JPH11106228A - Production of glass by saving and wire saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing glass by a sawing treatment, enabling to straight cut the glass, and to provide a wire saw used for the method. SOLUTION: This method for producing glass by a sawing treatment comprises guiding a cutting wire 17 through guide grooves 19 so that the cutting wire crosses a cutting area 19 at several places having offsets V corresponding to saw-cutting widths in a cutting region 15 laterally limited with two spaced wire-guiding pulleys 11, 12 having the guide grooves 19, respectively, supplying a semi-finished product 9 into the cutting region 15 and subsequently sawing the semi-finished product 9 with the cutting wire in parallel surfaces. The cutting widths with the saw can be adjusted. At least one of the offsets V is formed on the outside of the cutting region 15, without crossing the cutting region with the cutting wire 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for guiding a cutting wire into a guide groove so as to cross a cutting area at several points having an offset corresponding to a saw cutting width, and supplying a semi-finished product to the cutting area. Sawing the semi-finished product into parallel planes with a cutting wire, whereby the sawing width is adjusted within a laterally limited cutting area by two spaced wire guide pulleys each provided with a guide groove, The present invention relates to a method for producing glass by sawing.

Further, the present invention provides at least two spaced wires each having a guide groove for guiding the cutting wire across the cutting area at several locations having an offset corresponding to the sawing width of the wire saw. The present invention relates to a wire saw for applying to a glass manufacturing method having a guide pulley.

[0003]

2. Description of the Prior Art Wire saws of this type are used for sawing, for example, cylindrical blanks, such as semiconductor single crystals, into glass with parallel surfaces. For this purpose, the endless cutting wire is usually guided from the spool on at least one pair of wire guiding pulleys. To guide the cutting wire, the wire guide pulleys are provided with guide grooves on their outer circumference. The cutting wire is inserted into the guide groove so as to cross several cut areas defined by the wire guide pulley. The spacing between the individual wire sections is referred to below as the "offset", which determines the sawing width of the wire saw. Thus, the cutting wire is wound on the trigger drum after passing through the entire cutting area of the wire saw. The semi-finished product is fed into the cutting area, usually continuously from above, and sawn into the glass by means of a circulating cutting wire.

By guiding the cutting wire into the guide grooves of the wire guiding pulley, a desired lateral offset is obtained in the cutting area. The guide groove extends radially around the outer periphery of the wire guide pulley. In known wire saws, the offset is formed in the cutting area by guiding the cutting wire obliquely through the cutting area from one guide groove to the opposing guide groove. This results in a corresponding diagonal saw cut in the semi-finished product, especially when cutting thick glass. This is because a relatively large lateral offset is required.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sawing method for cutting glass straight and a suitable and simple wire saw.

[0006] With respect to this method, the object is to provide a method according to the present invention which improves upon the method described above so that the cutting wire forms at least a portion of the offset "V" outside the cutting region without crossing the cutting region. Achieved.

According to the method of the present invention, the cutting wire can obtain an offset completely or substantially outside the cutting area. There, the cutting wire traverses the cutting area in a direction perpendicular to the longitudinal axis of the wire guide pulley. In this way, oblique cutting of the semi-finished product can be avoided.

If there is a possibility that the oblique cutting can be tolerated, a part of the offset can be formed in the cutting area.
However, if it is desired to completely avoid diagonal cutting, the guide grooves of the plurality of wire guide pulleys that define the cutting region must be arranged facing each other at a minimum distance. In this case, the offset is formed completely outside the cutting area,
One or both wire guide pulleys defining the transverse direction of the cutting area can also contribute to the formation of the offset. For this reason, the cutting wire that does not cross the cutting area is guided to one or several guide grooves corresponding to the offset to be adjusted.

According to a preferred embodiment, the offset is
It is formed by a special wire guiding device. To this end, at least one set of wire guide pulleys with offset guide grooves is provided, in which the cutting wires are separated from one wire guide pulley to form at least part of the offset "V". To the wire guide pulley. Here, the offset wire guide pulley is arranged outside the cutting area. The offset guide groove can be adapted to the offset to be adjusted.

It has proven particularly advantageous to use two sets of wire guide pulleys. Here, the total offset is formed on the offset wire guide pulley, or a portion of the desired total offset is formed on each offset wire guide pulley.

The method according to the invention has proven to be particularly preferred for sawing glass from quartz glass blanks.

[0012] With regard to the device, the technical object described above is such that the cutting wire is guided so as not to cross the cutting area and at least part of the offset "V" is formed by a wire guiding device arranged outside the cutting area. In addition, this is achieved by the present invention which improves the above-described device.

