KR20200054505A - Method for molding injection molding machine - Google Patents

Abstract

The present invention relates to a molding method for an injection molding machine, capable of shortening a molding time and reducing a manufacturing cost. According to the present invention, the molding method for the injection molding machine includes: opening a mold; primarily closing the mold; performing primary injection; measuring/performing primary and secondary injection; measuring/performing primary and secondary injection; primarily cooling/measuring; primarily opening the mold; linearly moving a movable side shaping plate; proceeding secondary closing of the mold; stopping during the secondary closing of the mold; waiting while stopping the secondary closing of the mold; completing the secondary closing of the mold; performing secondary injection; secondarily cooling; secondarily opening the mold; withdrawing a product; and returning by a linear movement.

Description

Molding method of injection molding machine {METHOD FOR MOLDING INJECTION MOLDING MACHINE}

The present invention relates to a molding method of an injection molding machine, and more specifically, when the product is injection molded, two molded semi-finished products are collected in one injection molding machine without external bonding or surface treatment by separate facilities. It relates to a molding method of an injection molding machine that can be completed.

In general, the mold closing operation of the injection molding machine can withstand the pressure applied to the cross-sectional area of the product when the mold is molded during injection molding and the molten plastic material, especially thermoplastic resin, is injected at a high speed into the injection mold by applying considerable pressure. It plays a role of opening the mold to take out the product after molding and the mold clamping force.

The injection molding machine is largely composed of an injection table with an injection cylinder and a molded part on which an injection mold is mounted. The injection table includes an injection cylinder that heat-melts the thermoplastic resin to a high temperature to make it flow and injects it into the injection mold at a high speed by applying a considerable pressure, and a control mechanism for controlling the operation.

In addition, the mold part has a fixed mold plate on which a fixed side mold is installed, and a movable mold plate on which a movable side mold is installed in an opposing longitudinal direction, and includes a control mechanism for controlling mold opening and closing.

And the injection mold is divided into a fixed side mold and a movable side mold. Usually, the fixed side mold is installed on a fixed plate of the mold part of the injection molding machine, and the movable side mold is installed on a movable mold plate of the mold part.

However, the conventional injection molding machine is a mold opening and closing operation, according to the mold of the product to be manufactured, the process of the mold closing operation is controlled according to the distance divided stepwise from the mold opening to the mold closing, so that only the speed and pressure are controlled and closed without stopping.

That is, it should be stopped when a separate operation must be performed for a desired time between each distance before the mold closing of the injection molding machine, but the conventional injection molding machine does not have a stop function and stops for a certain period of time without injection molding from the injection stand even after closing. There is a problem that it is impossible to increase the completeness in the molding process of the product because there is no function to be molded.

Republic of Korea Patent Publication No. 10-2017-0063164 (June 08, 2017)

The technical problem of the present invention is that the two semi-finished products formed by the primary process in the injection molding machine as a secondary process by controlling the mold closing operation and movement operation of the mold without bonding or surface treatment by separate facilities. It is to provide a molding method of an injection molding machine that can be assembled and completed.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

The above technical problem is, after injection molding with a thermoplastic resin in one or two or more concave cavities on the fixed side and the movable side of the injection mold mounted on the injection molding machine, the two molded on the fixed side and the movable side in the mold. In order to fuse two products, either side of the mold moves linearly facing each other and heats and melts the surface between the two products to fuse them into one by mold closing, or after moving, they are combined with each other to make a second injection into the gap between the two products. In the molding method of the injection molding machine for making a finished product by fusion to each other,

Include or omit the mold opening (first process), first mold closing (second process), first injection (3-1 process), metering / 1, second injection (3-2 process) of the mold, or Weighing / 1st, 2nd injection (3rd-2nd process), 1st cooling / weighing (4th process), 1st mold opening (5th process), linear movement of movable side plate (6th process), 2nd mold closing Progress (7th process), stop or stop during the 2nd mold closing (8th process), 2nd mold stop waiting (IN / OUT in the external device mold) (9th process) is included or omitted, or 2nd Completion of mold closing (10th process), 2nd injection (11th process) included or omitted, 2nd cooling (12th process), 2nd mold opening (13th process), product withdrawal (14th process), linear movement It is made by one cycle of return (15th process), and it is achieved by a molding method of an injection molding machine characterized in that it is repeated from mold opening (first process) to linear movement return (15th process).

