JP3589264B2 - Gate cutting device in mold structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gate cutting device in a mold structure that is a plastic molding mold.
[0002]
[Prior art]
The resin injection port (gate) of the molded product is indispensable for molding, but is extraneous from the viewpoint of product functions, and in general, removal is dependent on human labor, which increases the cost of the product. It will be connected.
[0003]
As a countermeasure, an automatic gate cutting method in a mold using a two-stage protrusion mechanism has been conventionally considered. In this in-mold automatic gate cutting method, as shown in FIG. 4, a protruding pin 8 having a flange portion 8A is mounted near the gate 4 of the movable mold 10, and in the molded product protruding step, the protruding timing of the gate 4 is determined. The gate 4 can be automatically cut by delaying the amount of H from 1.
[0004]
That is, in addition to the gate protruding pin 8 having the flange 8A near the gate 4, the sprue protruding pin 12 having a function of pulling out the sprue 14 when the mold is opened is provided. The sprue protrusion pin 12 is also provided with a flange 12A.
[0005]
The reason is that in the case of the gate projecting pin 8, the pin bottom receiving when the mold is closed is received by the surface of the movable side mounting plate 2, but the sprue projecting pin 12 is formed by the projecting rod hole 2A formed in the movable side mounting plate 2. This is because the pin cannot be received on the bottom of the pin because of the concentricity.
[0006]
Therefore, as shown in FIG. 4, a receiving member 13 for receiving the flange portion 12A of the sprue projecting pin 12 is provided below the movable mold 10, and this receiving member 13 is used to return the sprue projecting pin 12 when the mold is closed. The flange 12B at the lower end of the sprue projecting pin 12 is used when projecting.
[0007]
That is, after the movable mold 10 and the movable mounting plate 2 are lowered from the state before the mold opening after filling with the resin as shown in FIG. 4 and the mold is opened, as shown in FIG. The rod 9 rises and pushes down the plate 7B. For this purpose, the sprue protruding pin 12, the gate protruding pin 8, and the molded product protruding pin 6 are pushed up through the respective flange portions 12B, 8A, 6A, so that the sprue protruding pin 12 moves the sprue 14 and the gate protruding pin 8 moves. the run-toner 5, the molded article ejector pins 6 push up the molded article 1, respectively, sprue 14, run-donor 5 and the molded article 1 is projected.
[0008]
However, in the state before the mold opening after the resin filling (the state in FIG. 1), there is a gap H between the lower surface of the flange portion 12A of the sprue protrusion pin 12 and the lower protrusion plate 7B. Until the lower protruding plate 7B is pushed up, that is, the molded product 1 is protruded and the gap H disappears, the sprue protruding pin 12 does not operate, and therefore, the sprue 14 is not protruded. The gate 4 is cut by utilizing the shift in the timing of the protrusion.
[0009]
[Problems to be solved by the invention]
Meanwhile, in the above-described conventional mold structure, a receiving member 13 for receiving a flange 12A of a sprue projecting pin 12 is provided below the movable mold 10, and the receiving member 13 is attached to the sprue when the mold is closed. The sprue protrusion 12 is used as a catch for the return of the protrusion pin 12, and the protrusion 12 </ b> B at the lower end of the sprue protrusion pin 12 is used at the time of protrusion. Therefore, two flanges of the sprue protrusion pin 12 are required. There is a problem that the receiving member 13 for receiving the flange 12A of the protruding pin 12 is required, and the mold structure becomes complicated.
