JP2849497B2 - Water-cooled copper mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Since the present invention is of an assembling form in which a back frame is bolted to a copper plate serving as a main body of a mold, a distance between main water grooves is wider in a bolt tightening area than in other areas. Water-cooled copper mold.

[0002]

2. Description of the Related Art In a water-cooled copper mold of this type, a slit is formed in a copper plate, and a back frame is bolted to a side where the slit is formed, whereby the slit is formed as a water groove.
The water grooves are formed in parallel, one end of which is an inlet and the other end of which is an outlet.

[0003] Since there must be no water leakage from the ditch,
The bolts are arranged at appropriate intervals. However, since the bolts hinder the formation of water grooves in the bolt fastening region X, as shown in FIGS. The interval between the slits is wider than that in the region Y, and there is a disadvantage that the cooling efficiency is deteriorated accordingly.

[0004]

Therefore, in the bolt tightening portion area X, as shown in FIGS. 5 and 6, an additional main water is provided in the middle between the left and right water grooves, avoiding the bolt screw hole 5a. The means for forming the groove 2b and providing the branch groove 2d from the main water grooves 2a, 2a to the additional main water groove 2b was tried. However, simply adding a slit has a problem that the cross-sectional area of the water groove increases as a whole, so that the flow velocity of the cooling water decreases accordingly, and conversely, the cooling effect of the additional slit portion decreases (see FIGS. 7 to 7). 13 will be described later).

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem. In the case where an additional main water groove and a branch groove to the main water groove are formed between the main water grooves, the cooling effect in the bolt tightening portion region is uniform. It was intended to provide an increasing water-cooled copper mold.

[0006]

In order to achieve the above-mentioned object, the present invention provides a cooling water groove formed by slitting a back frame by bolting a copper plate having a slit formed therein. In a water-cooled copper mold where the distance between the main water grooves is wider than in other areas, in the area of the bolt tightening part, add an additional main water groove in the middle part between the left and right water grooves, avoiding the screw holes. And forming a branch groove from the main water groove to the additional main water groove, and at least one of the branch groove and the branch portion of the main water groove, with respect to the main water groove and the additional main water groove, Branch grooves and branches
But one to three times the width and / or no depth
It is characterized by being doubled .

[0007]

When the cooling water flows into the main ditch from one end, the cooling water is branched into the main ditch and the additional main ditch. In any case, the water is discharged from the other end of the main ditch.
The branch groove and the branch portion increase the width by 1 to 3 times and
When the depth and / or depth is increased by one or two times , the flow resistance is reduced in that portion , so that the flow rate of the cooling water in the main water groove and the additional main water groove is increased.

[0008] The increase in the cross section of water passage depends on the width and depth of the slit. If the depth exceeds twice, energy loss due to branching and joining of the cooling water increases, and the effect of increasing the flow velocity decreases. Also, increasing the depth reduces the effective wall thickness of the mold, so there is a restriction in this respect.

When the width of the slit is more than three times, the effect of increasing the flow velocity is reduced due to the energy loss due to the branching and merging of the cooling water, and the flow tends to stagnate and become saturated.

[0010] Therefore, with respect to increasing the cross section of the water passage, the branch groove and the branch portion have a width of 1 to 3 times and / or a depth of 1 to 3 times with respect to the main water groove and the additional main water groove. Preferably, it is doubled.

[0011]

BRIEF DESCRIPTION OF THE PREFERRED embodiment of the present invention in FIG surface.

FIGS. 1 and 2 show a mold according to an embodiment of the present invention. FIG. 1 is an explanatory diagram viewed from a plane showing a state in which a slit 2 is formed in a copper plate 1, and FIG. FIG. 4 is an explanatory cross-sectional view of the mold as viewed in the direction of the arrows CC, and the portions corresponding to the directions of the lines DD are illustrated in dotted lines.

The water-cooled copper mold is mainly composed of a copper plate 1 having a slit 2 formed inside, and a back frame 3 is fastened by bolts 5 inside the copper plate 1 to prevent water leakage between the copper plate 1 and the back frame 3. O-ring 4 is interposed. Regarding the arrangement of the bolts 5, three rows are vertically spaced at equal intervals on the left and right, and the location of each row is referred to as a bolt fastening area X and the other area is referred to as another area Y.

In the bolt tightening portion region X, main water grooves 2a, 2a are provided so as to sandwich the rows of the bolt screw holes 5a, 5a, 5a, and both ends and the center thereof, ie, close to the bolt screw holes 5a. The branch part 2c is formed widely in the place where it did. Between the adjacent bolt screw holes 5a, 5a, an additional main water groove 2b is provided in the middle of the main water grooves 2a, 2a and runs in parallel with the main water grooves 2a. The branch groove 2d extends from the branch portion 2c to the additional main water groove 2b. And the branch groove 2d is formed deeply.

When the width of the main water groove 2a and the additional main water groove 2b is represented by w, and the width of the branch portion 2c and the branch groove 2d is represented by W,
Make W one to three times w. The depth of the main water groove 2a and the additional main water groove 2b is t, the branch portion 2c and the branch groove 2
Assuming that the depth of d is T, T is 1 to 2 times t.

The above embodiment has a basic form of the mold shown in FIGS. 3 and 5 in which three bolts 5 are arranged in one row. Will be described.

