KR102281139B1 - Injection mold with side gate automatic cutting apparatus - Google Patents

Abstract

The present invention relates to an injection mold having an automatic side gate cutting device, comprising: an upper core installed in an upper mold and having an upper product groove; a core installed in the lower mold and provided with a lower product groove forming a cavity together with the upper product groove; a cutting punch that is provided to be slidable up and down on the lower core and cuts the side gate; an upper operating pin provided slidably on the upper core and moving up and down in conjunction with the cutting punch; a cylinder installed on the side of the lower mold; and a cam unit installed under the cutting punch in the lower mold and configured to raise and lower the cutting punch up and down according to the operation of the cylinder, wherein when the cutting punch rises to cut the side gate, the The residue of the side gate remains between the cutting punch and the upper operation pin, and when the upper core and the lower core are opened, the upper operation pin moves downward to discharge the residue to the outside.

Description

Injection mold with side gate automatic cutting apparatus

The present invention relates to an injection mold, and more particularly, to an injection mold having an automatic side gate cutting device that is installed inside the injection mold and can automatically cut the side gate from the injection molded product.

In general, injection molding is a manufacturing method widely used for molding plastic products.

Injection molding is a method of making an injection product corresponding to the shape of the cavity by injecting the molten resin in a heating cylinder into the cavity of the injection mold at high pressure to solidify or harden it.

In general, an injection mold is formed of a material such as a metal having excellent heat resistance, and a cavity, which is a space formed in a shape corresponding to an injection product to be manufactured, a sprue into which the molten resin is injected, and a cavity in which the molten resin injected through the sprue is injected. It may be composed of a runner distributed and supplied to the furnace, and a side gate that is formed to have a relatively small cross-sectional area compared to the runner and controls the flow of molten resin injected into the cavity.

When the molten resin is injected into the injection mold configured as described above, the molten resin is filled into the cavity through the sprue, the runner, and the side gate, and then cooled and solidified over time.

When the molten resin is solidified, the injection mold is opened to take out the injection molded product. However, since the molten resin filling the cavity, the side gate, the runner, and the sprue is solidified integrally, it adheres to the solidified injection product in the cavity and is taken out together.

At this time, since the required product is an injection molded product corresponding to the cavity, it is necessary to cut the side gate attached to the injection molding product. The operation of removing the side gate from such an injection molded product is usually done manually, and this has a problem in that the number of work hours increases, thereby increasing the manufacturing cost.

In addition, if the side gate is removed by cutting it manually, there is a problem that the cut surface is not clean and a burr may be generated.

In order to solve this problem, domestic patent registration No. 1037482 (Name of the invention; injection molding machine with automatic side gate cutting device) has a hacore pin operated by the restoring force of a spring, and a side gate connected to the hacoa pin. Disclosed is an injection molding machine having a hacore punch for cutting.

However, according to the above patent, the restoring force of the spring is reduced over time because the state in which the lower core pin, which was pressed by the upper core pin fixed to the stationary side template, presses the spring is repeatedly made. The cutting force of the side gate due to the restoring force of the spring is reduced. As a result, the side gate is not precisely cut according to repeated use, so the cut surface is not clean and a burr is generated, which may cause a problem that an additional finishing process is required.

In addition, according to the above patent, since the lower core punch rises in the state in which the upper and lower cores are open to cut the injection product and the side gate, the lower core punch moves sideways when the injection product and the side gate are not fixed. Since the gate is cut, the side gate may not be cut, and even if the side gate is cut, the side gate is not cut smoothly and is separated from the injection-molded product in a torn form, which may cause burrs.

The present invention was devised in view of the above problems, and an object of the present invention is to provide an injection mold equipped with an automatic side gate cutting device that does not require an additional finishing process by automatically and cleanly cutting a side gate attached to an injection product. .

