Another type is cast stainless steel submersible pumps, using precision casting, impeller is closed impeller, electrical motors for the dry, seal is double mechanical seal, is not the same motor. Cast stainless steel submersible pump is characterized by relatively strong, suitable for operations such as mine.
Stamping is not as strong, portable, lightweight body.Deep drawn parts is directed along the polymer in the polymer chain oriented in the direction of external forces, so as to improve the mechanical properties of polymer structure and a method. Stretching can be divided into two uniaxial and biaxial stretching, the former making chain oriented in one direction along which to chain orientation along the plane were ordered.
Deep drawn parts process is usually higher than the glass transition temperature under conditions of. Orientation of uniaxial and biaxial orientation of polymer produced can be made anisotropic (mechanical, optical, thermal, electrical, etc.), biaxial orientation to the direction of the plane is random molecular chain of. Crystalline polymer deep drawn parts deformation when the ball until the crystal can be damaged, partially folded chain lamellae pulled into straight-chain, under certain conditions can be structured and arranged along the deep drawn parts direction completely extended chain crystals.
Polymer formed during the stretching of this new structure, commonly referred to as actin crystal structure. In the process of its formation increased the number of straight segments, reducing the number of folded segments, while increasing the connection between lamellae chain, thereby increasing the mechanical strength and toughness of polymers.
Application of deep drawn parts pieces. Uniaxial tension is to increase the strength of chemical fiber an important means. Usually the ratio of fiber length after stretching to define the fiber of draw ratio. As the draw ratio increases, the fiber modulus and strength have increased. Hope in the spinning process to generate as much as possible straight-chain structure to making a high strength, high modulus synthetic fibers (such as polyamides fibers).
Film uniaxial tension parallel to the direction with the deep drawn parts strength with draw ratio increases. However, the direction perpendicular to the deep drawn parts strength of the fall and a high degree of uniaxial tension of polymer film can even lead to fibrillation. Therefore, it is also a method of manufacturing fiber. Biaxial stretching is to improve the performance of polymer film or sheet is an important way. Biaxial stretching can be used to prevent the uniaxial tension in the film plane direction perpendicular to the deep drawn parts strength variation of the shortcomings of biaxial deep drawn parts stretching of the product than those who did not have greater deep drawn parts strength and impact toughness . Therefore, the biaxial stretching of the film can be used for high performance requirements of base films and audio tapes, video tapes, etc. with base.