[0010]
The present invention has been made in view of the above-described problems, and the object thereof is to eliminate the need for two flange portions of the sprue protrusion pin, and to eliminate the need for a receiving member for receiving the flange portion. Accordingly, an object of the present invention is to provide a gate cutting device in a mold die structure that can simplify a die structure and contribute to a reduction in die cost.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a gate cutting device in a mold mold structure according to the present invention has a fixed mold fixed to a fixed mounting plate, and is fixed to a movable mounting plate via a spacer block. A movable mold, and an upper and lower protruding plate movably provided between the movable mold and the movable mounting plate, and by pushing up the lower protruding plate, a sprue protruding pin, a gate protruding pin and molding are formed. pushes goods ejector pins respectively, said sprue ejector pin sprue, the gate projecting pins runner, the molded article ejection pin molded article in mold structure projecting respectively, the intermediate portion of the gate ejector pins A flange is provided, and the flange is made thinner than the flange at the end of the molded product projecting pin and the flange at the end of the sprue projecting pin. The flange of the projecting pin, together with the flange of the molded product projecting pin and the flange of the sprue projecting pin, is located between the upper and lower projecting plates, and the end face of the gate projecting pin is movable. Receiving on the surface of the side mounting plate, in a state before the mold opening after filling with resin, a gap exists between the lower surface of the flange portion of the gate protrusion pin and the lower protrusion plate, and the gate protrusion operation is performed. characterized that you lag behind both projecting actuation protruding operation and the molded article ejector pins of the sprue ejector pins.
[0012]
Conventionally, sprue, during the run-donor and molded articles is protruded, sprue ejector pin does not operate until the molded article has a gap H is eliminated are projected, therefore, sprue has not been projected. The gate is cut by utilizing the deviation of the timing of the protrusion, but in the present invention, the gate protruding pin does not operate until the molded product is protruded by the operation delay means until the gap H disappears. The gate is not protruding. The gate is cut by using the timing shift of the protrusion, and the sprue protrusion pin is not directly related to the gate cutting. Since a receiving member for receiving the portion is unnecessary, the mold structure is simplified, and the cost of the mold can be reduced.
[0014]
Further, with this configuration, in the state before the mold is opened after filling with the resin, since there is a gap between the lower surface of the flange portion of the gate protrusion pin and the lower protrusion plate, the lower protrusion plate is pushed up. In other words, the gate protruding pin does not operate until the molded product is protruded and no gap is left, and therefore the gate is not protruded. The gate is cut by utilizing the shift in the timing of the protrusion.
[0015]
Therefore, since the sprue protrusion pin is not directly related to the gate cutting, two flange portions of the sprue protrusion pin are not required, and a receiving member for receiving the flange portion is unnecessary, and the mold structure is simplified. And the cost of the mold can be reduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a mold structure provided with a gate cutting device according to the present invention, showing a state before filling and opening of a mold after filling with a resin. FIG. FIG. 3 is a partially omitted cross-sectional view showing a state in which the protruding step is completed in the same mold structure.
[0017]
The mold structure includes a fixed mold 11 and a movable mold 10. The fixed mold 11 is fixed to a fixed mounting plate 15, and the movable mold 10 is a spacer block. 16 is fixed to the movable side mounting plate 2. A mold portion 10A is formed on the lower surface of the fixed mold 11, and a gate forming member 18A is attached to the center of the fixed mounting plate 15, and the gate forming member 18A is a fixed mold. 11 penetrates the central part.
[0018]
Further, a pin insertion hole 18 is provided at the center of the movable mold 10, and a runner 19 communicating with the upper end of the pin insertion hole 18 is formed at the upper surface of the movable mold 10. It is. The movable mold 10 is provided with a gate projecting pin hole 20 and a plurality of molded product projecting pin holes 21, and the upper end of the gate projecting pin hole 20 is located at the end of the runner 19. It is open at the bottom, and the upper end of the molded product projecting pin hole 21 is open to the projection of the mold portion 10A on the upper surface of the movable mold 10.
[0019]
Upper and lower protruding plates 7A and 7B are provided between the movable mold 10 and the movable mounting plate 2 so as to be able to move up and down. These upper and lower protruding plates 7A and 7B When the mold is closed, a set (usually four) of slidable return pins 17 guided by the movable-side mold 10 is attached to the movable-side mounting plate by the mold dividing surface 3 of the fixed-side mold 11. As it is returned to the second side, it is returned in the same manner.
[0020]
The upper protruding plate 7A has a pin insertion hole 22 located on an extension of the pin insertion hole 18, a gate projection pin hole 23 located on an extension of the gate projection pin hole 20, and a molded product projection. A molded product projecting pin hole 24 located on the extension of the pin hole 21 is provided. The lower projecting plate 7B has an escape hole 25 located on the extension of the gate projecting pin hole 20. Is provided.
