What Is a Servo Press Fitting System and Where Is It Used?
Introduction
Press fitting is one of the most widely used joining processes in automotive and industrial assembly. Bearings, bushings, seals, pins, sleeves and similar components are pressed into housings or shafts, and the quality of that joint depends on how precisely force and displacement are controlled during the stroke. Traditional hydraulic and pneumatic presses can perform this work, but they offer limited insight into what actually happens inside the joint while the press is moving.
A servo press fitting system addresses this limitation by combining a servo-driven electric cylinder with integrated force and displacement measurement, real-time process monitoring and production data management. Instead of simply applying a force and hoping the result is correct, the system measures the pressing condition continuously and evaluates each cycle against defined criteria.
This guide explains what a servo press fitting system is, how it works, which features matter in production, and where the technology is applied in automotive manufacturing and industrial assembly. It is written for manufacturing engineers, production managers and purchasing teams who need to evaluate whether servo press technology fits their assembly requirements.
Product Overview
The N-Series Servo Press Fitting System is a high-precision CNC press unit designed for automated assembly and manufacturing applications. It integrates servo motion control, force and displacement measurement, process monitoring and production data management into a single modular system. For more information about the product, see the N-Series Servo Press Fitting System.
The system is available in multiple force configurations ranging from 2 kN to 350 kN, which allows the same control and software platform to be applied across a wide range of pressing tasks, from low-force precision assembly to high-force industrial pressing. Position accuracy is specified at up to 0.01 mm and force accuracy at up to 1% FS across the model range.
The core purpose of the system is to make press fitting processes stable, repeatable and traceable. Rather than treating press fitting as a fixed mechanical action, the system treats it as a measured process in which force, displacement and time are recorded and evaluated for every cycle.
Modular System Architecture
The system is built from several cooperating modules: a servo electric cylinder, industrial software, a control box, a monitoring instrument and a cable module. Each module contributes to motion control, process monitoring or data acquisition, and the modular design allows the press unit to be integrated flexibly into automated assembly equipment and automotive production lines. Depending on the equipment requirements, different press fitting functional modules can be selected for system integration.
Working Principle
A servo press fitting system replaces the fixed force profile of a conventional press with a programmable, measured motion profile driven by a servo electric cylinder. The cylinder moves the press rod, and a built-in pressure sensor measures the force applied during the stroke while the servo control system tracks position.
Because force and displacement are measured continuously throughout the assembly process, the system can monitor the pressing condition in real time. The resulting force-displacement and force-time curves describe how the joint behaved during the stroke, and these curves form the basis for process evaluation.
Control Modes
The system supports several control approaches, allowing the pressing strategy to match the component and the quality requirement:
Force-controlled pressing — the press follows a defined force profile.
Displacement-controlled pressing — the press follows a defined position profile.
External signal-based control — pressing is coordinated with signals from the surrounding automation.
Process Evaluation
Built-in evaluation functions support different pressing requirements. These include judgment windows, envelope curves and measurement analysis, together with OK/NG result evaluation. Multiple pressing steps and process curves can be configured within a single cycle, which is useful when a joint requires more than one stage of pressing.
Key Features
High-Precision Servo Control
The servo motion control provides force accuracy up to 1% FS and position accuracy up to 0.01 mm, supporting stable and precise movement during pressing. The servo electric cylinder uses a high-strength mechanical construction intended for demanding industrial production environments.
Integrated Force and Displacement Measurement
Force and displacement detection are integrated into the press unit. Measurement is continuous throughout the assembly process, so the system captures the full pressing condition rather than only the end point.
Real-Time Process Monitoring
Each pressing cycle can be monitored in real time to detect process deviations and maintain consistent assembly quality. The system samples at 20 kHz with 24-bit acquisition accuracy, which allows detailed process curves to be recorded for evaluation.
Process Data Traceability
Measurement data and assembly results can interact with PLCs and production servers, supporting process data recording and traceability. Results can be output in CSV or XLS formats, and the software supports MS SQL and Microsoft Access databases.
