CN102274991A - Drilling processing method for numerically-controlled milling machine with tiltable spindle - Google Patents

Abstract

The invention provides a drilling processing method for a numerically-controlled milling machine with a tiltable spindle. The method comprises the steps of: firstly, mounting and clamping a workpiece to be processed on a machine tool, tilting a spindle of the machine tool around the Y-axis of a machine-tool coordinate system according to the processing requirements, and verifying a tilt angle by adopting a sine protractor so as to enable the spindle of the machine tool to be perpendicular to the surface to be drilled; secondly, mounting and clamping a drill bit on the spindle of the machine tool and controlling to quickly perform cutting feed, so that a drill tip of the drill bit moves to the position of a hole top, and determining coordinates (x0, y0 and z0) of the hole top in a processing coordinate system; and thirdly, by taking the (x0, y0 and z0) as the starting point coordinates for a first drilling, determining end point coordinates (x1, y1 and z1) for the first drilling according to{x1=x0-lsin Alpha}{y1=y0}z1=z0-lcos Alpha}, wherein l is the traveling distance of the drill bit for the first drilling along the direction of a drill hole, retracting the drill bit after the first drilling, then cyclically performing by taking the end point coordinates for drilling last time as the starting point coordinates for drilling next time, until the depth of the drill hole reaches the processing requirement. According to the drilling processing method provided by the invention, under the working condition of poor openness, the drilling processing task that the traditional common numerically-controlled milling machine cannot be completed is completed, and at the same time, the required cost is greatly reduced compared with that of a five-axis machining center.

Description

A kind of tiltable main shaft CNC milling machine drilling method

Technical field

The present invention relates to field of machining, be specially a kind of tiltable main shaft CNC milling machine drilling method.

Background technology

Integrated members such as blisk, impeller and integrated jet nozzle ring provide guarantee for enhancing product performance, but also manufacturing technology have been proposed challenge simultaneously.The most effective way of the efficient high-quality manufacturing of integrated member is digital control processing, owing to will be subjected to blocking of constraint of inside and outside listrium and front and back blade man-hour adding, cause the opening character processed very poor, the processing constraint is many, therefore the processing that will finish these integral structure components fully must employing can make the lathe of main shaft inclination, otherwise will cause some position not process.The Digit Control Machine Tool that present main shaft can tilt only limits to five coordinate machining centers, so the processing of these integrated members must be adopted five coordinate machining center equipment.But five coordinate machining center equipment purchase expenses are too high, and needs 3,000,000～1,000 ten thousand yuan cause that equipment is rare, processing charges increases, and the production cost is risen.

In order to cut down finished cost; on the basis of general NC milling machine, transformed out the CNC milling machine of tiltable main shaft; its characteristics are can be according to processing request, and the machining spindle with milling machine under stopped status tilts, and realizes the processing tasks that script general NC milling machine can't be finished.This tiltable main shaft CNC milling machine reduces greatly than five coordinate machining center costs, but because main shaft tilts, and digital control hole drilling processing method wherein is different with the drilling method of former general NC milling machine, needs the new processing method of redesign.The main distinction of general NC milling machine process and tiltable main shaft CNC milling machine process is:

(1) in machining coordinate system, general NC milling machine boring procedure only relates to cutter axis orientation Z coordinate and changes, and tiltable main shaft CNC milling machine boring procedure relates to two coordinates of Z, X.

Summary of the invention

The technical problem that solves

For solving the problem that lacks tiltable main shaft CNC milling machine drilling method in the prior art, the present invention proposes a kind of tiltable main shaft CNC milling machine drilling method.

Technical scheme

A kind of tiltable main shaft CNC milling machine drilling method that the present invention proposes, in the inclined drill process, the recursion instruction of will holing is decomposed into a plurality of linear interpolation instructions, promptly finishes rapid feed, boring, rapid return cycling by a plurality of straight line instructions, finishes whole boring procedure.