[0021]
A sprue protrusion pin 12 is inserted into the pin insertion holes 18 and 22 so as to be vertically slidable. A flange 26 is formed at the lower end of the sprue protrusion pin 12, and a lower surface of the flange 26 is formed. The portion is in contact with the upper surface of the lower protruding plate 7B. A molded product protruding pin 6 is inserted into the molded product protruding pin holes 21 and 24 so as to be vertically slidable. A flange 27 is formed at the lower end of the molded product protruding pin 6. The flange 27 has the same thickness as the flange 26 of the sprue projecting pin 12, and the lower surface of the flange 27 is in contact with the upper surface of the lower projecting plate 7B.
[0022]
A gate protruding pin 8 is inserted into the gate protruding pin holes 20 and 23 so as to be vertically slidable. The gate protruding pin 8 has a flange portion 28 at an intermediate portion thereof, and the flange portion 28 is thinner than the flange portion 27 of the molded product protruding pin 6 and the flange portion 26 of the sprue protruding pin 12. The difference is H.
[0023]
The gate protruding pin 8 is inserted into the gate protruding pin holes 20 and 23 so as to be vertically slidable above the flange 28, and the pin portion 8A below the flange 28 of the gate protruding pin 8 is The flange 28 is located between the upper and lower protruding plates 7A and 7B, and the lower end surface of the pin 8A is received by the surface of the movable mounting plate 2. I have. Therefore, a gap H exists between the lower surface of the flange 28 of the gate projecting pin 8 and the lower projecting plate 7B.
[0024]
The movable mounting plate 2 is provided with a protruding rod hole 2A, and a protruding rod 9 of the molding machine is located below the protruding rod hole 2A.
[0025]
Next, the protrusion of the molded product in the mold structure configured as described above will be described.
As shown in FIG. 1, after the movable mold 10 and the movable mounting plate 2 are lowered from the state before the mold opening after filling with the resin and the mold is opened, the protruding rod 9 of the molding machine as shown in FIG. Rises to push up the lower protruding plate 7B. For this purpose, the sprue projecting pin 12 and the molded product projecting pin 6 are pushed up through the respective flanges 26 and 27, and the sprue projecting pin 12 and the molded product projecting pin 6 respectively push the sprue 14 and the molded product 1. By pushing up, the sprue 14 and the molded product 1 are projected.
[0026]
In the state before the mold opening (the state in FIG. 1) after filling the resin, the gap H exists between the lower surface of the flange portion 28 of the gate protrusion pin 8 and the lower protrusion plate 7B. The gate protruding pin 8 does not operate until the protruding plate 7B is pushed up, that is, the molded article 1 is protruded and the gap H disappears, and thus the gate 4 is not protruded. The gate 4 is cut by utilizing the shift in the timing of the protrusion.
[0027]
Next, as shown in FIG. 3, the molded product 1 is protruded by pushing up the lower protruding plate 7 </ b> B, and at the same time, the gate protruding pin 8 is pushed up via the flange portion 28 and cut by the gate 4. The runner 5 is projected.
[0028]
Note that the sprue protrusion pins 12 other than the vicinity of the gate 4 do not have the above-described timing shift and protrude at the same time as the molded product 1, so that the runner 5 is located between the vicinity of the gate 4 and the rest. Although it is deformed as shown in FIG. 2, there is no influence on the molding operation and the molding quality.
[0029]
【The invention's effect】
As described above, according to the gate cutting device in the mold structure according to the present invention, the fixed mold fixed to the fixed mounting plate, and the movable mold fixed to the movable mounting plate via the spacer block. An upper and lower protruding plate is movably provided between the movable mold and the movable mounting plate, and by pushing up the lower protruding plate, a sprue protruding pin, a gate protruding pin, and a molded product are provided. pushes the projecting pins each collar said sprue ejector pin sprue, the gate projecting pins runner, the molded article ejection pins in the molding die structure projecting moldings to each, the middle portion of the gate ejector pins The flange is thinner than the flange at the end of the molded product projecting pin and the flange at the end of the sprue projecting pin. The flange portion of the extension pin is located between the upper and lower projecting plates together with the flange portion of the molded product projecting pin and the flange portion of the sprue projecting pin, and the end face of the gate projecting pin is movable. Receiving on the surface of the side mounting plate, in a state before the mold opening after filling with resin, a gap exists between the lower surface of the flange portion of the gate protrusion pin and the lower protrusion plate, and the gate protrusion operation is performed. by the this delaying from both of the protruding operation of the ejector operation and the molded article ejector pins of the sprue ejector pin, gate ejector pin does not operate until formed molded product has a gap H is eliminated are projected, therefore, the gate Not protruding. The gate is cut by using the timing shift of the protrusion, and the sprue protrusion pin is not directly related to the gate cutting. Since a receiving member for receiving the portion is unnecessary, the mold structure is simplified, and the cost of the mold can be reduced.