In the device according to the invention, the cutting wire can obtain an offset completely or substantially outside the cutting area. There, the cutting wire traverses the cutting area in a direction perpendicular to the longitudinal axis of the wire guide pulley. In this way, the oblique cutting of the material to be sawed,
It can be completely or substantially avoided.

Depending on the possibility of oblique cutting, the offset may be formed completely or partially outside the cutting area. For this purpose, special wire guiding devices are provided, such as components arranged outside the cutting area or a single wire guiding pulley that limits the transverse direction of the cutting area. In the latter case, for example, corresponding to the offset to be adjusted, the cutting wire is guided in the adjacent guide groove of the wire guide pulley without crossing the cutting area. In thick glass, the required offset, i.e. the desired sawing width of the wire saw, is usually measured at intervals of a number of guide grooves. Both wire guide pulleys also contribute to the offset by providing a cutting wire to a portion of the offset to be adjusted in one wire guide pulley and the other wire guide pulley.

If one wants to avoid diagonal cutting completely,
The guide grooves of the two wire guide pulleys defining the cutting area must be arranged opposite each other so that the distance between the wire guide pulleys is minimized.

[0016] Preferably, at least one set of wire guide pulleys with offset guide grooves is arranged as a wire guide device in which the cutting wire is guided to form an offset "V". . The offset wire guide pulley is located outside the cutting area. The cutting wire is guided in this guide groove so as to pass through one or more offset guide grooves. The spacing between the radially extending offset guide grooves can be adapted to the offset to be adjusted and is therefore different from the spacing of the guide grooves of the wire guide pulley.

In the most preferred embodiment of the wire saw according to the invention, two sets of wire guide pulleys are provided. Here, the offsets are formed on offset wire guide pulleys, or a portion of the desired total offset is formed on each offset wire guide pulley.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail hereinafter with reference to an embodiment and the drawing. FIG. 1 shows a known device with four wire guide pulleys 1, 2, 3 and 4. It is a schematic diagram, these four wire guide pulleys,
They are arranged in a square shape with each other. Wire guide pulley 1
And 2 limit the lateral direction of the cutting area 5, into which the part to be cut is supplied from above. The supply direction of the part to be cut is marked in the direction of arrow 6. Guide grooves extending radially and parallel to each other are provided on the outer circumference of the wire guide pulleys 1, 2, 3, and 4, and the endless cutting wire 7 is guided in the guide grooves. Here, the cutting wire 7 is rewound from a dispenser spool (not shown) and
Several turns are guided around the square arrangement of the wire guide pulleys 1, 2, 3 and 4. In each winding, the cutting wire 7 is offset in the guide groove, so that the cutting wire 7
As can be seen from FIG. 2 showing the upper surface of the cutting region 5,
In the subregions running parallel to one another, the cutting area 5 is crossed several times. After passing through the entire cutting area, the cutting wire 7 is wound on a trigger drum (not shown).

The cutting wire 7 includes wire guide pulleys 1-4.
2 receives a lateral offset "V" in the cutting area, as seen in the top view of FIG. In order to cut thick glass, in known wire saws, a relatively large lateral offset is required due to the cutting wire extending obliquely in the cutting area 5, which results in sooting.

FIG. 3 is a schematic view showing an embodiment of the apparatus according to the present invention, which has wire guide pulleys 11, 12, 13 and 14 arranged in a square shape on one side. The wire guide pulleys 11 and 12 limit the transverse direction of the cutting area 15, into which a quartz glass cylinder 9 (indicated by dashed lines in FIG. 4) is supplied from above. The supply direction of the quartz glass cylinder 9 is marked in the direction of arrow 16. Each of the wire guide pulleys 11 to 14 is provided on its outer circumference with a guide groove 19 extending radially and parallel to each other, and the cutting wire 17 is continuously guided in this guide groove during the cutting process. The spacing “A” between the individual guide grooves 19 is always the same dimension (see FIG. 4). Here, the cutting wire 17 is unwound from a dispenser spool (not shown) and guided in the direction of arrow 18.

Wire guide pulleys 11 and 12 which limit the transverse direction of cutting area 15 so that they are located opposite each other such that the spacing between associated guide grooves 19 is minimized.
Are arranged opposite to each other, and the cutting wire 17 is connected to the longitudinal axes 11a and 11a of the wire guide pulleys 11 and 12, respectively.
It crosses in a direction extending perpendicular to 2a. Wire guide pulleys 13 and 14 and their guide grooves 19
Are arranged in parallel with the wire guide pulleys 11 and 12 and the guide grooves 19, respectively.

