CN2501617Y

CN2501617Y - Improved declination compensating circuit board forming milling cutter

Info

Publication number: CN2501617Y
Application number: CN 01267246
Authority: CN
Inventors: 周治云; 璩泽中
Original assignee: KAIWEI ELECTRONIC CO Ltd
Current assignee: KAIWEI ELECTRONIC CO Ltd
Priority date: 2001-10-26
Filing date: 2001-10-26
Publication date: 2002-07-24
Anticipated expiration: 2011-10-26

Abstract

The utility model relates to an improved declination compensating circuit board forming milling cutter which aims to improve the common milling cutter of a circuit board, and the milling cutter forms a right circular cylinder shape. The utility model is characterized in that the cutting edge of the milling cutter, which directs to a face cutting, is in the cone shape when rotating along the central axis of the milling cutter and has a positive conical surface structure. The conicity bending-declining amount of the positive conical surface structure can increase the rigidity of the milling cutter, and the cutting impedance increases declining radial direction component force so as to relatively reduce the declining force; the declination of the central axis, which is generated by the cutting impedance when cross cutting carried out, is compensated; the quality of planeness and dimensional accuracy of a machined surface for milling-cutter contour machining can be effectively improved, and processing quality and cutter life are improved, which enables the utility model to have practicability.

Description

But the circuit board molding milling cutter of improved compensating deflection

Technical field

The utility model relates to a kind of printed circuit board forming milling cutter, but particularly a kind of effective raising machining accuracy and keep the circuit board molding milling cutter of smooth compensating deflection.

Background technology

Present various printed circuit board (PCB) (PCB, Printed Circuit Board) processing of non-small sircle hole in finished product or semi-finished product edges of boards and the plate, the overwhelming majority adopts milling cutter processing, and milling cutter 1 commonly used, as shown in Figure 1, has columniform handle 2, add man-hour and be central axis 3 rotations, and, move radially again according to after moving axially to the starting point of machining according to cylinder, and the blade 4 that utilizes milling cutter 1 produces the effect of machining, to finish the processing result of design in advance.The used blade design of present again employed milling cutter 1 cross cutting, if according to its central axis 3 rotations, all cylindrical, when (as single circuit board) or processing machine rigidity are preferable when light load is cut, still certain milling processing quality be can keep, the dimensional accuracy of machined surface and flatness etc. comprised.

But when considering product yield and processing cost, the higher load cutting is as utilizing two above circuit board lap positions processing, be a large amount of working conditions that often are used, as shown in Figure 2, three circuit boards, cutting impedance and reaction force that it produced are bigger, and milling add be divided into again man-hour mill (UP-CUT) face 5 and under mill (DOWN-CUT) face 6, the direction of the stressed deflection of central axis is also inequality therebetween, therefore regular meeting causes milling cutter 1 stressed displacement and curving, wherein, more than mill (UP-CUT) face 5, its lower surface 7 (promptly second, the milling face of three circuit boards) it is gradually recessed and form cambered surface that distortion deflection 8 is upwards milled face 5, makes lower surface 7 sizes greater than upper surface 9 sizes; Otherwise, below mill (UP-CUT) face 6, the distortion deflection 11 of its lower surface 10 (being the milling face of second and third sheet circuit board) is milled face 6 downwards and is gradually protruded and form cambered surface, makes the size of lower surface 10 sizes less than upper surface 12; And the displacement of in-plane all can be by the procedure correction, and the machined surface that has deflection 8 and 11 only is out of plumb thereupon also, causes milling cutter 1 and adds the man-hour groove in milling and produce distortion, makes size of finished face bad; Generally then reduce output (monolithic milling) or diligent tool changing tool and avoid, still do not have other good countermeasure in addition.

This creator can't effectively handle thoughts on above-mentioned cutter commonly used and overcome this problem, thereby sets about design to improve end with research and have design of the present utility model to produce.

Summary of the invention

But the utility model is the circuit board molding milling cutter that a kind of improved compensating deflection will be provided, and adds can compensate man-hour with solution and processes stressed and central shaft out of plumb variation that produce, and improve crudy and improve the technical problem of cutter life.

It is such solving the problems of the technologies described above the technical scheme that is adopted:

But a kind of circuit board molding milling cutter of improved compensating deflection is characterized in that: its central axis rotation to milling cutter of blade that this milling cutter points to the cutting face forms a positive cone structure, and the tail end tapering of this positive cone structure partly constitutes a tapering curving amount.

The utility model is at horizontal milling processing, the blade that this milling cutter points to the cutting face is during for the central axis rotation of this milling cutter, can form a positive cone structure, make the tapering curving amount of this cone structure, increase the rigidity of milling cutter tail end, and make cutting impedance increase clino-diagonal reduce deflecting force relatively to component, the deflection that central axis produces because of the cutting impedance when cutting with compensate for lateral, and can compensate down mill (DOWN-CUT) or on machined surface produces because of the milling cutter deflection when milling (UP-CUT) cross cutting quality variation, process stressed and central shaft out of plumb variation that produce thereby solved to add to compensate man-hour, and improve crudy and improve the technical problem of cutter life.

The utility model is simple in structure, it presents a positive cone structure for this milling cutter central axis rotation the blade of this milling cutter sensing cutting, the tapering curving amount of this cone structure, with compensate down mill or on the cross cutting time cutting reaction force that mills to deflection that central axis was produced, and can effectively improve the dimensional accuracy of machined surface and keep flatness, and the tool practicality.

Description of drawings

Fig. 1 is the structure cross-sectional schematic of known milling cutter;

Fig. 2 is known milling cutter adds the groove in man-hour in milling a distortion schematic diagram;

Fig. 3 is the structure cross-sectional schematic of the utility model one embodiment.

The specific embodiment

As shown in Figure 3, the utility model " but circuit board molding milling cutter of improved compensating deflection " is improved at circuit board vertical cyclindrical shape milling cutter 1 commonly used, the blade 14 that it is characterized in that the sensing cutting face of milling cutter 13, during for central axis 15 rotation of this milling cutter, all be conical, and form the positive conical surface 16 structures, the cutting stressed deflection of central axis that impedance was produced caused the machined surface quality variation of deviation thereupon when the tapering curving amount 17 of these the positive conical surface 16 structures was cut with compensate for lateral, made milling cutter 13 processing and forming of milling comprise that the quality of size of finished face precision and flatness all can effectively improve.

Be to change about the curving amount size of the positive conical surface again with milling cutter length or circle footpath size or milling rotating speed, basically with the production and processing processing procedure, selected constant can be used as in superimposed sheets number and gross thickness, milling cutter length and the circle footpath of circuit board, and the milling cutter rotating speed when considering milling and being calculated, and remaking the actual test that intersection cooperates, the milling cutter that then can obtain best of breed and structure uses for production and processing.

In sum, be difficult to though structure of the present utility model and technological means thereof are non-, do not see have same structure to be disclosed in before, and can reach the use effect of expection again really, so should have novelty and advance, meet each important document of utility model patent, so propose utility application in accordance with the law.

Claims

But 1, a kind of circuit board molding milling cutter of improved compensating deflection, it is characterized in that: the blade in this milling cutter sensing cutting face is conical to the central axis rotation of this milling cutter, have a positive cone structure, the tail end tapering of this positive cone structure partly constitutes a tapering curving amount.