JP2022075049A - Extrusion device and molding machine - Google Patents

Abstract

To provide an extrusion device having a new structure.SOLUTION: An extrusion device 11 drives extrusion pins 41 inserted into a movable die 105 in a die opening/closing direction. The extrusion device 11 has: a support member 49; a drive member 51; a liquid pressure drive part 57; and an electric drive part 55. The support member 49 is fixed to a movable die plate 17. The drive member 51 is fixed to an extrusion plate 43. The extrusion plate 43 is located in a space 105s formed by a die base 105a of the movable die 105 and fixed to the extrusion pins 41. The movable die plate 17 holds the movable die 105. The liquid pressure drive part 57 and the electric drive part 55 drive the drive member 51 relative to the support member 49.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to extruders and molding machines. The molding machine is, for example, a die casting machine or an injection molding machine.

A molding machine is known that solidifies a molding material in a mold to produce a molded product. The mold includes a fixed mold and a mobile mold driven in the mold opening / closing direction (directions approaching and separating from the fixed mold). When the mobile mold moves to the side of the fixed mold and the two come into contact with each other, a cavity is formed between the two, in which the molding material before solidification (for example, in a molten state) is filled. When the molded material in the cavity is solidified and then the mobile mold is moved to the opposite side of the fixed mold, the solidified molding material (molded article) is separated from the fixed mold, for example, and remains in the mobile mold. The molded product remaining in the mobile mold is, for example, pushed toward the fixed mold by an extrusion pin inserted in the mold opening / closing direction in the mobile mold, and is separated from the mobile mold.

As an extruder for driving an extrusion pin with respect to a mobile type, various configurations have been proposed (for example, Patent Documents 1 to 5 below).

The extruder of Patent Document 1 has the following configuration. Multiple extrusion pins that are inserted into the movable mold in the mold opening / closing direction and inserted into the moving die plate that holds the mobile mold in the mold opening / closing direction. An extrusion plate located behind a moving die plate (opposite the mobile die plate) and secured to multiple extrusion pins. An electric drive unit and a hydraulic drive unit that drive the extrusion plate in the mold opening / closing direction with respect to the moving die plate.

The extruders of Patent Documents 2, 4 and 5 drive an extrusion pin by an electric drive unit including a rotary motor and a screw mechanism that converts the rotation of the motor into linear motion. In the extruder of Patent Document 3, the extrusion pin is driven by a hydraulic cylinder.

Japanese Unexamined Patent Publication No. 2014-18837 JP-A-2007-106129 Japanese Unexamined Patent Publication No. 2014-144479 Japanese Unexamined Patent Publication No. 2018-27656 International Publication No. 2013/38501

The various configurations proposed for extruders have their own strengths and weaknesses, respectively. On the other hand, the performance required for the extruder also varies depending on the user, the type of molding machine, and the like. The known configuration may not always be optimal for the user, the type of molding machine, or the like. Therefore, it is hoped that a new configuration will be proposed as the configuration of the extruder and that the technology will be enriched.

The extruder according to one aspect of the present disclosure is an extruder that drives an extrusion pin that is inserted into one of a fixed type and a mobile type in the mold opening / closing direction, and is configured by a die base of the one type. Of the extrusion plate located in the space and fixed to the extrusion pin and the die plate holding the one mold, the first member fixed to one member, and the other of the extrusion plate and the die plate. A second member fixed to the member, a hydraulic drive unit for driving the second member with respect to the first member, and an electric drive unit for driving the second member with respect to the first member. have. The molding machine according to one aspect of the present disclosure includes the above-mentioned extruder.

According to the above configuration, a new extruder and molding machine for driving an extruder located in a space composed of a die base by a hydraulic drive unit and an electric drive unit are provided, and the technology is enriched. It is planned.

The side view which shows the structure of the main part of the die casting machine which concerns on embodiment. The side view which shows the structure of the die of the die casting machine of FIG. 1 and its periphery. FIG. 1 is a cross-sectional view showing a configuration of a drive unit of an extruder of the die casting machine of FIG. FIG. 3 is a cross-sectional view showing a configuration of a drive unit of an extruder in a state different from that of FIG. FIG. 3 is a cross-sectional view showing a configuration of a drive unit of an extruder in a state different from that of FIGS. 3 and 4. FIG. 2 is a cross-sectional view showing the configuration of a core device of the die casting machine of FIG. FIG. 6 is a cross-sectional view showing a configuration of a core device in a state different from that of FIG. FIG. 6 is a cross-sectional view showing a configuration of a core device in a state different from that of FIGS. 6 and 7. 9 (a) is a circuit diagram showing the configuration of the main part of the hydraulic pressure device of the die casting machine of FIG. 1, and FIG. 9 (b) is a circuit diagram showing the configuration of the main part of the hydraulic pressure device according to the modified example.

(Outline of molding by die casting machine)
FIG. 1 is a side view showing a configuration of a main part of the die casting machine 1 according to the first embodiment, including a cross-sectional view in part. In FIG. 1 or another drawing including a cross section in part, for convenience, two or more cross sections that are not necessarily located in the same plane may be shown together. The vertical direction of the paper surface in FIG. 1 is, for example, a vertical direction.

The die casting machine 1 is, for example, a device for manufacturing a product (molded product, die casting product) made of solidified molding material by injecting (filling) a molten molding material into the inside (cavity 107) of the mold 101. It is configured. In FIG. 1, a part of the inner surface of the cavity 107 (a part composed of the mobile type 105 described later) is shown by a two-dot chain line.

The molding material is, for example, a metal such as aluminum. The molten metal is sometimes called a molten metal. Instead of the molded material in the molten state, the molding material in the solid-liquid coexisting state (semi-solidified state or semi-melted state) may be injected into the cavity 107.

The mold 101 has, for example, a fixed mold 103 and a mobile mold 105 facing the fixed mold 103. In FIG. 1, for convenience, the cross section of the fixed mold 103 or the mobile mold 105 is shown by one type of hatching. However, these molds may be directly carved or nested. The fixed type 103 is a type that does not move. The mobile type 105 is a type that moves in the direction opposite to the fixed type 103, and can move between the position indicated by the solid line and the position indicated by the alternate long and short dash line. The opposite direction of the fixed type 103 and the mobile type 105 is, for example, a horizontal direction.

By moving the mobile mold 105 in the mold closing direction (the direction on the side of the fixed mold 103 with respect to the mobile mold 105; the same applies hereinafter), the mold closing is performed so that the mobile mold 105 is brought close to the fixed mold 103. Mold closing is generally completed by mold contact (contact of mobile 105 with fixed mold 103). By mold contact, a cavity 107 is formed between the fixed mold 103 and the mobile mold 105.

After closing the mold, a force (mold clamping force) for tightening the fixed mold 103 and the moving mold 105 in the opposite directions is applied to the mold 101. After molding, the molding material is injected into the cavity 107. The mold 101 is given a pressure in the direction of opening the mold 101 from the molten metal injected into the cavity 107. However, since the mold clamping force is applied, the mold 101 is maintained in the closed state.

The molding material injected into the cavity 107 solidifies into a molded product. After that, when the mobile mold 105 moves in the mold opening direction (the direction opposite to the fixed mold 103 with respect to the mobile mold 105; the same applies hereinafter), the mold opening that separates the mobile mold 105 from the fixed mold 103 is opened. Will be done. As a result, the molded product can be taken out. The combination of the mold closing direction and the mold opening direction may be referred to as a mold opening / closing direction.

When the mold is opened to remove the molded product, the molded product separates from one mold of the fixed mold 103 or the mobile mold 105 and remains in the other mold. After that, the molded product is extruded from the other mold to the side of the one mold by an extrusion pin (described later) inserted into the other mold. The shape of the mobile mold 105 and the fixed mold 103 determines whether the molded product remains in the fixed mold 103 or the fixed mold 105 when the mold is opened. In the die casting machine 1 according to the present embodiment, it is assumed that the molded product remains in the mobile mold 105 due to the mold opening.

The mold 101 may include a core 109 (movable core). The core 109 is movable in a direction (for example, in the vertical direction in the illustrated example) intersecting (for example, orthogonal to) the mold opening / closing direction. The core 109 moves in the direction between the fixed mold 103 and the mobile mold 105 before or in parallel with the mold closing, and by extension, a part of the core 109 is located in the cavity 107. Further, the core 109 moves in a direction of retracting from between the fixed mold 103 and the mobile mold 105 in parallel with the mold opening, or after the mold opening and before the extrusion of the molded product, and eventually from the molded product. It is pulled out. With such a core 109, for example, a recess or a through hole that opens in a direction intersecting the mold opening / closing direction is formed in the molded product.

(Overview of die casting machine configuration)
The die casting machine 1 has a machine main body 3 that performs mechanical operation and a control device 5 that controls the machine main body 3. The machine body 3 has, for example, the following devices. A mold clamping device 7 that opens and closes the mold 101 and clamps the mold. An injection device 9 for injecting molten metal into the cavity 107. An extruder 11 that extrudes a molded product formed by solidifying the molten metal from the mobile 105. The core device 13 that drives the core 109.

The configuration and operation of the machine body 3 may be various configurations and operations including known configurations and operations, except for the configuration and operation of the extruder 11. However, in the description of the present embodiment, a novel configuration and / or operation may be exemplified with respect to a configuration and operation which may be a known configuration and operation. For example, a novel configuration and operation of the core device 13 will be exemplified. Further, a novel configuration (particularly its arrangement) of the hydraulic pressure device for supplying the hydraulic fluid (for example, oil) to the extruder 11 and / or the core device 13 is exemplified.

In the following, first, the configuration of the mold clamping device 7, the configuration of the injection device 9, and the configuration of the control device 5 will be illustrated. Next, the configuration of the extruder 11 will be described. Next, the configuration of the new core device 13 will be described. Next, the configuration of the hydraulic pressure device that supplies the hydraulic fluid to the extruder 11 and the core device 13 will be described. After that, the operation of the extruder 11 and the operation of the core device 13 will be described. In the following description, the description of the configuration and operation which may be the same as the known configuration and operation will be omitted as appropriate.

The configuration shared by the extrusion device 11 and other devices (mold clamping device 7, injection device 9, etc.) (for example, the control device 5 and the hydraulic pressure device 67 described later) is regarded as a part of the die casting machine 1. It may be taken as a part of the extruder 11.

(Molding device)
The mold clamping device 7 includes, for example, a base 14, a fixed die plate 15 and a moving die plate 17 facing each other on the base 14, and one or more (usually a plurality of, for example) spanned over the two die plates. It has four) tie bars 19.

The fixed die plate 15 is fixed to the base 14 and holds the fixed die 103 on the surface facing the moving die plate 17. The moving die plate 17 is movable on the base 14 in the direction facing the fixed die plate 15 (mold opening / closing direction), and holds the moving die 105 on the surface facing the fixed die plate 15. The tie bar 19 is fixed to one die plate (fixed die plate 15 in the illustrated example) of the fixed die plate 15 and the moving die plate 17 at least at the time of mold clamping, and the other die plate (in the illustrated example). It is inserted so as to be relatively movable in the axial direction with respect to the moving die plate 17).

The mold 101 is opened and closed by moving the moving die plate 17 in the mold opening and closing direction. In the tie bar 19, in a state where the mold 101 is closed (mold contact), the portion on the side of the other die plate (moving die plate 17) is the same as the one die plate with respect to the other die plate. Is pulled to the opposite side (on the left side of the paper in the example shown). As a result, a mold clamping force corresponding to the amount of extension of the tie bar 19 can be obtained.

The drive unit of the mold clamping device 7 for realizing the mold opening / closing and mold clamping as described above may have various configurations. In the illustrated example, as the drive unit, an electric and toggle type mold clamping drive unit 21 is exemplified. The mold clamping drive unit 21 is connected to, for example, a link housing 23 located behind the moving die plate 17 (on the side opposite to the fixed die plate 15) on the base 14, and the link housing 23 and the moving die plate 17. It has a link mechanism 25 and a mold clamping electric motor 27 that applies a driving force to the link mechanism 25.

