JPS6364709A - Molding method for mold form - Google Patents

Abstract

PURPOSE:To contrive improvement of yield and reduction of a casting loss of a stock solution and production costs, by a method wherein a mold tilting equipment is tilted arbitrarily and freely within a specific angular range by making use of the mold tilting equipment at the time of casting of the stock solution. CONSTITUTION:A mold tilting equipment is tilted arbitrarily and freely in a range of -90-+90 deg. at the time of casting of a stock solution, in molding of a mold form by a reaction injection molding method. With this construction, as the stock solution can be dispersed uniformly on the whole surface of a bottom force 5, an air pocket and short thickness do not occur. Then a tilting angle, a starting tie for tilting and a tilting speed can be set up freely and easily and it is easy to control it to the optimum condition is molding a product of whatever form it may be. A loss of the stock solution at the time of the casting is nearly zero, as a directly below-type one-point casting (refer to the second figure) through a high-pressure casting head 1 or the casting of the stock solution through a distributor for the casting of the stock solution is used for the casting of the stock solution.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a reaction injection molding method (used in the field of manufacturing mold forms for automobile seat cushions, motorcycle seat cushions, headrests, and gJl interior products)
The present invention relates to a mold form forming method using the RiM method (hereinafter referred to as the RiM method) and the so-called high-speed cure HR method.

[Conventional technology]

Conventionally, as a mold form forming method for various interior products or Fsteria products, for example, as shown in Fig. 7, from the injection of the stock solution to the completion of curing, the mold is placed in a horizontal position and the stock solution is injected using a runner (2). , a method using a device combining a film gate (3), or
Alternatively, if necessary, a 7-ohm mold housing method was adopted in which an after mixer (6) was installed.

[Problem that the invention seeks to solve]

Conventionally, the improvement of yield (yield of good products) and the reduction of injection loss of stock solution in mold 7 ohm molding using the RiM method or the high-speed cure HR method are important issues in addition to reducing product costs.

In order to reduce underfilling, air pockets, etc., which are problems of the prior art, there is a problem in how to uniformly disperse the stock solution injected into the mold throughout the entire lower mold.

The conventional mold form forming method employs a combination of a runner (2) and a film gate (3) as shown in FIG. 7, which has the drawback of a large injection loss of stock solution. Furthermore, if an after mixer (6) is provided to increase the mixing efficiency of the stock solution, the loss of the stock solution will further increase. Therefore, in the present invention, in order to reduce the loss of raw materials, a direct single point injection method from a high-pressure injection head or an injection method via a stock solution injection distributor (see Figure 8) is adopted for injecting the stock solution into the mold. are doing.

Furthermore, in the mold form forming method using the RiM method, if there is no mold tilting device as shown in Figure 7, even if the injection method using the combination K of the runner and film gate is used, the stock solution is dispersed over the entire surface of the lower mold. As a result, many problems such as air pockets and underfilling occur.

Therefore, in the present invention, the angle of 190 degrees to +9
By using a new mold form forming device in which a mold tilting device that rotates by 0 degrees is newly attached to the mold, we have successfully solved all the problems of the conventional mold form forming method by using the above injection method of the present invention. As a result, the present invention was completed.

[Means to solve the problem]

The present invention is a mold form forming method in which a 7-ohm mold is formed by the RiM method, using a mold tilting device for injecting undiluted solution, and tilting the mold tilting device arbitrarily in the range of 190 degrees to +90 degrees. The method for injecting the stock solution into the mold is a direct single-point injection method from a high-pressure injection head, or a 7-ohm molding method using a stock solution injection distributor. Further, the present invention is particularly suitable for the so-called high-speed cure HR method in which a high-pressure foaming machine is used to perform reaction injection molding in a temperature-controlled mold with a variable angle and a high-speed reaction mixture that is well matched.

The mold tilting device of the present invention can be tilted by injecting the stock solution before starting to pour the stock solution into the mold, that is, while the mold is being tilted, or by tilting the mold after starting pouring the stock solution into the mold, or Any method of tilting the mold after the injection of the stock solution into the mold is completed may be adopted.

In addition, the mold tilting device adjusts the angle of the mold in the range of 190 degrees to +90 degrees with respect to the horizontal state of the mold, preferably #i design difficulty,
The angle is set between 145 degrees and +45 degrees from the viewpoint of equipment cost.

Moreover, the mold tilting start time and the tilting speed can also be freely set. The angle of the mold at the start and completion of tilting,
Setting of the inclining start timing, inclining speed, etc. varies depending on the size and shape of the mold form product to be ILT-molded, the injection position of the stock solution, injection conditions, etc., and the conditions that can most improve the yield are selected.

Furthermore, in the present invention, in order to reduce as much as possible the injection loss of raw materials, which was a problem in the prior art, the stock solution is injected by a direct single point injection method from a high-pressure injection head (Fig. 2) or via a stock solution injection distributor. The injection method (Figure 8) is used.

