51吃瓜

Sheet Metal Processing is a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching, bending, welding, riveting, mold forming, and surface treatment. ?? ?? ??? ??? ?? ?? ?? ??? ?? ???? ?? ????? ????? ???

Sheet metal processing method: Non mold processing: The process of sheet metal processing through equipment such as numerical punching, laser cutting, shearing machines, bending machines, riveting machines, etc. It is generally used for sample production or small batch production, with high cost. ????? ???? ???? ??? ??? ???? ???? ???? ??. Mold processing: Using fixed molds to process sheet metal, there are generally cutting molds and forming molds, mainly used for mass production with lower costs. ???? ??? ?? ???? ???? ?? ??? ????? ?? ????? ??? ?? ???? ??. ????? ???? ???? ??? ???? ?? ??? ??? ?? ???? ???? ??. Sheet metal processing process: cutting: numerical punching, laser cutting, shearing machine

Forming - bending, stretching, punching: bending machines, punching machines, etc

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The connection method of sheet metal

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Sheet metal processing technology - The main cutting methods for sheet metal include numerical punching, laser cutting, shearing machines, and mold cutting. CNC is currently a commonly used method, and laser cutting is mostly used in the sampling stage (or can also process stainless steel sheet metal parts), with high processing costs. Mold cutting is mostly used for large-scale processing.

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Numerical punching, also known as turret CNC punching machine, can be used for cutting, punching, stretching holes, rolling ribs, punching blinds, etc. Its machining accuracy can reach+/-0.1mm.

CNC ??????? ??? ?? ????? ??:

????? ??? ??? ??? ??? ???? 4.0?

???????? ???? 5.0?

?????? ???? ???? 2.0?

Punching ?? ??? ?? ?????? ?? ????? ??. ??????? ?? ?????? ?????? ????? ?? ???? ???? ?? ?????? ????? ??? ???? ?? ???? ?? ???? ??. (???? ?? ????? ??? ?????? ???? ??)

2. ??????? ???? ?? ??? ??? ????? ???. ?? ??????? ?? ????? ??? ???? ????? ?? ??? ????? ?? ?????? ???? ????? ??? ?? ??? ????? ?? ????? ???? ???? ?? ???? ????? ??? ??? ?? ?? ?? ???? ????? ?? ????? ?? ?? ?? 1.5t ?? ?? ?? ???? ?????? (???? ???? ?? ????? ??? ?????? ???? ??)

3. ?? ???? ??????? ???? ??????? ???? ???? ??? ????? ?? ?????? minimum distance is 3T, the minimum distance between two stretching holes is 6T, and the minimum safe distance between the stretching hole and the bending edge (inside) is 3T+R (T is the sheet metal thickness, R is the bending fillet)

4. ?? ????? ????? ??? ????? ????? ?? ?????? ???? ????? ???? ??? ??? ???? ???? ??? ???? ???? ????? ???? ??? (???? ???? ?? ????? ??? ?????? ???? ??)

Sheet metal processing technology - Forming sheet metal mainly involves bending and stretching the sheet metal.

1. Sheet metal bending 1.1 Sheet metal bending mainly uses bending machines.

?????? ????? ?? ????? ????? ??

??? fold:+/-0.1mm

Half Fold:+/-0.2mm

20% ?? ????? ???????:+/-0.3mm

????? ???? ????? ?? ?????? ??? ?? ?? ?? ???? ?? ??? ????? ?? ??? ??? ?? ????? ???. ????? ??? ???? ????? ???? ??? ???? ???? ?? ?? ??? ????? ???? ?? ???? ??? ?? ??? ?? ????

