JPH02283412A - Molten material volume adjusting type molding die device - Google Patents

Abstract

PURPOSE:To stop feeding molten material or a molding material easily and adjust the feeding of molten material volume by making molten material flow lines from a main rubber to two distribution runners variable all through from total closing to total opening. CONSTITUTION:Rotary valves 60-63 are of same structure respectively, and are provided respectively with a valve port 82, a valve land 84 forming said valve port 82 and an inserting hole 85 for a fixed screw on the round upper surface of almost cylindrical valves 80. When the valve 80 is rotated freely by loosening a setscrew 86 at the three-forked point of main and distribution runners of a mold 20, the pivoting amount of the valve 80 is adjusted. Therefore, molten material lines can be stopped at the junction from the main runner to the distribution runners, or the opening degree can be adjusted to adjust the molten material volume by opening and closing by means of the valve land 84. Thus, a mold processed product of high quality can be manufactured by the simple operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mold mainly using a plastic material as an injection molding material, and particularly to a mold device comprising a pair of fixed molds and a movable mold. When molded products of different sizes and shapes are simultaneously molded using the same molding material, the appropriate amount of material can be distributed to each molding hole, and the molding process in any of the molding holes can be stopped if necessary. This article relates to a molding mold device that can adjust the amount of hot water. Note that the present invention is not limited to plastic injection molds only, but is also applicable to die-cast mold devices using metal hot water.

[Prior art]

In general, in the injection molding process of plastic materials using a mold device, when molding many identical products at the same time, the mold device has multiple molding holes for the same part and multiple cores corresponding to the holes in the mold. A mold structure that is evenly distributed and arranged over the entire surface is recommended.

On the other hand, molded products with different shapes and dimensions, although they are not the same product but are related to each other, can be molded all at once using molding holes and cores that correspond to the shape and dimensions of each product in the same mold. In such cases,
Molding holes of different shapes and sizes are distributed and arranged within the same mold. However, in the latter case, the product molding quantities are different, for example, when the same mold is used to mold different numbers of AXBXCSD products such as 100, 200, 500, 600, etc. There is also.

In such cases, if the number of pieces to be molded is small, if necessary, plug the gate provided between the raw material molding material (hot water) supply port and the molding hole, or plug the runner with a certain amount of hot water. As shown in Figures 8 and 8, a method is adopted in which a piece for opening and closing the amount of hot water is attached to the closed side and set to stop the flow of molding material. Figures 7 and 8 show forming holes 1, 2, 3, and 4 for four types of products on one mold surface of a pair of opposing mold devices.
4 are provided, from the sprue 5 two main runners 6, 7, two distribution runners 8.9 connected to the main runner 6 through a three-way point, and a distribution runner connected to the main runner 7 through a three-way point. 10.11 is provided, and material hot water such as plastic material is supplied from the sprue 5 to each molding hole 1 to 4 via the main runners 6 and 7 and the distribution runners 8 to 11. At this time, the main runner 6. Each of the distribution runners 8 to 11 is provided with a screw-type piece 12 for opening and closing the hot water quantity. If the groove 12a of the piece 12 shown in cross section in FIG. 8 is aligned with each of the runners, the hot water quantity will be increased. The material molten metal flows, and when misalignment occurs, the amount of molten metal is closed and the material molten metal does not flow into the forming hole. To open and close the hot water amount using the piece 12, the screw on the piece 12 is unlocked, the piece 12 is turned in the opposite direction, and then the screw is screwed again.

[Problem to be solved by the invention]

However, as described above, both the method of plugging the gate and the method of using the piece 12 for opening and closing the hot water flow are complicated to operate, and the plugging of the gate requires the plugging operation by a mold manufacturing expert. However, in the latter case, which uses the piece 12 for opening and closing the hot water volume, the more molded products are molded, the more disadvantageous it is that an extremely large number of pieces are prepared and troublesome work such as replacement is required. This is considered an issue that needs to be resolved. In addition, when there are large and small dimensions such as molding holes 1 to 4, it is not possible to balance the amount of material supplied to each molding hole, so the molding hole where excess material is supplied will have a large gap during injection molding. However, there are disadvantages such as being exposed to water, and this is also an issue that needs to be resolved.

