Vacuum die casting equipment

Abstract

The vacuum die-casting apparatus comprises a mold having a cavity, and a vacuum valve apparatus (100) having a valve (200) for opening and closing a vacuum suction circuit (170) that vacuum-suctions gas from within the cavity. The vacuum valve apparatus (100) comprises a fixed body (110) that is fixedly positioned, a valve closing solenoid valve (320) attached to the fixed body (110) that opens and closes an air passage (331) for valve closing air (V1) that moves the valve (200) to close the vacuum suction circuit (170), and a coil protection cooling water passage (119) provided in the fixed body (110) near the valve closing solenoid valve (320) through which cooling water is passed. The valve closing solenoid valve (320) comprises a coil (322), a coil protection cooling water passage (341) located near the coil (322) through which cooling water is passed, and a coil protection cooling reinforcement copper rod (342).

Description

Technical Field

[0001] The present invention relates to a vacuum die casting device.

Background Art

[0002] Patent Document 1 discloses a die casting device including a mold, a sleeve, an injection device, a vacuum device, and a control unit. The mold has a valve for opening and closing vacuum suction and a valve device for driving the valve by air.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a vacuum die casting device, while making the device compact and inexpensive, it is necessary to increase the productivity of the device, and there has been a demand for a vacuum die casting device that can satisfy both of these requirements.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a vacuum die casting device that is compact, inexpensive, has a high operating speed, and high productivity.

Means for Solving the Problems

[0006] To achieve the above object, a vacuum die casting device according to the present invention In a vacuum die casting device, a mold having a cavity, a vacuum valve device including a valve for opening and closing a vacuum suction passage for vacuum-sucking gas in the cavity, The vacuum valve device has a fixed main body fixedly arranged, A solenoid valve attached to the aforementioned fixed body opens and closes an air passage for air that moves the valve in order to close the vacuum suction passage. Solenoid valve device having and, The fixed body includes a first cooling water passage through which cooling water is passed, provided between the solenoid valve and the vacuum suction passage connected to the vacuum valve device, which is not accessible to molten metal, The solenoid valve Device teeth, The solenoid valve includes, A coil that generates electromagnetic force, before A second cooling water passage is provided in the solenoid valve case, which is the case of the solenoid valve, and through which cooling water is passed. The device comprises a copper or copper alloy rod disposed within the second cooling water passage, It is characterized by the following:

[0007] The valve is equipped with a disc-shaped valve ring, Three air passages and three solenoid valves are provided. Each of the three air passages is curved with a curvature of 7 mm ± 0.3 mm on the outer diameter side of the curved portion and opens circumferentially spaced apart toward the valve ring. The air is made to collide with the valve ring at the speed of sound, and the valve is closed by the impact load. It would be acceptable to do so. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a vacuum die-casting apparatus that is compact, inexpensive, operates at a high speed, and has high productivity. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic cross-sectional view showing a vacuum die-casting apparatus according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view showing a vacuum valve device according to an embodiment of the present invention. [Figure 3]It is a plan view showing a movable type and its peripheral part according to an embodiment of the present invention. [Figure 4] It is a cross-sectional view showing a valve according to an embodiment of the present invention. [Figure 5] It is a cross-sectional view showing a closed solenoid valve according to an embodiment of the present invention. [Figure 6] It is a partially enlarged cross-sectional view showing a valve closing solenoid valve, an air passage, and its peripheral part according to an embodiment of the present invention. [Figure 7] It is a partially enlarged cross-sectional view showing an air passage, a closed ejection air hole, and its peripheral part according to an embodiment of the present invention. [Figure 8] It is a cross-sectional view showing a vacuum valve device during vacuum suction according to an embodiment of the present invention. [Figure 9] It is a cross-sectional view showing a vacuum valve device immediately after completion of filling according to an embodiment of the present invention. [Figure 10] It is a cross-sectional view showing a vacuum valve device immediately after mold opening according to an embodiment of the present invention. [Figure 11] It is a cross-sectional view showing a vacuum valve device immediately after mold clamping according to an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, specific embodiments of a vacuum die-casting device according to the present invention will be described with reference to the accompanying drawings. Note that the present invention is not limited by the following embodiments. In the following description, the left side in FIG. 1 (the movable mold 12 in the mold 10) is taken as the front part (front), and the right side (the fixed mold 11 in the mold 10) is taken as the rear part (rear).