Therefore, there is no loss of raw materials as seen in the runner and film gate (Figure 7).

By using the blast injection method and the above-mentioned mold tilting device, a new mold form forming method has been achieved in which the yield is significantly higher than that of conventional methods and the injection loss of raw materials is extremely small.

The actuation system of the mold tilting device may be a hydraulic or air cylinder, or an electric motor, as shown in FIG. Further, the inclination angle of the mold is controlled by adjusting a limit switch or the like.

It is preferable that the mold inclination start time be programmed and input into the control sequence of stock solution injection and mold operation so that it can be freely set.

Furthermore, in the present invention 14, the stock solution injection position #' into the mold
It is desirable to place the stock solution on the center line of the mold form product (Fig. 4 0.■). If the stock solution injection position is off the center line (Fig. 4 - Uniform filling is not achieved.

Further, if the molded product has a slit that intersects the center line, Ki, the injection position is preferably on the slit. (Fig. 4, 0.■) Depending on the height of the slit, if the injection position is removed from above the slit (Fig. 5, 0), the incidence of defects such as air pockets increases.

With a suitable injection position as described above, it is possible to reduce the design and manufacturing costs of the mold tilting device.

〔Example〕

Next, the present invention will be explained by examples.

A high-pressure foaming machine manufactured by Krauss Matsufei was used, and the injection conditions were a discharge rate of 5ooy/sec, an injection pressure, and a polyol of 100%.
Kg □2, incyanate 8 oJ/port 2, liquid temperature polyol and incyanate both 28° C., mold temperature 62° C., curing time 2 minutes, and the diameter of the cleaning piston α bottle of the high-pressure injection head was φ16 m. The molding conditions for each example and comparative example are shown in 1st *.

Example 1.2 The automobile seat cushions shown in Figs. 4A and BK were manufactured using the high-speed cure HR method using a mold tilting device as shown in Fig. 1 and a single point injection device as shown in Fig. 2. It was molded using the single point injection method under the conditions shown in Table 1.

The amount of stock solution injected was 1200y.

Example 3 Molding was carried out under the conditions shown in Table 1 using the injection method using the stock solution injection distributor as illustrated in FIGS. 8 and 6 in Example I.

Example 4 The automobile seat cushion shown in Fig. 5 was prepared using the high-speed cure HR method using the mold tilting device shown in Table 1 as shown in Fig. 2 using the single-point injection method shown in Fig. 2. It was molded under the following conditions. Injection ti110005'.

Example 5 In Example 4, molding was carried out under the conditions shown in Table 1 by the injection method using the stock solution injection distributor as shown in FIGS. 3 and 6.

Comparative Example 1 In Example 1, the mold tilting device was not used, and molding was carried out in the horizontal state as shown in FIG.

Comparative Example 2 In Example 8, the mold tilting device was not used and Ff? was maintained in the conventional horizontal state as shown in FIG. , typed.

Comparative Example 3 The mold tilting device was not used in Example 1, and the conventional seventh
It was molded in the horizontal state shown in the figure using an injection method using a runner and a film gate.

Comparative Example 4 In Example 1, the molded product was molded using the injection method using a runner and a film gate under the conditions shown in Table 1. Comparative Example 5 In Example 1, the one-point injection position was shifted from the center line of the molded product.

Comparative Example 6 Molding was carried out with the single point injection position shifted from above the slit in Example 1.

Table 1 (Molding conditions for manufacturing mold forms in Examples and Comparative Examples) Table 2 shows the molding results in Examples and Comparative Examples.

Table 2 (Number of samples for each: n=80) As is clear from the results in Table 2, the molding method of the present invention improves moldability, yield, and reduces the raw material loss rate due to the reduction of defects, compared to the conventional molding method. There has been significant technological progress compared to technology.

〔Effect of the invention〕

The effects of the present invention are summarized as follows.

(6) By using the mold form forming method of the present invention, by any method of injecting the stock solution,
Because the stock solution can be uniformly dispersed over the entire surface of the lower mold,
There are no defects such as air pockets or lack of thickness.

(b) The mold inclination device used in the present invention has a mold inclination angle,
Since the inclining start time and inclining speed can be freely and easily set, it is easy to adjust the conditions to the optimum conditions when molding a product of any shape.

(c) In the present invention, the stock solution is injected by direct single-point injection from a high-pressure injection head (Fig. 2) or stock solution injection via a stock solution injection distributor (Fig. 3). The loss of the undiluted solution is close to that of the atmosphere.

As described above, the present invention has made it possible to dramatically improve moldability, improve yield, and significantly reduce raw material loss.

