③． CNC数控下料，NC下料时首先要编写数控加工程式，利用编程软件，将绘制的展开图编写成NC数拉加工机床可识别的程式，让其根据这些程式一步一刀在平板上冲裁各构形状平板件，但其结构 受刀具结构所至，成本低，精度于0.15。
1, the establishment, implementation and maintenance of environmental management system, sheet metal processing based on the impact of the company activities, products and services on the environment, to formulate, promote and review environmental objectives and indicators;
2, strictly abide by national and local environmental laws and regulations and other requirements.
3, implement cleaner production, and do well in energy conservation, consumption reduction, emission reduction, pollution prevention and continuous improvement.
4, carry out environmental education activities to improve the awareness and ability of environmental protection.
5, cooperate with relevant parties to create a better environment.
The difference of sheet metal structure and process can be different, but the total number of sheet metal parts is not more than the following points:
1. Blanking: there are various ways of cutting materials, mainly in the following ways:
Scissors: it is a simple sheet metal sheet metal cutting with cutting bed cutting material. It is mainly prepared for die blanking forming, the cost is low, the precision is less than 0.2, but it can only be processed without holes and no cutting corners of the strip or block material.
(2). Punching machine: it is a kind of shape material that can be blanked out by one or more steps on the plate. The advantage is that it takes short time, high efficiency, high precision and low cost, and it is suitable for mass production, but it is necessary to design a mold.
(3).CNC numerical control blanking, NC is the first to write the numerical control process program, using the programming software, the drawing of the expansion map is written into the NC number drawing machine tool can be identified, so that the program according to these programs one step on the flat plate blanking on the flat plate, but its structure is subject to the tool structure, low cost, precision At 0.15.
(4). Laser cutting is used to cut the structure of the flat plate on a large plate by laser cutting. It needs to write a laser program like the NC material. It can lower the complex shape of the flat plate, and the cost is high and the precision is in the 0.1..
Sawing machine: mainly use lower aluminum profile, square tube, picture tube, round bar material and so on, with low cost and low precision.
2. fitter: deep hole, tapping, reaming, drill hole sinking angle generally 120 degrees, for pulling rivet, 90 degrees for countersunk screw, tapping the British bottom hole.
3. flanging: also called hole and hole, that is to draw a slightly larger hole on a smaller base hole, and then tapping, mainly using sheet metal processing with thin plate thickness, increasing its strength and number of threads to avoid sliding teeth, generally used for thin plate thickness, and the shallow flanging of the hole Zhou Zhengchang, the thickness is basically unchanged, allowing thickness to be thick. When the degree of 30-40% is thinner, the height of 40-60% higher than the normal flanging height can be obtained. The maximum flanging height can be obtained when it is thinned by 50%. When the thickness of the plate is larger, the thickness of the plate, such as 2, 2.5, etc., can be tapped directly.
4. punching machine: using die forming process, the general punching machine has punching, cutting angle, blanking, punching bulge (Bump), punching and tearing, drawing holes, forming and other processing methods. Its processing needs corresponding die to complete operation, such as punching die, punch die, tearing die, drawing die, molding mould, etc. Pay attention to the position and direction.
5. pressure rivet: pressure riveting on the company, the main pressure riveting nuts, screws, loose and so on, it is through the hydraulic pressure riveting machine or punch to complete the operation, it is riveted to sheet metal parts, there is also rising riveting way, need to pay attention to the direction.
6. bending; bending is to fold the 2D flat parts into D parts. Its processing requires a folding bed and a corresponding bending die. It also has a certain bending order. The principle is that the next knife does not interfere with the first fold, resulting in a back break of interference.
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