In addition, instead of or in addition to the mold clamping motor 27, a hydraulic cylinder (for example, a hydraulic cylinder) that applies a driving force to the link mechanism 25 may be provided. That is, the drive unit of the toggle type (or other type) mold clamping device 7 may be a hydraulic type or a hybrid type in which an electric type and a hydraulic type are combined.

Further, the drive unit of the mold clamping device 7 may be a type other than the toggle type. For example, the mold clamping device may have a drive unit for opening and closing the mold and a drive unit for mold clamping separately. In such an embodiment, the drive unit for opening and closing the mold may be, for example, a hydraulic cylinder, or has a rotary motor and a conversion mechanism (for example, a screw mechanism) that converts the rotation of the motor into linear motion. It may be assumed. The mold clamping drive unit may be, for example, a mold clamping cylinder having a piston fixed to the tie bar 19.

(Injection device)
The injection device 9 has, for example, a sleeve 35 leading to the inside of the mold 101, a plunger 37 slidable in the sleeve 35, and an injection drive unit 39 for driving the plunger 37. With the molding material arranged in the sleeve 35, the plunger 37 moves toward the mold 101, so that the molding material is extruded (injected) into the mold 101. Since the sleeve 35 and the plunger 37 can be regarded as consumables, only the injection drive unit 39 may be regarded as an injection device.

In the illustrated example, the injection device 9 corresponds to a so-called cold chamber machine. That is, the molding material is supplied into the sleeve 35 from the supply port 35a opened on the upper surface of the sleeve 35 by a supply device (hot water supply device) (not shown). However, the injection device 9 may be configured to correspond to a so-called hot chamber machine. The injection drive unit 39 may be a hydraulic type (for example, hydraulic type), an electric type, or a hybrid type in which a hydraulic type and an electric type are combined.

(Control device)
The control device 5 may be configured to include, for example, a computer, although not particularly shown. The computer may be configured to include, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an external storage device, although not particularly shown. By executing the program stored in the ROM and / or the external storage device by the CPU, various functional units that perform various operations (including control) are constructed. Further, the control device 5 may include a logic circuit that executes a certain operation, may include a power supply circuit, or may be conceptualized including a driver. The control device 5 may be integrated in one place in terms of hardware, or may be distributed in a plurality of places.

Under the control of the control device 5, for example, the series of operations (molding cycle) described above for manufacturing a molded product is repeatedly performed. To be confirmed, the molding cycle includes mold opening / closing and mold clamping by the mold clamping device 7, injection by the injection device 9, extrusion by the extrusion device 11, and insertion / removal of the core by the core device 13. The operation of the die casting machine 1 described in the present embodiment may be interpreted as being controlled by the control device 5 unless otherwise specified and unless it is peculiar in the light of common general technical knowledge.

(Extruder)
FIG. 2 is a schematic diagram showing a configuration of a main part of the mold 101 and its surroundings. The schematic view is a side view including a cross-sectional view in part.

The mobile 105 has a die base 105a (in the present disclosure, the die base 105a is referred to as being part of the mobile 105). The die base 105a contributes to the attachment of the mobile type 105 to the moving die plate 17, and also contributes to forming a space 105s for accommodating a part of the extruder 11. The configuration of the die base 105a may be various configurations including known configurations. For example, the die base 105a is generally configured in a hollow rectangular parallelepiped shape, and the side of the main body (right side of the paper surface) of the movable type 105 is open. The surface of the space 105s on the moving die plate 17 side may be formed by a part of the moving die plate 105 as shown in the figure, or may be formed by a part of the moving die plate 17 unlike the drawing. ..

The extruder 11 has, for example, the following configuration. Multiple extrusion pins 41 for pushing the part. Extrusion plate 43 for holding a plurality of extrusion pins 41. A plurality of guide pins 45 for guiding the extrusion plate 43 when the extrusion pin 41 is moved. The extrusion drive unit 47 that drives the extrusion plate 43. Since a part of the above components (for example, the extrusion pin 41 and the extrusion plate 43) is replaced with the replacement of the mold 101, the extrusion device 11 is defined except for the part of the components. You may. For example, only the extrusion drive unit 47 may be regarded as an extrusion device.

The extrusion pin 41 is, for example, a shaft-shaped member having a flange portion at a rear end, for example. The extrusion pin 41 is inserted in the mold opening / closing direction with respect to the movable mold 105 (more strictly, a portion on the right side of the paper surface with respect to the die base 105a), and is relatively movable in the insertion direction with respect to the mobile mold 105. The plurality of extrusion pins 41 may be provided at appropriate positions and numbers according to the shape in the mold 101 (the shape of the space including not only the cavity 107 but also the runner and the like). In theory, the number of extrusion pins 41 can be one.

The extrusion pin 41 is arranged so that, for example, when the molding material is injected into the cavity 107, its tip surface coincides with the inner surface constituting the cavity 107 of the mobile type 105. Then, when the molding material is solidified and the mold is opened, it is driven toward the fixed mold 103 so as to protrude from the inner surface of the mobile mold 105. As a result, the molded product is extruded.

The extrusion pin 41 may be located inside the inner surface of the mobile type 105 when the molding material is injected into the cavity 107. Then, the extrusion pin 41 may contribute to the local pressurization of the molding material like a squeeze pin by being driven toward the cavity 107 in the process of solidifying the molding material.

The extrusion pin 41 may be driven, for example, with a full stroke. That is, when the molding material is ejected, the extrusion pin 41 may be located in the retracting limit (driving limit in the mold opening direction), and when the molded product is extruded, the extrusion pin 41 is driven in the forward limit (driving in the mold closing direction). It may be driven up to the limit). The drive limit is a position where movement is physically restricted (hereinafter, the same applies unless otherwise specified). However, the extrusion pin 41 does not have to be driven at full stroke. The drive limit of the extrusion pin 41 may be appropriately defined, and may be defined by the drive limit of the extrusion plate 43 and / or the drive limit of the extrusion drive unit 47, as described later.

The extruded plate 43 has, for example, a front side plate 43a and a rear side plate 43b that is vertically overlapped and fixed to the front side plate 43a. The extrusion pin 41 is fixed to the extrusion plate 43, for example, by being inserted into the front side plate 43a and having a flange portion provided at the rear end sandwiched between the front side plate 43a and the rear side plate 43b. The extrusion plate 43 may further have a plate (not shown) that overlaps with the rear side plate 43b and is fixed to the extrusion drive unit 47 on the side opposite to the front side plate 43a of the rear side plate 43b. The extrusion plate 43 is housed in the space 105s of the mobile type 105. Since the plurality of extrusion pins 41 are commonly fixed to the extrusion plate 43, they both move relative to the moving mold 105 as the extrusion plate 43 moves relative to the moving mold 105.

The extrusion plate 43 is driven in the mold closing direction by contacting the movable mold 105 with an appropriate stopper (for example, the surface on the right side of the paper surface of the inner surface constituting the space 105s of the mobile mold 105) in the mold closing direction. Limits may be specified. This drive limit may or may not define the advance limit of the extrusion pin 41. Further, the extrusion plate 43 has a drive limit in the mold opening direction due to contact with an appropriate stopper (for example, the surface of the moving die plate 17 on the side of the moving mold 105) that is immovable with respect to the moving mold 105. May be specified. This drive limit may or may not define the recess limit of the extrusion pin 41.

The guide pin 45 has substantially the same configuration as the extrusion pin 41 except for, for example, its arrangement position and specific dimensions. That is, the approximate shape of the guide pin 45 is a shaft shape having a flange portion at the rear end. The guide pin 45 is inserted in the mold opening / closing direction with respect to the movable mold 105 (a portion on the front side of the die base 105a), and is relatively movable in the insertion direction with respect to the mobile mold 105. Further, the guide pin 45 has a flange portion at the rear end fixed to the extrusion plate 43 in the same manner as the extrusion pin 41, for example. Unlike the extrusion pin 41, for example, the plurality of guide pins 45 are located outside the cavity 107 when viewed in the mold opening / closing direction. The positions and the number of the plurality of guide pins 45 may be appropriately set. For example, the guide pins 45 are located at the four corners of the movable type 105. In theory, the guide pin 45 can be omitted, and can be one.

The extrusion drive unit 47 has a support member 49 fixed to the moving die plate 17 and a drive member 51 driven in the mold opening / closing direction with respect to the support member 49. The drive member 51 is fixed to the extrusion plate 43. Then, the extrusion drive unit 47 generates a driving force for driving the drive member 51 with respect to the support member 49 in the mold opening / closing direction. As a result, the extrusion plate 43 moves relative to the moving die plate 17 in the mold opening / closing direction, and eventually the extrusion pin 41 moves relative to the moving mold 105 in the mold opening / closing direction.

The method of fixing the drive member 51 and the extrusion plate 43 may be various methods including known methods. In the illustrated example, the drive member 51 and the extrusion plate 43 are fixed to the moving die plate 17 via an extrusion rod 53 inserted in the mold opening / closing direction. The connection between the extrusion rod 53 and the drive member 51 and / or the connection between the extrusion rod 53 and the extrusion plate 43 may be made by an appropriate method such as a bolt or a clamp (for example, an air clamp).

Unlike the illustrated example, the drive member 51 may have a shaft shape inserted into the moving die plate 17 and may be directly connected to the extrusion plate 43 without the intervention of the extrusion rod 53. Further, the extrusion device has a plurality of extrusion rods and a plate-shaped member located behind the moving die plate 17 (on the left side of the paper surface) and fixed to the plurality of extrusion rods. The member may be driven with respect to the moving die plate 17.

(Extrusion drive unit)
3 to 5 are cross-sectional views showing the configuration of the extrusion drive unit 47. It should be noted that these figures also show a partial configuration of the hydraulic pressure device 67 that supplies the hydraulic fluid to the extrusion drive unit 47. In these figures, the vertical direction of the paper surface corresponds to the vertical direction of the paper surface of FIG. FIG. 3 shows a state before starting extrusion by the extrusion pin 41. FIG. 4 shows a state in which the initial operation of extrusion is performed. FIG. 5 shows a state in which extrusion is completed.

As described above, the extrusion drive unit 47 includes a support member 49 fixed to the moving die plate 17 and a drive member 51 driven in the movement direction (mold opening / closing direction) of the extrusion pin 41 with respect to the support member 49. have. The extrusion drive unit 47 has an electric drive unit 55 and a hydraulic pressure drive unit 57 as drive units that generate a drive force for relatively moving the drive member 51 with respect to the support member 49. That is, the drive system of the extrusion drive unit 47 is a hybrid system that combines an electric system and a hydraulic system. The support member 49 and the drive member 51 may be regarded as a part of the electric drive unit 55 and / or the hydraulic drive unit 57. The specific configuration of each part of the extrusion drive part 47 is, for example, as follows.

(Support member)
The shape and dimensions of the support member 49 may be appropriately set. In the illustrated example, the support member 49 is configured to also serve as the cylinder portion of the hydraulic pressure drive portion 57 (hydraulic cylinder). Specifically, the support member 49 has, for example, a cylindrical portion 49a (cylinder tube) extending in the drive direction (mold opening / closing direction) and a tubular portion 49a forward (direction in which the drive member 51 extends from the support member 49). It has a front end portion 49b that closes from the rear and a rear end portion 49c that closes the tubular portion 49a from the rear.

The shape of the cross section (cross section orthogonal to the driving direction) of the tubular portion 49a is, for example, a circle. The front end portion 49b may be, for example, a substantially plate-shaped member, and may have a flange protruding radially outward from the outer peripheral surface of the tubular portion 49a. The flange of the front end 49b may contribute to the fixation of the support member 49 to the moving die plate 17. The rear end portion 49c may be, for example, a substantially plate-shaped member, and may have a flange protruding radially outward from the outer peripheral surface of the tubular portion 49a. The flange of the rear end portion 49c may be used to support a part of the electric drive portion 55.

As will be understood from the explanation described later, the portion of the support member 49 that is truly used as the cylinder portion may be only a part of the rear end side (left side of the paper surface) (however, the description of the present embodiment). Then, for convenience, the term of the support member 49 may be used as a synonym for the term of the cylinder portion). Therefore, the front end side portion of the support member 49 may not be sealed (it may be open to the atmosphere). Further, the shape of the front end side portion may be different from the shape of the general cylinder portion. For example, the front end side portion may be composed of a combination of rods extending in parallel with each other. Further, as will be described later, the rear end side portion of the support member 49 may be sealed only on the outer peripheral side portion, unlike the general cylinder portion. However, the front end side portion and / or the rear end side portion may be the same as the general cylinder portion.

