JP2003145614A - Molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a molding without a flaw in appearance by decreasing the variation of deceleration of a mold in transfer from high-speed movement to low-speed movement when a pair of molds is closed. SOLUTION: A blow molding machine 1 has a first fitting plate 9 which fits and holds a first mold 51 and a second fitting plate 13 which is arranged to face the first mold 51 and fits/holds a second mold 53. One end of each of tie-bars 7 is connected to the first fitting plate 9, a third fitting plate 11 is connected to the other end of each of the tie-bars 7, and the second fitting plate 13 is inserted movably into the tie-bar 7 between the first fitting plate 9 and the third fitting plate 11. The tie-bars 7 are held by a fixed plate. A movement apparatus 20 having a servo-motor 30 used when a pair of molds 50 comprising the first mold 51 and the second mold 53 is moved at a high speed to approach each other and a hydraulic cylinder 40 for holding a pair of the molds 50 being clamped by pressure is installed between the third fitting plate 11 and the second fitting plate 13.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a molding apparatus,
More specifically, the present invention relates to a molding device configured such that a pair of molds including a first mold and a second mold are arranged so as to face each other, and the molds are movable in a direction of approaching and separating from each other.

[0002]

2. Description of the Related Art A blow molding method is known as a method for molding a thermoplastic resin such as vinyl chloride or polyethylene into a hollow molded article such as a bottle or a container. There is a blow molding device as a molding device using this blow molding method. This blow molding apparatus includes, for example, a first mounting plate for mounting and holding a first mold of a pair of molds including a first mold and a second mold, and a second mold for the first mold. A second mounting plate which is disposed so as to face the mold and mounts and holds the second mold; a first mounting plate and a second mounting plate
A moving mechanism configured to be movable in a direction to move the mounting plates toward and away from each other, and one end pivotally connected to the first mounting plate or the second mounting plate and the other end pivotally connected to the main body of the apparatus to receive hydraulic pressure. And a hydraulic cylinder that moves the first mounting plate and the second mounting plate to move them toward and away from each other.

In order to mold a hollow molded article by the blow molding apparatus having the above-mentioned structure, first, the thermoplastic resin that has been heated and melted is extruded downward from above between a pair of molds in the mold open state to form a tubular shape. Discharge the parison. Then, after the lower end of the extruded parison is pinched and the lower end is closed, a small amount of air is injected into the parison to prevent the inner walls of the parison from adhering to each other. Then, when the extruded length of the extruded parison reaches a predetermined size corresponding to the hollow molded product, a pair of molds are moved in a direction in which they approach each other via a moving mechanism by a hydraulic cylinder (hereinafter, this movement will be referred to as " The mold is closed ".).
Then, in the final stage of mold closing, after decelerating the moving speed of the mold closing, a high pressure hydraulic pressure is applied to the hydraulic cylinder to clamp the pair of molds into a close contact state. At the same time as mold clamping, pressurized air is blown into the parison to expand the parison, and the parison is brought into close contact with the inside of the mold and then cooled and solidified to correspond to the shape of the mold internal space (molding space). Hollow molded articles such as bottles and containers are molded. The timing of blowing the pressurized air into the parison varies depending on the shape of the pair of molds and the like, and may be when the pair of molds is closed.

[0004]

When a tubular parison is extruded between a pair of molds that have been opened, the parison extends downward due to its own weight and the film thickness gradually decreases. It causes a drooping phenomenon. For this reason,
In order to make the film thickness of the molded product a predetermined thickness, for example, when the extrusion length of the parison reaches a predetermined dimension, it is necessary to close the pair of molds at high speed. Also, when clamping a pair of molds, if the clamping speed of the pair of molds is kept high, the parison may be cut or the mold may be damaged. The mold clamping speed must be low.

However, the hydraulic cylinder for moving the die is affected by expansion / contraction of a hose or the like through which oil flows and a change in oil viscosity when the environmental temperature changes, and it is difficult to perform precise speed control. May become. as a result,
When the rate of deceleration of the moving speed that shifts the moving speed of the mold from high speed to low speed fluctuates every time a molded product is manufactured, if the parison is inflated by the initially injected air, the mold There arises a problem that the tip end contacts the parison surface in a rubbing state and damages the parison surface, and as a result, the appearance of the molded product may be deteriorated and the commercial value may be reduced.