Therefore, the purpose of the present invention is to solve the above-mentioned problems,
When molding various molded products using the same mold equipment,
Improvements have been made so that it is now possible to easily stop the supply of hot water or molding material depending on the number of pieces required, and it is also easy to balance the supply by adjusting the amount of hot water supplied according to differences in shape and size. The purpose of this invention is to provide a mold device that is

[Means to solve the problem]

In view of the above-mentioned object of the invention, the present invention uses a rotary valve to adjust the supply amount of molding material (hot water) to an appropriate amount at the three-pronged point connecting the main runner to the distribution runner, and also to stop the molding material when necessary. It has been made possible to realize it. That is, according to the present invention, in a molding mold device with an adjustable amount of hot water that distributes an appropriate amount of molding hot water from a sprue to a plurality of various types of molding holes via a runner, two Two distribution runners are provided to enable supply of forming melt to the forming holes of different types, and a rotary valve is provided at a three-junction point between the main runner and the two distribution runners, and a rotary valve is provided at a trijunction point between the main runner and the two distribution runners, and the main runner is connected to the two distribution runners. It is an object of the present invention to provide a molding die device with an adjustable flow rate of hot water, which is configured to adjust the flow rate of hot metal by making the flow path of the hot metal variable from fully open to fully open. A plurality of sets of molding holes each including the two different types of molding holes are provided, and each set of molding holes is located on the main runner, on the core of the two distribution runners, and on the three-pronged point of the distribution runner. By supplying an appropriate amount of hot water through the provided rotary valve, it is possible to easily mold a large number of molded products using an appropriate amount of material.

[Effect]

When stopping the molding process in the molding hole of any gourd, set the rotary valve to the fully open position of the hot metal flow path, and set the rotary valve to the appropriate opening amount of the hot metal flow path to stop the supply of molding material. This is because the amount can be adjusted appropriately depending on the size and shape of the hole.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

〔Example〕

FIG. 1 is a plan view illustrating a configuration including a molding hole, a runner, and a rotary valve provided on one mold surface of a molding mold device with an adjustable flow rate consisting of a pair of molds according to an embodiment of the present invention. figure,
FIG. 2 is a side view of a mold device in which the mold shown in FIG. 1 is used as a fixed mold and is paired with the other movable mold, including a cross section taken along the line ■-■; FIG. 3A; FIG. 3B is a plan view and a sectional view showing the structure of one embodiment of the rotary valve according to the present invention;
4A, 4B, and 4C are partial plan views for explaining the runner flow rate adjustment function of the rotary valve of FIG. 3, and FIGS. 5A and 5B are other embodiments of the rotary valve according to the present invention. FIGS. 6A and 6B are partial plan views illustrating the runner flow rate adjustment function of the rotary valve shown in FIG. 5. FIGS.

First, referring to FIG. 1, the mold surface of the mold 20 has a sprue 22 that is opened and formed at approximately the center to introduce the molding material, and main runners that are formed radially in four directions from the sprue 22. -24, 26, 28, 30, molding holes for molding molded products of different types (shapes and dimensions) (here, they are typically shown as circular external products, but the molding shape may vary depending on the product shape) different) 32, 33... 39, and distribution runners 42, 44, 54, 56 that can connect these forming holes 32 to 39 and the main runners 24 to 30,
Rotary valves 60, 61, 62, and 63 are provided at the three-pronged point between the main runner and the distribution runner.

