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1/20 Page No.: 69/292

Title: The Undercut Releasing System

Rev.: A

Created by: **** Approved by: **** Last Modified: 3.25.05

1.Slide 1.1 used for the molding of undercut area 1.2 the different steel should be used whenever possible;otherwise nitride hardening

treatment needed. 1.3 general guideline: 1.3.1 try to minimize dim. A; 1.3.2 B 2/3H, higher the center of mass; 1.3.3 10o E25o 1.3.4 F>E,the minimum difference 3o ,r=0.063~0.125; 1.3.5 diameter of angle pins: 3/8,1/2,5/8,3/4,1-1/4,excluding 7/8,chamfer preferred at the end; 1.3.6 minimum 1/8 added to required travel and one operation diagram needed; 1.3.7 C=0.6H or 0.6L,the larger,the better.

1.4 Recommended design data(inch):

L Slide Length L 6 5 4 3 2.5 2 1.5

H Slide Height H 6 5 4 3 2.5 2 1.5

A Guide fixed Height 1/3H 2 1.63 1.32 1 0.82 0.69 1.6

B Guide Height 2/3H 4 3.32 2.68 2 1.68 1.32 1

C Guided Length 6H OR 6L 3.6 3.0 2.4 1.8 1.5 1.2 0.9

Kwik-Mold Inc. Moldmaking Guide

Dim. C being the length of slide if the weight of slide pin is less than 20% oftotal weight.


2/20 Page No.: 70/292

Title: The Undercut Realeasing System

Rev.: A


1.5 Two angle pins and another guide rail centered are employed when Dim.

Z is above 4-1/2.

1.6 the contact point should be lowered for smooth running.

1.7 the delayed slide move can be acquired by increasing the clearance

between angle pin and slide,which is very usefull when the parting sequence is

needed.


Contact point


3/20 Page No.: 71/292


Rev.: A


1.8 the design of heel block

1.8.1 the wear plate should be

used when the most of slide(>2/3) is

buried into cavity side.wear plate is

fixed directly to moldbase with a

thickness of 1/4 .

1.8.2 the style depicted in the

left diagram used when the most of

slide(>2/3) is buried into core

side.the key features are the

clearance and backup area(needed

when an higher injection pressure

expected).

1.8.3 the style depicted in

the left diagram used when an

smaller injection pressure

expected.



4/20 Page No.: 72/292


Rev.: A


1.9 the wear plate design

1.9.1 used for the easy repair after wearing out.

1.9.2 material: (1) 0-1 ST'L 54~56HRC (2)Lamina Bronze (3)thickness (6.35mm)

1.9.3 wear plate used where two components move against each other.

1.9.4The width of std. component :3/4,1,1-1/4,1-1/2,2,2-1/2,3 and 4.the oversized

wear plate must be redesigned as following:

1.10 the guide rail design

1.10.1 used for guiding the movement of slide and repair when wearing out.

1.10.2 Material: AISI 01 or DIN1.2510 ,54~56HRC.

1.10.3 Lubrication oil slot added to all the guide rail and wear plate.(SP-00-02.24)

when AISI 01 used.



5/20 Page No.: 73/292


Rev.: A


2. retaining of slide at end of stroke

(i)compression spring;

(ii)plunger;

(iii)DME slide retainer;

(iv)SUPERIOR slide retainer.

2.1 compression spring 2.1.1Used in the following condition:

1. slide located in the up position(left diagram); 2. slide pins; 3. ejector pins placed under slide.



6/20 Page No.: 74/292


Rev.: A


2.1.2 the position of compression spring

(1.) located in the slide(as depicted in 11.1.1);

(2.) located externally if slide stroke is greater than 2;

(3.) located under the wear plate.

15

2.1.3 refer to Spring section for the selection and usage of spring.


Clearance needed


7/20 Page No.: 75/292


Rev.: A


2.2 Plunger

11.2.1 Plunger used for the slide that is less than 6.5 LBS.

11.2.2 used for the slide located in B,C,and D,excluding A;

11.2.3 plunger size should be above #10-24 and M4.

