CNC machining of stainless steel precision parts for electrical communication equipment manufacturing solutions

Stainless steel subway vehicle body structure design: In stainless steel; subway vehicle; body structure design, the body is an important part of the subway vehicle, the overall safety, reliability, and performance of the vehicle are mainly dependent on the body structure to guarantee. At present, the urban subway vehicle body materials are ordinary steel (including weathering steel), stainless steel, and aluminum alloy 3 kinds of materials.

1, the stainless steel body structure of the main features

Stainless steel body with carbon steel body as the overall load-bearing plate and beam structure, caused by high strength, therefore, can achieve the light weight of the body structure, such as side walls and roof thickness of the outer plate generally take 1.0mm or 1.5mm, while the carbon steel body is generally not less than 2.0mm.

2, stainless steel subway vehicle body structure design points: body structure design, according to the different force characteristics to choose the appropriate material, not all materials are used stainless steel, must take into account other factors, such as the actual load-bearing and force situation, the general choice of fatigue resistance characteristics and good welding performance of low-alloy high-strength steel as the material of the bottom frame structure.

3. Underframe: The underframe of the car body is a structure without a center beam, mainly composed of the corrugated floor, side beam, one end module, two end modules, a crossbeam, and so on. Among them, the end module includes pillow beam composition, traction beam composition, buffer beam, cross beam, longitudinal beam, etc.

4. sidewall: sidewall consists of sidewall skeleton module, inner door column, crossbeam, door frame, etc. welded into a whole. The side walls are equipped with a certain number of mounting blocks, mounting beams, and wire ties on both sides, which are rigidly connected to the side wall steel structure and used to install door systems, guest room seats, inner wall panels, door columns, and alignment wires.

5. Roof: The roof is formed by roof beams, corrugated roof panels, and air conditioning flat roofs. The roof beam is mainly composed of the bent beam under the corrugated roof plate and the small bent beam under the side roof plate. The air conditioner flat roof is the installation position of the air conditioner, lap on the side roof plate and corrugated roof plate, considering the problem of preventing rain leakage, the lap joint is fully welded.

6. End wall: The end wall is composed of end corner pillars, door pillars, door crossbeams, door pillars, end wall panels, door end walls, bent beams, and other parts, and the end wall and side walls together form the support for the roof. The end wall plate is usually stamped with a bulb to improve its strength and stiffness.

7. Driver's compartment: The driver's compartment adopts the whole FRP structure with a steel skeleton, and is connected to the underframe, side walls, and roof of the car. The bolt connection between FRP outer cover steel structure skeleton and FRP outer cover.

SUS301L series stainless steel in the lightweight urban rail body solutions: SUS301L stainless steel; lightweight; urban rail body; selection of materials

1. SUS301L stainless steel material performance analysis: applicable to the body of the stainless steel material should have four conditions: high strength, small thickness, good welding performance, and easy cold processing. The first two are the basic conditions for the lightweight body, the latter two are necessary for the processing and forming of the body structure. SUS301L austenitic stainless steel is a special stainless steel material for vehicles, analysis of its various material properties, processing performance, and the interrelationship between the body structure, can provide a theoretical basis for the lightweight body through the selection of materials.

2. Chemical composition and corrosion resistance: stainless steel can be widely used in the body of the premise to have excellent corrosion resistance, so that in the design of the body structure of the plate thickness, no longer need to leave a corrosion margin like weathering steel. The corrosion resistance of stainless steel is often determined by its chemical composition.

3. Physical properties and weldability: In austenitic, martensitic, and ferritic, the three typical stainless steel, austenitic stainless steel welding performance is the best. However, its welding performance, especially arc welding performance, compared with other car body materials is still a big gap, which is mainly subject to the following two physical properties:

1, the coefficient of thermal expansion is large. The coefficient of thermal expansion of stainless steel materials is about times that of carbon steel, making the same heat when welding its deformation than ordinary steel deformation is much larger.

2, the thermal conductivity is low, about 1/3 of carbon steel. so the heat generated by welding can not be quickly dispersed, a large amount of heat is gathered in the weld area. The austenite organization of stainless steel is unstable at high temperatures, at 500 ℃ ~ 800 ℃, the carbide of Cr in steel will precipitate along the grain boundaries, making the grain boundaries near the grain boundaries due to the decline in the amount of Cr and grain boundary corrosion, while the yield strength and tensile strength will drop sharply.

Packing: Inner is Poly foam, out is carton. Then pallet. Carton size: 29*19*19.5CM and 23.5*17.5*8, CM and pallet size is: 215*100*90CM, or as your requirement.

Packaging & Delivery and Packaging Details

1. Shrink film+wooden box

2. Cardboard box+pallet

3. Color box

4. As per the customer's request