CN111659872B

CN111659872B - Cooling structure of valve device

Info

Publication number: CN111659872B
Application number: CN202010004298.9A
Authority: CN
Inventors: 松芳隆之; 渡边英辉; 正田太一
Original assignee: JATCO Ltd
Current assignee: JATCO Ltd
Priority date: 2019-03-05
Filing date: 2020-01-03
Publication date: 2022-06-21
Anticipated expiration: 2040-01-03
Also published as: JP2020142258A; JP7286242B2; CN111659872A

Abstract

A cooling structure of a valve device can properly cool the valve device. A cooling structure (1) of a valve device (5) includes: a casting mold (2) in which a cavity corresponding to the shape of a cast product is formed between the fixed mold (3) and the movable mold (4); and a valve device (5) which is provided in the fixed mold (3) and switches between communication and blocking between the cavity and a vacuum-pumping device for reducing the pressure in the cavity. A nozzle part (7) of a blowing device for blowing cooling water to the valve device (5) is provided in the fixed mold (3). The nozzle section (7) is fixed to a valve holder (6) that fixes the valve device (5) to the stationary mold (3), and the discharge port (71) faces the valve device (5).

Description

Cooling structure of valve device

Technical Field

The present invention relates to a cooling structure of a valve device.

Background

There is known a vacuum die casting method in which a pressure in a cavity formed between a fixed die and a movable die is reduced, and a casting molten alloy is poured into the cavity to cast a product.

A valve device (NVV valve: vacuum valve) is provided on the mold for casting. The valve means is provided for preventing molten alloy injected into the cavity from being drawn into the side of the vacuum-pumping means for depressurizing the cavity.

Valve devices of this type are provided in the mould at the connection to the evacuation device. In the valve device, when the molten alloy injected into the cavity extrudes the piston, the valve (valve body) which operates in conjunction with the extrusion of the piston blocks the communication between the cavity and the vacuum-pumping device.

Since heat of the high-temperature molten alloy acts on the valve device, the components of the valve device such as the piston thermally expand.

Thermal expansion of the constituent members may cause malfunction of the valve device. Therefore, when the mold is opened, a release agent or cooling water is blown around the valve device from a nozzle provided separately from the mold, thereby suppressing thermal expansion of the components (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: JP 2003-112346 publication

Problems to be solved by the invention

However, when the components are cooled by blowing a release agent or cooling water around the valve device, the following problems arise. (a) It is necessary to adjust the blowing range of the release agent or the cooling water. (b) Since the mold release agent or the cooling water is blown off when the mold is opened in the middle of continuous casting, the blowing time (cooling time) cannot be sufficiently ensured.

Accordingly, it is required to be able to appropriately cool the valve device.

Disclosure of Invention

Means for solving the problems

The cooling structure of a cast valve device of the present invention includes:

a casting mold in which a cavity corresponding to the shape of a cast product is formed between a fixed mold and a movable mold;

a valve device provided in one of the fixed-side mold and the movable-side mold, for switching communication/blocking between the cavity and a vacuum-pumping device for reducing a pressure in the cavity,

the one mold is provided with a blowing device for blowing a cooling medium to the valve device.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the valve device can be appropriately cooled.

Drawings

Fig. 1 (a) and (b) are views illustrating a cooling structure of the valve device.

Fig. 2 (a) to (c) are views illustrating the valve holder and the nozzle.

FIGS. 3 (a) to (f) are views for explaining the nozzle part 1.

FIGS. 4(a) to (e) are views for explaining the 2 nd nozzle member.

FIG. 5 (a) and (b) are views for explaining the 2 nd nozzle part.

Fig. 6 (a) and (b) are views for explaining a nozzle portion formed by joining the 1 st nozzle member and the 2 nd nozzle member.

Fig. 7 (a) and (b) are views for explaining a nozzle portion formed by joining the 1 st nozzle member and the 2 nd nozzle member.

Fig. 8 (a) and (b) are views for explaining the operation of the nozzle portion.

Description of the reference numerals

1 Cooling Structure

2 casting mould

20 exhaust path

3 fixed mould

31 recess

4 Movable die

5-valve device

5a upper end edge

50 main body part

50a surface

501. 502 support hole

503 communication port

51 pressure-bearing piston

52 valve body

520 shaft part

521 valve part

53 action rod

54 pin

6 valve support

60 bottom wall part

60a surface

600 receiving hole

61 peripheral wall part

61a inner periphery of

61b end face

610 long side part

610a inner circumference

611 short side part

612 receiving part

613 inflow port

7 nozzle part

7a lower end edge

71 discharge port

72 slit

72a, 72b groove

73 slit

73a groove part

73a1 inclined plane

74 opening

74a recess

74b concave part

8 st 1 st nozzle unit

80 base

801 upper side

802 lower side

803. Side 804

805 back side

806 coincident plane

806a inclined plane

82 through hole

9 nd 2 nd nozzle unit

90 base

901 upper edge

902 lower edge

903. 904 side edge

905 Back side

906 coincident plane

906a inclined plane

92 through hole

921 diameter enlarging part

B bolt

Lc center line

PL parting line

R diameter

Width of W1

X, Xa, Y axes

Detailed Description

Hereinafter, embodiments of the present invention will be described.

Fig. 1 is a diagram illustrating a cooling structure 1 of a valve device 5. Fig. 1 (a) is a schematic view showing a region of the fixed mold 3 (fixed mold) where the valve holder 6 is provided, as viewed from the movable mold 4 (movable mold) side. Fig. 1(b) is a sectional view taken along line a-a of fig. 1 (a), and shows an enlarged area of the stationary mold 3 where the valve device 5 is provided, together with the movable mold 4.