(Drive member)
The shape, dimensions, and the like of the drive member 51 may be appropriately set. In the illustrated example, the drive member 51 has a shaft-shaped rod portion 51c, a connecting portion 51a located at the front end (the end on the right side of the paper surface) of the rod portion 51c, and an appropriate rod portion 51c in the length direction. It has an engaging portion 51b located at a position. The rod portion 51c is a portion that constitutes most of the drive member 51. The connecting portion 51a is a portion connected to the extrusion plate 43 (more specifically, the extrusion rod 53). The engaging portion 51b is, for example, a portion that contributes to the engagement of the hydraulic pressure driving portion 57 with the piston 61 (described later). These parts may be integrally formed or may be formed of different members from each other. Further, the shape and dimensions of each part may be appropriately set. In the illustrated example, it is as follows.

The rod portion 51c extends in the driving direction (mold opening / closing direction) of the driving member 51. In the illustrated example, the rod portion 51c has a length in the axial direction (mold opening / closing direction) longer than the diameter. However, the former may be equal to or less than the latter. The outer shape (shape of the outer surface) of the rod portion 51c is, for example, a columnar shape. Further, the rod portion 51c is hollow so as to accommodate a part of the electric drive portion 55. The shape of the cross section of the inner surface is, for example, a circle. Therefore, the rod portion 51c is configured to have a substantially cylindrical shape as a whole.

The rod portion 51c extends from the inside of the support member 49 to the outside through an opening formed in the front end portion 49b of the support member 49. The outer surface of the rod portion 51c may or may not slide with respect to the front end portion 49b of the support member 49 (example in the figure). In other words, the front end 49b may or may not contribute to the support of the drive member 51. Although not particularly shown, the rod portion 51c may have a spline groove extending in the axial direction. The front end portion 49b may have a convex portion that is inserted into the spline groove to regulate the rotation of the drive member 51 around the axis.

As shown in FIG. 3, the rod portion 51c may be inserted into the piston 61 (described later) of the hydraulic pressure drive portion 57 when at least the drive member 51 is located at the receding limit with respect to the support member 49. Thereby, for example, the extrusion drive portion 47 can be shortened as compared with the embodiment in which the rod portion 51c is not inserted into the piston 61 (the embodiment is also included in the technique according to the present disclosure). The insertion amount of the rod portion 51c into the piston 61 and the positional relationship between the rod portion 51c and the piston 61 when the drive member 51 is located at the retracting limit may be appropriately set. For example, the insertion amount may be ½ or more or 2/3 or more of the axial length of the piston 61. Further, for example, the rear end of the rod portion 51c may be located in front of the rear end of the piston 61 (example in the figure) or may be located in the rear. The distance between the two rear ends may be 1/2 or less or 1/3 or less of the axial length of the piston 61. When the rod portion 51c is inserted through the piston 61, the outer surface of the rod portion 51c may be separated from the inner surface of the piston 61, for example (both may be configured not to slide with each other).

The connecting portion 51a is fixed to the front end of the rod portion 51c (or the connecting portion 51a may be regarded as the front end of the rod portion 51c), and is outside the support member 49 regardless of the position of the driving member 51. positioned. The configuration of the connecting portion 51a may be an appropriate configuration according to the connecting mode. In the illustrated example, the connecting portion 51a has a flange at the tip that contributes to engagement.

The engaging portion 51b is composed of, for example, a flange protruding radially outward from the rod portion 51c. Further, when viewed in the axial direction of the rod portion 51c, the engaging portion 51b surrounds the entire circumference of the rod portion 51c (it is not necessary to surround the entire circumference). Further, when viewed in the axial direction, the shape of the outer edge of the engaging portion 51b (flange) is, for example, circular. The engaging portion 51b may or may not slide with respect to the inner surface of the support member 49 (may be separated from the inner surface of the support member 49). Although not particularly shown, the inner surface of the support member 49 may have spline grooves or ridges extending in the axial direction. The engaging portion 51b may contribute to restricting the rotation of the drive member 51 around the axis by having a convex portion inserted into the spline groove or a concave portion into which the protruding shape is inserted.

The axial position of the engaging portion 51b with respect to the rod portion 51c may be appropriately set. For example, the position of the engaging portion 51b may be a position separated rearward from the front end of the rod portion 51c. Thereby, for example, the rod portion 51c can be supported in front of the engaging portion 51b. Further, the position of the engaging portion 51b may be the rear end side with respect to the central position in the axial direction of the rod portion 51c (example in the figure), or may be the front end side with respect to the central position. .. In the former, the extrusion drive unit 47 is usually easier to shorten with respect to the stroke of the drive member 51 as compared with the latter.

In the illustrated example, the engaging portion 51b is located forward from the rear end of the rod portion 51c at a predetermined distance. This predetermined distance corresponds to the amount of insertion of the rod portion 51c into the piston 61 when the drive member 51 is located at the retreat limit. Note that, unlike the illustrated example, the engaging portion 51b may be located at the rear end of the rod portion 51c (the rod portion 51c may not be inserted into the piston 61).

Unlike the illustrated example, the engaging portion 51b may have a configuration other than the flange. For example, a step formed by making the diameter of the rear end side portion of the rod portion 51c smaller than the diameter of the front end side portion may be used as the engaging portion. As can be understood from this modification, the engaging portion that engages with the piston does not have to engage with the front end portion 49b from the rear to the front.

The stroke of the drive member 51 (from another viewpoint, the forward limit and the backward limit) may be appropriately set. For example, the forward limit may be defined by engaging the engaging portion 51b from the rear (left side of the paper) to the front with respect to the stopper (front end portion 49b in the illustrated example) provided on the support member 49. Further, for example, the retreat limit may be defined by engaging the engaging portion 51b with the piston 61 (described later) of the hydraulic drive unit 57 from the front to the rear and the piston 61 reaching the retreat limit. Further, the forward limit and / or the backward limit may be defined by the forward limit and / or the backward limit (described later) of the electric drive unit 55 in addition to or instead of the above-mentioned regulation by the engaging portion 51b. ..

(Electric drive unit of extrusion drive unit)
The electric drive unit 55 has, for example, a rotary extruder 58, a transmission mechanism 59 for transmitting the rotation of the extruder 58, and a conversion mechanism 60 for converting the rotational motion from the transmission mechanism 59 into a linear motion. There is. Then, the linear motion of the conversion mechanism 60 is transmitted to the drive member 51 to drive the drive member 51.

Although not particularly shown, the extruder 58 has a stator that constitutes one of the armature or the field, and a rotor that constitutes the other of the armature or the field. The rotor rotates about an axis with respect to the stator. The specific configuration of the extruder 58 may be appropriate. For example, the extrusion motor 58 may be a DC motor or an AC motor, an induction motor or a synchronous motor, and may or may not have a brake. The extrusion motor 58 may function as a constant speed motor provided in an open loop, or may function as a servomotor provided in a closed loop.

The arrangement position and orientation of the extruder 58 may be appropriately set. As is clear from the fact that the transmission mechanism 59 that transmits the rotation of the extruder 58 to the conversion mechanism 60 may be provided, the arrangement position and orientation of the extruder 58 are arbitrary. In the illustrated example, the extruder 58 is arranged in parallel with the conversion mechanism 60 so that the output shaft faces the rear end side (left side of the paper surface) of the drive member 51. As a result, for example, the electric drive unit 55 can be shortened. In this case, the extrusion motor 58 may be located above (illustrated example), below, or sideways with respect to the conversion mechanism 60. Further, in the illustrated example, the main body portion (stator) of the extruder 58 is fixed to the rear end portion 49c of the support member 49.

The transmission mechanism 59 is composed of, for example, a pulley / belt mechanism. Specifically, the transmission mechanism 59 includes a first pulley 59a fixed to the output shaft of the extruder 58, a second pulley 59b fixed to the screw shaft 60a (described later) of the conversion mechanism 60, and these. It has a belt 59c that is hung on a pulley. Therefore, when the extruder 58 is rotated, the rotation is input to the conversion mechanism 60 via the first pulley 59a, the belt 59c, and the second pulley 59b in this order. The transmission mechanism 59 may or may not shift gears. In the illustrated example, the diameter of the second pulley 59b is larger than the diameter of the first pulley 59a, and the transmission mechanism 59 accelerates the speed.

The transmission mechanism 59 may be another winding transmission mechanism (for example, a sprocket chain mechanism) or a mechanism other than the winding transmission mechanism (for example, a gear mechanism). The transmission mechanism may be one that changes the direction of rotation, such as a gear mechanism including a bevel gear. Further, the transmission mechanism 59 may not be provided, and the rotation of the extruder 58 may be directly input to the conversion mechanism 60. For example, the output shaft of the extruder 58 may be coaxially connected to the screw shaft 60a.

In the illustrated example, the conversion mechanism 60 is configured by a screw mechanism (for example, a ball screw mechanism or a sliding screw mechanism). The screw mechanism has a screw shaft 60a and a nut 60b screwed to the screw shaft 60a. One member of the screw shaft 60a and the nut 60b (screw shaft 60a in the illustrated example) is, for example, restricted from moving in the axial direction (left-right direction on the paper surface) with respect to the support member 49, and is allowed to rotate around the axis. There is. The other member of the screw shaft 60a and the nut 60b (nut 60b in the illustrated example) is allowed to move in the axial direction with respect to the support member 49, and rotation around the shaft is restricted. Therefore, when one of the members is rotated, the other member moves in the axial direction.

In the illustrated example, the conversion mechanism 60 is arranged so that the axial direction is parallel to the mold opening / closing direction. The screw shaft 60a as one of the members is supported by the support member 49 (moving die plate 17 from another viewpoint) so as not to be movable in the axial direction and rotatable around the axis. The nut 60b as the other member is fixed to the drive member 51 (extruded plate 43 from another viewpoint). Rotation of the nut 60b is restricted by being fixed to a member whose rotation is restricted (for example, an extrusion plate 43 and / or a drive member 51). Therefore, when the extruder 58 is rotated and the rotation is input to the screw shaft 60a, the nut 60b moves in the mold opening / closing direction, and the extrusion plate 43 is driven in the mold opening / closing direction.

The specific arrangement positions of the nut 60b and the screw shaft 60a may be appropriately set. In the illustrated example, the conversion mechanism 60 is basically housed inside the support member 49. The rear end side portion of the screw shaft 60a is supported by the rear end portion 49c of the support member 49 via a bearing. The nut 60b is located at the rear end of the drive member 51 and is concentrically with respect to the drive member 51 so that the entire nut 60b (for example, 80% or more of the axial length) is located inside the drive member 51. Have been placed. The drive member 51 has a position (FIG. 3) for accommodating at least a part of the screw shaft 60a (for example, 80% or more of the axial length of the portion where the thread groove is cut) due to the movement of the nut 60b, and a screw. It is movable to and from a reduced length position (FIG. 5) that accommodates the shaft 60a. In other words, the drive member 51 is provided concentrically with respect to the conversion mechanism 60. With such an arrangement, for example, the extrusion drive unit 47 is miniaturized.

The stroke of the nut 60b (in another aspect, the forward limit or the backward limit) is defined by, for example, the length of the range in which the thread groove is cut in the screw shaft 60a in the conversion mechanism 60 alone. This stroke (drive limit) may or may not specify the forward limit or the backward limit of the extrusion pin 41. From another point of view, the conversion mechanism 60 may or may not be used at full stroke.

Although not particularly shown, the nut 60b may rotate to drive the screw shaft 60a in the axial direction. The drive member 51 may be provided coaxially with the conversion mechanism 60 instead of concentrically. Instead of the screw mechanism, another conversion mechanism (for example, a rack and pinion mechanism or a link mechanism) may be provided.

(Hydraulic drive unit of extrusion drive unit)
The hydraulic pressure drive unit 57 is composed of, for example, a hydraulic pressure cylinder. In the description of the embodiment, the term of the hydraulic drive unit 57 may be used as a term to refer to this hydraulic cylinder (extrusion cylinder). Specifically, the hydraulic pressure drive unit 57 has, for example, a support member 49 as a cylinder portion and a piston 61 slidable in the support member 49 in the axial direction thereof.