E-Press Industrial Software
E-Press industrial software provides an intuitive interface for programming, monitoring and evaluating press fitting processes. Its functions include:
Real-time force-displacement curve display
Real-time force-time curve display
Multiple pressing steps and process curves
Judgment window and envelope curve evaluation
Measurement and OK/NG result evaluation
Hierarchical user permission management
Press fitting history and operation logs
Alarm log management
Fieldbus Communication and Integration
The system supports OPC, EtherNet/IP and PROFINET fieldbus communication, allowing it to be connected to PLCs, industrial control systems and production servers. The anti-torsion press rod can be connected directly to press tooling, which simplifies integration into automated assembly equipment.
Mechanical and Environmental Specifications
| Parameter | Specification |
|---|---|
| Position accuracy | ≤ 0.01 mm |
| Force control accuracy | ≤ 1% FS |
| Maximum pressure holding time | 3 s |
| Noise | < 75 dB |
| Sampling frequency | 20 kHz |
| Acquisition accuracy | 24 bit |
| Service life | > 12 million cycles |
| Protection rating | IP54 |
| Operating temperature | 0–50°C |
| Operating humidity | 10–90% RH (non-condensing) |
| Supported languages | Chinese / English (CN / EN) |
Available Force Configurations
The N-Series is offered in eleven force configurations. Stroke length and running speed vary by model, while force accuracy and position accuracy remain consistent across the range.
| Model | Stroke (mm) | Maximum Pressure (kN) | Running Speed (mm/s) | Force Accuracy | Position Accuracy (mm) |
|---|---|---|---|---|---|
| 2 kN | 100–200 | 2 | 0.02–260 | 1% FS | 0.01 |
| 5 kN | 100–200 | 5 | 0.02–260 | 1% FS | 0.01 |
| 10 kN | 100–400 | 10 | 0.02–250 | 1% FS | 0.01 |
| 20 kN | 100–400 | 20 | 0.02–125 | 1% FS | 0.01 |
| 30 kN | 200–400 | 30 | 0.02–200 | 1% FS | 0.01 |
| 50 kN | 200–400 | 50 | 0.02–200 | 1% FS | 0.01 |
| 80 kN | 300–400 | 80 | 0.02–160 | 1% FS | 0.01 |
| 100 kN | 300–400 | 100 | 0.02–140 | 1% FS | 0.01 |
| 150 kN | 200–400 | 150 | 0.02–140 | 1% FS | 0.01 |
| 200 kN | 200–400 | 200 | 0.02–100 | 1% FS | 0.01 |
| 350 kN | 200–400 | 350 | 0.02–50 | 1% FS | 0.01 |
Specifications may vary depending on the product model, and the actual product configuration should be confirmed for a given application.
Applications
The system is intended for automated assembly and manufacturing environments. Typical application categories supported by the product include:
Press fitting and component assembly — joining components where force and displacement must be controlled and recorded.
Automotive component assembly — pressing operations within automotive component manufacturing and assembly lines.
Forming and riveting — forming operations and riveting tasks that benefit from controlled force and position.
Punching operations — punching tasks carried out within an automated assembly sequence.
Elasticity and performance testing — measurement-based testing where force and displacement data are evaluated.
High-cycle automated assembly — repetitive pressing work in continuous production environments.
Automotive Production Line Integration
The servo press fitting system is designed for automated manufacturing environments and can be integrated with PLCs, industrial control systems and production servers. This makes it suitable for automotive assembly lines that require high repeatability, quality control and process traceability. The system's rated power range of 0.2–14.5 kW and support for single-phase 220 V, three-phase 220 V or three-phase 380 V supply (depending on model) allow it to be matched to different line configurations. For complete automated pressing setups, KINMARK also provides press fitting workstations for different production requirements.
Benefits
Consistent Assembly Quality
Because each cycle is monitored and evaluated against defined criteria, deviations can be detected during production rather than discovered later. This supports consistent assembly quality across high-cycle production.
