JPS5877522A - Method and device for heat treatment on inside circumferential surface of hollow work by beam - Google Patents

Abstract

PURPOSE:To treat under heating the inside circumferential surface of the hollow work easily and efficiently by rotating the work around the axial line and moving the same in the axial line direction while radiating beams on the inside circumferential surface of the work in the direction inclined with respect to the axial line of the work. CONSTITUTION:A laser beam radiator 2 consists of a laser beam generating part 4, cylindrical part 6, focusing lens 5, nozzle 7, etc., and is held by a supporter 11 in such a way that an axial line 12 assumes an angle theta to the axial line 13 of the hollow work 1. Said radiator cools the lens 5 with an inert gas introduced through a port 8 and irradiates laser beams B to the surface to be treated under heating through the opening 9 at the preceding end of the nozzle 7 while shielding said surface. On the other hand, while the hollow work 1 fixed to a chuck 21 on a shaft 22 is rotated around the axial line 13 by the operation of a driving device 20, the work ascends in the direction of the axial line 13, and receives heat treatments by the irradiation of said beams B in the required places on the inside circumferential surface 3 thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat treatment method using either a laser beam or an electron beam, and its implementation by the 7J method.
! The present invention relates to a heat treatment apparatus for Il+, and more particularly to a method and apparatus for heat treatment of an inner circumferential surface of a hollow leak. .

Laser beams and electron beams are beams with high non-Q l, -, + energy, and if these beams are used, they can relatively accurately perform local/C heat treatment such as surface hardening of various workpieces. However, the inner circumferential surface of a hollow workpiece extending along one axis (, 1), such as the guide boss bushing of the engine cylinder life XL), is It is generally difficult to heat treat the J1 nail with the beam I). For example, the conventional laser beam C-, J, 6. The laser beam IJ' is guided inside the hollow workpiece along the axis of the hollow workpiece, and the laser beam is directed to the inner peripheral surface of the hollow workpiece by a reflecting mirror J, substantially perpendicularly. The hollow workpiece or the reflecting mirror is moved along the axis of the hollow workpiece while avoiding rotation around the axis of the hollow workpiece.However, a method and apparatus for heat treatment of a laser beam using such a reflecting mirror are disclosed. In this case, the lifespan of the reflector is short, so the reflector must be replaced relatively frequently, and the mirror itself is relatively expensive, so maintenance costs are high. There's a problem.

Furthermore, when heat treating the inner peripheral surface of a hollow workpiece with an electron beam, it is very difficult to bend the electron beam substantially vertically, so the entire electron gun that emits the electron beam is placed inside the hollow part of the hollow workpiece. Therefore, there is a problem in that the hollow workpieces that can be heat-treated by the electron beam are limited to hollow workpieces with a very large diameter into which the entire electron gun can be inserted.

In view of the above-mentioned problems in the conventional method and apparatus for heat-treating the inner peripheral surface of a hollow workpiece using a laser beam, the present invention has been developed to heat-treat the inner peripheral surface of a hollow workpiece using a laser beam without using a reflecting mirror. In addition, when using an electron beam (or inserting the entire electron gun into the hollow part of a hollow workpiece), it is possible to avoid hollow leakage (1 degree), which is equivalent to heat treatment of the inner peripheral surface with Inner peripheral surface heat treatment method and equipment J
je supply J <7) (- and command purpose).

According to the present invention, such an object is achieved by providing a method of heat-treating the inner circumferential direction of a hollow workpiece extending along two axes [1-7], and applying heat treatment from the end of the hollow leak to the axes. On the other hand, the slope [)l=lJ direction1. (At least 1 of the 9 hollow beams and 17 devices that radiate a beam in the inner peripheral direction) /J! The rotation about said axis relative to the other is t! , l', 1. A 16h method characterized by moving along the axis, and an apparatus for heat-treating the inner circumferential surface of a hollow leak extending 71 along one axis in a beam, 2. 16 means for supporting the hollow work; means for emitting a beam from one end of the hollow leak toward the inner circumferential surface in a direction I, : : / I, inclined with respect to the axis; and means for rotating and moving at least one of the means for carrying and the means for lifting the bean about the axis relative to each other along the axis. achieved by the device.