The piston 61 divides the inside of the support member 49 into a front chamber 49d on the distal end side (on the right side of the paper in the illustrated example) and a rear chamber 49e on the opposite side thereof. By supplying the hydraulic fluid to the rear concubine 49e, the piston 61 can be moved to the side of the front concubine 49d. Unlike a general hydraulic cylinder, the front chamber 49d is open to the atmosphere. That is, the front concubine 49d is not used to move the piston 61 toward the rear concubine 49e.

As described above, the drive member 51 has an engaging portion 51b. The engaging portion 51b is located in the front concubine 49d and can be engaged with the piston 61 from the front (right side of the paper) to the rear. Therefore, in a state where the engaging portion 51b is not engaged with the piston 61, the drive member 51 can be moved while the piston 61 is stopped. Further, for example, the driving member 51 can be moved forward by driving the piston 61 toward the front chamber 49d while the engaging portion 51b is engaged with the piston 61. Further, for example, the piston 61 is moved to the rear side chamber 49e by moving the drive member 51 rearward (on the left side of the paper) by the electric drive unit 55 while the engaging portion 51b is engaged with the piston 61. Can be made to.

The piston 61 has a through hole 61h through which a fluid (for example, a gas) can flow, unlike a piston of a general hydraulic cylinder. The through hole 61h penetrates the center of the piston 61 in the axial direction (mold opening / closing direction). The piston 61 divides the inside of the support member 49 as a cylinder portion into an axial center side portion 49f including a through hole 61h and a cylinder chamber (more specifically, a rear side chamber 49e) on the outer peripheral side of the piston 61 (more specifically, the rear side chamber 49e). From another point of view, it contributes to sealing the rear concubine 49e). The axial center side portion 49f is open to the atmosphere. That is, the piston 61 contributes to using only the outer peripheral side portion of the inside of the support member 49 as the cylinder chamber. As a result, for example, the drive member 51 can be separated from the piston 61, unlike the piston rod of a general hydraulic cylinder. Further, for example, a part of the electric drive unit 55 (conversion mechanism 60 in the illustrated example) is not immersed in the hydraulic fluid, but is inside the support member 49 (in another viewpoint, in the axial center side portion 49f or in the through hole 61h). Can be placed.

The specific configuration for partitioning the axial center side portion 49f and the rear side chamber 49e by the piston 61 may be appropriate. Although not particularly designated, in the illustrated example, the piston 61 has a shape having a main body portion and a protruding portion having a diameter smaller than that of the main body portion and projecting rearward. Further, the support member 49 has a first inner surface on which the main body of the piston 61 slides, and a second inner surface on which the protruding portion of the piston 61 slides with a smaller diameter than the first inner surface. There is. As a result, a closed rear chamber 49e is formed between the first inner surface and the outer peripheral surface of the protruding portion. In the illustrated example, the second inner surface is composed of the rear end portion 49c of the support member 49. However, the second inner surface may be formed by the tubular portion 49a.

As described above, the hydraulic pressure drive unit 57 may be configured so that the piston 61 can be moved rearward by supplying hydraulic pressure, unlike the illustrated example. In this case, although not particularly shown, a cylinder chamber sealed in front of the main body portion may be formed by forming a protruding portion protruding forward from the main body portion in the piston 61, and the hydraulic fluid may be contained in this cylinder chamber. May be supplied.

The stroke St0 (FIG. 3) of the piston 61 is defined by forming a stopper having an appropriate shape inside the support member 49. In the illustrated example, the retracting limit of the piston 61 (driving limit on the left side of the paper) is defined by the rear end 49c as a stopper, as shown in FIG. As shown in FIGS. 4 and 5, the forward limit (drive limit on the right side of the paper) of the piston 61 is defined by a stopper (reference numeral omitted) configured by reducing the inner diameter of the support member 49.

The stroke St0 of the piston 61 is, for example, only a part of the rear part (left side of the paper surface) of the stroke of the drive member 51 and the stroke of the electric drive unit 55. For example, the length of the former may be 1/2 or less, 1/5 or less, or 1/10 or less of the length of the latter. Note that, unlike the illustrated example, the stroke St0 may coincide with the stroke of the drive member 51 or the stroke of the electric drive unit 55.

As can be understood from the above description, in the support member 49, the tubular portion 49a and the rear end portion 49c are fixed so as to seal the rear concubine 49e. On the other hand, the tubular portion 49a and the front end portion 49b do not have to be fixed in such a manner. The front chamber 49d may be opened to the atmosphere by an appropriate method. For example, the port may be formed at an appropriate position, or may be opened to the atmosphere simply by a gap between the tubular portion 49a and the front end portion 49b or a gap between the driving member 51 and the front end portion 49b.

A packing such as an O-ring may be provided between the piston 61 and the support member 49 in order to improve the airtightness of the rear side chamber 49e. For example, when the piston 61 slides on the support member 49, the two may not be in direct contact with each other due to the packing interposed between the two. The same applies to other members.

(Core device)
Returning to FIG. 1, the mounting position of the core device 13 may be above (illustrated example), below, or sideways with respect to the fixed type 103 or the mobile type 105. Further, the moving direction of the core 109 may be any of a vertical direction (illustrated example), a horizontal direction, and a direction inclined with respect to these directions when viewed in the mold opening / closing direction. However, the following description may be performed on the premise that the core device 13 is located above the mobile type 105 and the core 109 is driven in the vertical direction, as shown in the illustrated example, for convenience.

The core device 13 is fixed to one of the fixed type 103 and the mobile type 105 (movable type 105 in the illustrated example) by, for example, the mounting portion 65. The configuration of the mounting portion 65 may be various configurations including a known configuration. In the illustrated example, the mounting portion 65 has a rod-shaped member extending upward from the upper surface of the mobile type 105. The core device 13 is fixed to the upper end of the rod-shaped member.

6 to 8 are cross-sectional views showing the configuration of the core device 13. It should be noted that these figures also show a partial configuration of the hydraulic pressure device 67 that supplies the hydraulic fluid to the core device 13. In these figures, the vertical direction of the paper surface corresponds to the vertical direction of the paper surface of FIG. FIG. 4 shows a state when the core 109 is retracted from between the fixed type 103 and the mobile type 105. FIG. 5 shows a state when the core 109 is inserted between the fixed type 103 and the mobile type 105. FIG. 6 shows an initial state when the core 109 is retracted from between the fixed type 103 and the mobile type 105.

The core device 13 includes a support member 69 fixed to the movable mold 105 by the mounting portion 65, and a drive member 71 driven in the moving direction (vertical direction in the illustrated example) of the core 109 with respect to the support member 69. have. The tip (lower end in the illustrated example) of the drive member 71 is a connecting portion 71a connected to the core 109.

The configuration of the core device 13 is similar to that of the extrusion drive unit 47. That is, the core device 13 has a hybrid drive unit including an electric drive unit 73 and a hydraulic pressure drive unit 75 in order to drive the drive member 71 with respect to the support member 69. Further, in both the core device 13 and the extrusion drive unit 47, the stroke of the hydraulic pressure drive unit corresponds to only a part of the stroke of the drive member 51. However, in the extrusion drive unit 47, the hydraulic pressure drive unit 57 is configured to drive the drive member 51 forward from the retreat limit (or its vicinity), whereas in the core device 13, the liquid is liquid. The pressure drive unit 75 is configured to drive the drive member 71 backward from the forward limit (or its vicinity). Specifically, it is as follows.

In the following description, the differences from the extrusion drive unit 47 of the core device 13 will be mainly described. Matters not particularly mentioned about the core device 13 may be the same as those of the extrusion drive unit 47, or may be inferred from the description of the extrusion drive unit 47.

The description of the extrusion drive unit 47 may be applied to the core device 13 except for the differences described below and as long as there is no contradiction or the like. At this time, the terms of the extrusion drive unit 47, the support member 49, and the drive member 51 are replaced with the terms of the core device 13, the support member 69, and the drive member 71. The terms tubular portion 49a, front end portion 49b, rear end portion 49c, front side chamber 49d, and rear side chamber 49e in the support member 49 refer to the tubular portion 69a, front end portion 69b, rear end portion 69c, and front end portion 69c in the support member 69. Substitute the terms concubine 69d and posterior chamber 69e. The terms of the connecting portion 51a, the engaging portion 51b, and the rod portion 51c in the drive member 51 are replaced with the terms of the connecting portion 71a, the engaging portion 71b, and the rod portion 71c in the drive member 71. The terms of the electric drive unit 55 and the hydraulic drive unit 57 are replaced with the terms of the electric drive unit 73 and the hydraulic drive unit 75. The terms of the extrusion motor 58, the transmission mechanism 59 and the conversion mechanism 60 in the electric drive unit 55 are replaced with the terms of the core motor 76, the transmission mechanism 77 and the conversion mechanism 79 in the electric drive unit 73. The terms of the first pulley 59a, the second pulley 59b and the belt 59c in the transmission mechanism 59 are replaced with the terms of the first pulley 77a, the second pulley 77b and the belt 77c in the transmission mechanism 77. The terms screw shaft 60a and nut 60b in the conversion mechanism 60 are replaced with the terms screw shaft 79a and nut 79b in the conversion mechanism 79. The terms piston 61 and stroke St0 in the hydraulic drive unit 57 are replaced with the terms piston 81 and stroke St1 in the hydraulic drive unit 75. The right side of the paper surface and the left side of the paper surface in the description of the extrusion drive unit 47 are replaced with the lower side of the paper surface and the upper side of the paper surface in the description of the core device 13.

The configuration of the support member 69 of the core device 13 is substantially the same as the configuration of the support member 49 of the extrusion drive unit 47. However, of the support member 49, the portion that is truly used as the cylinder portion is only a part on the rear end side, whereas the portion of the support member 69 that is truly used as the cylinder portion is It is only a part of the front end side. Therefore, the support member 69 is sealed at the front end side portion. In other words, the rear end side portion of the support member 69 may be open to the atmosphere without being sealed.

The configuration of the drive member 71 of the core device 13 is substantially the same as the configuration of the drive member 51 of the extrusion drive unit 47. However, the connecting portion 71a of the driving member 71 is configured according to the connecting mode with the core 109. Further, since the piston 81 is located on the front side portion of the support member 69, the rod portion 71c of the drive member 71 is always slidably inserted into the piston 81, and the hydraulic fluid is supplied. It contributes to the sealing of the front chamber 69d. A packing may be interposed between the rod portion 71c and the piston 81. Further, in the extrusion drive unit 47, the engaging portion 51b is located in front of the rear end of the rod portion 51c in order to insert the rear end side portion of the rod portion 51c into the piston 61. In the core device 13, the engaging portion 71b is located at the rear end of the rod portion 71c. In the illustrated example, the engaging portion 71b is separated from the inner surface of the support member 69, but the engaging portion 71b may slide on the inner surface of the support member 69.

The stroke of the drive member 71 of the core device 13 (from another viewpoint, the forward limit and the backward limit) may be appropriately set in the same manner as the stroke of the drive member 51 of the extrusion drive unit 47. However, the piston 81 of the core device 13 is located in front of the piston 61 of the extrusion drive unit 47, as opposed to the piston 61. Therefore, in the extrusion drive unit 47, the retreat limit of the piston 61 could define the retreat limit of the drive member 51, whereas in the core device 13, the forward limit of the piston 81 defines the forward limit of the drive member 71. Can be.

The electric drive unit 73 of the core device 13 is substantially the same as the electric drive unit 55 of the extrusion drive unit 47, and there is no particular difference. However, since the objects to be driven by the two are different, naturally, the specific configuration (for example, the performance of the motor, the speed increase ratio of the transmission mechanism, the lead length of the conversion mechanism, etc.) may be different between the two.

The hydraulic pressure drive unit 75 of the core device 13 is composed of a hydraulic pressure cylinder, similarly to the hydraulic pressure drive unit 57 of the extrusion drive unit 47. In the description of the embodiment, the term of the hydraulic drive unit 75 may be used as a term to refer to the hydraulic cylinder (core cylinder). Similar to the piston 61 of the hydraulic drive unit 57, the piston 81 of the hydraulic pressure drive unit 75 has the inside of the support member 69 as a cylinder portion in front (lower in the illustrated example) of the front concubine 69d and the opposite side thereof. It is divided into a rear chamber 69e.

