CN109366208B

CN109366208B - Clamping and positioning method for machining blade body profile of double-journal rectifying blade

Info

Publication number: CN109366208B
Application number: CN201811488725.4A
Authority: CN
Inventors: 王家俊; 殷明; 刘瑜; 刘昂
Original assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Current assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Priority date: 2018-12-06
Filing date: 2018-12-06
Publication date: 2021-01-22
Anticipated expiration: 2038-12-06
Also published as: CN109366208A

Abstract

The invention discloses a clamping and positioning method for machining a blade body profile of a double-journal rectification blade. A0 position positioning program is executed to feed to a specified position on the blade, then the blade is manually rotated to be in contact with the cutter bar, the positioning end face is tightly attached to the bushing, the bushing is tightly attached to the end face of the cutter handle, the cutter handle on the main A shaft is locked, and then the cutter handle on the auxiliary A shaft is locked. After the tool shanks at the two ends of the blade are locked, the positioning tool bar is lifted and returned to the tool magazine, and the blade is clamped.

Description

Clamping and positioning method for machining blade body profile of double-journal rectifying blade

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a clamping and positioning method for machining a blade profile of a double-journal rectifying blade.

Background

At present, one side of the clamping for processing the double-journal rectifying blade is clamped by a special tool, and the other end of the clamping is tightly propped by a tip. The clamping needs point positioning on the blade body, so that positioning point interference exists when the blade body profile is milled, a part of the blade body cannot be machined, the workload is increased for subsequent polishing, and the tip is tightly pressed to generate bending deformation.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the clamping and positioning method for machining the blade body profile of the double-journal rectifying blade is provided, and the defects of clamping and positioning of the existing double-journal rectifying blade are overcome, so that the blade is more effectively clamped and positioned.

Aiming at clamping and positioning when a blade body profile of a double-journal rectifying blade is processed, the invention provides the following technical scheme:

step one, respectively installing two tool handles (the tool handles are the same as an A shaft interface of the machine tool) on a main A shaft and an auxiliary A shaft of a five-shaft double-drive numerical control machine tool, and matching with a straight jacket with a proper diameter with a blade shaft neck to clamp the blade shaft neck; during clamping, the shaft neck of the blade positioning end is placed into the tool handle on the main shaft A and is not locked, and the shaft neck at the other end is placed into the tool handle on the auxiliary shaft A and is not locked;

step two, executing an A0 positioning program to feed to a specified position on the blade (coordinates draw a cutter bar point from a blade blank), manually rotating the blade to contact with the cutter bar, positioning the end face to a bushing (a space is reserved by adding a bushing to process a blade tip end face), enabling the bushing to be attached to the end face of the cutter handle, locking the cutter handle on the main A shaft firstly, and then locking the cutter handle on the auxiliary A shaft;

and step three, after the tool shanks at the two ends of the blade are locked, lifting the positioning tool bar and returning the positioning tool bar to the tool magazine, and clamping the blade.

The specified position in the second step is determined by the following method, an X axis of a rotating workpiece coordinate system in UG is parallel to the chord length of the blade at an angle, a cylinder is created along the vector direction of a Y axis of the workpiece coordinate system, and the bottom edge of the cylinder is rounded; then extracting a section line at the section of the blade body rough material, moving the center of the cylinder to the section line which is back to the section line, moving the cylinder outwards along the X-axis direction of a workpiece coordinate system, contacting the bottom edge of the cylinder with the blade rough material, taking out the coordinate of the center of the cylinder, converting the coordinate into the coordinate under a processing coordinate system, manually writing an A0 positioning program, and feeding the blade to a specified point position.

Compared with the existing clamping and positioning method, after the blade is clamped and positioned, the blade body is completely exposed, the profile of the whole blade body can be processed, including the blade tip end face, the two ends clamp the A shaft to rotate in a double-drive mode, the jacking force generated by jacking the tip cannot be generated, and the blade cannot be jacked and deformed. And need not design special frock, can save the expense for the development progress.

Drawings

FIG. 1 is a schematic view of a blade clamp;

fig. 2 is a diagram of milling blade body and blade burrs.

Detailed Description

The technical solution of the present invention is further explained below with reference to the accompanying drawings, but the claimed protection scope is not limited to the above.

Taking a zero-order guide blade as an example, blade blanks (shown in fig. 2) are small-allowance die forging blanks, theoretically, an allowance of 0.6mm is reserved on the single surface of a basin back of a blade body profile, an allowance of 1.5mm is reserved on the front edge and the rear edge of the basin back, and allowances of 2mm are reserved on a circular truncated cone in the radial direction and the axial direction. And machining a blade body profile, a circular truncated cone runner surface, a circular truncated cone surface and a blade tip end surface on a five-axis double-drive numerical control machine tool.

