JPS5813486A - Electron beam welding device - Google Patents

Abstract

PURPOSE:To prevent internal defects and to improve the quality of welding by controlling oscillation in an arbitrary constant direction with respect to the direction tangential to a weld line. CONSTITUTION:An operator 19 receives a speed signal Vx in a direction x, a speed signal Vy in a direction Y, an oscillation direction signal alpha, and a basic wave generating signal f (A, wt) for oscillation as input signals and operates these signals so as to generate oscillation f(A, wt) wherein the oscillation direction with respect to the weld line is alpha, and outputs Ix, Iy. The Ix drives an X deflection coil 14 and Iy and Y deflection coil 15, and an electron beam 2 is subjected to synthesized deflection. In other words, the electron beam 2 performs the oscillation wherein the oscillation direction with respect to the weld line is alpha, the amplitude is A and the angular frequency is w.

Description

[Detailed Description of the Invention] It is an object of the present invention to provide an electron beam welding device that can always perform oscillation at an angle of one foot with respect to the tangential direction of the welding line, even in the case of an FMI line. It is something to do.

In this type of conventional technology, an electron beam welding device is used to weld the electron beam at a predetermined position on the welding edge in order to eliminate internal defects such as proholes in the weld and improve welding quality. A method is used in which welding is performed while oscillating at a frequency and amplitude of . In other words, an electron beam welding device usually has a configuration as shown in FIG. In the figure, an electron beam λ is generated by an electron gun 1, and the molten mm4t of the workpiece 3 placed on the XY table 3 is irradiated with the electron beam to perform welding. In order to perform welding along the welding line, the X table movement signal Lx generated by the table movement control device Ilb is amplified by an amplifier, inputted to the X table drive motor, and moved by the Y tape I. The signal Ly is amplified by an amplifier g and inputted to the Y tape l drive motor 10 to control the XY tape l to S, respectively. On the other hand, the X deflection signal Ix generated by the oscillation generator //
is amplified by a deflection amplifier /J and added to the X deflection coil /y, and the Y deflection signal IY is amplified by a deflection amplifier /3, is being carried out.

Therefore, when the weld line is a curve, the oscillation direction across the weld line changes as shown in FIG. That is, if the angle of the weld M, 2/ with respect to the X-axis direction λ3 at any point B on the weld line is θ, and the angle of the oscillation direction, 1.2 with respect to the −／
The oscillation direction - one angle α is α = β - θ
However, if β is fixed and the weld line is a curve, θ
As a result, α changes, and even if the acceleration voltage and υ・N current of the electron beam are constant, the energy density that the welding part of the workpiece receives from the electron beam changes, As a result, the effect of oscillation for preventing internal defects decreases, causing a decrease in welding quality. In the present invention, the angle, amplitude, and frequency of oscillation with respect to the welding line are always constant in all cases where the shape of the welding line is a straight line or curved line. In this regard, the welding quality is improved by keeping the energy density constant and uniformizing the oscillation effect to prevent internal defects.

In Fig. 3, which explains the principle for achieving the object of the present invention, if the welding direction with respect to the −C and x-axes is θ and the welding speed is The Y-axis direction component is vy.

The angle of the oscillation direction with respect to the welding direction is α,
The oscillation waveform is the general Kf(A,
ω1) (where t is time), the X-direction component factor x and Y-direction component factor y of the oscillation are expressed as f below.
i+ , (satisfying formula 21・Ix=f(A,
ωt), cos(θ−+d)=f(A, ωi) (c
osθcosα−81 series θsinα):=f(A, ωt
) l V Oosα-affected S1nαi-・-, -am
Iy=f(A, ωt), 5in(θ-fd) =f(A
, ωt) (sin θ CO8 α + cos θ sin α) = f
(A#ωt) When the welding speed V is known, 'Vx and Vy are detected by speed signal detectors in the X and Y axis directions,
From the angle α in the oscillation direction, sin α, t'os
If α is calculated using the usual method, then the equation f11 (21 gives the oscillation direction component Ix in the X-axis and Y-axis directions,
is determined, the oscillation with the oscillation direction α and the amplitude A is obtained with respect to the welding direction. If the welding speed ■ is unknown, v from the above ■x and Vy.
=V■”+vy'rc is obtained.

An embodiment of the present invention will be described below with reference to the drawings.For convenience, parts corresponding to FIG. 1 are designated by the same reference numerals. 9th
The figure is a schematic block diagram of a device according to the present invention, where l is an electron gun;
ko is the electron beam, 3 is the object to be welded, l is the welding line, 3 is XY
The table 6 is a table movement control device, and the table movement control device 6 draws the weld fj14I of the workpiece 3 along the tip of the electron beam. For this purpose, an X-direction movement signal Lx and a Y-direction movement signal Ly are outputted from the table movement control device Wb using electric means, and an amplifier, ? , f, X table drive motor9. A weld m-da is drawn on the workpiece 3 while a composite feed is applied to the table 3 via the Y-table drive motor IO. This is the same as the case in FIG. However, in this invention, the following code 76 is newly added.
The part ~−〇 is added.