The stop (8th process) during the mold closing is controlled by the pressure and speed of the stages from the starting position of the 2nd mold closing to the 2nd mold closing position, and the moving plate is stopped at the desired position before the mold closing. It is characterized in that, after the second mold closing stop (the ninth process), the second mold closing is completed by moving back to the second mold closing (the tenth process).

The second injection (the eleventh process) may be selectively omitted, the second injection (the eleventh process) proceeds according to the input value of Yes / No or A / B of the operation panel of the injection molding machine, or When the injection is omitted, it is characterized in that the second cooling (12th process-time is set) immediately proceeds.

The weighing / 1st and 2nd injection (step 3-2) is the first of the two cavities when the weight of the product coming from the two cavities of the injection molding machine is greater than the weight that can be molded at once in the injection molding machine. In the first injection (3-1 process), the gate of one cavity is closed and the rest of the cavity is opened and molded first, and the gate of one cavity that is blocked after the weighing of the first and second injections (3-2 process) It is characterized by opening and molding.

According to the present invention, the two semi-finished products molded by the primary process in the injection molding machine are collected as a secondary process by controlling the mold closing operation and movement operation, etc. without bonding or surface treatment by separate facilities. By completing, there is a useful effect that can shorten the molding time by reducing the number of processes of the product and lower the manufacturing cost to supply the market at a low price.

1 is a plan view schematically showing an injection molding machine according to the present invention.
2 is a front view schematically showing an injection molding machine according to the present invention.
Figure 3 is a cross-sectional view for explaining the mold opening process of the injection molding machine according to the present invention.
4 is a cross-sectional view for explaining the primary mold closing, primary injection, metering / 1, secondary injection and primary cooling / metering processes of the injection molding machine according to the present invention.
5 is a cross-sectional view for explaining the primary mold opening process of the injection molding machine according to the present invention.
Figure 6 is a cross-sectional view for explaining the linear movement process of the movable side of the injection molding machine according to the present invention.
7 is a cross-sectional view for explaining the secondary mold closing process of the injection molding machine according to the present invention.
8 is a cross-sectional view for explaining a stop process during the secondary mold closing of the injection molding machine according to the present invention.
9 is a cross-sectional view for explaining the secondary mold closing stop process of the injection molding machine according to the present invention.
10 is a cross-sectional view for explaining the secondary mold closing, secondary injection, and secondary cooling processes of the injection molding machine according to the present invention.
11 is a cross-sectional view for explaining the secondary mold opening and product taking out process of the injection molding machine according to the present invention.
12 is a cross-sectional view for explaining a process of returning a linear movement of a movable side shape plate of an injection molding machine according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention.

1 is a plan view schematically showing an injection molding machine according to the present invention, and FIG. 2 is a front view schematically showing an injection molding machine according to the present invention. 1 and 2, the injection molding machine 1 is provided with an injection stand 3 including an injection cylinder in the injection part body 2 to the right in the longitudinal direction, and the mold clamping plate 6 on the opposite side The mold-side movable plate 7 is provided with a fixed side plate 11 and a movable side plate 12 of the mold, and the mold-operated plate 7 is molded with mold opening and closing along the template guide bar 5 It is included in the sub-body (4).

The operation panel (8) controls the vertical heating, metering, and injection in the injection cylinder (3) before and after, and the mold movable plate (7) of the mold body (4) is the mold guide tire (5). Controls the operation in all injection molding machines, such as mold opening / closing operation in the longitudinal direction and withdrawal device for taking out products in the mold in the longitudinal direction. In addition to this, the operation panel 8 may control various pneumatic devices attached to the mold and operated as needed during the injection process.

In the above state, the one cycle of the general injection molding operation consists of mold closing, injection, cooling / weighing, mold opening, and taking out processes in the mold opening state, and these original cycles are repeated from the mold opening process to the taking out process again. .

