Chuo Spring : Enhancement of efforts for energy shifting to contribute SDGs

		May 11,2021
C o m p a n y N a m e:	C h u o S p r i n g C o . , L t d .
Name	of representative:	Satoshi Takae, Representative President
		(Securities code:5992;
		1st Section of the Tokyo Stock Exchange)
I n	q u i r i e s:	Fumiki Yazawa, Officer
		( T e l e p h o n e : + 8 1 - ( 0 ) 5 2 - 6 2 4 - 8 5 5 0 )

Enhancement of efforts for energy shifting to contribute SDGs

～ CO2 reduction through renovative manufacturing processes for coiled springs and stabilizers ～

Chuo Spring Co., Ltd. (Headquarters: Nagoya City Midori-Ku, President and CEO: Satoshi Takae) built a cold-processing facility at the Fujioka Plant (Toyota City, Aichi Prefecture) that will introduce heat treatment more efficient than conventional heat- processing, with the aim of contributing to a low-carbon society as part of its production process reforms. Conventional processing of springs for suspensions and stabilizers mainly involves heating in furnaces using gas and kerosene, but we are shifting to more efficient electrical heat treatment using high frequencies. In the

forming process of shapes, we are shifting from hot forming process

Photo : Toyota Motor Corporation to cold forming process without heating.

Through these improvements, we were able to reduce CО2 by approximately 80% per vehicle.

Coil Spring Manufacturing Process

【Material heating process】

【Forming process】

Hot

Process

Material
Furnace heating	Coiling
Kerosene heat treatment	Hot forming

Cold
Process
			V				V
	Material
	Induction	Water	Tempering	Coiling
	heating	quenching					Cold forming

electrical heat treatment

《Point of production process change: coiled spring》

• Heat treatment of materials changed from kerosene heatingto electric heating
  ・Changed from hot formingto cold formingto eliminate heating process

Stabilizer Process

【Head heating process】

【Material heating process ⇒ Forming process】

Material

Head heating	Eye forming	Furnace heating	Bending
Kerosene heat treatment		Kerosene heat treatment	Hot forming

Material	Eye forming
Head heating	Bending	Conduction heating
electrical heat treatment	Cold forming	electrical heat treatment

《Point of production process change: Stabilizers》

・Heat treatment of materials changed from kerosene

heatingto electric heating

・Changed from hot formingto cold formingto eliminate heating process

In addition, we established SDGs Promotion division, which aims to reduce emissions by 46% from the fiscal 2013 level by fiscal 2030, and will continue to deploy all measures on a Group-wide basis.

As an example, our 100% owned subsidiary Nagasaki Chuhatsu Co.(Omura City, Nagasaki Prefecture) installed solar panels to contribute to the popularization of clean energy.

Photo : Solar panels at Nagasaki Chuhtasu Co.

"Goal 13 for Specific Measures to Cope with Climate Change," which is one of SDGs's development goals in the future, we will work to realize a low-carbon society by expanding production process reforms for coiled springs and stabilizers not only to domestic plants but also to overseas affiliates.