JPH0516255U - 1-chip multi-point gate structure in injection molding die for direct molding - Google Patents

Abstract

(57) [Summary] [Purpose] In an injection molding die for direct molding that completely eliminates runners that occur during molding.
By providing a plurality of valve shanks on the tip at the bottom of the gate / hole opening / closing valve, this is a device that can achieve the purpose of a multi-point gate with one tip. [Structure] A temperature sensor T and a rod-shaped heater H are built in a gate / hole opening / closing valve 7, and a plurality of valve shanks 7 are attached to a chip C at the lower end of the opening / closing valve 7.
1-chip multi-point gate structure configured such that the gate hole 6'provided with ′ is made to move up and down D by the fluid pressure drive source 8. [Effects] For the synthetic resin molding industry and also in terms of resources such as raw materials and energy, there are enormous effects such as improved productivity, improved quality, resource saving, etc.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention, despite the fact that research and development has been carried out for some time in the synthetic resin injection molding industry, is still today, still today, the quality of molded products, the separation of molded products in the mold. Anomalous traces (overflow phenomenon) of the contact part, etc., so to speak, with regard to runnerless molding, which is in a halfway stage where satisfaction cannot be achieved in terms of various functions intended by the developer, One chip in the injection molding die for direct molding, which is epoch-making that led to the solution of various conditions that were impossible to do due to various design restrictions. This is the point gate structure.

[0002]

[Prior Art]

 In the past, there have been many runner-less molding companies called injection-molding industry that have been performing daily activities in the injection molding industry. That is, he was angry with many problems far from the construction method. In other words, the starting point of the idea of working that is runnerless molding is that only the molded product part is cooled and solidified at the time of molding, and all the routes up to this point always maintain a fluid state of melt. Since there is an absolute condition that the continuous molding work must be continued, there is no choice but to make many means and construction methods complicated and difficult. It can be said that it has been driven to the point where there is nothing. From this point of view, if the runners being molded are completely eliminated, the molding method will be around the point where there will be no suitable method other than direct molding. However, although it can be simply referred to as direct molding, it is said that the two phases of solid and liquid coexist at the zero contact. It can be said that there is a superhuman problem that is impossible to achieve. From the above-mentioned viewpoint, it is impossible to completely clear such a problem. A recessed portion of about 0.5 mm is drilled and placed, and an abnormal trace (which is called an overflow phenomenon) within the dimension is absorbed dimensionally. It can be said that the conventional technology is that the sesame is somehow converted. As described above, with the current technology of runnerless molding, there are various restrictions and regulated dimensions, not to mention the design dimension, of course, in the conventional runner. In Les Molding, there were still many problems.

[0003]

[Problems to be solved by the device]

 As described in detail in the previous section, there were many problems hidden in runnerless molding based on the conventional construction method. It can be said that the present invention has been made in view of such a point and is proposed, and the problems to be solved by the present invention are approximately in the following points. That is, based on the basic line of runnerless molding, and in the process of injection molding, only the cavitate is filled with molten resin, and the resin in the runner up to that point is injected next after the cavitating is completed. In preparation for the cycle, various molding conditions such as fluidity are good, and like the before injection cycle, it is absolutely necessary to keep it in a stable state. During the cycle process of `` resin cooling cycle → resin curing → molded product knockout '', there are absolutely some better points that can completely satisfy the molding conditions of the molding machine cylinder, and catch these better points. Based on the view that it can be easily done by making full use of electronic instruments at present, the basics of this problem In which was not achieved the Do not resolve. In addition, the above-mentioned basic concept is also taken into consideration regarding the design dimensions, including the design restrictions that have been regarded as absolutely impossible with the conventional runnerless molding technology. In addition, for example, for a molded product with a thickness of 0.5 mm or less, or for a rib-like engraved part with a width of 2 mm or less, an injection port can never be provided ... It was possible to solve the problem all at once by processing the tip of the.