The object of the present invention as described above is,

an upper core installed in the upper mold and having an upper product groove;

a core installed in the lower mold and provided with a lower product groove forming a cavity together with the upper product groove;

a cutting punch that is provided to be slidable up and down on the lower core and cuts the side gate;

an upper operating pin provided slidably on the upper core and moving up and down in conjunction with the cutting punch;

a cylinder installed on the side of the lower mold; and

a cam unit installed under the cutting punch in the lower mold, and elevating the cutting punch up and down according to the operation of the cylinder;

When the cutting punch rises and cuts the side gate, a residue of the side gate remains between the cutting punch and the upper actuating pin, and when the upper core and the lower core are opened, the upper actuating pin It can be achieved by providing an injection mold having an automatic side gate cutting device, characterized in that it moves down and discharges the residue to the outside.

At this time, the cutting punch may include: a moving block installed on the lower core to be movable up and down; a cutting blade installed on one side of the moving block and moving up and down integrally with the moving block; a spring installed between the lower core and the moving block and pressing the moving block downward; and a stopper installed on the lower core and limiting the movement of the moving block.

In addition, the cam unit may include: a first inclined cam connected to the rod of the cylinder and provided with a first inclined surface on an upper surface thereof; and a second inclined cam installed on the upper side of the first inclined cam to support the lower surface of the cutting punch and including a second inclined surface in sliding contact with the first inclined surface; When horizontally moved by the rod of the cylinder, the second inclined cam may vertically move by the first inclined cam to move the cutting punch up and down.

In addition, the upper operation pin is inserted into the guide hole formed in the upper core, the upper end of the operation pin is supported by urethane fixed to the upper mold, and when the cutting punch rises, the upper operation pin is the cutting punch When the upper core and the lower core are opened, the upper actuating pin may descend by the urethane.

According to the injection mold having the automatic side gate cutting device according to an embodiment of the present invention having the above structure, the upper mold and the lower mold are molded and the injection product and the side gate are fixed by the upper core and the lower core There is an advantage that the side gate is reliably cut from the molded product as the cutting punch operates to cut the molded product and the side gate.

In addition, since the injection mold having the automatic side gate cutting device according to an embodiment of the present invention is configured to raise the cutting punch using a cylinder and an inclined cam, compared to the prior art of cutting the side gate using a spring There is an advantage that the cutting punch can reliably perform the cutting operation even after long-term use.

In addition, since the injection mold having the automatic side gate cutting device according to an embodiment of the present invention has a structure in which the upper operating pin also rises correspondingly when the cutting blade of the cutting punch rises, damage to the cutting blade is prevented when the side gate is cut. It can be prevented, and when the raised upper actuating pin is returned by the elastic member, there is also an advantage that the residue positioned between the upper actuating pin and the cutting blade is automatically discharged.

1 is a cross-sectional view showing an injection mold having a side gate automatic cutting device according to an embodiment of the present invention;
Figure 2 is a partial cross-sectional view showing an enlarged portion of the automatic side gate cutting device of Figure 1;
Figure 3 is a perspective view showing the automatic side gate cutting device installed in the injection mold of Figure 1;
4 is a partial cross-sectional view showing the automatic side gate cutting device of FIG. 3 taken along line I-I;
5 is a partial cross-sectional view showing a state before cutting the side gate in the injection mold having an automatic side gate cutting device according to an embodiment of the present invention;
6 is a partial cross-sectional view showing a state in which a side gate is cut in an injection mold having an automatic side gate cutting device according to an embodiment of the present invention;
7 is a partial cross-sectional view illustrating a state in which an upper core and a lower core of an injection mold having an automatic side gate cutting device according to an embodiment of the present invention are separated.

Hereinafter, embodiments of an injection mold having an automatic side gate cutting device according to the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the embodiments described below are illustratively shown to aid understanding of the present invention, and that the present invention may be implemented with various modifications different from the embodiments described herein. However, in the following description of the present invention, if it is determined that a detailed description of a related known function or component may unnecessarily obscure the gist of the present invention, the detailed description and specific illustration thereof will be omitted. In addition, the accompanying drawings are not drawn to scale in order to help understanding of the invention, but dimensions of some components may be exaggerated.

