Процес производње АИА причвршћивача - термичка обрада.

AYA® fastener serves customers in the automotive, machinery, industrial engineering, railway and aviation industries worldwide.

AYA® fastener production process is mainly composed of 6 steps: raw material restructuring, semi-finished part, heat treatment, assembly, surface treatment and packing design. The production process of fasteners is as follows:

Термичка обрада челика углавном укључује жарење, нормализацију, каљење и каљење, загревање, очување топлоте, хлађење у одређеном медијуму, то је процес контроле перформанси дела променом површине или унутрашње структуре металног материјала.

The main purpose of heat treatment after cold heading forming of fasteners is to obtain good mechanical property by quenching and tempering. Heat the steel to the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel) above the temperature (30 50 degree ), and hold for a period of time. Heating temperature and holding time are the key factors for quenching. When define the initial cooling temperature of quenching, factors such as carbon content, alloy elements, workpiece size and shape, heating mode, quenching medium and original structure should be considered comprehensively. Holding time includes the heating time, diathermanous time and organizational transformation time. The length of holding time is related to the amount of furnace, furnace type, workpiece size, steel composition and technical requirements. Commonly used quenching cooling media is water, oil, molten salt and molten alkali, etc.

Tempering heat treatment is to heat quenched parts to appropriate temperature below the lower critical temperature Ac1 and cooled to room temperature in the medium such as air or water or oil after holding for a period of time.

According to the different performance requirements of the workpiece, tempering temperature is different,it can be divided into the following kinds of tempering:

1. Low temperature tempering (150-250 degree ), the  internal structure obtained by low temperature tempering is tempered martensite. Its purpose is to reduce the quenching stress and brittleness of hardened steel on the premise of maintaining its high hardness and high wear resistance, so as to avoid cracking or premature damage during use.

2. Tempering at medium temperature (350-500 degree ), the internal structure obtained by tempering at medium temperature is tempered troostite. The purpose is to obtain high yield strength, elastic limit and high toughness.

3. High temperature tempering (500-650 degree ), high temperature tempering of internal structure istempered sorbite. Generally, the heat treatment combined with quenching and tempering is called quenching and tempering. Its purpose is to obtain good comprehensive mechanical properties of strength, hardness, plasticity and toughness. The purpose of tempering is to eliminate or reduce stress, prevent deformation or cracking; Stable structure, stable shape and size, ensure accuracy; Adjust strength, hardness, plasticity, toughness and other mechanical properties.

Аутор: Хебе Хан

Хебеи Синостар Традинг Цо., Лтд. One-stop building materials, hardware and home furniture sourcing solutions provider. Our main products including: Roofing Sheet, Metal Pipe, Wire and Mesh, Fence and Gate, Fittings and Valves, Причвршћивач and Сцрев,  Iron  Art,  Scaffolding,  Iron  Nail, Folding  Chair, Living  Room  Furniture, Dining  Room  Furniture, Storage  Shelf, Outdoor  Furniture , Storage , Metal Tools, and other steel products.

When you decide to buy АИА Фастенерс you must choose the right product according to your actual needs to avoid unnecessary losses due to the wrong choice. If you want more information, please contact  Hebei Sinostar for the details.