What do you understand by hot machining?

Hot machining is a method to externally heat the workpiece. material before or during machining operation. As a result, the. softened material would be machined easily to reduce tool wear. and increase production rate.

What are the two types of machining?

There are three main kinds of machining: turning, milling, and drilling. There are other processes that also fall into the category of machining, but when it comes to modern machining processes, turning, milling, and drilling cover the majority.

What are examples of machining?

Example of machining processes

• Turning—Basic purpose of turning is to reduce the diameter of a cylindrical job.
• Milling—While turning inherently produces cylindrical surface, milling is used to make flat or stepped surfaces.
• Facing—It is performed to make a surface flat and substantially smooth.

Why is heat produced in machining?

HEAT GENERATION IN CUTTING TOOLS. Heat is generated in three ways; by the deformation of the metal in the shear zone ahead of the cutting edge, at the point of separation when the metal is physically pulled apart and by the friction of the chip as it rubs along the surface of the tool as it is pushed out of the way.

What is hot working?

Hot working improves the engineering properties of the workpiece because it replaces the microstructure with one that has fine spherical shaped grains. These grains increase the strength, ductility, and toughness of the material.

What is the difference between cold working and hot working?

Key Difference – Hot Working vs Cold Working The key difference between hot working and cold working is that hot working is done at temperatures above recrystallization temperature of the metal whereas cold working is done at temperatures below the recrystallization temperature of the metal.

Is sawing a machining process?

The machining process primarily used to part material such as rough-cutting excess material away before machining or cutting curved patterns in sheet metal. Sawing machines substitute mechanical or hydraulic powered motion for arm motion to achieve the speed necessary for production operations.

What is the disadvantage of the machining processes?

The limitations of machining process are as follows. Consistency in manufacturing is not present. Hence 100\% inspection of the component is required. The personal needs of the operator are reducing the production rates. Because of the large amount of Manpower involved, the labor problem will also be high.

What do you mean by heat produced during cutting and its effects?

Heat generated during machining could result in the reduction of strength/hardness of the workpiece material, thereby lowered cutting forces. The reduction of cutting forces more often results a reduction of power consumption and an improvement in machinability of the workpiece material [14].

What is hot working in manufacturing?

Hot working refers to processes where metals are plastically deformed above their recrystallization temperature. Being above the recrystallization temperature allows the material to recrystallize during deformation. Many kinds of working, including rolling, forging, extrusion, and drawing, can be done with hot metal.

What is hot working and cold working?

Plastic deformation which is carried out in a temperature region and over a time interval such that the strain hardening is not relieved is called cold work. Hot working refers to the process where metals are deformed above their recrystallization temperature and strain hardening does not occur.

What is hot machining process?

Hot machining is the process which is used for easy machining and to eliminate the problems of low cutting speeds, feeds and heavy loads on the machine bearings. This problem arises when machining process is being done on the new and tough materials.

What is high speed machining (HSM)?

There are many definitions for High Speed Machining (HSM). MMSOnline uses the tagline “Achieving high metal removal rates with quick milling passes” for the HSM zone on their site.

How does high speed machining affect the temperature?

Somehow, high speed machining causes temperatures decrease beyond a certain spindle rpm! This chart is in meters/minute, so multiply the values by about 3 to get to SFM. For aluminum, we have a pretty good dip by the time we’re hitting 1000 SFM, for example.

Why turn the coolant in high speed machining?

The combination of a desire to activate the coating and the desire to avoid shock cooling delicate carbide (which causes it to crack and splinter) is why we may see a recommendation from the tooling manufacturer to turn of the coolant even when running at very high spindle speeds common for High Speed Machining.