1 is a cross-sectional view showing an injection mold having an automatic side gate cutting device according to an embodiment of the present invention. Figure 2 is a partial cross-sectional view showing an enlarged portion of the automatic side gate cutting device of Figure 1 is installed. 3 is a perspective view showing the automatic side gate cutting device installed in the injection mold of FIG. 1 , and FIG. 4 is a partial cross-sectional view showing the side gate automatic cutting device of FIG. 3 cut along the line I-I.

Referring to FIG. 1 , an injection mold 1 having an automatic side gate cutting device according to an embodiment of the present invention includes a lower mold unit 2 , an upper mold unit 3 , and an automatic side gate cutting device 100 . ) may be included.

The lower mold unit 2 may include a movable side mounting plate 10 , a spacer block 20 , a lower mold 30 , and a lower core 40 .

The movable side mounting plate 10 is coupled to the movable side of the injection machine (not shown), and is located at the bottom of the lower mold unit 2 , and a spacer block 20 is provided on the upper surface of the movable side mounting plate 10 . are stacked

A space 21 is provided inside the spacer block 20, and the ejector plate 22 is provided to be movable up and down in this space. When the ejector plate 22 rises, an ejector (not shown) may operate to take out an injection product from the cavity 5 .

A lower mold 30 is fixed to the upper surface of the spacer block 20 . The lower mold 30 , the spacer block 20 , and the movable side mounting plate 10 are integrally fixed by bolts (not shown). Accordingly, when the movable side mounting plate 10 is moved by the injection machine, the lower mold 30 is moved.

The lower core 40 is provided on the upper part of the lower mold 30 . The lower core 40 forms a cavity 5 for forming a product, that is, an injection product, together with an upper core 70 to be described later. To this end, a lower product groove 41 corresponding to the lower shape of the product is provided in the lower core 40 .

The upper mold unit 3 is detachably coupled to the lower mold unit 2 described above, and may include a fixed-side mounting plate 50 , an upper mold 60 , and an upper core 70 .

The fixed side mounting plate 50 is coupled to the fixed side of the injection machine (not shown), and is located on the top of the upper mold unit 3 , and the upper mold 60 is laminated on the lower surface of the fixed side mounting plate 50 . do. The upper mold 60 and the fixed-side mounting plate 50 are integrally fixed by bolts (not shown).

An upper core 70 is provided at a lower portion of the upper mold 60 . The upper core 70 forms a cavity 5 together with the lower core 40 described above. To this end, the upper core 70 is provided with an upper product groove 71 corresponding to the upper shape of the product. Accordingly, the upper product groove 71 and the lower product groove 41 form the cavity 5 in a state in which the upper core 70 and the lower core 40 are in close contact with each other, that is, in a mold-closed state.

In addition, the upper mold unit 3 is provided with a sprue 6 for supplying the molten resin, and between the upper core 70 and the lower core 40 , the molten resin supplied from the sprue 6 is placed in a cavity. A runner 7 and a side gate 8 for injection by (5) are provided.

The automatic side gate cutting device 100 is installed in the upper core 70 and the lower core 40, and as shown in FIGS. 3 and 4, the cutting punch 110, the upper operating pin 130, and the cam unit. 150 , and a cylinder 190 .

1 to 4 , the cutting punch 110 is installed to cut the side gate 8 and is slidably installed in the lower core 40 up and down. To this end, the lower core 40 is provided with a hole 43 into which the cutting punch 110 is inserted.

The cutting punch 110 may include a moving block 111 , a cutting blade 112 , and a spring 113 .

The moving block 111 is installed in the lower core 40 to move up and down. Specifically, the moving block 111 is provided to be movable up and down with respect to the runner block 120 on which the runner 7 is formed.

The runner block 120 is formed in a substantially rectangular parallelepiped shape and is fixed to the hole 43 of the lower core 40 . A lower runner groove 121 is formed on the upper surface of the runner block 120 to form the runner 7 together with the upper runner groove provided in the upper core 70 . A block groove 123 in which the moving block 111 is installed is provided at a lower portion of the runner block 120 . The moving block 111 is inserted into the block groove 123 of the runner block 120 and is movable up and down by the cam unit 150 .

