JPH0355217A - Manufacture of urethane wheel - Google Patents

Abstract

PURPOSE:To improve operational efficiency by a method in which a check valve is inserted into an urethane-pouring hole, and then the inlet side of the check valve is connected to the feeding side, and its outlet side is connected to the side of an urethane-pouring hole, and next the resin in molten state is fed in a cavity through the check valve. CONSTITUTION:A pouring nozzle 3 is connected to the urethane-pouring hole 15 of a wheel 9, and the head 16 of a pouring machine is connected to a check valve body 1, and then the urethane resin in molten state is poured into the check valve body 1 from the head 16. Accordingly, the resin flows to exit part 5 from the connected part 4 of the check valve body 1, thereby pushing down the valve body 2. Consequently, the valve body 2 blocks the upper end of the pouring port 7 of the pouring nozzle 3, but since a notch 6 is provided on the valve body 2, the resin enters the pouring port 7 through the notch part 6 and enters a cavity 12. When the resin is foamed by generating chemical reaction, the valve body 2, is raised by its pressure, thereby blocking the exit part 5 of the cheek valve body 1. Consequently operational efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a 5-inch wheel to be attached to a wheel of an automobile or the like.

(Prior art) The wheels of my #1 car have a -i1K exterior design similar to that of the car body.
6, which is why automobile manufacturers pay close attention to the design of this part, aiming to achieve total beauty. However, for a 1t wheel, the design is valid for F:. It is the wheel part that closes, and it is usually not possible to have a noticeable design on the tire part. On the other hand, apart from the design, there is a brake mechanism that requires consideration of ventilation because it is located inside the wheel.

The ram or disc that directly exerts braking force converts running energy into heat energy to stop the vehicle, so the heat generated during braking must be dissipated to the outside. Must be. In this case, as mentioned above, the brake is on the inside of the wheel and has poor ventilation, so if a suitable hole is made in the wheel so that the wind can enter from here when driving, the brake mechanism This is extremely convenient in terms of cooling. When attempting to make ventilation holes in a wheel in this manner, there are naturally limitations in the conventionally commonly used sheet metal wheels due to their thickness and other factors. Therefore, wheels made of aluminum alloy, which must be strong and sufficiently thick, are used.

In this way, aluminum alloy wheels, which have recently become popular, require a certain degree of wall thickness for strength, so 2 ventilation holes can be drilled in any shape, which improves design. Although it can be said that it is excellent in terms of ventilation function, there is one problem. This means that they are significantly more expensive than sheet metal wheels. In other words, to obtain the same strength, a wheel made of sheet metal would require an extremely thin plate, whereas a wheel made of aluminum alloy would require the use of more material, resulting in higher costs.

In view of this point, the important parts of the wheel are made of sheet metal, and a layer of urethane (polyurethane) of an appropriate thickness is formed on the surface. For +Ril wheels, by applying arbitrary coloring to the tan resin, it is possible to obtain wheels that are comparable in appearance to aluminum alloy wheels, but are sufficiently inexpensive. A method for manufacturing this type of wheel (hereinafter referred to as urethane wheel) is disclosed in Japanese Patent Publication No. 52-17510.

The outline of the invention described in this publication is that a t! A sheet metal wheel formed by press molding is placed on top of this resin mold, and a cavity is formed between the lower surface of this wheel and the resin mold, and the -hi part of this wheel is A urethane resin layer in a molten state is formed on one surface of the 5 wheels by pressing with an upper mold and injecting molten urethane fat from the inside of the wheel into the cavity of the hole provided in the wheel. .

(Issue 8 to be solved by the invention) According to the method of the invention described in L, it is possible to reliably form a urethane resin layer on the surface of a temporary metal wheel, but this also has one problem. This is because when urethane stock solution is injected into the wheel from a high-pressure urethane injection machine, the stock solution undergoes a chemical reaction and foams, and this foaming pressure causes the solution to rise and leak.

In the past, in order to prevent this leakage, the head of the injection machine was pressed and held for a certain period of time (about 1 minute). For this reason, there was a problem in that the next injection operation could not be started during that time. The present invention has been made in view of this point.5 It is an object of the present invention to provide a method for manufacturing a urethane wheel that can prevent leakage without pressing the head by adding a simple mechanism. purpose.

(Means for Solving Problem R) The present invention provides a means for solving this problem by placing a resin mold having a predetermined shape on the upper part of a lower mold, and placing a sheet metal wheel formed by press molding on top of the resin mold. A cavity is formed between the lower surface of the wheel and the resin mold, and the upper part of the wheel is pressed by the upper mold to melt the urethane from the inside of the wheel through the urethane injection hole provided in the wheel toward the cavity. In a method for manufacturing a urethane wheel in which a urethane resin layer is formed on one surface of the wheel by injecting urethane resin, a reverse IL valve is interposed in the urethane injection hole, and the population of the check valve is reduced by 111 l. Connect the outlet 11111 to the urethane resin supply source side and the urethane iF manhole side, and connect the fa! ! k
This led to the development of a method for using urethane wheels, which is characterized by supplying resin in the same condition.

