General machinery parts inspection specifications

General machinery parts inspection specifications

Scope of application

Guide the QC department's daily work

Work instructions

Work assignment:

QC inspection work arranged by the team leader, dispatch and control.

QC team leader when arranging QC work, must check difficulty of specific analysis of the workpiece, and the combination of QC working experience into consideration to dispatch.

QC team leader in assigning QC work, should pay attention to whether or not was assigned the artifacts that ever appeared quality problem, alert QC, in order to prevent the same problem again.

QC work should be focused, serious and responsible. If in doubt to reflect in time, guiding by team leader.

Inspection plan

All inspection items: for plating color appearance, same size consistency.

Sampling: batch < 50 PCS, sampling 5 pieces.

The basis of inspection and priorities:

First recognized by material books, is the drawing, the third for this inspection specifications.

Inspection equipment

Vernier caliper Micrometer height gage Angle ruler

Feeler gauge needle thread gauge ring gauge

Marble platform Projector secondary yuan Pure water

Methylated alcohol isopropyl alcohol test fixture, color plate, sand sample or sign the sample

Inspection steps

Controlled versions of your drawings, if consistent with the physical.

Whether the number and count your drawings are in conformity with actual

Identify the drawing requirements of material, is consistent with the physical.

Review technical specifications. Pay attention to:

If there is a symmetrical parts.

Different types of heat treatment, finish, etc on the processing requirements.

Note that English/Japanese.

Review drawings appearance, size, shape tolerance requirements, finish, etc., decide to check method, the reasonable selection of measuring tool, ensure the quality of detection.

QC in order to test artifacts, check out a size, make a mark, cannot leak.

Check out the bad product, by the team leader or factory department to confirm whether the repair, scrap.

Inspection signed inspection records, the workpiece according to the requirements for cleaning, counting packaging, paste the logo.


Matters needing attention

When you plan approval by drawing chapter is ambiguous, if leakage process.

Drawing number theory only many cannot little.

Review all materials, avoid the wrong material, mixing.

Check whether there is leakage processing.

Drawings for heat treatment, the oxidation, pay attention to whether the derusting, allowance, plugging holes, oxidation of tapping processing before quenching and so on.

Note that the parts drawings with other discrepancies, such as in the opposite direction.

Commonly used materials;

Aluminum: AL6061, LY12, A5052, 7075, 2014

Brass: C3604, C2801P, PTFE, H62 brass: C5241, BC6

Stainless steel: SUS303 SUS304, SUS301, SUS302 can heat treatment of stainless steel: SUS440C

White steel: white POM, Dtrlin black steel: black POM iron Christopher dragon: PT iron, hot rolled plate: SPHC iron (manufacture) : (SPCC)

Chrome steel, SKD, NAK55, NAK80:45 # steel SS400, SGD400 - D

Appearance check

Appearance of examining conditions

Vision: vision correction above 1.0

- visual range: class A surface 40 eyes examined object distance ㎝, B and C an arm away from eyes.

-- visual Angle of 45 degrees to 90 degrees (rotates products should be check)

- visual time: class A surface 15 seconds/level, B and C 10 seconds/level

- lights: the greater than 500 lux lighting degrees

Terms and definitions

A level surface, in use process always seen by the customer part (such as: shell of positive and end face, and after the shell top surface, handle, lens, buttons and keyboard positive, probe the entire surface, etc.).

Class B surface: in use process often seen by the customer part (such as: surface around the side shell, pan or after the left and right side on the back of the shell, etc.). The surface to allow slightly bad, but not picky customers don't buy the product.

C level surface: in use process is rarely, if ever the customer noticed that the surface of the part (such as the shell of the underside, pan or after the bottom shell, the surface of the internal parts). This the appearance of the surface defects should be reasonable and not think of the poor quality of the products to clients.

: D surface during use by customers hardly see some (such as: the product of the surface of the internal parts). The defects on the surface of the reasonable, can't affect the parts performance.

