Mold for a molding machine and molding machine

Abstract

The molding machine mold of the present embodiment has: a main body portion having a molding surface and a support surface opposite the molding surface; and a partial pressure device assembled to at least a portion of the main body portion, the partial pressure device including: a pressure pin having one end exposed from the molding surface side of the main body portion; an actuator provided on the support surface side of the main body portion and driving the pressure pin; a pressure decay member provided so as to surround the pressure pin between the pressure pin and the main body portion, with one end exposed from the molding surface side of the main body portion; and an elastic body provided between the pressure decay member and the support surface.

Description

Technical Field

[0001] This invention relates to a mold and a molding machine for manufacturing molded articles by filling a cavity in a mold with molten liquid using an injection device. Background Technology

[0002] Die casting machines, as an example of molding machines, manufacture molded products (die castings) by filling molten metal into the cavity (mold) of a mold, which is closed by a mold clamping device, using an injection device. In die casting machines, in particular to cope with the increasing size or thinner walls of molded products, it is required to fill the cavity of the mold with molten metal in a short time.

[0003] To fill the molten metal quickly, the injection speed of the injection device needs to be increased. However, increasing the injection speed can lead to the problem of burrs being blown out due to the pulse pressure generated in the molten metal by the inertial force of the injection plunger. Therefore, it is desirable to reduce the pulse pressure.

[0004] In addition, to improve the quality of molded products, it is desirable to suppress shrinkage cavities inside the molded products. One method to suppress shrinkage cavities is, for example, a localized pressure method in which a pressure pin provided on the mold is pressed into the molded product after the molten metal begins to solidify in the mold.

[0005] Patent Document 1 describes a pressure attenuation device that uses a spring to attenuate the pulse pressure generated in the molten metal. Patent Document 2 describes a localized pressure device that uses the force of a spring to press a pressure pin into a molded article.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Publication No. 59-2580

[0009] Patent Document 2: Japanese Utility Model Application Publication No. 2-81748 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] The problem to be solved by the present invention is to provide a mold for a molding machine and a molding machine having a local pressure device that can reduce pulse pressure.

[0012] Problem-solving methods

[0013] According to one aspect of the present invention, a molding die for a molding machine comprises: a main body having a molding surface and a support surface facing the molding surface; and a partial pressurizing device, at least a portion of which is assembled to the main body, the partial pressurizing device comprising: a pressurizing pin, one end of which protrudes from the molding surface side of the main body; an actuator disposed on the support surface side of the main body for driving the pressurizing pin; a pressure attenuation member disposed between the pressurizing pin and the main body, surrounding the pressurizing pin, one end of which protrudes from the molding surface side of the main body; and an elastomer disposed between the pressure attenuation member and the support surface.

[0014] In the molding die of the molding machine described above, it is preferable that the local pressure device further includes an annular first sealing member provided between the pressure attenuation member and the main body to surround the pressure attenuation member.

[0015] In the mold for the molding machine described above, the first sealing component preferably contains cast iron or steel.

[0016] In the molding die of the molding machine described above, it is preferable that the local pressure device further includes an annular second sealing member disposed between the pressure pin and the pressure attenuation member, surrounding the pressure pin.

[0017] In the molding die of the molding machine described above, it is preferable that the pressure pin has an annular protrusion that can contact the other end of the pressure attenuation component.

[0018] In the molding die of the molding machine described above, it is preferable to also include a position sensor that monitors the position of the pressure pin.

[0019] In the mold for the molding machine described above, the elastomer is preferably a disc spring.

[0020] In the mold for the molding machine described above, it is preferable that when the pressure pin is at the retraction limit, one end of the pressure pin is located at a position that is flush with or protrudes from the molding surface side of the pressure attenuation component when the pressure attenuation component is at the forward limit.

[0021] In the molding die of the molding machine described above, it is preferable that the end of the pressure pin when the pressure pin is at the retraction limit is located on the support surface side, compared to the end of the pressure attenuation member when the pressure attenuation member is at the forward limit.

[0022] One aspect of the molding machine of the present invention includes a mold for molding machines as described above.

[0023] The effects of the invention

[0024] According to the present invention, a mold for a molding machine and a molding machine having a local pressure device capable of reducing pulse pressure can be provided. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the overall structure of the molding machine according to the first embodiment.

[0026] Figure 2 This is a schematic cross-sectional view of the mold for the molding machine according to the first embodiment.

[0027] Figure 3 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0028] Figure 4 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0029] Figure 5 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0030] Figure 6 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0031] Figure 7 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0032] Figure 8 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0033] Figure 9 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0034] Figure 10 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0035] Figure 11 This is a graph illustrating an example of the operation of the molding machine according to the first embodiment.

[0036] Figure 12 This is a schematic cross-sectional view of the mold for the molding machine according to the second embodiment.

[0037] Figure 13 This is a schematic cross-sectional view of the mold for the molding machine according to the second embodiment.

