Stamping and sheet metal production involve many fields of manufacturing industry. In recent years, as China has become the world's manufacturing center and consumer power, stamping and sheet metal industry, as one of the basic industries of manufacturing industry, has also achieved unprecedented development. At present, China's equipment manufacturing industry is large but not strong, and the distribution is uneven. The backward heavy equipment manufacturing industry is distributed in the three northeastern provinces, while the new sheet metal equipment manufacturing industry is distributed in the coastal Yangtze River Delta and Pearl River Delta, and has just started, which is difficult to meet the domestic market demand. In the next 5-10 years, the equipment manufacturing industry will still be one of the main industries in China, especially the sheet metal industry in the manufacturing industry.


The improvement of the sheet metal processing industry is the main evaluation aspect that can best reflect the comprehensive capacity of a country's manufacturing industry. The development of the industry will reflect the improvement of the overall quality of the national development economy. China has joined the World Trade Organization for many years, but the current sheet metal processing industry is still scattered. The emerging national industry has just started, and the scale is very small. Industry integration can cope with the impact of foreign enterprises and ensure that national industries have a place in the competition. In the next 5-10 years, in addition to expanding the scale to meet domestic demand, China's sheet metal processing industry also needs to integrate production and supply and demand on the advanced Internet, so as to gain an invincible foothold and prepare for foreign development faster and better.
Analysis on the overall scale of the industry
With the rise of China's manufacturing industry, China's sheet metal and manufacturing industry has developed rapidly. According to the analysis report on market demand forecast, transformation and upgrading of sheet metal processing industry released by forward looking Industry Research Institute, as early as 2012, the whole industry had more than 30000 enterprises (workshops) and 2 million employees, with an annual production of about 42 million tons of sheet metal parts. In 2016, the sales of sheet metal processing industry was about 688.5 billion yuan. However, generally speaking, the sheet metal processing industry started late, the industry scale is generally small, and there is a lack of production and technical personnel. It is difficult to form the core competitiveness of enterprises. The market competition is becoming increasingly fierce, and it does not have the strength to compete with international multinational corporations.
Sales scale of China's sheet metal processing industry from 2009 to 2016 (unit: 100 million yuan)Source: compiled by prospective industry research instituteIndustry economic benefit analysis


At present, on the whole, the economic benefits of sheet metal processing in China are good, and the operating profits of many industrial enterprises are more than 20%. The sheet metal processing industry is mainly engaged in distribution processing for automobile, shipbuilding, precision machine tools, precision instruments, communication electronics, elevators and other industries, and most of the partners are large foreign companies (GE, Bosch, Otis). With the further deepening and lasting cooperation, they learn advanced technology, process, strict and standardized production environment Management experience in production process and other aspects, so as to gradually localize key components and key technologies, which correspondingly reduces the procurement of key components by foreign-funded enterprises from abroad and reduces the production cost of manufacturing enterprises.
At the same time, this method can also do supporting processing for domestic manufacturing enterprises, and enable them to obtain key production technologies, so as to improve the product performance of domestic manufacturing enterprises. At present, there are not many domestic high-precision sheet metal processing enterprises. Developing the sheet metal processing industry in a certain area and providing perfect supporting processing services to domestic and foreign manufacturing enterprises can not only promote the overall development of machinery manufacturing enterprises, but also drive the regional economy to achieve a new leap, and the economic benefits of enterprises are also guaranteed.
With China becoming an international processing and manufacturing center and the increasing foreign investment, the demand for metal processing capacity is increasing. Generally speaking, the electrical control box and machine shell in the metal processing industry are sheet metal parts, so the demand for sheet metal processing capacity is also increasing. In addition, as far as sheet metal processing is concerned, sheet metal processing enterprises usually need a variety of mechanical equipment to meet different process requirements. The punching accuracy of sheet metal is generally about 0.1mm, and the bending accuracy can generally reach 0.5mm. Therefore, compared with sheet metal processing, the accuracy is much lower. Therefore, the progress of industry technology has also brought high profits. For example, the stamping profit margin in sheet metal processing can generally reach about 30%, while the profit of laser cutting is more than 50%.
Industry profit level and change trendOverall, the profit level of sheet metal processing industry mainly depends on product quality and processing precision, products and value-added services, downstream user enterprises and upstream raw material prices. Therefore, in the future, with the increasing technical content of products in the industry, the impact of raw material price fluctuations on products will be gradually reduced, and the change trend of industry profit level will be better.At the same time, the future trend of profit level mainly depends on factors such as product quality and precision, product value-added services and downstream customer industries. Enterprises with strong technical strength, high-end customer resource advantages and management advantages in the industry will obtain a higher profit level in the future fierce competition.