[0030]
Further, the present invention is that the flange portion is provided at an intermediate portion of the front Symbol gate ejector pin, the flange portion, thinner than the flange portion of the end portion of the flange portion and the sprue ejector pin end of the molded article ejector pins And positioning the flange portion of the gate projecting pin together with the flange portion of the molded product projecting pin and the flange portion of the sprue projecting pin between the upper and lower projecting plates, and A configuration in which an end surface is received by the surface of the movable-side mounting plate, and a gap exists between the lower surface of the flange portion of the gate projecting pin and the lower projecting plate in a state before the mold is opened after filling with resin. Therefore, in a state before the mold opening after filling the resin, since there is a gap between the lower surface of the flange portion of the gate protrusion pin and the lower protrusion plate, the lower protrusion plate is pushed up. That is, the molded product is protruded and has no gap Gate ejector pin does not operate until that, therefore, the gate is not projected. The gate is cut by utilizing the shift in the timing of the protrusion.
[0031]
Therefore, since the sprue protruding pin is not directly related to the gate cutting, two flange portions of the sprue protruding pin are not required, and a receiving member for receiving the flange portion is unnecessary, and the mold structure is simplified. And the cost of the mold can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a mold structure provided with a gate cutting device according to the present invention, in a state after a resin is filled and before a mold is opened.
FIG. 2 is a partially omitted cross-sectional view showing a state where a molded product after opening the mold is protruded and a gate is cut in the mold structure.
FIG. 3 is a partially omitted cross-sectional view of the mold structure in a state where a protruding step is completed.
FIG. 4 is a cross-sectional view of a mold structure provided with a conventional gate cutting device, in a state after resin filling and before mold opening.
FIG. 5 is a partially omitted cross-sectional view showing a state where a molded product after the mold is opened is protruded and a gate is cut in the mold structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Molded product 2 Movable mounting plate 3 Mold dividing surface 4 Gate 5 Runner 6 Molded product protruding pin 7A Upper protruding plate 7B Lower protruding plate 8 Gate protruding pin 9 Protruding rod 10 Movable mold 11 Fixed side mold 12 Sprue protruding Pin 14 Sprue 15 Fixed side mounting plate 16 Spacer blocks 26, 27, 28 Flange

Claims (1)

A fixed-side mold fixed to the fixed-side mounting plate, and a movable-side mold fixed to the movable-side mounting plate via a spacer block, and upper and lower portions are provided between the movable-side mold and the movable-side mounting plate. A side projecting plate is movably provided, and by pushing up the lower projecting plate, a sprue projecting pin, a gate projecting pin and a molded product projecting pin are respectively pushed up, the sprue projecting pin serves as a sprue, and the gate projecting pin serves as a runner. In the mold die structure in which the molded product projecting pins project molded products,
A flange is provided at an intermediate portion of the gate projecting pin, and the flange is thinner than a flange at an end of the molded product projecting pin and a flange at an end of the sprue projecting pin. The flange, together with the flange of the molded product projecting pin and the flange of the sprue projecting pin, is located between the upper and lower projecting plates, and the end face of the gate projecting pin is attached to the movable side mounting plate. In the state before the mold is opened after filling the resin, a gap is present between the lower surface of the flange portion of the gate protrusion pin and the lower protrusion plate, and the gate protrusion operation is performed by the sprue. gate cutting device in a molding die structure characterized that you lag behind both projecting actuation protruding operation and the molded article ejector pins of the ejector pin.

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