However, in the hydraulic drive unit 75 of the core device 13, the piston 81 is on the rear side chamber 69e side by supplying the hydraulic fluid to the front side chamber 69d, contrary to the hydraulic pressure drive unit 57 of the extrusion drive unit 47. Driven to. The rear side chamber 69e of the hydraulic pressure drive unit 75 is open to the atmosphere like the front side chamber 49d of the hydraulic pressure drive unit 57. That is, the rear concubine 69e is not used to move the piston 81 toward the front concubine 69d. Further, the piston 81 of the core device 13 is different from the piston 61 of the extrusion drive unit 47 (from another viewpoint, like the piston of a normal hydraulic cylinder), and the inside of the support member 69 as the cylinder portion is the axis. It is not divided into a side part and an outer peripheral side part.

In the extrusion drive unit 47, the engagement portion 51b of the drive member 51 engages with the piston 61 from the front (connecting portion 51a side) to the rear. In the core device 13, the engaging portion 71b of the drive member 71 engages with the piston 81 from the rear to the front (in the opposite direction to the above). Then, for example, the driving member 71 is moved rearward (upward in the illustrated example) by driving the piston 81 toward the rear side chamber 69e while the engaging portion 71b is engaged with the piston 81. Can be done. Further, for example, in a state where the engaging portion 71b is engaged with the piston 81, the driving member 71 is moved forward (downward in the illustrated example) by the electric driving portion 73, whereby the piston 81 is moved to the front chamber 69d. Can be moved to the side.

(Hydraulic device)
FIG. 9A is a circuit diagram showing an example of the configuration of the hydraulic device 67 that supplies the hydraulic fluid to the extrusion device 11 (more specifically, the rear chamber 49e of the hydraulic pressure drive unit 57).

The hydraulic pressure device 67 also supplies the hydraulic fluid to the core device 13 (more specifically, the front chamber 69d of the hydraulic pressure drive unit 75). That is, at least a part of the hydraulic pressure device 67 is shared by the extruder device 11 and the core device 13.

The hydraulic pressure device 67 has a pump 89 as a hydraulic pressure source 83 (reference numeral is FIG. 3 to FIG. 8) for delivering the hydraulic fluid, and a tank 85 for storing the hydraulic fluid. These elements are shared by the extruder 11 and the core device 13. The hydraulic pressure device 67 includes an extrusion valve 91 that controls the flow of the hydraulic fluid between the element (83, 85) and the extrusion device 11 (rear side chamber 49e), and the element and the core device 13 (front chamber 69d). ) And a core valve 87 that controls the flow of the hydraulic fluid.

The pump 89 may be a rotary pump that discharges the hydraulic fluid by the rotation of the rotor, or may be a plunger pump that discharges the hydraulic fluid by the reciprocation of the piston. The pump 89 may be configured by a constant-capacity pump in which the discharge amount in one cycle of the rotor or the piston is fixed, or may be configured by a variable-capacity pump in which the discharge amount is variable. Further, although it is sufficient that the pump 89 can discharge the hydraulic fluid in one direction, the structure may be the same as that of the bidirectional (two-way) pump.

The pump 89 is driven by, for example, a rotary pump motor 93. The pump motor 93 may be a DC motor, an AC motor, an induction motor, or a synchronous motor. The pump motor 93 may function as a constant speed motor provided in an open loop, or may function as a servomotor provided in a closed loop. The pump motor 93 (pump 89) is driven, for example, only when necessary (eg, when the hydraulic fluid is supplied to the rear side chamber 49e or the front side chamber 69d). This reduces energy consumption. However, the pump motor 93 may be constantly driven.

The tank 85 is, for example, an open tank. That is, the tank 85 holds the hydraulic fluid under atmospheric pressure. Thus, for example, when the rear concubine 49e or the front concubine 69d is connected to the tank 85, the pressure in these cylinder chambers drops to atmospheric pressure or near atmospheric pressure.

The extrusion valve 91, for example, allows and prohibits the flow of the hydraulic fluid from the hydraulic pressure source 83 (here, the pump 89) to the rear side chamber 49e, and allows and prohibits the flow of the hydraulic fluid from the rear side chamber 49e to the tank 85. And do. The specific configuration of the extrusion valve 91 may be various configurations including known configurations. The extrusion valve 91 may be composed of two or more valves. In the illustrated example, the extrusion valve 91 is composed of a switching valve at three ports and two positions, and one of the hydraulic pressure source 83 and the tank 85 is selectively connected to the rear concubine 49e. The drive system is, for example, a solenoid that moves the valve body against the force of a spring. The extrusion valve 91 may have a function of controlling the flow rate.

The core valve 87, for example, allows and prohibits the flow of the hydraulic fluid from the hydraulic pressure source 83 to the front chamber 69d, and allows and prohibits the flow of the hydraulic fluid from the front chamber 69d to the tank 85. The specific configuration of the core valve 87 may be various configurations including known configurations. The core valve 87 may be composed of two or more valves. In the illustrated example, the core valve 87 is composed of a switching valve at 3 ports and 2 positions, and one of the hydraulic pressure source 83 and the tank 85 is selectively connected to the front chamber 69d. The drive system is, for example, a solenoid that moves the valve body against the force of a spring. The core valve 87 may have a function of controlling the flow rate.

As shown in FIG. 2, the hydraulic device 67 may be entirely mounted (supported) on the moving die plate 17. In FIG. 2, among the hydraulic pressure devices 67, the unit 67a and the flow path 67b connecting the unit 67a and the rear concubine 49e are schematically shown.

The unit 67a includes, for example, all components other than the flow path of the hydraulic device 67. The components are, for example, a pump 89, a pump motor 93, a tank 85, an extrusion valve 91, and a core valve 87, as described above. These components are, for example, grouped together in one place and unitized to form a unit 67a. However, these components may be appropriately dispersed and arranged with respect to the moving die plate 17 without being unitized.

The placement position of the unit 67a (or the above-mentioned components to be distributedly arranged; the same shall apply in this paragraph) may be appropriately set. In the illustrated example, the unit 67a is located below the back surface of the moving die plate 17. However, the unit 67a may be located on the side or upper side of the back surface of the moving die plate 17, or may be located on the upper surface or the side surface of the moving die plate 17. The method of fixing the unit 67a to the moving die plate 17 may be an appropriate method such as one using screws or the like.

The flow path 67b connects the extrusion valve 91 and the rear chamber 49e of the extrusion device 11. In the embodiment in which the cylinder portion (support member 69) of the extruder 11 is fixed to the moving die plate 17 as in the present embodiment, the rear side chamber 49e and the moving die plate 17 do not move relative to each other. Therefore, the flow path 67b may be composed of a member (for example, a pipe or a block) whose entire flow path can be regarded as a rigid body. Of course, the flow path 67b may be at least partially composed of a flexible member (for example, a hose).

Although not shown in FIG. 2, a flow path 67c (FIG. 9 (a)) connecting the unit 67a (valve for core) and the front chamber 69d of the core device 13 is also provided. The core device 13 is supported by a mobile die plate 17 (via a mobile die 105), and the front chamber 69d does not move relative to the mobile die plate 17. Therefore, like the flow path 67b, the flow path 67c may be composed of a member that can be regarded as a rigid body as a whole, or may be composed of a member having at least a part of flexibility.

(Modification example of hydraulic device)
FIG. 9B is a circuit diagram showing the configuration of the hydraulic pressure device 67A according to the modified example. In addition, here, basically, only the difference from the hydraulic pressure device 67 will be described. Matters not particularly mentioned may be the same as those of the hydraulic pressure device 67, or may be inferred from the hydraulic pressure device 67.

In the hydraulic pressure device 67A, the hydraulic pressure source 83 is an accumulator 95. The pump 89 is used, for example, to fill the accumulator 95. Alternatively, the accumulator 95 to the cylinder chambers (49e and 69d) may be basically a closed space, and the pump 89 may be used to compensate for the leakage of the hydraulic fluid in the space. The accumulator 95 may be composed of an appropriate type accumulator such as a weight type, a spring type, a gaseous pressure type (including a pneumatic type), a cylinder type, and a Prada type. For example, the accumulator 95 is a gas pressure type, cylinder type or Prada type accumulator, and the gas (for example, air or nitrogen) held in the accumulator 95 is compressed to accumulate pressure.

A valve 97 may be provided between the pump 89 and the accumulator 95 to reduce the probability that the hydraulic fluid will flow back from the accumulator 95 to the pump 89. The configuration of the valve 97 may be appropriate. In the illustrated example, the valve 97 is a check valve that allows the flow of hydraulic fluid from the pump 89 to the accumulator 95 and prohibits the flow in the opposite direction.

(Sensors, etc.)
Although not particularly shown, the die casting machine 1 may have various sensors so that the control device 5 can control the operation of the machine body 3. Then, the control device 5 may control the mold clamping device 7, the injection device 9, the extrusion device 11, the core device 13, and the like based on the detection values of various sensors.

An example of the sensor as described above is given. For example, a position sensor may be provided to detect the position of the drive member 51 of the extruder 11 with respect to the support member 49 (in another viewpoint, the position of the extrusion pin 41 with respect to the movable type 105). Specific embodiments of the position sensor include, for example, a linear encoder or a laser length measuring instrument. In addition to or in place of the position sensor that detects the position of the drive target (drive member 51), a sensor at the drive source may be provided. Examples of such a sensor include a sensor (for example, an encoder or a resolver) that detects the rotation of the extruder 58. Further, a sensor capable of detecting the driving force generated by the driving source may be provided. Examples of such a sensor include a sensor that detects the torque of the extruder 58 and a sensor that detects the pressure in the cylinder chamber of the hydraulic cylinder.

(Operation of extruder 11)
The operation of the extruder 11 is, for example, as follows.

As described above, the molded material in the molten state is injected by the injection device 9 into the cavity 107 of the mold 101 that has been molded by the mold clamping device 7. Then, the molding material in the cavity 107 solidifies to produce a molded product.

While the molding material is injected and solidified, the extruder 11 is in the state shown in FIG. Specifically, the relative position of the extrusion pin 41 with respect to the movable type 105 is set to the initial position. The initial position may be, for example, a position where the tip of the extrusion pin 41 coincides with the inner surface of the cavity 107, and / or a recession limit of the extrusion pin 41 with respect to the mobile 105, as described above. The drive member 51 is located, for example, in the retreat limit with respect to the support member 49. That is, the drive member 51 is engaged from the front to the rear with respect to the piston 61, and the piston 61 is located at the retreat limit with respect to the support member 49. The nut 60b is located at or near the retreat limit with respect to the screw shaft 60a.

In this state, the control device 5 has stopped supplying the hydraulic fluid from the hydraulic pressure device 67 to the hydraulic pressure drive unit 57 (rear side chamber 49e), for example. More specifically, for example, the control device 5 has stopped the pump motor 93 and / or prohibited the supply of the hydraulic fluid to the rear concubine 49e by the extrusion valve 91 (the rear concubine 49e is the tank 85). Is connected to). Further, the control device 5 stops the extrusion motor 58 of the electric drive unit 55. The stopped state may be a torque-free state, a state in which the brake is functioning, or a state in which the position control for maintaining the stop is performed.

When the control device 5 determines that the molding material in the cavity 107 has solidified, the control device 5 controls the mold clamping device 7 so that the mold opening (moving the moving die plate 17 in the mold opening direction from another viewpoint) is performed. Due to the mold opening, the molded product moves with the mobile mold 105 and separates from the fixed mold 103.

During the mold opening or after the mold opening is completed, the control device 5 performs the initial operation of extrusion as shown in FIG. The initial operation of extrusion requires a large driving force as compared to the subsequent operation of extrusion. This is because, for example, a force for peeling (releasing) the molded product that was in close contact with the mobile mold 105 from the mobile mold 105 is required. In the initial operation of extrusion, the control device 5 drives the extrusion pin 41 by, for example, both the hydraulic drive unit 57 and the electric drive unit 55. As a result, a large driving force can be obtained as compared with the case where either one of the driving units is used. Specifically, it is as follows.

