CN109014268B

CN109014268B - Method for machining bolt hole of mounting seat of frame gear box

Info

Publication number: CN109014268B
Application number: CN201810999225.0A
Authority: CN
Inventors: 熊超欧; 王雪芳; 熊骞; 董欣
Original assignee: CRRC Zhuzhou Locomotive Co Ltd
Current assignee: CRRC Zhuzhou Locomotive Co Ltd
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2020-07-31
Anticipated expiration: 2038-08-30
Also published as: CN109014268A

Abstract

The invention discloses a method for processing a bolt hole of a mounting seat of a frame gear box, which comprises the following steps: 1) installing a first drill bit on a cutter handle, machining a first bolt hole in the first base plate, wherein the length of the first drill bit and the cutter handle which are installed together is smaller than the distance between the first base plate and the second base plate, and the outer diameter of the cutter handle is smaller than or equal to the aperture of the first bolt hole; 2) disassembling the first drill bit; 3) placing a second drill bit between the first seat plate and the second seat plate, and enabling the second drill bit to penetrate through the first bolt hole and then be installed on the cutter handle; 4) and processing a second bolt hole on the second seat plate by using a second drill bit, and detaching the second drill bit after drilling. The method of the invention can process the bolt holes of the two seat plates without adding special equipment and working procedures, solves the problem that the bolt holes of the two seat plates can not be processed simultaneously by the existing standard twist drill, and reliably ensures the production rhythm of the production line.

Description

Method for machining bolt hole of mounting seat of frame gear box

Technical Field

The invention belongs to the technical field of bogie frame accessory processing, and particularly relates to a method for processing a bolt hole of a frame gearbox mounting seat.

Background

The framework of some existing bogies is designed with two gear box mounting seats, each of which is formed by welding two seat plates. The thickness of bedplate thickness is 20mm, distance 130mm between two bedplate, and wherein there is a bedplate and motor to hang the Y direction distance 218mm of seat at the mount pad both ends, and another bedplate is 434mm with the Y direction distance of curb girder, and is 218.3mm with stopper mount pad Z direction distance. The diameter of the pin hole is measured to be phi 30 (+ 0.2, + 0.4) mm. Wherein the Y direction is the lateral direction of the frame and the Z direction is the vertical direction of the frame.

At present, in the domestic machining industry, a tool capable of drilling only has two structural forms, namely a twist drill and a keyway milling cutter.

(1) The national standard stipulates that the diameter of the cylindrical keyway milling cutter with the specification size of phi 28mm is 32mm, and the cylindrical keyway milling cutter with the specification size of phi 30mm is not provided. Only a cylindrical keyway milling cutter with the diameter phi of 28mm can be used for milling a hole with the diameter phi of 30mm, at present, the thickness of the smallest special accessory head of the general numerical control plano boring and milling machine is 200mm, the thickness of a pull rod hexagon head of a tool handle is 50mm, the thickness of a clamping step of a manipulator of the tool handle is 70mm, the length of the keyway milling cutter is 100mm, and the clearance between the accessory head and a workpiece and the clearance between a cutter and the workpiece are not less than 20 mm. The length dimension in the Y direction of the total processing space must be larger than 440 mm. Obviously, the hole with the diameter of 30mm cannot be machined from the dimension of 218mm in the direction of the motor hanging seat, and the machining space from the direction of 434mm of the side beam is also tense. The thickness of the hexagonal head of the pull rod of the accessory head tool handle is changed into 30mm, so that the machining space is increased. Therefore, the hole of the first block seat plate (the seat plate close to the side beam) can be processed smoothly, and when the hole of the second block seat plate (the seat plate close to the motor suspension seat) is processed, the length of the cutter with the length of 100mm cannot reach the length of 170mm from the first block seat plate to the second block seat plate. So the solution of milling a hole with a diameter phi of 30mm by using a keyway milling cutter is not feasible.

(2) According to the national standard, the twist drills with the diameter of phi 30mm can be provided on the market by 168mm of total length of straight shank short twist drill, 307mm of total length of straight shank long twist drill, 296mm of total length of Morse taper shank twist drill and 351mm of total length of Morse taper shank long twist drill. The feasibility of the machining was first analyzed only in terms of the length of the drill:

the total length of the straight shank short twist drill is 168mm, and the length of the removed clamping part is obviously not enough to be 170 mm.

The straight shank twist drill has a total length of 307mm, and the clamped total length is at least 600mm long except the clamping position, so that the distance between the side beam and the first seat plate in the Y direction is more than 434mm, and a cutter cannot process the straight shank twist drill (see figure 1).

The total length of the Morse taper shank twist drill is 296mm, the length of the clamped part after clamping is nearly 600mm, and the cutter cannot be further processed (see figure 1).

The total length of the Morse taper shank twist drill is 351mm, and the machining can not be carried out.

Disclosure of Invention

In order to solve the technical problems that the length of a cutter cannot reach the stroke from a first base plate to a second base plate or the length of the cutter is too long to carry out machining, the invention provides a method for machining a bolt hole of a mounting seat of a gearbox of a framework, and the specific technical scheme is as follows.

