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The decisive methods for the height of the water outlet position beside the mold housing, the damage and deformation of the front mold cavity

• 2025-08-28

The decisive methods for the height of the water outlet position beside the mold housing, the damage and deformation of the front mold cavity

The water outlet position of the mold's casing is raised at the top

Phenomenon: At the top, close to the gate entry point, there are many deep-angled bone positions, with only one inclined top protruding and one touch perforation.

Characteristics of injection molding machines

Grade: Haitian, Clamping force :140, Plasticizing capacity :133g

(2) Mold characteristics

Mold ejection number :1×1, glue injection method: point gate, ejection method: push plate ejection, mold temperature: 85℃ (constant temperature machine)

(3) Product characteristics

Material: PC, Color: Gray, Product weight (single piece) : 16g, nozzle weight: 10g

(4) Analysis of causes of defects

1.There is a glue entry point at the top, and the injection molding is relatively full. Moreover, there are multiple deep-angled bone positions on the inner wall of this part, which are quite large

Adhesive force.

2. At the top, there is only one inclined thimper protruding over a larger area, and the position of the thimper is not at the most stressed point. This

The ejection force is far less than the adhesive force generated by the deep-angled bone position on the inner wall at the top, thus causing the top to rise.

3. There is a polygonal structural impact hole at the top, which also has a considerable adhesive force and creates an opportunity for the top height.

(5) Countermeasures

1. Move the position of the glue entry point at the top.

2. Add a page needle to the deep corner bone position at the top to assist in ejection, and at the same time polish the deep corner bone position to increase the demolding degree and reduce the bone 

The adhesive force of the mold should be removed to avoid being pushed up.

3. Polish the inserts at the punched holes to increase the demolding degree and reduce the adhesive force during ejection.

Bumper Mould Manufacturer in China (jfmoulds.com)

The front cavity of the mold was damaged

Characteristics of injection molding machines

Grade: DEMAG, clamping force: 100t, plasticizing capacity: 133g

(2) Mold characteristics

Mold ejection number :1×2, glue injection method: direct injection, ejection method: push plate ejection, mold temperature: 75℃ (constant temperature machine)

(3) Product characteristics

Material :ABS+PC, Color: Black, product weight (single piece) : 3g, nozzle weight :6g

(4) Analysis of causes of defects

1. The small water outlet ejector pin was not made to be inverted. After being pushed out, the small water outlet automatically dropped or flew around, falling into the inclined top hole.

Without the operator's clear understanding, after the mold was closed, the small water outlet fell into the inclined top hole. After the inclined top was retracted, it could not be retracted into place.

It protruded above the mold surface, causing damage to the front mold.

2. The low-voltage mold locking calibration is unreasonable.

(5) Countermeasures

Make an inverted connection on the small water needle to ensure that the small water outlet can be fixed on the ejection needle after ejection and will not fall into the inclined top hole.

2. Enhance the sense of responsibility of the operators. After the mold is opened and ejected, pay attention to the direction or retrieval of the small water outlet, and ensure safety in production

Consciousness.

Commodity Mould_Taizhou Jiefeng Mould Co.,Ltd. (jfmoulds.com)

Mold deformation

Phenomenon: The battery casing of communication products may warp and deform during the production process.

Analysis: Steel sheets are inserted into the mold, and uneven shrinkage occurs after injection molding and demolding, resulting in warping deformation. The release of internal stress in the product causes deformation.

Characteristics of injection molding machines

Grade: HT-DEMAG, clamping force :100t, plasticizing capacity: 90g

(2) Mold characteristics

Mold ejection number :1×2, glue entry method: lap water outlet, ejection method: Ejection with ejector pins, mold temperature: 80℃/100 ℃(Constant temperature machine）

(3) Product characteristics

Material :ABS+PC, Color: Black, Product weight (single piece) : 1.5g, nozzle weight: 11.29

(4) Analysis of causes of defects

The mold's glue inlet method is four-point lap glue inlet. Due to the 0.6mm thickness of the product's glue position, it is difficult to fill and pass the glue, and there is internal adhesion within the product

The force is large, and the uneven shrinkage of the steel sheet embedded in the mold after injection molding leads to warping and deformation of the product.

(5) Countermeasures

1. Adjust the temperature difference between the molds before and after.

2. Adjust and increase the temperature of the barrel.

3. Adjust multi-stage injection molding and multi-stage gradual pressure reduction holding.