Metal production experts use a variety of different techniques to produce customized parts, fittings, and other industrial and commercial solutions. Each technique produces a completely different product with different characteristics. Whether it is bar milling, sheet metal fabrication, or press brake forming, each has its own purpose and set of benefits.
Press Brake Forming Using a computer operated press brake forming machine, which runs at extreme pressures of approximately 350 tons, this machine literally squeezes metal into shape. Many machines can work with up to a 3/8" thick material that is upwards of twelve feet in length. Press brake forming also works with a variety of different metals including brass, stainless steel, aluminum, and carbon steel. So what is it used for? If you need a metal housing for a particular part, brackets for machines and equipment, metal framing, and even decorative touches, this method will likely be the one used. This is an ideal solution for anyone needing replacement parts, large numbers of brackets, and fastening solutions as well as prototypes for almost any type of machinery.
Bar Milling Bar milling is reforming an existing bar into a particular shape, form, and length to make it fit various jobs and specifications similar to running a router or shaper down a narrow length of wood. This could be by taking traditional round or square bars and making them into hexagonal or angled bars, adding grooves or other features down the entire length. It can also be made from various materials including brass and stainless steel. To create each shape, the specialist puts together a series of cutters that could be bevels, round overs, slots, and much more. Finally, it is milled down to a smooth surface and made into the proper dimensions.
Sheet Metal Fabrication Sheet metal fabrication is ideal for detailing and precision cutting. With this method, specialists can use laser cutting, punching, press brake forming, shearing, and welding to create virtually anything from this super-thin and flexible metal product. It is used for everything from cultivator shovels and hopper bottoms for the agriculture industry to conveyor parts, guards, frames, decorative metal forms, and many other items for a variety of other industries.
Sheet metal fabrication works to build all sorts of covers and frames. It also works as a column cover or for ventilation purposes. Fasteners and other components are also made using this method. This includes many different parts involved in the transportation, refrigeration, and conveying sectors as well as amusement park rides and other recreational activities.
Depending on the task at hand, any one project could be subjected to one or a combination of these techniques. Then, welding is used to piece everything together to finish the completed project. Once that is complete, a quality provider will check the entire piece for quality, durability, and accuracy before handing it over for installation. Whether it is sheet metal fabrication, press brake forming, or some other technique, there is a process and the corresponding technology to produce the exact item you need.

1. Introduction Driven by the increasing competitiveness within the automobile and aerospace sectors, sheet-forming processes have experienced severe changes in the last decades. In the past, press forging was the most widely used sheet-forming process. This manufacturing strategy involves the use of two dies to form the flat metal sheet into the desired final shape. The unavoidable manufacture of these dies makes press forging economically feasible only for the production of very large product batches. Nevertheless, now Rapid Prototyping is becoming increasingly important, as a solution to cope with the more actual demand of testing new parts or products. In fact, manufacturing a small and discrete number of metal parts is in many occasions the most convenient route to validate new products ,.
In this new context, Asymmetric Incremental Sheet Metal Forming (AISF) is consolidating as one of the most promising plastic forming processes to manufacture in a fast way small batches of sheet products from a variety of metallic alloys (e.g. aluminium, titanium or steels) . The term fast is not referred to a short total manufacturing time for each part but, instead, to the short elapsed time between the CAD/CAM design and the beginning of the manufacturing step ,. Thus, in contrast to press forging, AISF allows manufacturing the metal part prototype just immediately after defining the required tool trajectories. Moreover, overcoming the need to prepare, with high accuracy, the pressing dies allows also decreasing the production costs and performing rapid prototyping. Therefore, AISF appears as a very suitable manufacturing approach for innovation and development of new products. Two variants of the ISF process are used: negative forming or SPIF, in which it is not necessary using a die; and positive forming or TPIF, where other dies are usually used ,5,.
Currently, a very limited number of machines specifically designed to apply AISF are commercially available . The investment related to the acquisition of this particular type of equipment, which strongly counterbalances the savings that result from avoiding the use of dyes, is slowing down the establishment of this innovative manufacturing method ,. Implementing AISF in an already available CNC machine centre appears as an interesting approach to overcome this limitation.
This does not only allows diversifying the machining strategies available on this type of more widely spread instruments but also opening novel machining techniques which combine material removal and deformation steps. This finally provides an extra flexibility to the original CNC machine ,9,.
Previous works have already reported the application of AISF on CNCs. As an illustration, J. Kopac and Z. Kampus have reported the use of a CNC milling machine-tool Mori Seiki . On its hand, Malwad et al.
have analysed the details of the deformation mechanisms during Single point AISF on AA8011 aluminium alloy sheets using a 3 axis HAAS CNC Milling Machine . Likewise, R. Ben Hmida et al. have investigated the influence of the initial grain size of FPG copper foils on the material behaviour during SP AISF using a 3-axis CNC vertical milling machine The design of the metal sheet clamping tools is one of the necessary steps to implement AISF on CNCs. The specific characteristics of these tools will result key for the final performance of the adapted machine. This contribution focuses specifically on this aspect. In particular, two alternative designs for this clamping tool is presented which allow fast customization of the working area and which is easily adaptable to different metal sheets formats. Additionally, the manufacture of a prototype of this clamping tool using 3D printing is also presented.