1.3 ????? ??? ???? ?? ???:

???? V-groove ???:

1.4 ???? ????? ?? ???? ???? ???? ?? ??????:

?? ???? ??? ???? ?? ?? ?????? ???? ????? ???? ?? ??? ????? ???? ????? ???? ????? ??? ???? ???? ?? When the material thickness is constant, the smaller the internal r, the more severe the tension and compression of the material; ?? ???? ???? ?? ????? ?? ???? ?? ???? ???? ?? ???? ??? ?? ????? ???? ??? ???? ??? ???? ??? ????? ??? ?????? ???? ???? ?? ?????? ????? ?? ??? ????? ???? ???? ?? ???? ?????? ????? ??? ?????? ??????? ???? ???? ?? ???? ????? ??? ?????? ???? ??.

??? ????? ?? ??? ?? ?? ?? ?????? ?????? ????:

????? ????? ????? ?? ????? ????? ?? ??? ????? ???? ?? ??? t ????? ?? ????? ??

???? ???? ?? ????? ????? ?? ???? 1.5 ??:

????? ??? ??? ????? ????? ????? ?? ???? ??? ????? ?? ???? ?????? ??? ????? ???? ?? ????? ?? ??: h>2t

??? ??? ???? ?? ????? ????? ?? ???? h2t ?? ????? ?? ??? ???? ??? ??? ???? ?? ???? ????? ????? ??? ?? ?? ????? ?? ?????? ??? ???? ?? ??? ????? ????? ?? ?? ?? ??? ?? ??? ????? ?? ??????? ?? ????? ??? ??????? ?? ???? ??? ??????? ?? ????

1

?? ??? ??? ?? ????? ?? ??? ??? ??? ??? ?? ???? ??? ?? ????? ?? ?????? ????? ??: h=(2-4) t> 3?

1.7 ???? ????? ?? ???? ?? ????? ?????:

Hole edge distance: Punch the hole first and then bend it. The position of the hole should be outside the bending deformation zone to avoid deformation of the hole during bending. ???? ????? ?? ???? ????? ?? ????? ???? ???? ??? ?????? ???? ??.

1

The bending line of the bent part should avoid the position of sudden size changes. ?? ??? ???? ?? ????? ?? ??? ???? ?? ???? ??? ????? ???? ???? ?? ??? ?? ????? ?? ??????? ??? ??? ?????? ??? ????? ???? ?? ????? ???? ????? ???? ??? ????? ????? ?? ????? ???? ?? ?? ????? ????? ?????? (????? a) ??? ???? ???? ?? ??? ???? ???? (????? b) ???? ???? ?? ??? ???? ?????? ?? ?????? ?? ????? ?? ???? ???: SR; Slot width kt; ???????? Lt+R+k/2.

1.9 ???? ?? ?????? ?? ???? ????? ??? ???? ????? ?? ?????? ????? ?? ????? ????:

1.10 Design requirements for sheet metal pleats (dead edges):

??? ??? ??? ?? ????? ????? ?? ???? ???? ?? ????? ?? ???? ??. ???? ???? ?????? ??? ?????? ???? ??? ??? ????? ????? ?? ?? ???? L3.5t+R ??.

?? ?? ??????? ?? ????? ????? ?? ????? ??? ??? R ???? ?? ???? ?? ???? ?? ???? ?? ????? ??? ?????? ???? ???

1.11 ???? ?????? ????? ??? ??? ???:

???? ??? ??? ???? ?? ????? ?????? ?? ????? ???? ??? ??? ?? ??? ???? ?? ???? ?? ?????? ????? ?? ?????? ?? ??? ?? ???? ????? ?? ?????? ?? ????? ???? ?????? ???? ???? ????? ??? ?????? ???? ??. Especially for parts that have been bent multiple times, the process holes must be used as the positioning reference to reduce cumulative errors and ensure product quality.

?? ???? ???? ?? ?????? ???? ???? ?? ?????? ?????? ?? ??? ??? ???? ?????:

?? ??? ???? ?? ????? ??? ?????? ???? ??? a) ???? ???? ??? ??? ??? ???? ??? L ?????? ?? ???? ???? ???? ?? ??? ???? ??? ??? ?????? ????? ??. (b) ??? ?????? L ?? ??? ???? ?? ????? ???? ?? ?? ???? ???? ?? ??? ????? ?? ??? ??? ???? ?? ?????? ???? ?? ?? ?????? ?? ??? ???? ???

