Precision design scheme for inner slider core pulling mechanism

Time：2025-08-09 08:19:13 / Popularity： / Source：

Following is a precision design scheme for inner slider core pulling mechanism of VCM base mold, combined with nano-level sealing requirements for system optimization:
Design specifications for inner slider core pulling system

Core parameter design table

Components	Key parameters	Standard value	Limit tolerance
Inner slider width	W≤0.3×mold cavity depth	4-6mm	±0.005mm
Guide rail clearance	δ=0.0015×slide length	0.003-0.005mm	>0.01mm stuck
Core pulling Angle	θ=arctan(H/L)+0.5° compensation	15°±0.2°	>18° bite
Preload force of pressure plate	F=1.2×melt pressure×projection area	8-12kN	<5kN leakage
DLC coating thickness	--	3-5μm	>8μm peeling

Note: Lever ratio design: shovel inclined plane length/slider stroke = 3:1 (labor saving ratio 200%)
Thermal expansion compensation: Δ=α·L·ΔT (copper tungsten alloy α=9.5×10⁻⁶/K)

Nano-level sealing interface design

1. Triple seal structure

Main seal layer:
0.05mm step height (tungsten nitride coating HV1500)
Sealing surface width 1.2mm (Ra≤0.05μm)
Secondary seal:
Micro-textured oil reservoir (Φ0.1mm×0.005 depth)
Filled with fluorine-based grease (temperature resistance 200℃)
Dynamic compensation:
Piezoelectric ceramic micro-displacer (compensation amount ±0.003mm)
Real-time pressure feedback control

2. Thermal deformation compensation scheme

Heat source location	Compensation measures	Effect
Slider body	Copper-molybdenum alloy insert (λ=180W/mK)	Temperature difference↓15℃
Guide surface	Micro-circulation cooling groove (Φ1mm)	Thermal deformation <0.001mm
Shovel slope	Graphene coating (μ<0.01)	Friction heat reduced by 40%

Precision drive system

1. Compound drive mechanism

Hydraulic cylinder (main drive):
◉ Cylinder diameter Φ8mm
◉ Stroke 15mm
◉ Pressure 35MPa
◉ Response time <0.1s
Lever boost system:
◉ Shovel slope angle 12°
◉ Power boost ratio 1:3.5
◉ Corundum coating (HV2000)
Position feedback:
◉ Magnetic scale resolution 0.1μm
◉ Closed-loop control accuracy ±0.003mm

2. Anti-interference design

Risk points	Solutions	Safety margin
PL surface sealing area	Slider retreat 0.2mm air-avoiding groove	0.05mm gap
Cooling water channel	3D printing conformal water channel	Distance from slider ≥2mm
Ejection system	Timing control delay 0.3s	Interference detection switch

Manufacturing process specifications

Process	Special requirements	Testing standards
Slider grinding	45° cross grain	Straightness 0.002mm/100mm
Guide rail matching	Blue point contact ≥85%	Sliding resistance <5N
Coating treatment	Multi-arc ion plating DLC	Film thickness uniformity ±0.3μm
Dynamic test	100,000 cycles test	Wear ≤0.003mm

Typical problem solutions

Failure phenomenon	Root cause	Corrective measures
Slider stuck	Uneven thermal expansion	Add copper-molybdenum alloy heat conductive inserts
Flash generation	Insufficient sealing surface fit	Preload force of pressure plate increased by 20%
Poor reset accuracy	Gap of lever mechanism	Replace piezoelectric ceramic compensation mechanism
Surface strain	Lubrication failure	Texture groove density increased to 500/cm²

Innovative technology application
Intelligent early warning system:
Embedded fiber optic sensor (monitoring strain & temperature)
AI predictive maintenance model (accuracy 98.7%)
Automatic compensation system (adjustment per mold ≤ 0.0005mm)
Nano-composite coating:
TiAlN/DLC multilayer structure (friction coefficient <0.02)
Self-repairing microcapsule technology (automatic repair of damage)
Design verification list:
Total stroke of slider = product undercut + 2mm safety margin
Sealing surface pressure ≥ 80MPa (LCP material requirement)
Cooling water channel ≥ 1.5mm from moving surface (leakage prevention)
Thermal deformation compensation verified by FEA (ΔT = 150℃)
According to this specification, following can be achieved:
Core pulling mechanism life ＞ 1.5 million molds (precision retention rate 95%)
Match clearance is stable at 0.003-0.005mm
Reset accuracy ±0.002mm (meets nano-level sealing requirements)

Gud Mould Industry Co., Ltd