Fig. 2 is a diagram illustrating the valve holder 6 and the nozzle portion 7. Fig. 2 (a) is a diagram illustrating the arrangement of the nozzle portion 7 with respect to the valve holder 6. Fig. 2 (b) is a view of the valve holder 6 supporting the nozzle portion 7 as viewed obliquely from below. Fig. 2 (c) is a view for explaining the formation of the nozzle portion 7 by joining the 1 st nozzle member 8 and the 2 nd nozzle member 9.

As shown in fig. 1(b), the casting mold 2 includes a fixed mold 3 and a movable mold 4 that is separated from and in contact with the fixed mold 3. The movable mold 4 is movable in the mold opening direction (the left-right direction in the drawing) of the casting mold 2.

In the casting mold 2, when the fixed mold 3 and the movable mold 4 are joined, a cavity (not shown) corresponding to the shape of a cast product (casting) is formed between the fixed mold 3 and the movable mold 4.

Further, a cavity (not shown) is formed in a region below the region shown in fig. 1 (b).

In the present embodiment, a casting mold 2 is used to cast a cast product by a vacuum die casting method.

The casting by the vacuum die casting method is performed by the following procedure.

(a) After a release agent is applied to the joint surface between the fixed mold 3 and the movable mold 4, the fixed mold 3 and the movable mold 4 are joined (clamped).

(b) The cavity formed between the fixed mold 3 and the movable mold 4 is depressurized by a vacuum extractor (not shown), and in this state, a casting molten alloy is poured into the cavity and solidified.

(c) After the movable mold 4 is separated from the fixed mold 3, the cast product formed by solidifying the molten alloy is taken out (mold opening).

Then, the above steps (a) to (c) are repeated to continuously cast a cast product.

Here, the casting mold 2 is provided with a valve device 5 that switches communication/blocking of the cavity with the vacuum evacuation device.

The valve device 5 is provided on the upper portion of the fixed mold 3 via a valve holder 6. The valve device 5 is provided in the middle of the exhaust path 20, and the exhaust path 20 connects the cavity and the vacuum extractor.

The valve device 5 is provided to prevent the molten alloy reaching the exhaust passage 20 from flowing into the vacuum extractor after the molten alloy is poured into the cavity.

The valve device 5 includes a pressure-receiving piston 51, a valve body 52, and an actuating rod 53.

In the valve device 5, the pressure receiving piston 51 is provided with: the support hole 501 provided in the main body 50 is slidably movable in the mold opening direction (the left-right direction in the drawing) of the movable mold 4.

The valve body 52 is configured to: the support hole 502 provided in the body 50 is slidably movable in the mold opening direction (the left-right direction in the drawing) of the movable mold 4.

In the valve device 5, the pressure receiving piston 51 is located below the valve body 52 on the cavity side. The molten alloy injected into the cavity fills the cavity, and then moves toward the valve device 5 in the exhaust passage 20.

The molten alloy reaching the valve device 5 first acts on the pressure receiving piston 51 exposed on the surface 50a of the valve device 5 facing the movable die 4 (the surface facing the movable die 4), and the pressure receiving piston 51 is pressed by the molten alloy and inserted into the support hole 501 of the valve device 5.

Then, the operating rod 53 is pressed by the pressure receiving piston 51, and the one end 53a of the valve body 52 is engaged and displaced toward the back side (left side in the drawing) of the support hole 502.

The valve body 52 is sucked into the support hole 502 of the valve device 5 by an operation force applied from the one end 53a of the operating rod 53.

Thereby, the gap between the inner periphery of the support hole 502 and the outer periphery of the shaft portion 520 of the valve body 52 is sealed by the valve portion 521, and the communication port 503 with the vacuum extractor in the valve device 5 is closed.

In this way, in the valve device 5, when the molten alloy reaches the pressure receiving piston 51, the gap between the inner periphery of the support hole 502 and the outer periphery of the shaft portion 520 of the valve body 52 is sealed by the valve portion 521, thereby blocking the communication between the cavity and the vacuum-pumping device. This prevents the molten alloy reaching the valve device 5 from flowing into the vacuum extractor.

When a cast product is cast, a high-temperature molten alloy acts on the valve device 5. Therefore, between the mold opening step (c) and the mold closing step (a), a cooling medium (water, oil, or the like) is blown to the valve device 5 to cool the valve device 5.

Here, if the valve device 5 is not sufficiently cooled, for example, the pressure receiving piston 51 and the valve body 52 thermally expand due to high-temperature heat.

Then, the pressure receiving piston 51 and the valve body 52 press against the inner peripheries of the support holes 501 and 502, and movement of the pressure receiving piston 51 and the valve body 52 in the opening direction (the left-right direction in the drawing) is hindered, which may cause operational failure of the valve device 5.

In this case, the molten alloy reaching the valve device 5 cannot be prevented from flowing into the vacuum extractor side.

In the casting mold 2 of the present embodiment, a nozzle portion 7 is provided on a valve holder 6 for attaching the valve device 5 to the stationary mold 3 in order to enable the valve device 5 to be appropriately cooled. The nozzle portion 7 is a component of the blowing device, and blows cooling water (cooling medium) to the valve device 5.

As shown in fig. 1 (a), the valve holder 6 includes a bottom wall 60 and a peripheral wall 61, and the peripheral wall 61 surrounds the entire outer periphery of the bottom wall 60.

The valve holder 6 is rectangular in front view, and the peripheral wall portion 61 is formed in a ring shape, and includes a pair of

long side portions

610, 610 arranged in parallel with each other, and a pair of

short side portions

611, 611 connecting ends of the

long side portions

610, 610 to each other.