[0011] As shown in FIG. 1, the vacuum die-casting device 1 includes a mold 10, a sleeve 20, an injection device 30, and a control unit 60.

[0012] As shown in FIG. 1, the mold 10 includes a fixed mold 11, a movable mold 12, and a vacuum valve device 100.

[0013] The fixed mold 11 and the movable mold 12 are made of a metal such as steel. The fixed mold 11 is fixed in position, while the movable mold 12 is movable in the front-rear direction. The movable mold 12 is moved by a mold moving device (not shown) and is clamped or opened with the fixed mold 11. A cavity 50 is provided between the fixed mold 11 and the movable mold 12, which is a space into which molten metal M flows and is cast into the product.

[0014] Between the fixed mold 11 and the movable mold 12, a molten metal passage 13 is provided, communicating between the sleeve 20 and the cavity 50. Additionally, a cavity vacuum suction passage 14 is provided, communicating between the cavity 50 and the vacuum valve device 100. Both the molten metal passage 13 and the cavity vacuum suction passage 14 are passages through which the molten metal M is delivered.

[0015] The sleeve 20 is formed in a cylindrical shape from a metal such as steel and contains molten metal M. The sleeve 20 extends horizontally (in the front-to-back direction in the example of Figure 1), and one end is attached to the mold 10. A pouring port 21 opening upwards is provided on the circumferential surface of the sleeve 20. The molten metal M is poured into the sleeve 20 through the pouring port 21.

[0016] The injection device 30 injects the molten metal M in the sleeve 20 into the cavity 50 of the mold 10. The injection device 30 comprises a tip 31, a rod 32, and an injection drive unit 33.

[0017] The tip 31 is formed in a roughly cylindrical shape and is positioned inside the sleeve 20. The tip of the rod 32 is connected to the rear surface of the tip 31, and the rear end of the rod 32 is connected to the injection drive unit 33. The injection device 30 moves the molten metal M injected into the sleeve 20 toward the mold 10 using the tip 31 and injects it. This fills the cavity 50 with molten metal M through the molten metal passage 13.

[0018] The control unit 60 includes a CPU (Central Processing Unit), RAM (Random-Access Memory), etc., and controls the operation of each part of the vacuum die-casting apparatus 1. It may also be equipped with input means such as a keyboard and mouse, display means such as a display, etc., in any configuration.

[0019] The vacuum valve device 100 is mounted on the top of the mold 10. As shown in Figure 2, the vacuum valve device 100 comprises a fixed body 110, a movable body 120, a valve 200, and a solenoid valve device 300.

[0020] The fixed body 110 and the movable body 120 are made of a metal such as steel. The fixed body 110 is attached to the upper part of the fixed mold 11 of the mold 10. A cylindrical valve bush 118 extending in the front-rear direction is arranged on the fixed body 110. The inside of the valve bush 118, the hole in the fixed body 110, and the flange portion housing space 113 provide a space in which the valve 200 can move in the front-rear direction. The valve bush 118, the hole in the fixed body 110, and the flange portion housing space 113 are continuous from front to rear.

[0021] The rear end of the fixed body 110 is provided with an opening 114 that is slightly larger than the outer diameter of the AX nut 250 at the rear end of the valve 200. A fixed body plate 115 is attached to the rear end of the fixed body 110 so as to cover the opening 114. The fixed body plate 115 is provided with a recess 116 for accommodating the rear end of the valve 200, and a closing hole 117 that connects the center of the bottom of the recess 116 to the outside. The range of movement of the valve 200 is from the position in Figure 2 where the front of the valve ring 240 abuts against the fixed body 110, to the position where the rear of the valve ring 240 abuts against the fixed body plate 115.

[0022] The movable body 120 is attached to the upper part of the movable mold 12. The movable body 120 is movable in the front-rear direction relative to the fixed body 110 as the movable mold 12 moves. A vacuum suction circuit 170, which is a passage for sucking gas G in the cavity 50, is provided between the fixed body 110 and the movable body 120, and on the fixed body 110. As shown in Figures 2 and 3, the vacuum suction circuit 170 includes a vacuum suction groove 171, a vacuum suction bypass 172, a valve vacuum suction passage 173, and a vacuum suction passage 174.

