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Ball screw specification selection for injection molding machines is highly dependent on machine tonnage. Different clamping force tonnages correspond to distinct load, speed and precision requirements, determining ball screw diameter, lead and precision grades. Unmatched specifications cause abnormal operation and premature screw damage. This article provides a complete tonnage-based selection chart covering precision, dimension, load and applicable models, enabling fast and accurate ball screw selection.
1. Selection Preconditions
This chart mainly applies to core transmission shafts of electric injection molding machines. Hydraulic machine auxiliary positioning shafts can refer to the minimum specifications of corresponding tonnages:
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Machine Tonnage: Refers to injection molding machine clamping force, determining screw load demand;
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Precision Grade: C3/C5 for precision molding; C5/C7 for standard molding;
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Diameter & Lead: Diameter determines load capacity; lead determines operating speed;
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Brand Adaptability: Compatible with mainstream brands including Haitian, Fanuc, Sumitomo and Arburg, adjustable according to specific models.
2. Ball Screw Specification Selection Chart by Injection Molding Machine Tonnage
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Machine Tonnage
|
Application Scenarios
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Precision Grade
|
Screw Diameter (mm)
|
Lead (mm)
|
Dynamic Load Rating (kN)
|
Compatible Models
|
|
≤50 Ton (Micro)
|
Micro precision molding (micro electronics, tiny medical parts)
|
C3 / C5
|
14-18
|
5-10
|
15-30
|
Fanuc α-S15iB, Haitian Zhafir Venus 50
|
|
50-100 Ton (Small)
|
Standard precision molding (small electronics, toys, daily plastic goods)
|
C5
|
18-22
|
10-16
|
30-50
|
Fanuc α-S100iB, Sumitomo SE-DUZ 750
|
|
100-200 Ton (Small-Medium)
|
General molding (home appliance shells, small auto parts, packaging products)
|
C5
|
22-32
|
16-20
|
50-80
|
Haitian Mars II 120, Engel e-motion 440H
|
|
200-500 Ton (Medium)
|
Medium-large molding (automotive connectors, home appliance accessories, industrial components)
|
C5 / C3
|
32-60
|
20-25
|
80-150
|
Arburg ALLROUNDER 570, Haitian Jupiter 300
|
|
500-1000 Ton (Large)
|
Large part molding (automotive bumpers, instrument panels, large industrial parts)
|
C3
|
60-120
|
25-32
|
150-300
|
KraussMaffei precisionMolding 3200, YIZUMI 8500T
|
|
≥1000 Ton (Extra-Large)
|
Ultra-large molding (large containers, engineering parts, automotive chassis components)
|
C3
|
120-220
|
32-40
|
300-600
|
Arburg ALLROUNDER 920A, YIZUMI 9000T
|
3. Key Selection Notes to Avoid Errors
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Lead Selection: Larger lead enables faster operating speed for high-yield production; smaller lead delivers higher positioning accuracy for precision molding scenarios.
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Load Margin: Reserve 10-20% extra load capacity during selection to prevent accelerated wear from long-term full-load operation and extend service life.
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Brand Adaptation: Different injection molding machine brands have slight differences in mounting dimensions. Confirm installation type and size to avoid assembly mismatch.
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Special Working Conditions: Adopt stainless steel materials and enhanced sealing structures for high-temperature, high-dust and corrosive working environments to improve adaptability.
4. Selection Summary
The core of tonnage-based ball screw selection is matching load capacity, precision level and operating speed. This universal selection chart covers mainstream machine tonnages and application scenarios for direct reference. For special requirements such as ultra-high precision, high-speed operation and harsh working conditions, optimize specifications based on manufacturer technical parameters to achieve perfect matching between ball screws and injection molding machines, ensuring stable and high-efficiency production.