[0004]

[Means for Solving the Problems]

 From the point of view described in detail above, the present invention is intended to fundamentally solve various problems in conventional runnerless molding, so that a perfect runnerless molding in the original sense is established and molding is performed. In order to achieve the purpose of saying that there are no restrictions on the design dimensions of molds, the following four items are listed. That is, no overflow or stringing occurs during the molding process. The next cycle can be smoothly and continuously molded. The traces of the gate opening of the molded product should be as traceable as possible. The chip, which is an element of the gate structure, is single and has a multi-point gate structure. The present invention has been devised in the following order in order to clear the above four items. In other words, in daily molding work, "the ejector pin temperature and the cavitation temperature are almost similar to each other, and the temperature is much lower than the resin temperature. Therefore, in perfect runnerless molding, That is, in direct molding, the temperature at the valve tip and the resin temperature are similar and high immediately after the end of injection. Liquidity will remain. In other words, even if the ejector pin has a certain allowable temperature range even if it is not isothermal, there is always a temperature sensor for detecting the temperature inside the valve. Due to the built-in rod-shaped heater, and the valve mechanism for opening and closing the gate, the upper and lower motions (Up-Down motion) allow multiple shank portions at the tip of the chip to be formed facing each other. The contact gate bush is fitted in each gate hole, and the flow of the resin is stopped. That is, regarding the gate / hole opening / closing valve 7, an appropriate number (2, 3, 4, ..., N) is appropriately selected and determined at the lower end. In the embodiment, three valves are selected. A plurality of shanks 7 ', which are formed to project, can be freely inserted into the gate holes 6', ... The upper and lower ends are screwed to the fluid pressure drive source 8 (the air cylinder is shown in the embodiment shown in the figure) and mounted so that the ascending U and descending D movements are self-explanatory. The temperature sensor T and the rod-shaped heater H are built in the valve for use, so that the upward U movement and the downward D movement are set at appropriate intervals based on the signal from the control device provided in the molding machine. Structure that repeats continuously It was done.

[0005]

[Action]

 Since the one-chip multi-point gate structure in the injection molding die for direct molding according to the present invention is based on the structure as described above, the gate hole is as shown in FIGS. A deep hole is formed in the opening / closing valve 7, and an appropriate number (2, 3, ..., N, any number of 3 is shown in the example) is projected on the tip C of the lower end. A plurality of valve shanks 7 ', ... Can be installed so that they can be fitted respectively into the gate holes 6', .. of the contact bush 6 fixedly facing the product engraving portion 5 of the cavitation 4. On the other hand, the upper end is screwed to the fluid drive source 8 so that it can move up and down D freely, and the temperature sensor T and the rod-shaped heater H are built in the deep hole drilling part. Control device provided (Fig. The fluid pressure drive source 8 is actuated based on the signal from (1), and when the gate / hole opening / closing valve 7 rises U, the cavitating product is melted in the engraving portion 5. The resin M is injected and filled, and after a suitable interval, the gate hole opening / closing valve 7 is lowered D, and the gate hole 6 ′ of the contact gate bush 6 is connected to the valve shank 7. Then, the operation is repeated by repeating the operation by closing with ', ... However, during such an operation cycle, since the temperature sensor T is built in and the rod-shaped heater H is also inserted inside the main body near the tip C of the lower end of the gate / hole opening / closing valve 7, it is always accurate. Since the temperature can be caught and the correct information is always obtained, the molding machine cylinder (omitted in the figure) can be operated in the best condition with proper interval setting. Complete the ding. In the embodiments, 9 is a spool bush, 10 is a hollow set, 11 is a supporter sleeve, and CL is a thermal expansion absorbing clearance. Since the present invention is configured as described above, the upward U and downward D movements of the gate / hole opening / closing valve 7 are all related to the molding conditions in the cylinder (not shown) of the molding machine and the gate The hole opening / closing valve 7 and the valve opening / closing valve 7 can move under the best condition, and the chip C at the lower end of the gate hole opening / closing valve 7 still has an appropriate number of protruding valve shanks 7 ', However, it can be machined in any way by turning, and the gate hole 6 ', ... of the contact bush 6 can be bored in confrontation with the valve shank 7' ,. Therefore, there is no problem in terms of implementation.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. First, in the present embodiment, the gate / hole opening / closing valve 7 is provided in the injection molding die apparatus for direct molding, which is formed by combining the top plate 1, the manifold main body 2 and the cavity tape plate 3 and the like. FIG. 1 is a partially omitted sectional front view showing the entire body, FIG. 2 is an enlarged view of a main part A in FIG. 1, and FIG. 3 is B in FIG. -B arrow views are shown respectively. That is, all the gate / hole opening / closing valves 7 comply with the best molding conditions in the molding machine cylinder (not shown), and the signal is output from the control device (not shown) provided in the molding machine. Based on the above, for example, when the gate hole opening / closing valve 7 rises U, the valve shank 7 ′, from the gate hole 6 ′, ... Of the contact gate bush 6 fixed to face the product engraving portion 5 of the cavitation 4. .. comes out, the valve goes from the closed state to the open state, and the molten resin M.sub.2 is injected and filled into the engraved portion 5 of the cavitating product. However, after a certain interval, the gate hole opening / closing valve 7 in the upward and upward U position moves downward D again in response to the signal from the control device again, so that the aforementioned gate hole 6 ′ ,. The valve shank 7 '... can be completely closed. Thus, the one cycle operation in the molding operation is completed, and the following operations are continuously repeated.

