Round Root

Not only use reinforced specialized material for Tie-bar; after evaluating with computer calculation, Tie-bar roots could be designed into round shape processing with CNC lathe. And this can decrease the stress concentration to up 44%, overcoming the serious broken T-shaped root problem caused by non homogenized heat treatment and overconcentrated stress on the root.

Lathe :

Primary Equipment::
Aperture ø400x6000 CNC Computerized Lathe
ø230x4000 CNC Computerized Lathe
ø150x3000 CNC Computerized Lathe

1. V26-#3 / V36-#5 / V45-#7 / V46-#7 / CNC computerized lathe
2. 1000mm、3000mm、4000mm、6000mm、12000mm high speed lathe


Primary Equipment: 2000mm, 3000mm, 4000mm, 6000mm, 12000mm CNC computerized barrel grinder, precision grinding QC, specialized for precision customization quality.


Primary Equipment: 1300mm, 1400mm, 1500mm, 2000mm vertical computerized miller 600, 750 horizontal CNC computerized miller.

Analytic Equipment

Analytic Equipment: gauge, vernier caliper, micrometer for interior and exterior diameter, disc type micrometer, 3 wire gauge, cylinder bore gauge, depth gauge, hardness tester, coating thickness tester, surface topology interferometer, coordinate measuring machine…, etc.

Product Information

Steel material for Tie-bar, mandrel processing: JFE880NH、SCM440QT、S45CQT、SNCM439、SCM415.
  • Material
  • Primary Equipment:

    Comparing ingredients between (Golden Cross Steel) JFE880NH and (Red Cross Steel) SCM440
    Steel C Sl Mn P S Cr Mo V
    JFE880NH 0.46 ~ 0.50 0.15 ~ 0.35 1.40 ~ 1.70 ≤ 0.02 ≤ 0.05 0.10 ~ 0.30 -- 0.15 ~ 0.35
    SCM440 0.38 ~ 0.43 0.15 ~ 0.35 0.60 ~ 0.85 ≤ 0.03 ≤ 0.03 0.90 ~ 1.20 0.15 ~ 0.30 --

    Characteristics of (Golden Cross Steel) JFE880NH
    Steel material imported from JFE steel corporation, the non-quenched and tempered steel-JFE880NH (Golden Cross Steel). Patented steel composed of manganese, vanadium and other chemical ingredients.
    JFE880NH was produced under low-temperature and high pressure and can be manipulated without heat treatment. Convenient for shortening production process and time of deliverance. The hardess was evenly spread in the exterior and the interior part of the steel, making it highly in tensile strength and low in extension, all expands life duration of Tie-bar and machines.

    Compared the experimental data between non-heat treated JFE880NH and heat treated SCM440
    Texture External Diameter Load Capacity Tensile Strength Extension Rate HRC
    JFE880NH ø 14 mm 14500 94.2 14.6% 27.80
    SCM440QT ø 14 mm 13200 85.7 21.2% 26.60
    According to experiment result, compared with non-heat treatment (QT) JFE880NH and SCM440, which is heat treated (QT), the characteristics will be:
    According to the results, JFE880NH is the ideal steel for manufacturing Tie-bar than SCM440.。

    Aperture ø360x6000 CNC Computerized Lathe
    ø230x3000 CNC Computerized Lathe
    ø150x2000 CNC Computerized Lathe
    1. V26-#3 / V36-#5 / V45-#7 / V46-#7 / CNC computerized lathe
    2. 1000mm、3000mm、4000mm、6000mm、12000mm high speed lathe
Contact Us

No.258-54, Anding, Ancha Vil., Anding Dist., Tainan City 745, Taiwan
Tel: +886-6-5924302
Fax: +886-6-5924334