The proposed design refers to a teaching-oriented CNC milling centre. Therefore, the dimensional and operational parameters employed here may differ from others corresponding to CNC equipment used for industrial purposes.
2. Methodology The CNC machine adapted in this work was an ODISEA from Alecop SC, Figure 1(a). Table 1 includes its most relevant technical features. CAD design of the proposed tools was performed using the Dassault System Software "CATIA V5R20". The corresponding PLA prototypes were further prepared on a Cubex 3D printer, Figure 1(b). For the manufacture of the prototypes, the 3D printer parameters previously optimized in ,12, were employed. Finally, let us mention that the corresponding ISF tool to be used with the CNC machine here adapted was manufactured by grinding on a WC-Co bar.
3. Results The major constrains considered for the design of the clamping tool were the maximum dimensions available as working area, the maximum length of the path along the X and Y axis which limit the characteristics of the tool trajectories and the maximum distance between the ISF tool tip and the working table. We have also considered that all the necessary metallic parts involved in the design can be manufactured in fact using the CNC milling machine adapted.
Figure 2 shows isometric views of the proposed CAD design solutions, considering 100 x 100 mm and 100 x 200 mm formats for the metal blanks. The first part of the clamping tool consists of a rectangular-shaped support plate (1), which is fixed to the working table by screws at each of its corners. An array of regularly distributed holes, 3 x 5 in Figure 2, are drilled into this basement plate. Screws inserted from the bottom face of the plate will allow further anchoring of columns (2) onto the top face. Decreasing the pitch between neighbouring holes allows a more flexible customization of the blank dimensions.
Each of the four thick columns is threaded on its two bases so as to allow being tightly fixed to both the support plate and the lower pressing plate (3). The metal blank to be formed by AISF is kept locked by pressing it between two, upper (4) and lower (3), pressing plates. Up to eight screws uniformly distributed along the rim of the pressing plates allow a tight fixation of the metal blank, which will be kept fix at any time during the AISF procedure.
Nevertheless, to ensure a better clamping, lateral shifts of the metal blank are avoided. In order to facilitate its centring, the lower pressing plate was flanged reducing its thickness, by 0.5 mm, up to 1 mm from the inner edge. This clamping tool can be manufactured in an aluminium alloy to make it lighter.
Additionally, a partial or complete die can be fixed by screwing onto the upper part of the support plate in case that two point incremental forming is to be carried out.
Let us finally mention PLA prototypes of all the parts involved in this design were manufactured by 3D printing. Figure 3 shows a general view of all these parts both as separated items (a), after assembling them into the final clamping tool design (b), and mounting it on the ODISEA CNC milling centre (c). Numbers in Figure 3 correspond with the same parts on Figure 2. An ISF tool designed to operate in the adapted CNC centre was manufactured, and is shown as item 5 in Figure 3 (a).
4. Conclusions A design is proposed for a clamping tool that allows implementing AISF on an ODISEA CNC milling centre in a flexible way. With this design SPIF can be combined with other machining operations, like drilling or milling, at the end of the deformation step, thus improving the flexibility of the CNC machine. The proposed design can be manufactured in an aluminium alloy.
In case this design should be transferred to a CNC centre with industrial production purposes aimed at the production of metal parts of larger dimensions, the number of columns supporting the upper and lower pressing plates should be increased, in order to provide a higher stiffness to the clamping tool. By doing so, a higher stability during the AISF process would be guaranteed.
As a further improvement to the design described in this paper, we intend to implement a translation system along the Z-axis of the supporting columns, to synchronize the path followed by the tool with the movement of the clamping tool. This would allow achieving more complex shapes during the ISF process.
DOI: 10.2507/26th.daaam.proceedings.129 5. Acknowledgements The UE (Project COSSTA), the Andalusian Government (PAIDI) and from Fundacion Tecnalia R&I (through the CATEDRA TECNALIA of the UCA) have provided financial support to this work.
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Antonio Calvino (a), Asuncion Rivero (b), Miguel Alvarez (a), Francisco Puerta (a), Jorge Salguero (a), Mariano Marcos (a) (a) University of Cadiz, Faculty of Engineering. Mechanical Engineering and Industrial Design Dept. Av. Universidad de Cadiz 10, E-11519 - Puerto Real, Cadiz, Spain (b) Fundacion Tecnalia Research & Innovation. Scientific and Technological Park of Guipuzkoa. Paseo Mikeletegui 7, E 20009, Donostia-San Sebastian (Guipuzkoa), Spain Caption: Fig. 1. A general view of: (a) ODISEA CNC Milling Center; (b) CubeX Duo 3D Printer.