The control device 5 controls the hydraulic pressure device 67 so that the hydraulic fluid is supplied from the hydraulic pressure source 83 to the rear side chamber 49e. The start of the supply of the hydraulic fluid may be made by starting the drive of the pump motor 93 and / or by connecting the rear chamber 49e of the extrusion valve 91 to the hydraulic pressure source 83.

By supplying the hydraulic fluid to the rear concubine 49e, the piston 61 moves relative to the support member 49 forward (toward the connecting portion 51a), and the drive member 51 engaged with the piston 61 eventually moves to the support member 49. On the other hand, it moves relative to the front. Further, in parallel with the above, the control device 5 rotates the extruder 58 in the rotation direction corresponding to the relative movement of the nut 60b forward with respect to the screw shaft 60a (support member 49). As a result, the drive member 51 fixed to the nut 60b moves relative to the support member 49 forward. By the relative movement of the drive member 51 with respect to the support member 49 as described above, the extrusion plate 43 moves relative to the moving die plate 17 in the mold closing direction. As a result, both the hydraulic drive unit 57 and the electric drive unit 55 drive the extrusion pin 41 toward the fixed mold 103 with respect to the mobile mold 105.

When supplying the hydraulic fluid to the rear chamber 49e, the control device 5 may, for example, use a hydraulic pressure device 67 (for example, a pump motor) based on a detection value of a force sensor (not shown) for detecting the force applied to the molded product by the extrusion pin 41. 93 or the flow control valve) and the pressure control to control the extrusion motor 58 may be performed, and / or the hydraulic pressure is based on the detection value of the position sensor (not shown) that detects the position of the extrusion pin 41 with respect to the movable type 105. Position control and / or speed control may be performed to control the device 67 (for example, the pump motor 93 or the flow control valve) and the extrusion motor 58.

The driving force applied to the driving member 51 by the hydraulic pressure driving unit 57 and the driving force applied to the driving member 51 by the electric driving unit 55 may be larger, and the difference may be appropriately set. For example, the former may be 2 times or more, 1 time or more, 1/2 or more, or less than 1/2 with respect to the latter.

When the predetermined condition is satisfied, the control device 5 controls the hydraulic pressure device 67 so as to stop the supply of the hydraulic fluid to the rear side chamber 49e, and ends the driving of the extrusion pin 41 by the hydraulic pressure drive unit 57. The supply of the hydraulic fluid may be stopped by stopping the pump motor 93 and / or by operating the extrusion valve 91 that shuts off the rear chamber 49e from the hydraulic pressure source 83. Further, the piston 61 may come into contact with the stopper provided on the support member 49 (at the advance limit) and stop at the same time as or before the stop of the supply of the hydraulic fluid.

The above-mentioned predetermined condition when the supply of the hydraulic fluid to the rear concubine 49e is stopped is that, for example, the amount of movement of the extruded pin 41 (molded article from another viewpoint) detected by a position sensor (not shown) is a predetermined target movement. It may be considered that the amount has been reached or that the force applied to the extrusion pin 41 detected by the force sensor (not shown) has fallen below a predetermined threshold. As a result of stopping under the latter condition, the above target movement amount may be obtained.

Next, the rest of the extrusion operation is performed, as shown in FIG. In the remaining operation of the extrusion, for example, the extrusion pin 41 is driven only by the electric drive unit 55 among the hydraulic pressure drive unit 57 and the electric drive unit 55. This reduces, for example, energy consumption. Specifically, it is as follows.

Following the initial operation of extrusion, the control device 5 rotates the extrusion motor 58 in the rotation direction corresponding to the relative movement of the drive member 51 forward with respect to the support member 49. As a result, the extrusion pin 41 moves relative to the movable mold 105 toward the fixed mold 103. As a result, the molded product is further separated from the mobile 105. At this time, the control device 5 may perform position control and / or speed control for controlling the extrusion motor 58 based on the position of the extrusion pin 41 with respect to the movable type 105 detected by a position sensor (not shown), for example. The control of the electric drive unit 55 may be the same or may change depending on whether the control is in cooperation with the hydraulic drive unit 57 or not.

The piston 61 is not fixed to the drive member 51 and engages from the rear to the front. That is, the drive member 51 is allowed to move forward relative to the piston 61. Therefore, when the drive member 51 is driven forward with respect to the support member 49 by the extrusion motor 58 as described above, the piston 61 can stay without moving relative to the support member 49. As a result, in the late operation of extrusion, the volume of the rear concubine 49e does not increase, and it is not necessary to replenish the hydraulic fluid to the rear concubine 49e.

After that, when a predetermined condition is satisfied, the control device 5 stops driving the extrusion motor 58. The predetermined condition may be, for example, that the movement amount of the extrusion pin 41 (molded article) detected by a position sensor (not shown) has reached a predetermined target movement amount. At the same time as or before the control to stop the extrusion motor 58, the extrusion pin 41 (extrude plate 43 and / or the drive member 51 from another viewpoint) may reach the drive limit and stop. In other words, the target movement amount may be obtained as a result of the extrusion pin 41 reaching the drive limit and stopping.

The amount of movement of the extrusion pin 31 in the initial operation (referred to as the first movement amount in this paragraph) and the amount of movement of the extrusion pin 31 in the subsequent operation (referred to as the second movement amount in this paragraph) are referred to as each other. It may be set as appropriate. For example, the movement related to the first movement amount may be mainly intended to separate the molded product 111, which is in close contact with the mobile mold 105, from the mobile mold 105. In this case, the first movement amount may be shortened as much as possible. For example, the first movement amount may be 5 mm or less. On the other hand, the movement related to the second movement amount may be mainly intended to secure a distance from the moving mold 105 of the molded product. By ensuring the distance, for example, it is easy to take out the molded product by a device (not shown). The first movement amount may be shorter than, for example, the second movement amount, and may be 1/2 or less, 1/5 or less, or 1/10 or less of the second movement amount.

After extrusion, the extrusion pin 41 is returned to the initial position. In other words, the preparation for the next cycle is made.

Specifically, the control device 5 rotates the extruder 58 in a rotation direction corresponding to the relative movement of the drive member 51 to the rear (opposite to the connecting portion 51a) with respect to the support member 49, for example. As a result, the extrusion pin 41 moves toward the initial position.

The drive member 51 engages with the piston 61 in the process of moving backward. Then, the piston 61 moves rearward with respect to the support member 49 together with the drive member 51. After that, the drive member 51 and the piston 61 reach the initial position (for example, the retreat limit) shown in FIG.

When the piston 61 moves rearward with respect to the support member 49, the hydraulic fluid discharged from the rear concubine 49e whose volume is reduced is discharged to, for example, the tank 85. When the hydraulic pressure source 83 is the accumulator 95, at least a part of the hydraulic fluid discharged from the rear side chamber 49e may be filled in the accumulator 95.

The control device 5 moves to the initial position of the extrusion pin 41 by, for example, a position sensor (not shown) that detects the relative position of the extrusion pin 41 with respect to the movable type 105 (in another viewpoint, the relative position of the drive member 51 with respect to the support member 49). Detects the return of. Then, when the control device 5 detects the return to the initial position, the extrusion motor 58 is stopped.

(Operation of core device)
The operation of the core device 13 is, for example, as follows.

Before the start of mold closing, the drive member 71 (nut 79b in another aspect) is located in the retracted limit (upper drive limit in the illustrated example), for example, as shown in FIG. As a result, the core 109 is retracted from between the fixed type 103 and the mobile type 105. Since the piston 81 is not involved in the positioning of the drive member 71 located at the retreat limit, it may be in an appropriate position. In another aspect, the anterior chamber 69d may be connected to either the hydraulic pressure source 83 or the tank 85. In the illustrated example, the piston 81 is located in the retreat limit. Further, the front chamber 69d is connected to the tank 85.

Before the mold closing is completed (for example, before the mold closing is started or the mold is being closed), the control device 5 drives the core motor 76 to move the drive member 71 to the forward limit as shown in FIG. 7. As a result, the core 109 is arranged between the fixed type 103 and the mobile type 105. Further, during the movement of the drive member 71 to the forward limit, the engaging portion 71b of the drive member 71 engages with the piston 81 from the rear. As a result, the driving force of the core motor 76 is applied to the piston 81, and the piston 81 also moves to the forward limit. At this time, the hydraulic fluid in the front chamber 69d is discharged to the tank 85 via the core valve 87.

At least a part of the hydraulic fluid in the front chamber 69d may be supplied to the accumulator 95 as the hydraulic pressure source 83. Further, the drive member 71 may be stopped at a desired position based on the detection value of the sensor that detects the position of the drive member 71, and the drive member 71 may not be moved to the forward limit.

After that, when the mold clamping and injection are completed and the molding material in the cavity 107 is solidified, the mold is opened and further extruded. After the start of mold opening (for example, during mold opening or after the completion of mold opening) and before extrusion, the control device 5 causes the electric drive unit 73 to retract the core 109 from between the fixed mold 103 and the mobile mold 105. And the hydraulic pressure drive unit 75 is controlled.

Specifically, first, as shown in FIG. 8, the control device 5 sets the core valve 87 (and / or the hydraulic pressure source 83) so as to supply the hydraulic fluid from the hydraulic pressure source 83 to the front chamber 69d. Control. As a result, the piston 81 moves to the rear chamber 69e side. Since the drive member 71 is engaged with the piston 81 from the rear, the drive member 71 moves rearward (upward in the illustrated example) as the piston 81 moves to the rear chamber 69e. As a result, the core 109 starts moving in the direction of retracting from between the fixed mold 103 and the mobile mold 105, and separates from the molded product.

When the piston 81 is driven by the hydraulic pressure drive unit 75 as described above, the electric drive unit 73 (core motor 76) generates, for example, a driving force for moving the drive member 71 backward together with the hydraulic pressure drive unit 75. good. In this case, either the driving force applied to the driving member 71 by the hydraulic pressure driving unit 75 or the driving force applied to the driving member 71 by the electric driving unit 73 may be larger, and the difference is appropriately set. good. For example, the former may be 2 times or more, 1 time or more, 1/2 or more, or less than 1/2 with respect to the latter. Further, the electric drive unit 73 hardly applies a rearward driving force to the drive member 71, and the inertial force and frictional resistance of the electric drive unit 73 hinder the drive of the drive member 71 by the hydraulic drive unit 75. The nut 79b may be moved at an appropriate speed so as not to become. Further, depending on the configuration of the conversion mechanism 79, the core motor 76 may be in a torque-free state.

When the piston 81 moves to the backward limit, the control device 5 continues or starts the control of applying the driving force to the rear (upward in the illustrated example) to the driving member 71 by the electric driving unit 73, and the driving member 71 is started. To the retreat limit. As a result, the core 109 continues to retreat and retreats from between the fixed type 103 and the mobile type 105. When the driving force is applied to the driving member 71 by the electric driving unit 73 even when the driving force is applied to the driving member 71 from the hydraulic pressure driving unit 75, the piston 81 retreats to control the electric driving unit 73. It may be the same or may change before and after reaching the limit.

As described above, since the core device 13 is a hybrid type, it is easy to apply a large force to the core 109, for example, when the core 109 is separated from the molded product. This is because, for example, the hydraulic drive unit 75 used when separating the core 109 from the molded product can easily obtain a larger force than the electric drive unit 73, and / or the core 109. This is because the hydraulic drive unit 75 and the electric drive unit 73 can cooperate with each other when the product is separated from the molded product. On the other hand, after the core 109 is separated from the molded product, energy consumption can be saved by using only one of the hydraulic drive unit 75 and the electric drive unit 73 (for example, the electric drive unit 73). ..

Further, in the core device 13, the stroke of the piston 81 is only a part of the stroke on the tip end side (connecting portion 71a side) of the drive member 71 by the electric drive portion 73. Thereby, for example, when the core 109 is separated from the molded product, a large driving force can be obtained by utilizing the hydraulic pressure driving unit 75. On the other hand, the amount of the hydraulic fluid supplied to the front chamber 69d can be reduced. As a result, the hydraulic pressure device 67 can be miniaturized.

