KR20220167527A - injection method using 1mensuration 2injection - Google Patents

Abstract

The present invention relates to an injection method using one-measurement and two-injections which is arranged to injection-mold a heterogeneous part (first injection product) with a larger volume among heterogeneous parts first, and to injection-mold a heterogeneous part (second injection product) with a smaller volume among the heterogeneous parts next, according to the volumes of the heterogeneous parts. Poor quality that occurs during injection molding can be minimized by sequentially injecting a molten resin of a one-measurement process into each cavity.

Description

Injection method using 1 meter 2 injection {injection method using 1 mensuration 2 injection}

The present invention relates to an injection method using 1 meter 2 injection, in which, according to the volume of the heterogeneous parts, a heterogeneous part (first injection product) having a large volume among the heterogeneous parts is first injection molded, and then a small volume among the heterogeneous parts is injection molded. An injection method using 1-meter 2-injection, which is arranged to injection-mould a different type of part (second injection product) and can minimize quality defects that occur during injection molding by sequentially injecting 1-meter of molten resin into each cavity will be.

In general, injection molding is by putting synthetic resin in the form of powder or pellets into an injection cylinder equipped with a heating device to melt it, press it into the cavity of an injection mold using a transfer screw installed inside the injection cylinder, and then cool and harden it. It is used to mold desired products, especially for mass production of products made of synthetic resin.

Injection molds used in such injection molding are classified into single cavity molds, multi-cavity molds, and family molds according to the number of cavities. is characterized in that a plurality of cavities having different volumes and shapes are provided in a single mold, so that a plurality of plastic parts necessary for assembling a product can be simultaneously produced in a single injection molding operation.

In general, in order to injection mold a plurality of plastic parts required to assemble a product, it is necessary to manufacture molds suitable for each part. As an injection molding machine is required for each mold for production, there is a problem in that the cost and maintenance cost invested in the injection molding machine increase.

In order to solve the above problems, an injection mold device for simultaneously injecting a plurality of parts having correlation with each other is disclosed in Korean Patent Publication No. 10-2017-0089818.

A conventional injection mold apparatus is configured such that a plurality of cavities are formed in a fixed mold part and a movable mold part, and a molten resin is simultaneously injected into the plurality of cavities by an injection molding machine.

In this way, in the case of simultaneous injection molding of release products having different shapes, it is difficult to simultaneously provide appropriate injection molding conditions for each release product, and there is a problem in that appearance or functional defects of each release product occur.

In addition, in order to solve this problem, if an injection molding machine is installed separately for each release product, a new injection molding machine must be additionally installed, which further increases the investment cost and additionally secures space as the injection molding machine is additionally installed. , there is a problem that the overall layout of the factory must be enlarged.

Korean Patent Publication No. 10-2017-0089818

Therefore, an object of the present invention is to solve the problems of the prior art as described above, and according to the volume of the heterogeneous part, a large heterogeneous part (first injection molding product) is injection molded first, and then It is arranged to injection mold a small heterogeneous part (second injection part) among heterogeneous parts, and 1 meter 2 injection can minimize quality defects that occur during injection molding by sequentially injecting 1 meter of molten resin into each cavity. It is to provide an injection method using.

According to the features of the present invention for achieving the above object, the injection method using 1 meter 2 injection according to the present invention is filled with resin in the cylinder, and the agent formed inside the mold by heating operation A first metering step in which one meter of melt resin sequentially filled into the first cavity and the second cavity is created inside the injection molding machine, and one meter of melt resin of the injection molding machine is placed inside the first cavity among a plurality of cavities. A first injection step of supplying a molten resin having a capacity corresponding to that of the first cavity to the first cavity, and a second cavity of a molten resin of one meter of an injection molding machine placed inside the second cavity among a plurality of cavities. A second injection step of supplying a corresponding amount of molten resin to the second cavity, and a take-out step of discharging the injected products of the plurality of cavities to the outside of the mold by opening the upper and lower molds of the mold.

The molten resin filled in the first cavity has a larger capacity than the molten resin filled in the second cavity.

Between the first injection step and the second injection step,

A first cavity cooling step of cooling the molten resin filled in the first cavity is further performed.

In the first injection step, a closing operation of the second valve gate of the second hot runner connected to the second cavity is performed by a first injection control signal, and the first cavity of the 1-metered molten resin of the injection molding machine The molten resin corresponding to is filled.