[0038] Figure 14 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0039] Figure 15 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0040] Figure 16 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0041] Figure 17 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0042] Figure 18 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0043] Figure 19 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0044] Figure 20 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0045] Figure 21 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment. Detailed Implementation

[0046] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0047] Furthermore, in this specification, hydraulic pressure is used as an example of hydraulic systems. For example, a hydraulic circuit is used as an example of a hydraulic circuit, a hydraulic actuator is used as an example of a hydraulic actuator, and a hydraulic device is used as an example of a hydraulic system. For example, water pressure can be used instead of oil pressure. Additionally, working oil is used as an example of a working fluid in this specification.

[0048] (First Embodiment)

[0049] The molding die of the first embodiment includes: a main body having a molding surface and a support surface facing the molding surface; and a partial pressurizing device, at least a portion of which is assembled in the main body. The partial pressurizing device includes: a pressurizing pin, one end of which protrudes from the molding surface side of the main body; an actuator disposed on the molding surface side of the main body to drive the pressurizing pin; a pressure attenuation member disposed between the pressurizing pin and the main body, surrounding the pressurizing pin, one end of which protrudes from the molding surface side of the main body; and an elastic body disposed between the pressure attenuation member and the support surface. In the molding die of the first embodiment, when the pressurizing pin is at its retraction limit, one end of the pressurizing pin is flush with or protrudes from the pressure attenuation member when the pressure attenuation member is at its forward limit.

[0050] Furthermore, the molding machine of the first embodiment includes a molding machine mold with the above-described structure.

[0051] Figure 1 This is a schematic diagram showing the overall structure of the molding machine according to the first embodiment. Figure 1This is a partial side view including a cross-sectional view. The molding machine in the first embodiment is a die-casting machine 100. The die-casting machine 100 is a cold chamber type die-casting machine.

[0052] The die-casting machine 100 includes a mold closing device 10, an ejection device 12, an injection device 14, a mold 18, a control unit 20, a base 22, a fixed template 24, a movable template 26, a connecting rod housing 28, and a tie rod 30.

[0053] Die-casting machine 100 is operated by injecting material into the interior of mold 18. Figure 1 A machine for manufacturing die-cast parts by injecting and filling a cavity (Ca) with molten metal, allowing the molten metal to solidify within the mold (18). The metal can be, for example, aluminum, aluminum alloys, zinc alloys, or magnesium alloys.

[0054] The mold 18 includes a fixed mold 18a and a movable mold 18b. The mold 18 is disposed between the mold closing device 10 and the injection device 14.

[0055] The fixed mold 18a has a main body 40 and a local pressure device 50. The fixed mold 18a is an example of a mold for a molding machine according to the first embodiment.

[0056] The fixed template 24 is fixed to the base 22. The fixed template 24 can hold the fixed mold 18a.

[0057] The movable template 26 is movably mounted on the base 22 in the mold opening and closing direction. The mold opening and closing direction refers to... Figure 1 The two directions shown are the mold opening direction and the mold closing direction. The movable mold plate 26 can hold the movable mold 18b opposite to the fixed mold 18a.

[0058] The connecting rod housing 28 is mounted on the base 22. One end of the connecting rod mechanism constituting the mold clamping device 10 is fixed to the connecting rod housing 28.

[0059] The fixed template 24 and the connecting rod housing 28 are fixed by the tie rod 30. The tie rod 30 supports the closing force during the application of the closing force to the fixed mold 18a and the movable mold 18b.

[0060] The mold closing device 10 has the function of opening and closing the mold 18 and closing the mold. The injection device 14 has the function of injecting molten liquid into the cavity Ca of the mold 18, filling the cavity Ca of the mold 18 with molten liquid, and pressurizing the molten liquid. The ejection device 12 has the function of ejecting the manufactured die-cast part from the mold 18.

[0061] The control unit 20 includes a control device 32, an input device 34, and a display device 36. The control unit 20 has the function of controlling the molding operation of the die-casting machine 100 using the mold clamping device 10, the ejection device 12, the injection device 14, and the local pressure device 50.

[0062] The input device 34 accepts input from the operator. The operator can use the input device 34 to set the molding conditions of the die-casting machine 100, etc. The input device 34 is, for example, a touch panel of an LCD or OLED display.

[0063] The display device 36 displays, for example, the molding conditions and operating status of the die-casting machine 100 on a screen. The display device 36 is, for example, a liquid crystal display or an organic EL display.

[0064] The control device 32 has the function of performing various calculations and outputting control commands to various parts of the die-casting machine 100. For example, the control device 32 has the function of storing molding conditions. For example, the control device 32 controls the operation of the injection device 14. For example, the control device 32 controls the operation of the local pressure device 50 based on the state of filling the cavity Ca of the mold 18 with molten metal.

