CN111299634A

CN111299634A - Processing technology of reverse reamed surface of main reducer shell

Info

Publication number: CN111299634A
Application number: CN201911353783.0A
Authority: CN
Inventors: 尹树岭; 闫文利; 杨华; 王朝飞; 孙莉; 孙艳龙
Original assignee: Beiben Trucks Group Co Ltd
Current assignee: Beiben Trucks Group Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-06-19

Abstract

The invention relates to a processing technology of a reverse countersink of a main reducer shell. The processing technology comprises the specific steps that one end of a drill rod is fixed in a main shaft jacket of a rocker drill; stably placing the main reducer casing to be processed on a workbench and clamping; when a main shaft of the rocker drill is in a stop state, manually operating the rocker drill to enable the other end of the drill rod to penetrate into a bolt hole in the main reducer casing from the front side of the processed main reducer casing, wherein the end part of the other end of the drill rod is a chamfered edge cylinder, aligning a long hole of a tool bit with the chamfered edge cylinder part of the drill rod and then loading the tool bit, and then fixedly installing the tool bit on the other end of the drill rod; and moving the main shaft of the rocker drill upwards to enable the tool bit to lightly contact with the part, starting the rocker drill, reversely rotating the main shaft to realize the machining of the bolt hole end face by the reverse countersink tool bit, and stopping the main shaft after the machining is finished to take out the tool bit in a reverse rotation mode. The invention realizes the machining of the counter-sunk surface on the rocker drill.

Description

Processing technology of reverse reamed surface of main reducer shell

Technical Field

The invention belongs to the manufacturing technology of main reducer shells of trucks, and particularly relates to a processing technology of a counter-faced surface of a main reducer shell.

Background

The current medium and heavy truck owner subtracts the shell, and accessible can directly carry out the ream face processing with axle housing connection position bolt hole reverse side. The reverse side facing processing is not needed.

The single-reduction main reduction shell realizes light weight. The main reducer housing is cast integrally with the conventional through drive pinion housing. Resulting in the presence of a housing self-obstruction opposite the axle housing attachment bolt holes. Can not be directly processed, and moreover, the bolt hole is only phi 14.5 mm. The connecting structure is reliably connected with the axle housing. The reverse side needs to be machined into a spot facing with the diameter of 30 mm. And (5) carrying out bolt compression. Now, the diameter of the counter-sunk surface is large. The reverse interpolation milling can not be carried out by the existing three-edge milling cutter.

Disclosure of Invention

The invention aims to provide a machining process of a reverse countersink of a main reducer shell, which realizes machining of the reverse countersink on a rocker drill.

The technical scheme of the invention is that the processing technology of the reverse side spot facing of the main reducer shell comprises the specific steps that one end of a drill rod is fixed in a main shaft jacket of a rocker drill; stably placing the main reducer casing to be processed on a workbench and clamping; when a main shaft of the rocker drill is in a stop state, manually operating the rocker drill to enable the other end of the drill rod to penetrate into a bolt hole in the main reducer casing from the front side of the processed main reducer casing, wherein the end part of the other end of the drill rod is a chamfered edge cylinder, aligning a long hole of a tool bit with the chamfered edge cylinder part of the drill rod and then loading the tool bit, and then fixedly installing the tool bit on the other end of the drill rod; and moving the main shaft of the rocker drill upwards to enable the tool bit to lightly contact with the part, starting the rocker drill, reversely rotating the main shaft to realize the machining of the bolt hole end face by the reverse countersink tool bit, and stopping the main shaft after the machining is finished to take out the tool bit in a reverse rotation mode.

The invention has the advantages that the drill rod and the cutter head are in a split structure, the technical problem that the machining cannot be realized due to the fact that the main reducer shell is interfered by the shell is solved, the technical problem that the three-edge milling cutter cannot perform circular interpolation machining is solved, the universal equipment rocker drill is adopted for machining, and the drill rod and the cutter head are simple and convenient to operate and low in production cost.

