edge burr tolerance aluminum sheets

Burr is a rough remainder of material outside the ideal geometrical shape of an external edge, or a residue of machining or of a forming process (Fig. 22.1). Undercut is a deviation inside the ideal geometrical shape of an internal or external edge (Fig. 22.1).

Sheet Metal Guage Tolerances During the rolling process the rollers bow slightly, which results in the sheets being thinner on the edges. The tolerances in the table and attachments reflect current manufacturing practices and commercial standards and are not representative of the Manufacturer's Standard Gauge, which has no inherent tolerances.

Sep 25, 2019· A burr isn’t a sharp edge, it’s more like a sharp little tooth sticking up from the cut edge. Burrs are a result of plastic deformation, which is what happens when metal is sheared. Some metals deform more than others, and so form larger burrs. Generally speaking, it’s softer metals like aluminum that create the biggest problems.


between the punch and die edges, and leaving a burr around the bottom edge. Burrs Burrs, like parting lines in plastics or flash on castings, are normal by-products of the metal stamping process. Blanking burrs are usually somewhat ragged, uneven and sharp. They can vary in height as punch and die edges become dull, but generally, up

文件大小: 432KBFive Burr Classes. Five standard burr classes were developed. Burrs can form on all types of

Fingernail inspection. Draw the end of the fingernail over the edges. If the fingernail hangs up, slows, or experiences a slight upward motion, a burr or raised metal exists at the edge. This technique often can detect burrs as small as 0.0005 in. high. Sharpness is detected by drawing the top surface of the fingernail lightly over the edge.

Grain structure in the metal sheet is critical for avoiding cracks in sheet-metal parts with lugs or tabs that are cut on three sides and bent in or out. Other components are often mounted or


scrap breaking away in a line between the punch and die edges, and leaving burrs around the bottom edge. Shearing Shearing is a process for cutting sheet metal to size out of a larger stock such as roll stock. Shears are used as the preliminary step in preparing stock for the stamping processes, or smaller blanks for CNC presses.


Visual Quality Characteristics of Aluminum Sheet and Plate has been compiled by the Technology Committee of the Sheet and Plate Division as a reference for those who have an interest in these rolled products and who may have a need to know the terminology commonly used in this largest segment of the alu-minum industry.


Designers, Specifiers and Buyers Handbook for Perforated Metals Page 4 of 124 The Wonderful Things That Holes Can Do As consumers, we are not given to wonder much about the work that holes do for us. But, for the product designer or architect, holes in sheet metal can provide the perfect solution to a multi-faceted design problem.

Commercially mined ore of aluminum Belled Edge Excessive buildup of material on edge(s) of a coil during a rewinding operation. Typical causes include excessive edge burr, turned edge, and “dog bone” shaped cross sectional profiles. Bend Radius The inside radius of a bent section. See “Minimum Recommended Bend Radii” in Technical Manual

Following DFM Guidelines for Working with Sheet Metal. In cases where holes must be near the edge These bushings are well suited for fixtures made from aluminum

Squareness In addition to achieving a certain length and width tolerance, shearing is used to make a sheet square. Checked for by measuring the distance between diagonally opposing corners, the amount a sheet is out-of-square is determined by taking 1/2 the difference of the measurements.

Edge surfaces of cut sheet metal are not typically smooth and straight. Even in properly cut metal, the fracture zone will be angled and rough. In sheet metal cutting, the lower the clearance value the higher the edge's quality. Shaving is a secondary process that can be used to improve edges of cuts that have already been made.

Breaking sharp edges and deburring. Some machining processes often create rough edges and ridges known as burrs. These not only pose a risk of injury, but also influence the dimensional tolerance of the workpieces. For these reasons, the burrs must be removed. There are various methods of doing this such as grinding, milling or barrel finishing.

The length shall be measured along one of the longer edges of the sheet/plate. Width tolerance. For wide strip and sheet/plate cut from wide strip with thickness < 10mm, the tolerance on width is +20/-0 for mill edges and +5/-0 for slit edges. For thickness > 10mm, the width tolerance shall be agreed at the time of enquiry and order.

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Hardening along the edge of the blanked part or workpiece, and; Creating excess roll-over and burr if the clearance is excessive. The most common materials used for blanking include aluminum, brass, bronze, mild steel, and stainless steel. Due to its softness, aluminum is an excellent material to be used in the blanking process.

Problems that can arise during metal slitting include poor edge quality, edge burr, edge wave, camber, crossbow, knife marks, and slit width that is out of specification. Some slitting problems can be attributed to poor metal quality; however, it is much more common for the problems to be caused by other variables and factors during the slitting process.


1. Regular cut dimension tolerance −JIS B 0405 1991− Tolerances for length excluding chamfered portion Units: mm 2. Tolerance for length of chamfered portion (radius of rounding for edges and edge chamfering dimension) 4. Regular perpendicularity tolerance JIS B 0419 −1991− Units: mm 5.


A systematic experimental investigation is presented on trimming of aluminum alloy autobody sheets. The variations of cut surface quality and burr height are related to the cutting parameters of

Waterjet is a CNC machine tool process of cutting metals as well as a wide variety of other materials such as titanium, Inconel, brass, tool steel, glass, stone or ceramics, and composites. By concentrating a narrow column of water and abrasive garnet at up to 60,000 PSI, complex shapes are cut with superior edge quality and minimal burr.


Edge to edge, or hole to hole, or Edge or hole to bend* Bend to bend* Angular Tolerances edge to hole. ( NO BEND AREA) FLAT 0.25" or less (6.0mm or less)