REXRTOH CDH1/CGH1/CSH1 series milling machine type hydraulic cylinder

REXRTOH CDH1/CGH1/CSH1 series milling machine type hydraulic cylinder

Introduction

In the field of modern industrial automation, hydraulic cylinders serve as the core power source, and their performance directly determines the machining accuracy and dynamic response speed of machine tools, packaging, and printing equipment. Bosch Rexroth's CDH1, CGH1, and CSH1 series hydraulic cylinders are heavy-duty actuators designed specifically for heavy industrial applications. This series has a rated pressure of 250 bar and piston diameters ranging from 40 mm to 320 mm, designed to maintain structural integrity and motion stability under extreme loads. These hydraulic cylinders can provide reliable solutions for eccentric forces, high-frequency cycles, and lateral loads.

Design principles and structural characteristics

The core design concept of the CDH1, CGH1, and CSH1 series lies in their "head and bottom flanges" (principle A). This structural design ensures mechanical integrity under extreme working conditions such as high-pressure impact or high moment of inertia. This series offers multiple installation methods to accommodate different mechanical settings, mainly including the following six standard configurations:

Earring Installation (MP3): Designed specifically for dynamic applications, allowing for slight deviations between the cylinder block and frame, reducing stress and bearing wear.

Self centering Earrings (MP5): Most suitable for heavy radial loads, its self-aligning ball bearings can compensate for misalignment, thereby reducing wear and extending lifespan.

Head flange (MF3): Provides a compact axial thrust connection point.

Bottom flange (MF4): provides a safe installation surface for the cylinder block, optimizing force transmission.

Ear Shaft Installation (MT4): allows the cylinder body to rotate around a pivot, suitable for complex mechanical linkages.

Base Installation (MS2): A standard solution for long-distance applications, providing a stable support base.

Technical specifications and performance parameters

The performance parameters of this series of hydraulic cylinders vary with the change of cylinder diameter size. The following is an overview of key technical indicators:

Piston diameter (Ø AL): ranging from 40 mm to 320 mm. The larger the diameter, the greater the output thrust is usually (for example, a 40 mm piston force is about 31.4 kN, while a 320 mm piston force can reach 2010 kN).

Stroke: Optional length up to 6 meters.

Wire connection: Supports multiple standard interfaces, such as ISO 1179-1 (pipe thread), ISO 9974-1 (flange), and ISO 6164.

Sealing system and reliability

Industrial environments are often accompanied by oil mist, high humidity, and chemical corrosion. Bosch Rexroth offers a variety of sealing options to ensure long-term operational stability:

Standard Seal (M): Suitable for mineral oil HL, HLP, and HFA hydraulic systems.

Servo Quality (T): Low friction option, suitable for heavy industry.

HFC (Water Ethylene Glycol): Suitable for water containing ethylene glycol HFC media, with corrosion resistance protection (code "G").

HFDR/HFDU (phosphate ester/polyol ester): suitable for phosphate ester and polyol ester media (code "S").

V (herringbone seal): Suitable for specific dynamic load applications.

Terminal buffering technology

The impact caused by high-speed movement may cause damage to the equipment. Bosch Rexroth's CDH1, CGH1, and CSH1 series solve this problem through self-adjusting and adjustable end position buffering. This function can effectively absorb end impact energy, protect the hydraulic cylinder body and connecting equipment.

Self regulating buffer: automatically compensates damping for different loads to reduce vibration.

Adjustable buffer (E): allows for optimization of cycle time based on specific operating conditions.

Selection guide and ordering code

Proper selection is crucial to meet specific engineering requirements. The ordering code structure of this series is rigorous, divided into 16 fields. Engineers need to configure according to the following steps:

Series selection: Distinguish between CDH1 (differential cylinder), CGH1 (dual rod cylinder), or CSH1 (with position measurement).

Installation method: Choose from MP3, MF3, MF4, MT4, or MS2.

Size definition: Specify the piston diameter (e.g. 100 mm) and piston rod diameter (e.g. 56 mm).

Travel specification: Define the extension length in millimeters.

Port selection: Determine the interface position (1 to 4) and interface type (such as ISO pipe thread "M" or flange connection).

Piston rod and seal:

Material: Choose standard hard chrome plating, quenched hard or nickel plating (codes C, H, N).

Sealing design: According to the medium selection criteria (M, T, G, L, R, S or V).

Additional options: Proximity switches, position sensors, IO Link interfaces, or special coatings can be added.