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Monitor mould making standard
1. Mould materials
classify according to component name material :
Front housing mould cavity: 2311 rear housing mould cavity
738
Mould core inserts 638 slide block 738
Mould cavity mesh inserts 738 mould core mesh inserts 638
Ejection die board S55C other die board S45C
Display tube square inserts Be-Cu(HR750) CRT screw spindle
Be-Cu(Hit75)
Pushing rod, pushing pipe SKD61 pouring spout sleeve£¨bottom£©
Be-Cu(Hit75)
pouring spout sleeve£¨top£© STD61(HRC52-55) separation board
Cu
Big guide sleeve Cu+C( self-lubrication guide sleeve) return
spring blue
Mould nameplate AL
2. Mould structure
2.1 Front housing£ºAdopt single-side slide block structure.
TV sets up to 20 inch adopt solid duct; TV sets equal to
and larger than 20 inch adopt air-padding forming. Air pin
intake and spout air intake can both be adopted. 2.2 Rear
housing£ºAdopt single side slide block structure.
2.3 Mould overall structure requirements£ºUnder mould normal
forming conditions, the pushing out or returning movements
of the mould can be clearly seen.
2.4 The dimension from the front housing cooling water to
the forming surface is 25mm. Distance between cooling water
is 50¡À5mm.
2.5 The distance between the rear housing cooling water
hole to the forming surface is not more than 30mm.
2.6 Big guide sleeve shall be fixed using the guide sleeve
retainer ring. Oil groove is not necessary to be machine
on the big guide pillar of the self-lubrication guide sleeve.
2.7 Spout sleeve length of the cooling flow pipe is within
65-70mm.
2.8 Spring shims shall be installed between the pushing
rod screw and the pushing block to prevent loosening of
screws. The external end is blocked with copper plug.
2.9 The pushing pipe spindle shall be used to prevent rotation.
¡°D¡± ¨Cshape edge-cutting rotation-prevention method shall
be adopted.
3. Spout type and spout sleeve
3.1Front housing£ºSpout location and shape are shown in
attached Figure 1 and Figure 2. The length of the main spout
passage normally should be less than 75mm. The spout sleeve
is divided into two sections: The upper part to match with
the moulding machine shall be hardened, material: STD61(Korea
designation£¬equivalent to Japanese SKD61)£¬HRC52-55£¬and
a spare part shall be made at the same time£»The lower part
shall be made by copper beryllium (Hitachi Hit75)£¬and cooled
down by circulating water separately. Appropriate sealing
rings adopt high temperature sealing rings.
3.2Rear housing£ºStraight spout is adopted for mould up
to 25 inch, and needle-valve hot flow passage system is
adopted for moulds equivalent to or larger than 25 inch.
4. Knock out system
Forced return and spring return act simultaneously.
Mould
structure details
Front housing
Exhaust channels are machined on ribs of front housing
side wall and top matching with the rear housing rabbet.
Copper beryllium inserts are made on four corners of the
front housing, depth measured from the rib bottom shall
be not less than 60mm.
The pushing pipe and spindle shall pass through nitrogen
treatment (v1000¡À100)£¬spindles up to §æ2 adopt SSB type,
spindles larger than §æ2 adopt S SA type. For details
please refer to attached figure 5.
Air intake method: It shall applies to intake both through
spout and air pin. Dimensions and position of the air
passage shall be determined according to practical situation.
Cross section shape and dimensions of the air passage
are shown in attached figure 6.
The sealing surface of the display tube is 25mm£¬non-sealing
surface takes 2mm£¬air holes are machined on each non-sealing
surface to be connected to mould outside. Please refer
to attached figure 7.
There shall be a clearance of thickness of one piece of
copy paper between mesh inserts of the fixed and movable
moulds. And the copy paper used during seat grinding shall
be kept for verification during mould acceptance inspection.
Each set of mould shall maintain four spares.
Mesh inserts shall be simple for assembling and disassembling,
convenient for maintenance. The mesh inserts of fixed
mould shall be assembled and disassembled freely without
disassembling of fixed mould base plate. Mould cavity
mesh inserts are higher than the mould cavity surface
by 0.1mm. The misalignment shall be uniform.
Processing requirements of mesh inserts:
¢Ù Electrode material£ºEDM3
¢Ú Electro-machining equipment£ºMAKINO
¢Û Electrode are processed using CNC£ºElectrode special
machining machine tool
¢Ü Discharging sequence and interval in electro-machining£º
Rough machining£¨0.3£©-semi-finishing£¨0.15£©-finish machining£¨0.07£©
¢Ý Electro-machining time£ºRough machining£¨2dyas£©-semi-finishing£¨3days£©-
finish machining£¨3days£©
¢Þ After treatment£º4 times of PIKEN electro-machining
or sand blasting and polishing
Mould cavity surfaces of key points shall trimmed by finish
machining using integral graphite electrode.
The distance between cooling water holes shall be not
more than 50mm. Inserts on the four corners of CRT adopt
Be-Cu (HR750)£¬spout sleeve is cooled individually.
Control key screw pillar is formed by pushing pipe.
Screw pillar to fix the display tube and pushing pipe
spindle for control key screw pillar adopt Be-Cu(Hit75).
In order to increase pushing pipe strength, during forming
of screw pillars with chamfers, the chamfers shall be
machined on the pushing pipe.
The matching length of pushing rod and push pipe is 2.5-3
times of the diameter of pushing rod and pushing pipe.
The length of all pushing pipe spindle shall be defined
according to 3D.
The size of spout shall be designed as §æ2.
The diameter of oblique guide pillar shall be not less
than 35mm.
Upward adjusting block shall be added in design of upper
spout for flow adjustment during trial moulding. Dimensions
of the flow adjusting block are shown in attached figure
8.
The diameter of the air pin must be 8mm. Korea standard
is adopted. Fixing dimensions of the air pin are shown
in attached figure 9.
Rear housing
Inserts shall be made on the four long ribs of the mould
cavity. And they shall be cooled down and mirror polished
separately. Be-Cu material is adopted.
The design of various letters shall be made according
to drawings. Same size shall be adopted on the same position.
Inserts shall be adopted on mould cavity at the exit for
power cable.
Cleavage line processing No.: STV20