[0065] The control device 32 may be composed of a combination of hardware and software. The control device 32 may include, for example, a CPU (central processing unit), a semiconductor memory, and a control program stored in the semiconductor memory.

[0066] Figure 2 This is a schematic cross-sectional view of the mold for the molding machine according to the first embodiment. Figure 2 This indicates the state in which the fixed mold 18a and the movable mold 18b are in contact; in other words, it indicates the state in which the fixed mold 18a and the movable mold 18b are closed. The area clamped by the fixed mold 18a and the movable mold 18b is the cavity Ca.

[0067] The fixed mold 18a includes a main body 40 and a local pressure device 50. At least a portion of the local pressure device 50 is assembled in the main body 40.

[0068] The main body 40 has a forming surface 40x and a supporting surface 40y. The supporting surface 40y is opposite to the forming surface 40x. The forming surface 40x is the surface on the side of the cavity Ca. The supporting surface 40y is the surface on the side of the fixed template 24.

[0069] The local pressurization device 50 includes a pressurizing pin 52, an actuator 54, a pressure attenuation component 56, a first sealing component 58, a second sealing component 60, a disc spring 62 (elastic body), and a position sensor 64. The pressurizing pin 52 has a first protrusion 52a. The actuator 54 has a cylinder 54a, a piston 54b, a position sensor rod 54c, a rod-side chamber 54x, and a cover-side chamber 54y. The pressure attenuation component 56 has a second protrusion 56a.

[0070] Disc spring 62 is an example of an elastic body. First protrusion 52a is an example of a protrusion.

[0071] The pressure pin 52 extends in the direction from the forming surface 40x toward the supporting surface 40y. The pressure pin 52 also extends in the mold opening and closing direction.

[0072] One end of the pressure pin 52 protrudes from the molded surface 40x side of the main body 40. One end of the pressure pin 52 may protrude into the cavity Ca. The other end of the pressure pin 52 is provided on the support surface 40y side. The other end of the pressure pin 52 is, for example, fixed to the piston 54b of the actuator 54.

[0073] The pressure pin 52 is, for example, cylindrical. The diameter of the pressure pin 52 is, for example, 10 mm or more and 30 mm or less.

[0074] At least a portion of the pressure-applying pin 52 is surrounded by the pressure-reducing component 56. At least a portion of the pressure-applying pin 52 is surrounded by the main body 40. The pressure-applying pin 52 is slidably disposed relative to the pressure-reducing component 56.

[0075] The first protrusion 52a is part of the pressure pin 52. The first protrusion 52a is, for example, an annular shape. The first protrusion 52a is, for example, a flange shape. The first protrusion 52a is configured to contact the end of the pressure attenuation member 56 on the support surface 40y side.

[0076] The first protrusion 52a, for example, defines the position of the maximum retraction limit of the pressure pin 52. By contacting the main body 40 with the first protrusion 52a, the retraction of the pressure pin 52 is stopped.

[0077] The pressure pin 52 has the function of pressurizing a portion of the molten metal after it begins to solidify in the cavity Ca during the manufacturing of the die-cast part. For example, the pressure pin 52 has the function of pressurizing a portion of the molten metal in the product area.

[0078] The actuator 54 is disposed on the support surface 40y side of the main body 40. The actuator 54 is, for example, fixed on the support surface 40y.

[0079] Actuator 54 is, for example, a hydraulic device. Actuator 54 is, for example, a hydraulic device.

[0080] The piston 54b is configured to slide within the cylinder 54a. A pressure pin 52 is fixed to the main body 40 side of the piston 54b. For example, a position sensor is fixed to the side of the piston 54b opposite to the pressure pin 52 by a rod 54c.

[0081] Working oil can be supplied to the rod-side chamber 54x and the cap-side chamber 54y using a hydraulic circuit (not shown). Additionally, working oil can be discharged from the rod-side chamber 54x and the cap-side chamber 54y using a hydraulic circuit (not shown).

[0082] Actuator 54 has the function of driving pressure pin 52.

[0083] A pressure attenuation member 56 is provided to surround the pressure pin 52 between the pressure pin 52 and the main body 40. One end of the pressure attenuation member 56 protrudes from the molding surface 40x side of the main body 40. One end of the pressure attenuation member 56 protrudes from the cavity Ca of the molding surface 40x. The other end of the pressure pin 52 can, for example, contact the first protrusion 52a of the pressure pin 52.

[0084] The pressure attenuation component 56 is, for example, cylindrical. The diameter of the outer periphery of the pressure attenuation component 56 is, for example, 30 mm or more and 50 mm or less.

[0085] At least a portion of the pressure attenuation member 56 is surrounded by the main body 40. The pressure attenuation member 56 is configured to slide relative to the pressure pin 52 and the main body 40.

