EXPANDABLECAVITY SYSTEMS Applications Engineering Quote Request Form
EXPANDABLE CAVITY SYSTEMS Plastic Part Design
QUOTE FAX HOTLINES AVAILABLE or email customer_service@dme.net United States 888-808-4363 • Canada 800-461-9965 • International 248-398-7394
The Expandable Cavity was designed to produce external details. All commonly used thermoplastic molding polymers, including filled materials and engineering polymers, have been successfully molded with the Expandable Cavity. When using a corrosive polymer such as PVC, the Expandable Cavity must be surface treated with a protective coating. To prevent loss of expansion properties in the Expandable Cavity, the surface treatment process should not exceed a temperature of 600° F. Good plastic design practice should be observed to avoid such conditions as distortion, sink marks, etc. These problems and their solutions are identical to those found in conventional moldings. All undercuts, protrusions, windows, etc. will typically include two to five degrees of draft. The bottom edge of the part must also have approximately two to five degrees of draft. Also, if molding is required on the top of the Expandable Cavity, two to five degrees of draft needs to be included. This is necessary because the segments flex radially away from the molding position in an arc. The draft allows the segments to expand freely. NOTE: The amount of draft varies with tool design. Changes in tool design (length, body diameter, etc.) can minimize draft requirements.
QUADRANT 1 O-RING GROOVES
QUADRANT 2 PROJECTED SHAPES
Company name:
DME account #:
DME EXPANDABLE CAVITY SYSTEM
Contact name:
P.O. #:
Phone:
FAX:
Address:
E-mail:
City:
State/Province:
QUADRANT 3 1 3/16-16 THREAD
QUANDRANT 4 DME
ZIP/Postal Code:
Country:
SHIPPING METHOD: UPS Ground
0.125 x 0.125 x 0.05 2° to 5° DRAFT
Other __________________________________
UPS 2nd Day Air
UPS Next Day
FedEx
Expandable Cavity Requirements I. POLYMER SPECIFICATIONS: A. What is the material to be molded? B. What is the process temperature ?
Filled
Unfilled
Glass
Mineral
II. DIMENSIONS OF EXPANDABLE CAVITY: (Part print is required) A. Specify largest diameter to be molded B. Specify smallest diameter to be molded
1 3/16 -16 THREAD MAJOR DIAMETER 1.20” MINOR DIAMETER 1.10”
C. Specify major diameter of undercut or thread D. Specify minor diameter of undercut or thread
2° to 5° DRAFT ON ALL PROTRUSIONS AND UNDERCUTS
III. MOLDED PART LENGTH: A. Molding Length:
(Within the Expandable Cavity)
.200
B. Mold Shut-off:
(Shut-off land below part)
IV. EXPANSION REQUIREMENTS: (See Expandable Cavity and Striker Insert Design) A. Critical Expansion per side: B. Loss of expansion (.050in/in): Multiply molding length (Distance from top of Expandable Cavity to bottom of last undercut) by .050in C. Clearance (Air) between plastic and steel upon expansion: .005
2° to 5° DRAFT
V. MOLD LAYOUT
A. Distance from gate (center to center): B. Number of cavities: Retrofit New Mold
NOTE: Demo part has four (4) different quadrants of detail (call DME for a sample).
106
107
U.S. 800-626-6653 ■ Canada 800-387-6600 ■ dme@milacron.com ■ www.dme.net ■ store.dme.net
U.S. 800-626-6653 ■ Canada 800-387-6600 ■ www.dme.net ■ store.dme.net
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