Coolant Delivery System for Creep-Feed Grinding - Mechanical ...

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Dalhousie University MECH 4010 – Design Project I – Fall Term Report 3.0 Design Options After receiving the design requirements, it was required to develop a system that would meet or exceed these requirements. Brainstorming was performed and various ideas for the system were developed. The following section will describe two separate designs that were considered during the brainstorming sessions, but were found to be unsuitable designs and therefore, they were not selected for this application. This will be followed by a detailed description of the chosen and final design. The first considered design was a system with a single pump and motor that would provide the coolant to both the cleaning and coolant side of the grinding machine by dividing the flow. This design was one of the initial ideas and it was considered due to its simplicity. It was initially thought that it would be easiest to have one pump and one motor, similar to the current system, but to provide greater flow and pressure. The new pump would provide flow through one line which would be split into two separate lines using a valve or flow divider. The line providing the coolant to the coolant/lubrication side of the system would use the majority of the flow while the line providing the coolant to the cleaning side would only require a small flow. The motor for this design would be similar to the existing motor, which is a three-phase electric AC motor but would require a greater horsepower rating required by the pump to achieve the desired pressures and flow rates. The pump would be one that could provide a maximum of 1000 psi and have a flow rate of 15 US gallons per minute (gpm), which as mentioned above would be divided such that the coolant/lubrication side would receive approximately 13 gpm and the wash side would receive approximately 2 gpm. This system would be as shown in Figure 3.1. 9
Dalhousie University MECH 4010 – Design Project I – Fall Term Report Wash Side Figure 3.1 – System Schematic # 1 The second design that was considered was a system with multiple small rotary vane pumps that would have to be mounted in series to achieve the desired pressures. This design was considered because it was found that rotary vane pumps are reliable and inexpensive. They are also very small in size; therefore, having numerous pumps was assumed to not be a problem for space requirements. This design would consist of one motor driving two separate pump systems to provide the coolant to the coolant/lubrication side and the wash side separately. The motor would again be a three-phase electric AC motor with a horsepower rating to meet the requirements of the pumps. Each rotary vane pump would be capable of providing a pressure of up to 250 psi and a flow rate of up to 11 gpm. The pumps would have to be placed in series to achieve the desired system pressure of 1000 psi. Therefore, with the 250 psi maximum provided by each pump, a minimum of four pumps would be required to achieve the 1000 psi for each side. The pumps would provide a flow rate of approximately 11 gpm for the coolant/lubrication side and approximately 2 gpm for the wash side. A series of pulleys would also be required to drive all of the pumps with the one motor. The system is shown in Figure 3.2. 10 Coolant Side
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