Processing technology of cylinder bearing hole on boring machine

Abstract

The boring machine processes the cylinder bearing hole processing technology. The exhaust side of the cylinder body is used as a reference surface downward. The cylinder liner hole is processed first. After the cylinder liner hole is processed, the boring bar is extended to process the stuffing box hole on the bottom of the cylinder body to form a pre-stuffing box hole. The workpiece is rotated 180 degrees, and the exhaust side is continued to be used as a reference surface downward. The center position of the cylinder liner hole of the first and last cylinder body is measured by the spindle clamping the dial indicator and rotating slowly. Check whether the centers of the two cylinder liner holes are on the same horizontal line. If the center coordinates of the cylinder liner hole conflict with the exhaust side, the cylinder body should be aligned based on the center coordinates of the cylinder liner hole. After finding the straight line, the pre-stuffing box hole is aligned vertically with the cylinder liner hole until the coaxiality of the cylinder liner hole and the pre-stuffing box hole meets the requirements of the drawing, and then the finished stuffing box hole is processed. This method of the present invention solves the problems of zero point setting and shape and position tolerance control at this position.

Description

Technical Field

[0001] The invention relates to the field of large-scale low-speed marine diesel engine cylinder bodies, and in particular to a processing technology for processing cylinder sleeve holes and stuffing box holes by using a boring machine. Background Art

[0002] The cylinder block of a large low-speed marine diesel engine has high coaxiality requirements for the cylinder liner hole and stuffing box hole of the cylinder block. This can be completed by one-time clamping during gantry milling, but the processing is completed by rotating the workpiece direction on a boring machine. Therefore, the alignment and zero point setting of the cylinder liner hole and stuffing box hole are the difficulties in cylinder block boring machine processing. Once an error occurs, the impact is huge. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a boring machine processing cylinder bearing hole processing technology, the technical solution adopted is:

[0004] The boring machine processes the cylinder bearing hole processing technology. The exhaust side of the cylinder block is used as the reference surface downward. The cylinder liner hole is processed first. After the cylinder liner hole is processed, the boring bar is extended to process the stuffing box hole on the bottom of the cylinder block to form a pre-stuffing box hole. The workpiece is rotated 180 degrees, and the exhaust side continues to be used as the reference surface downward. The center position of the cylinder liner hole of the first and last cylinder blocks is measured by slowly rotating the spindle with a dial indicator. Check whether the centers of the two cylinder liner holes are on the same horizontal line. If the center coordinates of the cylinder liner hole conflict with the exhaust side, the cylinder block must be aligned based on the center coordinates of the cylinder liner hole. After the straight line is found, the pre-stuffing box hole is vertically aligned with the cylinder liner hole until the coaxiality of the cylinder liner hole and the pre-stuffing box hole meets the requirements of the drawing. Then the stuffing box hole is processed as a finished product.

[0005] In the above-mentioned boring machine processing process for machining the cylinder bearing hole, further, the length of the pre-stuffing box hole is 5-10 mm, and the diameter of the pre-stuffing box hole is 1 mm smaller than the diameter of the stuffing box hole of the final product.

[0006] The method of the present invention solves the problem of zero point setting and shape and position tolerance control at the position. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the structure of the cylinder liner hole and stuffing box hole with the exhaust side of the cylinder body downward as the reference surface;

[0008] Figure 2 yes Figure 1 A side view structural schematic diagram of;

[0009] Figure 3 It is a schematic diagram of the structure after the cylinder body is rotated 180 degrees;

[0010] Among them: 1-exhaust side, 2-stuffing box hole, 3-cylinder liner hole. DETAILED DESCRIPTION

[0011] The present invention will be further described with reference to the accompanying drawings. Figure 1 , 2 The boring machine shown in the figure processes the cylinder bearing hole, with the cylinder exhaust side 1 downward as the reference surface, and first processes the cylinder liner hole 3. After the cylinder liner hole is processed, the boring bar is extended to process the stuffing box hole 2 on the bottom surface of the cylinder to form a pre-stuffing box hole. The length of the pre-stuffing box hole is 5-10mm, and the diameter of the pre-stuffing box hole is 1mm smaller than the diameter of the stuffing box hole of the final product.

[0012] like Figure 3 As shown, the workpiece is rotated 180 degrees, and the exhaust side surface is continued to be used as the reference plane. The center position of the cylinder liner holes of the first and last cylinder blocks is measured by slowly rotating the spindle with a dial indicator, and the centers of the two cylinder liner holes are checked to see if they are on the same horizontal line. If the center coordinates of the cylinder liner holes conflict with the exhaust side surface, the cylinder block shall be aligned based on the center coordinates of the cylinder liner holes. After the straight line is found, the pre-stuffing box hole shall be vertically aligned with the cylinder liner hole, and the coaxiality of the cylinder liner hole and the pre-stuffing box hole shall be detected to meet the requirements of the drawing. Then the finished stuffing box hole can be processed.

Claims

1. The process of machining cylinder bearing holes by boring machine is characterized by: The exhaust side of the cylinder block is used as a reference surface, and the cylinder liner hole is machined first. After the cylinder liner hole is machined, the boring bar is extended to machine the stuffing box hole on the bottom of the cylinder block to form a pre-stuffing box hole; the workpiece is rotated 180 degrees, and the exhaust side continues to be used as a reference surface downward. The center positions of the cylinder liner holes of the first and last cylinder blocks are measured by slowly rotating the spindle with a dial indicator, and it is checked whether the centers of the two cylinder liner holes are on the same horizontal line. If the center coordinates of the cylinder liner hole conflict with the exhaust side, the cylinder block must be aligned based on the center coordinates of the cylinder liner hole. After the straight line is found, the pre-stuffing box hole is vertically aligned with the cylinder liner hole until the coaxiality of the cylinder liner hole and the pre-stuffing box hole meets the requirements of the drawing. Then the finished stuffing box hole can be machined.

2. The process for machining cylinder bearing holes by boring machine according to claim 1, characterized in that: The length of the pre-stuffing box hole is 5-10 mm, and the diameter of the pre-stuffing box hole is 1 mm smaller than the diameter of the stuffing box hole of the final product.

Images