[0023] The vacuum suction groove 171 is located at the lower end of the vacuum suction circuit 170 and communicates with the cavity vacuum suction passage 14 of the mold 10. Referring to Figure 3, the cavity vacuum suction passage 14 comprises a cavity vacuum suction gate 14a, a cavity vacuum suction lateral groove 14b, and a cavity vacuum suction groove 14c.

[0024] The two cavity vacuum suction gates 14a each extend vertically, communicating with the upper part of the cavity. The cavity vacuum suction lateral groove 14b extends horizontally, communicating with the upper end of the cavity vacuum suction gate 14a. The cavity vacuum suction groove 14c extends vertically, communicating with the central part of the cavity vacuum suction lateral groove 14b and the lower end of the vacuum suction groove 171.

[0025] The vacuum suction bypass circuit 172 communicates with the upper end of the vacuum suction groove 171 and is formed to surround the longitudinal central axis of the valve 200 in a roughly rectangular shape. The vacuum suction bypass circuit 172 is a combination of grooves formed in the fixed body 110 and the movable body 120.

[0026] The valve vacuum suction passage 173 communicates with one point on the upper part of the vacuum suction bypass 172 at its front. The valve vacuum suction passage 173 is also formed towards the rear in the gap between the inside of the valve bush 118 and the first body portion 221 of the valve 200. In Figure 2, the valve vacuum suction passage 173 is open, but it is closed by the movement of the valve 200 as described later.

[0027] The vacuum suction passage 174 is connected to the rear end when the valve vacuum suction passage 173 is open. The vacuum suction passage 174 extends radially through the valve bush 118 and is formed in the fixed body 110 and the vacuum suction pipe 175 extending upward from the fixed body 110.

[0028] A vacuum suction solenoid valve 176, which opens and closes the vacuum suction passage 174, is located in the middle of the vacuum suction pipe 175. A vacuum tank 177 (and a vacuum pump, not shown), which is a vacuum device for sucking gas G from inside the cavity 50, is connected to the end of the vacuum suction pipe 175.

[0029] Furthermore, the fixed body 110 is provided with a coil protection cooling water passage 119, which is a hole for flowing cooling water. The coil protection cooling water passage 119 is located between the vacuum suction passage 174 and the valve closing solenoid valve 320 of the solenoid valve device 300. The coil protection cooling water passage 119 can be provided as multiple holes; in the example in Figure 2, two are provided.

[0030] Furthermore, the fixed body 110 includes a solenoid valve 180 for ejecting valve-opening air V2 to push the valve 200 from the rear, an air passage connection part 182, and an air pipe 183.

[0031] The air passage connection portion 182 is attached to the rear end face of the fixed main body plate 115. The air passage 181 is formed by the hole in the air passage connection portion 182 and the air pipe 183 extending upward from the air passage connection portion 182. A solenoid valve 180 is connected to the end of the air pipe 183. The solenoid valve 180 opens and closes the air passage 181 for valve-open air V2 supplied from an air source (not shown).

[0032] The valve 200 is axially movable and opens and closes the valve vacuum suction passage 173 of the vacuum suction circuit 170. As shown in Figures 2 and 4, the valve 200 comprises a head 210, a first body 221, a second body 222, and a valve pin 230, all integrally formed from front to back. The combination of these parts is formed in a stepped cylindrical shape.

[0033] The outer diameter of the head 210 is slightly smaller than the inner diameter of the valve bush 118. The outer diameter of the first body 221 is smaller than the outer diameter of the head 210, thereby forming the valve vacuum suction passage 173. The outer diameter of the second body 222 is slightly smaller than the inner diameter of the valve bush 118. The outer diameter of the third body 223 is smaller than the outer diameter of the second body 222, and the outer diameter of the valve pin 230 is even smaller. A threaded portion 231 is formed on the valve pin 230.