An embodiment for forming the offset "V" will be described below with reference to FIGS. In order to clarify the gradual enlargement of the offset, only the wire guide pulley 12 shown in FIG.
9 'to 19''''', these references are also referred to in the description with respect to other wire guide pulleys.

As can be seen from FIG. 4, the offset "V" to be adjusted corresponds to four steps of the interval "A". In the illustrated embodiment, the cutting wire 17 coming from the wire guide pulley 11 is
9 ', from there to the wire guide pulley 13 and from there back to the adjacent guide groove 19''of the wire guide pulley 12 to form a quarter of the total offset,
Then, the individual parallel guide grooves 1 of the wire guide pulley 13
Reach 9 ''. There, it is guided to the guide groove 19 '' of the wire guide pulley 14, where the cutting wire 17 returns to the next guide groove 19 '''of the wire guide pulley 13 to obtain the next quarter of the offset. From there, it is guided again to the corresponding guide groove 19 ″ ′ of the wire guide pulley 14. Guide groove 19 '''of wire guide pulley 14
The cutting wire 17 reaches the next guide groove 19 "" of the wire guide pulley 11, from which it is returned to the associated guide groove 19 "" of the wire guide pulley 14, and subsequently the wire Guide groove 19 '''''of guide pulley 11
Returned to

Therefore, the total offset "V" formed in the cutting area 15 is, as apparent from FIG.
This corresponds to four steps of the interval. However, cutting area 1
5, two wire guide pulleys 11 and 12
There is no offset in the cutting wire 17 and the individual guide grooves 19 of these wire guide pulleys
Are positioned so as to directly oppose each other.

As mentioned above, the formation of the offset of the cutting wire 17 continues over the entire length of the wire guide pulleys 11 and 12, and as shown on the top of the cutting area 15 in FIG. , Individual wire guide pulley 11
And 12 perpendicularly to the direction of the individual longitudinal axes 11a and 12a of the cut-out area 15.

[Brief description of the drawings]

FIG. 1 is a side view showing a conventional wire saw.

FIG. 2 is a top view of the wire saw shown in FIG.

FIG. 3 is a side view showing a wire saw according to the present invention.

FIG. 4 is a top view of the wire saw shown in FIG. 3;

[Explanation of symbols]

1,2,3,4,11,12,13,14 wire guide pulley, 5,15 cutting area, 6,8,16,18 arrow, 7,17 cutting wire, 9 ... quartz glass cylinder,
11a, 12a: longitudinal axis, 19: guide groove, A: interval, V: offset.

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 592164085 QUARZSTRASSE, 63450 H ANAU, GERMANY (72) Inventor Norbert Treger Germany, 63452 Hanau, El Zbergerstrasse 8 (72) Inventor Stephan Kirchner Germany Federal Republic, 63512 Heinburg, Friedhofstrasse 36 (72) Inventor Armin Schneider Germany, 63589 Linsengericht, Eidengesesser Strasse 6

Claims (7)

[Claims] 1. In a cutting area defined laterally by two spaced wire guide pulleys each provided with a guide groove, the cutting area is traversed at several points having an offset corresponding to the saw cutting width. The sawing width is adjusted by guiding the cutting wire into the guide groove, supplying the semi-finished product to the cutting area, and sawing the semi-finished product into parallel surfaces by the cutting wire. In the method for manufacturing glass by drawing, at least a part of the offset “V” is formed outside the cutting region (15) without the cutting wire (17) crossing the cutting region (15). A method for producing glass by sawing. 2. At least one offset wire guide with an offset guide groove traversed by said cutting wire (17) to form at least a portion of said offset "V" to form said offset "V". Method according to claim 1, characterized in that a pulley (13; 14) is provided. 3. The method according to claim 2, wherein two offset wire guide pulleys are provided. 4. The semi-finished product of the glass is quartz glass.
A method according to any one of claims 1 to 3, characterized in that the method has been sawed from. 5. A wire saw comprising at least two wire guide pulleys defining a transverse direction of a cutting area,
Each of the wire guide pulleys has a guide groove extending around the outer circumference, in which the cutting wire is guided across the cutting area at several locations having an offset corresponding to the sawing width of the wire saw. In a wire saw, to form at least a portion of the offset "V",
A wire saw, characterized in that a wire guiding device (13, 14) is arranged outside the cutting area (15), through which the cutting wire (17) is guided without crossing the cutting area (15). 6. At least one offset wire guide pulley (13) having an offset guide groove as a wire guide device through which said cutting wire (17) is guided to form at least a part of said offset "V". 1
The wire saw according to claim 5, wherein 4) is provided. 7. The wire saw according to claim 6, wherein two offset wire guide pulleys (13, 14) are provided.