[0086] The second protrusion 56a is part of the pressure attenuation member 56. The second protrusion 56a is, for example, in the shape of a flange. The end of the second protrusion 56a on the molding surface 40x side is provided in contact with the main body 40, for example. The end of the second protrusion 56a on the support surface 40y side is in contact with the disc spring 62, for example.

[0087] The second protrusion 56a defines the position of the forward limit of the pressure attenuation member 56. When the second protrusion 56a contacts the main body 40, the forward movement of the pressure attenuation member 56 stops.

[0088] The pressure attenuation component 56 has the function of reducing the pulse pressure generated in the molten liquid during the manufacturing of die castings.

[0089] When the pressure pin 52 is at its retraction limit, one end of the cavity Ca side of the pressure pin 52 is flush with or located at one end of the cavity Ca side of the pressure attenuation component 56 when the pressure attenuation component 56 is at its forward limit, protruding toward the forming surface 40x.

[0090] The first sealing member 58 is disposed between the pressure attenuation member 56 and the main body 40. The first sealing member 58 is annular and surrounds the pressure attenuation member 56. The first sealing member 58 is, for example, fixed to the pressure attenuation member 56.

[0091] The first sealing member 58 is made of a material with high heat resistance. The first sealing member 58 is, for example, a metal. The first sealing member 58 includes, for example, cast iron or steel. The first sealing member 58 has the function of preventing molten liquid from entering between the pressure attenuation member 56 and the main body 40.

[0092] The second sealing member 60 is disposed between the pressure pin 52 and the pressure attenuation member 56. The second sealing member 60 is annular and surrounds the pressure pin 52. The second sealing member 60 is, for example, fixed to the pressure attenuation member 56.

[0093] The second sealing component 60 is made of a material with high heat resistance. The second sealing component 60 is, for example, a metal. The second sealing component 60 includes, for example, cast iron or steel. The second sealing component 60 functions to prevent molten liquid from entering between the pressure pin 52 and the pressure attenuation component 56.

[0094] A disc spring 62 is disposed between the pressure attenuation component 56 and the support surface 40y. A disc spring 62 is disposed between the pressure attenuation component 56 and the main body 40. A disc spring 62 is disposed between the second protrusion 56a and the support surface 40y. A disc spring 62 is disposed between the second protrusion 56a and the main body 40.

[0095] Multiple disc springs 62 are arranged in series, for example. The disc springs 62 have the function of absorbing the pulse pressure generated in the molten metal by flexing during the manufacturing of the die casting.

[0096] Position sensor 64 is positioned near position sensor rod 54c. Position sensor 64 has the function of detecting the position of position sensor rod 54c. Position sensor 64 indirectly monitors the position of pressure pin 52 by detecting the position of position sensor rod 54c.

[0097] The position sensor 64 is, for example, an optical or magnetic linear encoder.

[0098] Next, an example of the operation of the local pressure device 50 in the first embodiment will be described. Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 as well as Figure 10 This is an explanatory diagram of the operation of the local pressurization device according to the first embodiment.

[0099] Before the die-casting part is manufactured, the fixed mold 18a and the movable mold 18b are in a separated state. Figure 3 The first protrusion 52a of the pressure pin 52 contacts, for example, the main body 40. The pressure pin 52 is in the retracted limit position. The pressure attenuation member 56 is in the forward limit position.

[0100] Next, the movable template 26 is moved so that the movable mold 18b fixed on the movable template 26 comes into contact with the fixed mold 18a. Figure 4 A cavity Ca is formed between the movable mold 18b and the fixed mold 18a. Then, the movable mold 18b and the fixed mold 18a are closed using the mold closing device 10.

[0101] Next, molten liquid 70 is filled into the cavity Ca of the mold 18 using the injection device 14. Figure 5Pressure is applied to the molten liquid 70 through the injection device 14, and the pressure of the molten liquid 70 increases.

[0102] When the pressure of the molten liquid 70 rises, the pressure attenuation component 56 retracts under the pressure of the molten liquid 70. The disc spring 62 flexes, absorbing the pressure of the molten liquid 70. The retraction of the pressure attenuation component 56 stops when the pressure of the molten liquid 70 is balanced with the elastic force of the disc spring 62. Figure 6 ).

[0103] Subsequently, under the elastic force of the disc spring 62, the pressure attenuation member 56 advances. At the moment the second protrusion 56a contacts the main body 40, the advancement of the pressure attenuation member 56 stops. Figure 7 The position where the second protrusion 56a contacts the main body 40 becomes the advancing limit of the pressure attenuation component 56.

[0104] Next, actuator 54 is used to advance pressure pin 52. Figure 8 A portion of the molten liquid 70 that begins to solidify via pressure pin 52 is pressurized.

[0105] The timing at which the pressure pin 52 begins to advance is linked to, for example, changes in the injection speed of the injection device 14. For instance, the timing at which the pressure pin 52 begins to advance is controlled by controlling the local pressure device 50 via the control device 32.

