JPH05301260A - Low-pressure injection molding method and low-pressure injection molder - Google Patents

Abstract

PURPOSE:To mold a molded article by casting molten resin, which is fed from an injection unit through a flow path connecting device to a molding equipment, onto the molding surface of a lower mold by low pressure injection instead of high pressure parting injection and, at the same time, make the movement of the lower mold possible in order to unload a molded product. CONSTITUTION:During the lowering course of the upper mold 51 of a molding equipment B toward its lower mold 55, the molding material feeding section 42 of an injection unit A is moved forward to molding equipment B side. After that, the internal flow path 5 of a first joint nozzle 1 fitted to the molding material feeding section 42 and the internal flow path of a second joint nozzle 2 fitted to the lower mold 55 are connected in series with each other. By feeding molten resin from the delivery flow path of the molding material feeding section 42 through both the internal flow paths into the pouting flow path of the lower mold 55, the molten resin is injected on the molding surface 55a of the lower mold 55. A molded article is molded between the upper mold 51 and the lower mold 55 by lowering the upper mold 51 to the lowering end. Then, by moving the lower mold 55 together with the molded article, the article is released from below the upper mold 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low pressure injection molding method and a low pressure injection molding machine for injecting a molten synthetic resin molding material at a low pressure to mold various molded products.

[0002]

2. Description of the Related Art In a conventional injection molding machine, for example, as shown in FIG. 8, a movable plate a to which an upper mold b is attached is lowered and a parting surface b1 of the upper mold b is attached to a fixed plate c. An injection port in which the molding material supply section e is moved forward so that the tip of the injection section e1 is located at the position of both parting surfaces b1 and d1 of the upper and lower molds b and d while being in close contact with the parting surface d1 of the mold d. State in which the molten molding material is injected from the injection portion e1 at a high pressure between the molding surfaces of the upper and lower molds b and d, and the molding material supply portion e is retracted after the molding and the movable plate a is raised. Then, the molded product on the lower mold d was taken out.

[0003]

In the conventional injection molding machine described above, it is necessary to take out the molded product from the gap between the upper mold b and the lower mold d, which hinders the safety of the taking-out work. In addition, the problem is that the take-out device becomes complicated and large when automating the take-out operation of the molded product, and when taking out the skin-integrated laminating molding and insert molding, the take-out arm is moved between the upper and lower molds b and d and After grasping the molded product, retract the take-out arm, then set the skin and insert parts in the lower mold d and again move the take-out arm between the upper and lower molds b and d, and then retract the take-out arm. Therefore, there is a problem that the number of times of handling increases and the molding cycle time for one time becomes long, which lowers productivity. According to the present invention, the molten resin fed from the injection device to the molding device through the flow path connecting device is poured onto the molding surface of the lower mold by low pressure injection without performing parting injection at high pressure to form a molded product. An object of the present invention is to make it possible to move a mold to simplify and streamline a work for taking out a molded product.

[0004]

According to the present invention, an internal flow path of a first joint nozzle attached to the molding material supply section by advancing the molding material supply section of a lateral supply type injection apparatus to the molding apparatus side. And the internal flow path of the second joint nozzle attached to the lower mold in series, and before the upper mold descends to the descending end, the molten resin is discharged from the discharge flow path of the molding material supply unit. Feeding to the injection channel of the lower mold via both internal flow channels to start injection of the molten resin onto the molding surface of the lower mold, while injecting the molten resin or completion of injection of the molten resin After that, the upper die is lowered to the lower end to form a molded article between the upper die and the lower die, and then the lower die is moved together with the molded article so as to escape from immediately below the upper die. Controlled low-pressure injection molding method and lateral pressing of molten resin The other party of the injection device for the lower mold having a molding surface which is molten resin injected at a low pressure is poured,
An upper mold for molding a molded product between the lower mold when descending, and a lower mold moving mechanism for escaping the lower mold from directly below the upper mold together with the molded product are installed,
Between the injection device and the molding device, a first joint nozzle attached to a molding material supply part of the injection device and a second joint nozzle attached to the lower mold can be separated in a butt shape. The gist of the invention is a low-pressure injection molding machine provided with a connected flow path connecting device.

