Requirements: Correctly use an adjustable reamer to complete the work of the connecting rod bushing, check the quality and meet the requirements.

1 Select reamer

First, measure the outer diameter dimension of the piston pin with the outer diameter percentile rule, and select the appropriate reamer for the agricultural machine bushing according to the outer diameter size of the car bushing piston pin to reel the connecting rod bushing.

2 Installation and adjustment of reamer

The reamer is clamped on the bench vise. The reamer should be self-lubricating sliding bearing perpendicular to the jaws. According to the calculation of the gap between the piston pin and the connecting hole of the connecting rod, adjust the appropriate reamer amount of the reamer and put the small end of the connecting rod on the reamer, so that the edge of the connecting rod is exposed at a certain distance from the upper plane of the bush. All were reaped.

3 Shaving operation

Hold the connecting rod flat and use even force. The beginning of the knife should not be too large, otherwise it will easily lead to twisting, uneven knife and so on. The direction of rotation is clockwise. Reverse reaping is not allowed. Each skein is twisted with a constant diameter. It is appropriate to adjust the feeding amount each time, and the feed amount should be one-sixth to one-quarter. It is necessary to use the piston pin test and the connecting rod bushing in boring in order to prevent excessive twisting.

4 Cutting quality inspection

After the bushing, the surface roughness of the bushing hole is less than Ra0.8μm, and the inner caliper and the percent ruler are used to measure the roundness and cylindricity of the bushing, which should be no more than 0.05mm. The fitting gap between the bushing and the piston pin is 0.010 to For 0.046 mm, the piston pin can be pre-inserted into the bushing by about 20 mm. Using the thumb to push the piston pin, it is possible to advance slowly but do not use force.