[0106] The advance amount of the pressure pin 52 can be controlled, for example, by monitoring the position of the pressure pin 52 using a position sensor 64. The advance amount of the pressure pin 52 can also be controlled, for example, by controlling the local pressure device 50 using a control device 32.

[0107] After the molten metal 70 has completely solidified, the mold is opened using the mold closing device 10. The resulting die-cast part is ejected from the movable mold 18b using the ejection device 12. The pressure pin 52 is retracted to its retraction limit, for example, using an actuator 54. Figure 9 ).

[0108] Next, for example, actuator 54 is used to advance pressure pin 52 ( Figure 10 For example, the pressure pin 52 is advanced to its forward limit. The position where the first protrusion 52a of the pressure pin 52 contacts the pressure attenuation member 56 is the forward limit of the pressure pin 52.

[0109] For example, consider the case where the molten 70 penetrates between the pressure attenuation member 56 and the main body 40 and solidifies, and the pressure attenuation member 56 does not return to its forward limit. Even in this case, by pressing the pressure attenuation member 56 with the pressure pin 52, the pressure attenuation member 56 can be returned to its forward limit.

[0110] Next, the function and effects of the molding die and the molding machine of the first embodiment will be explained. That is, the function and effects of the fixed mold 18a and the die-casting machine 100 of the first embodiment will be explained.

[0111] To improve the quality of die-cast parts, it is desirable to suppress shrinkage cavities inside the die-cast parts. The fixed mold 18a of the first embodiment is equipped with a local pressure device 50. After the molten 70 begins to solidify in the mold 18, the molten 70 can be locally pressured by pressing the pressure pin 52 of the local pressure device 50 into the molten 70.

[0112] By applying pressure to the molten liquid 70 locally, shrinkage cavities can be suppressed. Therefore, the quality of the die-cast parts can be improved by using the fixed mold 18a and the die-casting machine 100 according to the first embodiment.

[0113] Figure 11 This is a graph illustrating an example of the operation of the molding machine according to the first embodiment. The horizontal axis represents time. Figure 11 In the diagram, as time progresses, the plotted points are located on the right side of the paper. The vertical axis on the left side of the paper represents the injection speed, i.e., the speed of the injection plunger in the injection device. Additionally, the vertical axis on the right side of the paper represents the pressure applied to the molten liquid within the cavity Ca.

[0114] Figure 11 In the diagram, the solid line Cv represents the velocity of the injection plunger. Figure 11 In the diagram, the dashed line Cp0 and the solid line Cp1 represent the pressure applied to the molten metal. The dashed line Cp0 represents the case where the mold for the molding machine of the comparative example is used, and the solid line Cp1 represents the case where the mold for the molding machine of the first embodiment is used. The mold for the molding machine of the comparative example differs from the mold for the molding machine of the first embodiment in that it does not have the local pressure device 50.

[0115] Figure 11 The dashed line Cx represents the critical curve for casting burrs. When the pressure applied to the molten metal exceeds the critical curve for casting burrs, the pressure applied to the molten metal exceeds the mold clamping force, which may result in casting burrs.

[0116] From the perspective of initially suppressing gas entrapment into the molten metal, the injection speed is low. The injection speed is increased from the middle of the injection to shorten the filling time of the cavity by the molten metal.

[0117] In particular, to cope with the increasing size or thinner walls of die-cast parts, it is required to fill the cavity in the mold with molten metal in a short time. Therefore, it is necessary to increase the injection speed.

[0118] However, if the injection speed is increased, the pulsating pressure generated in the molten liquid due to the inertial force of the injection plunger can easily lead to casting burrs. For example, in the comparative case, as shown by the dashed line Cp0, the pressure applied to the molten liquid exceeds the casting burr critical curve Cx, which may result in casting burrs.

[0119] If casting burrs are produced, the quality of the die-cast part will be reduced, making it a defective product. Furthermore, it can pose a significant safety hazard, for example.

[0120] The molding die 18a of the first embodiment is equipped with a local pressure device 50. The local pressure device 50 is equipped with a pressure attenuation component 56.

[0121] When molten metal 70 is filled into the cavity Ca of mold 18, as the pressure applied to the molten metal increases, the pressure attenuation member 56 retracts, thus attenuating the pressure applied to the molten metal. Therefore, as shown by the solid line Cp1, the pulse pressure can be reduced. Therefore, by using the mold for the molding machine according to the first embodiment, the quality of the die-casting is improved.

[0122] The local pressure-applying device 50 preferably has a first sealing member 58. For example, when the molten 70 enters between the pressure-reducing member 56 and the main body 40 and solidifies, the movement of the pressure-reducing member 56 is hindered. In particular, when the molten 70 enters the area where the disc spring 62 is provided and solidifies, the pressure-reducing member 56 is completely ineffective.