[0005]

A first joint nozzle having an internal flow path connected to the discharge flow path of the molding material supply section of the injection device, and a second joint flow path having an internal flow path connected to the injection flow path of the lower die of the molding device.
On the molding surface of the lower mold, a joint nozzle is combined to connect the discharge flow path of the injection device and the injection flow path of the lower mold in series through the both internal flow paths and are fed to the injection flow path. The molded resin is molded by pinching the molten resin injected into the mold between the upper and lower molds, and after molding the molded product, it is easy to take out the molded product by ejecting the lower mold together with the molded product from below the upper mold. Transfer to the position.

[0006]

According to the present invention, after the completion of each molding, the lower mold together with the molded product escapes from the position directly below the upper mold to the take-out station in which the upper and both sides are opened and moves to the position where the molded product can be easily taken out. Since the space for the take-out device can be secured, the take-out device can be simplified by simplifying the take-out operation of the molded product by the take-out device and the passing operation to the automatic transfer device, and the automation of the molding line is fully automated. Moreover, since the take-out device can be attached to the molding device, the installation space of the take-out device can be reduced. In addition, the number of times of handling required for taking out molded products can be reduced and the take-out and delivery operations of molded products can be speeded up, so that the taking-out work of molded products and the delivery work to the automatic transfer device are streamlined. The cycle time can be shortened. Further, since the lower mold can be escaped from the lower part of the upper mold, the lower mold replacement work can be simplified and streamlined.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. First, the low-pressure injection molding machine will be described. The low-pressure injection molding machine is a horizontal-feed type injection device A for laterally pressure-sending a molten resin obtained by melting a synthetic resin molding material.
And a molding device B of a vertical mold clamping system, which is provided next to the injection device A and press-molds a molded product, and an injection device A.
And a flow channel connecting device C that separably connects the discharge flow channel and the injection flow channel of the molding apparatus B.

In the injection device A, a molding material supply section 42 capable of discharging molten resin is provided on the base 41.
A discharge flow passage 44 is formed in the discharge nozzle 43 at the tip of the molding material supply unit 42.

In the molding apparatus B, an upper fixing plate 49 having a mold clamping cylinder 48 attached thereto is installed on the upper ends of two pairs of front and rear tie bars 47 arranged side by side on the lower fixing plate 46, and an upper and lower fixing plate 49, Clamping cylinder 48 between 46
A movable platen 50 driven by the tie bar 47 is installed so as to be movable up and down, and an upper die 51 is attached to the lower surface of the movable platen 50.

A base end of the lower fixing plate 46 is fixed to the lower fixing plate 46 and extends horizontally toward the reflecting device A side.
A pair of left and right take-out frames 52 supported by the support columns 53 are installed in parallel with each other on the upper surface of the lower fixed plate 46 and an upper surface of the take-out frame 52 having a length about twice the length of the lower fixed plate 46. Guide rails 54 are laid in parallel.

A slide frame 56 having a lower die 55 fixed to the upper surface thereof is installed on the lower fixed platen 46, and two pairs of left and right wheels 56a rolling on both guide rails 54 are provided on the lower surface of the slide frame 56. It is rotatably supported.
The lower die 55 is guided by both guide rails 54 and moves together with the slide frame 56 to a position above the lower fixed platen 46 and a position above both take-out frames 52.

A pair of left and right slide cylinders 57 for moving the slide frame 56 forward and backward toward the reflecting device side and the ejecting device side are installed in parallel with the guide rails 54 near the left and right ends of the lower fixed plate 46. Both slide cylinders 5
The tip of the piston rod 57a of No. 7 is connected to the end of the slide frame 56 on the side of the reflecting device.

When the piston rods 57a of both slide cylinders 57 retreat to the retracted ends, the slide frame 5
6 and the lower die 55 are installed above the lower fixed platen 46, and the lower die 55 is arranged directly below the upper die 51. When the piston rods 57a of both slide cylinders 57 move to the forward / backward ends, the slide frame 56 and The lower die 55 is retracted from the lower fixed platen 46 and transferred onto the take-out frame 52, and the lower die 55 escapes from directly below the upper die 51 to the outside thereof.

The injection pipe 55b of the lower die 55 is provided with an injection passage 58 into which the molten resin pressure-fed from the injection device A is introduced, and the molten resin fed into the injection passage 58 has a lower die 55.
It is injected at a low pressure through an injection port 60 opened near the central portion of the molding surface 55a and is poured onto the molding surface 55a of the lower mold 55.