Caption: Fig. 2. Isometric views of the CAD designs of two possible configurations of the designed clamping tool for two different metal blank formats: (a) 100 x 100 mm; (b) 200 x 100 mm.
Caption: Fig. 3. PLA prototypes of all the parts involved: (a) separated items; (b) Assembly of the ISF clamping tool; (c) Mount of the ISF clamping tool on ODISEA CNC milling center.

Sheet Metal Fabrication is one of the best techniques applied for creating engineering marvels. It can be used for creation of various machines. The overall build quality of Sheet Metal Fabrication is simply superb and according to standards. There are various techniques through which you can join two metal parts but to be on the safer side and have a long reliability, you need to keep up with fabrication as its perfect. Fabrication can be used for those creations which need the capacity to take immense pressure. Yes, fabrication can ensure to hold tight even in worst conditions, the need to have them is because they can work in any condition with any temperature levels. The entire working of fabrication jobs is based on industrial standards; in short you need to have the best working techniques in creating fabricating jobs.Internet is one of the preferred sources through which you can get sheet metal fabrication jobs done. There are various websites available that can be selected as per your needs. All you need to do is log on to the net and find the right one. Before you zero down on any website you might need to see the reputation and working of the website. That will also tell you how to work when it comes online purchase. Check the website reputation in the market; it can be easily done by seeing the testimonials and comments given. They will highlight one of the important features that are the type of service given by a particular brand. If that particular brand has not given the right type of service then it will directly reflect in the customer comments. It will easily tell you to trust this brand or not. Also check for various payment options, these options can help in making the purchase easy and affordable. Also you will save a lot on the transaction amount over the internet. Most online sheet metal fabrication companies offer delivery services. All you need to do is trust them in the right manner and get the product delivered. These delivery services can be used to store the purchases; there are multiple warehouses available too where these brands store the product until the time of consumption does not arrive. Stainless steel fabrication is any time preferable for high end performance; it joins the surface in no time. Cable railing is also in the list of purchases over the internet. They will tell you how to make industrial buying easy and affordable. Considering the internet for sheet metal fabrication is the right option for your needs. Select this one for stainless steel fabrication and see how reliable they are for engineering processes. Also check the type of standardization used for engineering processes; you need to be assured on the fact that international brands and standards do affect the overall performance. Quality matters a lot when it comes to fabrication jobs. Custom projects are also taken care by these fabricating companies, they ensure you get the right product out of your needs, a custom fit is anytime better than regular and standard jobs.

Sheet metal is described as a piece of metal that has been formed into a thin, flat shape. Most fabrication jobs use sheet metal as their base, and use it to fabricate components in various shapes, dimensions, and sizes. Sheet metal fabrication entails the use of operations such as cutting, bending, forming, punching, and welding to achieve the desired shape using metal sheet. The success of your sheet metal fabrication job greatly depends on the capabilities of your chosen sheet metal fabricators. An inexperienced firm might not only delay your project, but deliver unsatisfactory results. On the contrary, an experienced firm is more likely to draw from its extensive experience to understand your exact requirement and swiftly work towards honoring your project.Several components such as electronic enclosures, spiral let down chutes, dispensing hoppers, augers, brackets, and metal frames are a result of sheet metal fabrication.When you set out in your search for sheet metal fabricators, here are certain attributes to look for:
To begin with, choose a firm that has sheet metal fabrication at its core. A specialist firm will be able to give you better service standards using the best talent and machinery.Fabricating sheet metal is no easy task as it calls for a high level of expertise. And it also involves the use of specialized equipment. Both these aspects warrant a proven track record in fabrication jobs that only an experienced player can provide.If you look around the market, you shall notice that most firms offer a very limited portfolio of services such as laser cutting or punching. But a firm that boasts expertise in sheet metal fabrication, as well as several other ancillary services is bound to give you more value for your dollars.Another important aspect to watch out for is whether all fabrication operations are carried out in-house. This reduces dependence on third-party vendors and ensures that your project is completed on time and within budget. Yes, there are sheet metal fabricators that provide end-to-end services comprising engineering and design, shearing, sawing, laser cutting, punching, forming, machining, welding, and assembly.Finally, you need to check if your chosen firm offers a stringent quality management system/program. This will ensure that all the products you procure meet your internal quality standards as well as the general industry benchmarks. Right from material control through welding certifications, it is vital that the fabricator carries out quality checks at every step.While this is an indicative list, you might also want to take a look at the variety of projects handled by the sheet metal fabricators in the past. This will give you a complete picture of the reliability and trust worthiness of the fabrication firm.