[0123] By providing the first sealing component 58, the intrusion of molten liquid 70 into the space between the pressure attenuation component 56 and the main body 40 can be suppressed, thereby improving the reliability of the operation of the local pressure device 50.

[0124] Furthermore, the pressure pin 52 preferably has a first protrusion 52a. The first protrusion 52a can press the pressure attenuation member 56. For example, consider the case where the molten metal 70 penetrates between the pressure attenuation member 56 and the main body 40 and solidifies, causing the pressure attenuation member 56 not to return to its forward limit. Even in this case, by pressing the pressure attenuation member 56 with the first protrusion 52a, the pressure attenuation member 56 can be brought back to its forward limit. Therefore, the reliability of the operation of the local pressure device 50 is improved.

[0125] Furthermore, by providing the first protrusion 52a, it is easy to confirm that the pressure attenuation component 56 has returned to its forward limit.

[0126] The local pressure device 50 preferably has a second sealing member 60. For example, if molten 70 infiltrates and solidifies between the pressure pin 52 and the pressure attenuation member 56, it will impede the movement of the pressure pin 52 and the pressure attenuation member 56.

[0127] By providing the second sealing component 60, the intrusion of molten liquid 70 into the space between the pressure pin 52 and the pressure attenuation component 56 can be prevented, thereby improving the reliability of the operation of the local pressure device 50.

[0128] The elastic body of the local pressure device 50 is preferably a disc spring 62. By using the disc spring 62, high pressure can be absorbed with a short displacement.

[0129] Furthermore, by integrating the local pressurization mechanism using the pressurizing pin 52 and the pulse pressure reduction mechanism using the pressure attenuation component 56 into one unit, the local pressurization mechanism and the pulse pressure reduction mechanism can be miniaturized.

[0130] According to the first embodiment, a mold for a molding machine and a molding machine having a local pressure device that can reduce pulse pressure can be realized.

[0131] (Second Implementation)

[0132] The mold for the molding machine in the second embodiment differs from the mold for the molding machine in the following way: when the pressure pin is at its retraction limit, one end of the pressure pin is closer to the support surface than one end of the pressure attenuation member when it is at its forward limit. Furthermore, the molding machine in the second embodiment differs from the molding machine in the first embodiment in that it includes the aforementioned mold. Hereinafter, descriptions that are repeated in the first embodiment will sometimes be omitted.

[0133] Figure 12 This is a schematic cross-sectional view of the mold for the molding machine according to the second embodiment. Figure 12 This indicates the state in which the fixed mold 18a and the movable mold 18b are in contact; in other words, it indicates the state in which the fixed mold 18a and the movable mold 18b are closed. The area sandwiched between the fixed mold 18a and the movable mold 18b is the cavity Ca.

[0134] The fixed mold 18a includes a main body 40 and a local pressure device 50. At least a portion of the local pressure device 50 is assembled in the main body 40.

[0135] The main body 40 has a molding surface 40x and a supporting surface 40y. The supporting surface 40y is opposite to the molding surface 40x. The molding surface 40x is the surface on the side of the cavity Ca. The supporting surface 40y is the surface on the side of the fixed template 24.

[0136] The local pressurization device 50 includes a pressurizing pin 52, an actuator 54, a pressure attenuation component 56, a first sealing component 58, a second sealing component 60, a disc spring 62 (elastic body), and a position sensor 64. The pressurizing pin 52 has a first protrusion 52a. The actuator 54 has a cylinder 54a, a piston 54b, a position sensor rod 54c, a rod-side chamber 54x, and a cover-side chamber 54y. The pressure attenuation component 56 has a second protrusion 56a.

[0137] Disc spring 62 is an example of an elastic body. First protrusion 52a is an example of a protrusion.

[0138] Figure 13 This is a schematic cross-sectional view of the mold for the molding machine according to the second embodiment. Figure 13 This indicates that the pressure pin 52 is at its retracted limit. Figure 13 In the middle, the pressure attenuation component 56 indicates the state at the forward limit.

[0139] The position of the retraction limit of the pressure pin 52 is defined by the position where the first protrusion 52a contacts the main body 40. The position of the forward limit of the pressure attenuation member 56 is defined by the position where the second protrusion 56a contacts the main body 40.

[0140] like Figure 13 As shown, when the pressure pin 52 is at its retraction limit, one end of the pressure pin 52 on the cavity Ca side is closer to the support surface 40y than one end of the pressure attenuation member 56 on the cavity Ca side when the pressure attenuation member 56 is at its forward limit. In other words, the end of the pressure pin 52 on the cavity Ca side is closer to the support surface 40y than the end of the pressure attenuation member 56 on the cavity Ca side.

[0141] Next, an example of the operation of the local pressure device 50 in the second embodiment will be described. Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 as well as Figure 21 This is an explanatory diagram of the operation of the local pressurization device in the second embodiment.