First, 16 is a first detector for detecting the X-axis direction velocity signal of the XY table, which outputs the X-direction velocity signal Vx using the X-direction movement signal Lx as an input signal, and /7 is the first detector for detecting the X-axis direction velocity signal of the XY table. A first detector for detecting an axial speed signal outputs a Y-direction speed signal vy using the Y-direction movement signal LY as an input signal. llt is an oscillation direction setting device, which sets the direction of oscillation for the welding line bow, and its output signal is α, and l/ is an oscillation generator, as can be seen in Fig. 1. A fundamental wave f(A, ωt) of oscillation is generated. /9
is an arithmetic unit and the signal "X r vy*α, f(A
, ωt) as input and calculate the following equations T3) and T4) with reference to equations tll and +21. The calculation result Ix is amplified by the X deflection amplifier 7.2 - [The X deflection coil/4t is driven to deflect the electronic beamco as shown in IX in FIG. -C
Drive the Y deflection coil /j and direct the electron beam λ to 1 in Figure 3.
It is deflected as shown by y, and by the combined signal of IX &i'l, the electron beamcower is deflected as shown by C at 22' in the direction of the weld line C/ and an angle α in FIG. 1x is I
1y is a temporal representation of x, and 1y is a temporal representation of y.

However, ■ is the welding speed, and if the value is known, it can be used as is, but if it is unknown, it may be calculated by calculating V=Vv 2+7Ayuki.

f(A, ωt) A represents the amplitude of oscillation, and ω represents the angular velocity. FIG. S shows a state in which the fundamental wave of oscillation f(A, ωt) f is a sine wave, and the oscillation direction 2- is a constant trap with respect to the welding tssi when the present invention is applied.

The operation of the device configured in this way is as follows.

The table movement control device B controls the X direction movement signal Lx and the Y direction so that the electron beam generated by the electron gun / is irradiated along the weld M4' of the workpiece J placed on the XY table j. A movement signal Ly is generated, and Lx is amplified by the amplifier to fully drive the X table drive motor 9, and Ly is amplified by the amplifier flc to drive the Y tape 5.
Drive the full drive motor 10. X direction movement signal LX
is converted into an X-direction speed signal Vx by the detector 16, and a Y-direction movement signal Ly is converted into a Y-direction speed signal vy by the detector/7. The oscillation direction signal for welding IiIλl is α, and the oscillation fundamental wave generation signal is f(A
, ωt), the oscillation direction setter 7g generates α, and the oscillation generator // generates f(A, ωt).
) occurs. The arithmetic unit 19 uses the X-direction speed signal Vx, the Y-direction speed signal vy, the oscillation direction signal α, and the oscillation fundamental wave generation signal f(A, ωt) as input signals, so that the oscillation direction for the welding 11-2/ is α. Formula (
3) Perform calculations according to (4) and output Ix and Iy. IX connects the X deflection coil/
4', and Iy drives the Y deflection coil /j through the Y deflection amplifier iJ, so the electronic beamco uses the A combined deflection of the deflections Iyll and 1y due to j is performed. In other words, melt! The electronic beamco will perform oscillation 2-' with respect to ll5 in which the oscillation direction is α, the amplitude is A, and the angular frequency is ω.

As mentioned above, in the conventional method, the oscillation control device is independent of the table control as shown in the block diagram of the electron beam welding device in Figure 1. Since the waveform was not constant for welding 11.2/, the energy density was not constant, but in the present invention, the angle θ with respect to the weld line is However, since the angle α is always constant (therefore, β is constantly changing), the oscillation direction 22 is always constant with respect to the welding line.As described above, according to the present invention, According to this method, the oscillation direction can be maintained at a predetermined constant value with respect to the weld line, which is effective in improving welding quality.

[Brief explanation of drawings]

Figure 1 is a schematic block diagram of a conventional electron beam welding device.
Fig. 1 is a diagram showing the relationship between the welding line and the oscillation direction when the welding line is a curve, and Fig. 3 is a diagram for explaining the principle of the present invention showing the relationship between the welding direction and the oscillation direction.
FIG. 9 is a schematic block diagram of a Kameko beam device according to an embodiment of the present invention, and FIG. S is a diagram showing the relationship between the weld line and the oscillation direction in the present invention. /... Electron gun; Co... Electron beam; 3... Work to be welded; l
I-・Welding line; 3・・XY table; 6@・Table movement control device; ri・・magnifier; detector; l・・e first detector; /l・・oscillation direction setting device; ti・
・Oscillation generator; /9・1 arithmetic unit; 1.2...
X deflection amplifier; 13...Y deflection amplifier; 14!・@X deflection coil; /S...Y deflection coil. Patent applicant: Nissei Co., Ltd., Steelworks Procedures Amendment (voluntary) August 26, 1980, Indication of the case of the Director General of the Temple Office 1981 Patent Application No. togg! Name of invention r6 Relationship to the case of person amending an electron beam welding device Name of patent applicant (4cXZ) Japan Steel Works Co., Ltd. Agent 443-

Claims (1)

[Claims] Place the workpiece on the XY table, move it to a predetermined position using a table moving device, and deflect the electron beam to apply it to the welding line of the workpiece to create an arbitrary curve on the workpiece. seventh and first detectors for respectively detecting velocity signals in the -C, X and Y directions in an electron beam welding device that performs welding; and an oscillation generator that provides oscillation to the welding line. , an oscillation direction setting device for setting the direction of oscillation with respect to the welding line, and a computing device for calculating each signal output from these detectors, oscillation generators, and direction setting devices. An electron beam welding device characterized in that oscillation is controlled in any fixed direction with respect to the tangential direction of a line.