The cutting blade 112 is fixed to one side of the moving block 111 and moves up and down integrally with the moving block 111 . The cutting blade 112 is slidably installed on one side of the runner block 120 . The upper end of the cutting blade 112 is formed so as to cut the side gate (8). Accordingly, the upper end of the cutting blade 112 constitutes a part of the inlet portion of the side gate 8 .

The spring 113 is installed between the runner block 120 and the moving block 111 , and applies a downward pressing force to the moving block 111 . Accordingly, the moving block 111 may move downward by the spring 113 . A spring lower fixing groove 114 is provided on the upper surface of the moving block 111 to fix the spring 113 , and a spring upper fixing groove 124 is provided in the block groove 123 of the runner block 120 .

A stopper 115 for limiting the movement of the moving block 111 may be installed in the runner block 120 fixed to the core 40 . An end 116 that interferes with the stopper 115 is provided on one side of the moving block 111 . The stopper 115 installed on the runner block 120 limits the distance the moving block 111 moves downward by the spring 113 .

Therefore, when the cam unit 150 does not apply a force to the moving block 111 , the moving block 111 is a predetermined distance from the bottom surface of the block groove 123 of the runner block 120 by the spring 113 . (G) is spaced apart, the separation distance (G) is limited by the stopper (115). For example, the moving block 111 may be spaced 1 mm apart from the bottom surface of the block groove 123 of the runner block 120 .

The upper operation pin 130 is slidably provided on the upper core 70 , and is installed to move up and down in conjunction with the cutting punch 110 . The upper actuating pin 130 is formed in a shape in which three-stage actuating parts having different diameters are stacked in a straight line. Specifically, the upper operation pin 130 is a lower operation part 131 facing the cutting blade 112 , an intermediate operation part 132 positioned above the lower operation part 131 , and the intermediate operation part 132 . It may include an upper operating part 133 positioned above.

The lower operation part 131 is formed in a rectangular plate shape of a size corresponding to the cutting blade 112 of the cutting punch 110 located at the lower portion, and the middle operation part 132 is the width of the lower operation part 131 . It is formed in a cylindrical shape with a larger diameter. The upper operation part 133 is formed in a cylindrical shape having a larger diameter than the middle operation part 132 .

The upper core 70 is provided with a guide hole 140 into which the upper operation pin 130 is inserted. The guide hole 140 is formed in a form in which three stages of holes having different diameters are stacked. The lower guide hole 141 for guiding the vertical movement of the lower actuating part 131 of the upper actuating pin 130 is formed as a hole having a rectangular cross section corresponding to the cross section of the lower actuating part 131 . Accordingly, the lower operating unit 131 may slide with respect to the lower guide hole 141 . The intermediate guide hole 142 is installed on the upper side of the lower guide hole 141 and guides the intermediate operation part 132 of the upper operation pin 130 to slide. The intermediate guide hole 142 is formed as a circular hole having a diameter corresponding to the intermediate operation part 132 . The upper guide hole 143 is formed on the upper side of the intermediate guide hole 142 , and the upper operation part 133 of the upper operation pin 130 is inserted. The upper guide hole 143 is formed as a circular hole having a larger diameter than the upper operation part 133 . Accordingly, the width of the lower guide hole 141 is the smallest, and the diameter of the upper guide hole 143 provided at the top is the largest. The diameter of the intermediate guide hole 142 positioned between the lower guide hole 141 and the upper guide hole 143 is larger than the width of the lower guide hole 141 and smaller than the diameter of the upper guide hole 143 .

An elastic member 138 is installed on the upper side of the upper operation pin 130 . Specifically, the elastic member 138 is installed to be in contact with the upper surface of the upper operating portion 133 of the upper operating pin (130). To this end, the elastic member 138 may be fixed to the upper mold 70 . The elastic member 138 is compressed when the upper operation pin 130 rises by the cutting punch 110, and when the cutting punch 110 descends, an elastic force can be applied so that the upper operation pin 130 moves downward. is formed The elastic member 138 may be formed in a cylindrical shape having a smaller diameter than that of the upper operation part 133 of the upper operation pin 130 . For example, the elastic member 130 may be formed of urethane having a certain elasticity.

