Chen Hsong’s MK6 series: emulating Japanese standards


Hong Kong-headquartered machinery maker Chen Hsong has introduced its latest MK6-series machines, boasting enhanced energy savings and featuring all-new streamlined hydraulics.

The machinery was displayed at an open house at the company’s Shunde, Guangzhou, China plant last year in November to commemorate the 30th anniversary of affiliate Foshan Chen De Plastics Machinery. Chen De manufactures SVP Series toggle clamping injection machines with clamping forces of 80 to 3,000 tonnes.

The company manufactures the MK6 injection machines at its flagship 560,000-sq m facility in Shenzhen, China, in clamping forces of 128, 168, 258 and 488 tonnes. Other machine models of clamping force 88, 208, 328, 408 and 600 tonnes are slated for release in 2017.

A 168-tonne clamping force JM168-MK6 unit on show at the Chen De open house was configured as part of a production cell for moulding light switch components but it would be equally at home processing remote control housings thick toothbrush handles.

Meanwhile, a JM168-MK6 machine was featured in a live demonstration of the moulding of two distinct light switch components in the same four-cavity injection tool. distinct-light-switch These parts were robotically demoulded, sprues automatically removed, and then placed on a conveyor. These components were then assembled along with two other components using two additional robots to realise the finished light switch. The robots were supplied by E-Deodar.

A 258-tonne MK6 unit was featured in a live demonstration of the moulding of polystyrene (PS) disposable spoons in a 32-cavity mould at a cycle time of 15 seconds. The injection machine was integrated with an automated packaging line. MK6-series machines are particularly targeted at processors requiring rapid cycle times. Dry cycle time is 1.7 seconds for the 258-tonne model, says the manufacturer.

MK6-series machines employ SVP/3 servo-hydraulic technology that typically delivers 40% energy saving on average compared with the previous generation of machines, says Chen Hsong, adding that it is continuing to optimise the machines with the objective of achieving further energy savings. It also says the hydraulic design was developed under the guidance of Japanese engineers and dubbed “Precision Hydraulics” realises repeatability within 0.05% in critical movement axes.

Chen Hsong says its ultimate goal was to realise an injection moulding machine that matches typical Japanese high standards in terms of performance, quality, stability, repeatability and reliability. And with the MK6, in the opinion of a former chief engineer at Japanese injection machine manufacturer Mitsubishi who currently works for Chen Hsong in the role of senior technical advisor, Chen Hsong has come “really, really close” in its effort.

Executive Director/Group Chief Strategy Officer at Chen Hsong Stephen Chung says more than 1,000 MK6 machines are already operating in the field and have only had a solitary field repair issue. “We hope to emulate Japanese injection machine suppliers whereby machine quality means after-sale service is to all intents and purposes no longer necessary,” adds Chung.

The new MK6 machines are also performing well in terms of part reject rates, according to Chen Hsong. Processors have reported reject rates falling from the 5% experienced on machines supplied by other Chinese vendors to 1% and in some cases further to 0.1%.

In attendance at the 30th anniversary were more than 400 Chen Hsong customers.


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