The flow path connecting device C projects from the first joint nozzle 1 mounted in abutting relation to the discharge nozzle 43 of the molding material supply section 42 of the injection device A and the injection pipe 55b of the lower mold 55 of the molding device B. It is provided with a second joint nozzle 2 that is attached in a combined shape and is separable from the first joint nozzle and that is joined together in a butt shape, and a clamp mechanism 29 that clamps and unclamps both joint nozzles 2 in the combined state.

The first joint nozzle 1 has an outer cylinder 3 having a through hole formed in the center thereof in a longitudinal shape, and an inner cylinder 3 which is installed in the outer cylinder 3 with a substantially equal gap over the entire length so as to be immovable so as not to rotate and move back and forth. And a cylinder 4. The outer cylinder 3 and the inner cylinder 4 are each formed by joining two members.

At the center of the first joint nozzle 1, there is an inlet 6 formed at the center of the rear end of the outer cylinder 3, the gap between the outer cylinder 3 and the inner cylinder 4, and the center of the front end of the outer cylinder 3. The first internal flow path 5 communicating with the outlet 7 formed in
The molten resin discharged from the discharge channel 44 is the first internal channel 5
It flows through the inside and is fed into the second joint nozzle 2.

A connection portion 3a screwed into the discharge nozzle 43 is formed at the rear end portion of the outer cylinder 3, and a flange portion 3b having a tapered surface on the rear side is annularly formed on the outer peripheral surface of the front end portion of the outer cylinder 3. At the center of the front end surface of the outer cylinder 3, a rear sealing surface 3c having a convex curved surface slightly protruding forward is formed. A first valve seat 8 in the shape of a conical surface is formed around the outlet 7 at the center of the front end of the outer cylinder 3 so that the diameter gradually increases toward the front.

A first valve rod 9 is inserted in the center of the inner cylinder 4 so as to be able to move forward and backward. A sliding portion 9a and a small diameter portion 9b connected to the front end of the sliding portion 9a and having an outer diameter slightly reduced from the outer diameter d1 of the sliding portion 9a are formed at the front portion of the first valve rod 9. In addition, the front end of the first valve rod 9 has a conical outer peripheral surface shape that is connected to the front end of the small diameter portion 9b and gradually increases in diameter toward the front. To the pressure receiving portion 9 which receives the fluid pressure in the first internal flow path 5.
c is formed.

On the outer peripheral surface of the pressure receiving portion 9c of the first valve rod 9, a pressure receiving surface 10 having a conical surface whose diameter gradually increases toward the front is formed, and at the front portion of this pressure receiving surface 10, the first valve seat 8 is formed. Has a conical surface shape that is close to that of the first valve seat 8 and has a contact surface 11 that contacts and separates from the first valve seat 8 to close and open the outlet 7.

The diameter d2 of the rear edge of the contact surface 11 is equal to the diameter of the rear edge of the first valve seat 8, and the diameter d3 of the front edge of the contact surface 11 is the diameter of the front edge of the first valve seat 8. And is set to the same length.

A spring bearing plate 22 is fitted in the vicinity of the rear end of the first valve rod 9, and the first valve rod 9 is elastically contacted with the spring bearing plate 22.
The spring 20 pushes the discharge nozzle 43 toward the return direction, and the contact surface 11 of the first valve seat 9 is pressed against the first valve seat 8 by the pressing force of the first spring 20.

The second joint nozzle 2 has an outer cylinder 14 having a shape that is substantially the same as the outer cylinder 3 of the first joint nozzle 1 reversed in the opposite direction. An inner cylinder 15 that is installed so as not to rotate and move back and forth and has a shape that is substantially the same as the shape in which the inner cylinder 4 of the first joint nozzle 1 is reversed in the opposite direction is provided. The outer cylinder 14 and the inner cylinder 15 are each formed by joining two members.

At the center of the second joint nozzle 2, an inlet 17 opened at the center of the rear end of the outer cylinder 14 and an outer cylinder 14 are provided.
A second internal flow passage 16 is formed in a vertically extending shape, in which a gap between the inner pipe 15 and the inner pipe 15 and an outlet 18 opened at the center of the front end of the outer pipe 14 communicate with each other, and is sent out from the first internal flow passage 5. The fluid flows through the second internal flow path 16 and is sent into the injection flow path 58.

