PRODUCT OVERVIEW ③ INSERT BLOCKS WITH GAS VENT –HARMONICA SHAPE–
INSERT BLOCKS WITH GAS VENT –HARMONICA SHAPE LARGE–
SUS420J2 equivalent
■ Overview
LBGV–X
● Features • Gas release groove (S) is processed on each plate. Specific number of each plate is combined to make Insert Block with Gas Vent which is fixed with bolts. (Fig. 1) • Even if resin or tar gets clogged in the gas–release groove, it can be easily removed by removing the fixing bolt (MSB) and disassembling during maintenance. • Gas as well as air is released from the groove of 0.03 or 0.05mm thickness, lower- ing flow resistance and improving moldability. • The vent surface can be processed according to the shape of molded products. (See Example) • Effective in releasing gas during mold processing in medium to large size molds. ■ For use • In BGV, groove thickness (S) can be selected. Select 0.03 for groove depth when resin has a high fluidity, and 0.05 when resin has a low fluidity. • Be sure to identify the bolt hole and tap hole (BGV only) on the inside of the cavity insert in the blueprint when processing the vent surface, to avoid problems. • Note that tapering on the vent surface enlarges the groove area and may cause clogging. • Please be careful about the mounting position because shape of the groove may appear on the surface of the finished product depending on the groove depth and resin. • This product achieves dimensional precision by performing the final machining in the shape of a block which is a combination of each plate with gas release groove. If disassembled, be sure to combine the plates in the original order and use it. You can identify the correct order at the time of assembling by the diagonal 0.1mm (approx.) depth V groove on the bottom of the insert. Slight imbalance may occur due to precision error in shoulder bolt and hole. Thus assembly should be done by adjusting the dimensions on a flat surface and tightening with bolts. Make sure to adjust in the same way at the time of delivery, after processing, after assembly, and before installation. • Each plate for BGV is raw material. Note that it will be damaged if struck or given a shock. ■ How to Mount • Insert into a section where gas tends to accumulate, such as final filling part. • Process the vent surface to suit the product shape, as necessary. • We recommend the addition of a relief groove in order to decrease resin clogging in the gas release groove. Ideally, a relief groove should be added by alteration of approximately 0.5–1.0mm thickness, leaving 5–12mm of the gas release groove section from the vent surface. (Fig. 2) • A/B dimension tolerances are positive. Insert into mold by actual fitting process. • A tap hole is added on the bottom of the cavity insert. It is for fixing the insert. (See Example)
Example
LBGV
Fixed side
Molding product
P.L
Movable side
■ Precision Standard • Squareness for A/B surfaces • Parallelism of upper and lower surfaces
Back plate
0.02mm or less for 100mm 0.02mm or less for 100mm
0 ＋ 0.03
B
20 10
0 ＋ 0.1 T
20
R ≦ 0.1
15
15
14
G
1.6
M6
Gas release groove
Fig. 1
Vent surface after processing
S 0.5–1.0mm
1
1.6
Gas vent groove 5–12mm
0 － 0.02 S
G
M Material H Hardness A Accessories
SUS420J2 equivalent
31–35HRC
Shoulder bolts (MSB) 2 pcs
Relief groove
Part Number
Number of plates
Number of grooves
Supplied bolts
Example 1. Machining a relief groove on the existing gas release groove.
S
B
T
Type
A
Gas vent groove
Vent surface after processing
S 0.5 – 1.0mm
70
5
21
MSB8–40
80
5–12mm
6
28
MSB8–50
100 120
LBGV–X
100
0.03
90
7
35
MSB8–60
Relief groove
100
8
42
MSB8–70
Example 2. Machining a relief groove on each plate parallel to the vent surface.
Part Number – B – T LBGV–X100 – 100 – 100
Quotation
Order
Delivery
Fig. 2 Insert Blocks with Gas Vent Example of relief groove addition
Part Number – B – T – (RC/CMK/BC) LBGV–X100 – 70 – 120 – RC6–BC
Alterations
出荷日 Delivery
Quotation
Alterations
Code
Spec.
Alterations
Code
Spec.
RC 0
R machining at 4 corners on A/B surfaces with normal R ≦ 0.1.
B
－ 0.2
10
RC
RC (Selection) 6 10 12
Mounting tap hole machining Machine the mounting tap holes for fixing at 4 corners of A/B surfaces.
BC
B 0
Changes the tolerance of A dimension and B dimension. A + 0.03 0 c A 0 –0.03 B + 0.03 0 c B 0 –0.03
－ 0.03
CMK
Size: M8 Depth 15
443
444
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