[0142] Before die casting, the fixed mold 18a and the movable mold 18b are in a separated state. Figure 14 The first protrusion 52a of the pressure pin 52 is located, for example, between the pressure attenuation member 56 and the main body 40. The pressure attenuation member 56 is in the position of its forward limit.

[0143] Next, the movable template 26 is moved so that the movable mold 18b fixed on the movable template 26 comes into contact with the fixed mold 18a. Figure 15A cavity Ca is formed between the movable mold 18b and the fixed mold 18a. Then, the movable mold 18b and the fixed mold 18a are closed using the mold closing device 10.

[0144] Next, molten liquid 70 is filled into the cavity Ca of the mold 18 using the injection device 14. Figure 16 Pressure is applied to the molten liquid 70 through the injection device 14, and the pressure of the molten liquid 70 increases.

[0145] When the pressure of the molten liquid 70 rises, the pressure attenuation component 56 retracts under the pressure of the molten liquid 70. The disc spring 62 flexes, absorbing the pressure of the molten liquid 70. The retraction of the pressure attenuation component 56 stops when the pressure of the molten liquid 70 is balanced with the elastic force of the disc spring 62.

[0146] Additionally, when the pressure of the molten liquid 70 increases, the pressure pin 52 retracts under the pressure of the molten liquid 70. For example, the working oil in the cover chamber 54y is compressed, absorbing the pressure of the molten liquid 70. The retraction of the pressure pin 52 stops when the pressure of the molten liquid 70 is balanced with the pressure of the working oil in the cover chamber 54y. Figure 17 ).

[0147] Subsequently, due to the elastic force of the disc spring 62, the pressure attenuation member 56 advances. When the second protrusion 56a contacts the main body 40, the pressure attenuation member 56 stops advancing. The position where the second protrusion 56a contacts the main body 40 becomes the advancing limit of the pressure attenuation member 56.

[0148] Additionally, actuator 54 is used to advance pressure pin 52 ( Figure 18 The timing at which the pressure pin 52 begins to advance is based, for example, on the measurement results of the position sensor 64. For instance, the position sensor 64 detects the retraction of the pressure pin 52 caused by the pressure of the molten metal 70, and after a predetermined time elapses from the retraction of the pressure pin 52, the pressure pin 52 is advanced. For example, the control device 32 controls the local pressure device 50 based on the measurement results of the position sensor 64, thereby controlling the timing at which the pressure pin 52 begins to advance.

[0149] Next, actuator 54 is used to advance pressure pin 52 further. Figure 19 A portion of the molten liquid 70 that has begun to solidify is pressurized by the pressure pin 52. For example, the timing at which the pressure pin 52 begins to advance is controlled by the local pressure device 50 controlled by the control device 32.

[0150] The advance amount of the pressure pin 52 can be controlled, for example, by monitoring the position of the pressure pin 52 using a position sensor 64. The advance amount of the pressure pin 52 can also be controlled, for example, by controlling the local pressure device 50 using a control device 32.

[0151] After the molten metal 70 has completely solidified, the mold is opened using the mold closing device 10. The manufactured die-cast part is ejected from the movable mold 18b using the ejection device 12. For example, the pressure pin 52 is retracted using the actuator 54. Figure 20 ).

[0152] Next, for example, actuator 54 is used to advance pressure pin 52 ( Figure 21 For example, the pressure pin 52 is advanced to its forward limit. The position where the first protrusion 52a of the pressure pin 52 contacts the pressure attenuation member 56 is the forward limit of the pressure pin 52.

[0153] For example, consider the case where the molten 70 penetrates between the pressure attenuation member 56 and the main body 40 and solidifies, causing the pressure attenuation member 56 not to return to its forward limit. Even in this case, by pressing the pressure attenuation member 56 with the pressure pin 52, the pressure attenuation member 56 can be brought back to its forward limit.

[0154] Next, the function and effect of the molding die and the molding machine of the second embodiment will be explained. That is, the function and effect of the fixed mold 18a and the die-casting machine 100 of the second embodiment will be explained.

[0155] The fixed mold 18a and die-casting machine 100 according to the second embodiment, like those in the first embodiment, can suppress shrinkage cavities by providing a local pressure device 50. Therefore, the fixed mold 18a and die-casting machine 100 according to the second embodiment can improve the quality of die-cast parts.

[0156] The molding die 18a of the second embodiment includes a local pressure device 50. The local pressure device 50 includes a pressure attenuation component 56.

[0157] By incorporating the pressure attenuation component 56, the pulse pressure can be reduced, similar to the first embodiment. Furthermore, when the cavity Ca of the mold 18 is filled with molten metal 70, the pressure applied to the molten metal increases, causing the pressure pin 52 to retract. In addition to the pressure attenuation component 56, the retraction of the pressure pin 52 further reduces the pulse pressure. Therefore, by using the mold for the molding machine according to the second embodiment, the quality of the die-casting is improved.

