CN-121972709-A - Efficient machining method for side wall of crankshaft hole of diesel engine body

CN121972709ACN 121972709 ACN121972709 ACN 121972709ACN-121972709-A

Abstract

The invention discloses a high-efficiency machining method for a side wall of a crank hole of a diesel engine body, which belongs to the technical field of machining and comprises the following steps of S4, adopting milling cutter row cutterheads as machining cutters, wherein the diameter D5 of each cutterhead of the milling cutter row cutterhead is equal to the diameter D6 of a machining surface of the side wall of the diesel engine body, the width D7 of each cutterhead after two sides of each cutterhead are flattened is slightly smaller than the opening width D1 of a combining surface of an oil pan of the diesel engine body, S5, driving the milling cutter row cutterhead to move to a position 5-10 mm above the left side wall of the diesel engine body along the Z direction, then moving downwards to the center of the crank hole, and controlling the milling cutter row cutterhead to feed and scrape the left side wall residual part along the Z direction until the side cutting machining is completed. The invention can realize the processing of the side wall when the opening width of the joint surface of the engine body oil pan is smaller than the processing diameter of the side wall, has higher economy and greatly improves the processing efficiency.

Inventors

LI WENBIN
FENG XIN
HAO JING
GU XIANGYANG
LI RUIJIE
LI WENFENG
LV BAOXIN

Assignees

河南柴油机重工有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260204

Claims (5)

1. The efficient machining method for the side wall of the crankshaft hole of the diesel engine body is characterized by comprising the following steps of: s1, in an initial state, a combination surface of an oil pan of a diesel engine body (1) is placed and fixed upwards, a three-face edge milling cutter row is adopted as a processing cutter, and the diameter D2 of each three-face edge milling cutter (2) of the surface edge milling cutter row is slightly smaller than the gear opening width D1 of the combination surface of the oil pan of the diesel engine body; S2, driving the three-edge milling cutter row to move to 1 back cutting thickness T1 above the left side wall of the machine body along the Z direction and stopping the milling cutter row, controlling the rotation of the three-edge milling cutter row and simultaneously feeding the three-edge milling cutter row downwards to the center of a crank shaft hole (11) to realize the first milling process of the multi-gear left side wall; S3, repeating the step S2 until the side cutting machining is completed, then driving the three-edge milling cutter row to lift in the Y direction and leave the machine body, controlling the three-edge milling cutter row to move to the right side, and repeating the step S2 to cut the side wall on the right side of the machine body until the machining is completed; S4, replacing a cutter, wherein a cutter row cutter head (3) is used as a machining cutter, the diameter D5 of each cutter head of the cutter row cutter head (3) is equal to the diameter D6 of a machining surface of a side wall of a machine body, and the width D7 of each cutter head after being flattened at two sides of the cutter head is slightly smaller than the opening width D1 of a joint surface of an oil pan of the machine body, so that the cutter head can enter the center of a crank shaft hole (11) in an oriented manner and does not interfere with the joint surface of the oil pan of the machine body when rotating; S5, driving the milling cutter row cutter head (3) to move to a position above a side wall 5 mm-10 mm on one side of the machine body along the Z direction, and then moving downwards to the center of a crank shaft hole along the Y direction; S6, driving the milling cutter row disc (3) to lift upwards to leave the machine body, repeating the step S5, and cutting the side wall of the other side of the machine body until the machining is completed.
2. The efficient machining method for the side wall of the crank hole of the diesel engine body according to claim 1, wherein the diameter D3 of the cutter handle of the three-side milling cutter in the step S1 is slightly smaller than the diameter D4 of the crank hole (11) of the diesel engine body, and the diameter D8 of the cutter handle of the cutter row disc 3 in the step S4 is slightly smaller than the diameter D4 of the crank hole (11) of the diesel engine body.
3. The method for efficiently machining a side wall of a crank hole of a diesel engine body according to claim 1, wherein 1 back draft thickness T1 in the step S2 is 2 mm-4 mm.
4. The method for efficiently machining a side wall of a crank hole of a diesel engine body according to claim 3, wherein the feeding thickness T2 is 0.5 mm-1 mm when the step S2 is repeated for the last time in the step S3.
5. The method for efficiently machining the side wall of the crank hole of the diesel engine body according to claim 2, wherein D1-D2=5 mm-10 mm, D4-D3=10 mm-20 mm, D1-D7=5 mm-20 mm and D4-D8=5 mm-15 mm.