Here, referring to FIG. 2, several of the molds 20 shown in FIG. 1 are placed on the platen 19 as stationary side molds, and
The movable mold 21 that cooperates with the appropriate spacer block 70
The movable mold 21 is usually attached to the movable platen 71 via the movable mold 21, and the movable mold 21 normally has male mold parts 72, 73, etc. corresponding to the molding holes 32 to 39, etc. of the fixed mold 20, like well-known movable molds. This allows both molds 20 and 21 to function as a pair of molding mold devices when they collide. Therefore, between the two molds 20 and 21, there is a guide bush 74 that guides the abutting and separating movements of both molds, a guide pin 75, an ejector pin 76 for taking out the molded product, and a return pin for returning the ejector pin 76. 77 is provided. Incidentally, the sprue 22 is formed by a passage formed in a spool 78 attached to a substantially central portion of the fixed mold 20, and the spool 78 is aligned and attached to, for example, a material supply port of an injection molding machine with a positioning ring 79. Ru.

Now, according to the present invention, when performing molding by supplying hot water (molding material) from the sprue 22 to the different types of molding holes 32 to 39, depending on the difference in the number of molded products to be processed, The supply of hot water is stopped by adjusting the rotation of the rotary valves 60 to 63, and the amount of hot water to be supplied is adjusted and set to an appropriate amount by the rotary valves 60 to 63 according to the difference in the amount of material required for molding the molded product. However, even though the molten metal is supplied from the same sprue 22, the amount of molten metal supplied to each molding hole 32, . . . , 39, etc. is optimized.

Here, the rotary valves 60 to 63 have the same structure. For example, in the first embodiment, as shown in FIGS. 3A and 3B, the valve port 82 forming the hot water flow path, It has a structure in which a valve land 84 that forms a valve land 84 and a fixing screw insertion hole 85 are provided on the circular upper surface of a substantially cylindrical valve body 80, and the valve body 80 is attached to the main part of the mold 20 and the three-pronged point of the distribution runner. (Fig. 1), when the set screw 86 is loosened to make it freely rotatable, the amount of rotation of the valve body 80 is adjusted, and the valve closing action by the valve land 84 allows the connection point from the main runner to the distribution runner to be adjusted. The vortex flow rate can be adjusted appropriately by closing the hot water flow path or adjusting the degree of opening.

In FIG. 1, by way of example, the rotary valve 60 is shown in which hot water is supplied to both the pair of forming holes 32 and 33 from the main runner 24 via the distribution runners 42, 44;
1 indicates that the amount of hot water communicating from the main runner 26 to the other two forming holes 34.35 via the distribution runners 46.48 is completely closed at the three-pronged point of the three runners. It shows. Similarly, another set of molded holes 36.3
The rotary valve 62 completely closes the supply to the molding holes 38 and 7, and a smaller amount of hot water is supplied to the small-diameter molding holes 39 than the other molding hole 38 by adjusting the rotary valve 63 to one set of molding holes 38 and 39. The illustration shows that the device is in an adjusted state. Note that the distribution runners 42 to 56 have shapes of the corresponding molded holes 32 to 39 in advance,
Those that require a large amount of hot water due to their dimensions should be formed with wide or deep grooves, and those that require only a small amount of hot water may be formed with narrow width or shallow grooves.

Now, referring to FIGS. 4A to 4C, the rotary valve 60
- 63 are illustrated to explain the hot water flow opening/closing operation for each of the rotary valves 60 and 63. To explain the rotary valve 60, a cylindrical valve body 80 is connected to the main runner 24 by using a protrusion or groove 87 formed in a valve land 84. FIG. 4A shows both distribution runners 421.4.
4 are in communication with the main runner 24, thus indicating that hot water is supplied from arrow S to arrows S1 and S2.

In FIG. 4B, the hot water supply path from the main runner 24 to the distribution runner 44 is closed by the valve land 84, so that the hot water supply is stopped. At this time, the main runner 24
The amount of hot water flowing from the to the distribution runner 42 is in the open state, so hot water can be supplied.

