(Total Issue 120)

coastal enterprises and science & technology

Coastal enterprises and science and technology; technology

No.05,20 20 10/0

(Cumulative number 120)

Influence analysis of stamping die life

Lan Weidong

[Abstract] Die life refers to the total number of parts that can be processed by the die under the premise of ensuring the quality of product parts, including multiple grinding and easy working faces.

Life of damaged parts after replacement. In this paper, the factors affecting the service life of stamping die are analyzed in detail, and the corresponding improvement measures are put forward to improve the service life of stamping die.

[Keywords:] Die life; Influencing factors; improvement measures

[Author's Brief Introduction] Lan Weidong, a second-level practice instructor in the Department of Mechanical and Electrical Engineering of Liuzhou Vocational and Technical College, has studied mechanical manufacturing and machining, numerical control machining and Guangxi.

Liuzhou, 545006

[China Library Classification Number] TG 385.2 [Document Identification Number] A [Document Number]1007-7723 (2010) 05-0048-0002

I. Introduction

Die life refers to the life of the die before ensuring the quality of the product parts.

By the way, the total number of parts that can be machined includes the number of working faces.

Life after secondary grinding and wearing parts replacement. Mold life can generally

Divided into design life and service life, in the mold design stage should be

Identify the production batch type or mold production system suitable for molds.

The total number of parts, that is, the design life of the mold; Under normal circumstances,

The service life of the mold should be longer than the design life. Different types of modules

The forms of normal damage are also different, and the failure forms of stamping dies are also different.

Mainly wear failure, deformation failure, fracture failure and bite failure.

Wait a minute. However, due to different stamping processes and working conditions, the impact

There are many factors that affect the life of stamping die.

The following is about mold design, mold manufacturing, mold

The factors affecting the life of stamping die are analyzed from the aspects of use.

The corresponding improvement measures are put forward to improve the service life of the die.

Second, the factors affecting the life of stamping die

(A) Stamping die design

1. Mold design quality

Mold from the structure, material selection, to the determination of key parameters, are made up of

Mold designer decided. This requires designers to have higher skills.

Technical quality and rich practical experience, thus ensuring the design.

The quality of the mould.

2. Mold structure

Reasonable die structure is helpful to improve the bearing capacity of the die

Force, reduce the thermal mechanical load level of the mold. For example, death

It has a reliable guiding mechanism, which can avoid the mutual interference between the punch and the die.

It is helpful to chew each other's wounds.

3. Accuracy of the guide mechanism

In order to improve the service life of the mold, it is necessary to improve the quality of the mold according to the process nature and zero.

Accuracy and other requirements, correctly select the guide rail form and determine the guide rail machine tool.

Accuracy of structure. Accurate and reliable guidance to reduce mold work.

The wear of parts has a great influence on avoiding the biting of convex and concave dies. general situation

In this case, the accuracy of the guide mechanism should be higher than that of the male die and the female die.

4. Geometric parameters of the cutting edge of the die

The shape, fit clearance and fillet radius of the punch are not only correct

The forming of stamping parts has a great influence, and it also affects the wear of dies.

And also has a great influence on the life span. If the accuracy requirement is high, the smaller one should be selected.

Gap value; On the contrary, the gap can be appropriately increased to improve the service life of the die.

Life.

(2) Mold manufacturing quality

When manufacturing molds, we should consider the mass production of product parts.

Small, choose mold material. Pay attention to the metallurgical quality of mold materials.

The influence of process defects on the bearing capacity of the machine should be adopted.

Take necessary measures to make up for the deficiency of metallurgical quality, so as to improve the mold.

Long life. Usually according to the material characteristics of stamping parts, production batches,

Accuracy requirements, etc. , choose excellent mold materials, taking into account at the same time.

Its manufacturability and economy.

The quality of mold manufacturing depends on each part of the mold.

Manufacturing accuracy and workers' assembly level are also affected by machine tool accuracy.

