Precision Forging Dies

Precision Forging Dies

As a top maker of precision forging dies, NICHIDAI uses advanced technologies it has developed since its foundation to provide precision forging dies as an optimum solution to meet its customers’ requirements and applications. The company enables the conversion of parts production into net-shape manufacturing through the proposal of optimum engineering methods, including cold forging that gives it a significant edge over its competitors in the industry, warm/hot forging, as well as flow control forging and powder molding in which it is not specialized.

Die for press image

Die for press

Die for former image

Die for former

Ideal processing method “Net-Shape production”

Cold forging where forming is performed at room temperature with a high pressure causes high loads onto the die and increases the degree of difficulty in processing. However it provides high precision and strength, contributing to the reduction of resource and energy, and significantly improving productivity. As parts manufacturing will possibly be advanced, sophisticated, and diversified in future, NICHIDAI is working toward the conversion of the process of all formed products to net-shape manufacturing.  ※1

※1:Forming into final geometry without cutting work

Comparison with cutting work

  Cutting work Cold forging
(Net-Shape)
Advantages
Productivity Fast processing speed and high productivity
Stock utilization High stock utilization
Product strength Tight connection of metal fibers and work hardening improve product strength
Processing precision Realization of Net-Shape manufacturing with high precision

Classification by forging temperature

  Cold forging Warm forging Hot forging
Characteristics Performed at room temperature (or conditions close to room temperature) Performed at temperatures below recrystallization temperature of the material by heating it Performed at temperatures above recrystallization temperature of the material by heating it
Forging temperature ※1 Normal temperature
(Room temperature)
600℃~850℃ 1100~1250℃
Forging load High Middle Low
Dimensional accuracy
Surface conditions

※1:steel

Cases for formed products

NICHIDAI’s net-shape technology contributes to the development of a wide variety of precision forgings.

Cross joint

photo:Cross joint

<Forming conditions>

Material : SCr420H

Forming speed : 17~20SPM

Temperature : Room temperature

Press used : Mechanical press

<Descriptions>

  • Cutting allowance reduced by enclosed forging
  • Forging by bilateral hydraulic enclosing mechanism with pantograph system

Inner race

photo:Inner race

<Forming conditions>

Material : SCr420H

Forming speed : 17SPM

Temperature : Room temperature

Press used : Mechanical press

<Descriptions>

  • Cutting allowance reduced by enclosed forging
  • Forging by unilateral hydraulic enclosing mechanism

Hypoid pinion gear

写真:ハイポイドピニオンギヤ

<Forming conditions>

Material : SCr420H

Forming speed : 20mm/sec

Temperature : 800℃

Press used : Hydraulic double-acting press

<Descriptions>

  • Cost reduced by forging machined parts
  • Strength improved by forging the tooth-shaped portion

Bevel gear

写真:ベベルギヤ

<Forming conditions>

Material : SCM420H

Forming speed : 17~20SPM

Temperature : Room temperature

Press used : Mechanical press

<Descriptions>

  • Cutting allowance reduced by enclosed forging
  • Forging by unilateral hydraulic enclosing mechanism

Helical gear

精密鍛造金型イメージ

<Forming conditions>

Material : SCr420H

Forming speed : 20mm/sec

Temperature : Room temperature

Press used : Hydraulic double-acting press

<Descriptions>

  • Cost reduced by the use of solid-core materials
  • Forming load reduced by two-stage motion

Scroll

精密鍛造金型イメージ

<Forming conditions>

Material : Aluminum alloy

Forming speed : 17SPM

Temperature : 420℃

Press used : Mechanical press

<Descriptions>

  • Tap height levelled by back pressure forming
  • Cutting allowance reduced by back pressure mechanism

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