The valve holder 6 is provided with the

long side portions

610, 610 of the peripheral wall portion 61 in the vertical direction of the fixed mold 3.

A storage hole 600 for storing the valve device 5 is formed in a substantially central portion of the bottom wall portion 60 surrounded by the peripheral wall portion 61. The housing hole 600 is formed in a region separated inward from the upper and lower

short sides

611, 611 of the peripheral wall portion 61, and this region is in contact with the inner peripheries 610a of the left and right long sides 610, 610.

The receiving hole 600 is formed in a shape matching the outer shape of the valve device 5. As shown in fig. 1(b), the valve device 5 is supported by the valve holder 6 in a state where the outer periphery of the exposed surface 50a side of the pressure receiving piston 51 and the valve body 52 is fitted into the receiving hole 600.

In this state, the lower end edge 7a of the nozzle portion 7 is located above the upper end edge 5a of the valve device 5.

As shown in fig. 1(b), a recessed portion 31 recessed in a direction away from the movable mold 4 is formed in a facing portion facing the movable mold 4 in the upper region of the fixed mold 3.

The valve holder 6 is fixed to the peripheral region of the recess 31 in the fixed die 3 by bolts, not shown. After the valve holder 6 is attached to the fixed mold 3, the valve device 5 supported by the valve holder 6 is accommodated in the recess 31.

In this state, the surface 50a of the valve device 5 and the surface 60a of the bottom wall portion 60 of the valve holder 6 are disposed in a positional relationship of being flush with each other in the mold opening direction (the left-right direction in the drawing) of the movable mold 4. The

surfaces

50a, 60a are located on a parting line PL of the fixed mold 3 and the movable mold 4 of the region of the casting mold 2 where the valve device 5 is provided.

The peripheral wall portion 61 of the valve holder 6 protrudes toward the movable mold 4 side.

In the valve holder 6, a nozzle portion 7 for blowing cooling water (cooling medium) to the valve device 5 is provided in the short side portion 611 positioned on the upper side of the peripheral wall portion 61.

The short side portion 611 of the peripheral wall portion 61 is provided with a housing portion 612 that opens across the inner periphery 61a of the peripheral wall portion 61 and the end surface 61b on the movable mold 4 side. The nozzle portion 7 having the discharge port 71 for the cooling water is provided in the housing portion 612.

As shown in fig. 2 (a), the nozzle 7 is formed by overlapping the 1 st nozzle member 8 and the 2 nd nozzle member 9 in the mold opening direction.

The nozzle 7 is fixed to the housing 612 of the valve holder 6 by a bolt B penetrating the 1 st nozzle member 8 and the 2 nd nozzle member 9. In this state, the 1 st nozzle unit 8 and the 2 nd nozzle unit 9 are inseparably joined.

FIG. 3 is a view illustrating the nozzle unit 8 of the 1 st nozzle unit. Fig. 3 (a) is a plan view of the 1 st nozzle member 8 as viewed from above. Fig. 3 (b) is a front view of the 1 st nozzle member 8 as viewed from the direction of the arrow a-a in fig. 3 (a). Fig. 3 (c) is a bottom view as viewed from the direction of the arrow B-B in fig. 3 (B). Fig. 3 (d) is a cross-sectional view taken along line C-C of fig. 3 (b). Fig. 3 (e) is a D-D sectional view of fig. 3 (b). Fig. 3 (f) is a rear view as viewed from the direction of the E-E arrow in fig. 3 (d).

As shown in fig. 3 (a), the 1 st nozzle member 8 has a plate-like base portion 80, and the plate-like base portion 80 has a thickness Wa.

As shown in fig. 3 (b), the base portion 80 includes an upper side 801 and a lower side 802 that are parallel to each other, and

side edges

803 and 804 that connect ends of the upper side 801 and the lower side 802 to each other when viewed from the front.

The connection portions between the side edges 803 and 804 and the upper edge 801 are curved. The side edges 803 and 804 are provided symmetrically with respect to the center line Lc in the width direction of the base portion 80. The base 80 is formed in a generally rectangular shape when viewed from the front, and includes upper and

lower sides

801 and 802, and

side edges

803 and 804.

A recess 74b recessed toward the lower side 802 is provided in the center of the upper side 801 in the width direction. The concave portion 74b extends linearly toward the lower side 802 on the center line Lc of the base portion 80. The edge 74b1 on the lower edge 802 side of the recess 74b is formed in a substantially semicircular shape.

As shown in fig. 3a, the recess 74b penetrates the base 80 in the thickness direction (vertical direction in the drawing).

As shown in fig. 3 (b) and (d), through

holes

82 and 82 penetrating the base portion 80 in the thickness direction (axis X direction) are provided on both sides of the recess 74b in the width direction of the base portion 80. The through holes 82, 82 are symmetrically provided with respect to the center line Lc in the width direction of the base portion 80.

One surface (back surface 805) of the base portion 80 in the thickness direction is a flat surface orthogonal to the axis X (see fig. 3 (a) and (f)).

As shown in fig. 3 (b) and (d), the other surface (overlapping surface 806) of the base 80 in the thickness direction is a flat surface orthogonal to the axis X in a range having a predetermined height ha from the upper side 801 to the lower side 802 below the through hole 82. The range of the predetermined height hb on the lower side 802 side is inclined surface 806a inclined so that the thickness of base 80 becomes thinner toward the lower side 802 side.

The lower edge 802 connecting the rear surface 805 and the lower end of the overlapping surface 806 is inclined such that the height h of the base 80 decreases toward the overlapping surface 806.