3 is a cross-sectional view for explaining the mold opening process of the injection molding machine according to the present invention.

As shown in FIG. 3, the fixed side shape plate 11 and the fixed side attachment plate 13 of the mold in the longitudinal direction of the injection molding machine 1 are installed on the mold clamping plate 6 and the movable side shape plate of the mold (12) and the movable side mounting plate (14) are installed on the mold movable plate (7) and are opened for injection molding work (first process).

In order to be installed on the fixed-side shape plate 11, the fixed-side attachment plate 13 is assembled on the rear surface of the fixed-side shape plate 11 to be detachably installed on the fixed-body plate 6 .

In addition, the movable side shape plate 12 is assembled to the movable side attaching plate 14 and detachably attached to the mold movable plate 7 which can move along the mold guide bar 5 toward the mold clamping plate 6. It is installed as possible.

In addition, although the movable side shape plate 12 is not shown in detail in the drawing, it is not fixed to the movable side attachment plate 14 and is moved from the movable side attachment plate 14 to the up / down or left and right directions by a guide rail or the like. It can be installed to slide by. At this time, the moving means from the operation panel 8 by a connecting bar 15a connected to the movable side attachment plate 14 or the movable side attachment plate 12 and the moving device 15 attached to the mold movable plate 7 It is moved by the operation of a pneumatic cylinder or server motor under control.

The product taking-out device 20 serves to take out the finished product from the movable side shape plate by a take-out mechanism (not shown in the figure) of the mold movable plate 7.

In the cavity for molding the injection molding machine 1, the fixed side-shaped plate 11 has a fixed-side cavity 18 in a concave shape, which is an arbitrary reference point at one side position along the mold surface 23 at the mold center 38. The movable side core plate 26 is formed on the movable side shape plate 12 which is disposed on the fixed mold product center 31 and penetrates and faces the runner / gate 17 connected to the sprue 16. A movable mold product having a concave movable side cavity (19) on the movable side shape plate (12) is an arbitrary reference point along the movable side mold surface (24) at a position on the opposite side of the nasal cavity (18) from the mold center (38). The fixed side core plate 25 disposed on the center 32 and facing the fixed side core plate 25 penetrates the runner / gate 17 connected to the sprue 16.

The surface treatment plate moving device 22 connected to the surface treatment plate 21 includes a fixed side shape plate 11 and a fixed side attachment plate 13 or a movable side shape plate 12 and a movable side attachment plate 14 of a mold. Alternatively, the mold clamping plate 6 and the mold movable plate 7 are installed on the side surfaces, and the surface treatment plate 21 enters and exits the mold molded by the operation of the pneumatic cylinder attached in the surface treatment plate moving device 22. It plays a role.

In the state of FIG. 3, in the injection molding operation, the plastic resin is heated by the heater of the injection cylinder in the injection stand 3.

Here, the one cycle of the molding process by the injection molding machine 1 is the mold opening (first process), the first mold closing (the second process), the first injection (the 3-1 process), metering / 1 , 2nd injection (3-2nd process) included or omitted, metering / 1, 2nd injection (3rd process), 1st cooling / weighing (4th process), 1st mold opening (5th process) ), Movable side shape plate linear movement (6th process), 2nd mold closing process (7th process), stop during 2nd mold closing (8th process), or omitted, or 2nd mold closing standby (external device mold) IN / OUT) (the ninth process) is included or omitted, the secondary mold completion (the tenth process), the second injection (the eleventh process) is included or omitted, the second cooling (the twelfth process), the second It consists of mold opening (13th process), product withdrawal (14th process), and linear movement return (15th process), and is structured to repeat from mold opening (1st process) to linear movement return (15th process). .

Here, the order of product take-off (Process 14) and linear movement return (Process 15) may be reversed. That is, the product may be taken out after the linear movement return (the 15th process) (the 14th process).

4 is a cross-sectional view for explaining the primary mold closing, primary injection, metering / 1, secondary injection and primary cooling / metering processes of the injection molding machine according to the present invention.

