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Technologie
Plastic has become a permanent part of our every day life. Modern synthetic materials shape our world in all areas and lines of business (automotive industry, electrical engineering/electronics etc.)
For no other material does the expression ”success through innovation” apply to such an extent as for plastic. The theme of recycling can be taken into account here as well. Plastic Into Plastic is a modern technically pentect fixing solution.This plastic screw allows strong, self-locking joints to be made between plastic components.
- recyclability
- weight saving
- corrosion resistant
- electromagnetic compatibility (EMC)
- self locking
- chemical resistant
- temperature steady up to 160° C
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Principle
The screw creates its thread even in the cylindrical bore hole because of the geometry of the thread and the design of the cutting edge. It is made up of high tensile plastic filled with glass-fibre. This is characterised by high chemical resistance and Iong-term temperature whilst in use of 150° C. A safeguard against unscrewing is achieved by the relaxation of the carrier material in the spline of the screw. |
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Applications
- materials susceptible to stress cracks
- PA*, PE*, PP* (even made of PP GF*) and PA 6.6 GF* (up to 35%)
- foam rubber e.g. PUR HIS 1050 kg/cm3 density
- wood based materials and GMT* (thermoplastic reinforced with glass-fibre matting).
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| Application examples
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Varianten
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| diameter of thread: | M6, M7 and M8 mm with modified knuckle thread |
| length of thread: | in accordance with the circumstances of installation |
| shape of head: | in accordance with DIN 7085 with cross notch, multifunction head |
| materials: | high tensile plastic filled with glass fibres, standard
design: PPA GF* |
| colour: | black |
| special feature: | Self-adjusting locating ribs have been designed for
receiving transverse load of components that have to be mounted. |
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Strength values
| Extracts from various test reports on strength testing |
Plastic |
Screw |
round thread |
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Location |
hole |
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D |
mm |
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Thread |
length |
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mm |
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Tightening |
torque |
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ME* |
Nm |
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Overturn torque |
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MÜ* |
Nm |
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Axial pull-out force at corresp. |
tightening torque MA |
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MA* | F |
Nm | N |
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Ø 6 x 18
material
PEI – GF | PA6.6-GF30 | 5,4 | 12 | a = 0,77 | 22,10 to 2,20 | 1,30 | 11240
to
1590 |
Ø 7 x 14
material
PPA – GF | PUR
60 Shore D | 6 | 12 | a = 1,20 | 21,8 to 2,40 | 1,30 | 21046 |
Ø 7 x 14
material
PPA – GF | PP | 6 | 9 | a = 0,65 | 22,10 | 1,25 | 21447
to
1668 |
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1 Screw fracture
2 Screw OK, thread in parent material collapsed | *) insertion force n=300 min-1 |
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Unscrewing torque in repeated assembly for X 7 x 14 in PP parent material
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| 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th |
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| 0,67 | 0,69 | 0,64 | 0,59 | 0,58 | 0,58 | 0,58 | 0,55 | 0,53 | 0,54 |
| Tightening torque | MA | *) | (Nm) |
| 1,25 | 1,25 | 1,25 | 1,25 | 1,25 | 1,25 | 1,25 | 1,25 | 1,25 | 1,25 |
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| 2,63 | 2,28 | 2,32 | 2,34 | 2,20 | 2,16 | 2,24 | 2,15 | 2,24 | 2,21 |
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Screw and threaded hole were undamaged after the 10th assembly cycle.
The above torque values ME and ML are arithmetically averaged over 3 measurings. |
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Rotary friction welding with the plasic screw
Rigid, glass fibre-reinforced materials (thermoplastics) can be bonded to the screw reliably, gas and liquid tight, with this process. With a fast rotation speed and high pressure (total bonding time less than 2 seconds), a high-strength joint is produced between two plastics, offering substantial economic advantages. | |
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Strength testing – insoluble assemblies with rotary friction welding
| Extracts from various test reports on strength testing |
Plastic
Screw
round thread | Parent material | Location hole
D | Welding time
sec | Axial pull out force
F
N | Note |
Thread in screwed
part
mm | Upper part
mm |
Ø 8 x 25
material
PPA – GF | PA6.6-GF35 | 6,7 / 6,5
conical | 6,8 | 0,4 | > 3000 | < 3200 N Screw weld fracture
> 3200 N Screw and weld fracture |
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Ultrasonic Welding – Type 163
The threaded insert consists of plastic containing a high concentration of glass fibres and is welded after the removal from the mould of the component (after moulding). The conical shape of the insert and the bore hole required to receive it guarantee the centred seating of the insert. During welding the insert forms a homogenous joint with the component. Component and insert do not have to be expensively separated any more.
It is particularly suitable for installing in materials that are prone to stress cracks as well as in materials that are non-thermoplastic e.g. GFK*, SMC* etc. (clawing polymer).
- stress free installation
- high rigidity of thread
- high resistance to pulling out
- shont welding times (approx. 0.3 seconds)
- very small amount of noise emission during welding process
- homogenous joint between insert and component
- no corrosion
- saving of weight
- saving in costs
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| | Location hole |
more about this product you can find in our product range under “Thread Inserts for Plastics AMTEC®” in the section “Joining methods” | |
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Selfcutting insertion - Type 173
The threaded insert consists of plastic with a high concentration of glass fibres and is screwed in after the removal from the mould of the component (after moulding). This threaded insert creates its own receiving thread in the cylindrical bore hole of the component because of the outside diameter of the thread (which expands radially).
The thread offset creates a Iocking device to prevent Ioosening and thus a reliable forced fit for the insert.
The component and the insert can both be reduced in size and separated by simple means. In the case of identical or ”related” materials the necessity for separatinq the materials is dispensed with.
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| | Location hole |
more about this product you can find in our product range under “Thread Inserts for Plastics AMTEC®” in the section “Joining methods”
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TEPRO® threaded inserts type 173
as special solution (press stud version) |
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Product film