The present invention has been made in view of such a problem, and when closing a pair of molds, the rate of deceleration of the mold transfer speed at the time of shifting from high speed movement to low speed movement is molded. It is an object of the present invention to provide a molding apparatus capable of manufacturing a molded product which does not change every time the product is manufactured and has no appearance damage.

[0007]

In order to solve the above-mentioned problems, the molding apparatus of the present invention is a molding material in a molding space formed by combining a pair of molds including a first mold and a second mold. A molded product (for example, the hollow container 7 in the embodiment).
0) in a molding apparatus (for example, the blow molding apparatus 1 in the embodiment), a first attachment holding unit (for example, the first attachment plate 9 in the embodiment) that attaches and holds the first die, and a first metal. The second attachment holding means (for example, the second attachment plate 13 in the embodiment) that is arranged to face the die and attaches and holds the second die, and the first attachment holding means and the second attachment holding means are moved toward and away from each other. The supporting means (for example, the fixing plate 5, the tie bar 7, and the third mounting plate 11 in the embodiment) movably supported in the direction, and the first mounting holding means and the second mounting holding means are relatively moved via the supporting means. And a moving device (for example, the moving device 20 in the embodiment) that moves the two closer to and away from each other, the moving device including an electric motor and an electric motor connected to the electric motor. A motion conversion means (for example, the ball screw 28 in the embodiment) that converts the rotational motion of the motor into a linear motion, and a linear motion member that is driven by the driving force of the electric motor via the motion conversion means to perform a linear motion. The linear movement member is mounted between the linear movement member and at least one of the first attachment holding means and the second attachment holding means, moves linearly with the linear movement member, and expands and contracts in the same direction as the movement direction of the linear movement member. And a hydraulic cylinder configured to press or move the first attachment holding means or the second attachment holding means.

According to the molding apparatus having the above structure, the moving means has the electric motor and the hydraulic cylinder, and the hydraulic cylinder is linearly moved together with the linear motion member by the operation of the electric motor. Since it expands and contracts in the same direction as the movement direction, the pair of dies attached to the first attachment holding means and the second attachment holding means can be moved closer to each other by highly accurate speed control by the electric motor, and by the hydraulic cylinder. The pair of molds can be fixed and held in a state of being clamped by pressure.

Further, in the molding apparatus having the above construction, the linear motion member is linearly moved by the electric motor through the motion converting means to move the first mold and the second mold at a high speed to a first proximity position (for example, to carry out). The first mold and the second mold move to the second proximity position after being moved closer to the first proximity X1) in the embodiment and then decelerated to the second proximity position (for example, the second proximity distance X2 in the embodiment). Then, the hydraulic cylinder is actuated to close the pair of molds, and the first mold and the second mold are clamped and held by the pressure of the hydraulic cylinder with the pair of molds closed. Movement control means (for example,
The controller 60) in the embodiment and the movement restricting means (for example, the electromagnetic brake 33 in the embodiment) configured to fixedly hold the linear movement of the linear movement member with respect to the movement converting means when the hydraulic cylinder is operated.
And may have.

According to the molding apparatus having the above structure, the movement of the pair of molds from the first proximity position to the second proximity position is controlled by the operation of the electric motor. You can slow down with. For this reason,
The contact state between the mold and the surface of the parison does not change for each production of the molded product and is made constant, and as a result, a molded product having no damage on the surface of the parison and no appearance damage can be manufactured.

Further, in the molding apparatus having the above-mentioned structure, there are provided a plurality of moving mechanism portions including the motion converting means, the linear moving member and the hydraulic cylinder, and each hydraulic cylinder of the plurality of moving mechanism portions is the first attachment holding means or the first mounting holding means. It may be configured to be connected to the two attachment holding means and linearly move the linear motion member via the motion conversion means of the plurality of movement mechanism parts by a single electric motor.

