How to Select a Core Shooting Machine

Selecting the right core shooting machine requires more than matching a core weight to a machine model. Core geometry, core box dimensions, core-making process, shooting capacity, required output and automation level all influence the final equipment configuration.

For foundries evaluating a new core shooter, the most effective approach is to start with the core and core box, then determine the process and production requirements before selecting the machine.

This guide explains the main factors that should be considered when selecting a core shooting machine and the technical information an equipment supplier needs for a proper evaluation.

1. Start with the Core

The first step is to understand the core itself.

Important information includes:

• Core dimensions

• Core weight

• Core geometry

• Wall thickness and structural features

• Number and arrangement of core sections

• Required production quantity

A simple, compact core and a large, complex thin-walled core may require very different machine configurations even if their weights are similar.

For this reason, core weight alone should not be used to select a core shooting machine.

A core drawing is normally the best starting point for technical evaluation. If a drawing is not yet available, clear photos together with overall dimensions and approximate weight can also provide useful preliminary information.

2. Check the Core Box Dimensions

The core box is one of the most important factors in machine selection.

The supplier should normally know:

• Overall core box dimensions

• Core box structure

• Parting arrangement

• Number of cavities

• Required opening or core-pulling movements

• Approximate core box weight, where relevant

The machine must provide sufficient space for the core box and the required operating movements.

The shooting area must also be suitable for the actual core box and shooting arrangement.

Therefore, two core boxes producing cores of similar weight do not necessarily require the same machine.

When available, providing both the core drawing and core box drawing allows a more reliable equipment evaluation.

3. Confirm the Core-Making Process

Before selecting a machine series, the required core-making process must be confirmed.

Cold Box Process

In the cold box process, prepared sand is shot into the core box and cured by a gaseous catalyst system.

A cold box machine configuration may involve:

• Core shooting

• Gas generation and supply

• Curing and purging

• Exhaust gas collection

• Core box handling

• Sand preparation and distribution

For individual machine applications, WELTOP NEXA offers Cold Box Core Shooters. For projects requiring a higher degree of integration, the equipment can form part of a Cold Box Core Making System.

Hot Box Process

Hot box core making uses a heated core box to cure the core material.

Machine selection therefore needs to consider not only shooting requirements but also:

• Core box dimensions

• Heating method

• Temperature control

• Core-pulling requirements

• Production cycle

• Single- or double-station configuration

For these applications, Hot Box Core Shooters can be configured according to the required core and production process.

Resin-Coated Sand / Shell Core Process

For resin-coated sand applications, the machine and heated tooling work together to form and cure the required core or shell.

Selection should consider the core or shell geometry, core box size, shooting requirement, heating method and production cycle.

WELTOP NEXA Shell Core Machines are designed for this type of application.

The core-making process should therefore be confirmed before selecting a specific machine model.

4. Evaluate the Required Shooting Capacity

Shooting capacity is an important machine parameter, but it is frequently misunderstood.

A machine with a specified shooting volume does not mean that every core up to an equivalent sand weight can automatically be produced successfully.

Actual requirements depend on factors such as:

• Core volume

• Core geometry

• Sand process

• Core box design

• Shooting area

• Sand flow and filling characteristics

• Shooting arrangement

A complex core with narrow passages or difficult-to-fill sections can present different requirements from a simple core of similar weight.

For this reason, the required shooting capacity should be evaluated together with the core drawing and core box, rather than selected from core weight alone.

5. Determine the Required Production Output

A technically suitable machine must also meet the foundry's production requirements.

Useful information includes:

• Required cores per hour or per shift

• Working hours per day

• Number of working days

• Number of core types

• Frequency of core box changes

• Expected future production requirements

For example, a foundry producing several core types in smaller batches may place greater importance on flexibility and tooling changeover.

A high-volume production project may place greater emphasis on cycle organization, multiple stations, automated material handling and integration with upstream and downstream equipment.

Therefore, equipment selection should consider both current production requirements and reasonable future expansion.

6. Consider Single-Station, Multi-Station and Automation Requirements

Not every application requires a highly automated system.

A standalone core shooting machine may be appropriate where operators handle core boxes and finished cores manually or where production volumes are moderate.

For higher production requirements, the project may require additional functions such as:

• Multiple working stations

• Automated core box handling

• Sand conveying and dosing

• Sand mixing and distribution

• Gas supply and curing

• Robotic core handling

• Automatic core dipping

• Integrated exhaust handling

The appropriate automation level depends on the actual production process.

Adding automation without understanding the production requirement can increase system complexity without providing a corresponding production benefit. Conversely, insufficient automation can create unnecessary manual handling or restrict future capacity.

The correct approach is to define the production process first and then determine which functions should be automated.

7. Machine Selection Should Be Based on the Complete Application

A practical core shooting machine selection process can be summarized as:

Core → Core Box → Core-Making Process → Shooting Requirement → Production Output → Automation Level → Machine Configuration

This is more reliable than beginning with a machine model and trying to determine whether the application can be adapted to it.

For preliminary technical evaluation, foundries should ideally provide the following information:

Complete information is not always available during the early project stage. A preliminary evaluation can still begin with the core drawing or photo, approximate core dimensions and weight, core box dimensions and required process.

8. Common Mistakes When Selecting a Core Shooter

Several common mistakes can lead to an unsuitable machine configuration.

Selecting only by core weight.
Core geometry and core box design can be just as important as weight.

Selecting only by shooting volume.
Nominal shooting capacity is not a substitute for evaluating the actual core and tooling.

Ignoring the core box.
The machine must accommodate the tooling dimensions, movements and shooting arrangement.

Choosing the machine before confirming the process.
Cold box, hot box and resin-coated sand applications require different process configurations.

Focusing only on current output.
Where production is expected to increase, reasonable future requirements should be considered during the initial evaluation.

These issues can usually be avoided by carrying out application-based technical evaluation before finalizing the machine model.

Which Core Shooting Machine Is Suitable for Your Application?

There is no single core shooter configuration suitable for every foundry application.

WELTOP NEXA evaluates equipment according to the core geometry, core box dimensions, core weight, core-making process, shooting requirements, required output and automation level.

Depending on the application, the suitable solution may be a:

• Cold Box Core Shooter

• Hot Box Core Shooter

• Shell Core Machine

• Multipurpose Core Shooting Machine

• Integrated Core Making System

For an initial technical evaluation, send us your core drawing, core box information, core weight, core-making process and required production output.