In industrial production, servo electric screw presses, with their high precision and flexibility, have become essential production equipment for many companies. However, with so many products on the market, how can you choose the right servo electric screw press for your needs? The following five key indicators will guide you.

 Nominal Pressure

Definition and Importance

Nominal pressure refers to the maximum force allowed on the slide of a press when the slide is a certain distance from bottom dead center. Measured in kilonewtons (kN), it is the primary indicator of a press's operating capacity and directly determines the scale and intensity of stamping, forging, and other processing tasks it can perform. If the nominal pressure is too low, the press may not meet process requirements, resulting in incomplete workpiece processing and poor product quality. If the nominal pressure is too high, the equipment cost will increase, energy will be wasted, and the oversized equipment may also cause inconvenience in factory layout and other aspects. 

 How to Determine the Appropriate Nominal Pressure

When determining the required nominal pressure, factors such as the material, size, shape, and processing technology of the workpiece being processed must be fully considered. For example, forging large workpieces made of high-strength alloy steel requires a higher nominal pressure, while stamping thin sheet metal requires a relatively lower nominal pressure. Typically, companies can use past production experience or reference examples from similar product processing to initially estimate the required nominal pressure range. Taking into account future business development trends, a certain pressure margin can be reserved to ensure the press can adapt to changes in production tasks over time.

 Slider Stroke

Definition and Function

Slider stroke refers to the distance traveled by the slide from top dead center to bottom dead center, measured in millimeters. It determines the range of workpiece heights that a press can process and the depth of machining that can be achieved in a single stroke. An appropriate slide stroke is crucial for ensuring smooth processing and consistent product quality. If the slide stroke is too short, some workpieces with a certain height or requiring a large machining depth may not be fully machined. Conversely, an excessively long slide stroke can reduce press efficiency and occupy excessive production space. 

Select Slide Stroke Based on Processing Requirements

Different processing techniques and workpieces have different requirements for slide stroke. For example, in the stretching process, sufficient slide stroke is required to ensure that the sheet metal can be evenly stretched into the desired shape. In the forging process, a large slide stroke is also required to provide sufficient impact depth for forming large forgings. Companies should accurately calculate the required slide stroke based on the workpiece types and processing techniques they primarily process. Generally speaking, while meeting current production needs, a certain degree of versatility can be appropriately considered to ensure that the press can still function if product types change in the future.

Slide Speed

Definition and Impact

Slide speed refers to the speed of the slide during its working stroke, typically measured in millimeters per second (mm/s). It directly affects the production efficiency and processing quality of the press. A higher slide speed can increase the number of processing cycles per unit time, thereby improving production efficiency. However, excessive slide speeds can cause uneven stress on the workpiece during processing, resulting in quality issues such as deformation and cracking. Slide speed is also closely related to the life of the mold. Excessive slide speeds increase mold wear and shorten its service life.

 Factors Considered for Optimizing Slide Speed

When selecting slide speed, factors such as the workpiece material properties, processing technology, and mold capacity should be comprehensively considered. For materials with good plasticity, such as aluminum alloy, the slide speed can be appropriately increased to improve production efficiency. For materials with high hardness and brittleness, such as high-carbon steel, the slide speed should be reduced to ensure processing quality. Furthermore, different processing technologies, such as stamping and extrusion, have varying requirements for slide speed. Companies should find the most optimal slide speed setting based on actual production conditions through experimentation and empirical analysis to achieve a balance between production efficiency and product quality.

 Control Accuracy

The Critical Significance of Control Accuracy

Control accuracy is one of the key advantages of servo electric screw presses over traditional presses. It primarily encompasses position control accuracy and force control accuracy, and is typically measured in millimeters (mm) and kilonewtons (kN). High-precision control ensures that the press operates accurately according to preset parameters during processing, resulting in products with high dimensional accuracy and consistent quality. For example, in the stamping process of precision parts, deviations in position control accuracy can lead to dimensional deviations, impacting product assembly performance. Inadequate pressure control accuracy can result in substandard performance indicators such as part strength and hardness.

 Methods for Ensuring Control Accuracy

To ensure control accuracy, attention must be paid to the performance of the press's control system and sensors. Advanced CNC systems and high-precision sensors can monitor and provide real-time feedback on the slide's position and pressure, enabling the control system to make timely adjustments. Furthermore, the equipment's mechanical design and manufacturing accuracy also significantly impact control accuracy. For example, high-precision transmission components such as guide rails and lead screws can reduce error accumulation during motion, thereby improving overall control accuracy. When purchasing, it's important to obtain detailed information from the supplier regarding the control system's technical specifications and mechanical manufacturing processes. You can also verify that the control accuracy meets your production requirements by reviewing the product's accuracy test report or conducting actual machine trials.

 Equipment Stability and Reliability

 The Importance of Stability and Reliability

Equipment stability and reliability are directly related to a company's production continuity and production costs. A press with poor stability and reliability may experience frequent failures, leading to production halts. This not only impacts delivery times but also increases repair costs and indirect losses from equipment downtime. Furthermore, frequent maintenance can impair the equipment's overall performance, further shortening its lifespan.

Key Points in Assessing Stability and Reliability

First, examine the equipment manufacturer's production capabilities and brand reputation. Manufacturers with long-standing production experience, a strong market reputation, and a comprehensive after-sales service system often offer greater assurance in product design, manufacturing processes, and quality control. Second, investigate the brand and quality of key components used in the equipment. For example, the quality of core components like motors, reducers, and bearings directly impacts the press's operational stability. Furthermore, review the equipment's operating records and user reviews to understand the equipment's actual failure rate and reliability performance. When purchasing, choose market-proven, reliable products to provide a solid foundation for stable production. To sum up, when purchasing a servo electric screw press, you should fully consider the five key indicators of nominal pressure, slide stroke, slide speed, control accuracy, and equipment stability and reliability. Combined with your own actual production needs, you should comprehensively evaluate and compare products of different brands and models to purchase a high-quality press with high cost performance and suitable for the development of the enterprise, laying a solid foundation for improving the company's production efficiency and ensuring product quality.