Deep Drawing

The stamping processing method of changing the panel blank into an open hollow part by means of a die is called deep drawing. The drawing process is also known as drawn, calendaring, extension, stretching and so on. It is one of the main stamping processes, which is widely used. The cylindrical, stepped, tapered, square, spherical and various irregular thin-wall parts can be obtained by using the deep drawn stamping method.

The precision of drawing parts is related to many factors, such as the mechanical property and thickness of materials, die structure and die precision, the number of processes and the sequence of processes. Generally, the manufacturing accuracy of drawing parts is not high, and the appropriate accuracy is below IT11.

There are many kinds of drawing parts. According to the change of wall thickness before and after forming, the drawing can be divided into two types: variable and constant thin drawing. At the same time, due to the characteristics of the drawing itself, the upper and lower walls of the drawing part are appropriately thinner, and the thickness after drawing is about (1.2~0.6) t. In addition, the outer wall or flange surface of the part drawn for several times will generally leave the marks produced in the drawing process.

What is Deep drawing

The die for drawing is mainly composed of convex die, concave die and blank holder. Different from the blanking, the working parts of the male and female dies have no sharp cutting edges, but a certain round corner, and the gap is slightly larger than the thickness of the plate. A circular blank with a diameter D and a thickness t is drawn by a drawing die to obtain an open cylindrical work-piece having an outer diameter d and a height H.

In the drawing process, the center part of the blank becomes the bottom of the simple part, which is basically non-deformable and is a non-deformable area; The flange part of the blank is the main deformation zone. The drawing process is essentially the process of gradually transferring the material of the rough flange part to the cylinder wall

Material of drawing parts

The material used for drawing parts shall have good plasticity, small yield ratio σ s/σ b, large plate thickness directivity coefficient and small plate plane directivity coefficient. The smaller the yield ratio σ s/σ b is, the bigger the allowable ultimate deformation is, and the better the drawing performance is. For example, for yield ratio σ s/σ b=0.57 of mild steel, the minimum drawdown coefficient for one draw is m=0.48~0.50; The σ s/σ b of 65Mn steel=0.63, and the minimum drawing coefficient of one drawing is m=0.68~0.70. Therefore, according to relevant material standards, the yield ratio of steel plates for drawing shall not be greater than 0.66.

The plate thickness directivity coefficient and the plate plane directivity coefficient reflect the anisotropic property of the material. When the plate thickness directivity coefficient is large and the plate plane directivity coefficient is small, the deformation of the material in the width direction is easier than the deformation in the thickness direction, and the plate plane performance difference is small. The material is not easy to thin or crack during the drawing process, so it is beneficial to the drawing forming.

Structure Workmanship of Drawn Parts

1.Drawn parts shall be as simple and symmetrical as possible and can be formed in one time,

2. Generally, the wall thickness tolerance or thinning requirement of drawing parts shall not exceed the change rule of wall thickness of drawing process. Based on statistics,
The maximum thickness increase of the cylinder wall of the constant thickness drawing process is about (0.2~0.3) t (t is the thickness of the sheet material), and the maximum thinning is (0.1~0.18) t

3.When the deformation degree of the part in one drawing is too large, in order to avoid cracking, it is necessary to use multiple drawings. At this time, under the premise of ensuring the necessary surface quality, the inner and outer surfaces shall be allowed to have possible traces in the drawing process.

4.On the premise of ensuring the assembly requirements, it is allowed that the side image of the drawn part has a certain slope.

5.When there are holes on the bottom or flange of the drawing part, the distance from the hole edge to the side wall shall meet a ≥ R+0.5t (or r+0.5t),As shown in the figure below.

6.The fillet radius at the bottom and wall of the drawing part, flange and wall, four corners of the rectangular part, etc. shall meet the following requirements: r ≥ t, R ≥ 2t,
rg≥3t。 Otherwise, the shaping process shall be added. For one shaping, the semidiameter of the fillet can be r ≥ (0.1~0.3) t, R ≥ (0.1~0,3) t.