[0034] An annular groove 224 is provided on the outer circumference of the second body 222, and a sealing member 225 that seals the gap with the valve bush 118 is housed in the groove 224. An annular groove 226 is provided on the outer circumference of the third body 223, and a sealing member 227 that seals the gap with the valve ring 240 is housed in the groove 226.

[0035] Furthermore, the valve 200 is equipped with a valve ring 240 and an AX nut 250.

[0036] The valve ring 240 is formed in the shape of a hollow disc, with an outer diameter slightly smaller than the inner diameter of the fixed body 110 and an inner diameter of hole 241 slightly larger than the outer diameter of the third body 223. The valve ring 240 is fitted onto the third body 223 and fixed axially with an AX nut 250.

[0037] An annular groove 242 is provided on the outer circumference of the valve ring 240, and a sealing member 243 that seals the gap with the fixed body 110 is housed in the groove 242. The sealing members 225, 227, and 243 are, for example, O-rings. In addition to what is described here, combinations of grooves and sealing members of similar shapes are used in various parts of the vacuum valve device 100 shown in Figure 2, etc.

[0038] The solenoid valve device 300 moves the valve 200 using valve closing air V1 or valve opening air V2 to open and close the valve vacuum suction passage 173 for the gas G drawn in from the cavity 50. The solenoid valve device 300 is positioned on the rear end of the fixed body 110.

[0039] As shown in Figure 5, the solenoid valve device 300 comprises a solenoid valve body 311, a solenoid valve case 312, and a valve closing solenoid valve 320.

[0040] The solenoid valve body 311 and the solenoid valve case 312 are combined to house the valve closing solenoid valve 320 inside. An insulating sealant 313 is sandwiched between the joint surfaces of the solenoid valve body 311 and the solenoid valve case 312.

[0041] An air passage 331 is formed by a hole in the solenoid valve body 311 and an air pipe 314 extending upward from the solenoid valve body 311. A solenoid valve 332 is connected to the end of the air pipe 314. The solenoid valve 332 opens and closes the air passage 331 for valve closing air V1 supplied from an air source (not shown).

[0042] The valve closing solenoid valve 320 comprises a solenoid valve body 311, a solenoid valve case 325, a seal valve 321, a coil 322, and a power connector 323.

[0043] The solenoid valve body 311 is made of an aluminum alloy having high thermal conductivity. The solenoid valve case 325 is a housing that houses the seal valve 321 and the coil 322.

[0044] The seal valve 321 is a valve body that opens and closes the air passage 331 at the lower end of the air passage 331. In Figure 5, the seal valve 321 is biased forward by a biasing part (not shown), and the air passage 331 is closed.

[0045] The coil 322 is made of an aluminum alloy with high thermal conductivity. When current is applied, the coil 322 generates an electromagnetic force, which attracts the portion of the seal valve 321 that extends to the rear, causing the seal valve 321 to move backward. When current is applied to the coil 322, the air passage 331 is opened and communicates with the air passage 333 located at the bottom of the solenoid valve body 311.

[0046] The air passage 333 communicates with the air passage 150 of the fixed body 110. The power connector 323 is connected to a power supply unit (not shown) in the vacuum die casting apparatus 1 for energizing the coil 322. As a result, the control unit 60 of the vacuum die casting apparatus 1 controls the operation of the valve closing solenoid valve 320.

[0047] Furthermore, the solenoid valve device 300 includes a coil protection cooling water passage 341 and a coil protection cooling reinforcement copper rod 342.

[0048] The coil protection cooling water passage 341 is formed as a hole in the solenoid valve case 312 near the upper side of the coil 322. The coil protection cooling reinforcement copper rod 342 is a rod made of copper or a copper alloy that is positioned inside the coil protection cooling water passage 341. The cooling water flowing through the coil protection cooling water passage 341 cools the energized coil 322 to a temperature of, for example, 50°C or lower.

[0049] Next, the valve closing air V1 passage will be described in more detail with reference to Figures 6 and 7.

[0050] As shown in Figure 6, when viewed from rear to front, the air passage 331 branches into three, and three valve-closing solenoid valves 320 (320a, 320b, 320c) are connected to each branch.

