Fastener ๋ ์ผ EJOT ็คพ์์ ๋ง๋ ์ต๊ณ ์ Plastic ์ ์ฉ Screw ์์ธ์๋ณผํธ CO., LTD. ๋ํ๋ฏผ๊ตญ ์ ์ ๋ผ์ด์ผ์ค ์์ฐ ์ ์ฒด EJOT GmbH & Co. KG DELTA PT März 2003 Marketing TEL : 032-818-0234 FAX : 032-818-6355 ์ฃผ์ : ์ธ์ฒ๊ด์ญ์ ๋จ๋๊ตฌ ๊ณ ์๋ 645-8 ๋จ๋๊ณต๋จ 76B 9L Folie 1
1. DELTA PT thread is.. DELTA PT EJOT. 2. Characteristics further developed flank angles 30º 20º 140º 180º 4 1. optimised pitch / helix angle pitch / Tapping reinforced core diameter (PT THREAD improved head geometry (EJOT ( EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 2
3. Comparison DELTA PT vs PT PITCH PT DELTA PT DELTA PT PITCH 30º vs 60º vs TAPPING ( TAPPING EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 3
4. Benefits further developed flank angles DELTA PT 60 30º 60º. DELTA PT screw small flank angle DELTA PT Sheet metal screw 60 flank angle 60 EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 4
further developed flank angles - 30º. DELTA PT... EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 5
further developed flank angles - DELTA PT Hole-Ø high flank coverage minor contact pressure nearly stress-free assembly 0 Hole-Ø stress 60 thread: increased stress TORQUE cracking boss (BOSS EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 6
further developed flank angles - Hole-Ø Hole-Ø STRESS HOLE SIZE. DELTA PT : Displaced material is accomodated entirely by the thread core recess / shape high flank coverage minor contact pressure nearly stress-free assembly 60 thread: Displaced material does find sufficient space by increased hole diameter less flank coverage high contact pressure high relaxation EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 7
further developed flank angles -. F1 rad < F2 rad. F1 ax > F2 ax. EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 8
optimised pitch / helix angle pitch / PITCH thread forming head in contact without clamp load (installation torque T i ~. destruction of the joint (stripping torque T s EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 9
optimised pitch / helix angle pitch / - PITCH (M5.0 TAPPING(60 1.58 PITCH [ ] DELTA PT 1.80 PITCH PT 2.24 PITCH [ ] PITCH PITCH PITCH Helix angle EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 10
reinforced core diameter PT thread increased torsion and tensile strength DELTA PT PT DELTA PT increased dynamic safety PT improved heat transfer. EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 11
improved head geometry. ( TORX PLUS EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 12
5. Data Repeat assembly Stripping Torque Tightening Torque Loosening Torque Installation Torque Material: ABS Screw: EJOT DELTA PT 80 Hole-Ø: 5,80 6,30 Penetration depth: 17 mm 10 times repeat assembly with DELTA PT 80 screw Loosening Torque. EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 13
Fatique strength 10 force [kn] PT K 50 DELTA PT 50 TEST PT DELTA PT 1 1000 10000 100000 1000000 10000000 cycles Higher load capacity for the same number of cycles cycle PT 50% EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 14
Core diameter - Torsion and tensile strength (WN5461 part 2 size 12 16 20 30 35 40 45 50 60 80 100 min. breaking torque [Nm] 0,10 0,23 0,42 1,50 2,50 3,70 5,20 7,10 12,80 30,00 59,00 min. tensile load [kn] 0,56 1,06 1,60 3,80 5,20 6,80 8,60 10,00 15,00 28,00 44,00 app. 50 % improved minimum breaking torque and tensile strength compared with 30 flank angle screws for through hardened steel 30 50% EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 15
Pitch - Possible results Material: A GW P d h d i F c T t PA6 GF30 mm 2 mm mm mm kn Nm DELTA PT 40 35 1,46 3,2 11,75 2,4 2,9 DELTA PT 50 35 1,80 4,0 9,88 1,8 2,9 PT K 50 35 2,24 4,0 13,24 1,4 2,9 Legend: A GW = thread engagement P = pitch d h = hole diameter d i = penetration depth F c = clamp load = tightening torque T t reduced screw diameter reduced insertion depth increased joint strength SIZE PT SIZE SIZE EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 16
1 Core diameter( - Heat transfer( DELTA PT screw Using a smaller core, more friction heat is transferred to the plastic material increasing the possibiltiy of boss and material damage BOSS C 30 145 C C 59 C 88 C 116 C Using the DELTA PT more of the frictional heat is transferred to the screw (DELTA PT SCREW TORQUE SCREW. EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 17
6. BOSS Design recommendation Influence of counterbores Increased stress bad σ permissible Reduced stress STRESS σ permissible EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 18
bad Optimum part contact ( - Easy assembly START EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 19
Design recommendation ( BOSS Recommended boss eometry ( BOSS d 1 = nominal screw diameter d B = boss outside-ø d C = counterbore-ø d h = hole-ø d i = insertion depth Optimization by the EJOT prognosis program EJOT, SCREW RESINE. EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 20
7. Prognosis program Screw joint optimization Bauteilbelastungen bekannt? Ja Anfangsvorspannkraft festlegen Flächenpressung bekannt? Ja vorhandene Flächenpressung Nein Abschätzen Berechnen Nein Flächen ermitteln / Flächenpressung ausrechnen depending on: Admissible surface pressure Clamp load Operating load Nein Temperaturbelastung? Ja zul. Flächenpressung mit Abminderungsfaktor verrechnen vorh. Flächenpressung < zul. Flächenpressung? Ja Nein EJOT SCREW SPEC TOOL, USER. Anziehdrehmoment lt. Programm berechnen EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 21
8. Applications( EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 22
9. Results Cause Result BOSS TORQUE PITCH TORQUE EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 23
10. CO., LTD. [ ] SCREW SCREW SCREW NYLOK HDD CLEAN SCREW INSERT, PIN [ ] TORX PLUS, TORX SCREW - TEXTRON (USA DELTA PT, PT SCREW - EJOT ( [ ] : 1,217 / 1,424 ( : 86 2004 : 136 [ SUZHOU ] : 500 : 30 2004 : 25 EJOT GmbH & Co. KG DELTA PT März 2003 Marketing Folie 24