??? ?? ???????? ??? ??? ?? ?? ???? ????? ?? ???? ?? ????? ???? ???? ????? ?? ?????? ?????? ????? ?? ????? ???? ?? ?????? ??? ???? ???? ?? ????? ???? ?????? ?????? ?? ???? ?? ???? ?? ??? ?? ???? ?? ????? ?? ????? ??? ?????? ?? ???? ??? ?? ??. ??? ????? ??? ?? ?????? ???? ?? ??? ???? ?? ?????? ???? ???? ???? ?? ?????? ???? ????? ???? ?????? ??? ??? ????? ?? ???? ??? ????? ???? ????? ?? ??? ??? ???? ??? ??? ???? ????? ??? ??? ???????? ???? ?? ???? ????????? ???? ?? ?? ?? ???? ???? ???? ?????? ???? ????? ??? ?????? ???? ??: ?????? ????? ??? ????? ????? ?? ??? ???? ??? ??? ???? ?? ??? ??? ????? ???? ??????? ???? ????????? ?? ??? ???? ??

2. Sheet metal stretching The stretching of sheet metal is mainly completed by CNC or conventional punching, requiring various stretching punches or molds.

??????? ???? ??? ?? ??? ???? ???? ?? ???? ??? ???? ???? ????? ??? ???? ???? ?? ??? ??????? ??? ????? ??????

???? ?? ?? ????? ????? ??????? ?? ????? ?? ?? ?? ??? ???? ??? ??????? ?? ????? ???? ??????

????? ?? ????? ?? ????? ????? ???? ?? ??? ?? ?? ????? ?? ?? ?????? ??????? ?? ??? ????? ????? ?? ????????

2.1 ????? ????? ?? ???? ??? ????? ????? ?? ?????? ???? ?????? ?? ????? ??:

???? ?? ???? ?? ????? ??? ?????? ???? ??? ??????? ???? ???? ?? ???? ??? ????? ????? ?? ?????? ???? ?????? ?? ????? ??? ???? r1t. ?? ??? ?? ??????? ???? ???? ????? r1=(3-5) t ?? ??????? ?? ??? ???? ??? ??? ?? ?? ?? ???? ????? ?? ?? ?? ????? ???? ????? ?? 8 ????? ???? ?? ???? ??? ?? r18t ??.

2.2 Rounding radius between the flange and wall of the stretched part

????? ??? ??????? ??? ?? ?????? ???? ?? ?????? ???? ?? ?? ???? ?? ????? ???? ?????? ???? r22t. ?? ??? ?? ??????? ?? ????? ???? ????? r2=(5-10) t ??????? ??? ???? ??? ??? ?? ?? ????? ????? ?????? ???? ?? ??????? ?? ?? ?? ????? ???? ?????? ???? r28t. (???? ?? ????? ?? ??? ?????)

2

?????? ???? ?? ????? diameter D d+10t ?? ??? ?? ???? ?????? ???? ???? ???? ???? ???? ?? ??? ???? ?? ???? ???? ???? ???? ???? ?? ?? ???? ???. (???? ?? ????? ?? ??? ?????)

2.4 ??????? ?????? ??????? ????? ?? ????? ??????? ?? ??????

??? ?????? ??????? ???? ?? ????? ??????? ?? ?????? ???? ?? ?????? r3 3t ?? ??? ?? ???? ?????. ?? ??? ?? ??????? ?? ????? ?? ???? r3 H/5 ?? ???? ?? ???? ?? ???? ????? ???? ?? ??? ???? ??? ????? ?????.

2.5 ???? ????? ?? ??? ???? ??? diameter ?? ?????? ?????? ?? ?????? ?? ??? ????? ???