A method of machining a pin hole of a gearbox mounting block of a frame, the frame including a motor suspension block and a gearbox mounting block provided on a frame beam, the motor suspension block and the frame side beam being located on either side of the gearbox mounting block, respectively, the gearbox mounting block including a first seat plate and a second seat plate parallel to a longitudinal direction of the frame, the method comprising the steps of:

1) installing a first drill bit on a cutter handle, machining a first bolt hole in the first base plate, wherein the length of the first drill bit and the cutter handle which are installed together is smaller than the distance between the first base plate and the second base plate, and the outer diameter of the cutter handle is smaller than or equal to the aperture of the first bolt hole;

2) disassembling the first drill bit;

3) placing a second drill bit between the first seat plate and the second seat plate, enabling the second drill bit to penetrate through the first bolt hole and then be installed on the cutter handle, wherein the length of the second drill bit is smaller than the distance between the first seat plate and the second seat plate, and the length of the second drill bit and the cutter handle installed together is larger than the sum of the distance between the first seat plate and the second seat plate and the thicknesses of the first seat plate and the second seat plate;

4) and processing a second bolt hole on the second seat plate by using a second drill bit, and detaching the second drill bit after drilling.

As a further improvement to the above scheme: the drilling part of first drill bit, second drill bit adopts the structure of standard fluted drill, the installation part of first drill bit, second drill bit adopts threaded connection head. The drill bit adopts threaded connection head on the one hand to be convenient for install fast and dismantle, and on the other hand can guarantee that second drill bit and handle of a knife threaded connection back handle of a knife also can pass first bolt hole realizes the processing in second bolt hole.

As a further improvement to the above scheme: and a support component is arranged between the motor suspension seat and the gear box mounting seat and/or between the framework side beam and the gear box mounting seat. The supporting component can enhance the rigidity of cutting to avoid shaking of a workpiece during drilling, and the dimensional accuracy and the roughness of a machined hole are guaranteed to meet the requirements of a drawing.

As a further improvement to the above scheme: a support member is disposed between the first seat plate and the second seat plate. The support component can reduce the shaking of the first seat plate and the second seat plate during drilling.

The first seat plate may be a seat plate closer to the frame side member or a seat plate closer to the gear box mount, that is, the bolt hole may be formed from the frame side member toward the gear box mount or from the gear box mount toward the frame side member, as the conditions permit.

The present invention has the following advantageous effects.

(1) Under the original equipment and processing conditions without adding special equipment and special tool fixtures, the technical problem that when a bolt hole (anti-falling pin hole) of a mounting seat of a gearbox of a frame is processed, the drill bit is too short to travel from a first seat plate to a second seat plate or the drill bit is too long to be processed is solved by designing two drill bits with specific lengths and flexible clamping tools (in threaded connection).

(2) The drill bit adopts threaded connection's structural style makes cutting efficiency high, processingquality's assurance strong.

(3) The whole designed processing method and the drill bit have the advantages of low cost, simple operation and strong practicability.

Drawings

FIG. 1 is a schematic view showing that two seat plates cannot be machined due to too long length after a standard twist drill is clamped;

FIG. 2 is a schematic illustration of the frame construction and dimensions (top is a front view and bottom is a top view);

FIG. 3 is a schematic view of a first shoe plate machined with a first drill bit;

FIG. 4 is a schematic view of the installation of a second drill bit;

FIG. 5 is a schematic view of a second shoe plate machined with a second drill bit;

fig. 6 is a schematic diagram of the structure of the first and second drill bits.

In the figure: the drilling machine comprises a framework cross beam 1, a framework side beam 2, a motor suspension seat 3, a gear box mounting seat 4, a first seat plate 41, a second seat plate 42, a brake mounting seat 5, a bolt hole 6, a first drill 7, a second drill 8, a tool shank 9, a machine tool accessory head 10, a drilling part 11 and a mounting part 12.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Referring to fig. 2-6, the frame includes a motor suspension mount 3 and a gearbox mount 4 disposed on a frame beam 1, the motor suspension seat 3 and the framework side beam 2 are respectively positioned at two sides of the gear box mounting seat 4, the gear box mounting seat 4 comprises a first seat plate 41 and a second seat plate 42 which are parallel to the longitudinal direction (X direction) of the framework, the thickness of the first seat plate 41 and the thickness of the second seat plate 42 are both 20mm, the distance between the two seat plates is 130mm, the distance between the second seat plate 42 and the motor suspension seat 3 in the Y direction is 218mm, the distance between the first seat plate 41 and the lateral direction (Y direction) of the side beam 2 of the framework is 434mm, the distance from the brake mounting seat 5 in the vertical direction (Z direction) is 218.3mm, the bore diameter machining dimension of the pin hole 6 (anti-drop pin hole) is phi 30 (+ 0.2, + 0.4) mm, and the pin hole 6 includes a first pin hole located on the first seat plate 41 and a second pin hole located on the second seat plate 42. In order to adapt to the space limitation of processing, the thickness of a pull rod hexagon head of a small accessory head tool handle of the original 17-meter numerical control planer boring and milling machine is changed from 50mm to 30 mm.

