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Grinding Machine for Hydraulic Cylinder

-- Steady & Reliable Manufacturer --

Intro

This grinding machine line is built for the parts that carry a hydraulic cylinder's sealing surfaces: piston rods, pistons, valve spools and short sleeves. The main job is long, slender rods ground before and after chrome plating with straightness and surface finish that seals can live with.

Core Capability

Multiple hydraulic steady rests support the rod along its length, and a CNC cylindrical grinder takes it to size and finish, then regrinds or finishes the chrome layer after plating. Cylinder tube bores are normally finished by honing or skiving and roller burnishing, so this line concentrates on the rod and internal moving parts.

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

ItemValue
ModelMK1340-H (long rod series)
Piston rod diameter rangeØ20–250mm
Max. rod length2000–6000mm
Steady rests3–8 hydraulic units (length dependent)
Roundness accuracy≤0.005mm
Straightness after grinding≤0.02mm per meter (blank dependent)
Surface finish before platingRa0.2–0.4µm
Surface finish after chrome finishingRa0.1–0.2µm
Grinding wheel sizeØ600–750 x 60–100mm
CNC systemFanuc 0i-F / Siemens 828D
Main motor power11–15kW
Machine weight8–14 tons (by bed length)

Straightness depends strongly on the incoming bar; heavy straightening before grinding gives better results than expecting the grinder to correct a bent blank.

Parts Covered

Piston rods from Ø20–250mm and up to 6 meters in carbon, alloy or induction-hardened steel, plus pistons, piston heads, gland bushings and valve spools on the same machine family with suitable fixturing. Short sleeve bores can be ground on our ID/OD machines.

Pre- and Post-Chrome Work

Rods are ground to a controlled pre-plating size and finish so the chrome layer is uniform, then the plated surface is ground or finished to final diameter and Ra. Leaving too little or too much plating allowance is the usual cause of scrap, so the program sets stock removal from measured diameter.

Core Functions

  • Hydraulic steady rests positioned automatically along the rod length
  • CNC grinding cycles for pre-plating and post-plating passes
  • In-process gauge to control diameter and chrome stock removal
  • Programmable traverse speed to avoid chatter marks on long slender rods
  • Fine dressing cycle for sealing-surface finish
  • Optional straightness measurement carriage for long rods

Quality Control

  • Test grind on a long rod sample to confirm straightness, roundness and finish
  • Steady rest pad contact checked to avoid marking the ground surface
  • Surface roughness measured at several points along the test rod
  • Bed straightness and alignment verified over the full length
  • ISO9001-certified manufacturing with documented warranty terms

FAQ

  • Q: Can this machine grind the bore of the hydraulic cylinder tube?
  • A: Long tube bores are normally finished by honing or skiving and roller burnishing rather than grinding; our machines handle the piston rod, piston, gland and spool parts, and short sleeves can be ground on the ID/OD grinding machine.
  • Q: How long a rod can it grind?
  • A: Standard beds cover 2 to 6 meters with 3–8 steady rests; longer rods can be quoted with an extended bed.
  • Q: How do you control chrome thickness after plating?
  • A: The in-process gauge measures the diameter during the post-plating pass and the program removes only the allowance needed to reach final size and finish.
  • Q: Will the steady rests mark the rod surface?
  • A: Soft-contact pads and controlled clamping force are used to protect the surface, and pad contact is checked before shipment; finishing passes are programmed with the rest positions in mind.
  • Q: What is the typical lead time?
  • A: Standard configurations usually ship in 70–90 days; longer beds or added measurement carriage may extend this to 100–130 days.

Equipment Configuration

  • Extended, reinforced bed sized to the longest rod
  • Hydraulic steady rests with soft-contact pads to protect the surface
  • Heavy-duty tailstock with controlled thrust for slender workpieces
  • Closed coolant filtration with fine filtering for finishing passes
  • Choice of Fanuc or Siemens CNC control

Where It Is Used

  • Hydraulic cylinder manufacturers producing piston rods in-house
  • Chrome plating and rod finishing service providers
  • Mobile equipment, excavator and agricultural machinery cylinder makers
  • Valve and pump manufacturers grinding spools and pistons

Automation Options

  • Custom bed length and steady rest count for your longest rod
  • Rod loading and unloading handling for long, heavy workpieces
  • Straightness measurement carriage integrated into the cycle
  • Program templates for rod size families with pre- and post-plating passes
  • Fixtures for pistons, glands and spools on the same machine
  • 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 Grinding Machine for Hydraulic Cylinder Manufacturers and Grinding Machine for Hydraulic Cylinder 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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