Editorial Technical Reference

Crown

This page explains how Crown 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

The upper structural beam of a precision press frame that provides rigidity and support.

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Product Specifications

Technical details and manufacturing context for Crown

Definition

The crown is the top horizontal structural member of a precision press frame, serving as the primary load-bearing element that connects the two upright columns. It provides the necessary rigidity and stability to maintain precise alignment during high-pressure stamping or forming operations, ensuring consistent part quality and dimensional accuracy. The crown is typically manufactured from steel, cast iron, or welded steel plate, with material grades such as Q235–Q345 per GB/T 700, and surface hardness in the range HB 160–220 per GB/T 231.1. Key parameters include a maximum load capacity of 100–500 tons, crown height of 300–800 mm, width of 1000–3000 mm, and depth of 600–1500 mm. Flatness and parallelism tolerances are specified as ±0.05 mm and ±0.08 mm respectively, per ISO 1101, which are critical for die alignment and uniform pressure distribution. The crown operates within a temperature range of -10 to 60 °C and weighs between 2 and 10 tons, affecting shipping and installation. As a component, the crown must be selected and verified against the specific press model and application. Always confirm model-specific values and standards with the legal manufacturer or supplier before procurement or use.

Working Principle

The crown functions as a stationary beam that absorbs and distributes the compressive forces generated by the press ram during operation. It works in conjunction with the bed (base) to create a rigid, closed-loop frame that prevents deflection and maintains parallelism between the ram and bed surfaces under load. The crown's structural rigidity and dimensional tolerances ensure that the press maintains accurate alignment, reducing wear on dies and producing consistent parts.

Common Materials

Steel, Cast Iron, Welded Steel Plate

Technical Parameters

Parameter	Typical range	Notes & selection driver
Maximum Load Capacity	100–500 t	Determines press tonnage capability
Crown Height	300–800 mm	Affects press stiffness and stroke
Crown Width	1000–3000 mm	Matches bed width
Crown Depth	600–1500 mm	Affects tie-rod spacing
Material Grade	Q235–Q345	Higher grade for higher loadsGB/T 700
Surface Hardness	HB 160–220	Ensures wear resistanceGB/T 231.1
Flatness Tolerance	±0.05 mm	Critical for die alignmentISO 1101
Parallelism Tolerance	±0.08 mm	Ensures uniform pressure distributionISO 1101
Operating Temperature	-10–60 °C	Beyond range may affect material properties
Weight	2–10 t	Affects shipping and installation

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

Ram Mounting Surface Part
Precision-machined flat surface where the press ram is attached

Material: Steel
Column Connection Flanges Part
Machined interfaces that connect the crown to the vertical columns

Material: Steel
Reinforcement Ribs Part
Internal structural supports that increase rigidity and prevent deflection

Material: Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Precision Press Frame

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Manufacturers of Crown

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Frequently Asked Questions

What is the primary function of a press crown?

The crown is the top horizontal beam of a precision press frame. It connects the upright columns and provides rigidity and support, helping to maintain alignment during stamping or forming operations.

What materials are commonly used for press crowns?

Common materials include steel, cast iron, and welded steel plate. Material grades such as Q235–Q345 per GB/T 700 may be specified, with surface hardness typically in the range HB 160–220 per GB/T 231.1.

What tolerances are critical for a press crown?

Flatness tolerance is typically ±0.05 mm and parallelism tolerance ±0.08 mm, per ISO 1101. These tolerances are critical for die alignment and uniform pressure distribution.

How does the crown affect press performance?

The crown's load capacity, dimensions, and rigidity directly influence the press's tonnage capability, stiffness, and stroke. Proper selection ensures stable operation and consistent part quality.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 500 MPa (dependent on material grade and design)
temperature:	-20°C to 150°C (operating range for typical steel alloys)
fatigue cycles:	≥10^7 cycles at rated load (industrial duty standard)
deflection limit:	≤0.1 mm/m under max load (precision press requirement)

Crown

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