JP3241066B2 - Laser bending method of ceramics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention, ceramics bending irradiated with the heating beam to the part for, by heating to a locally bendable softening zone, ceramics with a laser to perform the bending bend Related to processing method.

[0002]

2. Description of the Related Art Ceramics are obtained by compounding various inorganic substances and sintering them at a high temperature, and are dense aggregates of mineral microcrystals. For example, alumina ceramics containing alumina (Al2 O3) of 90% or more have large mechanical / electrical properties / heat / abrasion resistance, good thermal properties, good insulation, no particular water absorption, etc. And the material is selected according to the application.

[0003] Conventionally, ceramics are formed by a mold before sintering, and cannot be formed after sintering.
Therefore, it is particularly desirable that the shape can be changed by appropriately bending a sintered ceramic plate material in the production of many kinds and in small quantities.

By the way, as a result of repeating many years of research and experiment, the inventors of the present invention irradiate a laser beam having a high energy density to a bent portion of ceramics to locally form the laser beam. It was noted that heating could form a required shape of bend.

[0004]

Means for Solving the Problems Conventional problems as described above
In view of the above, the present invention is to heat and bend ceramics
The heating range for the ceramics
Approximately 600 ° C by irradiating a laser beam so that it becomes wider
After preheating to
The laser beam is softened to a softened state by local irradiation
Heating to the softening temperature and bending to this local softening temperature part
Is a method of bending ceramics .

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic explanatory view of one embodiment of a laser bending apparatus according to the present invention. In the figure, a laser processing unit 3 of a laser bending apparatus 1 includes a carriage base 7,
It comprises an X-axis guide rail 9, a carriage 11, a Y-axis guide rail 13, a carriage 15, a processing head 17 and a nozzle 19. The carriage base 7 is fixed to the frame 21 downward, and the X-axis guide rail 9 provided on the carriage base 7 is provided in the X-axis direction perpendicular to the drawing, so that the carriage 11 is movable in the X-axis direction. Y-axis guide rail 13 provided on carriage 11
Can move the carriage 15 in the Y-axis direction parallel to the drawing.

The processing head 17 is provided downward on the carriage 15, and holds a laser beam LB oscillated from a laser oscillator (not shown) via a nozzle 19 provided at the tip of the processing head 17. Utensil 25,
Locally irradiates ceramics 29 held between 27, and is movable in X and Y axis directions.

The laser bending apparatus 1 configured as described above irradiates the laser beam LB to the ceramic disc 29 by the laser processing section 3, and in this embodiment, goes through a preheating step and then to a main heating step. . In the preheating step, the laser beam LB is irradiated to the bent portion of the ceramics 29 with a wide heating range so as not to cause a crack due to local heating, and the mechanical strength (bending strength) is reduced to a softened state. Slow preheating to a suitable preheating temperature of about 600 ° C. below the so-called softening zone (FIG. 2). In this case, for example, a laser for the ceramics 29
-Easy change by changing the focal position of the beam LB
It can do heat .

After the ceramics 29 is sufficiently preheated, in the main heating step, the focal position of the laser beam LB with respect to the ceramics 29 is changed to locally focus and irradiate the bent portion of the ceramics 29 to heat the ceramics 29. When the temperature reaches the softening zone , plastic deformation occurs, and bending can be performed without using a special mold or the like.
This is to carry out the spinning process .

As shown in FIG. 2, the softening zone of ceramics ((A) to (G)) of various materials is about 80%.
A temperature range of about 0 ° C. to about 1400 ° C. is a temperature range in which the bending strength is reduced, no crack is generated in the bending process, and no melting occurs.

However, for example, alumina-based ceramics (E) have a small decrease in bending strength in a temperature range of 800 ° C. to 1400 ° C., and have a softening zone of about 1600 ° C., exceeding about 1800 ° C. and about 2300 ° C. Shrinkage occurs in the vicinity, leading to melting (vitrification).

By the way, the processing unit 5 bend provided in Figure 1, the bending tool 33 of the processing unit 5 bending ceramic 29 having reached the softening point by the laser machining unit 3 is rotatably supported on the shaft 31, shown By being rotated by a driving force that is not performed, the bending of the ceramics 29 can be ensured, and the accuracy of the bending angle can be maintained.

[0013] the bent portion of this way, ceramics 29
Minute, before the main heating step allowed to rise to plastic deformation was heated locally softened zone, by preheating in a preheating step, cracks due to plastic deformation that may occur in the ceramic 29 is effectively prevented.

Accordingly, an appropriate preheating temperature of about 600 ° C. is selected, and the softening zone is selected according to the material. Note that ceramics (F) is Newum Light (trade name) and ceramics (G) is magnesia (M
G). Further, according to other documents (not shown) concerning various alumina-based ceramics, various temperatures within a range of 1450 ° C. to 2040 ° C. are specified as the softening zone.

[0015]

The present invention can be understood from the above description of the embodiments.
As described above, in the present invention, the bending of the ceramics 29 is performed.
To do so, first make the heating range wider
Irradiates the laser beam LB to the surface 29 and softens
Before it reaches about 600 ° C. So
Then, the laser beam LB is locally applied to the bent portion.
Heat to the softening temperature at which it softens by
Bending is performed on the local softening temperature portion .

Thus, according to the present invention,
Bending is performed on the desired part without cracking
At this time, about 600 ° C
Preheating up to the softening temperature and heating up to the softening temperature
Because it is performed by irradiation, for example, ceramics
By changing the focal position of the laser beam with respect to
From a wide range of preheating
Heating to local softening temperature can be performed continuously.
Efficiently and efficiently bends ceramics 29
It is something that can be done .

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of one embodiment of a laser bending apparatus according to the present invention.

FIG. 2 is a diagram showing a change in bending strength of various ceramics with respect to a temperature change.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser bending apparatus 3 Laser processing part 5 Bending processing part 17 Processing head 29 Ceramics 33 Bending tool LB Laser beam

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-247018 (JP, A) JP-A-63-212017 (JP, A) JP-A-63-182279 (JP, A) JP-A-2- 212381 (JP, A) JP-A-3-107434 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C04B 41/80-41/91

Claims (1)

(57) [Claims] 1. A method of bending a ceramic by heating the ceramic.
In the method, heating range for ceramics (29)
Irradiate the laser beam (LB) so that
After preheating to about 00 ° C, the above ceramics (29)
The laser beam (LB) is locally collected at the bent part
Heat to the softening temperature to be softened by light irradiation.
A method for bending ceramics using a laser , wherein bending is performed on a typical softening temperature portion .