1 manufacturing technical requirements

1. The products shall be manufactured according to the drawings and techniques approved by the prescribed procedures.

2. The materials used in the product shall conform to the requirements of the drawings. The materials shall conform to the national standards and have a warranty.

3, the spring stiffness limit deviation should be + 10%.

4, in the free state, the axis of the spring on the two end of the vertical does not exceed 2.5% of the free height.

5, the spring free high limit deviation is 2% + of the free height.

6, the need for heat treatment parts, the hardness value should comply with the provisions of the drawings.

7, the product should be in accordance with the requirements of the displacement direction locked factory.

8 welding and welding shall comply with the drawings and technical documents.

9, the weld surface shall not have cracks, slag, pores, craters and more than 0.5mm deep undercut.

2 Inspection and test technical requirements

1. All parts which are heat treated shall be tested by hardness.

2. The products shall be inspected for their size and connection size before leaving the factory. The following performance tests shall be carried out one by one:

(a) load deviation degree lambda

Lambda =|Wb-Wa) /Wb| * 100%...... (3)

And lambda = 5%

Type: Wb - standard load, N;

Measured load at Wa - pull pin, N.

B) constant Delta

Delta n (Wmax-Wmin) / (Wmax+Wmim)] x 100%

And in less than 6%.

Formula: the maximum load value of Wmax - rotation process, N;

Minimum load value of Wmin - rotation process, N.

C) overload test

The fixed pin shaft is placed at the initial position of the factory, and the support hanger is loaded slowly. The load value is 2 times the standard load value of the hanger, and the bracket is observed

In part, there must be no exception.