 that are inserted in the core 2, and thus, until now, a cooling water channel can be substantially provided. It is possible to accurately spot-cool a portion that could not be formed.

FIG. 3 shows another embodiment in which the mounting state of the cooling unit on the mold core is different. That is, in the embodiment shown in FIGS. 1 and 2, the cooling unit 8 is inserted into the template 1 and the core 2 from the vertical direction, but as shown in FIG. It is also possible to insert the cooling unit 8 into the mold in the direction or, if necessary, in an oblique direction. The number of cooling units 8 to be mounted and the insertion sites are individually selected according to the mold conditions.

[0015]

[Effect of device]

 As described above, according to the present invention, the machining of the mold and the mounting work are simplified, and the core part that cannot be forcibly cooled due to the interference with the pins in the conventional line cooling method is also used. A mold core cooling device capable of accurately spot cooling is realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold showing an example.

2 is a plan view of a mold corresponding to the top view of FIG. 1. FIG.

FIG. 3 is a plan view of a mold showing another embodiment.

FIG. 4 is a plan view of a mold showing a conventional example.

5 is a sectional equivalent view of FIG. 4. FIG.

[Explanation of symbols]

 1 template 2 core 3 water channel 4 through hole 5 long hose nipple 6 U-shaped tube 7 cooling hole 7a female screw 8 cooling unit 8A unit base end 9 outer pipe with bottom 9a male screw 10 inner pipe 11, 12 outflow inlet 13 , 14 conduit 15 insertion hole 16 hex head 17 nipple 18 water injection hose C core or cavity P1 ejector pin P2 core pin

Claims (1)

[Scope of utility model registration request] 1. A cooling hole formed as a blind hole at a desired cooling portion of a core incorporated in a template, and an open front end portion is removably inserted into the cooling hole, and cooling water is provided at each base end portion. And a cooling unit formed of an inner and outer double pipe having an inflow and outflow port of the mold core.