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crankshaft machine

-- Steady & Reliable Manufacturer --

Intro

Our crankshaft machines cover the full machining chain for engine crankshafts — CNC crankshaft grinders for main journals and pins, plus crankshaft millers for pre-machining before hardening and grinding. They are supplied to crankshaft OEMs, forging/casting plants that machine in-house, and engine builders running their own crankshaft lines.

Core Capability

A single setup can index between main journals and offset pins using multi-axis CNC interpolation and C-axis orientation, cutting the number of clampings needed to finish a crankshaft. This shortens cycle time and improves journal-to-pin positional accuracy compared with machining each feature on a separate general-purpose machine.

Premium Materials and Components

Materials and components are the most critical elements to affect the performance of the equipment.

We use high-quality raw materials and branded components to ensure that our high-performance machines have a long service life and short downtime.

  • External grinding wheel chuck
  • Flat grinding wheel chuck
  • Φ 400 or Φ 600 balance frame
  • M7130-5006 front bearing
  • Rapid advance and retreat cylinder
  • Pressure valve plate assembly
  • Feed box assembly
  • Overflow valve
  • Table control box
  • Grinding head box
  • Control panel assembly
Design for High Performance

The performance of a machine is the result of the combined effect of all its components.

Our technical team consists of experienced engineers and technicians who are not only proficient in the operation and maintenance of grinders, but also have a deep understanding of material properties and processing technology. This enables us to provide customers with customized solutions to meet their specific processing needs.

By deeply studying the design and manufacturing process of precision grinding machines and paying great attention to configuration and construction from the beginning, our R&D team is able to provide high-performance equipment.

Specification

Item Value
Model MQ8260 / MQ8312 Series
Max. crankshaft length 300–3200mm
Max. swing diameter Ø550mm
Max. main journal diameter Ø150mm
Max. crankpin diameter Ø120mm
CNC controlled axes 4–6 axes
Max. workpiece weight 1200kg
Positioning accuracy ±0.005mm
Spindle motor power 15–22kW
CNC system Siemens 828D / Fanuc 0i-F
Table/carriage travel 3300mm (matched to bed length)
Machine weight 12–18 tons (by bed length)
Overall dimensions (L x W x H) 6200–7800 x 2400 x 2000mm

Grinder and miller variants share the same bed/travel logic but differ in spindle head and tooling — tell us whether you need grinding, milling, or both in the line and we will match the model.

Workpiece Range

Built for diesel and gasoline engine crankshafts, heavy-truck and marine engine crankshafts, and compressor crankshafts from 300mm up to 3200mm in length. Materials include forged steel, ductile iron and micro-alloy steel, machined either as pre-hardened blanks (miller) or hardened/finish-ground shafts (grinder).

Process Integration

Roughing and finishing of main journals, crankpins, flange faces and fillets can be sequenced on the same platform, with in-process measurement between passes. This is aimed at manufacturers who want fewer machine-to-machine transfers and tighter journal-to-pin positional control across a full production batch.

Core Functions

  • Multi-axis CNC interpolation for combined main-journal and crankpin machining
  • C-axis indexing/orientation for accurate pin-to-pin and pin-to-journal phase angle
  • Automatic tool or wheel change between roughing and finishing operations
  • In-process measurement feedback to hold diameter and positional tolerance across the batch
  • Pre-balance check station to flag mass distribution issues before final grinding
  • Centralized chip and coolant management for continuous multi-shift operation

Quality Control

  • Dimensional inspection against the customer's drawing at every build stage
  • CMM audit of journal/pin diameter, roundness and positional tolerance before shipment
  • Factory acceptance test (FAT) with the customer's own sample crankshaft where required
  • Batch traceability records for major components (spindle, guideways, servo drives)
  • ISO9001-certified process with a documented warranty and spare-parts support plan