Metal surface, such as electroplating, oxidation, passivation of metallic surface, the coating surface.

Drawing: is a kind of abrasive belt grinding, on metal surface by abrasive belt grinding, removing surface defects, and form a certain roughness, uniform grain decorative surface.

Substrate spotted: before plating or oxidation due to corrosion of substrate material, the impurity in the material, material microporous wait for a reason, with the surrounding material surface caused by the different gloss and roughness of patch shape pattern appearance.

Polishing area: on the base material of corrosion, scratches, welding, riveting and other parts for mechanical grinding polishing after showing the local high gloss, brightness of area.

Scratches before plating: refers to material scratch before oxidation, electroplating or due to improper operation, or coarse grinding of obvious deficiencies in man-made scratch or local friction trace on the substrate material, usually with fine lines.

Shallow scratches: film scratches on the surface, but did not hurt the bottom (i.e., the underlying unexposed); With no other film surface for visual is not obvious, fingernail to touch without AoTuGan, and material ontology wound was not hurt.

Deep scratches, scratches on the surface membrane, and has harm to the underlying (i.e., the bottom has been exposed); With no other film surface for visual touch has obvious, fingernail AoTuGan, injury and material ontology.

Pits: as the substrate material defects, or improper operation, such as in the manufacturing process of reason in the material surface traces of the small hole.

Concave and convex marks: for base material subjected to impact or the bad profile and presents obvious deformation, such as uneven phenomenon, touch from time to tome rough feeling.

Burns: wire drawing processing caused by improper operation parts surface traces of the ablation of overheating.

Watermark: after plating or oxidation for water failure to dry or dry cleaning not thoroughly formed by the markings.

Thief: galvanized passivation membrane removal by friction, showing a new layer, or caused by gap intercept solution without passivation film phenomenon, to distinguish it from surrounding color white.

Mist: chrome plating, nickel plating on the surface of the phenomenon of fuzzy, not clear, do not light.

Inclusion particles: due to material or foreign substance, such as welding slag and formed in the surface, the influence of color and normal surface consistent bump phenomenon.

Linked with printing: refers to the electroplating, oxidation, spraying, such as surface treatment process, because of the shade of hanging with auxiliary tools and make its contact with parts in parts of the local phenomenon without membrane layer.

Graphic damage: printing graphic for partial loss or abrasion, adhesion, pollution caused by the graphics, such as incomplete handwriting is not clear.

Porosity: when welding the air bubble in the molten weld solidification of the molten pool has not transgression and the holes of the formation of remnant.

Slag, residues after welding welding slag in the weld.

Flash: during the welding process, flowing molten metal outside the weld is formed on the parent metal without melting metal.

Visual inspection method

Use materials should accord with the requirement of valid version drawings, material itself should be no deformation, scratches, oxidation discoloration

Surface is smooth, smooth, without burr, deformation, corrosion, cracks, slag inclusion, porosity, compressive and flexural strength, etc.; Embedded parts, riveting pieces should be stable, no looseness, thread no defect, no corrosion, etc.; There is no processing residue;

Parts of the layer of plastic and spray paint should be uniform, continuous, no shrinkage cavity, blister, crack, peeling, pulverization and sag, panty-less (lax) local no coating or coating cover, fingerprints and other defects;

Heat treatment method should conform to the requirements of the valid version drawings, should not have burnt after heat treatment, the oxidation and decarbonization, cracking, deformation, the surface grain size of the spots, warping, and not all bad phenomenon;

Surface treatment shall conform to the requirements of the valid version drawings, surface smooth level off, without spots, burning, bubbles and water lines, coating, coating is not complete and electroplating acid filter residue, etc

After surface treatment, surface parts is allowed inevitable minor fixture marks and slight watermark; In the case of does not affect the assembly, the side, edges and corners allow slightly rough; Allow the important surface have slight water lines, or individual spots;

Deburring requirements: along the edges of parts machining with the hand touch any position and direction are no scratch CARDS.