?? ??? ??? ??? ????? ????? ?? ???? ???? ???? ??? ???? ???? ?? ?? ????? ?? ???? 0.4 ?? ?? ?? ????? ???? ?????? ???? H/d 0.4 ?? ????? ???? ???? ?????? ??? ?????? ???? ??.

2.6 ??????? ???? ???? ?? ???? ?????:

?? ???? ?? ????? ?? ????? ??? ?? ???? ??????? ???? ???? ?? ????? ??? ?? ???? ??. ????? ??? ?? ??? ???? ??? ???? ????? ???? ?? ???? ??? ???? ???? ??? ???? ?? ????? ????? ??? ???? ???? ?? ???? ??? ???? ?? ????? ???? ????? ???? ???? ????? ???? ?? ???? ??? ??? ????? ????? ???? ??? ?? ??? ????? ???? ????? ?? ????? ??? ???? ????? ????

2

?? ??????? ?? ????? ????? ?? ???? ???? ????? ????? ?? ?????? ???? ??? ?? ???? ?????? ????? ?? ???? ??? ????? ?????? ????? ??? ?? ???? ???? ??? ????? ??? ???? ?????? ??? ???? ???? ???? ?????? ??????

2

??? ??? ??? ???? ??? ????????? ???? ?? ???????? ???? ?? ????? ?????? ?? ?? ??? ??? ??? ???? ??? ????????? ???? ?? ???? ???????? ???? ???? ??? ??? ????????? (GB) ??? 16 ?? ????? ???? ?? ???? ????? ???? ?? ???? ???? ?? ???? ????? ???? ?? ????? ????? ??

3. ??? ??? ?? ????? ???: ????? ?? ?????? ????? ???? - ??? ??? ????? ?? ????? ?? ??????? ?? ??? ???? ???

???? - ???? ???? ????? ???????? ?? ???????? ??? ??????? ??? ???? ??? ?? ??????? ??? ???? ?? ???? ???? ?? ????

??? (??????? ???? ?????) ????? ???? ?? ??? ??????? ??? ???? ?? ?? ????? ?? ?????? ?? ???? ??? ????? ??? ???? ???

3.1 Reinforcement:

??????? ??? ???? ??????

????? ????? ??? ????? ??? ????? ?? ??? ?? ?? ????? ?????? ???? ?? ????? ?????? ??? ???? ???.

3. 2 ????

???????? ?? ???? ???? ?? ????? ?? ?? ?? ??? ???? ?? ??? ?????? ??? ?? ????? ???? ?? ???? ???? ??????? ?????? ??? ?? ???? ??? ??? ???? ??????? ??? ??? ???? ?? ????? ???? ???? ??? ???? ?? ???? ??? ????? ??? ?????? ?? ???? ????????? ???? ???

????? ?? ?????? ?????? ???? ????? ??? ?????? ???? ??

???? ?????? ?? ?????: a4t; b6t；h5t；L24t；r0.5t。

3.3 Flanging of holes (stretching holes)

??? ?? ???? ????? ???? ??? ????? ?? ?? ????? ????? ???? ????? ???? ????? ???? ????? ???.

Sheet metal processing technology - other processed sheet metal accessories, such as rivet nuts, rivet bolts, rivet guide columns, etc.

2. ?? ??? ?? ???? ???? ?? ???.

Sheet metal thickness t< ???? ?.? ??? ???? ??? ?????? ?? ??????? ????. ?? ??? ???? ?? ?? ?.? ??? ????? ?????? ??????? ?? ???? ??.

Sheet metal processing technology - When welding in the design of sheet metal welding structures, it should be implemented to "symmetrically arrange welds and welding points, and avoid intersection, aggregation, and overlap. Secondary welds and welding points can be interrupted, and main welds and welding points should be connected."

?? ?? ???? ??? ???? ?? ??????? ??? ???? ??? ???? ??????? ?????? ??????? ????.