The lower side 802 is inclined at a predetermined angle θ a with respect to an axis Xa parallel to the axis X in a cross-sectional view. The inclined surface 806a provided on the overlapping surface 806 is inclined at a predetermined angle θ b with respect to the axis Y orthogonal to the axis Xa.

As shown in fig. 3 (b), the overlapping surface 806 of the base 80 is provided with a groove 72b recessed toward the back surface 805.

The groove 72b is formed in a range from the concave portion 74b along the center line Lc to the lower side 802.

As shown in fig. 3 (a) and (c), the groove 72b opens into the recess 74b and opens into the lower edge 802 of the base 80.

As shown in fig. 3 (e), the groove 72b is formed at the same depth d1 in the area of the overlapping surface 806 and the area of the inclined surface 806 a.

Fig. 4 and 5 are views for explaining the 2 nd nozzle member 9. Fig. 4(a) is a plan view of the 2 nd nozzle member 9 as viewed from above. Fig. 4 (b) is a front view of the 2 nd nozzle unit 9 as viewed from the direction of the arrow a-a in fig. 4 (a). Fig. 4 (c) is a bottom view as viewed from the direction of the arrow B-B in fig. 4 (B). Fig. 4 (d) is a cross-sectional view taken along line C-C of fig. 4 (b). Fig. 4 (e) is a rear view as viewed from the direction of the D-D arrow in fig. 4 (D).

Fig. 5 (a) is a cross-sectional view E-E of fig. 4 (b). Fig. 5 (b) is a sectional view F-F of fig. 4 (b).

As shown in fig. 4(a), the 2 nd nozzle member 9 joined to the 1 st nozzle member 8 has a plate-like base portion 90, and the plate-like base portion 90 has a thickness Wb. The thickness Wb of the base 90 has a thickness thicker than the thickness Wa (refer to (a) of fig. 3) of the base 80 on the 1 st nozzle member 8 side.

As shown in fig. 4 (b), the base portion 90 includes an upper side 901 and a lower side 902 which are parallel to each other, and side edges 903, 904 which connect ends of the upper side 901 and the lower side 902 to each other when viewed from the front.

The connecting portions between the side edges 903 and 904 and the upper edge 901 are curved. The side 903 and the side 904 are symmetrically disposed with respect to the center line Lc in the width direction of the base 90. The base 90 is formed in a substantially rectangular shape in plan view, and includes upper and

lower sides

901 and 902, and

side edges

903 and 904.

A recess 74a recessed toward the lower side 902 is provided in the center of the upper side 901 in the width direction. The recessed portion 74a extends linearly toward the lower side 902 on the center line Lc of the base portion 90. The edge 74a1 on the lower edge 802 side of the recess 74a is formed in a substantially semicircular shape.

As shown in fig. 4(a), the rear face 905 side of the recess 74a is closed, and the recess 74a is open only to the bonding face 906 side.

The concave portion 74a is formed in a shape matching the concave portion 74b on the 1 st nozzle member 8 side when viewed from the front.

As shown in fig. 4 (b) and (d), through

holes

92, 92 penetrating the base 90 in the thickness direction (axis X direction) are provided on both sides of the recess 74a in the width direction of the base 90. The through holes 92, 92 are symmetrically provided with respect to the center line Lc in the width direction of the base portion 90.

As shown in fig. 4 (d), on the rear face 905 side of the through hole 92, a diameter-enlarged portion 921 having an inner diameter larger than that of the through hole 92 is provided concentrically with the through hole 92.

As described above, the nozzle portion 7 including the 1 st nozzle member 8 and the 2 nd nozzle member 9 is fixed to the valve holder 6 by the bolt B (see fig. 2 (a)).

The diameter-enlarged portion 921 has an inner diameter capable of receiving the head of the bolt B.

These through

holes

92, 92 are formed in shapes matching the through holes 82, 82 (see fig. 2 (c)) on the 1 st nozzle member 8 side. When the 1 st nozzle member 8 and the 2 nd nozzle member 9 are joined, the through

holes

82, 82 on the 1 st nozzle member 8 side and the through

holes

92, 92 on the 2 nd nozzle member 9 side are arranged in a positional relationship overlapping in the joining direction of the 1 st nozzle member 8 and the 2 nd nozzle member 9.

One surface (back surface 905) in the thickness direction of the base 90 is a flat surface orthogonal to the axis X (see fig. 4(a) and (c)). As shown in fig. 4 (b) and (d), the other surface (overlapping surface 906) of the base 90 in the thickness direction is a flat surface orthogonal to the axis X in a range from the upper side 901 to the lower side 902 below the through hole 92, and having a predetermined height hc. The range of the predetermined height hd on the lower side 902 side is an inclined surface 906a formed in a direction such that the thickness of the base 90 increases toward the lower side 902.

The lower edge 902 connecting the rear surface 905 and the lower end of the overlapping surface 906 is inclined such that the height h of the base 90 decreases toward the rear surface 905.

The lower side 902 is inclined at a predetermined angle θ a with respect to an axis Xa parallel to the axis X in a cross-sectional view.

The inclined surface 906a provided on the overlapping surface 906 is inclined at a predetermined angle θ b with respect to an axis Y orthogonal to the axis X.

Here, the inclination angle (predetermined angle θ a) of the lower side 902 with respect to the axis Xa is the same as the angle θ a of the lower side 802 on the 1 st nozzle member 8 side with respect to the axis Xa.

The angle θ b of the inclined surface 906a of the overlapping surface 906 with respect to the axis Y is the same as the angle θ b of the inclined surface 806a on the 1 st nozzle member 8 side with respect to the axis Y.

As shown in fig. 4 (b), a groove 73a recessed toward the back face 905 is provided on the overlapping surface 906 of the base 90 in a region between the through hole 92 and the through hole 92.

