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Deep Draw Press Manufacturers

Deep Draw Press Manufacturers

We are one of the deep draw press manufacturers. Deep drawing process & Deep drawing press & Double action deep drawing press & Triple action deep drawing press

The Swift Cup test is usually considered to provide a measure of the drawability of sheet metal. A schematic representation of the Swift Cup test is shown in Figure 2.4. A disc-shaped sheet specimen of metal is placed between the blank holder and the die and then it is drawn into a cup by a cylindrical punch.

A cup with a cylindrical shape will be formed after that. Various shapes were proposed by Swift for the bottom of the punch, but in the present study, only flat-ended punches will be considered.

Deep Draw Press

A deep draw press is a type of metalworking press used to transform flat metal sheets into three-dimensional shapes. It is a versatile tool that can produce a wide range of products, including cooking pots, pans, automotive parts, and electrical enclosures.

How a Deep Draw Press Works:

  1. Blanking: A stamping press is used to cut out a flat blank from a sheet of metal. The blank size is slightly larger than the desired final shape to allow for metal flow during the drawing process.
  2. Heating: The blank may be heated to improve its formability and reduce the risk of cracking. Heating is particularly important for thicker materials or complex shapes.
  3. Loading: The blank is placed on the blank holder of the deep draw press. The blank holder firmly grips the blank around its edges, preventing it from wrinkling or buckling during the drawing process.
  4. Drawing: The punch, a tool with the desired shape of the final product, descends into the blank holder, forcing the blank into the desired shape. The blank flows over the punch, forming the desired three-dimensional shape.
  5. Trimming: Excess material around the edges of the drawn part is trimmed away using a trimming die. This ensures that the final part has a clean edge and meets the desired dimensions.

Types of Deep Draw Presses:

  1. Single-Action Deep Draw Presses: These presses use a single ram to perform both the drawing and trimming operations. They are relatively simple and inexpensive, but they are limited in the complexity of shapes they can produce.
  2. Double-Action Deep Draw Presses: These presses have two rams, one for drawing and one for trimming. This allows for more complex shapes to be produced, as the drawing ram can continue to draw the blank while the trimming ram trims the edges.
  3. Triple-Action Deep Draw Presses: These presses have three rams, one for drawing, one for trimming, and one for ejecting the finished part. They are used for producing the most complex shapes, such as those with undercut features or re-entrant angles.

Applications of Deep Draw Presses:

Deep draw presses are used in a wide variety of industries, including:

  • Automotive Industry: Producing car body panels, fenders, hoods, and other automotive components.
  • Appliance Industry: Manufacturing cooking pots, pans, sinks, and other appliance components.
  • Aerospace Industry: Creating aircraft components, such as fuel tanks, fuselage sections, and engine housings.
  • Electrical Industry: Producing electrical enclosures, housings, and components.
  • Construction Industry: Manufacturing architectural panels, roofing components, and ventilation ducts.

Benefits of Using Deep Draw Presses:

Deep draw presses offer several advantages over other metalforming methods, such as stamping and casting:

  • Versatility: Deep draw presses can produce a wide range of shapes, from simple cylinders to complex geometries.
  • Accuracy: Deep draw presses can achieve high levels of accuracy and consistency in the dimensions of the finished parts.
  • Efficiency: Deep draw presses can produce parts quickly and efficiently, making them a cost-effective manufacturing method.
  • Material Savings: Deep draw presses can produce parts with minimal waste of material.
  • Strength and Durability: Deep-drawn parts are generally stronger and more durable than those produced by other methods.

In conclusion, deep draw presses are versatile and powerful tools that play a crucial role in various industries. Their ability to produce complex shapes with high precision and efficiency makes them an essential part of modern manufacturing.

Punch of the Deep Drawing Press

Let the radius of the punch and the radius of the specimen be a and b
respectively. Then the ratio between these two radii that is also known as the drawing ratio, can be written as b/a. One of the principal objectives of the Swift Cup test is to determine the limiting drawing ratio, LDR which is defined as the largest drawing ratio from which a cup can be drawn without fracture. The better drawing materials are recognized as those having the higher LDRs.

The result of the Swift Cup test correlates well with the performance of sheet metal in deep drawing components. It can be tested with a variable size of sheet metal blank by increasing the diameter. The maximum blank size that can be drawn without fracture occurring over the punch nose can be used to calculate the LDRs.

Because the condition of the edge of each blank can have an important effect on the test result, the blank edges are usually turned in a lathe to ensure strain-free, hurt-free edges. The limiting drawing ratio (LDR), is commonly used to provide a measure of the drawability of sheet metal. The correlation of the LDR of sheet metal with its material properties and process parameters has been activated by the industrial necessity for improving drawability.

LDR is a ratio between the maximum blank diameter that can be drawn successfully to the cup diameter and is often taken measured as a measure of drawability (Verma and Chandra, 2006). The drawability of sheet metal or LDR can be determined from different diameters of blanks with constant thickness. The LDR can be expressed as shown in Equation 2.1.

The Blank for the Deep Draw Press Manufacturers

Sheet Metal for Deep Draw Press Manufacturers
Sheet Metal for Deep Draw Press Manufacturers

The blank diameter or sheet metal diameter is one of the most important parameters that have to consider in determining the LDR. Theoretically, the bigger the blank diameter it is, the higher value of LDR. It means the blank with a high value of LDR is a good material to consider in the deep drawing process. Many researchers have studied the effect of normal anisotropy, and strain hardening exponent, n, on the limiting drawing ratio using either experimental studies or numerical models.

The anisotropy is important in symmetrical draws was first shown by Whiteley (1960) and the research that has been done by Whiteley was used widely nowadays. Whiteley state that the LDR depends on. The higher, the better is the LDR. It was also concluded that LDR does not depend in any significant manner on the strain-hardening exponent. Similar conclusions were also reached by several experimental investigations (Verma and Chandra, 2006)

Nevertheless, sheet metals with higher average strain values such as alpha titanium are generally more desirable in deep drawing due to their higher formability. However, in actual applications, the price of the material needs to be considered to keep production costs realistic. In addition, the planar anisotropy also needs to be considered as it would affect the formation of ears.

Most of the deep-drawn products today are usually made of steel and aluminum alloys as they have higher formability and lower price compared to other metals such as copper and tin. The high strength stiffness to weight ratio, good formability, and good corrosion resistance of aluminum alloys make it an ideal candidate to replace heavier materials such as steel in fulfilling the weight reduction demand in the automotive industry

Forming Limit Diagram for the Deep Draw Press Manufacturers

The concept of forming a limit diagram (FLD) represents the first safety criterion for deep drawing operation. Marciniak and Kuczynski (M-K) have proposed a mathematical model for the theoretical determination of FLD that supposes an infinite sheet metal to contain a region local imperfection where heterogeneous plastic flow develops and localizes (Slota and Spisak, 2005).

Meanwhile, From FLD, the forming limit of sheet metal can be predicted by measuring the reading of minor strain and major strain from the experiment and converting the data into FLD. The FLD, which is consequently been widely referenced in the sheet metal forming industry is now a standard characteristic in the optimization of sheet metal forming processes. In FLD, the higher level of FLD can obtain, the more good material that was used.

The Punch Force

The first deep drawing operation is not a steady-state process. The punch force needs to supply the various types of work required in deep drawing, such as the ideal work of deformation, redundant work, friction work, and the work required for ironing. The punch forces can be divided between the first drawing operation and the following drawing operations