The machining method of the bolt hole 6 comprises the following steps:

1) installing a first drill 7 on a cutter handle 9, wherein the cutter handle 9 is arranged on a machine tool accessory head 10, the length of the first drill 7 is 80mm, the length of the first drill 7, the cutter handle 9 and the machine tool accessory head 10 in the transverse direction is smaller than the distance between a first seat plate 41 and a frame side beam, machining a first bolt hole on the first seat plate 41 by using the first drill 7, the length of the first drill 7 and the cutter handle 9 which are installed together is smaller than the distance between the first seat plate 41 and a second seat plate 42, and the outer diameter of the cutter handle 9 is smaller than or equal to the aperture of the first bolt hole;

2) disassembling the first drill bit 7;

3) placing a second drill 8 between a first seat plate 41 and a second seat plate 42, enabling the second drill 8 to pass through a first bolt hole and then be installed on the cutter handle 9, wherein the length of the second drill 8 is 110mm, the length of the second drill 8 is smaller than the distance between the first seat plate 41 and the second seat plate 42, and the length of the second drill 8 and the cutter handle 9 which are installed together is larger than the sum of the distance between the first seat plate 41 and the second seat plate 42 and the thicknesses of the first seat plate 41 and the second seat plate 42;

4) and a second bolt hole is processed on the second seat plate 42 by using the second drill bit 8, and the second drill bit 8 is detached after drilling.

Preferably, referring to fig. 6, the drilling portions 11 of the first and second drills 7 and 8 are constructed as standard twist drills, and the mounting portions 12 of the first and second drills 7 and 8 are threaded. The drill bit adopts threaded connection head to connect and is convenient for quick installation and dismantlement on the one hand, and on the other hand can guarantee that second drill bit 8 and handle of a knife 9 threaded connection back handle of a knife 9 also can pass first bolt hole, realizes the processing to second bolt hole.

Preferably, a support member (not shown) is provided between the motor suspension mount 3 and the gearbox mount 4, and/or between the frame side member 2 and the gearbox mount 4; a support member may be provided between the first seat plate 41 and the second seat plate 42. The two ends of the supporting component are respectively abutted between the two components, the supporting component 13 can enhance the cutting rigidity to avoid shaking of a workpiece during drilling, and the dimensional accuracy and the roughness of a machined hole are guaranteed to meet the requirements of a drawing. The supporting component can be made of wood or steel materials.

The processing method of the application is verified by mass production, the bolt hole of the second seat plate 42 can be processed without adding special equipment and procedures on automation equipment, the production rhythm of a production line is reliably guaranteed, the processing quality of the bolt hole (anti-falling pin hole) of the mounting seat of the gear box of the framework is always stable, and the processing efficiency is high.

Claims

1. A method of machining a bolt hole of a gearbox mounting of a frame, the frame comprising a motor suspension mount (3) and a gearbox mounting (4) arranged on a frame beam (1), the motor suspension mount (3) and a frame side beam (2) being located on either side of the gearbox mounting (4), respectively, the gearbox mounting (4) comprising a first seat plate (41) and a second seat plate (42) parallel to the longitudinal direction of the frame, the method comprising the steps of:

1) installing a first drill bit (7) on a cutter handle (9), machining a first bolt hole in the first seat plate (41), wherein the length of the first drill bit (7) and the cutter handle (9) which are installed together is smaller than the distance between the first seat plate (41) and the second seat plate (42), and the outer diameter of the cutter handle (9) is smaller than or equal to the diameter of the first bolt hole;

2) -disassembling the first drill bit (7);

3) placing a second drill bit (8) between the first seat plate (41) and the second seat plate (42), enabling the second drill bit (8) to pass through the first bolt hole and then be installed on the cutter handle (9), wherein the length of the second drill bit (8) is smaller than the distance between the first seat plate (41) and the second seat plate (42), and the length of the second drill bit (8) and the cutter handle (9) which are installed together is larger than the sum of the distance between the first seat plate (41) and the second seat plate (42) and the thicknesses of the first seat plate (41) and the second seat plate (42);

4) and processing a second bolt hole on the second seat plate (42) by using a second drill bit (8), and detaching the second drill bit (8) after drilling.

2. The method according to claim 1, characterized in that the drilling portions (11) of the first and second drill bits (7, 8) are of standard twist drill construction, and the mounting portions (12) of the first and second drill bits (7, 8) are of threaded connection.

3. A method according to claim 1, characterized in that between the motor suspension mount (3) and the gearbox mount (4) and/or between the frame side beam (2) and the gearbox mount (4) support members are provided.

4. Method according to claim 1, characterized in that a support member is arranged between the first seat plate (41) and the second seat plate (42).