The composition of the mold frame of the plastic gear mold

The structure of the plastic gear mold includes a mold holder. The mold frame is the skeleton of the whole plastic gear mold, and the parts of the plastic gear mold are fixed in the mold frame, and the mold frame bears all the loads in the injection molding process. And we Guangzhou OTEM engineering Plastics, in Guangzhou mold customization has more than 20 years of production and manufacturing experience, quality assurance, the following we introduce:

1. Upper fixing plate

The mother die side of the plastic gear mold of the plastic gear reduction box is fixed on the link plate on the injection molding machine table, and the glue feeding system is also installed

2. Stripping board

Also called the water plate, only the mold with a small water inlet has this plate, and the plastic gear mold of the plastic gear reduction box is basically a small water inlet, that is, a 3 plate mold. The function of the stripping plate is to peel off the water nozzle and the product, saving the time of manual stripping of the water nozzle

3. Parent template

Also known as the front template or A board, the master mold core is installed in the front template, the installation of the mold core space can be CNC digging frame can also be processed into a wire cutting frame

4. Common template

Also known as the rear template or B plate, is the installation of the male mold core parts, function and similar to the mother template

5. Bearing plate

Also known as the bracket, it is a part that carries or strengthens the bearing capacity of the mold to prevent the plastic gear mold of the plastic gear reduction box from deformation during the injection molding process. Some molds are very thick, with the bearing capacity of the bearing plate, the bearing plate is omitted

6. Partition board

Also called the square iron, while supporting the mold frame, it also leaves an ejection space

7. Upper and lower thimble plates

It is the part of the ejector system that installs the plastic gear mold, the thimble, and the return pin all rely on the upper and lower thimble plate to play a role

8. Lower fixing plate

The male die side of the plastic gear mold of the plastic gear reduction box is fixed on the link plate on the injection molding machine table, and the ejector system is also installed

Performance requirements for plastic gear mold cavities

1. Good machining performance.

2. High strength, good toughness.

3. Good spark machining performance.

4. Good wear resistance and fatigue resistance.

5. Strong chemical corrosion resistance.

What are the key points of plastic gear mold design?

1. Uniform wall thickness

The general wall thickness of plastic gear plastic parts is controlled at about 3mm, and the change range of wall thickness is required to be less than 25% for low-shrinkage materials, and less than 15% for high-shrinkage materials, that is, the main wall thickness is 3mm except for some non-important reinforcement. Because the thicker part does not condense quickly and shrink more than the thinner part, in order to prevent the plastic gear plastic parts from bending and deforming, the wall thickness is required to be uniform.

2. Avoid sharp corners where the two walls meet.

3. Set stiffeners

Reinforcing rib can enhance the rigidity of plastic gear, improve dimensional stability, control the plastic process during injection molding, reduce the weight of plastic gear to save raw materials, generally the height of reinforcing rib is 2.5-3 times the wall thickness, and the thickness is 0.5-0.75 times the main wall thickness. The small value of the rounded radius of the bar is generally 0.25 times the wall thickness, and the other side of the surface will be depressed when it is large, and the distance between the bar should be greater than twice the main wall thickness.

4, plastic gear rim - hub design

Simple plastic gear sheet structure, only one wall thickness, the thickness of the plastic gear should not exceed 6mm, when the plastic gear thickness is greater than 4.5mm, should be designed into the web and rim - hub structure, the thickness of the rim and web should be 1.25-3 times the thickness of the tooth.

Plastic gear mold maintenance

Plastic gear mold before, during and after the production of maintenance, Guangzhou mold customization We Guangzhou Aote Engineering Plastics Co., Ltd. in plastic gear mold processing has more than 20 years of experience, is a good choice.

1. Mold maintenance before production:

¢Ù Scrub the dust, oil and rust of the mold appearance, remove the dirt on the surface, and then the mold can be transferred to the injection molding machine.

¢Ú Clean the oil on the mold surface with an air gun or rag, stain remover or alcohol (alcohol for mirror mold).

¢Û Detect whether there is foreign matter in the cooling water channel of the mold to ensure that the water channel is smooth.

¢Ü Check whether the arc in the mold gate sleeve is damaged, whether there is residual foreign matter, if there must be cleaned up.

¢Ý The movement of moving parts must be checked whether it is smooth.

2. Mold maintenance in production

¢Ù Check and maintain the molds produced on the machine every day.

¢Ú Check whether the guide column, guide sleeve and slider of the mold are damaged or have foreign bodies on them, and refuel them once a day.

¢Û Clean the foreign matter and oil in the mold parting surface and exhaust tank, wipe and maintain it once a day with an air gun or rags, stain remover or alcohol.

3. Mold maintenance after production:

¢Ù Check whether each part of the mold is damaged.

¢Ú Clean the oil on the parting surface and the debris remaining in the mold cavity, spray on anti-rust oil.

¢Û Dry the remaining water in the cooling water channel