Hot Forged Trailer Accessories

The initial recrystallization temperature of steel is about 727°C, but 800°C is generally used as the dividing line, and the temperature above 800°C is hot forging; between 300 and 800°C, it is called warm forging or semi-hot forging, and forging is performed at room temperature. is called cold forging.

Forgings used in most industries are hot forging. Warm and cold forging are mainly used for forging parts such as automobiles and general machinery. Warm and cold forging can effectively save materials.

Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is an enterprise specializing in forging, processing and production of forgings. Products can be produced according to drawings and chemical compositions, and the integration of free forging, die forging, rough machining, heat treatment and finishing is completed. Long-term cooperation with crane, petroleum, chemical, mining, metallurgy, hydraulic, coking, train, construction machinery and other enterprises.

Product Dsecription

1. Implementation standards: the company strictly implements ISO9001, ISO14001, IATF16949 certification

The products have passed the certification of ROHS, FDA EU, etc.

2. Product material standards: ISO, GB, ASTM, SAE, EN, DIN, BS, AMS, JIS, ASME, DMS, TOCT, GB

3. Main process: cold forging, hot forging, free forging, fetal membrane forging, die forging and special die forging. And has die casting process, investment casting, shell casting, deburring, sand blasting, machining, heat treatment, leak testing, surface treatment, etc.

4. Hot Forged Trailer Accessories Available Materials:

Copper, titanium alloy, high manganese steel, high chromium steel, high nickel steel, carbon steel, aluminum alloy, alloy steel, stainless steel, gray iron, cast iron, cast steel, etc. are customized according to customer requirements.

Materials for Hot Forged Trailer Accessories

Forging materials are mainly carbon steel and alloy steel of various compositions, followed by aluminum, magnesium, copper, titanium, etc. and their alloys. The raw state of the material is bar, ingot, metal powder and liquid metal. The ratio of the cross-sectional area of the metal before deformation to the cross-sectional area after deformation is called the forging ratio. The correct selection of forging ratio, reasonable heating temperature and holding time, reasonable initial forging temperature and final forging temperature, reasonable deformation amount and deformation speed have a lot to do with improving product quality and reducing costs.

Generally, small and medium-sized forgings use round or square bars as blanks. The grain structure and mechanical properties of the bar are uniform and good, the shape and size are accurate, and the surface quality is good, which is convenient for mass production. As long as the heating temperature and deformation conditions are reasonably controlled, forgings with excellent performance can be forged without large forging deformation.

Ingots are only used for large forgings. The ingot is an as-cast structure with large columnar crystals and a loose center. Therefore, it is necessary to break the columnar crystals into fine grains through large plastic deformation and compact them loosely to obtain excellent metal structure and mechanical properties.

The powder metallurgy preforms that have been pressed and sintered can be made into powder forgings by forging without flash in the hot state. The forging powder is close to the density of general die forgings, has good mechanical properties, and has high precision, which can reduce subsequent cutting operations. Powder forgings have uniform internal structure and no segregation, and can be used to manufacture small gears and other workpieces. However, the price of powder is much higher than that of general bars, and its application in production is limited.

Applying static pressure to the liquid metal poured in the die cavity makes it solidify, crystallize, flow, plastically deform and form under the action of pressure, and then die forgings with the desired shape and properties can be obtained. Liquid metal die forging is a forming method between die casting and die forging, and is especially suitable for complex thin-walled parts that are difficult to form in general die forging.

In addition to the usual materials, such as carbon steel and alloy steel of various compositions, followed by aluminum, magnesium, copper, titanium, etc. and their alloys, iron-based superalloys, nickel-based superalloys, and cobalt-based superalloys The deformed alloys are also completed by forging or rolling, but these alloys are relatively difficult to forge due to their relatively narrow plastic zone. Different materials have strict requirements on heating temperature, opening temperature and final forging temperature.

Process Flow

Different forging methods have different processes. Among them, the process of hot die forging is the longest, and the general order is: blanking of forging billet; heating of forging billet; roll forging preparation billet; die forging forming; trimming; punching; straightening; Intermediate inspection to check the size and surface defects of forgings; heat treatment of forgings to eliminate forging stress and improve metal cutting performance; cleaning, mainly to remove surface oxide scale; correction; It must undergo chemical composition analysis, mechanical properties, residual stress and other inspections and non-destructive testing.

Forging Features

Compared with castings, the metal structure and mechanical properties can be improved after forging. After the casting structure is deformed by the forging method, due to the deformation and recrystallization of the metal, the original coarse dendrites and columnar grains become an equiaxed recrystallized structure with finer grains and uniform size, which makes the original segregation and recrystallization in the steel ingot. Porosity, pores, slag inclusions, etc. are compacted and welded, and the organization becomes more compact, which improves the plasticity and mechanical properties of the metal.

The mechanical properties of castings are lower than those of forgings of the same material. In addition, the forging process can ensure the continuity of the metal fiber structure, so that the fiber structure of the forging is consistent with the shape of the forging, and the metal streamline is complete, which can ensure the parts have good mechanical properties and long service life. Precision die forging and cold extrusion are used. Forgings produced by processes such as warm extrusion and warm extrusion are incomparable to castings.

A forging is an object to which a metal is subjected to pressure to shape the desired shape or suitable compressive force through plastic deformation. This force is typically achieved through the use of a hammer or pressure. The forging process builds a refined grain structure and improves the physical properties of the metal. In real-world use of the component, a proper design enables particle flow in the direction of the main pressure. Castings are metal forming objects obtained by various casting methods, that is, the smelted liquid metal is injected into the pre-prepared casting mold by pouring, injection, suction or other casting methods, and after cooling, it is subjected to falling sand, cleaning and post-processing. Processing, etc., the resulting objects of certain shape, size and properties.

Post Casting Process

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;

3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam)

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;

4. Provide after-sales service.