4, when the injection process start switch of the operation panel 8 is pressed, the mold movable plate 7 moves along the mold guide bar 5 in the longitudinal direction of the injection molding machine 1 to move it. When the mold surface 24 comes into contact with the stationary side mold surface 23, the primary mold closing is completed at the mold mold closing position 37 (second step).

Subsequently, the resin melted from the injection stand 3 is injected into the fixed-side cavity 18 and the movable-side cavity 19 in the mold along the spout 16 and the runner / gate 17 of the mold by pressurization from the injection cylinder. The first injection molding is performed with the fixed side half product 41a and the movable side half body 41b. Here, if the weight of the product coming from the two fixed side cavities 18 and the movable side cavities 19 is greater than the weight that can be molded at one time in the injection molding machine 3 of the injection molding machine 1, two cavities (18, 19) One cavity gate is closed and only the remaining cavity gate is opened to form first (step 3-1), and after weighing, the other gate is closed and the gate of the other cavity that has been blocked is opened and formed (No. 3- 2nd process).

Thereafter, the fixed side half product 41a and the movable side half body 41b are solidified by a cooling process in a mold (fourth step).

That is, the injection molding in FIG. 4 is mold opening (first process), primary mold closing (second process), primary injection (3-1 process), metering / 1, secondary injection (3-2) Process), primary cooling / metering (fourth process).

5 is a cross-sectional view for explaining the primary mold opening process of the injection molding machine according to the present invention.

As shown in FIG. 5, when the fixed side panel product 41a and the movable side panel product 41b are solidified by primary cooling (fourth process) in the mold for a predetermined cooling time on the operation panel 8, the mold part The movable side mold surface 24 of the movable side mold plate 12 installed on the mold body movable plate 7 of the body 4 is moved backward by the mold movable plate 7 to the mold opening completion position 34, so that the primary mold The dog is done. At this time, the fixed-side shape plate 11 and the fixed-side attachment plate 13 are fixed to the mold-shaped fixed plate 6. In addition, the fixed side half body 41a remains in the fixed side cavity 18, and the movable side half body 41b remains in the movable side cavity 19.

Here, the mold opening of general injection molding should be sufficiently open as far as the product can be taken out, but since the first mold opening (the fifth process) is for moving the movable side mold plate 7, it is set shorter than the moving distance of the mold opening for taking out. Can be.

Figure 6 is a cross-sectional view for explaining the linear movement process of the movable side of the injection molding machine according to the present invention.

As shown in FIG. 6, the movable side shape plate 12 is in the downward direction by the operation of the moving device 15 installed on the side of the movable side attachment plate 14 and the connecting bar 15a. It is linearly moved to the position 33 so that the movable side cavity center line 32 faces the fixed side cavity center line 31 (sixth process). Here, the moving direction of the movable side shape plate 12 may be set in the upper direction or the left and right directions depending on the characteristics of the product and the installation position of the moving device.

Here, in general injection molding operation, when the mold is opened, the product is taken out and must be repeated from the mold opening process again. However, the present invention includes the movable side shape plate 12 according to the mold movement signal set in the menu of the operation panel 8. It is structured to move in the downward direction along the movable side mounting plate (14).

7 is a cross-sectional view for explaining the secondary mold closing process of the injection molding machine according to the present invention.

As shown in FIG. 7, the mold movable plate 7 moves forward from the mold opening completion position 34 to perform the next process of mold closing, so that the movable side mold surface 24 is fixed to the arbitrary stop position 35. The plate 11 is moved closer to the direction (seventh process).

Here, the mold closing operation is such that the movable side mold surface 24 formed on the mold movable mold plate 7 moves forward in the direction of the fixed side mold plate 11 installed on the mold clamping plate 6 to abut against the fixed side mold surface 23. In other words, the speed and pressure control according to the distance from the mold opening to the mold closing is operated by a menu and an input box previously input to the operation panel 8 of the injection molding machine 1.

8 is a cross-sectional view for explaining the stop process during the secondary mold closing of the injection molding machine according to the present invention.

As shown in Fig. 8, the mold movable plate 7 is moved to the set speed pressure value of the operation panel 8 according to the divided distance, so that the movable side mold surface 24 continues to pass through the arbitrary stop position 35. It is moved and is stopped at the desired mold stop position 36 immediately before the second mold closing (step 8).

