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Electric Unscrewing Device

  • The highest precision & process reliability
  • Shortest cycle-times & highest availability
  • Clean & oil-free operation (suitable for cleanrooms)
  • Maintenance friendly design – long service intervals
  • Compact design

Features

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The Clean Solution

Full electric – No Oil – No Leaks. Perfect for Clean Room Facilities.
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1 or 2 Gear Box Levels

Systems designed to meet the need.
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See It In Action!

Check out video of this device.
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Contact DME

For more information click here.

Purchase on DME eStore

Featuring the

High-performance Servo Unscrewing Devices for Multi-Cavity Molds

Servo unscrewing devices are DME’s answer to the demands made on high-performance injection molds with unscrewing functionality.
iMold-SUD-withbelt-photo-1

The Clean Solution
for Your Injection Molding Tool.

Oil and leak free unscrewing solutions for your production – Clean Room Suitable!
Specifications
Electric Servo Drive motors
1x to 96x unscrewing concepts
clean-room-medical
iMold-SUD-withbelt-photo-3

Front view 32x unscrewing half

iMold-SUD-withbelt-photo-2

Back view 32x unscrewing half

See It In Action!

Clean and efficient, this unscrewing device is perfect for Clean Room needs and much more.

Featuring

Threaded core, guide thread nut and cooling insert with sealing can be dismantled for inspection or maintenance on mounted mold from the parting line.
28b_32-unscrewing-device

Threaded core, guide thread and cooling insert with sealings.

System Design

1 gearbox level or 2 gearbox levels

The servo unscrewing devices can be constructed, depending on the requirements, with one (1) or two (2) gearbox levels, and is based on the following parameters:

  • Number of cavities
  • Thread size and length and thus maximum breakaway torque
  • Cavity spacing and arrangement of the cavities
  • Required unscrewing speed

System design is typically handled by project engineers, taking into account the technological possibilities and complying to the customer requirements.

Overview of device includes:

  1. Ball cage
  2. Threaded core or threaded sleeves
  3. Guide nut
  4. Guide thread
  5. Servo multi-drive SMA
  6. Gearbox level 1 with spur wheel
  7. Gearbox level 2 with timing belt disc, pinion shaft and driving pinion
  8. Motor plug

 

Gearbox-overview-unscrewing-device-numbered

System Design 1 Gearbox Level

In servo unscrewing devices with one gearbox level, several spur wheels are driven by a central pinion shaft RZW. For the design of the system by our project engineers the following information (if available) is needed and applied:

 

Plastic part

  • Thread diameter and length
  • Wall thickness and calculated shrinkage
  • Type of plastic and fillers

Injection mold

  • Maximum tool size and tool height
  • The number, layout and desired distance of the cavities
  • Threaded cores with cooling

Process

  • Mold and melt temperature
  • Unscrewing time and overall cycle time
  • Cleanliness level (clean zone, clean room)
30c_sam050060-gearbox

The following figure illustrates arrangement examples of systems with one a single level of gears.

 

  • The cavities can be arranged in a square, rectangular or circular pattern
  • Execution of the threaded cores and optional cooling according to customer specification:
  1. Servo Multidrive SMA
  2. Servo timing belt unit SZE
  3. Clamping plate LMP
  4. Spur wheel STR
  5. Pinion shaft RZW
  6. Threaded core set
  7. Cooling option RKE
sample-scope-1-red

The following figure illustrates arrangement examples of systems with one transmission level.

A-C-drive-options
A = Driving pinion shaft RZW – B = In-between pinion RTZ – C = Spur wheel STR
drive-options-red
  1. 4x symmetrical
  2. 4x asymmetrical
  3. 6x symmetrical
  4. 8x asymmetrical
  5. 8x symmetrical
  6. 8x asymmetrical
  7. 8x asymmetrical
  8. circular

Note: This circular arrangement of pinions is perfect for very compact, high cavity mold design. This can be accomplished with only one gearbox level (8x, 16x). The gating is done with MoldMaster’s Melt Disk.

Sample (Scope of delivery) System Components 4x SAM

Overview of device includes:

  1. 4x Spur wheel STR incl. bearings
  2. 1x Pinion shaft RZW incl. bearings
  3. 4x Clamping plate LMP
  4. 1x Servo multidrive SMA
  5. 1x Servo timing belt unit SZE
  6. Plus 4x threaded core set
  7. Plus 4x cooling option
  8. Plus 4x ball cage option

 

sample-scope-2a-red

System Design 2 Gearbox Levels

In servo unscrewing devices with two gearbox levels, several pinions in 2nd gear level are driven by a central pinion shaft RZW.

These are coupled with the pinion shafts of the first gearbox level which are driving several spur wheels.

Our Design Engineers can help determine the optimum system configurations for your application using the following parameters:

• Plastic Part     • Injection Mold        • Process

 

  1. 1st gearbox level
  2. 2nd gearbox level
34b_32-gearbox-2-red

The following figure demonstrates the standard setting for the system design with two gearbox levels.

 

  • The cavities can be arranged in a square, rectangular or circular pattern.
  • Execution of the threaded cores and optional cooling according to customer specifications.
  1. Servo-Multidrive SMA
  2. Servo timing belt unit SZE
  3. Clamping plate LMP
  4. Spur wheel STR
  5. Pinion shaft 1 RZW-1
  6. Pinion RTZ
  7. Pinion shaft 2 RZW-2
  8. Threaded core set
  9. Cooling option STI
30c_sam050060-gearbox-2-red

The following figures illustrates arrangement examples of systems with two levels gears.

A-B-drive-options
A = 1st gearbox level – A1 = driving pinion shaft RZW-1 – A2 = in-between pinion RTZ – A3 = spur wheel STR – B = 2nd gearbox level – B1 = main pinion shaft RZW-2 – B2 = pinion RTZ
drive-options-2-red
  1. 16x symmetrical
  2. 24x asymmetrical
  3. 32x – circular
  4. 2x – 8×4 rows

Note: This circular arrangement of pinions is perfect for very compact, high cavity mold design. This can be accomplished with only one gearbox level (8x, 16x). The gating is done with MoldMaster’s Melt Disk.

Sample (Scope of delivery) System Components 16x SAM

  1. 16x Spur wheel STR incl. bearings
  2. 4x Pinion shaft RZW-1 incl. bearings
  3. 4x Pinion RTZ
  4. 1x Pinion shaft RZW-2 incl. bearings
  5. 16x Clamping plate LMP
  6. 1x Servo-Multidrive SMA
  7. 1x Servo timing belt unit SZE
  8. Plus 16x threaded core set
  9. Plus 16x cooling option
  10. Plus 16x ball cage option
34b_32-gearbox-2b-red

Standard & Special System Sizes

Servo unscrewing devices „multi“ (SAM) are available in many standard system sizes. The base forms a 4-fold arrangement of the spur wheels STR, which can be extended by multiple arrangement.

 

  1. SAM120144 Z44 M3,00
  2. SAM080096 Z44 M2,00
  3. SAM060072 Z44 M1,50
  4. SAM050060 Z44 M1,25
  5. SAM040048 Z44 M1,00
  6. SAM030038 Z36 M0,90
  7. STR Z20 M1,50
  8. STR Z24 M1,00
  9. STR Z32 M0,70
system-sizes-red
Note: Custom sizes on request!

Want to Know More!

Reach out to DME today.

For all inquires please contact DME at:
[email protected]
Toll-free U.S. – 800-626-6653
Toll-free Canada – 800-387-6600
Worldwide – 248-398-6000
[email protected]

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