How to maintain the drawing dies?

Introduction

Wire drawing die is an indispensable tool in metal drawing process, and its performance directly affects the quality and production efficiency of wire. Reasonable maintenance and maintenance can not only extend the service life of the mold, but also improve the yield and quality, and reduce production costs. This paper will introduce the maintenance method of wire drawing die in detail from the aspects of cleaning, lubrication, installation, use specification and regular maintenance.

Second, mold cleaning

Preparation before cleaning

Before using the mold, the surface of the mold must be thoroughly cleaned to avoid residual impurities or chemicals to cause corrosion or damage to the mold. It is recommended to use ultrasonic cleaning equipment and blow dry the mold surface with compressed air.

Cleaning of chemical liquid

The potassium nitrate or potassium nitrate liquid used in the wire drawing process will have a corrosive effect on the mold surface, so the mold surface must be thoroughly cleaned before threading the wire to prevent corrosion.

Third, lubrication and maintenance

Importance of lubrication

Lubrication is the key to prolong the life of the mold. Check the lubrication conditions regularly, remove impurities, replace lubricants if necessary and clean the lubrication system.

Selection of lubricants

The use of high-quality lubricants to ensure the stability of the lubricating oil matrix, good oxidation resistance, the formation of a high pressure layer to reduce friction, thereby extending the service life of the mold.

Frequency and method of lubrication

According to the working intensity of the mold and environmental conditions, the lubrication frequency is reasonably arranged. For example, during high-speed wire-drawing, lubricants need to be added and replaced more frequently.

Four, mold installation and equipment maintenance

Reasonable installation

Ensure mold installation is stable to avoid vibration and uneven force. During debugging, the tensile axis of the wire should be symmetrical with the center line of the die hole to reduce wear.

Equipment maintenance

Regularly check the operating status of the wire drawing equipment, especially the flexibility and runout tolerance of the drum and wire overwheel. Repair the worn parts in time to avoid mold damage caused by equipment failure.

5. Surface polishing and repair

Surface polishing

The mold is tested and polished before use to ensure the surface quality of the wire. With the increase of use time, polishing repair according to the change of pass shape can extend the service life of the mold.

Repair method

For slightly worn molds, they can be restored to their original state by polishing; For excessive wear of the mold, it is necessary to reaming or replacing the mold.

Six, scientific development of maintenance standards

Make specifications according to the type of wire

Different kinds of wire wear different degrees to the mold. For example, ring wear is easy to occur in the process of soft wire drawing, while cracks are easy to occur in the process of hard wire drawing. Therefore, scientific maintenance specifications should be formulated according to the type of wire and drawing characteristics.

Regular inspection and maintenance

Develop and implement daily maintenance standards, timely detect and deal with mold wear problems. For example, the mold of the high-speed wire drawing machine needs to check the lubrication conditions and wear conditions regularly, and take corresponding repair measures.

Summary

Reasonable maintenance is the key to prolong the service life of the wire drawing die. Through regular cleaning, lubrication, reasonable installation, scientific development of maintenance specifications and timely repair of wear parts, can significantly improve the performance of the mold and production efficiency, reduce production costs. It is hoped that this paper can provide practical reference and guidance for users of wire drawing die.