How to Measure A Leaf Spring?
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1. Main parameters of leaf springs
As shown in Figure 1 below. The main parameters of leaf springs are:
2. Main processing technology of leaf spring ends
As shown in Figure 2 below. The end processing technologies of leaf springs mainly includes the following categories:
3.?Tools for measuring leaf springs
As shown in Figure 3 below. The following tools are mainly used in the measurement of leaf springs: a vernier caliper, a tape measure, a square ruler, a cord, a thread gauge (not commonly used), a fillet R gauge (not commonly used), a pen and papers for recording data, etc.
4. Measurement of leaf spring assembly
1) Photographing and archiving
Record the identification contents and paint colors of leaf springs.
2) Measure and record the arc height (H), arc length (L) and half arc length of the leaf spring assembly
As shown in Figure 4 below. 2-3 people are required to measure with a cord and a tape measure.
3) Measure and record the parameters of the center bolt
As shown in Figure 5 below. Use a vernier caliper and a thread gauge to measure the bolt sizes (bolt head diameter and height, bolt length, etc.) and record the data. At the same time, record the position of the bolt head (on the concave or convex surface of leaf spring assembly).
4) Measure and record the clamps, clamp bolts
As shown in Figure 6 below. Measure with a vernier caliper. Record the serial number of the leaf spring sheet where the clamp is located, clamp positioning dimension (L), clamp quantity, material thickness (h) and width (b) of each clamp, clamp bolt hole distance (H), clamp bolt dimension, etc.
5) Measure and record each leaf
See article 5 for details.
Note: the disassembled leaves shall be placed according to the original leaf spring assembly direction, and the placement direction shall not be changed at will.
5. Measure the single leaf
Before measurement of the single leaf, take photos and keep files, record the product color and material specification (width and thickness), and then measure the dimensional data.
1) Measurement of end trimming and corner cutting
As shown in Figure 7 below. Measure sizes b and l with a vernier caliper. Record the relevant dimensional data (b) and (l).
2) Measurement of end bending and compression bending
As shown in Figure 8 below. Measure with a vernier caliper and a tape measure. Record dimensional data (H, L1 or L, l and h.)
3)?Measurement of short taper
As shown in Figure 9 below. Measure with a vernier caliper and a tape measure. Record dimensional data (h) and (l).
As shown in Figure 10 below. If the short tapered leaf spring with a rib groove, use a vernier caliper and a tape measure for measurement. Record relevant dimensional data.
4) Measurement of rolled eyes
As shown in Figure 11 below. Measure with a vernier caliper and a tape measure. Record relevant dimensions. When measuring the inner diameter of the eye, pay attention to the possibility that there may be horn holes and elliptical holes in the eye. It shall be measured 3-5 times, and the average value of the minimum diameters shall prevail.
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If the rolled eye contains bushing, use a vernier caliper to measure and record the relevant sizes and material of bushing. Common bushings are as follows:
① Bi-metal bushings and copper bushings
Use a vernier caliper to measure the 3bushing sizes are shown in Figure 12 below:
② Rubber composite bushings
Use a vernier caliper to measure the related sizes of rubber composite bushing is shown in Figure 13 below:
③ Rubber composite flanging bushing
Use a vernier caliper to measure the related sizes of a rubber composite flanging bushing, as shown in Figure 14 below:
5)?Measurement of wrapped eyes of a leaf
As shown in Figure 15 below. Use a cord, a tape measure and a vernier caliper to measure and record relevant data.
After measuring L2,L1 can be calculated by the formula L1 ≈ L2 - (H1 / 2 + 4). If the length sizes of the matching ear leaf is known, the leaf spring engineer can calculated the sizes L1 and L2 accordingly.If there are corner cutting and edge cutting processes, and the dimensions of corner cutting and edge cutting are measured in addition.
6) Measurement of long taper
There are three main types of long tapered leaf springs: ordinary trapezoidal structure, abrupt trapezoidal structure and parabolic structure. Use a tape measure and a vernier caliper to measure and record relevant data. The measurement method is as follows:
①?Ordinary trapezoidal structure
As shown in Figure 16 below. Measure and record the data with a vernier caliper and a tape measure.
②?Abrupt trapezoidal structure
As shown in Figure 17 below. Measure and record the data with a vernier caliper and a tape measure.
③?Parabolic structure
As shown in Figure 18 below. Measure and record the data with a vernier caliper and a tape measure.
The measurement record table of a parabolic structure leaf spring is shown in below table.
7)?Measurement of milling edge and?a flat-straight segment
As shown in Figure 19 below. Use a vernier caliper and a tape measure to measure and record relevant data.
8) Measuring camber Hof a leaf spring with a flat-straight segment in the middle and unequal arc length on the left and right sides of the center hole
As shown in Figure 20 below. Use a cord, a tape measure and a square to measure and record relevant data(H, Hl and Hr).
9)?Measurement of?concave convex center hole
As shown in Figure 21 below. Use a vernier caliper to measure and record relevant data.
10) Measurement of?oval center hole
As shown in Figure 22 below. Use a vernier caliper to measure and record relevant data.
Compiled by ?WONDEE Autoparts