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Ⅲ.

Explanation of Molding

・

Extrusion molding

Extrusion molding is used for plain plastic parts, such as plastic sticks and boards. A plastic stick

is made through pressing out the melted plastic from a round opening. The board is made through

a thin flat opening. Changing the shape of the opening, various kinds of plastic can be made.

The section deciding the shape is called a die. It can be compared to a tube of toothpaste. The

mouth of the tube is a die and toothpaste is melted plastic. If the mouth of the tube had a star

shape, you could squeeze out star shaped toothpaste. The star shaped plastic can be produced

in the same way.

・

Blow molding

Blow molding is for making hollow objects, such as a plastic bottle. The outer surface of the bot-

tle could be formed with injection molding but inner space cannot be made. To make the hollow,

the mold for making the inside wall would be needed, but it could not be taken out from the inside

of the plastic bottle. The blow molding uses air to make the inside hollow. The melted plastic in a

form of a balloon will be placed between the molds, and air will be blown inside. Then, the plastic

bottle is made when it cools and becomes solid. 

There are also other molding methods, such as vacuum molding and foam molding.

・

Extrusion molding

Roller

Refrigerated water

Motor

Die : Shapes the plastic.

・

Blow molding

Balloon shaped plastic

Blow air

Completed

Mold

Ⅲ.

Explanation of Molding

Ⅲ. Explanation of Molding

The robot has many plastic parts for its body and the controller. There are many plastic

products around you also. When you compare the same plastic parts from the same products,

you can see they have exactly the same form. Otherwise, the parts could not fit with the

matching parts or the products would have uneven quality. Then, how are these plastic parts

are made to be same? The technique called “molding” is used to make the plastic parts.

There are many ways to mold the plastic.

・

Injection molding

Injection molding needs more than two pieces of metallic molds. The mold is processed with

tools for cutting, holing and making posts to shape an exactly opposite surface to the plastic

part, which will be molded. 

When the molds are fitted together, there will be opening inside made from the above carving

process, and the melted plastic will be injected there. The plastic will be taken out from the

molds after it cools down and becomes solid. In this way, plastic parts are produced to have

the same shape.

It is similar to making waffles. The mold is a waffle iron and the melted plastic is batter, so that

the completed plastic parts will be waffles. 

The injection molding is used to make the plastic with a rather complicated shape, such as the

parts used for this robot.

1. Molding Procedure

●

Various ways of molding

・

Injection molding

The heaters will melt
the plastic.

Screw
Pressing out the melted plastic.

Hopper
Small pieces of plastic are inside.

Mold

The melted plastic will be injected

Motor

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*MR-9003E  3.7.30 1:47 PM  ページ 28

Содержание MR-9003E

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Страница 5: ...t Nut 3pcs Battery contact for PCB 3pcs The side with the slot 4 Assembly of Controller Assembly of Mechanical Parts e e h h h h h h e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e...

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Страница 12: ...hole Put in small cut up pieces of rubber bands Ping pong table Install fences around the table Goal Goal Make many other creative and fun games and rules How to operate Forward Left rotation Right ro...

Страница 13: ...printed circuit board through which the electric current can pass When the switch on the controller is pushed the switch contact inside is also pushed in and makes a path for the electricity to run th...

Страница 14: ...I 6K O2 0Y V4 6K O2 0M I4 6K O2 M I4 6K O2 0Y I4 6K O2 0M I4 6K O2 0M I4 6KhO2 0M I4 0M I4 0M O2 6K O2 6K O2 6K O2 6K O2 6K O2 6K W2 6X O K W2 6X W X O K W2 6Xhg W X hf W Xhf W X he W Xhe W X h 7 1 h...

Страница 15: ...ted Mold Explanation of Molding Explanation of Molding The robot has many plastic parts for its body and the controller There are many plastic products around you also When you compare the same plasti...

Страница 16: ...he gate Melted plastic was poured in here Parting line The part where the molds meet Gate Parting line Explanation of Molding Weld line As explained in the previous pages the molds have the shape exac...

Страница 17: ...heating and pressurization and it is removed synthesized synthetic rubber synthetic fiber synthetic leather and called as synthetic resin It sounds like difficult doesn t it Let s explain about plast...

Страница 18: ...them by heat and chemicals These could be other products later Recently package of the products show material of plastic to distinguish each material easily Recently a gift box has a printing of plast...

Страница 19: ...nd vinyl wire might be cut sometimes PCB solves this problem as well You may hard to find the electric machines that is without a circuit board However circuit board has some electricity to avoid elec...

Страница 20: ...er film is that copper made as very flatten and it is the part that let electricity through The board has the copper film only one side is called one sided PCB both side is called double sided PCB bot...

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