???? ??? ??? ??? ?? ?????? ???? ??? ???? ?????? ??? ?? ?? ????? ??? ???? ?? ??? 0.5 ??? 0.8? ?? ?????? ???? ?????. ???? ??? ??????? ??? ??? ???? ??????

2. ?????? ?? ??? ?? ????? ??? ????? ???? ?????? ???? ????? ???? ?????? ????? ??? ???.

???? ?? ???? ???? ??? ?????? ???? ???:

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???? ???????? ???? ?? ????? ?????? ?? ??? ???? ???? ???? ???? ??? ?????? ???? ??.

?? ??? ?????? ?? ???? ??? ?? ???? ???? ??????? ?? ?????? ????? ???? ??? ????? ?? ???? ??? ????? 40-50mm ?? ?? ????? ??? ???? ?? ???? ?? ???? ?????? ??????? ?? ?????? ????? 70-80mm ?? ????? ?? ???? ??.

???? ???? ????? ???? ??? ???? ?? ????? ???? ?????? ????? ??? ?? ??? ??? ??? ???? ?? ??????. ??? ???? ????? ??? ?? ????? ?? ?? ????? ??? ???? ?? ????? ?????? ???.

????? ??? ???? ?? ??? ?? ???? ?????? ??????? ??? ??? ??

?????? ?? ?????? ?? ??? ??? ??? ??????? 2 ???? ??? ?? ?? ?? ????? 3 ???? ?? ???? ??. ?? ???? ?? ??? ???? 1/3 ??? 3 ?? ?????? ???? ?????.

??? ??? ???? ???? ?? ?????? ???? ?? ??? ????? ?? ?? ???? ?? ???? ???? ???? ?? ?? ?? ???? ??. ??? ?? ????? ?? ?? ??? ?? ?? ?? ???? ??. ??? ?? ????? ???? ?? ?? ???? ????? ?? ???? ????? ?? ???? ???? ?????. ?? ???? ?????? ?? ??? ??? ????? ??? ?? ?? ???? ??.

Sheet metal processing technology - Connection methods: This mainly introduces the connection methods of sheet metal during the processing, including rivet riveting, welding (as mentioned above), hole drawing riveting, and TOX riveting.

????? ?????: ?? ????? ??????? ????? ????? ??? ?? ??? ?? ???? ????? ????? ????? ????? ????? ????? ????? ????? ?????? ???? ???? ??? ?????? ????? ????? ????? ????? ?????? ???? ????

2. ??? (?? ?? ???? ???? ??? ???) ????? ??? ?????: ??? ??? ????? ???? ????? ?? ??? ????? ??? ??? ????? ?? ?? ????? ?? ????? ??? ??? ???? ???? ???? ??? ??? ????? ??? ???

??????: ?????? ???? ???? ??? ?? ?? ????? ???? ???? ???? ?? ??? ?????? ?? ????? ??. ????? ???? ?? ??? ???? ?? ??? ????? ???? ?? ????? ???? ??

4. TOX ?????: ??? ???? convex mold ?? ????? ???? ??? ???? ??? ??? ?? ????? ??. ??? ????? ???? ?? ????? ???? ?? ???? ?? ???? ???? ???? ???? ??. ????? ?? ?? ?? ???? ????? ?? ?????? ?? ???? ?????? ????? ???? ??? ?? ?? ?? ????? ?????? ?? ??? ???? ????. ????? ??? ?? ??? ?? ??? ???? ???? ?? ???? ?????? ?? ??? ???? ???? ?? ??? ????? ?????? ?? ??????? ??? ??? ???? ??? ?????? ??? ??? ???? ???? ???? ?? ??? ????? ?????? ?? ??????? ??? ??? ?? ???? ??? ???? ????? ???? ??? ??? ?? ????? ?? ???? ????? ???? ????? ???. As shown in the following figure:

Sheet metal processing technology - Surface treatment can provide anti-corrosion protection and decorative effects on the surface of sheet metal. ??? ??? ?? ???? ??? ???????? ??? ???? ?????? ?????????????? ??? ??? ???????? ??? ?????? ??? ?????? ?????? ?????? ??? ???.

