JPS61135436A - Manufacture of cooling water path in metallic pattern - Google Patents

Abstract

PURPOSE:To fit easily and tightly the crossed water flow holes in a metallic pattern without boring plug holes and to increase the degree of freedom of design by fitting loosely a sleeve to the prescribed position of said water flow holes, press-fitting a driving pin into the inside hole thereof and expanding the sleeve thereby sealing hermetically the sleeve into said position. CONSTITUTION:The cylindrical sleeve 11 is loosely fitted to the prescribed position of the water flow holes 10 bored so as to cross each other in the metallic pattern K. The driving pin 12a is press-fitted into the inside hole of such sleeve 11 to expand and seal hermetically the sleeve. The sleeve is easily and tightly fitted to said position without boring the plug hole as in the conventional practice, by which the degree of freedom in designing the cooling water flow passage of the metallic pattern is increased. A taper pin and spherical ball may be used in place of the pin 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a cooling channel in a mold, and particularly to a method for manufacturing a cooling channel in a mold that allows the cooling channel to be easily formed.

[Conventional technology]

2. Description of the Related Art Generally, there are molds for injection molding, etc., in which a cooling channel is formed, and a cooling fluid is poured into the mold to perform molding while cooling the mold.

The method for manufacturing cooling channels in such molds is as follows:
Conventionally, for example, devices shown in FIGS. 8 and 7 are known. This is done by drilling a plurality of through holes 2 in a mold 1 along the same plane and intersecting at predetermined positions, for example in the shape of a parallel cross, and then from a direction perpendicular to the plane.
A plug hole 3 is bored through the through hole 2 at a predetermined position, and then a stopper rod 4 is press-fitted into the plug hole 3 to close the through hole 2. The cooling water channel 5 is formed by bending, as shown by the dashed line in FIG. 6, so that the cooling water bypasses the closed passage hole 2. The reason why the cooling channel 5 is formed by blocking the through hole 2 in this way is because it is not possible to drill a bent passage in the mold 1 from the beginning, and also because the cooling channel is bent. This is to allow the entire mold l to be evenly cooled without stagnation of the cooling water. Also, reference numeral 6 is a stopper that closes the opening of the through hole 2.

[Problem that the invention seeks to solve]

However, in such a conventional method for producing a cooling water channel in a mold, in addition to drilling one hole 2, a plug hole 3"
Since the holes must also be drilled, the work becomes more complicated.

In addition, if a large number of through holes 2 are crowded, the plug holes 3 will interfere with the through holes 2 that do not need to be blocked, so there will be restrictions on the fabrication of the cooling water channel, and it will not be possible to obtain the desired cooling water channel. There was a problem.

The invention has been made in view of the above problems, and its purpose is to facilitate the work of producing cooling water channels and to increase the flexibility in design.

[Means for solving problems]

The method is to drill a plurality of through holes in the mold that intersect with each other at one of the holes, and to form a cooling water channel by blocking a part of the through holes, as appropriate. According to a method for producing a cooling channel in a mold, in which a cylindrical sleeve is loosely fitted in the position, a driving pin is press-fitted into the sleeve, and the sleeve is expanded to tightly fit it into the through hole. .

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, based on the Example shown to an accompanying drawing, the manufacturing method of the cooling waterway based on invention is demonstrated in detail.

In the embodiment shown in FIGS. 1 to 4, a plurality of through holes 10 are drilled in advance in the mold K in a cross-shaped pattern on the same plane. Now, as shown in Figure 1, one direction (X direction in the figure)
Through holes IQa and 10b drilled in and through holes IQa
, through holes toe and lOd, which are bored in the direction perpendicular to IOb (Y direction in the figure), and through hole 10a.
Let the intersections between tob and through holes 10c and 10d be P and Q, respectively, and the intersections between tob and through holes 10c and 10d be R and S, respectively. Then, the middle of the through hole 10a between the intersections P and Q is closed, and a cooling water channel is formed which communicates in the order of the through hole 10a - the through hole 10c → the through hole 10b → the through hole 10d → the through hole 10a (P→R in the figure). A case will be described in which a chain line (dotted chain line connecting -34Q) is produced.

In addition, as a member for closing the passage hole 10a between the intersections P and Q, a sleeve 11 is used, as shown in FIG.
and a driving pin 12 are used.

The sleeve 11 is a cylindrical member, and its inner wall 1
1a is formed in a tapered shape, and its outer diameter is slightly smaller than the circular diameter of the through hole IO. Further, the driving pin 12 is composed of a head portion 12a having a slightly smaller diameter than the through hole IO and a body portion 12b extending from the head portion 12b. has been done. Then, by press-fitting the driving pin 12, the sleeve 11 is expanded and its outer diameter becomes large, and the sleeve 11 is expanded.
, so as to fit tightly into the sight hole lO.

Therefore, in order to close the through holes 10a at the intersections P and Q with the sleeve 1 and the driving pin 12, for example, the procedure shown in FIG. 3 is performed.