[0051] The outlets of the valve-closing solenoid valves 320 (320a, 320b, 320c) are connected in the order of air passage 333 (333a, 333b, 333c) and air passage 150 (150a, 150b, 150c). The outlet of air passage 150 (150a, 150b, 150c) is the closed discharge air hole 151 (151a, 151b, 151c).

[0052] The valve closing solenoid valve 320a, air passage 333a, air passage 150a, and closed ejection air hole 151a, and the valve closing solenoid valve 320c, air passage 333c, air passage 150c, and closed ejection air hole 151c are arranged symmetrically when viewed as shown in Figure 6.

[0053] The three closed air outlet holes 151 are spaced apart circumferentially from the valve ring 240. In the example shown in Figure 6, the closed air outlet holes 151 are arranged at 90° intervals, two horizontally and one upwards.

[0054] As shown in Figure 7, the three air passages 150 each extend vertically and then curve before reaching the valve ring 240. Furthermore, at the end of the curve, the three air passages 150 open from the fixed body 110 at a closed air outlet hole 151 toward the valve ring 240. The curved portions of the three air passages 150 are formed with a curvature of 7 mm ± 0.3 mm on the outer diameter side of the curve. The radius of 7 mm ± 0.3 mm was determined considering the minimization of the structure around the air passages 150. The inner diameter of the air passages 150 is, for example, 3.6 mm. The valve closing air V1 flows into the flange housing space 113 from the closed air outlet hole 151, pushing the valve ring 240 backward.

[0055] Next, the operation of the vacuum valve device 100 will be explained with reference to Figures 8 to 11.

[0056] Figure 8 shows the operation of the vacuum valve device 100 when the vacuum die-casting apparatus 1 sucks gas G from the cavity 50. The valve 200 has been moved forward in advance, which opens the valve vacuum suction passage 173 of the vacuum suction circuit 170.

[0057] In this state, when the control unit 60 of the vacuum die-casting apparatus 1 outputs a vacuum suction signal to the vacuum valve device 100, the vacuum suction solenoid valve 176 opens, and the vacuum tank 177 sucks in the gas G. The gas G in the cavity 50 passes through the cavity vacuum suction passage 14 of the mold 10, the vacuum suction groove 171 of the vacuum valve device 100, the vacuum suction bypass 172, the valve vacuum suction passage 173, and the vacuum suction passage 174, and is sucked into the vacuum tank 177.

[0058] Furthermore, the output of the vacuum suction signal causes the solenoid valve 332 to open and eject valve-closing air V1 from the air source into the air passage 331. However, the valve-closing air V1 ejected from the solenoid valve 332 is sealed by the seal valve 321 of the valve-closing solenoid valve 320 and does not eject into the air passage 333.

[0059] Figure 9 shows the operation of the vacuum valve device 100 immediately after the filling of the cavity 50 with molten metal M is complete. The solenoid valve 332 is already open, and the coil 322 of the valve closing solenoid valve 320 is not energized. Therefore, the valve closing air V1 is sealed by the seal valve 321.

[0060] In this state, when the control unit 60 of the vacuum die-casting apparatus 1 outputs a valve closing signal to the vacuum valve apparatus 100, the coil 322 of the valve closing solenoid valve 320 is energized. When the coil 322 is energized, the seal valve 321, which is attracted to the coil 322, moves to the right. As a result, the air passage 331 opens, and the valve closing air V1 collides with the valve ring 240 at the speed of sound from the air passages 331 and 333.

[0061] As a result, the impact load of the valve closing air V1 causes the valve 200 to move to the right. When the valve 200 moves, the static friction resistance changes to dynamic friction resistance, and the valve ring 240 of the valve 200 comes into contact with the fixed body plate 115 at high speed. This causes the valve 200 to close the valve vacuum suction passage 173 at high speed. Because the valve 200 moves at high speed, the valve vacuum suction passage 173 is closed before the molten metal M reaches the valve 200. As a result, the molten metal M that has flowed into the vacuum suction groove 171 and vacuum suction bypass 172 in the vacuum valve device 100 is blocked by the head 210 of the valve 200.

[0062] Subsequently, when the control unit 60 of the vacuum die-casting apparatus 1 outputs a suction stop signal to the vacuum valve device 100, the vacuum tank 177 stops suction in the vacuum suction passage 174.