Dia.(inch/mm) 1/2 /13 3/8 /16 5/16 / 18 1/4 /20

Weight of slide(LBS/Kg) 6.5 / 3.0 5.5 / 2.5 5.0 / 2.3 4.0 / 1.8



8/20 Page No.: 76/292


Rev.: A


2.3 DME slide retainer

11.3.1 select the retainer per the weight of slide;

11.3.2 used for the slide located in B,C,and D,excluding A;

Model A Weight of Slide

PSL0001 1.5 22LBS/10KG

PSL0002 2.13 44LBS/20KG

PSL0003 3.38 88LBS/40KG



9/20 Page No.: 77/292


Rev.: A


2.4 SUPERIOR slide lock

11.4.1 used for the slide located in B,C,and D,excluding A

Model Weight of Slide

SLK-8A 8LBS/3.6KG SLK-25A 25LBS/11KG SLK-50A 50LBS/22KG



10/20 Page No.: 78/292


Rev.: A


3. The hydraulic cylinder should

be employed when the effective

length(H) of angle pin is greater than

7.



11/20 Page No.: 79/292


Rev.: A


4. The early ejector return

4.1 The early ejector return used when ejector pins placed under the slide. Two

kinds of machanisim used: (i)round bushing unit; (ii)safety pin.

4.2 round bushing unit


Mold Closed


12/20 Page No.: 80/292


Rev.: A



Early ejector have just contacted the elasticity ring


13/20 Page No.: 81/292


Rev.: A


4.3 safety pin

The ejection system cant be pushed forward before the slide is fully retracted.


Safety Pins


14/20 Page No.: 82/292


Rev.: A


5. the design and fixing of slide pins

.

6.the following design used when releasing the round undercut and every

part has one pairs in the multi-cavity mold.


5.1std. harden pins used

5.2 std. harden pins may be

used

5.3 unacceptable:

Aligning Feature Chamfered to ease the assembly


15/20 Page No.: 83/292


Rev.: A


7. the effective length of leader pin adjusted :

See leader pins & alignment part section for details.



16/20 Page No.: 84/292


Rev.: A


8.the design of lifter

8.1 Used for the internal undercut releasing;

8.2 the steel for main block and lifter should be different:

8.3 the fitting clearance needed for the nitriding;

8.4 three design styles used;

8.5 Bronze retaining block located on the back side of B plate need for smooth

operation of the longer lifter.

8.6 the fitting length is greater than two times of the lifter travel.

8.7 Design I

Main Block Lifter H-13 48~52 HRC S-7 54~56 HRC

S-7 54~56 HRC H-13 48~52 HRC(nitriding)

420 SS 48~50HRC H-13 48~52 HRC(nitriding) 420SS 50~52 HRC(nitriding) 440SS 56~58 HRC(nitriding)

P-20 35~38 HRC H-13 48~52 HRC(nitriding)


Fitting length

Bronze Retaining Block

Dowel Pin

Footer added to lifters which cant meet the demand mentioned in 17.6

Design I


17/20 Page No.: 85/292


Rev.: A


8.8 Design II

1. two similar styles as following:

2. the minimum angle between section C and section a is 1~2.


A(Lifter)

C(Actuator)

(Retainer)

Bronze retaining block


18/20 Page No.: 86/292


Rev.: A


8.9 Design III(referring to PCS for more detailed guideline)



19/20 Page No.: 87/292


Rev.: A


8.10 Design IV(referring to DME for more detailed guideline)



20/20 Page No.: 88/292


Rev.: A


8.11 The lubrication oil slot

8.11.1 used for decreasing the wear of moving component. 1.slot size: 0.50 X1.0~2.0(DepthX Width). 2. oil slot should be a closed profile. 3. the minimum radius 0.30mm. 4. the number of oil slot kept to a minimum. 5. The lubrication oil cant exposed to plastic part space.


Oil Slot

Slot Section

Datum for machining

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