Maintenance of Machine tools Prepared By V A

Maintenance of Machine tools Prepared By V. A. Shimpukade

Introduction It is defined as “the work or something keeping in proper condition” It is the action taken to prevent a device or component from failing or to repair normal equipment to keep it in proper working condition The older concept was maintenance was to repair a machine only when the breakdown occurs Later with the advancement of technology and industrial growth the maintenance of machine tool is gaining importance.

Objective 1. To minimize the number of breakdown 2. To keep plant in good working condition 3. To minimize the hindrance and interruption of the work 4. To carry out the work of all the machines smoothly 5. Minimize the loss of production because of equipment failure 6. Prolonging the life of capital assets 7. To minimize the accidents through regular inspection 8. To improve the quality of products

Causes of Breakdown Excessive friction between parts (insufficient/improper/lack of lubrication) Failure to replace the parts that are known to wear Improper and neglected cooling system Poor foundation and excessive vibration Overloading of machine Wrong fuel and faults in some items of equipments Improper handling of the machine by the operator ( lack of knowledge)

Importance of Maintenance 1. Quality of product beyond just preventing breakdowns, it is necessary to keep equipments operates within specifications, that will produce high level of quality 2. Cost Control good maintenance management can control or reduce the company's cost 3. Customer Service to provide good customer service companies must have reliable equipments that will respond to customer demand when needed

4. Market Reputation to keep the reputation in the market, machines or equipments should properly maintained. if breakdowns happens there is danger of permanently losing market shares 5. Cost of investment organizations like Airlines and oil refineries have huge investment equipment failure will be disastrous for such companies

Types of maintenance Following are the types of maintenance v Planned 1. Preventive 2. Predictive 3. Scheduled v Unplanned 1. Breakdown 2. Corrective

Preventive Maintenance Basic principle of this maintenance is ‘Prevention is better than cure’. It is the planned maintenance machine tool at regular intervals The primary goal is to prevent the failure of equipment before it actually occurs It covers vast area like routine inspection, minor repair, lubrication, cleaning, replacement of consumable parts etc. Maintenance work should be carried out by properly trained workers, to ensure rapid work at minimum cost The frequency of this maintenance is planned and it is carried out at fixed time interval Interval is depend on complexity of machine, amount of usage

Functions of preventive maintenance 1. To prevent the failure before it occurs 2. To protect and prevent emergency and breakdown 3. To record the equipment deterioration, so as to know when to repair or replace the worn parts. 4. To minimize the loss of production 5. To keep the maintenance cost and time less 6. To provide safety to the operator 7. To ensure the availability of equipment and ready to use 8. To maintain the productive efficiency

Advantages 1. Reduce equipment failure and increased equipment life 2. Reduced breakdown time 3. Greater safety for workers 4. Fewer large scale repetitive repairs 5. Reduced down time as machine works smoothly 6. Minimize loss of production Disadvantages 1. Catastrophic failure (sudden damage) still likely to occur 2. A group of labour is required 3. Includes unneeded maintenance