First, as shown in FIG. 3(a), the through hole 1 is inserted into the through hole 10d.
A presser rod 13 having a diameter smaller than o is inserted so as to pass through the intersection Q.

Next, as shown in FIG. 3(b), with the driving pin 12 inserted into the sleeve 11, both IT! 2 through hole 1
0a from the intersection P side. In this case, the outer diameter of the sleeve 11 and the head 12a of the driving pin 12 is equal to the diameter of the through hole 10.
11 and 12 are easily inserted.

Then, as shown in FIG. 3(c) and FIG.
Insert the driving rod 14 into the driving pin 12 until it touches the head 12a of the driving pin 12, and hit it with a hammer or the like, or use hydraulic pressure or the like to tighten the driving pin! 2 into the sleeve 11. In this case, the body 12b of the driving pin 12 and the inner wall of the sleeve 11! Since +a is formed in a tapered shape, the IH portion +2b is forced to expand while tightly fitting into the E-oriented side wall 11a, and the sleeve 11 has an increased outer diameter and fits into the through hole 10a. It is tightly fitted and fixed. Further, the driving pin 12 and the sleeve 11 are connected to the driving rod 1.
4 attempts to move the through hole 10a beyond the intersection Q, but since the presser rod 13 is located at the intersection Q, the sleeve! (2) never crosses #1II-L and intersection Q on the presser bar 13.

Thereafter, as shown in FIG. 3(d), the presser rod 13 and driving rod 14 may be pulled out from the through holes 10d and 10a, respectively. In this case, both 13 and 14 are removed from the through holes 10.
Since the diameter is smaller than the inner diameter of the tube, it can be easily removed. Further, the stopper plug 6 may be press-fitted into the opening of the through hole IO.As shown in FIG. 3(e), the insertion opening of the presser rod 13 can be The plug 6 is press-fitted. In this state, as shown in FIGS. 1 and 3(e), a cooling water channel (dotted chain line connecting the intersection P4R→SQ in the figure) is formed.

Also, if cooling water is poured into this cooling channel,
Since the L driving pin 12 is tightly fitted into the sleeve 11, and the sleeve 11 is tightly fitted into the through hole 10a, cooling water will not leak from these parts, and the cooling water will flow along the cooling channel. It will flow.

Further, the hole indicated by the two-dot chain line in FIG. 3(f) is the plug hole 3 shown in the conventional example, and this plug hole 3 is unnecessary in the wooden embodiment.

In the above embodiment, the presser rod 13 is used to prevent the sleeve +1 from being moved excessively by the driving rod 14, but if the sleeve 11 can be instantly and tightly fitted into the through hole 10a, this presser rod is not necessarily required. There is no need to use 13. Further, in the above embodiment, the driving pin 12 has the head L2a, but the body part 1 of the driving pin 12 is not necessarily
2b and the inner wall 11a of the sleeve 11 are formed in a tapered shape, but the shape is not necessarily limited to this and may be modified as appropriate. Furthermore, part of the through hole 10 (through hole 10a, lOb, lOc, lod) in the above embodiment
Although the description has been made by applying it to the sleeve 11, it is not necessarily limited to this, and it goes without saying that the application may be applied to any part of the other through holes 10. A desired cooling channel may be formed by arranging several cooling channels. Also,
The through holes 10 do not necessarily have to be formed in the same plane in the shape of a parallel cross.

[Effects of Part II]

As explained in 1-1 above, according to the method for producing a cooling channel in a mold according to the present invention, there is no need to drill a plug hole as in the conventional method, and the through hole can be easily closed. Workability is improved, and the degree of freedom in design is increased because the through hole can be closed at a desired position compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the structure of a cooling channel according to an embodiment of the present invention, FIG. 2 is a partially cutaway exploded perspective view showing a sleeve and driving pin used in an embodiment of the present invention, and FIG. Figure 3 (
a) to (e) are explanatory diagrams showing the production order of cooling channels according to the embodiment of the present invention, and FIG. 3(f) is f- in FIG. 3(e).
Fig. 4 is a sectional view of the main part showing the driving state of the pin, Fig. 5 is a perspective view showing another example of the driving pin, Fig. 6 is a perspective view showing another example of the driving pin.
The figure is a partially cutaway perspective view showing an example of the structure of a conventional cooling water channel, and FIG. 7 is a sectional view of a main part showing a closed state of the through hole. 1, K...Mold 2, IO...Through hole 8, L...Cooling channel ti...Sleeve 12...Driving pin patent applicant Nissan Motor Co., Ltd. No. 3 (f) = 4 Diagram 'Blind S Diagram

Claims (1)

[Claims] When drilling a plurality of through holes in the mold that intersect with each other at one of the holes and closing a part of the through holes to form a bent cooling water channel, insert a cylindrical hole at an appropriate position of the through hole. A method for producing a cooling water channel in a mold, comprising loosely fitting a sleeve, press-fitting a driving pin into the sleeve, and expanding the sleeve to tightly fit it into a through hole.