IJAT Vol.10 No.3 pp. 381-391
doi: 10.20965/ijat.2016.p0381


Effect of Press Slide Speed and Stroke on Cup Forming Using a Plain-Woven Carbon Fiber Thermoplastic Composite Sheet

Takeshi Yoneyama*,†, Daichi Tatsuno*, Kiichiro Kawamoto**, and Masayuki Okamoto**

*School of Mechanical Engineering, Kanazawa University
Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan

Corresponding author, E-mail:

**Advanced Processing Group, Komatsu Industries Corp., Ishikawa, Japan

September 30, 2015
April 15, 2016
May 2, 2016
CFRP; carbon-fiber-reinforced thermoplastic; composite material; press-forming; mechanical servo-press

Carbon-fiber-reinforced thermoplastic (CFRTP) is viewed as a prospective material for high-cycle production of CFRP parts. This paper deals with a process whereby a preheated thermoplastic plain-woven carbon fiber fabric sheet is formed into a circular cup by a mechanical servo-press. The effects of press parameters, specifically the bottom dead center and slide speed in the forming of CFRTP cup, on the press load, pressure, internal temperature, shape accuracy, and internal structure have been investigated. A plain-woven carbon-fiber-reinforced PA6 thermoplastic sheet was used. The sheet consisted of four layers of woven 3K carbon and had a thickness of 1 mm. The sheet was heated to 320°C under a halogen heater so that it would be around the recommended temperature for forming 260°C after transfer to the mold. The sheet was pressed into a circular cup shape by a cold mold while the periphery was cramped by a heated holder so as not to cool the sheet before it was pulled into the mold cave. Die clearance was designed considering the thickness increase due to the fiber concentration during the forming. By increasing the slide stroke to the bottom dead center, the applied press load was increased and the internal structure was improved, showing no voids. By increasing the slide speed, the final press load was reduced and shape accuracy was improved through a good pressure distribution on the mold. Measurement of the surface temperature of the sheet during the forming revealed that it remained in the melting region of the resin in the case of fast slide speed, but dropped below the melting temperature in the case of low slide speed. This difference apparently led to spring-in or spring-back after the forming. The experimental results indicate that appropriate balance among press speed, bottom dead center, and sheet temperature is important in the high-cycle forming of CFRTP.

