JPS61181623A - Inclined plane injection molding machine with hot runner - Google Patents

Abstract

PURPOSE:To make an injection molded shape runnerless leaving no sprue gate thereby excluding the finishing operation, by causing a nozzle of an injection unit to nozzle touch one end of a hot runner manifold, extending a runner through the middle of the hot runner manifold, and providing small nozzles. CONSTITUTION:An injection unit (C) is allowed to move on a base bed 9 in directions shown by a double arrow 10, and when clamping is effected at a clamping center X-X, the injection unit (C) nozzle touches at 11. T-shaped runner 13 are branched from the central part of the longitudinal runner 12 of the hot runner manifold 1, small nozzles 14 are provided, and injection is carried out from gates 15 into cavities 16. A rod 18 having a hydraulic cylinder 17 is provided to the other end of the longitudinal runner via a certain dwell, and the rod 18 is retracted to a position (E) from a stop line (B) after the injection. The gate 15 near the cavity 16 can be sucked into the T-shaped runner 13 and can be cut and melted by the vacuum produced in a space (D) between the stop line (B) and the position (E) with the retraction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention aims to reduce the installation area of an injection molding machine, and also achieves
The molding capacity of the molded products obtained by the shot is twice that of the conventional method, and the loss of molded products such as spool gates, traces, and finishing work are also eliminated.

Furthermore, we aim to provide a molding machine that can double the cutting efficiency of conventional molding methods.

[Conventional technology]

Conventionally, there was a molding machine of this type called Japanese Patent Publication No. 50-5216, but the mold clamping center and two-pair injection unit moved the nozzle touch center to overlap or touch the orthogonal nozzle to the parting line of the rough mold. The method used was to branch out to both sides or one side of the back of the cavity (two direct large runners were run vertically and the runners were branched from the center) and inject into both cavities (two injections). (The two-person runner and spool gate are the same as the molded product.C: The two-person runner and spool gate are separated from the molded product by ejecting C2 outside the mold, and the large runner and spool gate are separated from each other, which requires complicated finishing and crushing processes after molding.) 7 Today, -5 to 1 molding workers
Under circumstances where it is necessary to operate a molding machine such as zero-containing
However, it has also become difficult to perform complex work such as the one described above.

[Problem that the invention seeks to solve]

The present invention aims to eliminate the above-mentioned drawbacks, and also makes the injection molded product runnerless so that no spool gate remains on the molded product, thus eliminating the need for finishing work.

[Means to solve the problem]

In the present invention, the nozzle of the injection unit is touched to the middle position of the tie bar, and the back side of the cavity is constantly heated to an appropriate temperature (about 1 shot) from the hot runner manifold in the center of the X-cutting mold. There is a compound waiting at the screw tip and inside the hot runner.The tip nozzle of the injection unit touches the end face of the hot runner manifold, and the large runner of the manifold branches into a T-shaped runner. When injection is completed into both sides of the stacked type I-shaped cavities in the left side set configuration, the large and small runners are depressurized by the retreat of the hydraulic rod at the rear end C2 of the runner, and the opening gate of the cavity is also applied with the above-mentioned reduced pressure. By applying suction force inside the hot runner, the gate can be cut from the cavity, melted into the runner for the next cycle, and suctioned into the subsequent runner without any problems.

Therefore, no gate remains on the injection molded product and no finishing work is required. At the same time, a hot runner is used to create an electric clamp on the left stone under the same mold clamping force, which doubles the mold clamping force. It has the feature that any molded product can be efficiently made using a mold.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

Bracket A is of type TII#, and has a movable surface plate 4 equipped with a hot runner manifold 1 between a fixed plate 2 and a movable plate 3, and two sets of molds, male and female, on the left and right sides. 5 and 6 respectively, and one illustration shows a ram 8 that fits into the direct pressure type mold clamping cylinder 7, but a movable ram 8 that can be inserted into the direct pressure mold clamping cylinder 7 can be used with four toggles.
The two molds 5 and 6 are connected to each other to open and close the two sets of molds 5 and 6.

The injection unit C moves forward and backward on the base 9 as shown by the arrow 10, and when M is closed at the mold clamping center X-X, the injection machine (N) O touches the nozzle 11 and presses the hot button. From the center of the longitudinal runner 12 of the runner manifold 1'
It branches into an F-shaped runner 13, interposes a small nozzle 14, and is injected from a gate 15 into a cavity 16. At the other end of the longitudinal runner, a rod 18 with oil pressure #17 is provided after holding pressure at a certain time. After injection, the rod 18 retreats from the stop line B to the position E. During this time, as it retreats, it moves along the stop line B,
! : Due to the vacuum force generated in the space E, a certain gate 15 is moved closer to the cavity 16 by the T-shaped runner 13.
It can be dissolved by suction cutting.

As mentioned above, the molded product of the present invention does not leave a spool gate unlike the conventional one, and does not require any finishing work.

In the present invention, the gate 15 has a small diameter and is short, and the small nozzle 149 integrated with the T-shaped runner 13 is close to the cavity 16. The short thin gate 15 is opened to the cavity 16, and after injection, the T-shaped runner 13 and the gate 15 C:
In this case, the residual pressure car cut-off during injection is eliminated, and during the first cycle (the double nose phenomenon etc. does not occur).In other words, the rod 18 waits for the gate to cool during a certain period of pressure holding after injection, and then the rod 18 reaches H. Retract to the line and repeat B'1as = restoration at the time of injection. Symbol 1
Space 9 is for hot runner manifold l and rod 18
This is to prevent heat transfer from the manifold 1 to the rod 181 in the moving space. The small nozzle 14 is equipped with a heater 14' to maintain a separate temperature control means.

The hot runner manifold 1 shown in FIG. 3 is a plan view of a hot runner manifold for molding small articles, etc., in which the hot runner small nozzles 14 are arranged in a criss-cross shape (two or three pieces) by slightly modifying the above embodiment. .

According to this example, multi-cavity molding is easy, and small nozzles do not require large-scale equipment investment.

However, when using a conventional mold without using the overlapping mold of the present invention, it is also easy to move the injection unit C to the mold clamping center line of the fixed platen 2.

That is, the conventional mold can be easily used by touching the forward nozzle along arrow 101 during injection and moving back slightly after injection.

[Brief explanation of drawings]

Fig. 1 is a plan view of the injection molding machine of the present invention, Fig. 2 is a partially enlarged view of Fig. 1, and Fig. 3 is a slightly modified embodiment in which the hot runner has two or three small nozzles in a cross shape. A plan view of the hot runner manifold as installed is shown. 1.Hot runner manifold, 2.Fixed plate, 3
...Movable lock, 4.Movable surface plate, 5.Male mold, 6.Female mold, 11.Nozzle touch, 12.Vertical runner,
14...Small nozzle, 15...Gate, 16...Cavity.

Claims (1)

[Claims] (1) A hot runner manifold is installed in the center of the fixed platen and movable platen of the mold clamping device, and the nozzle of the injection unit touches one end of the hot runner manifold, and the runner is run vertically from the center of the hot runner manifold, and the hot runner manifold is placed in the mold. This slope injection molding machine is characterized by branching from the tightening center line, intervening a small nozzle, and injecting into the stacked molds at once through gates in the cavities of both molds.