遼字石油化工大學⊙ Analysis: If the number of the parts in a batch is small, the manufacturing process can be completed through 5 operations, which are shown in table 6-1 For the manufacturing of the same part, if the number of part is large, the operation 1 in table 6-1 can be divided into 2 operations a)facing and centering one end in an engine lathe by one operator b)transferring to another engine lathe for facing and centering the another end by another operator. table 6-1 the process of shaft manufacturing Operation No peration name Work place facing end. center drilling ends Engine lathe 2 Cylindrical Turning Engine lathe Key way milling Upright milling machine Cylindrical grinding Grinding machine 6 deburring Clipping table
Analysis: If the number of the parts in a batch is small, the manufacturing process can be completed through 5 operations, which are shown in table 6-1. For the manufacturing of the same part, if the number of part is large, the operation 1 in table 6-1 can be divided into 2 operations: a) facing and centering one end in an engine lathe by one operator. b) transferring to another engine lathe for facing and centering the another end by another operator. table 6-1 the process of shaft manufacturing
遼字石油化工大學⊙ 4. Operation Step: An operation step is the basic element of an operation. One operation step is defined as an operation that is completed under the condition when the surface to be manufactured the cutting parameters and cutting tool remain the same. When any of the cutting parameters is changed, it will become another operation 5. Cutting pass: When the amount of metal to be removed is large, several cutting passes may need to be carried out a cutting pass is a kind of operation step that is completed by a single type of tool to cut the same surface under the same cutting parameters
4. Operation Step: An operation step is the basic element of an operation. One operation step is defined as an operation that is completed under the condition when the surface to be manufactured, the cutting parameters and cutting tool remain the same. When any of the cutting parameters is changed, it will become another operation step. 5. Cutting pass: When the amount of metal to be removed is large, several cutting passes may need to be carried out. A cutting pass is a kind of operation step that is completed by a single type of tool to cut the same surface under the same cutting parameters
遼字石油化工大學⊙ 6. Operation position: In order to reduce the number of setups, a rotational worktable or fixture is usually used to make sequential machining in different positions possible from a single setup. The job performend in one position is called one operation position Demontration of operation, operation step, position and cutting pass
6. Operation position: In order to reduce the number of setups, a rotational worktable or fixture is usually used to make sequential machining in different positions possible from a single setup. The job performend in one position is called one operation position. Demontration of operation, operation step, position and cutting pass
遼字石油化工大學⊙ B Production Type and its impact on process planning 1. Production type: refers to the specialized classification of an enterprise in respect of a workshop, manufacturingline or group, work place, and so on. Generally, it can be classified into 3 types, which are, a)single Production The number of workpieces with different structure or different dimensions is only one at a time, or only in small quantity For example: heavy-duty machines, specialized machines and new products o)Batchs The number of the same products in one batch. Including small batch large batch and medium batch
B.Production Type and its impact on process planning 1. Production type: refers to the specialized classification of an enterprise in respect of a workshop, manufacturingline or group, work place, and so on. Generally, it can be classified into 3 types, which are, a) Single Production: The number of workpieces with different structure or different dimensions is only one at a time, or only in small quantity. For example: heavy-duty machines, specialized machines and new products. b) Batchs: The number of the same products in one batch. Including: small batch, large batch and medium batch
遼字石油化工大學⊙ c)Large quantity production: The quantity of each part being produced is large, and many work places often manufacture the same product, carrying out the same operations on each example of the product repeatedl For eXample: the manufacturing of vehicles, trucks and bearings 2. Impact on process planning Process planning are highly affected by the produciton type When the produciton type changes, the production organization and management, the layout of workshop and machine tools, the process method of the raw material, the manufactruing equipment, such as kinds of cutting tool, fixture and inspeciton tools and the technical level of the operators will also varied addordingly
c) Large quantity production:The quantity of each part being produced is large, and many work places often manufacture the same product, carrying out the same operations on each example of the product repeatedly. For example: the manufacturing of vehicles, trucks and bearings. 2. Impact on process planning Process planning are highly affected by the produciton type. When the produciton type changes, the production organization and management, the layout of workshop and machine tools, the process method of the raw material, the manufactruing equipment,such as kinds of cutting tool, fixture and inspeciton tools and the technical level of the operators will also varied addordingly