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R&D

Innovative R&D is behind
the differentiated technology and highly reliable products.

Research Task

Research on the development
of pre-heat-treated housing bolts
for automotive air-conditioning compressors

연구과제

Purpose

Cost reduction and quality consistency in the manufacture of high-strength bolts
using 9.8T and 10.9T pre-heat-treated steel

Value Engineering (VE)

  • Removal of the heat treatment process for greater cost-competitiveness
  • Cutting-edge technologies and novel manufacturing techniques for bolts for greater competitiveness of suppliers

Product Consistency

Removal of the heat treatment-induced defects, including scales and bends,
for customers’ zero defects (leaks)

Task and
Executed Activities

Process design to minimize the stress occurring in forging following the removal of the heat treatment process
from the manufacture of high-strength bolts, and resolution of the problem of reduced mold lifespans
from the use of pre-heat-treated steel

VE(Value Engineering)

VE(Value Engineering)

Delayed Fracture Testing

Test item Bolting torque (N.m) Sample amount (ea) Duration time (hrs) Test result
ESW95 260 26 96 Pass
ESW100 260 26 96 Pass
ESW105 260 26 96 1ea NG
ESW110 260 26 96 9ea NG
ESW115 260 26 96 13ea NG

Axial Force Testing

축력시험

Internal Load Testing
of Assemblies

Internal Load Testing of Assemblies
SCM435 #1 SCM435 #2 ESW91 #1 ESW91 #2
Rear head side SCM435 #1 SCM435 #2 ESW91 #1 ESW91 #2
Load(N) 121530 122567 114534 122611

Durability Testing
of Assemblies

Durability Testing of Assemblies험
Before durability After durability Differetial (%) 800rpm Capa.(kcal/h) 3633 3607 0.70% HP(HP) 2 1.94 3.10% COP 2.84 2.91 -2.30% Td(℃) 86 88 -1.70%

Achievements

Product Cost

Reduction Rate

7.3%

Customers’ zero defects (leaks),
as verified in the production of
2 million units

ZERO