In plastic injection molds, gearbox, rack and pinion is one of the common mechanisms that are used to control the movement and opening and closing of different parts of the mold (usually moving plates or part exit system). This system is used to move plates or parts of the mold simultaneously and uniformly. Below is a complete description of this system:
The main components of the wheel and shoulder:
1. Pinion:
• It is usually connected to a motor or actuator that transmits rotational force to the system.
2. Shoulder (Rack):
• It is a linear rod that has teeth that mesh with the gear teeth.
• It converts the rotary motion of the gear into linear motion.
Application of wheel and comb in gearbox injection molds:
1. Simultaneous movement of pages:
• In multi-plate molds or molds with a complex open and closed system, a wheel and shoulder are used to keep the plates aligned.
• This mechanism ensures that the plates move uniformly and without deviation.
2. Part exit:
• In some molds, the wheel and comb are used to remove parts from the cavities (Cavity).
• This system makes the removal system work directly and uniformly.
3. Movement of auxiliary mechanisms:
• Wheels and combs can be used to move mechanisms such as slides or mold side systems.
Advantages:
1. High precision: precise and uniform linear movement.
2. Control ability: easy adjustment of the movement by changing the ratio of teeth.
3. High durability: if resistant materials are used, the system is durable. Suitable for moving heavy parts and high load bearing.
Disadvantages:
1. Manufacturing cost: The design and production of this system requires high precision, which is costly.
2. Wear: If the wrong materials are chosen or the lubrication is not done properly, the wear of the teeth can become a problem.
3. Speed limitation: The possible movement speed. It is limited compared to some other mechanisms.
Design and maintenance tips:
1. Choosing the right materials:
• To increase durability, gears and comb are made of resistant materials such as hardened steel or wear-resistant alloys.
2. Lubrication:
• Proper lubrication is essential to prevent wear and reduce friction.
3. Alignment of the system:
• During installation, it must be ensured that the gear and comb are properly engaged to avoid any deviation or wear.