In the second injection step, a closing operation of the first valve gate of the first hot runner connected to the first cavity is performed in response to a second injection control signal, and a second injection control signal of the second hot runner connected to the second cavity is performed. The opening operation of the 2-valve gate is performed so that the molten resin corresponding to the second cavity among the 1-metered molten resin of the injection molding machine is filled into the second cavity.

Between the second injection step and the ejection step, a simultaneous cooling step of simultaneously cooling the molten resin filled in the first cavity and the second cavity is further performed.

The injection method using 1 meter 2 injection according to the present invention has the following effects.

In the present invention, the injection method using 1 meter 2 injection is an injection molding method for injection molding heterogeneous parts, in particular, according to the volume of heterogeneous parts, a heterogeneous part (first injection product) having a large volume is injected first. molding, and then arranged to injection-mold a heterogeneous part (second injection molding product) having a small volume among heterogeneous parts.

In the case of a relatively large heterogeneous part (first injection product), cooling time is required as the molten resin is first filled in the first cavity of a relatively large heterogeneous part (first injection product). It has the advantage of improving efficiency.

In addition, the injection method using 1 meter 2 injection of the present invention selectively opens and closes the first gate and the second gate, so that the pressure applied to each cavity can be independently disposed, and the filling of the molten resin in each cavity is As each is performed separately, there is an effect of minimizing quality defects due to differences in the filling time of the molten resin and the environmental difference in the filling of the molten resin.

1 is a cross-sectional view showing the configuration of a preferred embodiment of an injection mold according to the present invention.
Figure 2 is an operation diagram showing the configuration of a preferred embodiment of the injection molding machine according to the present invention.
Figure 3 is a step-by-step mold operation diagram showing the step-by-step operation state of the injection mold according to the present invention.
4 is a flow chart showing the process of injection molding by an injection molding machine and an injection mold according to the present invention.

Hereinafter, a preferred embodiment of the injection method using 1 meter 2 injection according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing the configuration of a preferred embodiment of an injection mold according to the present invention, FIG. 2 is an operating diagram showing the configuration of a preferred embodiment of an injection molding machine according to the present invention, and FIG. A step-by-step mold operation diagram showing the step-by-step operation state of the injection mold is shown, and FIG. 4 is a flow chart showing the process of injection molding by the injection molding machine and the injection mold according to the present invention.

1 and 4, the injection method using 1 meter 2 injection according to the present invention, the inside of the cylinder is filled with resin, the first cavity 30 and the first cavity 30 formed inside the mold by a heating operation A first metering step (S100) in which one meter of molten resin sequentially filled into the inside of the second cavity 32 is generated inside the injection molding machine, and the inside of the first cavity 30 among the plurality of cavities A first injection step (S120) of supplying a molten resin having a capacity corresponding to that of the first cavity 30 among 1 meter of molten resin to the first cavity 30, and a second cavity 32 of a plurality of cavities. ) A second injection step (S140) of supplying a molten resin of a capacity corresponding to the second cavity 32 among 1 meter of molten resin of the injection molding machine to the second cavity 32, and the upper mold of the mold and a take-out step (S160) of discharging the injection products of the plurality of cavities 30 and 32 to the outside of the mold by opening the lower mold.

First, with reference to FIGS. 1 and 2, an injection mold and an injection molding machine will be described in detail.

The injection mold 10 is largely composed of an upper mold 12 and a lower mold 14. The upper mold 12 includes a runner 16, a first hot runner 18, a second hot runner 20, a first cavity 30, a second cavity 32, and the like.

The runner 16 is a general runner, and a detailed description thereof will be omitted. The runner 16 is a molten resin supply passage formed inside the upper die 12 and is connected to the first cavity 30 and the second cavity 32, respectively.

A first hot runner 18 and a second hot runner 20 are installed inside the upper die 12 . The first and second hot runners 18 and 20 are general hot runners, and detailed descriptions thereof will be omitted. The first and second hot runners 18 and 20 are respectively connected to a first cavity 30 and a second cavity 32 to be described later, respectively, and molten material is supplied to the first and second cavities 30 and 32 to be described later. It serves to heat the resin to a certain temperature and guide it toward the first cavity 30 or the second cavity 32 .

That is, a heater (not shown) is installed inside the first hot runner 18 and the second hot runner 20 to heat the molten resin supplied through the runner 16 to a constant temperature. It serves to prevent solidification that may occur in the process of flowing the molten resin through the runner 16 toward the first cavity 30 and the second cavity 32 to be described later.