(Function) According to the above manufacturing method of the present invention, when molten urethane resin is injected into the cavity at high pressure, this resin passes through the inverted well toward the cavity, so that the raw solution foams due to chemical reaction. Even if it were to leak, it would be blocked by the check valve and would not overflow. (Example) Next, the method of the present invention will be explained with reference to the drawings. What is shown in FIG. 1 is an inverted doi main body l, a valve body 2, and an injection nozzle 3. The check valve body 1 is the head of the injection port (not shown in this figure)
It has a connecting port 4 and an outlet portion 5 communicating with the connecting port 4, and an injection nozzle 3 is screwed into the outer space of the outlet portion 5. The valve body 2 is located within this connecting portion 11+11 and is mounted so as to be movable up and down within the outlet portion 5. As shown in FIG. 2, this valve body 2 is a plate-shaped plate 6 with a plurality of notches 6 on its circular outer circumference, and is normally located below the outlet portion 5 as shown in FIG. IQ iff is applied onto the injection port 7 of the large injection nozzle 3. The resin that enters the inside of the reverse gutter valve body l from the head (not shown) pushes down the valve body 2, enters the injection port 7 through the notch 6, and is injected into the cavity. Figure 2 explains this work process. In this figure, the symbol 8 is the lower mold. A resin mold (resin mold) II having a predetermined shape 2, that is, a shape matching the rim 10 of the wheel 9, is placed on top of the lower mold 8. The first resin mold is number 6 in order to accurately position the wheel 9 without damaging it. Resin mold 11
A sheet metal wheel 9 formed by press molding is placed on top of the wheel 9. By @ffiing the wheel 9 in this manner, a cavity 12 is formed between the lower surface of the wheel 9 and the resin mold l1. An upper mold 13 is provided on the upper part of the wheel 9, and is tightened with the lower mold 8 by a guide post 14.

As shown in FIGS. 3 and 4, the wheel 9 is provided with a urethane injection hole 15, and a urethane injection nozzle 3 provided at the lower part of the check valve body t is connected to the urethane injection hole l5.
are combined. The coupling means is inset 7f-5iI! Any reasonable method is fine. As shown in FIG. 3, the injection nozzle 3 is connected to the urethane injection hole l5 of the wheel 9, and the head 16 of the injection port is connected to the reverse injection valve main body l. Then, molten urethane resin is injected from this head 15 into the reverse east valve main body l. In this way, the resin flows from the connection port 4 of the inverted 1L valve body l toward the outlet portion 5, and presses the valve body 2 downward. As a result, the valve body 2 closes the upper end of the injection port 7 of the injection nozzle 3, but since the valve body 2 is provided with a notch 6, rsb passes through this notch 6 and passes through the injection port 7. It will enter the cavity 12. When the resin undergoes a chemical reaction and foams, the pressure causes the valve body 2 to rise to a height L, thereby blocking the outlet portion 5 of the reverse IL valve body 1. If this part is occluded, the resin will not flow back into the check valve body, so there is no need to hold it down from above as in the past. It goes without saying that the depth of the notch 6 in the valve body 2 must be set appropriately in order to achieve this effect.
The urethane resin injected into the cavity 12 in this manner fills the cavity 12 and assumes a shape that matches the shape of the cavity 12. As a result, a wheel 9 having a urethane resin portion as shown by the reference numeral 17 in FIG. 4 can be obtained. (9: Light effect) Since the method of the present invention is purchased as described above, the molten uranium/tan resin injected into the two cavities is foamed by a chemical reaction, which is caused by the check valve. Since backflow is blocked by this, there is no leakage like in the conventional case. Since the check valve automatically drains the backflow, there is no need to hold it down and the next process can proceed in sequence, significantly improving work efficiency.

[Brief explanation of drawings]

FIG. 1 shows an inverted IJ used in the method of the present invention:. FIG. 2 is a plan view of the valve body in FIG. 1. FIG. 3 is a partially sectional side view for explaining the method of the present invention. FIG. A sectional view of the wheel alone in Figure 3,
Figure 5 is a front view of the completed urethane wheel. l...Check valve body 2...Valve body 3...Injection nozzle 5...Outlet section 6...Notch 7...Inlet port 8...Lower mold 9-・Wheel 1・...Resin mold 12...Cavity 13...Upper mold 15...Urethane injection hole L S-...Injection head 17...Urethane resin part 1 Figure 17...Urethane wJ layers @Figure 3

Claims (1)

[Claims] (1) Place a resin mold with a predetermined shape on top of the lower mold, place a sheet metal wheel formed by press molding on top of the resin mold, and create a cavity between the bottom surface of the wheel and the resin mold. The upper part of the wheel is pressed with an upper mold, and molten urethane resin is injected from the inside of the wheel through the urethane injection hole provided in the wheel toward the cavity, thereby forming a urethane resin layer on one side of the wheel. In the method for manufacturing a urethane wheel forming a urethane wheel, a check valve is interposed in the urethane injection hole, and the inlet side of the check valve is connected to the urethane resin supply source side, and the outlet side is connected to the urethane injection hole side. A method for manufacturing a urethane wheel, characterized in that a molten resin is supplied to the cavity through the check valve.