Essential Quality Control Checks for Injection Moulding

Injection molding parts are used in many fields of life. If your company has new products to develop, you may need to find a suitable injection molding products manufacturer.

Quality must be your most concerned issue, the key quality factors are dimension and appearance.

Factors related to the size of injection molding products.

1.The shrinkage rate of plastics. The shrinkage rate of each plastic material is different. It is necessary to confirm the shrinkage rate of the mold before starting to design the mold. In HanKing Mould, engineers are very experienced in the shrinkage rate of plastics, but it is still stipulated they must refer to the specifications of the plastic material brand. Once the wrong shrinkage is used, the product will be too large or too small, so it is very important to choose a reliable injection molding company.

2. Tolerance of plastic products, when you define tolerance standards for some important size of your plastic parts, if the size exceeds this tolerance range, it is a quality problem. But the tolerance value is not as small as possible, because the more precise the size, the higher the cost. Therefore, in consideration of cost control, we recommend that you set an appropriate tolerance range. It does not matter if you do not provide the tolerance range, we will control the size quality for you in accordance with international standards. If your product is a precision plastic part, there is high quality requirements for dimension, as a manufacturer with high-precision mold making and injection molding machines, HanKing mould will realize your products perfectly.

How to detect the size of plastic components.

In order to ensure the accuracy of the dimension inspection results, we need to use some quality inspectoin tools. At HANKING MOULD, the commonly used inspection tools include electronic scale, caliper, micrometer, height gauge, pin gauge, feeler gauge, and Rockwell hardness tester, and we also have anime and three-dimensional precision measuring instruments.

Anime is a non-contact measuring instrument with high performance and high precision. Anime transmits the captured image to the data acquisition card of the computer through the data line through projection, and then the software images on the computer display; It can be used to measure various geometric elements on the part, and it can also be used to describe the outline in 2D and output it in CAD. Not only the contour of the workpiece can be observed, but also the surface shape of the opaque workpiece can be measured.

Three-dimensional element is characterized by high accuracy (achievable μ M level); can replace various length measuring instruments; As long as the three-dimensional probe can touch the place, its geometric size, mutual position and surface profile can be measured; And complete data processing with the help of computer; HanKing Mould uses ZEISS CMM, which has become an important tool for quality assurance with its high accuracy, high flexibility and excellent digital capabilities.

Essential quality control checks for injection moulding include appearance inspection, it is necessary to clarify the customer's requirements and drawing requirements, and make an inspection standard for each plastic product. The QC shall inspect the products according to the inspection standard. During injection molding production, it is necessary to compare with the previously retained samples to confirm that the produced part color is the same, and we need check if the plastic part structure is correct, no flash, spot, bubble, deformation, etc.