Home / What is the Scope of Injection Molding Robot?

What is the Scope of Injection Molding Robot?

2022/04/28 By hqt

Injection Molding Robot 2022
Injection Molding Robot

What is plastic injection?

In general, it is an industrial process common to mold plastic and manufacture consumer parts. injection molding robot is a high performance and highly repeatable robot. It ensures the production of a large number of parts per unit of time.

For this reason, it is one of the most common methods in different industries such as the automobile, food, hospital and pharmaceutical utensils, household items and kitchenware.

Consequently, automation and specifically the use of robotics in plastic injection provides greater flexibility and reduction of failures. Still ensuring quality and increasing the profitability of each molded part.

Automation in the plastic injection sector

Plastic injection, as well as other molding technologies, are present in many industries. The use of injection molding robot is very common today. The vast majority of marketed products integrate parts of this material. A good example is the automotive industry, which continues to be the main applicant for injected parts, followed by containers and packaging.

These industries have been increasing their productive flexibility and profitability through robotics, automation and integration of peripherals around injection machines. Also, to achieve a better-quality analysis in 100% of the production and reduce errors.

Based on our experience in injection molding, both assembly lines at the foot of the injector and verification cells at cycle time. It not only helps in terms of productivity and profitability, injection molding robot also to project an image that allows customers to retain and win new projects. With these systems you guarantee production and quality.

High competitiveness and evolution make the integration of a robot in an injection machine almost mandatory. Whether it is a linear robot or a 6-axis robot.

Types of robot for injection molding


It is also called “gantry type”, they are the most common to assist injection molding machines. A very useful three-axis robot for unloading and repeatable injection cycle movements. They are durable and efficient robots for simple extraction maneuvers from a plastic injector.

A more flexible version is the 3-axis injection molding robot with articulated wrist. They allow the movement of the wrist activated by a servo at angles from 0º to 90º and from 0º to 180º. Fact that gives these robots a little more flexibility.

6 axes: robot similar to a human arm (anthropomorphic robot) that allows more complex movements for inserting and unloading parts, either due to the complexity of the part or the mold cavities.


The latest advance and novelty in industry 4.0. They are six-axis robots that stop when they come into contact with a human or another object. Injection molding robot capable of working at maximum speed, reducing it or stopping in the presence of a human.

Comparison 6 axes versus Cartesian robot

Complexity in their programming systems: Cartesian robots are more intuitive to configure than a 6-axis robot. The former is specially predesigned for plastic injection, therefore their control software design to be intuitive and visual. In addition, fewer axes have to be moved.

For a 6-axis plastic injection robot, we solve this dilemma by designing a control screen. In this way, maintenance or operator can incorporate new values ​​for certain parameters, without having to touch the console or programming the robot. We also provide training, after the start-up.

Molding robot: difference in scope

The main difference lies in this point. An anthropomorphic injection molding robot has more freedom of movement than a Cartesian one. It has 360º rotation and 5 more axes. While a Cartesian is limited to vertical and horizontal movements.

The precision, typical of these robots, can be compromised by these vibrations. In addition, they are much more useful at the foot of the injector so that they manage more peripheral processes. Greater flexibility, greater reach and movement; therefore, better integration with other processes.

Cartesians have an advantage in the event that the available space between machines is scarce. And if height is the determining factor, a 6-axis machine is preferable next to the plastic injection machine.

Injection molding robot: cost and investment

Injection Molding Robot 2022

The differences lie in the necessary investment, the space available in the plant and the operations that can be carried out with each one.

Broadly speaking, a Cartesian is more affordable compared to a 6-axis robot that is more flexible and reusable in different projects and processes. A Cartesian robot will be the cheapest option, they also work well when extracting parts. But they fall short when you want to add more processes at the foot of the injector and synchronize them.

Return of investment if you continue to automate processes

For this, in the end, you will have to integrate a six-axis injection molding robot that allows you to expand the range of possibilities. If your intention is to automate more and more processes, and initially you can only install a robot to extract, we recommend installing a 6-axis, since that investment will have a return when you continue to automate more processes and can be common by integrating other peripheral equipment around it.

Therefore, when calculating the return on investment, it would be necessary to take into account the savings in labor, productivity and reduction of failures due to the successive automated processes. Not only productivity by automating the process of extracting parts from the injection machine.

Operations performed by injection molding robot in plastic injection

Inspection: by means of peripheral equipment such as artificial vision, the robot can carry out the operation of moving the piece for its positioning or it can move the inspection equipment. As well as feeding and unloading the test bench automatically.

Unloading: this technology is consolidated in the sector for unloading injectors. Especially the use of Cartesian robots, although in recent years the demand for anthropomorphic robots has grown due to their versatility.

Placement of inserts in the mold: certain components must be introduced into the mold of the injector and thus be integrated into the part. In this operation, six-axis robots that have greater mobility and allow inserting more complex inserts from the side of the fuel transfer machine are very useful.

Injection molding robot: cutting and deburring

Casting cutting by the same robot that extracts the piece, using blades or pneumatic pliers. Likewise, a robot is capable of deburring the parts, although in this case we recommend investing in the improvement or repair of the molds to reduce these failures, since the burrs tend to vary in size or position and complicate or make the process more expensive. to remove them.

Handling: the most common operation. The movement of parts between stations or machines.

Packing: for all the subject of packaging and palletizing at the end of the line.

Injection molding with cobots

Currently, the collaborative injection molding robot market has high growth prospects in many industrial sectors, and even in non-industrial ones.

These robots have the freedom of movement of an industrial robot. With a risk assessment and the correct integration of security, a cobot will assist human operators in your factory without the need for fencing.

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