FAQ

  • Q: What is the difference between a crankshaft grinder and a crankshaft miller?
  • A: The miller pre-machines journals and pins on a forged or cast blank before heat treatment, while the grinder finishes the hardened crankshaft to final size and surface finish; many customers run both stages on our matched platforms.
  • Q: Can main journals and crankpins be machined on the same machine?
  • A: Yes, our multi-axis crankshaft machines index between fixed-center journal machining and orbital pin machining in one setup, reducing the number of clampings needed.
  • Q: What crankshaft lengths can be handled?
  • A: Standard beds cover 300–3200mm; longer marine crankshafts can be accommodated with an extended bed and additional steady rests.
  • Q: How long does delivery normally take?
  • A: Standard models typically ship in 60–75 days; lines with automation or non-standard bed length may require 90–120 days.
  • Q: Do you support installation at our factory?
  • A: Yes, our engineers handle on-site installation, commissioning with your sample crankshaft, and operator/maintenance training.

Structural Configuration

  • Heavy box-way bed for milling variants; hardened linear guideways for grinding variants
  • Hydraulic tailstock and multiple steady rests to control deflection on long crankshafts
  • Servo-driven axes with a choice of Fanuc, Siemens or domestic servo packages
  • PLC-integrated safety interlocks and centralized lubrication system
  • Optional automatic gauging station mounted in-line for 100% dimensional feedback

Where It Is Used

  • Engine OEM and Tier-1 crankshaft production plants
  • Forging and casting suppliers machining crankshafts in-house
  • Heavy-duty truck and diesel engine manufacturers
  • Marine engine builders requiring long-bed crankshaft machining
  • Crankshaft remanufacturing and overhaul facilities

Automation Options

  • Integration with upstream forging or casting lines for direct blank transfer
  • Automatic gauging and sorting station at the machine outfeed
  • Robot loading for high-volume, multi-shift crankshaft lines
  • Custom multi-crankshaft fixtures for mixed-model production
  • CNC program development tailored to a customer's own crankshaft drawing
  • 35000 m²+
    Total Factory Area
  • 2003
    Was Founded In
  • 210+
    Precision Equipment
  • 45+
    Exporting Countries & Regions
Zhejiang Quanshun Machine Tool Co., Ltd.

Zhejiang Quanshun Machine Tool Co., Ltd.

Zhejiang Quanshun Machine Tool Co., Ltd. is a professional manufacturer of precision grinding machines. It is located in Zhuji, Zhejiang Province, the main economic development area of the Yangtze River Delta. It is 65km away from Hangzhou, 180km away from Shanghai, 60km away from Hangzhou International Airport, and 60km away from expressways such as Hangjinqu, Zhuyong, and Shaozhu, with convenient transportation and unique geographical location.

The company covers an area of 35000 square meters and a building area of 32000 square meters. Zhejiang Quanshun Machine Tool Co., Ltd. is a professional wholesale crankshaft machine Manufacturers and crankshaft machine Factory. It has a machine tool production base and a hydraulic parts production base. The main products are various specifications of ordinary (CNC) cylindrical grinding machines, CNC end face cylindrical grinding machines, automatic loading and unloading CNC (end face) cylindrical grinding machines, composite grinding machines，high-precision ordinary (CNC) cylindrical grinding machines, and we can design and develop various kinds of non-standard special grinding machines according to the needs of users and provide relevant technology, software, training services and automation solutions. Our company has complete product research and development capabilities, passed IS09001-2015 quality system and CE safety certifications, and was named "National High-tech Enterprise".In 2021, it was rated as a specialized and new small and medium-sized enterprise in Zhejiang Province. We also have self-export qualifications. Our company adheres to the concept of "quality first, reputation first, service first", so that our products have a good reputation in the market. At present, our products have been exported to more than 20 countries, such as the United States, Germany, Japan, and Southeast Asia.

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Certificate

Believe In Our Strength

Zhejiang Quanshun Machine Tool Co., Ltd. has more than 20 years of industry experience, we specialize in the manufacture of high-quality precision grinding machines.
  • Advanced manufacturing procedures.
  • Full quality management system.
  • Thoughtful after-sales service.

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