Guide to Key Technologies and Problem Solving for Stainless Steel Stamping Parts

Contents:

Chapter 1 : Important problems and solutions in stainless steel stamping

1.1 The substance is what causes springback.

1.2 Mold design needs to be very precise

1.3 Finding a balance between heat treatment and str ength needs
1.4. Mold wear that is fastened

1.5. The Importance of Choosing the Right Stamping Lubrican

Chapter 2 Common Issues and Fixes for Stainless Steel Stamping

2.1. Scratches or abrasions on the surface
2.2. Cracks that happen while molding
2.3. The material sticks to or attaches to the mold (interlocking)

Chapter 3. To sum up

Chapter 4.  FAQ of Stainless steel Stamping part

Because they are resistant to rust, strong, and look good, stainless steel stampings are used a lot in hardware, electronics, electrical appliances, car parts, and medical equipment. Stainless steel, on the other hand, is very hard, has a lot of springback, and work hardens a lot, which makes the forming process harder.
This article gives a full technical look at the main problems, important aspects, and popular ways to fix them in the manufacture of stainless steel stamping.

Chapter 1. Important problems and solutions in stainless steel stamping

1.1. The substance is what causes springback.

Stainless steel, like 304, which has a hardness of about 187 HB, has a very high yield strength. It tends to spring back after being formed, which makes it less accurate in terms of size.

Answer

Use springback compensation or overbending compensation while designing a mold.

We use CAE simulation to forecast how much rebound there will be.

Put more pressure on the blank holder to cut down on waste.

To lower stress concentration and springback, make the mold's corner radius bigger.

1.2. Mold design needs to be very precise

Because stainless steel may spring back and harden when worked, molds for it need to be more exact and long-lasting than molds for low-carbon steel.

Answer

(1) Used to make up for rebounds

Give room for mold cavity compensation.

For shapes that are hard to make, progressive molding dies are utilized to change the shape bit by bit.

(2) Used for changing shape during heat treatment

If the parts need to be heated:

Expect the mold to shrink or warp and change its proportions as needed.

To keep the shape stable, use locating pins or restraining structures.

A straightening/calibration mold is used for a second correction after heat treatment.

1.3. Finding a balance between heat treatment and strength needs

Some stainless steel parts need to be harder, yet heat treatment might lead them to bend or shatter.

Answer

Meets general strength needs:

Choose 304DQ or 304DDQ deep-drawing steel and don't heat treat it.

Use: When you need more strength

First, it is stamped, and then it is heated at a low temperature.

After heat treatment, use calibration molds to fix any distortion.

1.4. Mold wear that is fastened

Stainless steel is robust and hard, which will quickly wear down the cutting edge and the contoured surface.

Answer

(1) Choosing the material for the mold

Use carbides like YG8 or

High-speed steel (HSS, like W18Cr4V)

Nitriding treatment is done to get a hardness of HV800 or higher.

(2) Keeping edges and surfaces in good shape

Sharpen and polish the blade often to keep it sharp.

Keep your edges from getting dull, which can create burrs, scratches, and tears.

1.5. The Importance of Choosing the Right Stamping Lubricant

The high coefficient of friction of stainless steel makes it more likely to wear down, get scratched, and crack.
 : Suggested lubricant

Deep drawing oil made of sulfur-chlorine composite stainless steel

Sulfur makes a layer that protects and lubricates.
Chlorine: Has great qualities for handling tremendous pressure

Use a high-viscosity oil (like 100#) to make a stable oil coating for thick materials or deep drawing.

Please choose a stamping oil that is easy to clean if the parts need to be cleaned after they are made.

 

Chapter 2 2. Common Issues and Fixes for Stainless Steel Stamping

2.1. Scratches or abrasions on the surface

reason

The mold has a bad surface finish.

Contamination of the surface of the material

Not enough lubrication

Answer

Polish the mold cavity to a roughness of 0.2 μm or less.

Before stamping the material, clean the surface.

Add more stamping oil

Put the polyurethane pressure plate pads on to reduce friction.

2.2. Cracks that happen while molding

reason

Not enough ductility in the material

The mold radius is too small.

Drawing too fast

Answer

Use stainless steel with a high ductility, like 304 austenitic stainless steel.

