1) The Grinding Machine
A grinding machine uses an abrasive wheel as a cutting tool to shape or change the dimensions of a hard material. The type of materials that need grinding are usually metallic items such as tools and rods. These machines generally work by reducing the material through abrasion. Grinding is used to finish workpieces that must show high surface quality and high accuracy of shape and dimension. There are several main parts in this machine. These parts are shown as below. Picture
Bed or base
2) Find the ribs and the reasons
There are two types of ribs. These one are the longitudinal support ribs design. Stiffeners used in the arrangement provide significant movement in the bending and torsional stiffness of box-type structures. The stiffeners of open structures, such as grinding beds, which consists of vertical shears connected by ribs also depends to a great extent upon the arrangement of stiffeners. The bending as well as the torque resistance of frame components may be improved by the provision of strengthening rib. 3) Find the holes and gives the reason
There are some holes in this machine tool. These holes provide their own function. The picture below will explain about the function of every holes that exist in this grinding machine. Hole
The main purpose for this hole is to make the joint or connection by using the screw. As we know, the joint between the part is very important for the machine rigidity.
A hole is needs to transfer the flow of the liquid that use in this machine. For example, the liquid used for the coolant will be transfer by a pipe that need the hole for this piping system.
This machine required electricity as the main source energy. So, this hole is very important to create a hole for the installation of the wiring system.
This hole is function as the flow of hot air.
The heat is exposed during this machining, so the air flow out for the hot air is very important and can act as one of the cooling system.
4) Find all guideway for different movements and the force-flux between them and the MT body
a) For X-axis guide-way: Double vees type
b) For y-axis guide-way: One flat and one vee type slide-way
c) For z-axis guide-way: By referring to the machine manual the type of guide-way is double vees
d) the force-flux between them and the MT body is assumed as in figure below
5) Explain different loading source for the machine tool (static,dynamic,heat) A static load is the effect of gravity on an object or structure. Meanwhile a dynamic load is the forces that move or change when acting on a structure. What are static loads?
Weight of work
Weight of machine components
Source of static load:
Friction lossen in guideway
Friction losses in the feed of drive bearing
Cutting force acting in feed direction of the table
Source of dynamic load:
Dynamic torque to accelerate the table, workpiece, and lead screw assembly. It also applies in gears, motor and shaft. Changing in the depth of cut and stock removal
Vibration because of intermitted cutting by multi edge cutters Heat sources in machine tool:
Main heat source:
Gear and hydraulic oil
Drives and clutches
Pumps and motors
Cutting action and swarf
External heat source (environment)
Friction in between tool and workpiece:
If the temperature generated by friction is high, the guides will undergo thermal deformation. To take out the heat generated, it is necessary to flood the guiding surface with lubrication oil
6) Find the joints and discuss about their rigidity
In the grinding machine, there are 2 types of joint are used which are bolt and nut and welding. Bolt and Nut Joint
This type of joint is a common temporary joint that uses a bolt and screw to connect two parts. The size of the bolt is...
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