Why do you need to know the specific cutting force for a workpiece material?
Specific cutting force is a key parameter that is important for estimating cutting forces that occur during machining. This information is important for various applications. The most important application is estimation of the stability limit valid for the specific configuration of the machine tool, tool and workpiece.
Is the dimensional and positional relationship between the workpiece and the cutting tool?
Locating: the positional and dimensional relationship between workpiece and cutting tool. Locator: the device to establish and maintain the position of the workpiece in work holders such as jig and fixture to ensure repeatability of work holder.
What are the common materials used as base materials or workpiece?
Ferrous and nonferrous metals are the most common workpiece materials, and each metal has different properties and cutting tool compatibility. Non-metallic materials, such as carbides, ceramics, plastics, and composites, may require machining processes.
What is workpiece and cutting tool?
In the context of machining, a cutting tool or cutter is typically a hardened metal tool that is used to cut, shape, and remove material from a workpiece by means of machining tools as well as abrasive tools by way of shear deformation. The majority of these tools are designed exclusively for metals.
What is the cutting force?
Cutting force is the resistance of the material against the intrusion of the cutting tool. The force directions and amplitudes differ in different cutting processes such as turning, milling, drilling, etc. performed in manufacturing machines –often CNC (See Fig. 1-3 below for an example on turning).
What is specific cutting resistance?
It can be explained as the force, Fc, in the cutting direction (see picture), needed to cut a chip area of 1 mm² that has a thickness of 1 mm. The kc1 value is different for the six material groups, and also varies within each group.
What is meant by locating and clamping a workpiece?
Locating the workpiece is the first basic function of a jig or fixture. Once located, the workpiece must also be held to prevent movement during the operational cycle. The process of holding the position of the workpiece in the jig or fixture is called clamping.
How can we permit variation in dimensions of workpiece for handling rough casting?
If the pressure exerted by the cutting tool is likely to tilt upward one end of the workpiece, then the link construction as shown in Figure 4.1(e) should be used. It is suitable for rough casting and forging because it permits considerable variation in dimensions of workpiece.
What is the purpose of having different cutting tool material?
To achieve this properties the cutting tools are made up of different material. The material chosen for a particular application depends on the material to be machined, type of machining, quantity and quality of production.
What is meant by workpiece?
workpiece. / (ˈwɜːkˌpiːs) / noun. a piece of metal or other material that is in the process of being worked on or made or has actually been cut or shaped by a hand tool or machine.
What is material cutting?
Metal cutting is “the process of removing unwanted material in the form of chips, from a block of metal, using cutting tool”. A person who specializes in machining is called a machinist.
What is a cutting tool in metal working?
A cutting tool in metal working can be defined as “any tool that is used to remove metal from the work piece by means of shear deformation”. Frequently, it also refers as a tool bit. In order to perform effective cutting operation, the cutting tool must be made of a material harder than the work material to be cut.
What are the characteristics of a good cutting tool?
In order to perform effective cutting operation, the cutting tool must be made of a material harder than the work material to be cut. Also, the tool must be able to withstand the heat generated during machining process. The tool must have a specific geometry (known as tool geometry) for effective cutting and smooth surface finish.
How does the cutting speed depend on the diameter of the tool?
In the case of facing operations the cutting speed is proportional to the work diameter, the speed decreasing as the center of the piece is approached. Sometimes a spindle speed changing mechanism is provided to increase the rotating speed of the workpiece as the tool moves to the center of the part.
How to choose the right cutting tool for your application?
In order to perform effective cutting operation, the cutting tool must be made of a material harder than the work material to be cut. Also, the tool must be able to withstand the heat generated during machining process.
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