Improved Traceability
Measurement data and assembly results can be recorded and exchanged with production servers, supporting process documentation and traceability requirements in automotive manufacturing.
Flexible Process Design
Force-controlled, displacement-controlled and external signal-based control modes, together with multiple pressing steps and evaluation functions, allow the pressing strategy to be adapted to different component requirements without changing the basic press platform.
Simplified Line Integration
Fieldbus communication via OPC, EtherNet/IP and PROFINET, direct connection of the anti-torsion press rod to tooling, and a modular architecture reduce the effort required to integrate the press into automated assembly equipment.
Wide Force Coverage
With models from 2 kN to 350 kN, a single product family can cover low-force precision assembly as well as high-force industrial pressing, which simplifies specification and spare-parts planning across a plant.
Why Choose KINMARK
KINMARK (Jinan Zhongzheng Jinma Technology Co., Ltd.) was founded in 1996 and is a developer and manufacturer of marking and traceability systems, fluid filling systems, servo press systems and robot automation systems. The company is recognized as a Shandong Province “Gazelle” enterprise and a “Specialized, Refined, Distinctive and Innovative” enterprise, with offices and service centers in Shanghai, Beijing, Guangzhou, Changchun, Wuhan and Chongqing.
KINMARK's product portfolio spans marking and traceability, servo press fitting and fluid filling, and its business covers complete vehicles, powertrain, automotive components, construction machinery, home appliances, new energy, electronics and communication, and rail transit. The company has established long-term cooperation with automotive manufacturers and suppliers, and also provides automation solutions to well-known industrial enterprises.
For servo press fitting projects, KINMARK offers a 12-month warranty covering the complete machine, fast-response after-sales support with remote diagnosis and technical assistance, and installation and commissioning services including operator training to help customers start production smoothly.
Frequently Asked Questions
What is the difference between a servo press fitting system and a conventional press?
A conventional press typically applies a fixed force or stroke. A servo press fitting system uses servo motion control together with integrated force and displacement measurement, so the pressing condition is monitored continuously and each cycle can be evaluated against defined criteria such as judgment windows and envelope curves.
Which force range is available in the N-Series?
The N-Series is available in eleven configurations from 2 kN to 350 kN maximum pressure. Stroke length ranges from 100 mm to 400 mm depending on the model, and running speed varies by model from 0.02–260 mm/s at the low-force end to 0.02–50 mm/s at 350 kN.
How does the system support process traceability?
Measurement data and assembly results can interact with PLCs and production servers. The E-Press software maintains press fitting history, operation logs and alarm logs, supports MS SQL and Microsoft Access databases, and can output data in CSV or XLS formats.
Can the press be integrated into an existing automated assembly line?
Yes. The system uses a modular architecture and supports OPC, EtherNet/IP and PROFINET fieldbus communication, allowing connection to PLCs, industrial control systems and production servers. The anti-torsion press rod can be connected directly to press tooling to simplify mechanical integration.
What control modes are available for pressing?
The system supports force-controlled pressing, displacement-controlled pressing and external signal-based control. Multiple pressing steps and process curves can be configured within a cycle, and results are evaluated through measurement and OK/NG judgment functions.
Conclusion
A servo press fitting system turns press fitting from a fixed mechanical action into a measured, evaluated and recorded process. By combining servo motion control, integrated force and displacement measurement, real-time monitoring and data traceability, the N-Series Servo Press Fitting System provides a platform for precision assembly across a force range from 2 kN to 350 kN.
For automotive and industrial assembly applications where repeatability, quality control and traceability matter, the choice of pressing technology directly affects how reliably components are joined and how well those joints can be documented. Understanding the working principle, control modes, evaluation functions and integration options is the first step in specifying a servo press fitting system that matches the actual production requirement.
If you're interested in any of the equipment mentioned in this article, feel free to contact our sales engineers for detailed product information and customized technical solutions.