The cam unit 150 is installed in the lower part of the cutting punch 110 , and operates by the cylinder 190 to raise and lower the cutting punch 110 up and down. A cam unit installation space 45 is provided in the lower mold 40 for installation of the cam unit 150 .

The cam unit 150 is connected to the rod 192 of the cylinder 190, and is installed on the upper side of the first inclined cam 160 and the first inclined cam 160 having the first inclined surface 161 on the upper surface and is cut. It supports the lower surface of the punch 110 and may include a second inclined cam 170 provided with a second inclined surface 172 in sliding contact with the first inclined surface 161 .

Specifically, the first inclined cam 160 is formed in a substantially rectangular parallelepiped shape that is slidably installed with respect to a pair of guide rails 151 installed at the lower end of the lower mold 30 , and the first inclined cam 160 . A first inclined surface 161 inclined at a predetermined angle is provided on the upper surface of the . An inclined rail groove 162 into which the inclined rail 175 protruding from the second inclined cam 170 is inserted may be provided on both inner sides of the first inclined surface 161 .
In this case, the inclined rail 175 may have a lower cross-sectional area wider than an upper cross-sectional area and protrude from both sides. These inclined rails 175 may be coupled to be in sliding contact along the inclined rail grooves 162 .

In addition, a pair of guide blades 166 supported by a pair of guide rails 151 may be provided on both side surfaces of the first inclined cam 160 . In addition, a coupling groove 163 coupled to the tip of the extension rod 195 connected to the cylinder 190 is provided on one side facing the cylinder 190 . Accordingly, according to the operation of the rod 192 of the cylinder 190 , the first inclined cam 160 may horizontally move in a straight line with respect to the lower mold 30 .

The second inclined cam 170 is installed on the upper side of the first inclined cam 160 , and is provided to raise the cutting punch 110 according to the operation of the first inclined cam 160 . The second inclined cam 170 includes a cam block 171 in contact with the first inclined surface 161 of the first inclined cam 160 and a vertical rod 173 vertically installed on the upper portion of the cam block 171 . can do.

The cam block 171 is formed in a substantially rectangular parallelepiped shape, and the lower surface of the first inclined cam 160 in contact with the first inclined surface 161 has a second inclined surface 172 having an inclination corresponding to the first inclined surface 161 . this is provided Accordingly, the cam block 171 may slide with respect to the first inclined cam 160 . The vertical rod 173 is formed in a cylindrical shape, and the lower end is fixed to the fixing hole 174 provided at the upper portion of the cam block 171 , and the upper end contacts and supports the lower surface of the cutting punch 110 . Since the vertical rod 173 is inserted into the bush 176 fixed to the lower mold 30 , the vertical movement of the vertical rod 173 can be smoothly guided by the bush 176 . Accordingly, when the cam block 171 rises by the first inclined cam 160 , the vertical bar 173 also rises by the cam block 171 .

The cylinder 190 is installed on one side of the cutting punch 110 to operate the cam unit 150 . The cylinder 190 may be installed outside the lower mold 40 . A pneumatic cylinder may be used as the cylinder 190 . The cylinder 190 includes a cylinder body 191 and a rod 192 protruding and protruding relative to the cylinder body 191 . An extension rod 195 may be coupled to one end of the rod 192 . One end of the extension rod 195 is fixed to one end of the rod 192 , and the other end of the extension rod 195 is fixed to the coupling groove 163 of the first inclined cam 160 . As another example, when the distance between the first inclination cam 160 and the cylinder 190 is close, the tip of the cylinder rod 192 may be directly connected to the first inclination cam 160 .

