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Production Process Guidance of Leaf Springs-Cutting and Straightening(Part 1)

Views: 0     Author: Wondee Autoparts     Publish Time: 2022-03-10      Origin: Wondee Autoparts

Production Process Guidance of Leaf Springs

-Cutting and StraighteningPart 1


1. Definition:

1.1. Cutting

Cutting: cut spring steel flat bars into the required length according to the process requirements.


1.2.Straightening

Straightening: adjust the side bending and flat bending of the cut flat bar to ensure that the curvature of the side and plane meets the production requirements.


2. Application:


All spring leaves.


3. Operating procedures:

3.1. Raw material inspection

As shown in Figure 1 below, check the specification, steel grate, heat number, manufacturer and warehousing inspection qualification mark of spring steel flat bar before cutting. All items meet the requirements of leaf spring process, and then transfer to the next process to start cutting.

Spring steel flat bars

(Figure 1. Spring steel flat bars)

3.2. Cutting operation

First piece flat bar shall be cut off for the first inspection. Only it passing the first inspection, it can be submitted to the inspector for review before batch cutting. During batch cutting, it is necessary to prevent the loosening of fixtures from exceeding the tolerance, resulting in repair or scrap.



3.3. Material Management

As shown in Figure 2 below, the cut spring steel flat bar sheets shall be stacked neatly. It is forbidden to place them at will, resulting in surface bruises. The inspection qualification mark shall be made and the work transfer card shall be pasted.

Semi-finished leaf bars stack

(Figure 2. Semi-finished leaf bars stack)

4. Detection Schematic diagram:


After the cutting process, the flat bars need to be detected, mainly including:

1) Verticality detection of cutting section


As shown in figure 1 below.

Schematic diagram of cutting section verticality measurement

(Fig. 1. Schematic diagram of cutting section verticality measurement)


2) Detection of burr height of cutting section


As shown in figure 2 below.


Schematic diagram of cutting section burr measurement

(Fig. 2. Schematic diagram of cutting section burr measurement)


3) Side bending and flat bending detection of cut flat bars


As shown in figure 3 below.


Schematic diagram of side bending and flat bending measurement of a cut bar

(Figure 3. Schematic diagram of side bending and flat bending measurement of a cut bar)


5. Inspection standards:

The inspection standards of spring leaf straightening process as shown in Table 1 below.


Items

Side Bending

Flat Bending

Straightening Indentation

Technical Requirements

Side bending of 1 ~ 3 pieces (main leaf): δ ≤1mm/m


1 ~ 3 pieces (main leaf) within 300mm length at both ends bending:


δ ≤0.3mm/m


Side bending of other leaves: δ ≤1.2mm/m


1 ~ 2 pieces of parabolic leaf spring (main leaf) within any 800mm   length: δ≤ 5mm


Arc surface within any 50mm length of each piece:

δ≤0.5mm

Flat bend of the   remaining piecesδ≤5mm/m

 


The straightening indentation is smooth and passes the acceptance   standard: δ ≤5mm/m


Transition shape, indentation depth ≤ 0.5mm, transverse indentation is not   allowed


Measuring and inspection tools

Name

Feeler Gauge

Feeler Gauge

Visual inspection

Accuracy

0.05mm

0.05mm

Inspection sampling method

Each batch shall be inspected according to the first, middle and last inspection, and the visual inspection rate of punching surface quality is 100%

Compiled by  WONDEE Autoparts

2022-3-10


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