According to the molding apparatus having the above structure, since the plurality of moving mechanism parts are connected to the first attachment holding means or the second attachment holding means, the first attachment holding means or the second attachment holding means are pressed uniformly. can do. Therefore, even when the size of the first attachment holding means or the second attachment holding means is large, the first attachment holding means and the second attachment holding means are pressed evenly and the first attachment holding means and the second attachment holding means are pressed.
The movement of the attachment holding means can be made smoother, and the force acting between the pair of molds attached to these holding means can be made to act evenly.

In the molding apparatus having the above-mentioned structure, a plurality of moving means are provided, and one of the plurality of moving means is connected between the supporting means and the first attachment holding means, The other moving means may be connected between the supporting means and the second attachment holding means.

According to the molding apparatus having the above structure, since the first attachment holding means and the second attachment holding means are directly moved by the respective moving means, the first attachment holding means and the second attachment holding means.
The movement accuracy of the attachment holding means can be further improved, and the pair of molds can be clamped with a larger pressure.

In the molding apparatus having the above structure, the electric motor is a servomotor with a braking function, and the movement restricting means actuates the braking function of the servomotor while operating the hydraulic cylinder to linearly move the motion converting means. It may be configured to hold the linear movement of the member fixed.

According to the molding apparatus having the above structure, the brake function of the electric motor is operating when the hydraulic cylinder is operating, so that the hydraulic cylinder presses the first mounting holding means or the second mounting holding means. It is possible to prevent the linear motion member from linearly moving due to the reaction force at this time, and to maintain the state of the pair of molds in the mold clamping state.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to FIGS. The present embodiment shows a mode of a blow molding device using a blow molding method used for molding a hollow molded product having a complicated shape in addition to a bottle and a container.

As shown in FIG. 1, the blow molding apparatus is installed on two bases 3 and 4 installed with a predetermined gap in the left-right direction (up-down direction in FIG. 1). The base 3 on the right side of the bases 3 and 4 is fixedly supported, and the left side base 3 supports the left end of the blow molding apparatus 1 so as to be movable in the left-right direction. The blow molding device 1 includes a fixed plate 5 mounted on the right base 4 in a state of protruding upward, and four tie bars 7 slidably inserted in the left and right directions at four corners of the fixed plate 5. The first tie bar 9 and the third tie bar 11 attached to the left and right ends of these tie bars 7 and the four tie bars 7 extending between the fixed plate 5 and the first tie bar 9 are slidable in the left and right direction. In a direction in which the second mounting plate 13 mounted in a state of being inserted into the first mounting plate 9 and the second mounting plate 13 mounted between the third mounting plate 11 and the second mounting plate 13 are moved toward and away from each other. And a moving device 20 for moving.

FIG. 2 shows a plan view of the blow molding apparatus 1,
As shown in the figure, a first rack member 15 protruding toward the second mounting plate 13 side and having a rack 15 a threaded at the tip is attached to a side portion of the third mounting plate 11, and the second mounting plate 13 is attached. A rack 16 that protrudes toward the third mounting plate 11 on the side of the rack 16 and is arranged at the tip end of the rack 16 so as to face the rack 15a of the first rack member 15.
The second rack member 16 in which a is threaded is attached. The racks 15a of the first rack member 15 and the racks 16a of the second rack member 16 are engaged with pinion 17 rotatably held by a holding plate (not shown) fixedly held by the fixing plate 5 shown in FIG. There is. Therefore, the first mounting plate 9 and the third mounting plate 11 are movable in the left-right direction interlockingly with the fixed plate 5 via the four tie bars 7.
The mounting plate 13 is movable in the left-right direction between the first mounting plate 9 and the fixed plate 5 via the four tie bars 7, and when the second mounting plate 13 is further moved in the left-right direction, the mounting plate 13 is interlocked with the first mounting plate 9 1
The mounting plate 9 moves to the second speed at the same speed as the moving speed of the second mounting plate 13.
It is configured to move in a direction toward or away from the mounting plate 13.