Accordingly, when the rod 192 of the cylinder 190 moves horizontally, the extension rod 195 moves horizontally with the rod 192 integrally. When the extension rod 195 moves horizontally, the first inclined cam 160 moves horizontally. When the first inclined cam 160 moves horizontally, the inclined rail groove 162 of the first inclined surface 161 of the first inclined cam 160 is formed on the second inclined surface 172 of the second inclined cam 170 . Since it slides with respect to the inclined rail 175, the second inclined cam 170 moves vertically. When the second inclined cam 170 moves vertically, the vertical rod 173 moves vertically to vertically move the cutting punch 110 . That is, the cam unit 150 converts the horizontal motion of the cylinder 190 into a vertical motion to elevate the cutting punch 110 up and down.

Hereinafter, the operation of the injection mold having the automatic side gate cutting device according to an embodiment of the present invention having the above structure will be described in detail with reference to FIGS. 5 to 7 .

5 is a partial cross-sectional view showing a state before cutting the side gate in the injection mold having the automatic side gate cutting device according to an embodiment of the present invention. 6 is a partial cross-sectional view illustrating a state in which a side gate is cut in an injection mold having an automatic side gate cutting device according to an embodiment of the present invention. 7 is a partial cross-sectional view illustrating a state in which an upper core and a lower core of an injection mold having an automatic side gate cutting device according to an embodiment of the present invention are separated.

5 shows the upper mold 60 and the lower mold 30 are coupled, that is, mold-closed, and in a state where the upper core 70 and the lower core 40 are in contact with each other, the sprue 6, the runner 7, and a state in which the cavity 5 is filled with resin through the side gate 8 . At this time, the resin filled in the cavity 5, that is, the injection product 200, is connected to the resin filled in the side gate 8 (hereinafter referred to as the side gate 201).

After the resin 200 filled in the cavity 5 is solidified, the side gate automatic cutting device 100 is operated to cut the side gate 201 from the injection product 200 .

Specifically, by operating the cylinder 190, so that the cylinder rod 192 protrudes from the cylinder body (191). Then, the extension rod 195 connected to the cylinder rod 192 moves to one side, in the case of FIG. 4, to the left (in the case of FIG. 5, in the direction entering the ground), and the first inclined cam 160 connected to the extension rod 195 ) moves to the left.

When the first inclined cam 160 moves to the left, the second inclined cam 170 moves upward by the first inclined surface 161 of the first inclined cam 160 . When the second inclined cam 170 moves upward, the vertical bar 173 rises to raise the moving block 111 of the cutting punch 110 . When the moving block 111 rises, as shown in FIG. 6 , the cutting blade 112 installed integrally with the moving block 111 rises to cut the side gate 201 . When the cutting blade 112 rises, the upper operation pin 130 inserted into the guide hole 140 rises upward by the cutting blade 112, and the tip of the cutting blade 112 is a lower guide hole 141. located in At this time, the portion (hereinafter, the residue) 203 of the side gate 201 corresponding to the thickness of the cutting blade 112 is cut by the cutting blade 112 and the upper actuating pin inside the lower guide hole 141 It is positioned between the lower end of the 130 and the tip of the cutting blade 112 . On the other hand, when the upper operation pin 130 rises by the cutting blade 112, the elastic member 138, that is, the urethane is in a compressed state.

Then, the lower mold unit 2 is moved to perform mold opening. Then, the upper core 70 and the lower core 40 are spaced apart, and an ejector (not shown) operates to eject the injection product 200 from the cavity 5 . At this time, when the lower core 40 is separated, the force applied to the upper operation pin 130 by the cutting blade 112 is removed, so that the urethane 138 returns to its original state. Then, the residue 203 located in the lower guide hole 141 is discharged to the outside by the upper operation pin 130 .

As described above, according to the injection mold 1 having the automatic side gate cutting device according to an embodiment of the present invention, the mold-closed state, that is, the injection product 200 and the side gate 201 are the upper core 70 and the lower core. Since the cutting punch 110 operates in a state fixed by 40 to cut the injection-molded product 200 and the side gate 203 , there is an advantage that the side gate 203 is reliably cut from the injection-molded product 200 .

