The Hobby Injection Molding Machine That Wins Customers
2022/01/31 By hqt
Plastic Injection Machine Structure
Hobby injection molding machine basically structure as follows:
- Plastic injection machine construction
- Control and operation system.
- In the operation of the press machine is important and the control system.
- All models from low to high have this control system.
- The control system helps us to choose the operating plan for each type of plastic product, for each plastic line.
- The control system can fully automate by PLC or it can partially automate.
In this section, we only give an overview of the control system in the injection molding machine, but do not go into details.
Hobby injection molding machine mixing and liquefaction system
Mixing System Material mixing and liquefaction is the area that has the biggest influence on the plastic processing manufacturing technology process.
This system consists of the following main mechanical parts:
- Cylinder barrel of plastic extrusion machine
- Screw Plastic Extrusion Machine
- Heating Resistors
- Plastic input hopper
- Plastic Glue Splitting System
- Product forming mold system
- The plastic product forming system is the mold system.
Plastic injection mold system
Plastic molds come in many forms and complex structures.
For plastic products to be consistent and good or not depends a lot on the mold design and manufacturing stage. Hobby injection molding machine must achieve the following properties:
- Sample Standard Profile
- Materials Resistant to temperature, little known heat form
- The surface gloss of the mold must reach a high gloss
- Easily remove the product from the mold
- Mold surface hardness must be high, wear resistance.
- Design a cooling system for the mold to effectively dissipate heat during product cooling.
Injection molding support system
- Non-return Assembly
Clamping, Pushing Mold System in hobby injection molding machine:
Firstly, this is the system of Bracket, Clamp, and Push mold during machine operation. The main function is to open and close the mold.
Movable Mold Plate
Secondly, when the mold closes, the plastic will from the nozzle push the liquid plastic into the forming mold. Thirdly, come the stage of cooling the resin in the mold and finally, the operation of opening the mold to take the product out.
Mold Holder System Includes:
- The ejector assembly of the plastic injection machine (Machine ejectors).
This mechanism mainly designs as a Hydraulic Cylinder connected to an X-Section element.
- The mechanical assembly holds the mold on the hobby injection molding machine (Clamp cylinders).
This is the mechanical part that holds the mold on the frame of the press machine. Duties hold the mold firmly during pressing to ensure no pressure loss and product shaping.
- Moveable platen plastic injection mold parts.
Plastic injection mold for injection molding machine always has 2 parts, one part is stationary and one part is moving.
- Stationary platen plastic injection mold.
It is the Fixed Part on the mold holder. This Mold part just stands still and Shapes the product.
- Tie bars to guide plastic injection molds
However, guide sliders are Round steels, usually with 4 bars. On the Guide Slider will mount the parter. When the hobby injection molding machine opens and closes the mold, the mold pieces will slide on this bar to perform the opening and closing operation.
Operating Principle of Plastic Injection Machine
In this paragraph, the operating principle is as follows:
Plastic raw materials feed into the injection molding machine periodically. After the plasticizer injects into the mold, the shape of the mold will create the shape of the product.
Most importantly, after being shaped and cooled in the mold, the mold opening stroke is made to get the product.
The feature of hobby injection molding machine is that the production process takes place in cycles. The cycle time depends on the weight of the product, the temperature of the mold cooling water and the efficiency of the mold cooling system.
Injection molding Products
- shaping Product
- Quality checking
The quality and productivity of the product depends on the quality of the injection molding machine, the quality of the mold.
Installation and Alignment of Plastic Injection Machines
The installation and alignment of the plastic injection molding machine is a rather complicated job. Although the manufacturer has built a complete plastic injection machine, during transportation, each separate part must disassemble.
After transporting to the factory, we proceed to assemble the hobby injection molding machine. The important thing when Assembling and aligning the plastic injection machine is 4 Tie Bars.
This Guide should align with the center of the Mold. Letting During the slide stroke of the die do not cause these 4 bars to break.
Ensure accuracy in Plastic Molding products
In the process of plastic injection molding, errors will occur, affecting the quality and aesthetics of plastic products. This article will present you with a very basic and common error, which is the silver error, which means that the plastic injection molded product is discolored.
Discoloration, also known as silver core in hobby injection molding machine, is the phenomenon where the surface of plastic products appears silver gray streaks, like scratches. These streaks will distribute in the direction of the plastic flow, with the naked eye they will feel like plastic flakes.
The surface of the product is split into slabs and scales when cut across. Products with silver will be very susceptible to surface damage when exposed to hard objects.
The correct treatment direction
Moreover, this phenomenon causes the product’s appearance to be unsatisfactory and undesirable. Therefore, it is necessary to have the correct treatment direction through identifying the clear cause.
The cause of the silver error
Plastic is a type of chemical compound. When the plastic molecules encounter high temperature, they will slowly decompose. The higher the temperature, the higher the resolution will be. And the silver error in hobby injection molding machine appears as a result of bad gas resolution.
The injection pressure and injection speed will be higher
If the gate size design is small, the injection pressure and injection speed will be higher. The process of compressing the air in the press chamber will take place too quickly, causing pressure to roll back the air. Tiny air holes then form causing the silver fault.
Plastic powder is mixed with impurities that cause discoloration
In conclusion, some unwanted impurities for some objective reason will mix into the plastic, or some additive components mix in hobby injection molding machine. Such foreign substances are incompatible with thermoplastics, which can cause discoloration of the product.
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