As described above, the extrusion device 11 according to the present embodiment drives the extrusion pin 41 inserted in the mold opening / closing direction with respect to one of the fixed mold 103 and the mobile mold 105 (the mobile mold 105 in the present embodiment). It is something to do. The extrusion device 11 has a first member (support member 49), a second member (drive member 51), a hydraulic pressure drive unit 57, and an electric drive unit 55. The support member 49 is fixed to one member (moving die plate 17 in this embodiment) of the extrusion plate 43 and the die plate (moving die plate 17). The drive member 51 is fixed to the extruded plate and the other member of the die plate (extruded plate 43 in this embodiment). The extrusion plate 43 is located in the space 105s formed by the die base 105a of the mobile type 105 and is fixed to the extrusion pin 41. The moving die plate 17 holds one of the above molds through which the extrusion pin 41 is inserted. Both the hydraulic pressure drive unit 57 and the electric drive unit 55 drive the drive member 51 with respect to the support member 49.

From another viewpoint, the molding machine (die casting machine 1) according to the present embodiment has the extrusion device 11 as described above, the mold clamping device 7, and the injection device 9. The mold clamping device 7 has a fixed die plate 15 for holding the fixed mold 103 and a moving die plate 17 for holding the mobile mold 105. The injection device 9 injects the molding material into the cavity 107 composed of the mobile type 105 and the fixed type 103.

Therefore, a new extrusion device 11 (die casting machine 1) for driving the extrusion plate 43 located in the space 105s of the die base 105a by the hydraulic pressure drive unit 57 and the electric drive unit 55 is provided, and the technique is enriched. In such an extruder 11, the hydraulic drive unit drives the extrusion plate with respect to the moving die plate, and the electric drive unit drives the extrusion pin with respect to the extrusion plate. Instead of being connected in series to the extrusion pin, the two drive units (51 and 61) are connected in parallel to the extrusion pin. Therefore, for example, by making the two drive units cooperate with each other, a larger drive force can be applied to the extrusion pin 41 as compared with the embodiment in which the two drive units are connected to the extrusion pin in series. Further, in the present embodiment, the extrusion plate 43 is located in the space 105s, and the extrusion pin 41 penetrates only the movable type 105. That is, unlike the embodiment in which the extrusion plate 43 is located behind the moving die plate 17 (see Patent Document 1), the extrusion pin 41 does not have a length that penetrates the moving die plate 17. Therefore, when a large driving force is applied to the extrusion pin 41 as described above, the probability that the extrusion pin 41 is deformed such as buckling is reduced.

Further, since the hydraulic pressure drive unit 57 and the electric drive unit 55 are combined, the load on the hydraulic pressure drive unit 57 can be reduced as compared with the embodiment in which extrusion is performed only by the hydraulic pressure drive unit 57, for example. As a result, for example, the amount of the hydraulic fluid can be reduced and the energy consumption can be reduced. On the other hand, for example, it is easy to obtain a large driving force at low cost by the hydraulic pressure driving unit 57.

The hydraulic pressure drive unit 57 may have a cylinder unit (support member 49) and a piston 61. The cylinder portion may be composed of a first member (support member 49), and the axial direction may be parallel to the mold opening / closing direction. The piston 61 may divide the inside of the support member 49 into a first cylinder chamber (rear side chamber 49e in the present embodiment) and a second cylinder chamber (front side chamber 49d in the present embodiment) in the mold opening / closing direction. At least, the piston 61 may be restricted from moving relative to the second member (driving member 51) from the side of the rear side chamber 49e to the side of the front side chamber 49d. The rear side chamber 49e may be a cylinder chamber to which a hydraulic fluid is supplied when the extrusion pin 41 is driven toward the other mold (fixed mold 103) with respect to one mold (moving mold 105). The front chamber 49d may be open to the atmosphere.

In this case, for example, the effect of reducing the hydraulic fluid of the hydraulic pressure drive unit 57 is improved. That is, since the return of the extrusion pin 41 to the initial position and the movement of the piston 61 to the rear side chamber 49e can be performed by the electric drive unit 55, it is not necessary to fill the front side chamber 49d with the hydraulic fluid. Can be done.

The piston 61 may be allowed to move relative to the second member (drive member 51) in the mold opening / closing direction, and the second cylinder chamber (rear side chamber 49e) to the second cylinder chamber (rear side chamber 49e) to the drive member 51. It may be engageable with the side of the front concubine 49d). The rear side chamber 49e may be a cylinder chamber to which a hydraulic fluid is supplied when the extrusion pin 41 is driven toward the other mold (fixed mold 103) with respect to one mold (moving mold 105).

In this case, the hydraulic fluid is supplied to the rear side chamber 49e to move the piston 61 to the side of the front side chamber 49d, the piston 61 is engaged with the drive member 51, and the drive member 51 is moved to the side of the front side chamber 49d. , The extrusion pin 41 can be moved to the side of the fixed mold 103 with respect to the moving mold 105. That is, the extrusion pin 41 can be driven by the hydraulic pressure drive unit 57 (further, the electric drive unit 55 in this embodiment). After that, when the extrusion pin 41 is moved to the side of the fixed mold 103 with respect to the movable mold 105 by the electric drive unit 55, the drive member 51 is moved to the support member 49 while the piston 61 is stopped with respect to the support member 49. On the other hand, it can be moved to the side of the front chamber 49d.

Therefore, for example, it is compared with an embodiment in which the extrusion pin 41 can be driven by the hydraulic pressure driving unit 57 and the piston 61 and the driving member 51 are fixed (this embodiment is also included in the technique according to the present disclosure). Therefore, the amount of the hydraulic fluid supplied to the rear side chamber 49e can be reduced. When the configuration in which the front chamber 49d is opened to the atmosphere and the configuration in which the drive member 51 is relatively moved with respect to the piston 61 are combined, for example, the effect of dramatically reducing the required amount of the hydraulic fluid in the hydraulic drive unit 57 is dramatically reduced. improves. The configuration in which the drive member 51 is relatively moved with respect to the piston 61 is different from the present embodiment in that the front chamber 49d (or the enlarged diameter portion on which the piston 61 slides) is filled with the hydraulic fluid. May be combined with.

The piston 61 may have a through hole 61h penetrating in the mold opening / closing direction. The second member (driving member 51) may have a rod portion 51c and an engaging portion 51b. The rod portion 51c may have a portion (in this embodiment, a portion on the rear end side of the engaging portion 51b) that is taken in and out of the through hole 61h as it moves relative to the piston 61 in the mold opening / closing direction. The engaging portion 51b is located in the second cylinder chamber (front side chamber 49d), is fixed to the rod portion 51c, and may be able to engage with the piston 61 from the side of the front side chamber 49d to the side of the rear side chamber 49e. ..

In this case, for example, since the portion of the rod portion 51c on the rear end side is housed in the piston 61, the size of the extruder 11 can be easily reduced. Since the drive member 51 and the piston 61 are arranged coaxially or concentrically, the piston 61 and the drive member 51 are arranged in parallel by forming the engaging portion 51b with a flange surrounding the rod portion 51c. (This aspect is also included in the technique according to the present disclosure.) Compared with this, the probability that an unnecessary moment for tilting the axis of the drive member 51 with respect to the axis of the support member 49 is generated is reduced. ..

The electric drive unit 55 may be able to drive the extrusion pin 41 over the entire stroke of the extrusion pin 41. The stroke St0 that can be moved with respect to the cylinder portion (support member 49) of the piston 61 is only a part of the stroke of the extrusion pin 41 on the side (rear) where the extrusion pin 41 is separated from the other mold (fixed mold 103). May correspond to.

In this case, for example, since the movement of the piston 61 is physically restricted so that the stroke of the piston 61 is shorter than the stroke of the extrusion pin 41, the piston 61 is extruded by the electric drive unit 55 while the piston 61 is stopped. The operation of moving the pin 41 is facilitated. As a result, the effect of reducing the hydraulic fluid supplied to the front chamber 49d is improved. Further, of the support member 49, the portion that truly functions as a cylinder portion can be only a part of the support member 49. As a result, for example, the portion of the support member 49 that requires hermeticity or processing accuracy can be reduced, and cost reduction can be achieved.

The piston 61 may have a through hole 61h penetrating in the mold opening / closing direction, and the inside of the cylinder portion (support member 49) has an axial center side portion 49f including the through hole 61h and a second outer peripheral side than the piston 61. It may be divided into one cylinder chamber (rear side chamber 49e). The axial center side portion 49f may be open to the atmosphere. At least a part of the electric drive unit 55 (for example, the screw shaft 60a) may be located in the through hole 61h.

In this case, for example, since at least a part of the electric drive unit 55 is housed in the through hole 61h (axis center side portion 49f), the extrusion device 11 can be downsized. Further, for example, since the axial center side portion 49f is open to the atmosphere, the portion arranged in the through hole 61h of the electric drive unit 55 does not have to be immersed in the hydraulic fluid. As a result, for example, with respect to the arrangement of a part of the electric drive unit 55 in the axial center side portion 49f, it is not necessary to form a closed structure, and the degree of freedom in design is improved. Further, the probability that the fluid resistance of the hydraulic fluid will occur with respect to the driving of the electric driving unit 55 is also reduced.

The extruder 11 may further include a hydraulic pressure source 83 that supplies the hydraulic fluid to the hydraulic pressure drive unit 57. The die plate holding one mold through which the extrusion pin 41 is inserted may be the moving die plate 17 holding the mobile mold 105. The hydraulic pressure source 83 may be supported by the moving die plate 17.

In this case, for example, in the embodiment in which the support member 49 as the cylinder portion is fixed to the moving die plate 17, the support member 49 and the hydraulic pressure source 83 do not move relative to each other. Therefore, for example, the flow path 67b connecting the two can be configured by a member (for example, a pipe and / or a block) that can be regarded as a rigid body. Further, for example, the flow path 67b can be shortened. As a result, the amount of the hydraulic fluid can be reduced, and the influence of compression of the hydraulic fluid in the flow path on the control of the hydraulic pressure drive unit 57 can be reduced.

The electric drive unit 55 may include a rotary electric motor (extruder electric motor 58) and a conversion mechanism 60 that converts the rotation of the extruded electric motor 58 into a linear motion in the mold opening / closing direction. The conversion mechanism 60 may have a screw shaft 60a and a nut 60b. The screw shaft 60a may extend in the mold opening / closing direction, the movement in the axial direction with respect to the first member (support member 49) may be restricted, and rotation around the shaft may be permitted, and the rotation of the extrusion motor 58 is input. It's okay. The nut 60b may be screwed onto the screw shaft 60a, may be allowed to move in the axial direction with respect to the support member 49, and may be restricted from rotating around the shaft, and may be fixed to the second member (drive member 51). good. The drive member 51 may have a hollow shape that accommodates a portion of the screw shaft 60a on the one end side of the nut 60b.

In this case, for example, since the conversion mechanism 60 and the drive member 51 are arranged coaxially or concentrically, the aspect is compared with the embodiment in which both are arranged in parallel (the embodiment is also included in the technique according to the present disclosure). Therefore, the probability that an unnecessary moment will be generated to incline the axis of the drive member 51 with respect to the axis of the support member 49 is reduced. Further, since the conversion mechanism 60 is housed in the drive member 51, the extrusion device 11 can be downsized.

The extrusion device 11 may have a control device 5 that controls a hydraulic drive unit 57 and an electric drive unit 55. When the molded product is in contact with one of the molds (moving mold 105), the control device 5 is extruded by both the hydraulic pressure drive unit 57 and the electric drive unit 55 in a direction in which the molded product is separated from the mobile mold 105. The plate 43 may be configured to move relative to the die plate (moving die plate 17). Further, after the relative movement, the control device 5 further moves the extrusion plate 43 with respect to the moving die plate 17 in the direction of separation by only the electric drive unit 55 among the hydraulic pressure drive unit 57 and the electric drive unit 55. It may be configured to control relative movement.

In this case, for example, as already mentioned, it is easy to obtain a large driving force required for the initial operation of extrusion. On the other hand, in the operation after the initial operation, the load on the hydraulic drive unit 57 can be reduced by the electric drive unit 55. As a result, it is possible to reduce energy consumption and hydraulic fluid.