The mold's radius should be R ≥ 5t, where t is the thickness of the material.

Lower the speed of the molding to 50 mm/s or less.

2.3. The material sticks to or attaches to the mold (interlocking)

reason

discrepancy in the viscosity of the lubricant

Mould clearing that isn't right

Material sticks to the mold surface
Answer
Thin materials work best with low-viscosity oils, while thick materials work best with high-viscosity oils.

Optimizing Mold Clearance: One-side Clearance = 1.05–1.1t Chrome plating on the mold's surface makes it less sticky.

Chapter 3. To sum up 

Important Things That Affect the Quality of Stamping To make high-quality stainless steel stampings, you need to have precise control over the qualities of the materials and the design of the process.

✔ High hardness → Better resistance to mold wear

✔ High stiffness means high-precision compensation and process control.

Work hardening means getting the most out of speed, lubrication, and radius. List of things to do Polishing and cleaning the lubricating system are needed for a high-quality surface finish. Manufacturers can only get consistent molding consistency, high dimensional precision, and great surface quality when the mold design, material qualities, and process parameters are all properly aligned.

Chapter 4.  FAQ of Stainless steel Stamping part

4.1. What is stamping with stainless steel?

Using stamping dies and presses, stainless steel stamping shapes sheets of stainless steel into particular parts. It comprises punching, blanking, bending, deep-drawing, embossing, and shaping.

4.2. What kind of stainless steel are often used for stamping?

Some common grades are:

SS304 and 304L are the most common types and are very resistant to corrosion.

SS316 / 316L has better resistance to corrosion (marine, medical)

SS301 is quite strong and works well for spring parts.

SS430 is a ferritic kind that is easy to shape and costs less.

4.3 What makes stamping stainless steel harder than stamping carbon steel?

Stainless steel has:

More hardness

Big springback

Strong inclination to work harden

More friction on the surface
These things make it harder to manage the press, lubricate the tools, and make the tools work.

4.4. How to make stainless steel stamping less springy?

Make the bending radius more accurate

Use procedures for over-bending

Use dies with more strength

Choose materials that don't work harden as much or optimize annealing.

Make sure to use the right amount of oil and adjust the speed of the press.

4.5. What kinds of production methods can be used for stamping stainless steel?

Progressive die stamping

Deep drawing

Fine blanking

Laser cutting and secondary forming

Bending with CNC

Stamping for transfer

4.6 What are some common uses for stamped stainless steel parts?

Home appliances (kitchen tools, brackets)

Devices for medical use

Parts for cars

Electronics (cases and housings for batteries)

Machines used in industry

Clips and fasteners for springs

4.7. What kinds of surface treatments can be put on stamped stainless steel parts?

Deburring and tumbling

Finish with polishing or a mirror

Sandblasting

Passivation

Electropolishing

Brushing (with a hairline finish)

4.8. How much tolerance can be reached?

Common stamping tolerances:

For common stamped parts, ±0.05–0.1 mm

±0.01–0.03 mm for precise micro-stamped pieces (depends on the thickness and tooling)

4.9. What information do you need to get a price for stainless steel stamping?

Most of the time, suppliers need the following to make a quote:

2D sketch (PDF, DXF)

3D model (STP, STEP, IGES)

Quality and thickness of the material

Requirements for surface treatment

Estimated number of orders

Special needs for packing or inspection

4.10. Does stainless steel need to be heated before or after stamping?

At times.

Annealing: Necessary for deep drawing to make it less hard

Stress relief: Helps keep things from changing shape

Treatment with a solution: for parts that are safe for food or medical use

4.11. How can you keep stainless steel from getting scratched while stamping?

Put on a protective film

Make the surface of the die harder and smoother

Use the right kind of oil

Make the most of stacking and handling parts

After stamping, remove the burrs.

4.12. Is it possible to deep-draw stainless steel?

Yes. Stainless steel (particularly 304/316) can be used for deep drawing, however it may need:

Oils with a lot of lubrication

Several steps of drawing

Annealing in the middle

Optimized die radius

4.13. What makes burrs appear on stamped stainless steel parts?

Some common explanations are:

Worn or soft dies

Die clearance that is wrong

Fast press speed

Variation in the thickness of the material
Fix: regrind or replace dies, change the clearance, or use fine blanking.