In addition, a first valve gate 22 and a second valve gate 24 are installed inside the first hot runner 18 and the second hot runner 20, respectively. The first and second valve gates 22 and 24 are general valve gates, and a detailed description thereof will be omitted. The first and second valve gates 22 and 24 largely consist of a piston (not shown) and a valve pin (not shown), and are installed inside the first and second hot runners 18 and 20, which will be described later. It serves to selectively open and close the first and second gates 26 and 28 respectively connected to the first cavity 30 and the second cavity 32 .

A first cavity 30 and a second cavity 32 are formed inside the upper mold 12, respectively. The first and second cavities 30 and 32 are general cavities, and detailed descriptions thereof are omitted. The inside of the first and second cavities 30 and 32 is filled with molten resin supplied through the first gate 26 and the second gate 28, and is a portion where an injection product is formed.

In addition, the first core 34 and the second core 36 of the lower mold 14 are disposed inside the first cavity 30 and the second cavity 32, so that the injection products A and B are formed. The shape of the inner surface of can be formed.

That is, as the first and second cores 34 and 36 are respectively coupled to the inside of the first and second cavities 30 and 32, the molten resin is filled to produce the first and second injection-molded products A and B. A mold is formed.

Hereinafter, with reference to FIG. 2, the injection molding machine 40 will be described in detail. The injection molding machine 40 largely consists of a cylinder 42 and a screw 44. The cylinder 42 is a general injection cylinder, and a detailed description thereof will be omitted.

Resin is supplied to the inside of the cylinder 42 through a hopper (not shown), and the resin is heated through a heating operation to form a molten resin.

A screw 44 is installed inside the cylinder 42 . The screw 44 is a general screw and a detailed description thereof will be omitted. The screw 44 is installed inside the cylinder 42 to be movable forward and backward, and serves to push the molten resin generated inside the cylinder 42 to the inside of the mold side with a constant pressure.

Hereinafter, with reference to FIGS. 1 to 4, an injection method using 1 meter 2 injection according to the present invention will be described in detail.

First, 1 measurement refers to the capacity of molten resin required to make the first and second injection-molded products (A, B) manufactured through 1 cycle.

For example, as shown in FIG. 2, when the melt resin required to produce the first injection-molded product (A) is 60 mm and the melt resin required to produce the second injection-molded product (B) is 30 mm, it is necessary for packing. One measurement of about 100 mm can be made considering the capacity of one melted resin. (The unit of mm indicates the moving distance of the screw.)

As described above, the inside of the cylinder 42 is filled with resin, and the inside of the first cavity 30 and the second cavity 32 formed inside the mold by the heating operation are sequentially filled in one meter of A first metering step (S100) in which molten resin is produced inside the injection molding machine is performed.

When the first metering step (S100) is completed, a mold closing step (S110) is performed in which the upper mold 12 and the lower mold 14 are combined to form the first and second injection products A and B. .

When the mold closing step (S110) is completed, a first injection step is performed. In the first injection step (S120), the second valve gate 24 of the second hot runner 20 connected to the second cavity 32 is closed by the first injection control signal 46. , The molten resin corresponding to the first cavity 30 among the molten resin measured by 1 meter of the injection molding machine 40 is filled into the first cavity 30 .

In the state where the second gate 28 of the second cavity 32 is closed by the first injection step (S120), the molten resin filling operation of the first cavity 30 is performed.

When the first injection step (S120) is completed, a first cavity cooling step (S130) is performed. The first cavity cooling step (S130) is a general mold cooling method in which cooling water flows around the first cavity 30, and a detailed description thereof will be omitted. A cooling operation of the molten resin filled in the first cavity 30 may be performed by the first cavity cooling step (S130).

In addition, the second injection step (S140) is performed simultaneously with the first cavity cooling step (S130). In the second injection step (S140), the closing operation of the first valve gate 22 of the first hot runner 18 connected to the first cavity 30 is performed by the second injection control signal 48. , the opening operation of the second valve gate 22 of the second hot runner 20 connected to the second cavity 32 is performed, and the second cavity 32 of the 1-metered molten resin of the injection molding machine 40 The molten resin corresponding to is filled into the second cavity 32 .

When the second injection step (S140) is completed, a simultaneous cooling step (S150) of cooling the molten resin filled in the first cavity 30 and the second cavity 32 is performed. The simultaneous cooling step (S150) is a general mold cooling method in which cooling water flows around the first cavity 30 and the second cavity 32, and a detailed description thereof will be omitted. The cooling operation of the molten resin filled in the first cavity 30 and the second cavity 32 may be performed by the simultaneous cooling step (S150).