During the second mold closing (8th process), the distance from the first mold opening (5th process) position to the 2nd mold (7th process) position of the mold movable plate (7) of the injection molding machine (1) It is controlled and moved under pressure and speed, then stopped at the desired position before the mold closing, and then moved to the second mold closing (10th process) again after the second mold closing standby (9th process).

Here, the function of stopping for a desired time at a desired position during the mold closing process from mold opening to mold closing is operated by a value previously input to the operation panel 8.

However, the mold closing operation of the general injection molding machine is continuously moved without a stop time during the mold closing, and the mold closing proceeds.

9 is a cross-sectional view for explaining a secondary mold closing stop process of the injection molding machine according to the present invention.

As shown in FIG. 9, the surface treatment plate of the surface treatment plate moving device 22 from the outside of the mold between the movable side mold surface 24 and the fixed side mold surface 23 stopped at the mold stop position 36 ( 21) The surfaces of the fixed side products 41a and movable side products 41b made by injection molding are physically or chemically processed (the ninth process).

Here, the surface treatment plate 21 is connected to the pneumatic cylinder of the surface treatment plate moving device 22, and when the mold movable plate 7 is stopped at a desired position, the surface treatment plate 21 is molded by the operation of the pneumatic cylinder. Enter the space between the fixed side product surface 42a and the movable side product surface 42b according to the function of the surface treatment plate 21 to perform surface treatment by heating or coating, and the set stop time of the mold movable plate 7 It is operated by a menu and an input box previously input to the operation panel 8 of the injection molding machine 1 so as to function to retreat to the outside of the mold before the end.

10 is a cross-sectional view for explaining the secondary mold closing, secondary injection, and secondary cooling processes of the injection molding machine according to the present invention.

As shown in FIG. 10, after the surface treatment plate 21 physically or chemically processes the surfaces of the semi-finished products 41a, 41b made by injection molding and returns to a desired position by the surface treatment plate moving device 22, When the secondary mold closing in which the movable side mold surface 24 of the movable side shape plate 12 comes into contact with the fixed side mold surface 23 is completed (Process 10), the fixed side product 41a and the movable side product ( 41b) also comes into contact with the production of the product mating surface 42, and the omission of the standby (the eighth process) to the second mold closing standby (the ninth process) or the second mold closing (the ninth process) is omitted (the eleventh) In the process), the second injection proceeds, and the mold is closed up to the mold closing position 37 where the finished product 40 is made by the second cooling (12th process).

Here, in the injection or injection omission process, the second injection (the eleventh process) proceeds depending on the input value of Yes / No or A / S of the operation panel 8, or the second cooling immediately after the injection omission (the twelfth process- When the second injection (the eleventh process) does not proceed, the second cooling by the stop time set in the menu of the operation panel (8) ) Is done.

11 is a cross-sectional view for explaining the secondary mold opening and product taking out process of the injection molding machine according to the present invention.

As shown in Fig. 11, after the mold movable plate 7 stops for a set mold closing time, the movable side mold plate 12 is secondary to the mold opening completion position 34 by retraction of the mold movable plate 7 The mold is opened (13th process), and then the finished product is released from the movable side cavity 19 by the forward and backward movement of the product taking-out device 20 of the mold.

12 is a cross-sectional view for explaining the process of returning to the linear movement of the movable side shape plate of the injection molding machine according to the present invention.

As shown in FIG. 12, after the finished product 40 is removed from the movable side shape plate 12 by the take-out device 20, the movable side shape plate 12 includes a moving device 15 and a connecting bar 15a. ), The linear movement is returned to the original state from the movable-side shape plate alignment position 33 to the movable-side cavity center line 32, and the mold is opened (first process).

As described above, the present invention refers to (first process) to (fifteenth process) made from FIGS. 4 to 12 as one cycle, which is one forming process.

On the other hand, when the injection process start switch of the operation panel 8 of the injection molding machine 1 is set to an automatic mode, one cycle from (1st process) to (15th process) is continuously repeated.