7.The radial dimension of the drawing part shall be only marked with the overall dimension or internal dimension, and shall not be marked with the internal and external dimensions at the same time. For the drawing parts with steps, the dimension indication in the height direction shall be based on the bottom of the drawing parts, as shown in the following figure. If the upper part is taken as the benchmark, the height and dimension cannot be guaranteed easily.

Deep Drawn Stamping Manufacturer

We are a leading deep drawing parts manufacturer based in China, specializing in the production of high-quality and precision-engineered components. With years of expertise and advanced manufacturing capabilities, we pride ourselves on delivering superior products to meet the diverse needs of our clients. High quality material,100% inspection with QC report,On time delivery

We can custom-made various cylindrical or box-shaped enclosures, cups, and other hollow parts. It involves the use of a punch and die to stretch and bend the metal into the desired shape. Our products are widely used in the production of automotive components, household appliances, aerospace parts, and many other products that require complex, seamless, and precisely formed metal components.

Deep drawing process is an ideal method for creating parts such as cans, cups, enclosures, pans, and various structural components.

Our company have a deep understanding of material behavior, tooling design, and process control to deliver high-quality, precision-engineered components. Quality control measures, including dimensional inspection, surface finish evaluation, and material testing, are crucial to ensuring that the deep drawn parts meet the required specifications and performance standards.

Deep Drawing Ability

Material Available	Stainless Steel: SS201, SS202, SS303, SS304, SS316 etc. Steel: Q235, 20#, 45# etc. Brass: C36000 (C26800), C37700 (HPb59), C38500 (HPb58), C27200 (CuZn37), C28000 (CuZn40) etc. Bronze: C51000, C52100, C54400, etc. Iron: 1213, 12L14, 1215 etc. Aluminum: Al6061, Al6063, AL7075, AL5052 etc. Plastic:ABS,POM,Nylon,Delrin,etc Titanium: TA1/TA2/TB1/TC4/TC18, TI GRADE2/GRADE5
Production equipment	stamping Machine hydraulic press machine CNC machining center, CNC milling drilling machine Welding Machine (MIG and TIG welding) polish machine other equipments
Surface treatment	Anodizing:color anodizing,hard anodizing Plating: Nickel, chrome, zinc plating,powder coating Polishing: Electrolytic polishing,mirror polishing heat treatment ,sand blasting, Brushing.etc, other finish are available as customers’ request
Tolerance	+/-0.1 ~ 0.005mm/as customized
MOQ	50pcs
Qc system	100% inspection before shipment material certification are available upon request.
DRW format	pdf/.dwg/.igs./.stp/x_t. etc
Lead time	7-25days,depend on quantity
Terms of payment	L/C, Paypal,T/T West Union,etc.50% in advance, 50%before shipment, to be confirmed
Lead time	7-20 working days, depend on quantity
Sample	Samples could be arrange prioritised production as long as everything confirmed by both sides.

Our Services

Our goal: delivering high quality stainless steel deep drawing part with zero defects to all our customers. We intend to meet all the requirements of every design.Our company will use our expertise to reduce your cost for mutual win business.

Full experience

We have over 20 years of experience in the field of sheet metal deep drawing.The most favorable processing solutions will be provided based on the customer’s product situation.

Strict inspection

From material to final products ,we control very stick for the quality. The material of each lot will be checked. All Final products will be inspected before shipping.

Drawing die warehouse

To make sure our quality, all our customer’s deep drawing dies will be well stocked at our factory.

Flexible packaging methods

1. Inner Packaging: PP bag, bubble bag, plastic wrap etc.
2. Outer Packaging: carton, wooden case, pallet etc.
3. According to customers’ requirement.

Deep Drawing parts shipping way:

(1).0.5kg-150kg best choice is by Express.
(2). Heavy goods: by sea is available
(3). We can also deliver as client’s requirment
(4). 7-30days after receiving payment/ deposit
(5).Nearest Port:shenzhen Hongkong convenient and efficient transportation
(6).we will choose the cheapest and safest way to shipped the stainless steel deep drawing part.

Ask a free quote

In order to quote you as son as possible please provide us the following information:
1) Detail drawings(CAD / PDF/ DWG/ IGS/ STEP)
2) Material
3) Quantity
4) Surface treatment
5) Any special packing or other requirements
6)Target price if you have