Pneumatic Sheet Metal Shearing/Cutting Machine
Synopsis:
该项目的目的是准备一台机器，该机器在不努力的情况下剪裁金属，但可动时地运行。压缩空气用作工作媒体。压缩空气移动机器的叶片以切割金属薄板。
该项目的想法是由于我们大学车间在我们大学车间中的手动钣金摩擦机而产生的。在该机器板中，金属放在机器的两个刀片之间，将杠杆拉下以移动上部移动刀片并切割工作件。
See Similar Project:
But in that machine large force is required which can make tire to a worker who continuously works on it for mass production in large scale industry; so to reduce the human efforts pneumatic machine should chose. Hence for some development of machine, we have chosen this subject for our project. We hope that a good idea will develop and we can use it in many industries in surrounding and our practical knowledge, team-working skill, leadership skills will be improved.
介绍:
In shearing or cutting operation as or blade descends upon the metal, the pressure exerted by the blade first cause the plastic deformation of the metal. Since the clearance between the two blades is very small, the plastic deformation takes place in a localized area and the metal adjacent to the cutting edges of the blade edges becomes highly stressed, which causes the fracture to start on both sides of the sheet as the deformation progresses and the sheet is sheared.
See Also:剪切和剪切机的功能
Types of shearing Machine:
1）气动操作
2) Hydraulically operated
3）机架和小齿轮操作
4）春季操作
Brief description of all the types is as follows.
1）气动操作:-
在这里，标头的进步是使用气动双作用活塞和圆柱体装置以及脚部操作的方向控制阀在向上和向下进行的。在这种类型的机器中，高压空气用作电源和运动的转移。
在职的：
最初，启动空气压缩机，并允许接收器储罐气压达到8杆。然后，供应空气通过FRL单元传递给歧管，以调节空气并有资格使用工业用途。
From the manifold a separate supply for the machine is taken out and given to ON-OFF switch, so as to operate the machine at will without interrupting the running of compressor.
然后，管道首先将压缩空气带到机器的方向控制阀。在位置“ A”位置显示非驱动电路图。在这个位置，活塞稳定且锁定。所有端口均处于封闭状态。
在“ B”位置，直流阀处于左侧位置，如图所示。盖端端口和压力端口相互连接，杆端端口连接到排气端口。压缩空气出现在气缸的盖端，并将活塞向外推。杆端端已经存在的空气被从圆柱体上推出。
When the piston moves outwards, the force is transmitted through the connecting link and the upper blade moves downwards. Before the actuating DC valve the sheet is inserted in between the upper & lower blades. As upper blade moves downwards, the stress is generated in the sheet metal and goes beyond ultimate shear stress of sheet metal. And thus the shearing action takes place.
Now the DC valve is operated to come at position ‘C’, as shown in figure. The rod end port & pressure port get connected to each other and the cap end port gets connected to the exhaust port. The compressed air comes in the rod end of the cylinder and pushes the pistons inwards. The air already present in the cap end side is pushed out of the cylinder.
The sheet metal is either again inserted for further cutting in case of large pieces; the small cut pieces are removed and the next sheet is inserted to cut.
Merits-
1. Hydraulics present certain advantages over pneumatics, but in a given application, pneumatic powered equipment is more suitable, particularly in industries where the factory units are plumbed for compressed air.
2. Moreover, to avoid corrosive actions, oil or lubricants are added so that friction effects can be reduced.
3.压缩空气在大多数机器中都使用，在某些情况下，压缩的二氧化碳是轻松的。
4. Fast cutting action is carried out.
5.不弯曲的切割就可以实现。
Demerits–
1. Sheet more than 2 mm thickness cannot cut easily.
2. Compressed air is must.
3. Foundation is required also safety major must be taken.
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