Defects in Extrusion - Forming Process - Production Process 1

TL;DR

This video discusses the various defects that can occur in extruded products, including inhomogeneous deformation, surface cracking, center bursting, variation in structural properties, and hot shortness.

Transcript

click the Bell icon to get latest videos from equator hello friends today we are going to see certain defects which occur in an extruded product or during the process of extrusion what are they we are going to see in this video so during the extrusion process or in the extruded product you have certain deformation which are listed below at times th... Read More

Key Insights

• ❓ Inhomogeneous deformation can occur due to the difference in motion between the billet and cylinder during extrusion.
• 💁 Surface cracking is a common defect caused by the formation of microcracks on the surface of the extruded product.
• 😘 Center bursting is a consequence of low extrusion ratios and frictional conditions.
• 😅 The high hot working temperatures during extrusion play a significant role in the variation of structural properties.
• 😅 Hot shortness is a specific defect that affects aluminum, causing melting or reduced spots in the material.
• 🆘 Understanding these defects can help improve the quality and reliability of extruded products.
• 🎮 Proper control of extrusion parameters can minimize the occurrence of these defects.

Questions & Answers

Q: What is inhomogeneous deformation in extruded products?

Inhomogeneous deformation refers to a defect where the outer surface of the extruded product shows deformities because the billet's motion is higher than the outer periphery of the cylinder during the extrusion process.

Q: How does surface cracking occur in extruded products?

Surface cracking happens when the material passes longitudinally through the die, causing thin microcracks to form on the surface during solidification.

Q: What causes center bursting in extruded products?

Center bursting occurs when the extrusion ratio and frictional conditions are low. This leads to the bursting of the center of the extruded product or the formation of small burrs.

Q: Why does variation in structural properties occur in extruded products?

Variation in structural properties is a result of high working temperatures during the extrusion process. The continuous change in the product's structure can lead to gains or regressions in its structural properties.

Summary & Key Takeaways

• Inhomogeneous deformation can occur when the billet is moving faster than the outer periphery, leading to defects on the outer surface.

• Surface cracking happens when thin microcracks form on the surface as the material passes through the die.

• Center bursting occurs when the extrusion ratio and frictional conditions are low, resulting in bursted centers or small burrs on the extruded product.

• Variation in structural properties is caused by the high working temperature during extrusion, leading to changes in the structure.

• Hot shortness is a defect specific to aluminum, where the material starts melting at high temperatures, resulting in reduced or melted spots.