[Brief explanation of the drawing]

FIG. 1A is a diagram of one embodiment of a single point injection method using a mold tilting device in each embodiment of the present invention, and FIG. 1B is a diagram showing a case where the mold tilting device is tilted in FIG. 1A. , Fig. 2 is a diagram of one embodiment of a single-point injection device, Fig. 3 is an installation diagram of an embodiment of a distributor for stock solution injection, and Fig. 4 A and B are product diagrams of Examples 1 to 3. 5A and B are product views of Examples 4 and 5, A is a front view showing the stock solution injection position (f), and B is a side view of the product. A side view, FIG. 6 is a drawing of an embodiment of the distributor for injecting a stock solution in Example 3.5, and FIG. 7 shows a mold form molding die equipped with a conventional runner for stock solution injection and a film gate. 1 High pressure injection head 2 Runner 3 Film gate 4 Upper mold 5 Lower mold 6 After mixer 7 Hinge 8 Upper mold mounting frame 9 Lower mold mounting frame 10 Hydraulic cylinder 11 Inlet tube Cleaning piston port Distributor for stock solution injection 14
Inlet port a, hc, self e, f, stock solution injection position Patent applicant Toyo Rubber Industries, Ltd. Figure 6 Construction 7 Figure 114 Figure A Lightning 4 Figure B g5 Figure 8 Go to g5 Figure 6 Procedural amendment ll (voluntary) Go 1 , Indication of the case 1986 Patent Application No. 210008 2, Name of the invention Mold form molding method 3, Person making the amendment Relationship to the case Patent applicant 4, Agent Address: 550 6, Contents of the amendment (1) ) Claims from page 1, line 4 to end of page 2 As shown in the attachment (2) Page 9, line 4, "automobile seat cushion" is corrected to "automobile seat cushion" Claim 1: Reaction injection molding In the molding of mode and foam by the RiM method (hereinafter referred to as the RiM method), a mold tilting device for pouring the undiluted solution is used, and the mold tilting device can be tilted arbitrarily within the range of 190 degrees to +90 degrees. Characteristic mold form forming method 0 2. A patent for mold form forming using the so-called high-speed cure HR method, which uses a high-pressure foaming machine and performs reaction injection molding on a temperature-controlled mold with a variable angle that has a good combination of high-speed reaction mixture. A mold form forming method according to claim 1. 3. In the RiM method, the mold form according to claim 1 or 2, in which the stock solution is injected into the mold from a high-pressure injection head via a direct single-point injection method or a stock solution injection distributor. Molding method. 4. Before starting to pour the stock solution into the mold using the mold tilting device,
Alternatively, the seven-fold form molding method according to claim 1, 2, or 3, wherein the mold tilting device is tilted after injection is started or after injection is completed. 5. Adjust the angle of the mold to 190 degrees to 6 with respect to the horizontal state of the metal.
A mold tilting device 6 that can freely set the mold tilting start time and tilting speed within a 90 degree range; If there is a slit that intersects with the center line, the slit is substantially on the slit, and the inclination direction of the mold is in the direction of the center line of the molded product. or Section 4 or Section 5
Mold Form Forming Method 0 Procedural Amendment (Method) % Formula % 2, Name of Invention Mold 7 Ohm Molding Method 3, Relationship with the Person Who Makes the Amendment (Patent Applicant) 6. Contents of the amendment, among the drawings attached to the specification,
One of them has been corrected to Figure 3 as shown in the attached drawing (copy). 7. Attached documents + l) 1 drawing (corrected Figure 3)

Claims (1)

[Claims] 1. In molding mode foam using the reaction injection molding method (hereinafter referred to as the RiM method), a mold tilting device is used during injection of the stock solution, and the mold tilting device is tilted between -90 degrees and +90 degrees. A mold form forming method characterized by freely inclining within a range. 2.Mold form is formed by the so-called high-speed cure HR method, which uses a high-pressure foaming machine and performs reaction injection molding on a temperature-controlled mold with a variable angle that has a good combination of high-speed reaction mixtures.Claim 1 Mold form forming method described. 3. In the RiM method, the mold form according to claim 1 or 2, in which the stock solution is injected into the mold from a high-pressure injection head via a direct single-point injection method or a stock solution injection distributor. Molding method. 4. Before starting to pour the stock solution into the mold using the mold tilting device,
Alternatively, the mold form forming method according to claim 1, 2, or 3, wherein the mold tilting device is tilted after injection is started or after injection is completed. 5. Adjust the angle of the mold from -90 degrees to +9 degrees with respect to the horizontal state of the mold.
Claim 1 or 2 or 3 or 4, which uses a mold tilting device that can freely set the mold tilting start time and the tilting speed within the range of 0 degrees. Mold forming method. 6. The position where the stock solution is injected into the mold is approximately on the center line of the molded product, and if there is a slit that crosses the center line of the product, it is approximately on the slit, and the inclination direction of the mold is The molding method according to claim 1 or 2 or 3 or 4 or 5, wherein the direction is the centerline direction of the molded foam product.