The groove 73a is formed in a rectangular shape in a region where interference with the through

holes

92, 92 is avoided when viewed from the front. The groove portion 73a is formed to have a predetermined width W1 in the width direction of the base portion 90, and the center line of the groove portion 73a in the width direction coincides with the center line Lc of the base portion 90.

As shown in fig. 4 (b) and 5 (a), the groove 73a is a flat surface perpendicular to the axis X in a range from the upper side 901 to the side of the through hole 92 and having a predetermined height he. The range of the predetermined height hf on the lower side 902 side is the inclined surface 73a1 formed in a direction such that the thickness of the base 90 increases as the lower side 902 side becomes closer.

As shown in fig. 5 (a), the angle θ c of the inclined surface 73a1 of the groove 73a with respect to the axis Y is larger than the angle θ b of the inclined surface 906a of the overlapping surface 906 with respect to the axis Y (θ c > θ b).

Therefore, in the region of the groove portion 73a where the inclined surface 73a1 is provided, the separation distance d4 between the inclined surface 906a on the bonding surface 906 side and the inclined surface 73a1 on the groove portion 73a side becomes narrower toward the lower side 902 side.

The distance d3 between the groove 73a and the engagement surface 906 is constant or substantially constant. The separation distances d3, d4 are the separation distances of the 1 st nozzle unit 8 and the 2 nd nozzle unit 9 in the joining direction.

As shown in fig. 4 (b) and (c), in the region of the base 90 where the groove 73a is formed, a groove 72a recessed toward the back face 905 is provided.

The groove 72a is formed in a range from the concave portion 74a along the center line Lc to the lower side 902.

As shown in fig. 5 (b), the lower edge 902 side region of the groove 72a is provided in parallel with the inclined surface 906a of the overlapping surface 906.

As shown in fig. 4 (c), the width d2 of the groove 72a is the same as the groove 72b on the 1 st nozzle member 8 side (see fig. 3 (c)).

Fig. 6 and 7 are views for explaining the nozzle portion 7 formed by joining the 1 st nozzle member 8 and the 2 nd nozzle member 9. Fig. 6 (a) is a plan view of the nozzle 7 as viewed from above, and fig. 6 (b) is a bottom view of the nozzle 7 as viewed from below on the valve device 5 side.

Fig. 7 (a) is a cross-sectional view of the area around the nozzle 7 taken along the line F-F in fig. 4 (b). Fig. 7 (b) is a sectional view of the area around the nozzle 7 taken along the line E-E in fig. 4 (b).

Fig. 8 is a diagram illustrating the operation of the nozzle unit 7. Fig. 8 (a) is a cross-sectional view of the periphery of the nozzle 7. FIG. 8 (B) is a developed view as viewed from the direction of the arrow A-B-C in FIG. 8 (a).

As shown in fig. 6 (a), the 1 st nozzle member 8 and the 2 nd nozzle member 9 are joined to each other by overlapping the overlapping

surfaces

806 and 906 with each other.

When the 1 st nozzle member 8 and the 2 nd nozzle member 9 are joined, the upper side 801, the lower side 802, and the side edges 803, 804 of the 1 st nozzle member 8 are arranged in a positional relationship in which they are flush with the upper side 901, the lower side 902, and the side edges 904, 903 of the 2 nd nozzle member, respectively (see fig. 2 (a)).

As shown in fig. 6 (a), when the 1 st nozzle member 8 and the 2 nd nozzle member 9 are joined, the recess 74b on the 1 st nozzle member 8 side and the recess 74a on the 2 nd nozzle member 9 side are arranged in a positional relationship such that they overlap in the joining direction (vertical direction in the drawing) of the 1 st nozzle member 8 and the 2 nd nozzle member 9.

Thereby, an opening 74 serving as an inlet for the cooling water is formed in the upper portion of the nozzle portion 7 (see fig. 6 (a)).

As shown in fig. 6 (b), when the 1 st nozzle member 8 and the 2 nd nozzle member 9 are joined, the groove 72b on the 1 st nozzle member 8 side and the groove 72a on the 2 nd nozzle member 9 side are arranged in a positional relationship in which they overlap in the joining direction (vertical direction in the drawing) of the 2 nd nozzle member 9 and the 1 st nozzle member 8.

Thereby, a slit 72 serving as a discharge port of the cooling water is formed in the lower portion of the nozzle portion 7.

Further, in the lower portion of the nozzle 7, a slit 73 serving as a discharge port of the cooling water is formed between the groove 73a (inclined surface 73a1) on the 2 nd nozzle member 9 side and the joint surface 806 of the 1 st nozzle member 8.

The slit 73 is formed linearly along the joint surface between the 2 nd nozzle unit 9 and the 1 st nozzle unit 8. The slit 72 is formed in a longitudinal center of the slit 73 in a direction perpendicular to the slit 73.

A cooling water discharge port 71 is formed in a substantially cross shape on the lower surface of the nozzle 7 by the two

slits

72 and 73.

As shown in fig. 7 (a), in the valve holder 6 to which the nozzle portion 7 is fixed, a housing portion 612 that houses the nozzle portion 7 is provided on the short side portion 611 located on the upper side. An inlet 613 for a cooling medium (water) is opened in a region of the short side portion 611 on the outer peripheral side of the housing portion 612.

The inlet 613 overlaps the opening 74 of the nozzle 7 in a region on the end surface 61b side (right side in the figure) of the short side portion 611. As shown by the imaginary line in fig. 6 (a), the inlet 613 is provided in a positional relationship overlapping the recess 74b on the 1 st nozzle member 8 side when viewed from above.

