Portland Community College | Portland, Oregon

METALLURGY consists of the following modules:

Manufacture and Properties of Steel - Understanding the manufacture and properties of metals has become increasingly important to machinists during the past two decades. Study of metal properties and development of new alloys have facilitated reduction in mass and increase in strength of machines, automobiles, aircraft, and many present day commodities.

Heat Treatment of Steel – Heat treating is the process of heating and cooling a metal in its solid state in order to obtain the desired changes in its physical properties.

Testing of Metals and Nonferrous Metals - After heat treating, certain tests may be performed to determine the properties of the metal. These tests fall into two categories: Nondestructive and destructive testing.

Physics of Metal Cutting - Industry recognizes that, to operate economically, metals used in the manufacture of its products must be machined efficiently. To cut metals efficiently requires not only knowledge of the metal to be cut, but also how the cutting tool material and its shape will perform under various machining conditions.

Machinability of Metals - Machinability describes the ease or difficulty with which a metal can be machined. Such factors as cutting tool life, surface finish produced, and power required must be considered. Machinability has been measured by the length of cutting tool life in minutes, or by the rate of stock removal in relation to the cutting speed employed (depth of cut).  

PREREQUISITE SKILLS AND KNOWLEDGE:
MCH100  

The student will be able to understand and demonstrate the proper setups, uses and operations associated with industry standard processes for the manufacture, heat treatment and testing of metals/materials. The student also will be able to understand the theory and applications associated with the physics of metal cutting and the machinability of metals/materials.

This course is based on performance outcomes. The following performance outcomes are based upon established industry standards. The student will demonstrate knowledge and understanding by completing the following activities:

• In this module the student will identify six properties of metals; explain the processes by which Iron and Steel are made; and describe the effect of alloying elements on Steel.
• In this module the student will select the proper grade of tool steel for a workpiece; harden and temper a carbon-steel workpiece; and caseharden a piece of machine steel.
• In this module the student will explain the three methods of hardness testing; perform a Rockwell C hardness test on a workpiece; Perform Tensile strength and impact tests on a workpiece; Describe several nonferrous metals used in industry.
• In this module the student will define various terms that apply to metal cutting; explain the flow patterns of metal as it is cut; and recognize the three types of chips produced from various metals.
• In this module the student will explain the factors that affect the machinability of metals; describe the effect of positive and negative rake angles on a cutting tool; assess the effects of temperature and cutting fluids on the surface finish produced.

METALLURGY will be presented by means of audio-visual presentations, demonstrations, lab experiences, and research activities. The course activities and design emphasize the development of skills and knowledge outcomes prescribed by established industry standards. The identified outcomes will be achieved by means of individual and team activities.

POLICY - Student performance measurements are based on established industry standards. The various areas of study during the course will be evaluated by a variety of activities. Typical of those activities are the following;

1. READING ASSIGNMENTS - Information sheets, textbooks, journal articles and the learning resource center are potential sources of information that the student will reference as directed in the modules identified in the introduction. 

2. PRACTICE - Completion of tasks and projects identified in the reading assignments, information sheets, journal articles and textbooks. Students are required to complete practice activities with 100% competency.

3. SELF-ASSESSMENT - Checking and evaluating the students understanding and knowledge gained through the reading assignments and practices typically done through a practice evaluation.

4. LAB ACTIVITIES - Participation in structured laboratory exercises with the emphasis on developing skills or increasing expertise in the areas of study identified in the module packets.

5. FINAL ASSESSMENT - An assessment in the form of a written exam and/or practical application that addresses the subject areas identified in the module packets. Students are required to complete final assessment activities with 85% competency.

Machinery's Handbook

Technology of Machine Tools by Krar, Oswald, and St.Amand

Machine Tool Practices, by Kibbe, Neely, Meyer, and White

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