1. Rotating the workpiece coordinate system in UG by an angle to make the X-axis substantially parallel to the chord length of the blade, and creating a vector along the Y-axis of the workpiece coordinate systemDiameter of

The bottom edge of the cylinder is rounded by 0.5 mm; and then extracting a section line at the section of the blade body rough material III, moving the center of the cylinder to the section line back to the center, and moving the cylinder outwards for 4.5mm along the X-axis direction of a workpiece coordinate system to ensure that the bottom edge R of the cylinder (the bottom edge R of the cylinder is the bottom rounding of the cutter bar) is just contacted with the blade rough material. And (4) taking out the coordinates of the center of the cylinder, and converting the coordinates into the coordinates in the machining coordinate system. Regarding the selection of the blade body blank section iii, it should be noted that the blade is formed by stretching a plurality of groups of sections through curve groups, the selected section position is a section generally in the middle section of the blade body, and the positioning point is selected as far as possible in the position close to the edge of the blank blade back, because the farther from the selection center, the smaller the theoretical error of the blank allowance change to the positioned position a0 is, and the position of the straight line in fig. 2 is selected as the position of the section iii in this embodiment.

2. A knife handle of BT 5032-165 is respectively installed on a main shaft A and an auxiliary shaft A of the machine tool, a THC 32-10 straight jacket is matched, shaft necks at two ends of a blade are respectively inserted into the knife handles, and the knife handles are not locked. The invention has no special requirement on the bushing, only the blade extends out, a gap is reserved between the blade tip and the end surface of the cutter handle, the milling cutter can enter the blade tip to cut off the blade tip, the surface of the circular truncated cone can be milled to process more areas, the diameter of the inner hole of the bushing is larger than that of the shaft neck of the blade, and the length is generally larger than 8 mm.

3. Mounting a diameter on a machine tool

The cutter bar of (1) manually works out an A0 position positioning program, calls a processing coordinate system G54, rotates an A shaft for a fixed angle, keeps the blade approximately horizontal, and feeds to the position of a coordinate point obtained before. It should be noted that, regarding a0, a blade body of a blade part needs to be milled by rotating around an axis a, blade clamping needs to determine an axis a zero point of a machining coordinate system, a conventional blade body clamp for numerical control milling has a positioning point on a clamp, and the blade body is fixed by leaning on the positioning point, but the positioning method of the invention does not need a special clamp, and only needs a tool shank of a universal interface to be arranged on a main axis a and an auxiliary axis a of a double-drive five-axis numerical control machine toolOn, in the biax neck blade both ends axle journal inserted the handle of a knife, A axle direction of rotation can't pass through self fixed position. A0 represents the zero position of the a axis of the machining coordinate system and the a0 positioning program is a manually written program known to the operator familiar with machining center programming and will not be described in detail herein. And feeding to a blade body woolen positioning point selected from UG by executing a program, enabling the blade back of the blade to lean against the cutter bar, locking the cutter handle to clamp the blade, and returning the blade to the tool magazine.

4. The blade is manually rotated to enable the blade back to be in contact with the cutter bar, the blade is translated to enable the positioning end face to be attached to the lining, the lining is attached to the end face of the cutter handle, the cutter handle on the main shaft A is locked firstly, the cutter handle on the auxiliary shaft A is locked secondly, the cutter is manually lifted, the cutter is returned to the cutter base, and therefore the blade is clamped and positioned.

Machining tests show that the clamping and positioning method has small machining deformation, and can machine the blade body profile, the circular truncated cone runner surface, the circular table surface and the blade tip end surface by one-time clamping, so that the machining efficiency is greatly improved.

Claims

1. A clamping and positioning method for machining a blade body profile of a double-journal rectifying blade is characterized by comprising the following steps:

step one, respectively installing two tool handles on a main shaft A and an auxiliary shaft A on a five-shaft double-drive numerical control machine tool, and clamping a blade journal by a straight jacket matched with the blade journal with a proper diameter;

step two, executing an A0 positioning program to feed to a specified position on the blade, manually rotating the blade to contact with the cutter bar, enabling the positioning end face to be attached to the lining, enabling the lining to be attached to the end face of the cutter handle, firstly locking the cutter handle on the main A shaft, and then locking the cutter handle on the auxiliary A shaft, wherein the specified position is determined by the following method, rotating the workpiece coordinate system in UG by an angle to enable the X shaft to be parallel to the chord length of the blade, creating a cylinder along the vector direction of the Y shaft of the workpiece coordinate system, and rounding the bottom edge; then extracting a section line at the section of the blade body rough material, moving the center of the cylinder to the section line back to the center, moving the cylinder outwards along the X-axis direction of a workpiece coordinate system, contacting the bottom edge of the cylinder with the blade rough material, taking out the coordinate of the center of the cylinder, and converting the coordinate into the coordinate under a processing coordinate system;