The inlet 613 of the valve holder 6 communicates with the opening 74 formed between the 1 st nozzle member 8 and the 2 nd nozzle member 9 at the upper portion of the nozzle 7.

A branch pipe (not shown) branched from a pipe for supplying cooling water to the fixed mold 3 is connected to the inflow port 613, and part of the cooling water of the fixed mold 3 is supplied to the inflow port 613 of the valve holder 6.

Therefore, as shown in fig. 7 (a) and (b), when the cooling water is supplied to the inlet 613, the supplied cooling water is supplied to the opening 74 in the upper portion of the nozzle 7.

As shown in fig. 6 (a), the opening 74 communicates with the two

slits

72 and 73, and the cooling water supplied into the opening 74 is discharged from the discharge port 71 opened in the lower surface of the nozzle portion 7 through the

slits

72 and 73.

As shown in fig. 7a, the ejection port 71 opens in the opening direction (the left-right direction in the drawing) of the movable mold 4 at a position away from the surface 60a of the bottom wall portion 60 of the valve holder 6 toward the movable mold 4.

The surface 60a of the bottom wall portion 60 is located on a parting line PL between the fixed mold 3 and the movable mold 4, and the ejection port 71 opens at a position separated from the parting line PL toward the movable mold 4.

As shown in fig. 8 (a), the nozzle portion 7 is provided with a discharge port 71 directed toward the valve device 5 located below, and the cooling water discharged from the discharge port 71 acts on the surface 50a of the valve device 5 from obliquely above.

As shown in fig. 8 (b), on the surface 50a of the valve device 5, the valve body 52 and the pressure receiving piston 51 are arranged vertically on the center line Lc in the width direction of the valve device 5.

In the present embodiment, the width W1 of the slit 73 is set larger than the diameter R of the valve body 52. The cooling water ejected from the slit 73 reliably blows to the area where the valve body 52 and the pressure receiving piston 51 are exposed.

Further, the slit 72 is provided at a position intersecting the center line Lc. Therefore, more cooling water can be actively supplied to the region that needs to be cooled, that is, the region where the valve body 52 and the pressure receiving piston 51 are arranged vertically.

The operation of the nozzle section 7 according to the present embodiment will be described below.

As described above, the nozzle portion 7 is formed by overlapping the overlapping surface 806 of the 1 st nozzle member 8 with the overlapping surface 906 of the 2 nd nozzle member 9.

In this state, slits 72 and 73 functioning as passages for the cooling water are formed in the nozzle portion 7. The portion of the

slits

72 and 73 that opens to the lower surface of the nozzle portion 7 is a discharge port for the cooling water.

Here, when the casting mold 2 is closed, the abutting portion 41 of the movable mold 4 is inserted to the lower side (the valve device 5 side) of the ejection port 71 of the nozzle portion 7, thereby sealing the ejection port 71 of the nozzle portion 7 (refer to fig. 1 (b)).

The discharge port 71 opens at a position separated toward the movable mold 4 in the mold opening direction of the movable mold 4 from the parting line PL between the fixed mold 3 and the movable mold 4 in the region where the valve device 5 is provided.

Therefore, the molten alloy reaching the valve device 5 reaches the discharge port 71 of the nozzle portion 7, and the discharge port 71 is not blocked by the molten alloy.

After the communication between the cavity and the vacuum extractor is blocked by the valve device 5, the movable mold 4 is moved in a direction away from the fixed mold 3.

Then, when the seal of the ejection port 71 by the abutting portion 41 of the movable mold 4 is released, the cooling water is blown from the ejection port 71 toward the valve device 5.

Here, as shown in fig. 7 (b), the slit 73 is formed in such a direction that the cross-sectional area becomes smaller toward the lower side of the valve device 5. Therefore, the cooling water discharged from the slit 73 reaches the surface 50a of the valve device 5 with directivity when discharged from the slit 73.

Further, the width W1 (refer to fig. 8 (b)) of the slit 73 is set larger than the diameter R of the valve body 52. Therefore, the cooling water ejected from the slit 73 can be reliably blown to the region where the valve body 52 and the pressure receiving piston 51 are exposed, thereby reliably cooling the valve body 52 and the pressure receiving piston 51. Further, since the cooling water is blown to a wide range of the surface 50a of the valve device 5, the valve device 5 as a whole can be cooled.

Further, by providing the slits 72, more cooling water can be blown to the region below the slits 72 in the surface 50a of the valve device 5.

This makes it possible to actively supply cooling water to the portion of the surface 50a of the valve device 5 that needs to be cooled.

As shown in fig. 8 (b), the

pins

54, 54 are located between the valve body 52 and the pressure receiving piston 51.

The

pins

54, 54 are provided for the purpose of: a spring Sp (see fig. 1(b)) in the valve device 5 is pressed toward the inner side of the valve device 5, so that the biasing force of the spring Sp does not act on the valve body 52 and the pressure-receiving piston 51.

In a state where the biasing force of the spring Sp acts on the valve body 52 and the pressure receiving piston 51, the sliding movement of the valve body 52 and the pressure receiving piston 51 into the valve device 5 is restricted.

When the casting mold 2 is clamped, the

pins

54, 54 are pressed into the fixed mold 3 by the contact portion 41 of the movable mold 4, and the sliding movement of the valve body 52 and the pressure piston 51 is allowed.

Therefore, the

pins

54, 54 are provided in the valve device 5 so as to be slidable, similarly to the valve body 52 and the pressure receiving piston 51.

In the present embodiment, the cooling water is also blown to the exposed areas of the pins 54, and the sliding movement of the

pins

54, 54 is not hindered by the cooling of the

pins

54, 54.

