Quality & Production

At every stage, we check quality thoroughly before passing work to the next process, and with measuring equipment such as precision coordinate measuring machines and roundness measuring machines, we provide final assurance of accuracy and quality.

Capabilities at a Glance

Mold size
Molds for injection molding machines in the 15–280 t clamping force class
Precision
Deformation predicted by flow analysis; molds corrected in 1 µm steps based on measurement data. Inspection and measurement data can be submitted
Materials
Plastics (super engineering plastics, engineering plastics, commodity resins) / magnesium alloy
Main applications
Optical parts, automotive parts, medical parts, micro-machined parts (decorative parts)
Main processes
Injection molding, two-shot molding, insert molding
Mold tryout
5 in-house molding machines (clamping force 15 t, 50 t, 75 t, 100 t, 180 t)
Secondary operations
Painting, printing, sub-assembly
Analysis
Analysis of cooling, filling, packing and warpage with flow analysis software
Metrology
Precision CMM, CNC vision measuring system, surface roughness tester, roundness tester, 3D scanner
Quality
ISO 9001:2015 (Head Office Factory, manufacturing of precision molds)
Overseas production capacity
95 injection molding machines in total (Dongguan 55, Wuxi 25, Philippines 15)

Quality Assurance

Our quality control system is built on three themes: process control, quality inspection and quality improvement. Through quality assurance at every process, we deliver products of reliable quality to our customers.

Where needed, we hold machining reviews to set the right processes at the outset, which helps maintain quality and reduce waste. Quality assurance shares the customer's perspective within the factory, and experienced staff are assigned to meet your requirements.

Measurement
We have a wide range of high-precision measuring instruments, including a precision CMM, CNC vision measuring system, surface roughness tester and roundness tester. We also use a 3D scanner to match parts against actual workpieces.
Ultra-precision measurement
We perform precision measurement with a variety of ultra-precision measuring systems, including UA3P and Zygo, and can submit inspection and measurement data.
Certification
ISO 9001:2015 (JIS Q 9001:2015) Quality Management System. Scope: Manufacturing of precision molds / Head Office Factory.

Equipment

  • 5-axis machining center V56i

  • Vertical 5-axis machining center Röders RXP501DS (with pallet changer)

  • 5-axis machining center ROBODRILL α-T21IFL

  • Vertical machining center V33i

  • Ultra-precision machine UVM-450C

  • Ultra-precision machine ULG-100D

  • CNC universal cylindrical grinder STUDER S33

  • Die-sinking EDM MA2000

  • Wire EDM UP6 H.E.A.T. RONDCOM NEX

  • One-shot 3D profile measuring system VR-5200

  • CNC coordinate measuring machine Crysta Apex

  • Roundness tester

Production Process

How a Mold Is Made

  1. STEP 1

    Design & Analysis

    Eliminating molding risks at the design stage through requirements definition and flow analysis

    1. 01Customer ConsultationWe discuss product specifications and the mass production process in detail with the customer and define the mold requirements.
    2. 02Flow AnalysisWe use flow analysis software to analyze filling, packing, cooling and warpage. Covering all types of resin, we verify molding concerns in advance and make proposals.
    3. 03DesignWe design the mold structure with CAD/CAM and send the machining data directly to the machine tools.

  2. STEP 2

    Precision Machining

    Building in micron-level accuracy through EDM, cutting, grinding and in-process measurement

    1. 04Material CuttingWe cut the stock for each component. This is the starting point of precision and the reference for every process that follows.
    2. 05Wire EDM, Sinker EDM & NC MachiningWe machine the shape required for each component by wire EDM, sinker EDM and NC machining.
    3. 06GrindingWe grind surfaces to micron-level accuracy.
    4. 07In-Process MeasurementWe measure dimensions repeatedly during machining and confirm accuracy at each stage.
    5. 08Finish PolishingWe apply fine finish polishing under a microscope.

  3. STEP 3

    Assembly & Tryout

    Proving mold performance through test shots on our own molding machines

    1. 09AssemblyWe assemble the machined components into a complete mold.
    2. 10Test ShotWe run test shots on molding machines in our own factory and verify the mold with molded parts.

  4. STEP 4

    Inspection & Shipment

    Dimensions guaranteed by high-precision measurement, and only molds that meet the standards shipped

    1. 11MeasurementWe use the latest measuring equipment to precisely inspect whether the specified dimensions are met.
    2. 12ShipmentWe ship only molds that meet every inspection item.

Semi-Automation That Combines Machines with Human Expertise

Automation with automatic machines is common practice. Rather than leaving everything to machine tools, we combine machines with human experience in semi-automation, aiming for manufacturing that no other company offers. Our engineering department takes on research topics as we build a production system unique to Nagatsu.

Locations

Two sites in Japan, two in China and one in the Philippines, organized to deliver not only quality but also speed and cost performance.

Map of Nagatsu locations (Japan, China and the Philippines)

Sites in Japan

Head Office Factory & Sales Office

Kawasaki, Kanagawa, Japan

Operations
Mold design & manufacturing / mold tryout & low-volume production / ultra-precision machining / measurement & quality assurance
Equipment
5 molding machines for mold tryout (15–180 t), nano-level machining room
Established
1980
Address
57 Nakamaruko, Nakahara-ku, Kawasaki, Kanagawa 211-0012, Japan
Phone
+81-44-433-8371

Niigata Factory

Mitsuke, Niigata, Japan

Operations
Mold design & manufacturing (CAD/CAM, machining)
Established
1991
Address
8-9-2 Imamachi, Mitsuke, Niigata 954-0111, Japan
Phone
+81-258-66-0610

Overseas Sites

Our two factories in China and one in the Philippines focus on volume molding, painting, printing and sub-assembly, and also handle mold making and parts machining. Local sourcing and processing help reduce costs for our customers.

Nagatsu Kam On Precision Molding (Dongguan) Co., Ltd.

Dongguan, Guangdong, China

Operations
Mold design & manufacturing, injection molding, painting, printing, sub-assembly
Equipment
55 injection molding machines (30–350 t), spindle painting line, and more
Employees
260 employees
Established
2000 (relocated to Dongguan in 2018)
Address
No. 31, North 2nd Street, Qiaodong Road, Wuxia Administrative District, Qiaotou Town, Dongguan, Guangdong, China
Phone
+86-796-8652-4001

Nagatsu Kam On Precision Optical Parts (Wuxi) Co., Ltd.

Wuxi, Jiangsu, China

Operations
Mold design & manufacturing, injection molding, printing, sub-assembly
Equipment
25 injection molding machines (50–180 t)
Employees
90 employees
Established
2006
Address
C7-1, Phase 5, Shuofang Industrial Concentration Zone, Airport Industrial Park, Wuxi New District, Wuxi, Jiangsu, China
Phone
+86-510-8534-2788

Nagatsu Seisakusho Philippines, Inc.

Santa Rosa, Laguna, Philippines

Operations
Plastic injection molding
Equipment
15 injection molding machines (50–180 t)
Employees
50 employees
Established
2017
Address
Unit4, Starts Rental Factory, Lot3-D, Autopark Avenue, Greenfield Automotive Park, Sta. Rosa City, Laguna, 4026 Philippines
Phone
+63-49-539-2746

Send us a drawing.
Request a quote or technical consultation

You can consult us even before you have a drawing. We can also sign an NDA first.

Request a Quote +81-44-433-8371Mon–Fri 8:00–16:45 JST