A screw portion 14a formed on the front end of the outer cylinder 14
Is the flange 38 fastened to the injection pipe 55a of the lower mold 55.
A flange portion 14b having a tapered surface on the front side is annularly projectingly provided on the outer peripheral surface of the rear end of the outer cylinder 14, and both joint nozzles 1 and 2 are provided at the center of the rear surface of the outer cylinder 14. The rear sealing surface 3c of the first joint nozzle 1 when combined
Front sealing surface 14c with a concave curved surface that fits closely
Is recessed.

A first portion is provided on the front portion of the outer cylinder 14 around the inlet 17.
A conical surface-shaped second valve seat 19 having a maximum diameter of the valve seat 8, that is, a minimum diameter equal to the diameter d3 of the front edge of the contact surface 11 and gradually increasing in diameter toward the front is formed.

A large-diameter portion 23a at the rear is provided at the center of the inner cylinder 15.
And a small diameter portion 23b extending in front of the large diameter portion 23a.
And a second valve rod 23 that is concentrically and butt-contacted to the first valve rod 9 when the joint nozzles 1 and 2 are united, is inserted so as to be able to move forward and backward. ..

The outer peripheral surface near the rear end of the second valve rod 23 has a second
It has a shape that can be in close contact with the valve seat 19 and has the same shape as the second valve seat 19, closes and opens the inlet 17 by contacting with and separating from the second valve seat 19, and the first internal flow when separated from the second valve seat 19. A contact surface 24 for receiving the fluid pressure in the passage 5 is formed, and the contact surface 24 is formed as a conical surface having the maximum diameter d4 of the contact surface 11 of the first valve rod 9.

The diameters d1, d2 of the respective parts of the two valve rods 9, 23
In this example, d3 and d4 are set so that d1 <d2 <d3 <d4.

A spring receiving plate 26 is fitted to the rear end of the small diameter portion 23b of the second valve rod 23, and the second valve rod 23 is returned by a second spring 27 elastically contacted with the spring receiving plate 26. The contact surface 24 of the second valve rod 23 is pressed against the first joint nozzle 1 side and pressed against the second valve seat 19 by the pressing force of the second spring 27.

The pressing force with which the second spring 27 pushes back the second valve rod 23 is set to be equal to or greater than the pressing force with which the first spring 20 pushes back the first valve rod 9, and the first spring 20 moves the first valve at the retracted end position. When the pressing force for pushing back the rod 9 is P1 and the pressing force for pushing back the second valve rod 23 at the retracted end position by the second spring 27 is P2, P
It is set such that 1 <P2.

Further, the front end face of the second valve rod 23 arranged at a preset distance and the end face of the front slide hole 15c are brought into contact with each other, so that the first valve rod 9 is advanced by a predetermined distance and the first valve rod 9 is moved.
When the pressing force with which the first spring 20 pushes back the first valve rod 9 when the spring 20 is compressed is P3, and the second valve rod 23 is moved equidistantly with the first valve rod 9 and the second spring 27 is compressed. When the pressing force for the second spring 27 to push back the second valve rod 23 is P4,
It is set so that P4> P3.

With the contact surface 11 of the first valve rod 9 pressed against the first valve seat 8 and the contact surface 24 of the second valve rod 23 pressed against the second valve seat 19, both joint nozzles 1, 2
, The valve rods 9 and 23 are butted against each other while the internal flow passages 5 and 16 are blocked, and the front end face of the first valve rod 9 and the rear end face of the second valve rod 23 are in close contact with each other. To do. When both valve rods 9 and 23 move together in this state, both internal flow paths 5 and 16 are opened.

In the clamp mechanism 29 which locks and unlocks both joint nozzles 1 and 2 in a combined state,
A clamp mounting bracket 30 is fastened near the rear end of the outer cylinder 3 of the first joint nozzle 1, and one end of the clamp mounting bracket 30 extends along the first joint nozzle 1 to the side of the front end portion of the first joint nozzle. The rear end portion of the guide frame 31 that has been extended is fixed, and a pair of guide holes 31a are formed through the left and right end portions of the front end of the guide frame 31.