The moving device 20 disposed between the second mounting plate 13 and the third mounting plate 11 has a linear motion member extending in the left-right direction through a through hole 11a penetrating the central portion of the third mounting plate 11. 21 and the right side of the linear motion member 21 (upper side in FIG. 2)
Motion conversion gear 2 screwed onto the male screw portion 21a formed on the
5, a servomotor 30 for transmitting rotational motion to the motion conversion gear 25, and a hydraulic cylinder 40 mounted between the linear motion member 21 and the second mounting plate 13. The motion conversion gear 25 has a female screw portion 25a threaded at a position along the central axis of rotation in a penetrating state.
A gear portion 25b protruding in the width direction (left and right direction in FIG. 2) is formed at the left end portion of the, and the right end portion of the motion conversion gear 25 is rotatably fitted in the through hole 11a of the third mounting plate 11. The motion conversion gear 25 is rotatably held by the mounting member 47 mounted on the third mounting plate 11.

The servomotor 30 is attached to the third attachment plate 11 via a holding member (not shown), and the servomotor 3
A drive gear 31 is attached to the tip of the drive shaft 30 a of 0, and the drive gear 31 is the gear portion 2 of the motion conversion gear 25.
It meshes with 5b. The servomotor 30 has a drive shaft 30.
An electromagnetic brake 33 for preventing reverse rotation of a is mounted. The male screw portion 21a of the linear motion member 21 that is screwed into the female screw portion 25a of the motion conversion gear 25 is threaded into a shape that moves the linear motion member 21 in the axial direction when the motion conversion gear 25 rotates. A steel ball (not shown) is inserted in the ball screw 28, and a ball screw 28 is constituted by the motion converting gear 25 and the shaft portion 21b having the male screw portion 21a of the linear motion member 21. The linear motion member 21 extends toward the second mounting plate 13 side, and the tip end portion thereof has a piston 41 of the hydraulic cylinder 40.
And the cylinder rod 43 are also used. The cylinder tube 44 of the hydraulic cylinder 40 is attached to a substantially central portion of the right side wall surface of the second mounting plate 13, and the piston 41 formed at the tip of the linear motion member 21 is fitted in the cylinder tube 44 so as to be movable in the left and right directions. Cylinder tube 44
The inside is divided into a bottom chamber 44a and a rod chamber 44b.

Inside each of the first mounting plate 9 and the second mounting plate 13, there are a pair of molds 5 consisting of a first mold 51 and a second mold 53.
0 is mounted in a state of being opposed to each other, and the first mold 51
The second mold 53 is moved by the first mounting plate 9 and the second mounting plate 13 in the directions toward and away from each other with the center line S shown in FIG. 2 as the center. First mold 51 and second mold 53
Molding spaces 55 that form the outer shape of the hollow container 70 shown in FIG. 4 are formed in a state where the first mold 51 and the second mold 53 shown in FIGS. 3 and 4 are closed.

The controller 60 controls the operations of the servomotor 30 and the hydraulic cylinder 40 that move the pair of molds 50 shown in FIG. The controller 60 controls the operation of the operation control valve V connected to the hydraulic cylinder 40 via the hose H to control the oil supply / discharge control to / from the hydraulic cylinder 40, while moving the moving distance between the pair of molds 50. The rotational speed of the servomotor 30 is controlled by feedback-controlling the moving speed of the pair of molds 50 based on a position signal from a pulse encoder (not shown) that measures Specifically, the controller 60 will be further described with reference to FIG. 5. When the distance X between the pair of molds is X3, the controller 60 closes the pair of molds 50 (hereinafter, referred to as “mold closing”). ) To start. The mold closing control by the controller 60 is configured to operate by operating an operation start switch (not shown) or the like. Mold closing control, first the servo motor 30 is rotated, the die distance X is to close the mold a pair of molds 50 at a high speed V _h until first proximity distance X1. Then, the moving speed of the pair of molds 50 is reduced until the inter-die distance X reaches the second proximity distance X2. At this time, the rate of deceleration is substantially constant, and when the inter-die distance X reaches the second proximity distance X2, the moving speed of the pair of dies 50 is controlled to be the low speed V _L. When the distance X between the pair of molds becomes the second proximity distance X2,
The controller 60 gradually decreases the rotation speed of the servo motor 30 and controls the operation of the operation control valve V shown in FIG. 2 to extend the hydraulic cylinder 40. That is,
The operation of the operation control valve V is controlled so that the oil is supplied to the bottom chamber 44a and the oil is discharged from the rod chamber 44b.