As described above, the molding method of the injection molding machine according to the present invention, the mold closing operation and the movement operation of the mold without bonding or surface treatment of two semi-finished products formed by the primary process in the injection molding machine by separate equipment By assembling and completing the secondary process by controlling such as, it is possible to shorten the molding time by reducing the number of processes of the product and lower the manufacturing cost to supply the market at an affordable price.

In the foregoing, although specific embodiments of the present invention have been described and illustrated, the present invention is not limited to the described embodiments, and it is common knowledge in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is obvious to those who have it. Therefore, such modifications or variations should not be individually understood from the technical spirit or viewpoint of the present invention, and the modified embodiments should belong to the claims of the present invention.

1: Injection molding machine 2: Injection part body
3: Injection stand 4: Mold body
5: template guide tie 6: mold clamping template
7: Mold movable mold plate 8: Operation panel
11: Fixed side shape plate 12: Movable side shape plate
13: fixed side mounting plate 14: movable side mounting plate
15: mobile device 15a: connection bar
16: Tanggu 17: Runner / Gate
18: fixed-side cavity 19: movable-side cavity
20: product take-out device 21: surface treatment plate
22: surface treatment plate moving device 23: fixed side mold surface
24: movable side mold surface 25: fixed side core
26: movable side core 31: fixed side cavity center line
32: movable side cavity center line 33: movable side contour plate alignment position
34: mold open position 35: random stop position
36: mold stop position 37: mold mold closing position
38: mold center line 40: finished product
41a: fixed side products 41b: movable side products
42: product engaging surface 42a: fixed side product surface
42b: movable side product surface

Claims (4)

After injection molding with thermoplastic resin in one or two or more concave cavities on the fixed and movable sides of the injection mold mounted on the injection molding machine, fusion of two products molded on the fixed and movable sides in the mold In order, either side of the mold moves linearly to face each other and heats and melts the surface between the two products to melt them into one by means of mold closing, or after moving, they are joined to each other by secondary injection into the gap between the two products to form one. In the molding method of the injection molding machine for making a finished product,
Include or omit the mold opening (first process), first mold closing (second process), first injection (3-1 process), metering / 1, second injection (3-2 process) of the mold, or Weighing / 1st, 2nd injection (3rd-2nd process), 1st cooling / weighing (4th process), 1st mold opening (5th process), linear movement of movable side plate (6th process), 2nd mold closing Progress (7th process), stop or stop during the 2nd mold closing (8th process), 2nd mold stop waiting (IN / OUT in the external device mold) (9th process) is included or omitted, or 2nd Completion of mold closing (10th process), 2nd injection (11th process) included or omitted, 2nd cooling (12th process), 2nd mold opening (13th process), product withdrawal (14th process), linear movement It is made of one cycle of return (15th process), and the molding method of the injection molding machine is characterized in that it is repeated from the mold opening (the first process) to the linear movement return (the 15th process). According to claim 1,
The stop (8th process) during the mold closing is controlled by the pressure and speed of the stages from the starting position of the 2nd mold closing to the 2nd mold closing position, and the moving plate is stopped at the desired position before the mold closing. After the second mold closing stop (the ninth process), the second mold closing method is moved back to the completion of the second mold closing (second process), and the molding method of the injection molding machine characterized in that the completion of the second mold closing. According to claim 1,
The second injection (the eleventh process) may be selectively omitted, the second injection (the eleventh process) proceeds according to the input value of Yes / No or A / B of the operation panel of the injection molding machine, or When the injection is omitted, the secondary cooling (12th process-time is set) proceeds to the molding method of the injection molding machine characterized in that. The method of claim 1.
The weighing / 1st and 2nd injection (step 3-2) is the first of the two cavities when the weight of the product coming from the two cavities of the injection molding machine is greater than the weight that can be molded at once in the injection molding machine. In the first injection (3-1 process), the gate of one cavity is closed and the rest of the cavity is opened and molded first, and the gate of one cavity that is blocked after the weighing of the first and second injections (3-2 process) The molding method of the injection molding machine, characterized in that to open and mold.

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