According to the heat treatment method and apparatus according to the present invention, there is no need to use an expensive reflecting mirror with a short life even when heat treatment is performed using a laser beam.
In addition, since the process of inserting the laser beam and the reflecting mirror into the hollow part of the hollow workpiece can be omitted, the heat treatment in the inner circumferential direction of the hollow workpiece can be carried out efficiently (Example 4). . Furthermore, when heat treating the inner peripheral surface of a hollow workpiece with an electron beam, it is necessary to insert the entire electron gun into the hollow part of the hollow workpiece so that the electron beam impinges substantially perpendicularly to the inner peripheral surface of the hollow workpiece. Since there is no heat treatment on the inner circumferential surface of a hollow workpiece having a relatively small inner diameter, it is possible to easily heat treat the inner circumferential surface of the hollow workpiece.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments below with reference to the accompanying drawings.

Figures 1 and 81 to 2 show the present invention configured as a heat treatment device using a laser beam.
i l;-(not shown; illustrative longitudinal cross-sectional view; FIG. 1;
112? , 11. This is a hollow workpiece whose inner peripheral surface is to be heat treated by the laser beam radiator 2. The laser beam Ik'>I 1 & fff/2 includes a 1st beam beam section 4 which generates a +1 beam, and a laser beam generating section [this is a laser beam which is A focus lens that directs the beam! ) and a nozzle 7 at the tip of the cylindrical part. As shown in the arrow C, an inert gas (111 gas) nine-person boat 8 is installed to introduce inert gas such as city water gas or J' Live 1'l ga J, i 1 person bo 1-8 then nozzle 7
Focus lens 5 due to the living 11 gases introduced into the
When the heat treatment part of the hollow workpiece 1 is shielded by the gas, the inert gas comes out between the tip of the nozzle 7. 11 '-'-(There is.

L/-(J' heem radiation fA%Ji@2C, Lbe-,
A10-1 /1. L fever 6 one place]! ! ! A supporting device 11 fixed to the frame of the device fixedly holds the hollow workpiece 10 in a state where its axis 12 is inclined at an angle θ with respect to the axis 13 of the hollow workpiece 10. In the illustrated embodiment, the support bosses 1 to 1 of the support device 11 are
14 can adjust its position with respect to the support stand 15 in the left and right directions as shown in the figure, so that the distance between the axis 13 and the front end 9 of the nozzle 7 can be adjusted according to the inner diameter d of the hollow workpiece 1. can be adjusted. Furthermore, the angle of inclination of the arm 16 of the support device 11 with respect to the support post 14 can be adjusted by loosening a knob 17, thereby adjusting the angle between the axis 112 of the laser beam emitting device 2 and the axis 13 of the hollow workpiece 1. The angle θ can be adjusted.

The illustrated heat treatment apparatus further includes the hollow workpiece 1 along its axis 13.
A workpiece carrying device 18 that is rotatable around the axis and capable of reciprocating along the axis, and a drive device 20 that rotates the workpiece supporting device about its axis 19 and moves it reciprocally along the axis 19. have. The axis 19 of the work supporting device 18 and the axis 13 of the hollow work 1 are aligned.1. :
a chuck 2'1 that grips the -C hollow workpiece 1;
It includes shirts 1 to 22 that are integrally constructed with the book. The shaft 22 is received in a sleeve 24 fixed to the frame 23, and a male threaded shaft 25 of a ball-screw set is fixed to the tip of the sleeve 24. The male thread shaft 25 is supported by a ball screw set bearing 26 provided at the lower end of the sleeve 24, and a spur gear 27 is fixed to the lower end of the sleeve 24.

The spur gear 27 is drivingly connected to a hydraulic cylinder 31 via a spline gear R28 of a drive device, an acceleration gear train 29, and a reciprocating motion-to-rotation motion conversion mechanism 30. The workpiece 1 is rotated around its axis 13 and moved up and down along the axis 13. The hydraulic cylinder 31 is shown in the figure, and the hollow workpiece 1 is transferred to the one-knob holding device i18 and the drive device 20 by a limit switch shown in FIG.
, the nozzle 7 of the laser beam emitting device 2 hits the upper end 1' of the hollow 9-1, the hydraulic pressure supplied to it is cut off or its direction of movement is reversed. ing.