The extension speed of the hydraulic cylinder 40 is controlled in consideration of the deceleration of the servo motor 30 so that the moving speed of the pair of molds 50 is maintained at V _L. Then, the controller 60 stops the rotation of the servo motor 30 when the die-to-die distance X reaches X4, sets the extension speed of the hydraulic cylinder 40 to V _L , and until the die-to-die distance X becomes zero. The low extension speed of the hydraulic cylinder 40 is maintained at V _L. When the die-to-die distance X becomes X4, the controller 60 sets the electromagnetic brake 33 of the servomotor 30 in the excited state to regulate the reverse rotation of the drive shaft 30a shown in FIG.

In order to mold a molded product of a hollow container by the blow molding device 1 thus constructed, as shown in FIG. 3, first, a pair of metal molds is held in a state where the distance X between the pair of molds is X3. From above the space between the molds 50, for example, a heat-melted thermoplastic resin is extruded downward to eject the tubular parison P. Then, after the lower end of the extruded parison P is pinched to close the lower end, the parison P
A small amount of air is injected into the inside of the parison P to prevent the inner walls of the parison P from adhering to each other. Then, when the extruded length of the extruded parison P reaches a predetermined dimension corresponding to the molded product, further explanation will be given by further adding FIG. 2, and the controller 60 shown in FIG. 2 rotationally drives the servo motor 30 to make a pair of molds. Figure 50
After moving the mold distance X3 from X3 to X1 at high speed,
The moving speed of the pair of molds 50 is set to the low speed V _L by decelerating to the mold distance X2.

[0026] Incidentally, until the moving speed shown in FIG slows V _L, the parison P extruded between a pair of molds 50 shown in FIG. 3 is extended downward by its own weight, and the molded product shown in Fig 4 In order to make the film thickness of the hollow container 70 to be a desired thickness,
Before reaching the permissible elongation amount of the parison P, the parison P is clamped at its upper and lower ends by a pair of molds 50 as shown in FIG. Therefore, the thickness of the manufactured hollow container 70 can be set to a desired thickness.

Here, as shown in FIG. 3, when the extruded parison P is slightly expanded by the injected air as shown by the chain double-dashed line, from the die distance X1 shown in FIG. Consider a situation in which the rate of deceleration of the moving speed when the pair of molds 50 moves inward greatly varies for each molded product to be manufactured. In this case, it is considered that the contact state between the pair of molds 50 and the parison surface changes when the deceleration rate of the moving speed changes, and as a result, the parison surface may be scratched.

However, in the blow molding apparatus 1 according to the present invention, since the moving speed of the pair of molds 50 immediately before the parison P is clamped is reduced at a constant rate (see FIG. 5), a molded product is manufactured. The moving conditions of the pair of molds 50 can be made constant. For this reason, even if the extruded parison P is slightly expanded as shown by the chain double-dashed line, the contact state between the pair of molds 50 and the parison surface must be changed for each production of the molded product. Conceivable. As a result, the parison P can be sandwiched between the pair of molds 50 as shown in FIG. 4 without damaging the surface of the parison, and the hollow container 70 having no external appearance can be manufactured.