Drawings

FIG. 1 is a schematic structural view of a main reduction shell requiring reverse countersinking for machining by using the machining process of the invention;

FIG. 2 is a drill rod part diagram in the machining process of the reverse countersink of the main reducing shell;

FIG. 3 is a view of a countersink of the present invention;

FIG. 4 is a schematic view of an assembly structure of a drill rod, a countersink and a machined part in the invention.

Detailed Description

The technical scheme of the invention is further described in detail in the following with the accompanying drawings of the specification.

The drill rod and the reverse countersink head are of a split structure, the tail of the drill rod is directly connected with a drill clamping sleeve of the rocker arm, and the clamping is convenient and reliable. The one end tip of drilling rod is the edging cylinder, and there is 0.1 ~ 0.3mm clearance in the one end periphery of drilling rod and the part bolt hole inner periphery of being processed, and the bolt hole on the part of being processed is passed in the installation to the one end of drilling rod, makes things convenient for the clamping and can realize the location. The center hole of the tool bit is a long hole, the positioning clearance of the tool bit and the matched part of the drill rod is 0.1-0.2 mm, and positioning and replacement are convenient.

The method comprises the following steps that one end of a drill rod is fixed in a main shaft jacket of a rocker drill; and stably placing the main reducer casing to be processed on a workbench and clamping. When a main shaft of the rocker drill is in a stop state, manually operating the rocker drill to enable the other end of the drill rod to penetrate into a bolt hole in the main reducer casing from the front side of the processed main reducer casing, aligning a long hole of a tool bit with a cylindrical part of a chamfered edge of the drill rod and then loading the tool bit, rotating the tool bit clockwise for about 15 degrees after loading, moving the tool bit to the lowest side by hand to be attached to the bottom surface of the chamfered edge of the drill rod after ensuring that the tool bit and the drill rod are clamped, and then fixedly installing the tool bit of reverse spot facing on the other end of the drill rod; and moving the main shaft of the rocker drill upwards to enable the tool bit to lightly contact the part, starting the rocker drill, rotating the main shaft reversely, and machining the tool bit upwards to the depth required by the drawing. Therefore, the machining of the end face of the bolt hole by the reverse countersink tool bit is realized, and the machining of a reverse countersink plane with shell obstruction in the main reducer shell is realized. And after the machining is finished, stopping the main shaft. And rotating the cutter head in the reverse direction and taking out the cutter head. And lifting the drill rod or moving the drill rod to the next hole position for continuous processing.

Example (b):

fig. 1 shows that the phi 30 reverse countersink part cannot be directly machined on the front surface. If the three-edge cutter is designed to pass through the hole and then carry out interpolation machining, the cutter needs to pass through the hole with the diameter phi of 14.5 mm. Processing a countersink with the diameter phi of 30 mm. Due to space limitation, the cutter can not machine the spot-facing with the diameter of phi 30mm through the aperture of phi 14.5 mm. In order to solve the problems, the drill rod and the cutter head are structurally disassembled. The reverse countersinking surface is used for finishing the interference condition of the shell of the main reducing shell. And can meet the requirements of size and position.

Claims

1. A processing technology of a reverse reamed surface of a main reducer shell is characterized by comprising the following steps: the processing technology comprises the specific steps that one end of a drill rod is fixed in a main shaft jacket of a rocker drill; stably placing the main reducer casing to be processed on a workbench and clamping; when a main shaft of the rocker drill is in a stop state, manually operating the rocker drill to enable the other end of the drill rod to penetrate into a bolt hole in the main reducer casing from the front side of the processed main reducer casing, wherein the end part of the other end of the drill rod is a chamfered edge cylinder, aligning a long hole of a tool bit with the chamfered edge cylinder part of the drill rod and then loading the tool bit, and then fixedly installing the tool bit on the other end of the drill rod; and moving the main shaft of the rocker drill upwards to enable the tool bit to lightly contact with the part, starting the rocker drill, reversely rotating the main shaft to realize the machining of the bolt hole end face by the reverse countersink tool bit, and stopping the main shaft after the machining is finished to take out the tool bit in a reverse rotation mode.