A cylinder body 33a of a clamp cylinder 33 having a piston rod 33b which is vertically driven by hydraulic pressure is vertically mounted on the central portion of a mounting plate 32 installed on one side of the front end portion of the guide frame 31. And a pair of tie bars 3 slidably mounted on the upper and lower ends of the mounting plate 32 in a vertically parallel manner and slidably inserted into both guide holes 31a of both guide frames 31.
The base end portions of 4, 34 are fastened.

At the tips of both tie bars 34, both flange portions 3b and 14b of the outer cylinders 3 and 14 of both joint nozzles 1 and 2, respectively.
The upper and lower ends of the first clamp member 35 that sandwiches one end of the first clamp member 35 and presses it in the approaching direction are fastened, and the flange portions 3b and 14b are partially fitted in the center of the inner end of the first clamp member 35. The engaging groove 35a is provided as a recess.

Piston rod 3 of clamp cylinder 33
When the piston rod 33b advances, the tip of 3b sandwiches the other end of both flange portions 3b, 14b of both outer cylinders 3, 14 to press in the approaching direction and the first clamp member 3
5, the central portion of the base end of the second clamp member 36 that clamps both flange portions 3b and 14b is connected, and the central portion of the inner end of the second clamp member 36 connects both outer cylinders 3 and 14. Engagement groove 36a into which a part of the flange portions 3b and 14b is fitted
Is recessed.

When the piston rod 33b of the clamp cylinder 33 advances with the joint nozzles 1 and 2 combined, the first clamp member 35 moves together with the cylinder body 33a toward both flange portions 3b and 14b, and the second clamp portion The member 36 moves to the both flange portions 3b and 14b side together with the piston rod 33b, and the both flange portions 3b and 14b of the both outer cylinders 3 and 14 are clamped by both clamp members 35 and 36 and pressed in the approaching direction. Both joint nozzles 1 and 2 are clamped with the front and rear sealing surfaces 3c and 14c of the outer cylinders 3 and 14 in close contact with each other.

When the piston rod 33b of the clamp cylinder 33 retracts in this state, the first clamp member 35 and the second clamp member 36 are moved to both flange portions 3b and 14b.
The joint nozzles 1 and 2 in the clamped state are unclamped apart from the position.

After the plasticization is completed, the molten resin is discharged into the first internal flow path 5, the fluid pressure in the first internal flow path 5 is gradually increased, and the first and second springs 20 and 27 are both valves. When the return force (P1 + P2) for pushing back the rods 9, 23 is exceeded, both valve rods 9,
23 starts to move, the fluid pressure continues to rise, and both valve rods 9 and 23 move to the moving end, so that the outlet 7 and the inlet 16 are fully opened. When moving both valve rods 9 and 23, P2> P
1, P4> P3, the force of pushing back the second valve rod 23 is larger than the force of pushing back the first valve rod 9, so that both valve rods 9 and 23 always move in a contacting state, The fluid is prevented from entering between the front end surface of the first valve rod 9 and the rear end surface of the second valve rod 23.

In this state, the molten resin whose pressure has been increased to the required fluid pressure is sent from the outlet 18 into the injection passage 58 through both internal passages 5 and 16, and the injection surface 60 to the molding surface of the lower die 55. It is injected at low pressure onto 55a.

When the fluid pressure in both internal flow paths 5 and 16 gradually decreases and becomes O while the fluid pressure becomes (P3 + P4) or less, both valve rods 9 and 23 start to retreat, and As the fluid pressure decreases, the restoring force applied to both valve rods 9 and 23 is P
3 → P1, P4 → P2 and both valve rods 9 and 23 recede, both contact surfaces 11 and 24 are in close contact with both valve seats 8 and 19, respectively, and the outlet 7 and the inlet 17 are fully opened. .. At this time, since P4> P3 and P2> P1, both valve rods 9,
23 always keeps the contact state and retreats, and both valve rods 9, 23
The molten resin is prevented from entering the gap.

In this state, even if the joint nozzles 1 and 2 in the clamped state are unclamped and the molding material supply section 42 is retracted together with the first joint nozzle 1 and both joint nozzles 1 and 2 are separated, the first joint Since the outlet 7 of the nozzle 1 and the inlet 18 of the second joint nozzle 2 are sealed by both valve rods 9 and 23, respectively, the outlet 7
And leakage of the molten resin from the inlet 17 is caused by both valve rods 9, 23.
Blocked by.