As shown in FIG. 5, when the die-to-die distance X becomes X2, the hydraulic cylinder 40 shown in FIG. 2 expands to move the pair of dies 50 further closer to each other to move the die-to-die distance X. Is set to zero and the mold is closed, and the hydraulic cylinder 40
The pair of molds 50 are clamped by the pressing force of. Here, when the die-to-die distance X becomes X4, the electromagnetic brake 33 of the servomotor 30 shown in FIG. 2 is brought into an excited state to regulate the reverse rotation of the drive shaft 30a. Therefore, as shown in FIG. 2, the hydraulic pressure in the hydraulic cylinder 40 (in the bottom chamber 44a) becomes high in a state where the pair of molds 50 are clamped, and a pressure acts between the pair of molds 50. The reaction force is the linear motion member 2
Even when acting on 1, the drive shaft 30a of the servo motor 30 is in a fixed state, so that the linear motion member 21 does not move to the third mounting plate 11 side. Therefore, the state of the pair of molds 50 clamped by the pressure can be maintained. Then, as shown in FIG. 4, pressurized air is blown into the parison P at the same time as the mold clamping to expand the parison P,
Then, after the parison P is brought into close contact with the inside of the pair of molds 50, the parison P is cooled and solidified to mold the hollow container 70.

In the above-described embodiment, as shown in FIG. 2, one moving device 20 moves the first mold 51 and the second mold 53 toward and away from each other. As shown in FIG. 6A, the two moving devices 20 may move the first mold 51 and the second mold 53, respectively. In this case, a pair of third mounting plates 11 are attached to both ends of the plurality of tie bars 7,
The supporting device including the pair of third mounting plates 11 and the plurality of tie bars 7 is configured to be fixed to the fixing plate 5 shown in FIG. Then, the first mounting plate 9 and the second mounting plate 13 are movably inserted through the plurality of tie bars 7 between the pair of third mounting plates 11 in the left-right direction (left-right direction in FIG. 6). One moving device 20 is connected between the left third mounting plate 11 and the first mounting plate 9, and another moving device 20 is connected between the right third mounting plate 11 and the second mounting plate 13. With this configuration, the servo motor 30, the pair of third mounting plates 11 and the like do not move even when the servo motor 30 is driven, and the first mounting plate 9, the second mounting plate 11 and these are mounted. Only the pair of molds 50 moves. Therefore, the drive torque is reduced to reduce the servo motor 3
The blow molding device 1 can be improved in stability. Also, the first mounting plate 9
Since the moving device 20 is attached to each of the first mounting plate 9 and the second mounting plate 13, the moving accuracy of the first mounting plate 9 and the second mounting plate 13 can be further improved, and the pair of molds 50 can be made larger. It can be clamped by pressure.

Further, in the above-described embodiment, an example having one movement mechanism portion 73 composed of the movement conversion gear 25, the linear movement member 21 and the hydraulic cylinder 40 shown in FIG. 2 is shown, but it is a plan view. As shown in FIG. 6B, two moving mechanism portions 73 are arranged side by side in the width direction (vertical direction in FIG. 6), and the hydraulic cylinders 40 of each moving mechanism portion 73 are arranged in the second direction.
It may be connected to the mounting plate 13. In this case, the drive gear 31 connected to the drive shaft 30a of the servo motor 30 is meshed with the gear portion 25b of the motion converting gear 25 of each moving mechanism portion 73. When the servo motor 30 is driven to rotate,
Since the one motion conversion gear 25 and the other motion conversion gear 25 rotate in opposite directions, the ball screw 28 of the one moving mechanism portion 73 is adjusted so that the moving directions of the linear motion members 73 are the same.
Change the direction of the screw part of. With this configuration, when clamping the pair of molds 50, the pair of molds 50
The force acting between can be made to act uniformly.

[0032]

As described above, according to the molding apparatus of the present invention, the moving means includes the electric motor and the hydraulic cylinder, and the hydraulic cylinder is linearly moved together with the linear motion member by the operation of the electric motor. , The hydraulic cylinder is configured to expand and contract in the same direction as the movement direction of the linear motion member, so that the pair of molds attached to the first attachment holding means and the second attachment holding means can be moved at high speed with an electric motor. It is possible to move closer by control, and the pair of molds can be fixedly held in a state of being clamped by pressure by a hydraulic cylinder.

When the deceleration movement of the pair of molds between the first proximity position and the second proximity position is controlled by the operation of the electric motor, the movement speed can be decelerated with high accuracy and at a constant rate. . Therefore, the contact state between the mold and the parison surface does not change for each production of the molded product and is constant,
As a result, it is possible to manufacture a molded product having no scratch on the surface of the parison and no damage on the appearance.