FIG. 4C shows that the valve body 80 of the rotary valve 60 is rotated so that the valve land 84 communicates between the main runner 24 and the distribution runner 44 in a fully open state so that a large amount of hot water can be supplied; The opening between the main runner 24 and the distribution runner 42 is shown to be reduced in order to reduce the amount of hot water supplied.

In other words, the valve port 82 is fully open between the runners 24.44 and is partially open between the runners 24.42. In this case, in order to adjust the amount of partial opening to an appropriate amount, the end of the valve port 82 on the runner 24.44 side is in a state beyond the starting point of the distribution runner 44. Since the connection portion with the runner 44 maintains a constant flow path area, the amount of hot water supplied to the distribution runner 44 side does not particularly increase.

As described above, when each of the rotary valves 60 to 63 adjusts its rotation amount, the supply of hot water to the corresponding forming hole 32 to 39 can be stopped or adjusted to an appropriate amount, so that the molding material to the forming hole can be stopped. Therefore, the molded product can be beautifully molded without protruding a large amount of particles upon completion of the molding process. In addition, the rotary valves 60 to 63 are simple enough for a molding operator to easily rotate and adjust the amount of hot water supplied, and even when there are variations in the number of molded products between different types of molded products, the rotary valves 60 to 63 can easily be used in small quantities. It is also easy to stop the supply of molding material (hot water) in order to interrupt the molding of the product.

In general, injection molding equipment for plastic materials is considered to be a means of mass production.Injection molding of small-volume products requires a heavy burden on mold equipment, and mold changeover time occupies man-hours, and molding setup time is reduced. However, as is clear from the above, it is possible to apply the present invention and adjust the material supply by simply operating a rotary valve even when molding mass-produced products. This can be done properly and without any burden on the setup work simply by the worker himself/herself, so productivity can be extremely improved. Furthermore, as long as the same material is used, there is an advantage that a wide variety of molded products can be molded with high efficiency within a certain amount of time without the need for changing materials. This brings about a favorable result that significantly reduces processing costs, which is the most important factor for molded products.

FIGS. 5A and 5B show another embodiment of the rotary valves 60 to 63 according to the present invention, in which the supply of hot water can be more finely adjusted.

That is, in the rotary valve of this embodiment, a valve land 184 defining a valve port 182 is provided as a fixed valve land on the upper surface of a cylindrical valve body 180, and a rotary valve land is provided next to this fixed valve land 184. 188 are provided coaxially, and by rotating this rotary valve land 188 left and right with respect to the valve body 180 using a protrusion or groove 187, the opening area of the valve port 182 can be adjusted.

FIG. 6A shows a state in which both the fixed and movable valve lands 184 and 188 are brought into close contact with each other to maximize the open circuit area of the valve port 182. Thus, for example, there is a maximum amount of hot water being supplied from the main runner 24 to the distribution runners 42,44.

On the other hand, FIG. 6B shows the main runner 24 by rotating the movable valve land 188 away from the fixed valve land 184.
At this time, the upper portion 182a of the valve port 182 is separated from the main runner 24, and the lower portion 182a of the valve port 182 is separated from the main runner 24. Only part is main runner-24
It functions to communicate the flow to the distribution runner 42. By providing the movable valve land 188 in this way, for example, the movable valve land 188 can be further removed from the state shown in FIG. 6B.
8 clockwise, it is also possible to further finely adjust the open circuit area between the main runner 24 and the distribution runner 42;
The function of the rotary valve of the previous embodiment can be exceeded in that fine adjustment can be made while maintaining the closed state of the rotary valve 4, and the adjustment of the supply amount of hot water can be further optimized.

According to the rotary valve with this configuration, the communication state between the main runner 24 and both distribution runners 42 and 44 can be adjusted independently by adjusting the rotation of the movable valve land 188, so that the molding finish accuracy of the molded product can be further improved. It is also possible to improve it.