FIG. 9 shows another embodiment corresponding to FIG. 1. As a comparative example, FIG. 7 shows a conventional example (corresponding to FIG. 3), and FIG. 8 shows an unfinished example of an additional slit type. (Corresponding to FIG. 5).

In the above figures, the slit widths W, w
If shows a flow velocity measurement position of the cooling water _(v 1 _{~v 5).} Incidentally, v arrows shown on the ₁ to v ₅ shows the flow direction of the cooling water, also slit depth is the mold same.

FIG. 10 shows v ₁ to v ₅ in each template.
Is the measured value of the flow velocity. In the mold (FIG. 8) of the unfinished example, the flow velocity _{v 2} and _{v 3} of the cooling water is 3.5 m / sec and 3.0 m / sec, compared _{v 1} and in the conventional example template (Fig. 7) The flow rate is reduced to 60-70%.

Meanwhile, the flow velocity of _{v 4} and _{v 5} in the present invention embodiment template (Fig. 9) is, 5 m / sec and 4.9
m / sec, and the flow rate is almost the same as that of the conventional mold (FIG. 7).

Further, a comparison of the cooling effect will be described with reference to FIGS. 11 to 13 (each sectional view of FIGS. 7 to 9). As casting conditions, the casting speed was 200 cm / min,
This is when the cooling water temperature is 35 ° C. FIG. 11 shows a conventional example mold,
FIG. 12 is an unfinished mold in which branch slits are simply added, and FIG. 13 is a mold of the embodiment of the present invention. .

According to this, in the conventional mold, the temperature of the casting surface is 200 ° C. to 250 ° C., and there is a temperature difference of 50 ° C. between them. Further, the temperature is 205 ° C. to 248 ° C. for an unfinished mold in which branch slits are simply added. On the other hand, in the mold of the present invention, the temperature is 200 ° C to 205 ° C. This means that the slit depth is 1-2 times larger than that of the conventional example.
The same effect can be obtained when the depth is doubled. Therefore, in order to increase the effect of the branch slit, it is important to appropriately widen or deepen the slit width and depth of the branch slit extension portion and maintain the flow rate of the cooling water.

[0023]

As described above, according to the present invention, in order to improve the cooling effect in the bolt tightening area of the water-cooled copper mold having the cooling water groove, the water cooling copper mold is provided at the intermediate portion between the left and right main water grooves. It simply solved the problem that the desired effect could not be obtained simply by forming an additional main water groove or a branch groove to it. At least one of the branch groove and the branch part of the main water groove About the main ditch and additional main ditch
Grooves and branches may increase the width by one to three times and / or
Alternatively, since the depth is made one or two times, the flow rate and the flow rate of the cooling water are prevented from decreasing, and there is an extremely excellent effect that a uniform cooling function is exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of a copper plate showing one embodiment.

FIG. 2 is an enlarged cross-sectional explanatory view taken along a line CC of FIG. 1 (a line indicated by a line DD is indicated by a dotted line).

FIG. 3 is an explanatory view corresponding to FIG. 1 showing a conventional example.

FIG. 4 is an explanatory view corresponding to FIG. 2 as viewed from the direction of arrows AA in FIG. 3;

FIG. 5 shows a comparative example that is a mere slit extension type.
FIG.

FIG. 6 is an explanatory view corresponding to FIG. 2 as viewed in the direction of arrows BB in FIG. 5;

FIG. 7 is an explanatory diagram showing another conventional example.

FIG. 8 is an explanatory view showing another comparative example that is a mere slit extension type.

FIG. 9 is an explanatory view corresponding to FIGS. 7 and 8 showing another embodiment.

FIG. 10 is a graph comparing the flow rates of the cooling water of FIGS. 7, 8, and 9;

FIG. 11 is an explanatory sectional view showing another conventional example.

FIG. 12 is an explanatory sectional view showing another comparative example that is a mere slit extension type.

FIG. 13 is an explanatory diagram corresponding to FIGS. 11 and 12, showing another conventional example.

[Explanation of symbols]

 Reference Signs List 1 Copper plate 2 Slit 2a Main water groove 2b Extension main water groove 2c Branch of main water groove 2d Branch groove 3 Back frame 5 Bolt 5a Bolt screw hole X Bolt tightening area Y Other area

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenzo Yamamoto 1 Nishi-Ashiwara, No. 1, Tateyama-machi, Nakashinagawa-gun, Toyama 1 (56) References Japanese Utility Model Application Sho 60-74829 (JP, U) Japanese Utility Model Application Sho 56-105365 (JP, U) Japanese Utility Model Hei 1-177050 (JP, U) Japanese Utility Model Hei 1-1118846 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22D 11/04

Claims (1)

(57) [Claims] 1. A water cooling system in which a back frame is bolted to a copper plate having a slit to form a cooling water groove formed by the slit, and a space between the main water grooves is wider in a bolt tightening portion area than in other areas. In the type copper mold, in the bolt tightening area, an additional main water groove is formed in the middle part between the left and right main water grooves, avoiding the bolt screw hole, and a branch groove from the main water groove to the additional main water groove is formed. While forming, at least one of the branch groove and the branch portion of the main water groove,
For the main ditch and additional main ditch, the branch groove and branch part are
1 to 3 times the width and / or 1 to 2 depth
A water-cooled copper mold characterized by being doubled .