[Brief description of drawings]

FIG. 1 shows a front view of a blow molding apparatus according to an embodiment of the present invention.

FIG. 2 shows a plan view of a blow molding device according to an embodiment of the present invention.

FIG. 3 is a sectional view of a mold for explaining the operation of the blow molding apparatus according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a mold for explaining the operation of the blow molding device according to the embodiment of the present invention.

FIG. 5 is a diagram for explaining die closing of a die according to an embodiment of the present invention.

FIG. 6 shows a plan view of a blow molding device according to an embodiment of the present invention.

[Explanation of symbols]

1 Blow molding equipment 5 Fixed plate (supporting means) 7 Tie bar (supporting means) 9 First mounting plate (first mounting holding means) 11 Third mounting plate (supporting means) 13 Second mounting plate (second mounting and holding means) 20 Moving device (moving means) 21 Linear motion member 28 Ball screw (motion conversion means) 30 Servo motor 33 Electromagnetic clutch (movement restriction means) 40 hydraulic cylinder 50 pair of mold 51 First mold 53 Second mold 55 Molding space 60 controller (movement control means) 70 Hollow container (molded product) 73 Moving mechanism X1 First proximity distance (first proximity position) X2 Second proximity distance (second proximity position)

Claims (5)

[Claims] 1. A molding apparatus for molding a molded product by placing a molding material in a molding space formed by combining a pair of molds including a first mold and a second mold, wherein the first mold is First attachment holding means for attaching and holding;
Second mounting holding means for mounting and holding the second mold by being arranged opposite to the first mold, and movable in a direction in which the first mounting holding means and the second mounting holding means move toward and away from each other. A molding apparatus comprising: a supporting unit that supports the moving unit; and a moving unit that relatively moves the first mounting holding unit and the second mounting holding unit via the supporting unit to move the first mounting holding unit and the second mounting holding unit toward and away from each other. The moving means is driven by the driving force of the electric motor via the electric motor, the movement converting means connected to the electric motor to convert the rotational movement of the electric motor into the linear movement, and the driving force of the electric motor via the movement converting means. A linear motion member that performs linear motion by means of a linear motion member, and is mounted between the linear motion member and at least one of the first attachment holding means and the second attachment holding means,
Linearly moving with the linear motion member, and expanding and contracting in the same direction as the motion direction of the linear motion member to press or move the first attachment holding means or the second attachment holding means with respect to the linear movement member. And a hydraulic cylinder configured as described above. 2. After the linear motion member is linearly moved by the electric motor via the motion conversion means, the first mold and the second mold are moved close to the first proximity position at high speed. When the first mold and the second mold are decelerated to the second proximity position and the first mold and the second mold move to the second proximity position, the hydraulic cylinder is operated to close the pair of molds, and the pair of molds. In a mold closed state, the first mold and the second mold are clamped and held by the pressure of the hydraulic cylinder to hold the movement control means, and the hydraulic cylinder is operated when the hydraulic cylinder is operated. 2. The molding apparatus according to claim 1, further comprising a movement restricting unit configured to fix and hold the movement of the linear movement member with respect to the movement conversion unit. 3. A plurality of moving mechanism parts each comprising the motion converting means, the linear motion member and the hydraulic cylinder, each hydraulic cylinder of the plurality of moving mechanism parts being the first attachment holding means or the second It is connected to an attachment holding means, and is configured to linearly move the linear motion member via each motion conversion means of the plurality of movement mechanism parts by the single electric motor. The molding apparatus described in 2. 4. A plurality of the moving means, wherein a plurality of the moving means, one of the plurality of moving means is connected between the supporting means and the first attachment holding means, 3. The molding apparatus according to claim 1, wherein the other moving means is connected between the supporting means and the second attachment holding means. 5. The electric motor is a servomotor with a braking function, and the movement restricting means actuates the braking function of the servomotor while operating the hydraulic cylinder to cause the straight line to move to the motion converting means. The molding device according to claim 2, wherein the molding device is configured to hold a linear movement of the moving member in a fixed manner.