Description

Efficient machining method for side wall of crankshaft hole of diesel engine body Technical Field The invention belongs to the technical field of machining, and particularly relates to a high-efficiency machining method for a side wall of a crank hole of a diesel engine body. Background The crankshaft of the diesel engine is arranged in the crankshaft hole of the engine body, and the crankshaft hole is distributed in multiple steps along the longitudinal direction of the engine body. Because the inner cavity of the engine body is compact in structure, the side walls at the two ends of each gear of crank hole bearing seat of the engine body are required to be machined so as to prevent the interference with the engine body when the crank shaft of the diesel engine rotates, the machining allowance from the blank to finish the finish machining of the side walls is generally 3 mm-7 mm, the machining allowance is large and uneven, and the machining efficiency is low. The opening width of the joint surface of the oil pan of a certain diesel engine body is 240mm, the machining diameter of the side wall is required to be 280mm, namely, the opening width is smaller than the diameter of the surface to be machined, and a cutter is difficult to enter the engine body, so that machining is difficult. The machining method in the prior art comprises the step of utilizing a gantry machining center to be matched with a three-edge milling cutter on a flat right-angle head to finish machining of the side wall of the machine body bearing seat one by one. The diameter of the face milling cutter is equal to the machining diameter of the side wall, or the diameter of the face milling cutter is smaller than the machining diameter of the side wall, and interpolation is needed to achieve the required diameter during machining, but specific requirements are met on the width and the thickness of the right-angle head. When the milling machine is used for processing, the combination surface of the oil pan of the machine body is placed upwards, and after the three-edge milling cutter on the flat right-angle head moves to the upper side of the side wall of the machine body along the Z direction, the three-edge milling cutter rotates and simultaneously feeds downwards, so that the milling of the side wall is realized. Because of the large machining allowance of each side wall, multiple passes are usually required to finish milling of one side wall. The method is that the flat right-angle head and the three-edge milling cutter enter into a starting gear to process the side walls of the bearing seat one by one, so that the processing of a machine body with any length can be satisfied. The machine body oil pan combination surface gear opening width is only suitable for the situation that the machine body oil pan combination surface gear opening width is larger than the machining diameter of the side wall, and a right angle head and a three-edge milling cutter which are suitable for matching are required according to the machine body structure, so that the machine is low in efficiency and high in cost. Disclosure of Invention In order to overcome the defects in the background art, the invention provides a high-efficiency machining method for the side wall of a crankshaft hole of a diesel engine body, and aims to improve the machining efficiency and reduce the machining cost while realizing cutting machining by utilizing simple machining equipment and adopting a method of fractional machining aiming at the situation that the diameter of the machining surface of the side wall of a bearing seat in the diesel engine is larger than the gear opening width of an oil pan. In order to achieve the purpose, the invention provides the following technical scheme that the efficient processing method for the side wall of the crankshaft hole of the diesel engine body comprises the following steps. S1, in an initial state, the combination surface of the oil pan of the diesel engine body is placed and fixed upwards, a three-face cutter row is adopted as a processing cutter, the diameter D2 of each three-face cutter of the three-face cutter row is slightly smaller than the gear opening width D1 of the combination surface of the oil pan of the diesel engine body, and a left three-face cutter and a right three-face cutter are respectively arranged corresponding to each gear of a crankshaft hole of the diesel engine body. S2, driving the three-edge milling cutter row to move to the thickness T1 of the back cutting depth above the left side wall of the machine body along the Z direction, and stopping, and controlling the three-edge milling cutter row to rotate and simultaneously feed downwards to the center of a crank hole so as to realize the first milling process of the multi-gear left side wall. And S3, repeating the step S2 until the side cutting is finished, then driving the three-edge milling cutter row to lift in the Y direction and leave the machine body, cont