Low, poor workers' skills and backward inspection methods.

(3) Stamping equipment

The precision and rigidity of stamping equipment (such as press) have great influence on stamping die.

The influence of longevity is extremely important. Stamping equipment has high precision and good rigidity.

Well, the life of the mold has been greatly improved.

(4) Surface quality of mould parts.

The machining surface quality of die working parts is very important to die.

Wear resistance, gluing resistance and fracture resistance have significant effects.

Ring, directly affect the service life of the mold. Especially rough surfaces.

The degree value has a great influence on the life of die. If the surface roughness value is too large,

Stress concentration will occur when working, and it will be contained between its peaks and valleys.

Cracks are easy to occur, which will affect the durability of the mold and workpiece table.

The corrosion resistance of the surface directly affects the service life and accuracy of the die.

48

(5) Correct use and reasonable maintenance of molds

In order to make the mold produce normally, improve the quality of stamping parts and reduce the cost.

The cost is low, which prolongs the life of the mold, so it should be used correctly and reasonably.

Protect the die and strictly implement the "three inspections" system of stamping die (before use

Check, check in use, check after use).

Do a good job in mold maintenance and overhaul. Its work content

Including the correct installation and debugging of the mold; The depth of that punch into the female die;

Correct the extension of the lower dead center of the upper die in the process of bending, cold extrusion and shaping;

Also pay attention to re-grinding the cutting edge of the polishing mold in time; Pay attention to keep the mold.

Clean and reasonable lubrication and so on.

(six) the process quality of stamping products

If the stamping process is unreasonable, it will cause the shape of the product and

The dimensional accuracy can not meet the requirements, such as excessive decoration allowance, which will cause production.

The product section quality is poor. Incorrect calculation of wool expansion size will lead to

The dimensional accuracy of products after bending or deep drawing can not meet the requirements. In return

Mold repair, incomplete or inaccurate product process faults will be committed.

The finished mold has been repaired and tested many times.

(VII) Mould aging

Many enterprises still have many models that have been used for many years.

With the use of tools, many die parts are worn and their service life has reached, but due to

In the absence of new mold manufacturing, in order to meet the production needs, a dead horse is a living horse doctor.

Dr. Ma led to frequent mold repair and repeated mold trials.

(8) Influence of mold testing

In mold debugging, the accuracy of mold testing equipment used, mold testing

The skills and experience of the personnel, whether the problem of mold trial is fully exposed and whether it is correct.

The number of mold trials has a great influence. If the accuracy of the mold testing equipment is poor, please try.

Poor skills of mold workers will cause mold damage or mold trial.

The parts are unqualified.

Third, the main measures to improve the life of stamping die

First of all, we should improve the quality of product design to make every part of the product

It has good stamping process, casting process and forging process.

The second is to copy the old molds with long service life in time, so that every

There are two or three sets of molds available for each product, and the scrapped ones will be reported.

Waste.

Third, we should strengthen the management of mold trial and choose good equipment and equipment.

Experienced workers try to fully expose and reduce the problems.

Number of mold trials.

Fourth, we should speed up the technological transformation of the equipment in the mold factory. Not good.

Equipment, can not produce high-quality molds, the company should repair as soon as possible.

Rebuild the Swiss coordinate boring machine and add some precision equipment, such as coordinate grinding.

Machine bed, universal grinder, CNC milling machine, wire cutting, EDM.

Punching machine and other equipment.

Fifth, improve workers' skills, strictly control quality and intensify inspection.

Methods to improve the quality of mould manufacturing.

Sixth, we should strengthen training and raise the level of mold designer.

In a word, stamping die plays an important role in die design, manufacture, use and maintenance.

In the process of maintenance, advanced manufacturing technology should be adopted and implemented.

Total quality management, committed to the development of specialized production, strengthen

Standardize molds, continuously improve the level of mold design and manufacturing,

This is beneficial to improve the service life of the die.