Next, a method of molding a molded product using the above-mentioned low-pressure injection molding machine will be described. While the movable platen 50 of the molding apparatus B moves downward and the upper mold 51 descends toward the lower mold 55 (during the descent or at the time of temporary stop during the descent), the molding material supply unit 42 molds. The first joint nozzle 1 and the second joint nozzle 2 are joined together in a butt shape as they move toward the device B side, and clamped in a coupled state by the clamp mechanism 29.

In this state, the molten resin plasticized in the molding material supply section 42 is sent from the discharge flow path 44 of the molding material supply section 42 into the first internal flow path 5 of the first joint nozzle 1.

When both the internal flow paths 5 and 16 are opened and the molten resin is sent into the injection flow path 58 of the lower mold 55, and a predetermined amount of the molten resin is injected onto the molding surface 55a of the lower mold 55, The supply of the molten resin from the molding material supply unit 42 into the first internal flow path 5 is stopped, and the upper mold 51 descends to the descending end. When the supply of the molten resin into the first internal flow passage 5 is stopped, the fluid pressure in both internal flow passages 5 and 16 is reduced, and the outlet 7 and the inlet 17 thereof are sealed by the two valve rods 9 and 23.

When the upper die 51 descends to the lower end, the lower die 55
The molten resin on the molding surface 55a of the
And a molding surface 55a of the lower mold 55 are pressed to mold a molded product having a predetermined shape.

After the molding is completed, the movable platen 50 retreats upward by the molding completion signal and the upper die 51 rises, and the piston rod 33a of the clamp cylinder 33 retreats to clamp the joint nozzles 1 and 2. Is released,
The molding material supply unit 42 retracts together with the first joint nozzle 1, and the joint nozzles 1 and 2 are separated.

Simultaneously with the retreat of the molding material supply unit 42, the piston rod 57a of the slide cylinder 57 is moved by the molding completion signal to move the slide frame 56 and the lower mold 5.
5. The second joint nozzle 2 moves to the take-out station on the take-out frame 52, and the lower die 55 and the molded product on the lower die 55 are ejected from directly under the upper die 51 and transferred onto the take-out frame 52. ..

In this state, the molded product is taken out by the take-out robot and carried out to the next step, or
The composite material such as the skin and the insert parts is supplied and set on the lower mold 55 by the composite material supply device, and the slide cylinder 5
The piston rod 57a of 7 retreats and the slide frame 56 returns to the position directly below the upper mold 51 together with the lower mold 55.
In this state, the molded product and the composite material are integrally molded or insert-molded by the upper and lower molds 51 and 55, and then the upper mold 51 is raised and the piston rod 57a of the slide cylinder 57 is advanced again to move the slide frame 56 and the lower mold. 5
5 and the molded product escape from right under the upper die 51 and are transferred onto the take-out frame 52. In this state, the molded product is taken out by the take-out robot and carried out to the next step.

After the completion of taking out the molded product, the piston rod 57a of the slide cylinder 57 retracts to the injection device A side, and the lower die 55 and the slide frame 56 move to the lower fixing plate 46.
It returns to the upper position to complete one molding cycle.

Next, the operation and effect of the embodiment having the above-mentioned structure will be described. In this example, while the upper mold 51 of the molding apparatus B is descending toward the lower mold 55, the molding material supply section 42 of the injection apparatus A is moved to the molding apparatus B side and attached to the molding material supply section 42. Internal flow path 5 of 1 joint nozzle 1 and 2nd joint nozzle 2 attached to lower mold 55
Of the molten resin from the discharge flow channel 44 of the molding material supply unit 42 to the both internal flow channels 5, 1
The lower mold 5 is fed to the injection channel 58 of the lower mold 55 via 6
5, the upper die 51 is lowered to the descending end to form a molded article between the upper die 51 and the lower die 55, and then the lower die 55 together with the molded article. It is configured to be moved to escape from directly under the upper mold 51.

Therefore, after each molding process, the lower die 55 moves out from directly below the upper die 51 to the take-out station where the upper side and the both sides are opened and moves to a position where the molded article can be taken out easily. Space can be secured, so that it is possible to simplify the take-out device by simplifying the take-out operation of the molded product by the take-out device and the transfer operation to the automatic transfer device, making it easy to fully automate the molding line. In addition, since the take-out device can be attached to the molding apparatus B, the installation space of the take-out device can be saved.

