CNC, 3D printing, sheet metal and other processes, professional production of a variety of metal, plastic hand model.

Phone

+86-769-8553-5121

Inspection specification for sheet metal products

Apr 15,21

Inspection specification for sheet metal products

Objective: to clarify the inspection methods and quality requirements of the parts produced in each process of sheet metal production, and standardize the inspection standards, so as to control the product quality in each process
Scope of application this specification is applicable to the production process inspection and quality control of sheet metal parts from NC programming, stamping and cutting, bending and welding.
Quoted standards: 1. Dimensions not indicated in this standard are in mm; 2. General tolerances not indicated are in accordance with GB / t1804-2000; tolerances of linear and angular dimensions not indicated; 3. Drawings, technical documents and process standards are used at the same time. In case of conflict, technical specifications and customer requirements shall prevail. Inspection specification NC programming inspection specification: inspection tool: computer programming software
Inspection method: full inspection
Inspection contents and methods:
1.1 the unfolding dimension of the product shall be unfolded according to the specification for programmed unfolding coefficient, and the unfolding dimension shall be correct; 1.2 the opening size and position dimension of the product shall be correct; 1.3 the cutting angle of the product shall meet the bending requirements, and the cutting angle of the door panel shall be wrapped; 1.4 for the CAD drawing unfolded with UG, the hole diameter of some stretch forming holes shall be modified according to the drawing, and the hole omission phenomenon shall be checked, and the defects caused by UG unfolding shall be deleted 1.1 check the drawing program of each contract, need to check the CAD drawing and cam drawing; 1.2 check the typesetting: whether the drawing number and quantity of the attached product are consistent with the process list; whether the typesetting drawing number and quantity of all main parts (large products) are consistent with the process list; do a good job in the special design of each contract Inspection record, check programmer's self inspection and mutual inspection record; stamping inspection specification inspection tool: visual inspection
Inspection method: patrol inspection
Inspection contents and methods:
1.1 visual inspection of punching burr: whether the punching burr is smooth; whether the punching burr is large and forms a fast opening, The operator is required to clean the burr, check the use of the mold, and replace the mold if necessary; 1.2 check whether there is punching deviation [product deviation caused by plate shaking during stamping: such as large mold binding and micro connection point (micro connection size is 0.1 ~ 0.2mm)]; whether the thickness of the plate is consistent with the product requirements, whether the type of plate is consistent with the technical description; whether the depth of the forming hole meets the requirements Drawing size requirements, whether the drawing hole is in the center position, whether the hole diameter after stretching meets the requirements; whether the unqualified products and qualified products are mixed; whether self inspection marks are pasted, self inspection and records are made; laser gas cutting inspection specification inspection tools: visual inspection
Inspection method: patrol inspection
Inspection contents and methods:
Visual inspection of cutting burr: unqualified phenomenon: cutting burr or wavy cutting edge, small round hole out of round, round hole cutting edge is not smooth, small round hole is not cut down. It is required to operate and deal with the unqualified products; check whether there is cutting deviation phenomenon [laser cutting head collides with the parts and causes the plate to move; if the product contour is not completely cut down, the part contour is broken in details]; whether the unqualified products are mixed with the qualified products; whether the self inspection record (yellow quality assurance sheet) is filled in; whether the thickness of the plate is consistent with the product requirements; laser welding inspection Standard inspection tools: visual inspection, vernier caliper
Inspection method: first inspection (in accordance with the regulations on the first inspection products in the inspection management system for self made sheet metal parts), patrol inspection and full inspection.
Inspection contents and methods:
Visual inspection of welds: no weld leakage, porosity, fracture, undercut and depression, even welds, uneven box need to be re welded; inspection of side plate and stiffener welding: use tape to measure the position and spacing of welding line to meet the requirements of the drawing; splicing weld position inspection: use vernier caliper to check that the butt weld at 3mm plate thickness is covered by 2mm wide laser welding seam, without welding deviation. Re welding is required for the deviation of weld seam; inspection of weld penetration welding effect: the weld scar inside the box body is uniform and no segmentation phenomenon, a small amount of welding slag blooms at the weld seam, and re welding is required if it does not meet the requirements; whether there is mixing phenomenon between unqualified products and qualified products; self inspection by operators as required and make self inspection records; inspectors make inspection records; bending inspection standardizes inspection tools : visual inspection, tape measure, vernier caliper, angle detection block or universal angle ruler
Inspection method: first inspection (according to the regulations on the first inspection of products in the sheet metal self made parts inspection management system), patrol inspection
Inspection contents and methods:
Visually check that the bending direction is consistent with the drawing direction; use vernier caliper and tape to check whether the bending height is consistent with the drawing height and whether it meets the assembly dimension requirements; use tape to measure the product forming dimension and the forming dimension is consistent with the drawing dimension; use angle measuring block or universal angle ruler to measure the bending angle, Whether the bending angle is consistent with the drawing, and whether the angle of the whole bending edge is consistent; the zinc plate with repeated folding needs to be bent on the ball mold, and the crease requirements: no zinc layer damage by visual inspection, no uneven phenomenon by hand touch; no directional bending by visual inspection, no cracking by visual inspection of repeated folding; the operator pastes self inspection marks and makes inspection records according to the requirements; no bending Whether the qualified products are mixed with the qualified products; the inspector shall make inspection records; the welding inspection specification inspection tools: visual inspection, tape measure, vernier caliper, angle detection block or universal angle ruler
Inspection method: first inspection (according to the regulations on the first inspection of products in the sheet metal self made parts inspection management system), patrol inspection
Inspection contents and methods:
Visual inspection of weld scar and weld: the weld is firm and uniform, and the weld scar has no defects such as crack, incomplete penetration, weld through, notch and undercut. The length and spacing of welding seam shall meet the technical requirements of the drawing; after welding and grinding, there shall be no welding slag, welding spot, burr, etc., and the welding seam shall be smooth and flat. It should be ensured that the edge of the workpiece is even and the surface is flat, and there is no concave convex phenomenon on the surface. The welding position and dimension of the parts are consistent with those indicated in the drawing; the welding parts are consistent with those indicated in the detail list of the welding drawing and are qualified products; the welding direction of the products is consistent with that of the drawing; the products are free of missing welding and non grinding phenomenon; the employees produce according to the operation specifications, conduct self inspection and make inspection records; the inspectors make inspection records; the completion inspection specifications before the transfer: inspection tools: Visual inspection, tape measure, vernier caliper, angle detection block or universal angle ruler;
Inspection method: full inspection according to product type;
Inspection contents and methods: integrate the above inspection specifications, inspect according to the drawings and process requirements, be responsible for the quality of the inspected products, and make inspection records;
 
×