Metal forming methods are an important part of part design and a matter of great concern to manufacturers. Today, we will take you to explore the major metal forming processes: casting, plastic forming, machining, welding, powder metallurgy, metal injection molding, semi-solid metal forming, and 3D printing.

Common impurity elements in steel include phosphorus, sulfur, hydrogen, nitrogen and oxygen. Under normal circumstances, these elements have a detrimental effect on the properties of steel. However, some of them can play a beneficial role under specific conditions and become alloying elements.

Alloying elements in steel

Metal forming methods are an important part of part design and a matter of great concern to manufacturers. Today, we will take you to explore the major metal forming processes: casting, plastic forming, machining, welding, powder metallurgy, metal injection molding, semi-solid metal forming, and 3D printing.

There are many systematic errors that affect the dimensional variation of castings, including four main dimensional change factors: mold processing tolerance, wax pattern shrinkage, shell expansion, and alloy shrinkage. The basic physical shrinkage from mold to wax pattern and the solidification shrinkage of the casting are the two main reasons for the final dimensional variation of the casting. Research shows that in steel castings, the dimensional accuracy of the final casting is mainly transferred from the dimensional accuracy of its corresponding wax pattern.

The Dacromet coating process is a brand-new surface treatment technology, also known as Dacrol, Dacron, zinc chromate film, and Dacromet, etc. It was invented by Americans in the early 1970s and was transferred to MCI Company in the United States, DACRAL Company in France, and NDS Company in Japan around 1976. With the development of the global economy, environmental protection has increasingly become an important part of social economy and trade. In 1996, the former Ministry of Machinery Industry of China listed the Dacromet process as a key development project for clean production in the sustainable development of the machinery industry, which is a kind of "green electroplating". In industrialized countries, the Dacromet metal surface anti-corrosion technology has been adopted as an anti-corrosion treatment process to replace traditional processes such as electro-galvanizing, hot-dip galvanizing, electro-cadmium plating, zinc-based alloy plating, and phosphating, which cause serious pollution. This is a new process that fundamentally reduces environmental pollution.

17-4PH steel is a typical martensitic precipitation-hardening stainless steel, which has high strength and toughness as well as good corrosion resistance. After solution treatment at 1040℃, 17-4PH steel was subjected to single aging treatment at 480℃ and 550℃ respectively, and then to secondary aging at 550℃ after aging at 480℃. The mechanical properties and microstructure changes of the material under different heat treatment conditions were detected. The results show that the microstructure of 17-4PH steel after solution treatment and aging at 480℃ is martensite, while that after aging at 550℃ is tempered sorbite. The tensile strength and yield strength of 17-4PH steel are the highest when aged at 480℃, but the impact toughness is relatively low. With the increase of the single aging temperature, the strength of the steel decreases and the impact toughness increases when aged at 550℃. 17-4PH steel can obtain better comprehensive mechanical properties such as strength and impact toughness after solution treatment at 1040℃ and aging at 550℃.

The fit requirements of copper sleeves need to be determined based on specific application scenarios, load types, motion modes and working environments.

Characteristics of Magnesium Alloys and Advantages of Forging

For products like reducer housings that require structural complexity, geometric precision, lightweight design, and medium to small batch production (especially on the smaller side), lost foam casting offers a highly competitive solution. Its greatest value lies in the liberation of design freedom (integration of complex structures), improvement in manufacturing precision, and significant reduction in subsequent processing costs.

As a key component in mechanical transmission systems, the lifespan of gears directly affects the performance and reliability of the entire mechanical equipment. Shot peening, as a common surface strengthening process, can effectively improve the surface properties of gears. This paper deeply explores the influence mechanism of shot peening on the lifespan of gears, analyzes the correlations between shot peening process parameters, gear materials, working conditions and gear lifespan, and provides theoretical basis and practical guidance for the shot peening strengthening treatment and lifespan improvement of gears.

Using high manganese steel as the material, the filling and solidification process of the bucket tooth casting was numerically simulated by the casting simulation software ProCAST. The simulation results show that the filling time of the pouring system is relatively long and the filling temperature is relatively high, which leads to the formation of large shrinkage porosity inside the bucket tooth casting. The pouring process parameters and the pouring system were optimized and the numerical simulation was carried out. The results show that after the process optimization, the surface quality of the bucket tooth casting is good, the internal solidification speed is accelerated, the process defects are reduced, and the scrap rate is lowered.