CNC machining sheet metal shell processing technology analysis
by：QY Precision 2020-03-07
Dongguan CNC machining sheet metal shell processing technology analysis _ sheet metal shell processing technology under the development of laser cutting technology, basically realized full-automatic operation, is constantly driving the development of the hardware shell industry, the processing effect is remarkable.
Analysis of the hardware shell processing technology, should start from the order, from the product processing and trial production steps, should communicate with customers in a timely manner, get the corresponding processing evaluation, and then carry out mass production of products.
Sheet metal shell processing, with fully automatic equipment, requires the fine work of the staff. (The following figure shows the products processed by CNC in Dongguan)【
According to the difference in hardware structure, the process flow can be different, but the total does not exceed the following points]
1. Blanking: 1 shearing bed: It is a simple material that uses the shearing bed to cut the strip material. It is mainly prepared for the mold blanking forming, with low cost and low precision.
2, but can only process non-hole and non-cutting strips or blocks.
(2) punching machine: the punching machine is used to punch and form various shapes of materials after the parts are unfolded on the hardware plate in one or more steps. Its advantages are short working hours, high efficiency and high precision, low cost, suitable for mass production, but to design molds.
Using the processing procedure of Die forming, punching, cutting angle, blanking and punching convex bag (Bump)
, Punching and tearing, hole drawing, forming and other processing methods, the processing needs to have corresponding molds to complete the operation, such as punching blanking mold, convex packing mold, tearing mold, hole drawing mold, molding mold, etc, the operation mainly pays attention to the position and direction.
(3) NC blanking, NC blanking first to write NC machining program, using programming software, will draw the development map into NC number pull machining machine identifiable program, according to these programs, each structure shape plate is punched on the plate step by step, but its structure is affected by the tool structure, with low cost and accuracy of 0. 15.
(4) laser blanking is to cut the structural shape of its flat plate on a large flat plate by laser cutting. As with NC blanking, laser programs need to be written, which can be used for various complex shapes of flat plates, the cost is high and the accuracy is 0. 1.
⑤ Sawing machine: mainly use aluminum profiles, square tubes, drawing tubes, round bar materials and so on, with low cost and low precision. 1. Fitter: countersunk, tapping, reaming, drilling--
The angle of the countersunk hole is generally 120 ℃, which is used for pulling rivets, 90 ℃ for countersunk head screws and tapping Imperial bottom holes. 2.
Flanging: also known as pumping and turning holes, it is to draw a slightly larger hole on a smaller base hole, and then tapping, mainly processed with thin sheet metal, increase its strength and number of thread turns to avoid sliding teeth. Generally, it is used for thin plate thickness, normal shallow flanging around its hole, and the thickness is basically unchanged, allowing thinning with thickness to be 30-
At 40%, 40-higher than the normal flanging height can be obtained-
The height of 60%, when squeezed 50%, can obtain the maximum flanging height, when the plate thickness is large, such as 2. 0, 2. 5 or more plate thickness, you can directly tapping. 3.
Acrylic: There are mainly acrylic nuts, screws, loose, etc. It is operated by hydraulic riveting machine or punching machine, riveting it to hardware, and lifting method, pay attention to directionality. 4. Bend;
Bending is to fold 2D flat parts into 3D parts.
The processing needs to be completed by folding bed and corresponding bending die, and it also has a certain bending sequence. Its principle is to fold the knife first without interference, and then fold the knife after interference.
Under normal circumstances, press and bend first, but some materials will interfere after press and then press, and some need to be bent-Acrylic-Re-bending and other processes. 5.
Welding: welding is divided into a melting welding: argon arc welding, CO2 welding, gas welding and manual welding; B pressure welding: spot welding, butt welding and collision welding;
C brazing: electric chrome welding, copper wire and other methods, each has its own advantages and disadvantages.
The most commonly used ones are CO2 welding and argon arc welding. Generally speaking, CO2 gas shielded welding is used for iron plate welding, which has the advantages of high productivity, low energy consumption, low cost and strong rust resistance;
Argon arc welding is used in stainless steel and aluminum plate welding, with depth of dissolution, slow dissolution speed, low efficiency, high production cost and tungsten clamping defects, but it has the advantages of good welding quality, can weld non-ferrous metals, such as aluminum, copper, magnesium, etc;
Robot welding can save working hours, improve work efficiency and welding quality, and reduce work intensity.
Sheet metal casing processing also has the problem of welding deformation, the main reason is that the preparation before welding is insufficient, and the fixture needs to be added; Poor welding fixtures need to improve the process;
If the welding sequence is not good, an experienced master is required to adjust it.
The welding strength of the hardware casing is not enough. The spot welding bump can be used to impose the welding area. Usually, the methods for correcting the welding deformation are flame effect method, vibration method, hammering method, and manual aging method.