The molding machine (die casting machine 1) is located between the extrusion device 11 as described above, the hydraulic pressure source 83 that supplies the hydraulic fluid to the hydraulic pressure drive unit 57 of the extrusion device 11, and the fixed mold 103 and the mobile mold 105. It may have a core device 13 for moving the core 109 in and out. The core device 13 includes a hydraulic core cylinder (hydraulic drive unit 75) that generates a driving force transmitted to the core 109, and a core electric motor 76 that generates a driving force transmitted to the core 109. May have. The hydraulic pressure source 83 may supply the hydraulic fluid not only to the hydraulic pressure drive unit 57 but also to the hydraulic pressure drive unit 75.

That is, the hydraulic pressure source 83 that supplies the hydraulic fluid to the hybrid extruder 11 may also be used for the hybrid core apparatus 13. By also using the hydraulic pressure source 83, the hydraulic pressure device 67 can be downsized. Since both the extruder 11 and the core device 13 are hybrid types capable of reducing the hydraulic fluid, the effect of downsizing the hydraulic pressure device 67 is improved.

Further, in the core device 13, the hydraulic core cylinder (hydraulic drive unit 75) that generates the driving force transmitted to the core 109 is directly or indirectly (in the present embodiment, indirectly via the mobile 105). It may be supported by the moving die plate 17. The hydraulic pressure source 83, which is supported by the moving die plate 17 and supplies the hydraulic fluid to the hydraulic pressure drive unit 57 to the extrusion device 11, may also supply the hydraulic fluid to the hydraulic pressure drive unit 75 of the core device 13.

Since the hydraulic pressure drive unit 75 is supported by the moving die plate 17, the hydraulic pressure source 83 is directly supported by the base 14 as in the hydraulic pressure drive unit 57 (this aspect also relates to the present disclosure). The flow path (for example, the flow path 67c) connecting the hydraulic pressure source 83 and the hydraulic pressure drive unit 75 can be shortened as compared with (included in the technique). Further, the flow path can be configured by a member that can be regarded as a rigid body. Therefore, the effect of the above-mentioned effect (for example, reduction of the hydraulic fluid) by providing the hydraulic pressure source 83 on the moving die plate 17 is improved. Further, since the hydraulic pressure source 83 is shared by the hydraulic pressure drive unit 57 and the hydraulic pressure drive unit 75, for example, the hydraulic pressure device 67 can be downsized. Due to the miniaturization, the inertial force when moving the moving die plate 17 is reduced.

In the above embodiment, the die casting machine 1 is an example of a molding machine. The mobile type 105 is an example of one type through which an extrusion pin is inserted. The fixed type 103 is an example of the other type. The moving die plate 17 is an example of a die plate that holds one mold. Further, the moving die plate 17 is an example of one member (a member to which the first member is fixed) of the extrusion plate and the die plate. The extrusion plate 43 is an example of the other member. The support member 49 is an example of the first member. The drive member 51 is an example of the second member. The rear concubine 49e is an example of the first cylinder chamber. The front chamber 49d is an example of a second cylinder chamber. The hydraulic pressure drive unit 75 of the core device 13 is an example of a core cylinder.

The technique according to the present disclosure is not limited to the above embodiments, and may be implemented in various embodiments.

The molding machine is not limited to the die casting machine. For example, the molding machine may be another metal molding machine, an injection molding machine, or a molding machine that molds a material obtained by mixing wood powder with a thermoplastic resin or the like. .. Further, the molding machine is not limited to the horizontal compaction horizontal injection, and may be, for example, vertical compaction vertical injection, vertical compaction horizontal injection, or horizontal compaction vertical injection.

The mold does not have to have a core. In other words, the molding machine does not have to have a core device. In the embodiment in which the molding machine has a core device, the core device may be a hydraulic type or an electric type instead of a hybrid type. The hydraulic core device does not have to share the extruder and the hydraulic device.

The extrusion motor, core motor and / or other motor (eg, mold clamping motor) may be a linear motor instead of a rotary one. In this case, a transmission mechanism for transmitting rotation and a conversion mechanism for converting rotational motion into linear motion are unnecessary. Further, as described in the embodiment, the rotary motor may be connected to the conversion mechanism via the transmission mechanism, or may be connected to the conversion mechanism without the transmission mechanism.

In the extruder, two or more hydraulic drive units may be provided. Similarly, in the extruder, two or more electric drive units may be provided. As mentioned in the description of the embodiment, the hydraulic drive unit and the electric drive unit may be arranged in parallel rather than coaxially or concentrically. In the extruder, the division of roles between the hydraulic drive unit and the electric drive unit may be appropriately set. For example, in the initial stage of extrusion, only one of the hydraulic drive unit and the electric drive unit (for example, the hydraulic drive unit) may be driven.

In the embodiment, the support member 49 is fixed to the moving die plate 17, and the drive member 51 is fixed to the extrusion pin 41. However, as is understood from the known extrusion device (extrusion cylinder), the support member 49 may be fixed to the extrusion pin 41 and the drive member 51 may be fixed to the moving die plate 17 as opposed to the embodiment. .. In this case, for example, a plate-shaped movable member that faces the back of the moving die plate 17 (the side opposite to the moving die 105) and is connected to the extrusion plate 43 via a plurality of extrusion rods may be provided. The support member 49 may be mounted on this movable member. The drive member 51 may be inserted into a movable member and the tip thereof may be fixed to the moving die plate 17. One or more guides may be provided to guide the movable member in the opening / closing direction of the mold and to support the movable member.

In the embodiment, the operation of extending the extrusion device 11 (moving the drive member 51 to the outside of the support member 49) corresponds to the operation of the extrusion pin 41 pushing out the molded product. However, as is understood from the known extrusion device (extrusion cylinder), the operation of contracting the extrusion device 11 (moving the drive member 51 into the support member 49) is the operation of the extrusion pin 41, contrary to the embodiment. It may correspond to the operation of extruding the molded product of. In this case, the extrusion drive unit may be configured such that the drive member can be driven by the hydraulic pressure drive unit when the drive member moves backward from the forward limit, for example, as in the core device 13.

1 ... Die casting machine (molding machine), 5 ... Control device, 7 ... Mold clamping device, 9 ... Injection device, 11 ... Extrusion device, 13 ... Core device, 15 ... Fixed die plate, 17 ... Moving die plate (die plate) , One member), 41 ... Extruded pin, 43 ... Extruded plate (the other member), 49 ... Support member (first member), 51 ... Drive member (second member), 55 ... Electric drive unit, 57 ... Liquid Pressure drive unit, 101 ... mold, 103 ... fixed mold (the other mold), 105 ... mobile mold (one mold), 105a ... die base, 105s ... space, 107 ... cavity, 109 ... core.

Claims (12)

An extruder that drives an extrusion pin that is inserted in one of the fixed and mobile molds in the mold opening / closing direction.
An extrusion plate located in a space formed by the die base of the one mold and fixed to the extrusion pin, and a first member fixed to one of the die plates holding the one mold.
A second member fixed to the other member of the extrusion plate and the die plate, and
A hydraulic drive unit that drives the second member with respect to the first member,
An electric drive unit that drives the second member with respect to the first member,
Has an extruder. The hydraulic drive unit is
A cylinder portion that is composed of the first member and whose axial direction is parallel to the mold opening / closing direction.
It has a piston that divides the inside of the cylinder portion into a first cylinder chamber and a second cylinder chamber in the mold opening / closing direction.
At least the relative movement of the piston from the side of the first cylinder chamber to the side of the second cylinder chamber with respect to the second member is restricted.
The first cylinder chamber is a cylinder chamber to which a hydraulic fluid is supplied when the extrusion pin is driven toward the other mold with respect to the one mold.
The extruder according to claim 1, wherein the second cylinder chamber is open to the atmosphere. The hydraulic drive unit is
A cylinder portion that is composed of the first member and whose axial direction is parallel to the mold opening / closing direction.
It has a piston that divides the inside of the cylinder portion into a first cylinder chamber and a second cylinder chamber in the mold opening / closing direction.
The piston is allowed to move relative to the second member in the mold opening / closing direction, and can be engaged with the second member from the side of the first cylinder chamber to the side of the second cylinder chamber. ,
The extrusion device according to claim 1, wherein the first cylinder chamber is a cylinder chamber to which a hydraulic fluid is supplied when the extrusion pin is driven toward the other mold with respect to the one mold. The piston has a through hole penetrating in the mold opening / closing direction.
The second member is
A rod portion having a portion that is taken in and out of the through hole as the piston moves relative to the mold in the opening / closing direction.
It has an engaging portion that is located in the second cylinder chamber, is fixed to the rod portion, and can engage with the piston from the side of the second cylinder chamber to the side of the first cylinder chamber. The extruder according to claim 3. The electric drive unit can drive the extrusion pin over the entire stroke of the extrusion pin.
The third or fourth aspect of the present invention, wherein the stroke of the piston that can be moved with respect to the cylinder portion corresponds to only a part of the stroke of the extrusion pin on the side where the extrusion pin is separated from the other mold. Extruder. The hydraulic drive unit is
A cylinder portion that is composed of the first member and whose axial direction is parallel to the mold opening / closing direction.
It has a piston that divides the inside of the cylinder portion into a first cylinder chamber and a second cylinder chamber in the mold opening / closing direction.
At least the relative movement of the piston from the side of the first cylinder chamber to the side of the second cylinder chamber with respect to the second member is restricted.
The first cylinder chamber is a cylinder chamber to which a hydraulic fluid is supplied when the extrusion pin is driven toward the other mold with respect to the one mold.
The piston
It has a through hole that penetrates in the opening and closing direction of the mold.
The inside of the cylinder portion is divided into an axial center side portion including the through hole and the first cylinder chamber on the outer peripheral side of the piston.
The axial portion is open to the atmosphere and is open to the atmosphere.
The extruder according to claim 1, wherein at least a part of the electric drive unit is located in the through hole. It further has a hydraulic pressure source that supplies the hydraulic fluid to the hydraulic pressure drive unit.
The die plate is a moving die plate that holds the moving mold as one of the molds.
The extruder according to any one of claims 1 to 6, wherein the hydraulic pressure source is supported by the moving die plate. The electric drive unit is
With a rotary motor,
It has a conversion mechanism that converts the rotation of the motor into a linear motion in the opening and closing direction of the mold.
The conversion mechanism is
A screw shaft that extends in the mold opening / closing direction, is restricted from moving in the axial direction with respect to the first member, is allowed to rotate around the shaft, and is input with the rotation of the motor.
A nut, which is screwed to the screw shaft, is allowed to move in the axial direction with respect to the first member, is restricted from rotating around the shaft, and is fixed to the second member. Have and
The extruder according to any one of claims 1 to 7, wherein the second member is a hollow shape accommodating a portion of the screw shaft on one end side of the nut. It has a control device that controls the hydraulic drive unit and the electric drive unit.
In the control device, when the molded product is in contact with the one mold, both the hydraulic drive unit and the electric drive unit move the molded product away from the one mold. Is moved relative to the die plate, and then the extrusion plate is further moved relative to the die plate in the direction of separation by only the electric drive unit of the hydraulic drive unit and the electric drive unit. The extruder according to any one of claims 1 to 8, which is configured to control the extrusion. The extruder according to any one of claims 1 to 9, and the extruder.
A fixed die plate that holds the fixed mold, and a mold clamping device that has a moving die plate that holds the mobile mold.
An injection device that injects molding material into a cavity composed of the mobile mold and the fixed mold, and
Has a molding machine. The extruder according to any one of claims 1 to 6, and the extruder.
A hydraulic pressure source that supplies the hydraulic fluid to the hydraulic pressure drive unit,
A core device that inserts and removes a core between the fixed type and the mobile type, and
Have and
The core device is
A hydraulic core cylinder that produces a driving force transmitted to the core, and
It has a core motor that produces a driving force transmitted to the core, and has.
The hydraulic pressure source is a molding machine that also supplies a hydraulic fluid to the core cylinder. The extruder according to claim 7 and
A core device that is supported by the moving die plate and that inserts and removes the core between the fixed mold and the mobile mold.
Have and
The core device has a hydraulic core cylinder that generates a driving force transmitted to the core.
The hydraulic pressure source is a molding machine that also supplies a hydraulic fluid to the core cylinder.

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