Technical scheme of the present invention is:

Described a kind of tiltable main shaft CNC milling machine drilling method is characterized in that: may further comprise the steps:

Step 1: clamping workpiece to be holed on lathe; According to processing request machine tool chief axis is tilted around the lathe coordinate system Y-axis, and adopt sine gauge checking angle of inclination, make machine tool chief axis and treat that bore surfaces is vertical;

Step 2: clamping drill bit on machine tool chief axis, and, make the drill bit apex point move to the Kong Ding position by digital control system control drill bit rapid feed, determine that the hole withstands on the coordinate (x in the machining coordinate system ₀, y ₀, z ₀);

Step 3: with (x ₀, y ₀, z ₀) as the starting point coordinate that creeps into for the first time, according to

Definite terminal point coordinate (x that once creeps into ₁, y ₁, z ₁), wherein l is the displacement that drill bit once creeps into along boring direction; With the drill bit rollback, then the terminal point coordinate that creeps into the last time again carry out step 3 as the starting point coordinate circulation of newly once creeping into, and reaches processing request until hole depth after once creeping into.

Beneficial effect

Adopt this method can realize the boring processing of tiltable main shaft CNC milling machine, be implemented under the very poor condition of work of opening character, the boring processing tasks that script general NC milling machine can't be finished, required expense also reduces greatly than five coordinate machining centers simultaneously.

Description of drawings

Fig. 1: boring schematic diagram;

Wherein 1: standard cutter; 2, drill bit

The specific embodiment

Below in conjunction with specific embodiment the present invention is described:

This embodiment is processing that aero-engine casing is holed, owing to be fixed with the blade of blisk in the casing, cause and block, make the general NC lathe to process, and processing cost is limited, can't adopt five coordinate machining centers, processing so employing tiltable main shaft CNC milling machine is holed.

Step 1: clamping casing on lathe; And machine tool chief axis tilted around lathe coordinate system Y direction, and adopt sine gauge checking angle of inclination, make machine tool chief axis and casing treat that bore surfaces is vertical; After having determined the angle of inclination of machine tool chief axis, clamping standard cutter on machine tool chief axis, feed makes machine tool chief axis central axis and hole to be processed central axes, and measures cutter summit and the distance for the treatment of bore surfaces, i.e. P point and the distance for the treatment of bore surfaces among Fig. 1;

Step 2: the drill bit that on machine tool chief axis, changes the outfit, the drill bit summit overlaps with the standard cutter summit, the P point that obtains according to step 1 by digital control system with treat bore surfaces apart from feed, make the drill bit summit move to the top, hole, determining to portal withstands on coordinate (x in the machining coordinate system ₀, y ₀, z ₀);

Step 3: with (x ₀, y ₀, z ₀) as the starting point coordinate that creeps into for the first time, according to

Definite terminal point coordinate (x that once creeps into ₁, y ₁, z ₁), wherein l is the displacement that drill bit once creeps into along boring direction; After once creeping into drill bit by the original route rollback, then the terminal point coordinate that creeps into the last time again carry out step 3 as the starting point coordinate circulation of newly once creeping into, and is a plurality of linear interpolations circulation borings, reaches processing request until hole depth.

Claims (1)

1. tiltable main shaft CNC milling machine drilling method is characterized in that: may further comprise the steps:

Step 1: clamping workpiece to be holed on lathe; According to processing request machine tool chief axis is tilted around lathe coordinate system Y direction, and adopt sine gauge checking angle of inclination, make machine tool chief axis and treat that bore surfaces is vertical;

Step 2: clamping drill bit on machine tool chief axis, and, make the drill bit apex point move to the Kong Ding position by digital control system control drill bit rapid feed, determine that the hole withstands on the coordinate (x in the machining coordinate system ₀, y ₀, z ₀);

Step 3: with (x ₀, y ₀, z ₀) as the starting point coordinate that creeps into for the first time, according to

Definite terminal point coordinate (x that once creeps into ₁, y ₁, z ₁), wherein l is the displacement that drill bit once creeps into along boring direction; With the drill bit rollback, then the terminal point coordinate that creeps into the last time again carry out step 3 as the starting point coordinate circulation of newly once creeping into, and reaches processing request until hole depth after once creeping into.

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