In order to carry out the heat treatment method for a hollow workpiece according to the present invention using the heat treatment apparatus as described above, first, the laser beam emitting device 2 is set to a predetermined inclined state, and then the workpiece holding device @1 is set.
8 is lowered to its lowest position, and the hollow work 1 is fixed to the chuck 21 in a state where the axis 13 of the hollow work 1 and the axis 19 of the work supporting device 18 are aligned. Next, the hydraulic cylinder 31 of the drive device 20 is actuated to rotate the hollow work 1 around the axis 13 and raise it along the axis 13, so that the upper end 11 of the hollow work 1 reaches the tip opening of the nozzle 7 of the laser beam emitting device 2. 9, the laser beam emitting device 2 is activated to irradiate the inner peripheral surface 3 of the hollow workpiece 1 with the laser beam 8. Immediately before the upper end 1'' of the hollow workpiece 1 hits the nozzle 7 of the laser beam emitting device 2, the operation of the laser beam emitting device 2 is stopped, and at the same time, the hydraulic cylinder 31 of the driving device 20 is driven in one direction. is reversed and the hollow work 1 is lowered one step. When the work carrying device 18 has been lowered to its lowest position, the operation of the hydraulic cylinder 31 of the drive device 20 is stopped, and the work carrying device & I is lowered. The hollow workpiece 1 that has undergone heat treatment is removed from the boot 21 of B.

In this case, the hollow workpiece 1 may also be heat-treated by the laser beam emitting device 2 when being processed from the position shown in FIG. In addition, when the length of the hollow workpiece is longer than the heat treatment stroke S in the direction of the axis 13, as in the case of the hollow workpiece shown in the figure, the heat treatment stroke 1j of the stroke S from one end as shown in the figure
After performing lj, turn the hollow workpiece 1 upside down and
~The total length is reduced to 1- by performing the heat treatment of S+.
tree) (heat treatment of the inner peripheral surface may be performed).

Note that the feed pitch pt for moving the workpiece 1 every time C1 rotates along the axis 13 may be set to any desired value depending on the heat treatment line f1, and the feed pitch pt for moving the workpiece 1 along the axis 13 may be set to any desired value depending on the heat treatment line f1. By employing a continuously variable transmission as the 16 mechanism, it may be configured such that the feed pitch p can be adjusted as appropriate. Furthermore, in order to improve the self-cooling effect of workpiece 1, the first heat treatment pass was performed with a large value of pitch p, and in the second heat treatment pass, the workpiece was heat treated in a spiral shape by the first heat treatment pass. Heat treatment may be performed between the parts.

In the above, the present invention has been described in detail as a heat treatment method and apparatus using a laser beam, but the present invention can also be constructed as a heat treatment method and apparatus using other beams such as an electron beam. It will be understood that this is also possible. Further, the heat treatment method and apparatus according to the present invention can be configured such that either the hollow work or the beam radiation device is rotated around the axis of the hollow work, and the other is moved along the axis of the hollow work. It will be appreciated that it is also possible to configure the beam emitting device to be rotated about and moved about the axis of the hollow workpiece.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 show a heat treatment apparatus constructed as a heat treatment apparatus using a laser beam, which is used in the present invention at the start stage of heat treatment and at the end of heat treatment, respectively. (This is an illustrative longitudinal cross-sectional view. 1...Hollow workpiece, 1'...! end of the workpiece, 2...
・Laser beam emitting l1IJ device, 33...inner peripheral surface, /
1...1) - Rebeam generator, 5...FJ -h
), L/n(, (1...It'll-shaped part. 7... Nozzle, 8... Inert waste introduction boat,
...Tip opening, 10...Base, 11...Katsumo decoy, 12.13...Axis line, 14...Support boss t-,'
I! ]...Katsu~n. 16... Arm, 17... Knuff, 1B... Work supporting device, 19... Axis line, 20... Drive device, 2'
l...butt ivy, 22...shaft, 2 pieces 3...
No I no l\, 24...Sleeve, 25...Male thread 1/No 1, 26...Bearing, 27...Spur gear, 28
... Spline t'Xノ, 2r) ... Acceleration - Vehicle convoy,
30... Reciprocating motion-rotation interlocking conversion l1jl structure, 31.
・Hydraulic cylinder

Claims (2)

[Claims] (1) A method in which the inner circumferential surface of a hollow work extending along one axis is heat treated with a beam, and the beam is applied to the inner circumferential surface from one end of the hollow work in a direction oblique to the axis. A method characterized in that at least one of the hollow workpiece and the beam-emitting device is rotated relative to each other about the axis and moved along the axis while emitting the beam. (2) A device for heat-treating the inner circumferential surface of a hollow workpiece extending along one axis using a beam; the means for emitting the beam to the inner circumferential surface, and at least one of the means for supporting the hollow work and the means for emitting the beam relative to each other, and Axis line (,7
V+ Fl
L and CJ device.