Further, since the number of times of handling required for taking out the molded product can be reduced and the operation for taking out and delivering the molded product can be speeded up, the work for taking out the molded product and the delivery work to the automatic transfer device can be efficiently carried out. The molding cycle time can be shortened.

Further, since the lower die 55 can be removed from the lower side of the upper die 51, the replacement work of the lower die 55 can be simplified and streamlined.

Further, in this example, when the injection device A and the molding device B are separated and connected by the flow path connecting device c, both valve rods 9 and 23 are always advanced and retracted in a contacting state so that both internal flows. Since the passages 5 and 16 are opened and closed, it is possible to accurately prevent the fluid from being trapped between the valve rods 9 and 23 from the start of the pressure feed of the molten resin to the end of the pressure feed.

Therefore, the generation of cold slag due to fluid leakage and fluid confinement can be eliminated, molding defects and connection defects due to cold slag can be eliminated, and the removal and cleaning work of leaked fluid can be eliminated. You can

In particular, when the so-called mold slide molding, in which the flow path is connected and disconnected for each molded product, the above-mentioned troubles that occur every time the connection and disconnection are made can be solved, so that the work efficiency is improved and the quality of the molded product is improved. Can be stabilized.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a low-pressure injection molding machine of the present invention.

FIG. 2 is a side view of a lower mold moving mechanism of the molding apparatus.

FIG. 3 is likewise a cross-sectional view of a flow path connection device.

FIG. 4 is a cross-sectional view of the flow path connection device showing a state in which both joint nozzles are separated.

FIG. 5 is a cross-sectional view of the flow channel connection device showing a state in which both internal flow channels of both joint nozzles are opened.

FIG. 6 is a front view of a clamp mechanism of the flow path connection device.

FIG. 7 is an enlarged cross-sectional view of a main part of the flow path connection device.

FIG. 8 is a schematic side view of a conventional high-pressure vertical injection molding machine.

[Explanation of symbols]

 A injection device B molding device C flow path connection device 1 first joint nozzle 2 second joint nozzle 43 discharge flow path 51 upper mold 55 lower mold 58 injection flow path

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Noriyuki Kanie 3-42, 9-chome, Minato-ku, Nagoya, Aichi Prefecture Sato Iron Works Co., Ltd. (72) Harumi Yamami 3-chome, 9-chome, Minato-ku, Nagoya, Aichi 42 Sato Iron Works Co., Ltd. (72) Inventor Hiroshi Miura 3-chome 9 Minato-ku, Nagoya City, Aichi Prefecture 42 Address Sato Iron Works Co., Ltd. (72) Inventor Yasuhiro Sato 3-chome 9, Minato-ku, Aichi Prefecture 42 Sato Iron Works Co., Ltd.

Claims (2)

[Claims] 1. A first device mounted on the molding material supply unit by advancing a molding material supply unit of a lateral supply type injection device to the side of a vertical mold clamping system molding device having a lower mold and an upper mold. The molten resin is supplied to the molding material after the internal flow path of the joint nozzle and the internal flow path of the second joint nozzle attached to the lower mold are connected in series and before the upper mold descends to the descending end. From the discharge flow path of the lower part to the injection flow path of the lower mold via the both internal flow paths to start the injection of the molten resin onto the molding surface of the lower mold, while injecting the molten resin. Alternatively, after the injection of the molten resin is completed, the upper mold is lowered to the lower end to form a molded product between the upper mold and the lower mold,
A low-pressure injection molding method, characterized in that the lower mold is moved together with a molded article so as to be escaped from directly under the upper mold. 2. A molded product is molded between a lower mold having a molding surface into which the molten resin injected at a low pressure is poured in front of an injection device for laterally pumping the molten resin, and the lower mold when descending. A molding device having an upper mold and a lower mold moving mechanism that causes the lower mold to be molded together with a molded product to escape from directly below the upper mold is installed, and the injection device is provided between the injection device and the molding device. First attached to the molding material supply part of the device
A low-pressure injection molding machine comprising a flow path connection device in which a joint nozzle and a second joint nozzle attached to the lower mold are coupled in a butt shape so as to be separable from each other.