[0007]

[Effect of the device]

 As described above in detail, according to the present invention, the following practical effects can be obtained. The gate hole opening / closing valve has a structure in which a temperature sensor T and a rod-shaped heater H are housed therein, and the main body of the gate hole opening / closing valve 7 is moved up and down D (Up-Down motion). ) Severe temperature control that can satisfy the most required optimum conditions and good timing of up / down operation can be accurately caught depending on the conditions. Therefore, complete runnerless molding, that is, true runnerless molding work = direct molding can be performed. The chip C at the lower end of the gate / hole opening / closing valve 7 can be freely turned with the valve shank 7 ', ... as required, which is a design dimension that has not been solved until now. The problem of was disappeared. Since the runners have been completely eliminated, the quality of molded products has improved dramatically. Since stable molding is possible, 100% of resin quality can be exhibited. Resource loss and energy loss are significantly reduced. Post-finishing processing etc. will be complete. Therefore, from the point of view, from the national standpoint of Japan or from a global scale, resource saving, energy saving, etc., and their practical effects are enormous.

[Brief description of drawings]

FIG. 1 shows an embodiment according to the present invention, in which a partially omitted sectional front view showing the entire injection molding mold for direct molding is shown.

FIG. 2 shows an enlarged view of a main part A in FIG.

FIG. 3 is a view taken along the line BB in FIG.

[Explanation of symbols]

 1 Top plate 2 Manifold body 3 Cavity tape 4 Cavitation 5 Product engraving part 6 Contact gate bush 6'Gate hole 7 Gate hole opening / closing valve 7'Valve shank 8 Fluid pressure drive source 9 Spool bush 10 Hollow set 11 Supporter sleeve A Main part C Chip CL Clearance for absorbing thermal expansion H Rod heater T Temperature sensor U Up (↑ in the figure) D Down (↓ in the figure)

Claims (1)

[Scope of utility model registration request] 1. A top plate 1, a manifold body 2
In addition, in the injection molding die device for direct molding, which is formed by combining the cavitating plate 3 and the like, a plurality of valve shanks 7 ′, ... The contact gate bush 6 fixed to face the product engraving portion 5 is installed so as to be fitted into the gate holes 6 ′, ... Of the contact gate bush 6, respectively, while the upper end portion is screwed to the fluid pressure drive source 8. As much as possible ascend U and descend D so that it can be freely moved, the temperature sensor T and the rod-shaped heater H are installed inside the gate / hole opening / closing valve.
As a result of the signal from the control device provided in the molding machine, when the valve 7 for opening / closing the gate / hole is raised U when the valve 7 is opened, the cavitating product is melted into the engraved portion 5. The resin M is injected and filled, and after an appropriate interval, the gate / hole opening / closing valve 7 is lowered D, and the gate holes 6 ', ... Of the contact gate bush 6 are opened to the valve shank 7'. ，
The one-chip multi-point gate structure in the injection molding die for direct molding, which is characterized in that it is configured to be closed by.