In addition, since the injection mold 1 having the automatic side gate cutting device according to an embodiment of the present invention has a structure in which the cutting punch 110 is raised using the cylinder 190 and the inclined cam 150, the spring There is an advantage that the cutting operation of the cutting punch 110 is reliably maintained even when used for a long period of time compared to the case of use.

In addition, since the injection mold 1 having the automatic side gate cutting device according to an embodiment of the present invention has a structure in which the cutting blade 112 of the cutting punch 110 rises, the upper actuating pin 130 also rises. , there is an advantage that it is possible to prevent damage to the cutting blade 112 when the side gate 201 is cut. In addition, when the raised upper operation pin 130 is returned by the elastic member 138, there is also an advantage that the residue 203 is automatically discharged.

In the above, the present invention has been described by way of example. The terms used herein are for the purpose of description and should not be construed in a limiting sense. Various modifications and variations of the present invention can be made according to the above contents. Accordingly, unless otherwise stated, the present invention may be freely practiced within the scope of the claims.

One; Injection mold with automatic side gate cutting device
2; lower mold unit 3; upper mold unit
5; cavity 6; sprue
7; Runner 8; side gate
10; Movable side mounting plate 20; spacer block
30; lower mold 40; hardcore
50; Fixed side mounting plate 60; upper mold
70; Sangcore 100; Side gate automatic cutting device
110; cutting punch 111; moving block
112; cutting blade 113; spring
120; runner block 130; upper working pin
138; elastic member 140; guide hole
150; cam unit 160; 1st incline cam
161; first slope 170; 2nd incline cam
171; cam block 172; 2nd slope
173; vertical bar 176; bush
190; cylinder 192; road
195; extension bar 200; injection molding
201; side gate 203; residue

Claims (5)

an upper core installed in the upper mold and having an upper product groove;
a core installed in the lower mold and provided with a lower product groove forming a cavity together with the upper product groove;
a cutting punch which is provided to be slidable up and down on the lower core and cuts the side gate;
an upper operating pin provided slidably on the upper core and moving up and down in conjunction with the cutting punch;
a cylinder installed on the side of the lower mold; and
It includes; a cam unit installed under the cutting punch in the lower mold and lifting the cutting punch up and down according to the operation of the cylinder;
When the cutting punch rises to cut the side gate, a residue of the side gate remains between the cutting punch and the upper actuating pin, and when the upper core and the lower core are opened, the upper actuating pin moving down to discharge the residue to the outside,
The cam unit is
It is connected to the rod of the cylinder, a first inclined surface is provided on the upper surface, inclined rail grooves are provided on both inner sides of the first inclined surface, and is slidably supported by a pair of guide rails installed at the lower end of the lower mold. a first inclination cam provided with a pair of guide vanes on both sides to enable it;
A second inclined surface installed on the upper side of the first inclined cam to support the lower surface of the cutting punch, and a second inclined surface that is in sliding contact with the first inclined surface, and a second inclined surface that is inserted into the inclined rail groove to be in sliding contact with the inclined rail groove. A second inclined cam having a lower cross-sectional area wider than the upper cross-sectional area so as to include inclined rails protruding from both sides;
When the first inclined cam is horizontally moved by the rod of the cylinder, the second inclined cam is vertically moved by the first inclined cam to move the cutting punch up and down,
The upper operating pin is inserted into the guide hole formed in the upper core, and the upper end of the upper operating pin is supported by urethane fixed to the upper mold, and when the cutting punch rises, the upper operating pin is formed by the cutting punch. It rises, and when the upper core and the lower core are opened, the upper operating pin is lowered by the urethane,
The cutting punch,
A moving block installed in the lower core to be movable up and down; and a cutting blade installed at one side of the moving block and moving up and down integrally with the moving block; and installed between the lower core and the moving block. Including; a spring for pressing the moving block down;
An injection mold having an automatic side gate cutting device including a stopper for limiting the movement of the moving block at the lower core. delete delete delete delete

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