Cooling System Design Affects Mass Production Stability

Cooling System Design Affects Mass Production Stability

2025-10-16

Refined Matching Principle of Stitch Pitch and Tension

Refined Matching Principle of Stitch Pitch and Tension

The quality of the stitch in leather sewing depends on the coordination of parameters: for thick leather (thickness > 2mm), a size 14 sewing needle matched with 402 nylon thread should be used, and the stitch pitch should be controlled within 3 stitches per 3cm; for soft leather, a size 9 round-tip needle is selected, and the presser foot pressure is adjusted below 0.3MPa. The key control point is that backstitching of 3-5 stitches is required at the start and end of sewing. The thread tension is calibrated through test sewing—when pulling the thread, the stitches should not shift and the leather should not wrinkle. This can increase the seam breaking strength to over 50N.

2025-10-16

New Breakthrough in Positive-Negative Pressure Combined Molding for Thick-Sheet Products

New Breakthrough in Positive-Negative Pressure Combined Molding for Thick-Sheet Products

2025-10-16

Three-Stage Temperature Control Solves Melt Fracture Problems

Three-Stage Temperature Control Solves Melt Fracture Problems

2025-10-16

Impurity Control is Key to Dimensional Accuracy

Impurity Control is Key to Dimensional Accuracy

The content of impurities such as iron, lead, and cadmium in zinc alloy die casting directly affects product quality. Industry data shows that when the iron content exceeds 0.02%, hard spots are likely to form, causing processing difficulties; while excessive lead and cadmium can lead to surface blistering after storage. The solution must start from the source: select high-purity zinc raw materials with a purity of over 99.99%, control the ratio of new materials to recycled materials not to exceed 7:3, and strictly keep the remelting temperature below 420°C. These measures can effectively reduce impurity interference and stabilize the dimensional tolerance within ±0.1mm.

2025-10-16

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