Definition and function of cast iron square box

Cast iron square box is a cubic positioning device made of cast iron material (usually 100mm × 100mm × 100mm and above specifications), connected to a three-dimensional welding platform through T-shaped grooves, threaded holes or dovetail grooves, mainly used for multi-faceted positioning and benchmark support of workpieces. Its core advantages include:

Six sided benchmark: All six working faces have undergone precision machining, with a flatness of ≤ 0.02mm/m and a right angle accuracy of ± 0.03mm/m;

• High load-bearing capacity: Single point static load can reach 5-8 tons (depending on size);

Environmental resistance: Cast iron material is corrosion-resistant and high-temperature resistant (≤ 300 ℃), suitable for harsh working conditions in welding workshops.

Classification and Characteristics of Cast Iron Square Boxes

1. Standard cast iron square box

• Structure: All six sides are smooth, and some models have weight reduction slots;

• Applicable scenarios:

Three dimensional positioning of small workpieces (such as flanges and gears);

As a calibration tool for the detection reference block.

2. Cast iron square box with T-shaped groove

Design: There are T-shaped slots (such as 14mm × 14mm) on the top and side surfaces, which can be used to install fixtures or pressure plates;

• Features:

Compatible with the T-shaped groove of the 3D platform, achieving fast combination positioning;

Suitable for complex welded components that require multi angle fixation (such as pipe elbow welding).

3. Cast iron square box with threaded holes

Structure: Six surfaces are evenly distributed with M8-M16 threaded holes (spacing 50mm/100mm);

Locking method: directly fix the workpiece or adapter plate with bolts;

• Typical applications:

Anti deformation clamping of thin-walled components (such as aluminum alloy shells);

Positioning of fixtures that require frequent disassembly.

4. Adjustable cast iron square box

Function: Adjust the height through hydraulic or mechanical mechanisms (such as 100-200mm);

• Advantages:

Adapt to workpieces of different heights;

The built-in level ensures stability after adjustment.

Installation and adaptation of cast iron square box

Installation method

1. Connect with the platform:

Fix with T-slot bolts (recommended torque: M12 bolt 35-45N · m);

Multiple square boxes can be combined to form a stepped or bridge shaped support structure.

2. Connection with workpiece:

◦ Clamping with pressure plate and bolt (anti indentation pad required);

The magnetic square box can adsorb small ferromagnetic workpieces.

Adaptation suggestions

• Platform compatibility: Choose a square box that matches the size of the T-shaped slot on the platform (such as selecting 18mm T-shaped bolts for a slot width of 18mm);

• Workpiece adaptation:

Large workpieces require square box supports to enhance stability;

◦ Precision positioning recommends square boxes with scale lines (accuracy ± 0.01mm);

Anti deformation design: To avoid concentrated loads on one side, it is recommended to distribute weight symmetrically.

Selection and maintenance suggestions

Key parameters for selection

Material: HT200 (normal load) or HT250 (heavy load);

Accuracy level: GB/T 4986-2007 standard, divided into level 0 (± 0.01mm) and level 1 (± 0.02mm);

Surface treatment: Blackening treatment or hard chrome plating (to improve wear resistance);

Attachment options: Customizable V-slots, eyelets, or scale rulers.

Maintenance points

1. Cleaning and maintenance:

Use a copper brush to clean the welding slag in the T-shaped groove to avoid scratches;

Regularly use granite slabs to test the flatness of the working face;

2. Anti corrosion: Apply anti rust grease and cover with moisture-proof paper when idle for a long time;

3. Accuracy recovery: When it exceeds the tolerance, it can be repaired by grinding (it is recommended to return it to the factory for processing).

Extended product recommendations

Cast iron magnetic square box: The bottom is embedded with rare earth magnets, which quickly adsorb onto the platform (suction force ≥ 50N/cm ²);

Cast iron square box set: including square box, pressure plate, bolt, and portable toolbox;

Cast iron square box bracket: equipped with ball screw lifting mechanism, supporting height adjustment.

Additional explanation:

Comparison between cast iron square box and granite square box:

Cast iron: high rigidity, low cost, suitable for on-site use in workshops;

Granite: High precision, anti magnetization, suitable for precise testing in metrology rooms.

For high-temperature welding scenarios, it is recommended to choose cast iron square boxes with high-temperature resistant coatings (such as ceramic coatings).