[0158] Furthermore, according to the second embodiment, the timing for the pressure pin 52 to begin advancing can be set by detecting the retraction of the pressure pin 52 using the position sensor 64. Therefore, the timing for pressurizing the molten 70 can be set to an optimal time. Thus, by using the die for the molding machine according to the second embodiment, the quality of the die-casting is further improved.

[0159] According to the second embodiment, a mold for a molding machine and a molding machine having a local pressure device that can reduce pulse pressure can be realized.

[0160] The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In the embodiments, parts of the mold for the molding machine and the molding machine that are not directly necessary in the description of the present invention have been omitted, but necessary elements related to the mold for the molding machine and the molding machine can be appropriately selected and used.

[0161] In the first and second embodiments, the case of a fixed mold 18a for the molding machine of the present invention was described as an example, but the mold for the molding machine of the present invention may also be a movable mold 18b. That is, the movable mold 18b may also have a structure that includes a local pressure device 50.

[0162] In the first and second embodiments, the case where the local pressurizing device 50 pressurizes the product area of ​​the cavity Ca was described as an example. However, the structure where the local pressurizing device 50 pressurizes the non-product area of ​​the cavity Ca can also be used. The non-product area is, for example, a flow channel, an overflow channel, or an exhaust port.

[0163] In the first and second embodiments, the case of disc spring 62 as the elastic body was described as an example, but the elastic body may also be a helical spring or a leaf spring, in addition to disc spring 62.

[0164] In the first and second embodiments, the case in which one local pressure device 50 is provided in the mold of the molding machine is described as an example, but multiple local pressure devices 50 may also be provided in the mold of the molding machine.

[0165] In the first and second embodiments, examples of die-casting machines were described using casting equipment, but the present invention can also be applied to injection molding machines and the like.

[0166] In addition, all molding machines and molding dies that incorporate the elements of this invention and can be appropriately designed and modified by those skilled in the art are included within the scope of this invention. The scope of this invention is defined by the scope of the technical solutions and their equivalents.

[0167] Symbol Explanation

[0168] 40 main body sections

[0169] 40x molding surface

[0170] 40y support surface

[0171] 50 Local Pressure Regulator

[0172] 52 plus pressure sales

[0173] 52a 1st convex part (convex part)

[0174] 54 actuators

[0175] 56 Pressure Attenuation Components

[0176] 58 First sealing component

[0177] 60 Second sealing component

[0178] 62 Disc Spring (Elastomer)

[0179] 64 position sensors

[0180] 100 die casting machine

[0181] Ca cavity

Claims

1. A mold for a molding machine, characterized in that, It comprises: a main body having a molding surface and a support surface facing the molding surface; and a local pressure device, at least a portion of which is assembled to the main body. The aforementioned local pressurization device includes: The pressure pin has one end protruding from the molded surface side of the main body. An actuator is provided on the support surface side of the main body to drive the pressure pin; A pressure attenuation component is disposed between the pressure pin and the main body, surrounding the pressure pin, with one end protruding from the molded surface side of the main body, and has the function of reducing the pulse pressure generated in the molten metal, and has a second protrusion; and An elastomer is disposed between the pressure damping component and the support surface. The aforementioned pressure pin has a first protrusion that can contact the other end of the aforementioned pressure attenuation component, and this first protrusion is provided to contact the aforementioned main body. The end of the second protrusion on the molding surface side is provided in contact with the main body, and the end of the second protrusion on the support surface side is provided in contact with the elastomer.

2. The mold for a molding machine as described in claim 1, characterized in that, The aforementioned local pressurization device further includes an annular first sealing member disposed between the aforementioned pressure attenuation member and the aforementioned main body, surrounding the aforementioned pressure attenuation member.

3. The mold for a molding machine as described in claim 2, characterized in that, The first sealing component mentioned above is made of cast iron or steel.

4. The mold for a molding machine as described in claim 2, characterized in that, The aforementioned local pressurization device further includes an annular second sealing component disposed between the pressurization pin and the pressure attenuation component, surrounding the pressurization pin.

5. The mold for a molding machine as described in any one of claims 1-4, characterized in that, It also has a position sensor that monitors the position of the aforementioned pressure pin.

6. The mold for a molding machine as described in any one of claims 1-4, characterized in that, The aforementioned elastic body is a disc spring.

7. The mold for a molding machine as described in any one of claims 1-4, characterized in that, When the pressure pin is at the retraction limit, one end of the pressure pin is located at a position that is flush with or protrudes from the molding surface side of the pressure attenuation component when the pressure attenuation component is at the forward limit.

8. The mold for a molding machine as described in any one of claims 1-4, characterized in that, When the pressure pin is at the retraction limit, one end of the pressure pin is located on the support surface side, compared to the end of the pressure attenuation component when the pressure attenuation component is at the forward limit.

9. A molding machine having a mold for molding machine according to any one of claims 1-8.

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