[0063] During the above operation, cooling water is passed through the coil protection cooling water passage 119 at any time. The cooling water cools the fixed body 110, which reduces heat conduction from the molten metal M to the valve closing solenoid valve 320.

[0064] Figure 10 shows the operation of the vacuum valve device 100 immediately after the mold 10 is opened. In this operation, the air passage 331 is opened in advance by the valve closing solenoid valve 320.

[0065] In this state, when the control unit 60 of the vacuum die-casting apparatus 1 outputs a valve open signal to the vacuum valve device 100, the solenoid valve 332 opens and relieves the pressure in the air passages 331 and 333. Subsequently, the solenoid valve 180 opens and the valve-opening air V2 is ejected from an external air source into the air passage 181. The pressure of the valve-opening air V2 moves the valve 200 to the left, and the valve vacuum suction passage 173 opens.

[0066] Figure 11 shows the operation of the vacuum valve device 100 immediately after the mold 10 is clamped. When the control unit 60 of the vacuum die-casting apparatus 1 outputs a clamping completion signal to the vacuum valve device 100, the solenoid valve 180 opens to release pressure from the air passage 181. Subsequently, when the control unit 60 cuts off the power to the coil 322, the seal valve 321 moves to the left due to its biasing force, closing the air passage 331.

[0067] Conventional configurations require complexity and size, including a mechanism for moving the valve for vacuum suction with air. Therefore, it has been difficult to make the solenoid valve device compact and inexpensive. In contrast, the configuration of this embodiment provides a coil protection cooling water passage 119 in the fixed body 110 of the vacuum valve device 100. Furthermore, the solenoid valve case 312 of the solenoid valve device 300 is provided with a coil protection cooling water passage 341 and a coil protection cooling reinforcement copper rod 342 having high thermal conductivity. This allows for miniaturization of the vacuum valve device 100 and the solenoid valve device 300, resulting in a compact and inexpensive vacuum die-casting device 1.

[0068] Furthermore, in conventional configurations, when closing the valve, the valve closing air passage that moves the valve extended vertically before changing direction by 90°. This reduced the velocity of the valve closing air, decreasing the impact load and potentially slowing down the valve closing speed. In contrast, the configuration of this embodiment uses three valve closing solenoid valves 320 and three air passages 150, with each air passage 150 curved with a radius of 7 mm ± 0.3 mm. Then, valve closing air V1 is sent from the closing air outlet hole 151 to collide with the valve ring 240 at the speed of sound, closing the valve with an impact load. This increases the operating speed of the valve 200 closing the valve vacuum suction passage 173. In one example of the above embodiment, the closing time of the valve closing solenoid valve 320 was 0.005 s, and the closing time of the solenoid valve device 300 was 0.008 s, which were sufficiently fast results.

[0069] Therefore, for the reasons explained above, the configuration of this embodiment makes it possible to increase the productivity of the vacuum die casting apparatus 1.

[0070] Furthermore, this invention is not limited to the embodiments described above, and various modifications and applications are possible.

[0071] The configuration of the vacuum die-casting apparatus 1 may differ from that shown in Figure 1.

[0072] The arrangement and distances of the various parts, including the solenoid valve device 300, are not limited to those shown in the illustration.

[0073] This invention allows for various embodiments and modifications without departing from the broad spirit and scope of the invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the invention. In other words, the scope of the invention is indicated not by the embodiments, but by the claims. Various modifications made within the scope of the claims and the equivalent scope of the meaning of the invention are considered to be within the scope of this invention.

[0074] (Note) (Note 1) In a vacuum die-casting apparatus, A mold with a cavity, The system includes a vacuum valve device equipped with a valve for opening and closing a vacuum suction passage that vacuum-suctions the gas in the cavity, The vacuum valve device is A fixed body that is positioned in a fixed location, A solenoid valve attached to the aforementioned fixed body opens and closes an air passage for air that moves the valve in order to close the vacuum suction passage, The fixed body includes a first cooling water passage provided near the solenoid valve through which cooling water is passed, The solenoid valve is A coil that generates electromagnetic force, A second cooling water passage is provided near the coil through which cooling water flows, The device comprises a copper or copper alloy rod disposed within the second cooling water passage, A vacuum die-casting apparatus characterized by the following features.