When the simultaneous cooling step (S150) is completed, a take-out step for taking out the first injection-molded product (A) and the second injection-molded product (B) molded inside the first cavity 30 and the second cavity 32 (S160) is carried out.

In the taking out step (S160), the first injection molding product A molded into the first cavity 30 and the second cavity 32 through a mold opening operation of separating the upper mold 12 and the lower mold mold. and a take-out operation of discharging the second injection-molded product B to the outside.

This first metering step (S100) → first injection step (S120) → first cavity cooling step (S130) → second injection step (S140) → simultaneous cooling step (S150) → take-out step (S160) is one metering step As one cycle of the injection method using two injections, injection molding may be performed by repeating this process every cycle.

The injection method using 1 meter 2 injection of the present invention as described above is an injection molding method for injection molding a heterogeneous part, in particular, a heterogeneous part (first injection product) having a large volume among heterogeneous parts according to the volume of the heterogeneous part. First, injection molding is performed, and then, among the heterogeneous parts, a heterogeneous part having a small volume (second injection molding) is arranged to be injection molded.

This is because, in the case of a relatively large heterogeneous part (first injection product), a long cooling time is required, so that the molten resin is first filled in the first cavity 30 of the relatively large heterogeneous part (first injection product). As a result, the cooling efficiency can be improved.

In addition, when the pressure of the molten resin filled in the first cavity 30 and the second cavity 32 is applied differently, the volume is higher than the injection pressure applied to the generally small heterogeneous part (second injection product) The injection pressure applied to the large dissimilar part (first injection product) is designed to be large.

Therefore, since the quality defect of the second injection product (B) may be caused by the strong injection pressure of the large-volume heterogeneous part (the first injection product), the second cavity in which the second injection product (B) is molded It is preferable that the first cavity 30 in which the first injection-molded product (A) is molded is first molded rather than (32).

In addition, the injection method using 1 meter 2 injection of the present invention selectively opens and closes the first gate 26 and the second gate 28, so that the pressure applied to each cavity can be independently disposed, and each cavity As the filling of the molten resin is performed separately, it is possible to minimize quality defects due to differences in the filling time of the molten resin and the environment in which the molten resin is filled.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible for those skilled in the art within the above technical scope.

10. Injection mold 12. Upper mold
14. Lower mold 16. Runner
18. First hot runner 20. Second hot runner
30. First cavity 32. Second cavity
40. Injection molding machine 42. Cylinder
44. Screw

Claims (6)

The first metering step in which resin is filled in the cylinder, and 1 meter of molten resin sequentially filled in the first and second cavities formed inside the mold by heating operation is created inside the injection molding machine. Wow;
a first injection step of supplying to the first cavity a molten resin having a volume corresponding to that of the first cavity among 1 meter of molten resin of an injection molding machine in the first cavity among a plurality of cavities;
a second injection step of supplying a molten resin having a volume corresponding to that of the second cavity among 1 meter of molten resin of an injection molding machine to the second cavity among the plurality of cavities;
An injection method using one-quantity two-injection including a; ejection step of opening the upper mold and the lower mold of the mold to discharge the injection products of the plurality of cavities to the outside of the mold. According to claim 1, wherein the molten resin filled in the first cavity has a larger capacity than the molten resin filled in the second cavity; injection using 1 meter 2 injection, characterized in that method. The method of claim 2, wherein between the first injection step and the second injection step,
A first cavity cooling step of cooling the molten resin filled in the first cavity is further performed; an injection method using 1 meter 2 injection, characterized in that. The method of claim 3, wherein the first injection step,
The closing operation of the second valve gate of the second hot runner connected to the second cavity is performed by the first injection control signal, and the molten resin corresponding to the first cavity among the 1-metered molten resin of the injection molding machine is filled. Injection method using 1 meter 2 injection characterized by; The method of claim 4, wherein the second injection step,
A closing operation of the first valve gate of the first hot runner connected to the first cavity is performed by a second injection control signal, and an opening operation of the second valve gate of the second hot runner connected to the second cavity An injection method using 1-meter 2-injection, characterized in that the molten resin corresponding to the second cavity among the 1-meter molten resin of the injection molding machine is filled in the second cavity. The method of claim 5, between the second injection step and the take-out step,
A simultaneous cooling step of simultaneously cooling the molten resin filled in the first cavity and the second cavity is further performed; an injection method using 1 meter 2 injection, characterized in that.

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