- EXECUTIVE SUMMARY PROJECT CONTEXT ESCO Incorporated manufactures a variety of steel parts using a sand mold casting process. In this
process a clamping device is used to prevent the sand mold from leaking during the pouring process. The
current clamp design has several deficiencies including an uneven distribution of the clamping force,
mold damage caused by the engagement of the clamping device, and the manual disengagement of the
clamp. These factors result in defective parts and time delays in part manufacturing. The MIME capstone
design team 46.1 was tasked with creating an improved clamping device that would eliminate these issues
and increase profits for ESCO.
The team began the design process by analyzing the customer needs and developing corresponding
engineering requirements. The second step in the process consisted of researching a variety of clamping
designs and design components used both within and outside of the casting industry and evaluating them
according to how well they satisfied the required functions. Based on this information the team created
four different clamp designs. The four designs were then evaluated against the engineering requirements
and ranked in a decision matrix. The concept with the highest ranking was selected as the final design.
The clamp design selected for implementation, shown in Figure 1, is
based on two main components: a rack and pinion jack and an adjustable
steel footprint. The rack and pinion jack reduces set-up time by
combining the clamp height adjustment and clamping force application
with handle rotation. The force is applied smoothly, thus avoiding
damage to the mold. The adjustable footprint uses steel angle irons that
can withstand the high temperatures of the casting process and a slotted
connection to accommodate a variety of mold layouts. It also distributes
the required clamping force evenly. Finally, the design utilizes two
pinned connections that allow the clamping device to disengage
automatically from the sand mold.
IMPLEMENTATION AND TESTING
The team purchased the Rack and Pinion jack from a company in
Germany and purchased the remaining parts from local hardware stores.
Next, the team performed all of the welding and fabrication for each of
the components of the clamp at Oregon State University. The clamp was
then assembled and tested on a simulated sand mold. Load cells were
used to demonstrate the ability of the clamp to provide the necessary
clamping force as well as the force distribution. Additional tests on the
clamp were performed including: durability, setup time, maintenance,
sand mold clearance, and the ability of the clamp to auto disengage.
RESULTS AND RECOMMENDATIONS
The clamp design passed all of the tests. Based on the implementation and testing, modifications were
made to improve the functionality of the clamp. First, the team replaced the plastic handle on the jack
with an aluminum handle for increased durability. Second, the team added a sheet metal guard around the
bottom portion of the rack to prevent damage due to liquid metal splashing onto the rack. In the future,
the team recommends replacing the manually operated handle with an attachment that allows for a
pneumatic drill to reduce setup time. Additionally, the team recommends adding a torque wrench
attachment to the handle to provide a more consistent clamping force each time the clamp is engaged.
- description.provenance : Made available in DSpace on 2013-06-05T21:18:48Z (GMT). No. of bitstreams: 2license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5)Sand Mold Clamping - Final Report.pdf: 6307868 bytes, checksum: feb420cc8a5e0a921523287a2512eacd (MD5)
- description.provenance : Submitted by Benedikt Bochtler (bochtleb) on 2013-06-05T21:18:48ZNo. of bitstreams: 2license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5)Sand Mold Clamping - Final Report.pdf: 6307868 bytes, checksum: feb420cc8a5e0a921523287a2512eacd (MD5)