Editorial Technical Reference

Clamping Frame

This page explains how Clamping Frame is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A structural component that securely holds and positions the plastic sheet during the vacuum forming process.

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Product Specifications

Technical details and manufacturing context for Clamping Frame

Definition

The clamping frame is a critical component of an industrial vacuum forming machine that firmly grips the edges of the plastic sheet material, maintaining it in a taut, flat position throughout the heating and forming cycles. It ensures uniform material distribution and prevents wrinkles or distortions during the vacuum forming operation. Constructed from steel or aluminum alloy, the frame is designed to withstand the mechanical forces required to hold the sheet securely. Typical clamping forces range from 50 to 200 kN, depending on the sheet thickness and forming area. Frame sizes vary from 1000 to 3000 mm, with thicknesses between 20 and 60 mm to minimize deflection under load. The frame's flatness and parallelism tolerances are maintained within ±0.10 mm and ±0.15 mm, respectively, to ensure even pressure distribution. Surface treatments such as anodizing (10–25 μm) improve wear resistance and reduce friction. The operating temperature range is -20 to 80°C, above which warping may occur. The frame can accommodate sheets up to 10 mm thick, with heavier frames weighing 50–200 kg requiring reinforced mounting. Material grades like aluminum alloy 6061-T6 (ASTM B221) are specified for lightweight and corrosion resistance. All values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier.

Working Principle

The clamping frame uses mechanical pressure, typically via pneumatic or hydraulic clamps, to secure the plastic sheet around its perimeter. Once closed, it creates a sealed boundary that allows the vacuum system to effectively draw air from beneath the sheet, forcing it to conform to the mold shape when heated to its forming temperature. The frame's design ensures uniform clamping force across the sheet edges, preventing slippage and maintaining material tension during the process.

Common Materials

Steel, Aluminum alloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Clamping Force	50–200 kN	Must exceed forming force to prevent sheet slippage
Frame Size	1000–3000 mm	Custom sizes available per machine
Frame Thickness	20–60 mm	Thicker frames reduce deflection under load
Material Grade	6061-T6	Aluminum alloy for lightweight and corrosion resistanceASTM B221
Surface Treatment	Anodized 10–25 μm	Improves wear resistance and reduces frictionMIL-A-8625
Operating Temperature	-20–80 °C	Above 80°C may cause frame warping
Flatness Tolerance	±0.10 mm	Ensures uniform clamping pressureISO 1101
Parallelism Tolerance	±0.15 mm	Critical for even sheet stretchingISO 1101
Weight	50–200 kg	Heavier frames may require reinforced mounting
Max Sheet Thickness	1–10 mm	Thicker sheets require higher clamping force

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Frame Body Part
Main structural support that defines the forming area

Material: Steel
Clamping Mechanism
Applies pressure to secure plastic sheet edges

Material: Steel
Sealing Gasket Part
Creates airtight seal between frame and plastic sheet

Material: Silicone rubber

Manufacturers of Clamping Frame

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Frequently Asked Questions

What materials are used for the clamping frame?

The clamping frame is available in steel or aluminum alloy. Aluminum alloy 6061-T6 (ASTM B221) is specified for lightweight and corrosion resistance. The choice depends on the application requirements.

What is the typical clamping force range?

The clamping force ranges from 50 to 200 kN, depending on the sheet thickness and forming area. It must exceed the forming force to prevent sheet slippage.

What are the frame size and thickness options?

Frame sizes range from 1000 to 3000 mm, with thicknesses from 20 to 60 mm. Custom sizes are available per machine. Thicker frames reduce deflection under load.

What is the operating temperature limit?

The operating temperature range is -20 to 80°C. Above 80°C, the frame may warp, so it is important to stay within this range.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 1 bar vacuum pressure (atmospheric to full vacuum)
other spec:	Frame deflection < 2mm under full vacuum load
temperature:	Ambient to 150°C (typical plastic forming range)

Clamping Frame

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