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How Should You Select a Cartesian Robot for a 550-1000Ton Injection Molding Machine?

2026/10/02 By le zhan

How Should You Select a Cartesian Robot for a 550–1000Ton Injection Molding Machine

Selecting the right Cartesian robot for a 550-1000Ton Injection Molding Machine requires more than considering clamping force alone. The robot must safely handle the molded part and EOAT, reach the required mold depth and placement position, complete part removal within the target cycle time, and communicate reliably with the injection molding machine and downstream equipment. Key selection factors include payload capacity, vertical and horizontal travel, product geometry, EOAT design, part retrieval time, three-axis or five-axis configuration, and automation interfaces.

How should payload and stroke be matched for a 550-1000ton injection molding machine?

For 550-1000ton injection molding machines, payload capacity is the primary consideration, as large molds typically produce heavier parts and require larger end-of-arm tooling.

However, Cartesian robots in injection molding handle more than just molded parts. Their payload may include parts, runners, fixtures, vacuum grippers, cylinders, sensors, inserts, and other EOAT. If selection is based solely on part weight, the robot’s actual operating load may come too close to its rated load limit once the complete end-of-arm tooling is installed.

From an engineering perspective, the robot must maintain sufficient load margin during acceleration, lifting, and high-speed lateral movement. For 550-1000ton injection molding machines, the robot must have enough downward travel to access the mold area, enough horizontal travel to clear the platen, and enough travel along the machine body to deliver the molded part to a conveyor belt, fixture, or downstream station.

The selection principle is simple:

Select stroke lengths based on the mold’s actual geometric dimensions and placement location, not solely on the injection molding machine’s tonnage.

How should payload and stroke be matched for a 550-1000ton injection molding machine

How do part geometry and EOAT selection influence the selection of a Cartesian robot?

When selecting a Cartesian robot for 550-1000ton injection molding machines, EOAT design is critical. If you only need a simple vacuum suction cup fixture to remove the product, the robot needs only a simple “pick-and-place” motion sequence. If the process involves insert loading, part rotation, sprue separation, trimming, inspection, or precise orientation adjustment before placement, the end-of-arm tooling becomes heavier, and the motion paths become more complex.

This directly affects the required axis configuration.

When the task primarily involves vertical mold entry, demolding, lateral movement, and simple placement, a three-axis Cartesian robot typically suffices. However, when the product or fixture requires posture adjustment, insert handling, or approaching downstream equipment at different angles, a five-axis robot is more suitable.

Therefore, for large injection molding machines, the complete handling process should be clearly defined before selection:

Insertion into the mold → Product pickup → Ejection → (If necessary) Orientation adjustment → Transfer → Placement or subsequent processing.

If the selected robot’s travel range and axis configuration cannot complete the above process, then even if its rated load capacity meets the requirements, the robot is considered a poor fit.

How do part geometry and EOAT selection influence the selection of a Cartesian robot

Evaluating Cycle Time and Motion Performance

For Cartesian robots used with large injection molding machines, the key performance indicator is the total removal time, not just the maximum axial speed. The robot must enter the mold, grasp the product, safely retract, and quickly exit the clamping area to avoid delaying the next molding cycle.

Topstar’s upgraded MBWE-130V model reduces the minimum removal time from 2.7 seconds to 1.8 seconds and shortens the reference empty cycle time from 11.3 seconds to 10.2 seconds. Faster demolding lets the injection molding machine begin closing the mold sooner, improving overall production efficiency.

However, speed must match the load and stroke. When long arms carry heavy-duty EOAT, the robot must control acceleration and deceleration carefully to suppress vibration and maintain stable placement. To this end, the MBWE-130V increases vertical-axis motor power from 750 W to 850 W and uses a fully motor-driven design, supporting heavier loads and enabling faster, more stable motion.

The goal of selection is not to pursue the highest speed, but to achieve the shortest stable retrieval time under actual load and stroke conditions.

Specifications Table

What Are the Most Important Automation Interfaces for 550-1000ton injection molding machines?

The final step in the selection process is to determine how the robot will communicate with 550-1000ton injection molding machines and other equipment in the automation cell. Cartesian injection molding robots must coordinate at least the following signals and statuses: mold opening permission, ejection conditions, robot entry, part confirmation, robot withdrawal signal, and mold closing permission. More complex automation cells may also require connections to conveyor belts, insert feeding systems, vision inspection, trimming devices, stacking equipment, safety devices, or the factory MES system.

For the 550-1,000 ton range, Topstar’s MBWE series Cartesian robots serves as an excellent reference example. This series features an MES interface, high-capacity I/O, and customizable programming to meet diverse automation needs.

Cartesian Robot Selection Guide for 550-1000ton injection molding machine

Taking the Topstar MBWE-130V configuration as an example, the following parameters are provided for reference:

Maximum payload: 15 kg (optional/configurable up to 20 kg)

Arm reach: 1,300 / 1,500 / 1,700 mm

Main Arm Forward/Backward Stroke: 1,000 mm

Minimum Pickup Time: 1.8 s

Reference Empty Cycle Time: 10.2 s

Transverse Motor Power: 750 W

Forward/Backward Motor Power: 750 W

Vertical Arm Motor Power: 850 W

Note: The above data should be used solely as a selection reference and does not constitute a universal specification standard applicable to all 550-1000ton injection molding automation units. Final decisions should follow these steps:

Confirm the weight of the product and EOAT → Verify the travel required to enter the mold and place the part → Determine the complete motion sequence → Select a 3-axis or 5-axis configuration → Verify the pickup time under load → Confirm the interface between the injection molding machine and peripheral equipment.

For 550-1000ton injection molding machines, a suitable Cartesian robot should safely handle the actual payload, reach all specified positions, complete the demolding operation within the target cycle time, and integrate seamlessly with the entire automation system.

 

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