??? ??? ?? ??? ????? ?? ????? ??? ?????? ???? ????? ????? ??? ????? ??? ??? ?? ??? ?? ??? ??? ???? ??.

???? ?????: ?? ??? ?? ??? ?? ??? ??? ????? ???? ??: liquid ??? pulver paint. ??????? ??????? ??? ???? ?? ?? ???? ??? ??. ????? ?????????? ??????? ???? ????? ????? ??? ????? ????? ?? ?????? ?? ??? ?? ??? ?? ????? ??? ?? ??? ???? ????? ??? ???? ?? ???? ?? ????? ???? ??? ??? ???? ?? ??? ??????? ?? ????? ????? ???. ?? ??????? ??? ????? ?? ????? ???

??? ????: ????? ???? ???? ????? ?? ????? ??? ?? ??? ??? ??? ????? ?? ???? ??? ?? ??? ??? ??? ??? ?? ??? ??? ??? ?? ?????? ?? ?? ??? ???? ?? ????? ???? ??????

2. ??? ??????? ??? ??? ??? ??????? ??? ??? ?? ??????? ???? ??? ??? ??????? ??????? ?? ??? ???? ?????? ????? ????? ??? ??? ????? ???? ???? ??? ??? ??? ?? ??? ???? ??? ??????? ????????????? ??? ??? ??? ??????? ??? ????? ?? ???? ??.

????????????? ?? ????? ???? ???? ?? ??? ??? ??? ??? ???? ???? ???? ?? ????? ??? ??????? ??????? ??? ???? ???

The hot-dip zinc coating is thicker and can produce an iron zinc alloy layer, which has stronger corrosion resistance than electrogalvanizing.

3. ??? ????????: ?? ?? ?? ????? ????????? ??? ????????? ????? ?? ??? ?? ?????? ???? ??.

???????? ??? ???????? ????? ?? ??? ?????? ???? ????? ??? ??? ??????? ?? ???? ??? ?? ?????? ??? ????? ?? ????? ???? ??. ?? ?? ???? ??? ????? ????? ??? ?????? ?? ??? ?? ??? ???? ?? ?? ??? ??? ??? ?? ??? ?????? ?????? ???? ??? ??? ???????? ????? ??? ???? ????? ?? ????? ???.

4. ??? ??? ?????: ??? ????? ????? ?? ???? ??? ???? ???? ?? ?????? ???? ????? ???? ?? ???? ??? ???? ???? ??? ?? ????. ???? ?? ????? ???? ??? ???? ???? ??? ???? ???? ????? ?? ????? ?? ????? ??? ???? ?? ??? ?? ??????? ???? ???? ???. ??????? ?? ????? ???? ??? ?? ??? ?? ?????? ???? ?? ??? ?? ?? ???? ?????? ?? ?? ?? ????? ???? ??? ????? ?? ??? ????? ?? ????? ????????? ???? ?? ??? ????? ???? ??.

5. ????? ????? ???? ?? ??? ?? ????? ????????? ?? ????? ?? ????? ??. ??????? ?? ????? ????? ???: ??? ????? ????? ??? ???? ????? ????? ????? ?????. ??? ????? ????? ????? ???? ??? ??? ?? ??????? ??? ???? ??? ??

??? ????? ????? ?? ????? ?? ??? ???? ???.

??? ??? ???? ?? ???? ????? ???????:

GBT13914-2002

GBT13915-2002

GB-T15005-2007 Stamped parts - Limiting deviations without specified tolerances

GB- T 13916- 2002 Stamped parts - Shape and position without specified tolerances

????? ??? ?? ??????? ??? ???? ?? ??? ???? ?????????? ????? ??? ????? ??? ???? ????? ?? ?????????? ?? ???