〔Effect of the invention〕

As can be understood through the description of the above embodiments, the present invention is directed to a molding die device with a molten metal flow rate adjustment type that distributes an appropriate amount of molding molten metal from a sprue to a plurality of various types of molding holes via a runner. Two distribution runners are provided to enable the supply of forming melt from one main runner to two different types of forming holes, and a rotary valve is provided at the three-way point between the main runner and the two distribution runners. The flow path of the hot water to the two distribution runners can be finely varied from fully open to fully open, making it possible to adjust the amount of hot water.This enables easy operation to supply the optimum amount of molding material to the molding section, producing high-quality molded products. This means that you can obtain it. In addition, if you mold small-volume products in combination with large-volume molded products,
As long as they are made of the same material, molding can be accomplished efficiently.
Therefore, especially in plastic injection molding, cost reduction can be further improved. Furthermore, an effect can be obtained in which the molding worker can easily adjust the supply amount of hot water while visually checking the molding process at the molding site so as to obtain the optimum molded finish state.

[Brief explanation of drawings]

FIG. 1 is a plan view illustrating a configuration including a molding hole, a runner, and a rotary valve provided on one mold surface of a molding mold device with an adjustable flow rate consisting of a pair of molds according to an embodiment of the present invention. figure,
FIG. 2 is a side view of a mold device in which the mold shown in FIG. 1 is used as a fixed mold and is paired with the other movable mold, including a cross section taken along the line ■-■; FIG. 3A; FIG. 3B is a plan view and a sectional view showing the structure of one embodiment of the rotary valve according to the present invention;
4A, 4B, and 4C are partial plan views for explaining the runner flow rate adjustment function of the rotary valve of FIG. 3, and FIGS. 5A and 5B are other embodiments of the rotary valve according to the present invention. 6A and 6B are partial plan views illustrating the runner flow rate adjustment function of the rotary valve shown in FIG. 5, and FIG. 7 shows the structure of a conventional molding die device FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7; 20... Mold, 22... Main runner 48, 50, 52, 54, 62, 63 Rotary valve,... Sprue, 24.26.28.30 30-39... Molding hole, 42 .44.46.56・
...Distribution runner 60.61.82...Valve port, 84...Valve land. Yotsuyabu

Claims (1)

[Scope of Claims] 1. A molding device with an adjustable flow rate that distributes and supplies an appropriate amount of molding melt from a sprue to a plurality of various molding holes via a runner, wherein two main runners are connected to one main runner communicating with the sprue. Two distribution runners are provided to enable supply of forming melt to the forming holes of different types, and a rotary valve is provided at a three-junction point between the main runner and the two distribution runners, and a rotary valve is provided at a trijunction point between the main runner and the two distribution runners, and the main runner is connected to the two distribution runners. A molding device with an adjustable flow rate of hot water, characterized by the ability to adjust the flow rate of hot water by making the flow path variable from fully closed to fully open. 2. A plurality of sets of molding holes each including the two different types of molding holes are provided, and each set of molding holes is located at the main runner, the two distribution runners, and the triangular point of the main and distribution runners, respectively. 2. The hot water amount adjustable forming mold device according to claim 1, wherein an appropriate amount of hot water is supplied through the provided rotary valve. 3. The hot water amount adjustment according to claim 1 or 2, wherein the rotary valve has a configuration in which a valve land forming a valve port communicating with the main runner and the distribution runner is provided on a circular upper surface of a substantially cylindrical valve body. Type molding mold equipment. 4. The rotary valve includes a fixed valve land that forms a valve port that communicates the main runner and the distribution runner on the circular upper surface of a substantially cylindrical valve body, and a fixed valve land that forms a valve port that communicates the main runner and the distribution runner, and a fixed valve land that forms a valve port that communicates with the main runner and the distribution runner, and a fixed valve land that forms a valve port that communicates with the main runner and the distribution runner, and a fixed valve land that forms a valve port that communicates with the main runner and the distribution runner. 3. The molding die device according to claim 1, further comprising a movable valve land rotatably provided on the upper surface.