As described above, the cooling structure 1 of the valve device 5 of the present embodiment has the following configuration.

(1) The cooling structure 1 of the valve device 5 includes:

a casting mold 2 in which a cavity corresponding to the shape of a cast product is formed between a fixed mold 3 (fixed-side mold) and a movable mold 4 (movable-side mold); and

and a valve device 5 provided in the fixed mold 3 for switching between communication and blocking between the cavity and a vacuum-pumping device for reducing the pressure in the cavity.

The fixed mold 3 is provided with a blowing device for blowing cooling water (cooling medium) to the valve device 5.

According to the above configuration, in the process of providing the blow-attaching device to the fixed mold 3 provided with the valve device 5 and repeatedly casting the cast product using the casting mold 2, the positional relationship between the nozzle portion 7 of the blow-attaching device and the valve device 5 does not change.

Thus, the amount of cooling water blown to the valve device 5 and the cooling water blowing range do not change during the repeated casting of a cast product using the casting mold 2, and therefore the valve device 5 can be cooled appropriately.

In addition, when the valve device 5 is provided on the movable mold 4 side, the blowing attachment device is preferably provided on the movable mold 4 side.

The cooling structure 1 of the valve device of the present embodiment has the following configuration.

(2) The blowing device has a nozzle portion 7, and the nozzle portion 7 has an ejection port 71 for cooling water.

The nozzle portion 7 is fixed to a valve holder 6 for fixing the valve device 5 to the stationary mold 3, and has an outlet port 71 directed toward the valve device 5.

An inlet port 613 of the cooling water is provided in the valve holder 6, and the inlet port 613 communicates with the outlet port 71.

According to the above configuration, the cooling water supplied through the valve holder 6 fixed to the fixed mold 3 is blown from the ejection port 71 to the valve device 5.

Thus, the cooling water blown from the outlet port 71 can be secured by the existing flow path through which the cooling water flows in the fixed mold 3, and therefore the valve device 5 can be appropriately cooled.

When the nozzle portion of the blowing device is provided separately from the casting mold 2, the direction of the nozzle needs to be periodically adjusted in order to adjust the blowing position of the cooling water. In addition, the orientation of the nozzle also needs to be adjusted when the mold is replaced.

If the nozzle unit 7 is provided in the casting mold 2, the orientation of the nozzle unit 7 is always fixed, and therefore, it is not necessary to adjust the orientation of the nozzle periodically. In addition, the time required for fine adjustment of the nozzle orientation can be shortened even when the mold is replaced.

Therefore, the time required to stop the casting for adjusting the nozzle orientation can be significantly reduced, and the casting yield of the casting mold 2 can be improved.

Further, by appropriately cooling the valve device 5, in the process of continuously casting a cast product using the casting mold 2, the time required to confirm completion of cooling of the cooling point can be shortened, and therefore, it is expected to shorten the cycle time for continuously casting a cast product using the casting mold 2.

The cooling structure 1 of the valve device 5 of the present embodiment has the following configuration.

(3) The valve device 5 is provided at a facing portion of the fixed mold 3 that faces the movable mold 4.

The discharge port 71 opens at a position separated from the parting line PL between the fixed mold 3 and the movable mold 4 in the region where the valve device 5 is provided toward the movable mold 4 in the mold opening direction of the movable mold 4.

The movable mold 4 has a contact portion 41 that contacts the bottom wall portion 60 of the valve holder 6 from the mold opening direction when the casting mold 2 is clamped.

The contact portion 41 of the movable mold 4 is inserted below the discharge port 71 of the nozzle portion 7 (on the valve device 5 side) when the casting mold 2 is closed, and seals the discharge port 71 of the nozzle portion 7.

According to the above configuration, the molten alloy injected into the cavity reaches the discharge port 71, and thus the discharge port 71 can be appropriately prevented from being clogged with the solidified molten alloy.

Further, when the seal of the abutting portion 41 to the ejection port 71 is released, the cooling water can be blown to the valve device 5, so that the cooling of the valve device 5 can be started before the opening of the movable mold 4 is completed.

This can extend the cooling time of the valve device 5, and thus the valve device 5 can be cooled more reliably.

Further, if there is no need to lengthen the cooling time of the valve device 5, the cooling time of the valve device 5 can be shortened, and it is expected that the cycle time for continuously casting a cast product using the casting mold 2 can be shortened. This is expected to improve the casting yield of the casting mold 2.

(4) The nozzle 7 of the blowing device is formed by overlapping the 1 st nozzle member 8 and the 2 nd nozzle member 9.

A communication path (slit 73) for communicating the ejection port 71 with the inflow port 613 is formed on the overlapping surface of the 1 st nozzle member 8 and the 2 nd nozzle member 9.

According to the above configuration, by providing the groove 73a (concave portion) in at least one of the 1 st nozzle member 8 and the 2 nd nozzle member 9, the slit 73 (communication path) constituting the ejection port 71 can be formed to a desired size.

The size of the slit 73 (communication path) constituting the discharge port 71 is easily changed, and therefore the amount of the cooling water blown to the valve device 5 can be appropriately adjusted.

Here, the following is considered: a part of the molten alloy injected into the cavity reaches the nozzle portion 7 and enters the spout 71, and the spout 71 is blocked by the solidified molten alloy.

In this case, since the nozzle portion 7 can be divided into the 1 st nozzle part 8 and the 2 nd nozzle part 9, the 1 st nozzle part 8 and the 2 nd nozzle part 9 can be divided to remove the molten alloy entering the inside. Thereby, even when the molten alloy reaches the nozzle portion 7 and the spout 71 is clogged with the molten alloy, the nozzle portion 7 can be easily recovered.

