The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working cavity to achieve oil absorption and oil pressure. It is widely used in high pressure, large flow and occasions where the flow needs to be adjusted, such as hydraulic presses, construction machinery and ships. The main parts of the plunger pump include cylinder block, plunger, oil distribution plate, return plate, sliding shoe, ball joint, drive shaft, etc. There are many parts, complex processing procedures, and high requirements for processing accuracy and surface quality.

Definition of stamping die: A die is an industrial product that forms a material in a specific structural form in a certain way, and is also a production tool that can batch produce industrial product parts with certain shape and size requirements. The honorary title of "Mother of Industry", the types include stamping dies, plastic dies, casting dies, forging dies, powder metallurgy dies, rubber dies, inorganic material forming dies, etc. A special process equipment for processing metal or non-metal) into parts (or semi-finished products), called cold stamping die (commonly known as cold stamping die). This issue focuses on the processing solutions of automobile door panel stamping die.

The supporting structure of the smartphone, the mobile phone middle frame, is used to fix the mobile phone screen, back cover and internal components. The mobile phone middle frame material has high strength, hardness and good corrosion resistance. The commonly used materials for mid-to-high-end smartphones are stainless steel SUS304, SUS316L, aluminum alloy AL6063, AL7075 (aviation aluminum).

With the advancement and improvement of wind power technology, and more and more countries realizing the importance of sustainable energy, the wind power industry has experienced rapid growth under the strong support of the state. In 2019, my country's wind power renewable energy installed capacity continued to expand, wind power generation reached a new high, and the utilization level of wind power clean energy was improved. When the "13th Five-Year Plan" is coming to an end in 2020, my country will also usher in the high-quality and high-level development of renewable energy power.

With the improvement of the living standards of the Chinese people, more and more people have begun to pay attention to the beauty and health of their teeth, and the market related to dental implants and restorations is in the ascendant. There are three main types of tooth restoration methods: removable dentures, fixed dentures and dental implants.