Cite this article as:
T. Yoneyama, D. Tatsuno, K. Kawamoto, and M. Okamoto, “Effect of Press Slide Speed and Stroke on Cup Forming Using a Plain-Woven Carbon Fiber Thermoplastic Composite Sheet,” Int. J. Automation Technol., Vol.10, No.3, pp. 381-391, 2016.
Data files:
  1. [1] N. Zahlan and J. M. O'Neill, “Design and fabrication of composite components; the spring-forward phenomenon,” Composites, Vol.20, pp. 77-81, 1989.
  2. [2] M. Hou and K. Friedlich, “Stamp forming of continuous carbon fiber/polypropylene composites,” Composites Manufacturing, Vol.2, pp. 3-9, 1991.
  3. [3] M. Hou, K. Friedlich, and R. Scherer, “Optimization of stamp forming of thermoplastic composites bends,” Composite Structures, Vol.27, pp. 157-167, 1994.
  4. [4] K. Friedlich and M. How, “On stamp forming of curved and flexible geometry components from continuous glass fiber/polypropylene composites,” Composites: Part A, Vol.29A, pp. 217-226, 1997.
  5. [5] J. Krebs, K. Friedrich, and D. Bhattacharyya, “A direct comparison of matched-die versus diaphragm forming,” Composites Part A, Vol.29A, pp. 183-188, 1998.
  6. [6] M. Sadighi, E. Rabizadeph, and F. Kermansaravi, “Effects of laminate sequencing on thermoforming of thermoplastic matrix composites,” J. Mat. Proc. Tech. Vol.201, pp. 725-730, 2008.
  7. [7] J. Chen, J. A. Sherwood, P. Buso, S. Chow, and D. Lussier, “Stamping of continuous fiber thermoplastic composites,” Polymer Composites, Vol.21, pp. 539-547, 2000.
  8. [8] P. Harrison, R. Gomes, and N. Curado-Correia, “Press forming a 0/90 cross-ply advanced thermoplastic composite using the double-dome benchmark geometry,” Composites Part A, Vol.54, pp. 56-69, 2013.
  9. [9] F. N. Nezami, T. Gereke, and C. Cherif, “Manipulating fabric shear deformation by means of membrane tensioning – From picture frame test to generic geometries,” SETEEC 13 WUPPERTAL-8th Technical Conf. & Exhibition Novel Aspects in Composite Technologies: from Fibre to Lightweight Structures, pp. 83-89, 2013.
  10. [10] W. Lee, M. K. Um, and J. H. Byun, “Numerical study on thermo-stamping of woven fabric composites based on double-dome stretch forming,” Int. J. Mat. Forming, Supplement, Vol.3, pp. 1217-1227, 2010.
  11. [11] P. Wang, N. Hamila, and P. Boisse, “Thermoforming simulation of multilayer composites with continuous fibers and thermoplastic matrix,” Composites: Part B, Vol.52, pp. 127-136, 2013.
  12. [12] Q. Zhang, J. Cai, and Q. Gao, “Simulation and experimental study on the thermal deep drawing of carbon fiber woven composites,” J. Mat. Proc. Tech. Vol.214, pp. 802-810, 2014.
  13. [13] B. Vieille, W. Albouy, L. Chevalier, and L. Taleb, “About the influence of stamping on thermoplastic-based composites for aeronautical applications,” Composites Part B: Engineering, Vol.45, pp. 821-834, 2013.
  14. [14] T. Miyake, and M. Seki, “Strength estimation for formed parts of carbon fiber reinforced thermoplastic composite by accounting for forming process effects,” The 19th Int. Conf. on Composite Materials, 2013.
  15. [15] T. Yoneyama, T. Teraoka, K. Masuzawa, Y. Nishihara, S. Nagashima, and H. Yoshida, “Press forming of thermoplastic carbon fiber composite sheet,” J. Jap. Soc. Tech. Plas., Vol.53, No.613, pp. 145-149, 2012.
  16. [16] V. Antonelli, R. Carbone, S. Lindstedt, and R. Marissen, “Pressure distribution and surface quality during forming of thermoplastic composites with a collection of rubber particles as mould half,” 17th Int. Conf. on Composite Materials. 2013.
  17. [17] T. A. Altan and A. Groseclose, “Servo-drive presses-recent developments,” Umformtechnisches Kolloqium Darmstadt, Vol.10, 2009.
  18. [18] K. Osakada, K. Mori, T. Altan, and P. Groche, “Mechanical servo press technology for metal forming,” CIRP Annals-Manufacturing Technology, Vol.60, pp. 651-672, 2011.
  19. [19] H. Taoka, H. Nobuta, H. Meguri, and Y. Kageyama, “Optimization of Motion Control in High-Speed Servo Press Line,” Int. J. Automation Technology, Vol.4, No.5, pp. 439-445, 2010.
  20. [20] T. Yoneyama, M. Itoh, K. Masuzawa, D. Tatsuno, Y. Nishihara, T. Moriyasu, S. Nagashima, M. Okamoto, and T. Konda, “Press forming of semi-peripheral cup using thermoplastic carbon fiber woven composite sheet,” J. Jap. Soc.Tech. Plas., Vol.55, No.636, pp. 23-27, 2014.
  21. [21] T. Yoneyama and H. Kagawa, “Fabrication of cooling channels in the injection molding by laser metal sintering,” Int. J. Automation Technology, Vol.2, No.3, pp. 162-167, 2008.
  22. [22] T. Yoneyama, S. Abe, and M. Miyamaru, “Reducing weld line by heating mold surface with heater embedded by laser metal sintering,” Int. J. Automation Technology, Vol.6, No.5, pp. 591-596, 2012.

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Last updated on Aug. 21, 2019