(5) The nozzle portion 7 is formed by overlapping the 1 st nozzle member 8 and the 2 nd nozzle member 9 in the mold opening direction of the movable mold 4.

The ejection port 71 is formed to have a width W1 in a direction perpendicular to the mold opening direction of the movable mold 4.

According to the above configuration, the cooling medium can be blown to substantially the entire surface 50a of the valve device 5 exposed on the movable mold 4 side by adjusting the width W1, and therefore the valve device 5 can be appropriately cooled.

(6) The lower end edge 7a of the nozzle portion 7 is located above the upper end edge 5a of the valve device 5 when viewed from the movable mold 4 side (see fig. 1 (b)).

The slit 73 (communication path) is inclined in such a direction that the distance between the slit and the valve device 5 in the mold opening direction of the movable mold 4 becomes closer as the region on the discharge port 71 side becomes closer to the lower end edge 7a side of the nozzle portion 7.

According to the above configuration, the cooling water can be blown to the surface 50a of the valve device 5 on the movable mold 4 side from obliquely above. Substantially the entire surface of the valve device 5 provided at the facing portion of the fixed mold 3 facing the movable mold 4 can be cooled.

(7) On a surface 50a of the valve device 5 facing the movable mold 4, sliding members (a pressure receiving piston 51, a valve body 52) that can slide in the mold opening direction of the movable mold 4 are exposed.

The ejection port 71 is provided with a groove (slit 72) along the opening direction of the movable mold 4.

The discharge port 71 and the slit 72 constitute a substantially cross-shaped discharge port for the cooling water when viewed from below the valve device 5 side.

According to the above configuration, the amount of cooling water blown from the region where the slit 72 is provided to the valve device 5 can be increased at the discharge port 71 of the nozzle portion 7.

By adjusting the set position of the slit 72, the desired position of the surface 50a of the valve device 5 can be appropriately cooled.

In particular, pins 54, 54 are provided between the pressure receiving piston 51 and the valve body 52 which are arranged in the vertical direction at the facing portion of the valve device 5 facing the movable die 4, and the

pins

54, 54 are provided at intervals in the horizontal direction when viewed from the movable die 4 side.

As described above, the discharge port 71 and the slit 72 form a generally cross-shaped discharge port for the cooling water, and the cooling water blown from the discharge port contacts not only the pressure-receiving piston 51 and the valve body 52 but also the

pins

54 and 54, whereby the cooling water can be appropriately cooled.

(8) The groove (slit 72) is provided at a position overlapping the slide member when viewed from the mold opening direction of the movable mold 4.

According to the above configuration, the amount of cooling water supplied to the region where the sliding members (the pressure receiving piston 51, the valve body 52) are exposed can be increased. This can appropriately prevent the valve device 5 from malfunctioning due to thermal expansion of the sliding member.

The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments described above. Various modifications can be made as appropriate within the scope of the technical idea of the present invention.

Claims

1. A cooling structure of a valve device, characterized by comprising:

a valve device having a valve body and a pressure-receiving piston,

the valve body is provided in one of the fixed-side mold and the movable-side mold, and switches between communication and interruption of the cavity with a vacuum extractor for reducing the pressure in the cavity,

the pressure-receiving piston is slidably movably disposed in a support hole formed in the valve device,

the one mold is provided with a blowing device for blowing a cooling medium to the valve body and the pressure receiving piston of the valve device.

2. The cooling structure of a valve device according to claim 1, wherein:

the blowing device has a nozzle portion having a discharge port for the cooling medium,

the nozzle portion is fixed to a valve holder for fixing the valve device to the one mold such that the discharge port faces the valve device,

the valve holder is provided with an inflow port for the cooling medium, and the inflow port communicates with the discharge port.

3. The cooling structure of a valve device according to claim 2, wherein:

the valve device is provided in a facing portion of the fixed-side mold facing the movable-side mold, and the discharge port opens from a parting line of the facing portion of the fixed-side mold and the movable-side mold to a position away from the movable-side mold in a mold opening direction of the movable-side mold.

4. A cooling structure of a valve device according to claim 3, wherein:

the nozzle portion is formed by overlapping the 1 st nozzle member with the 2 nd nozzle member,

a communication path for communicating the inflow port with the ejection port is formed on a surface of the 1 st nozzle member overlapping the 2 nd nozzle member.

5. The cooling structure of a valve device according to claim 4, wherein:

the nozzle portion is formed by overlapping the 1 st nozzle member and the 2 nd nozzle member in the mold opening direction of the movable mold, and the discharge port is formed to have a width in a direction orthogonal to the mold opening direction of the movable mold.

6. The cooling structure of a valve device according to claim 4 or 5, wherein:

a lower end edge of the nozzle portion is located above an upper end edge of the valve device when viewed from the movable mold side,

the communication path is inclined in such a direction that a distance between the communication path and the valve device in the mold opening direction of the movable mold becomes closer as a region of the discharge port side is closer to a lower end edge side of the nozzle portion.

7. The cooling structure of a valve device according to claim 4 or 5, wherein:

a sliding member that is slidably movable in an opening direction of the movable-side mold is exposed at a portion of the valve device that faces the movable-side mold,

the discharge port is provided with a groove along the mold opening direction of the movable-side mold.

8. The cooling structure of a valve device according to claim 6, wherein:

the discharge port is provided with a groove along the mold opening direction of the movable mold.

9. The cooling structure of a valve device according to claim 7, wherein:

the groove is provided at a position overlapping the slide member when viewed from a mold opening direction of the movable mold.

10. The cooling structure of a valve device according to claim 8, wherein: