How to manufacture deep drawn parts: A comprehensive guide to deep drawing
When you think of manufacturing processes, welding or cutting usually come to mind first. These two processes appear on just about any list of manufacturing methods. But what if your part has more than just surface features? What if it also has a three-dimensional shape? In that case, you need a different type of manufacturing process, one that accounts for the depth of every individual feature. To do this, you must use a specialized production method known as "deep drawing". It may not be as well-known as other manufacturing processes, but it is no less important. In this article, you will learn everything you need to know about deep drawing, from its history and advantages to the different types and the materials used in the process.
Understanding deep drawing
Before we dive into the specifics of deep drawing, let's take a moment to understand what it is and how it differs from other manufacturing processes. When manufacturing a part by welding or cutting, the goal is to create a part from scratch out of a raw material. In contrast, parts produced by thermoforming already have an existing shape. Essentially, the process begins with an existing part that is formed into a different shape using a special technique. Deep drawing is a type of thermoforming. In this process, the shape of an existing part is altered through pressure to create something new. This can involve a plastic sheet, but it can also involve a metal sheet. The process of creating a new three-dimensional shape through pressure is often referred to as "forming".
The advantages of deep drawing
This section covers the advantages of deep drawing and the importance of this process. – Greater part complexity – If the parts you want to produce are simple, you might have a chance at success with a simple bending process. However, if you want to produce parts with complex geometries, there is no better option than deep drawing. – More cost-effective than other processes – The cost of a deep drawn part is typically significantly lower than the cost of a part produced by machining or another subtractive process. – Lower risk of errors – Other manufacturing processes always carry the risk of errors. You could have a faulty setup or make a mistake in programming. Deep drawing, on the other hand, is highly controlled. The risk of errors is therefore much lower.
Types of deep drawing
There are many types of thermoforming. Although some of them are similar, each of these processes has its own advantages and disadvantages. It can be difficult to know which process is best suited for a particular application. When considering the use of a thermoforming process, it is important to understand what each process can do so that you can make an informed decision. – Vacuum forming – This is the most common type of thermoforming. A plastic sheet is heated until it is soft and then placed over a mold. A vacuum is then used to remove the air between the plastic and the mold, which creates pressure and forces the plastic into the desired shape. – Inflation forming – Inflation forming is a variant of vacuum forming, but instead of removing air, gas is added. The gas is typically air or steam. Adding the gas increases the pressure. Inflation forming is often used to produce items such as balloons and bags. – Sheet forming – In this process, a plastic sheet is heated and formed over a mold. This can be done with or without pressure. The difference between this and other thermoforming processes is that the plastic sheet is already formed. You only need to bring it into the desired shape. – Extrusion – This type of thermoforming is applied to metals. A die is used to shape the metal into the desired form. In this process, the material is melted and pressed through a nozzle. The plastic is then allowed to cool, resulting in a formed part.
How to manufacture a part through deep drawing
Deep drawing is a process that involves many steps. To produce a part using this process, you must first create a rough shape, known as a "pattern". The pattern of a part is not the same as a blueprint. It is a physical pattern created by stacking sheets of paper, cardboard, or other materials. The pattern serves as a tool for creating a die, which is used to apply pressure to the part. Parts for deep drawing can be made from many different materials, including metal, plastic, and paper. Once your pattern is complete, you use it to make a die. The die is the tool used to apply pressure to the part. To make the die, you place the pattern in a press and then place the part on top of the pattern. When the press is closed, it applies pressure to the part, which deforms it and gives it the desired shape.
3D forming in deep drawing
To create a specific shape, you don't necessarily have to create a part from scratch. You can also use a process called 3D forming during deep drawing. 3D forming is used to add features inside a part. In other words, you create features that extend below the surface of the part. Using 3D forming during deep drawing, you can add holes, ribs, grooves, or other features that are not visible on the surface of the part. This is a very important process, especially when manufacturing parts for the automotive industry. These parts often require features that go below the surface. In this case, deep drawing is the perfect process.
Key takeaways
– Deep drawing is a thermoforming process in which an existing part is deformed through pressure. – It can be applied to a wide variety of materials. – It is used to produce more complex parts than bending. – It can also be used to create features that extend below the surface of the part. – It is commonly used for automotive parts. As you can see, deep drawing is an incredibly useful process. It can be used to manufacture almost any part, from simple items like plastic cups to more complex components like car doors. It is a good choice when you need a controlled and predictable process.