[0075] (Note 2) The valve is equipped with a disc-shaped valve ring, Three air passages and three solenoid valves are provided. Each of the three air passages is curved with a curvature of 7 mm ± 0.3 mm on the outer diameter side of the curved portion and opens circumferentially spaced apart toward the valve ring. The air is made to collide with the valve ring at the speed of sound, and the valve is closed by the impact load. The vacuum die-casting apparatus described in Appendix 1, characterized by the features described herein. [Industrial applicability]

[0076] The present invention can be suitably employed in a vacuum die-casting apparatus that casts products by injecting molten metal into a cavity. [Explanation of Symbols]

[0077] 1 Vacuum die casting apparatus, 10 Mold, 11 Fixed mold, 12 Movable mold, 13 Molten metal passage, 14 Cavity vacuum suction passage, 14a Cavity vacuum suction gate, 14b Cavity vacuum suction lateral groove, 14c Cavity vacuum suction groove, 20 Sleeve, 21 Pouring port, 30 Injection device, 31 Tip, 32 Rod, 33 Injection drive unit, 50 Cavity, 60 Control unit, 100 Vacuum valve device, 110 Fixed body, 113 Flange housing space, 114 Opening, 115 Fixed body plate, 116 Recess, 117 Closure hole, 118 Valve bush, 119 Coil protection cooling water passage, 120 Movable body, 150, 150a, 150b, 150c Air passage, 151, 151a, 151b, 151c Closed air outlet hole, 170 Vacuum suction circuit, 171 Vacuum suction groove, 172 Vacuum suction bypass circuit, 173 Valve vacuum suction passage, 174 Vacuum suction passage, 175 Vacuum suction pipe, 176 Vacuum suction solenoid valve, 177 Vacuum tank, 180 Solenoid valve, 181 Air passage, 182 Air passage connection, 183 Air pipe, 200 Valve, 210 Head, 221 First body, 222 Second body, 223 Third body, 224 Groove, 225 Seal member, 226 Groove, 227 Seal member, 230 Valve pin, 231 Threaded part, 240 Valve ring, 241 Hole, 242 Groove, 243 Seal member, 250 AX nut, 300 Solenoid valve device, 311 Solenoid valve body, 312 Solenoid valve case, 313 Insulation sealant, 314 Air pipe, 320, 320a, 320b, 320c Valve closing solenoid valve, 321 Seal valve, 322 Coil, 323 Power connector, 325 Solenoid valve case, 331 Air passage, 332 Solenoid valve, 333, 333a, 333b, 333c Air passage, 341 Coil protection cooling water passage, 342 Coil protection cooling reinforcement copper rod, G Gas, M Molten metal, V1 Valve closing air, V2 Valve opening air.

Claims

1. In a vacuum die-casting apparatus, A mold with a cavity, The system includes a vacuum valve device equipped with a valve for opening and closing a vacuum suction passage that vacuum-suctions the gas in the cavity, The vacuum valve device is A fixed body that is positioned in a fixed location, A solenoid valve device having a solenoid valve attached to the fixed body and having a solenoid valve that opens and closes an air passage for air that moves the valve to close the vacuum suction passage, The fixed body includes a first cooling water passage through which cooling water is passed, provided between the solenoid valve and the vacuum suction passage connected to the vacuum valve device, which is not accessible to molten metal, The solenoid valve device is, The solenoid valve includes a coil that generates an electromagnetic force, A second cooling water passage is provided in the solenoid valve case, which is the case of the solenoid valve, through which cooling water is passed, The device comprises a copper or copper alloy rod disposed within the second cooling water passage, A vacuum die-casting apparatus characterized by the following features.

2. The valve is equipped with a disc-shaped valve ring, Three air passages and three solenoid valves are provided. Each of the three air passages is curved with a curvature of 7 mm ± 0.3 mm on the outer diameter side of the curved portion and opens circumferentially spaced apart toward the valve ring. The air is made to collide with the valve ring at the speed of sound, and the valve is closed by the impact load. The vacuum die-casting apparatus according to feature 1.

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