CN209999500U

CN209999500U - Scroll saw and spool thereof

Info

Publication number: CN209999500U
Application number: CN201821082437.4U
Authority: CN
Inventors: 迈克尔·西格里斯特
Original assignee: Precision Surfacing Solutions GmbH
Current assignee: Precision Surfacing Solutions GmbH
Priority date: 2017-07-07
Filing date: 2018-07-09
Publication date: 2020-01-31
Anticipated expiration: 2028-07-09
Also published as: CN109205384A; WO2019008530A1

Abstract

The present invention relates to a method of winding a cutting wire (10), preferably a fixed abrasive wire, preferably a diamond wire or a nanotube wire, in a plurality of coils on a reel (9), wherein the wire sections (11, 12,13,14, 15) of the cutting wire (10) form winding sections (1, 2,3,4, 5) extending along the reel axis (8) , characterized in that the coils of the wire sections (1, 2,3,4, 5) are reversed at least twice, preferably at least 4 times, in every of at least 2, preferably at least 10, more preferably at least 20, of the winding sections (1, 2,3,4, 5) in the direction of travel of the reel axis (8).

Description

Scroll saw and spool thereof

Technical Field

The present invention relates to a method of winding a cutting wire, preferably a fixed abrasive wire, preferably a diamond wire or a nanotube wire, in a plurality of coils on a spool, wherein the wire sections of the cutting wire form winding sections extending along the spool axis next to , preferably directly adjacent to each other, furthermore, the present invention relates to a method of performing a series of relative movements between a wire dispensing device and a spool and/or a spool holder along the spool axis and/or spool holder axis.

Background

As used in this document, "sharpening" refers to any action that improves or enhances the cutting performance/action of the cutting wire.

The utility model particularly relates to a fixed abrasive sawing technique. Nowadays, fixed abrasives are increasingly used for cutting wafers for semiconductor applications, solar cells or LEDs. The abrasive is no longer suspended in the slurry delivered by the wire to effect cutting. The abrasive is directly attached to the wire. Such wire is called a fixed abrasive wire (e.g., diamond wire).

These sawing techniques are used in the semiconductor, electronic, photovoltaic, optical and photonic industries. Typical (hard and/or brittle) materials for sawing are GaAs, germanium, polycrystalline or single or quasi-single crystal silicon, InP, quartz, sapphire or other ceramic materials.

Typically, the wire guide rollers of wire saws are polyurethane coated and have grooves on the wire receiving surface for guiding the cut wire diamond wire is meshed over the wire guide rollers in these grooves the pitch of the grooves (i.e., the distance the groove pattern repeats itself) and the wire diameter used will determine the thickness of the wafer being sawn.

The cost of the fixed abrasive slicing process can be significantly reduced if the fixed abrasive wire can be continuously used for continuous cutting even if a portion of the wire web has been used in a previous cut (provided that the remaining sawing capacity of the used wire is not reduced too much). The sawing capacity can be measured by the wire deflection (bending of the wire) during the process. A wire that loses sawing potential will deflect more (with higher bending) than a new, unused wire.

The wire moves back and forth as in a conventional hand saw . typically the spool that cuts forward (the wire moves from the supply spool to the receiving (or disposable) spool) is slightly longer than the opposite direction, this is the so-called pilgrim mode.

The cutting wire is placed in the wire saw before starting the cutting process. Prior art document CH691292a5 shows a wire saw with a wire management system in fig. 1, and the wire saw is ready for cutting. For the pilgrist movement, the cut wire is detached from the supply reel, passed through the cutting area to form a wire web, and then wound onto a take-up reel (disposable reel). Generally, a supply reel, a receiving reel, and a wire guide roller forming a wire web are driven.

The wire travels e.g. 500- & lt600 & gt in directions, i.e. an additional 500- & lt600 & gt meters is unloaded from the supply spool and wound onto the receiving spool compared to the starting point, but only e.g. 490-590 meters is wound from the receiving spool back onto the supply spool in this way new wire is fed into the wire web when the cut wire portion no longer reaches the work piece to be cut (i.e. more cut wire is fed behind this portion, so that when the wire moves back, this portion can no longer reach the work piece), the wire should be exhausted, the diamond on the cut wire is ground or detached from the wire.

The following problems exist in the prior art: the sharpness of the cut wire decreases with time, resulting in a decrease in cutting performance. As a result, the cutting wire must be frequently replaced. The wear of the diamond or abrasive particles due to the space between the particles being filled may impair sharpness.

In addition, the portion of the cutting wire which has been used for cutting and which now has to be pulled back through the cutting zone is not cut well. In particular, the sharpness of such used cutting wire portions should be increased.

WO2016/203303 a1 discloses a method for cutting a workpiece on a wire saw comprising a cutting wire which travels around at least two wire guide rollers, thereby forming a wire web for cutting the workpiece, the cutting wire can be sharpened by temporarily transferring a wire portion of the wire web to a spool WO2016/203303 a1 proposes that the windings of the wire portion on the spool overlap with other windings in order to achieve the sharpening effect.

WO 2014/087340a2 discloses a wire management system for a wire saw of the kind , which wire saw comprises a rotatable storage reel for carrying at least portions of the cutting wire with overlapping windings, and a rotatable storage reel for temporarily receiving portions of the cutting wire with windings.

SUMMERY OF THE UTILITY MODEL

The performance of the cutting wire can be extended relative to the prior art (particularly for large wafer cuts using a single wire, and the time required for penetrations.) the sharpness of the cutting wire can be maintained at an acceptable level after multiple cuts.

The above object is achieved by the method mentioned at the beginning, wherein in every of at least two, preferably at least 10, more preferably at least 20 winding sections the coils of the wire section are reversed in the direction of travel of the reel axis at least twice, preferably at least 4 times.

In other words, the wire travel direction is the direction of the coil (i.e., full turns around the spool) followed by the first coil, or the direction of the coil to the lower coil, "reverse" indicates that the coil travel direction is changed from a th direction parallel to the spool axis to a second direction parallel to the spool axis, or vice versa, wherein the second direction is opposite to the th direction.

The inventive idea is based on repeated reversal of the coil travel direction (i.e. the direction in which the coils of the wire section travel and are arranged along the reel axis (i.e. in a direction parallel to the reel axis)) in winding sections running through series reversal the sharpening effect of (abrasive) cutting the wire can be improved compared to, for example, WO2016/203303 a1, the wire can be sharpened more uniformly, enabling better cutting.

Furthermore, so many cutting wires can be arranged on the storage spool that multiple cuts can be made using only this wire section, while the desired sharpening effect is always achieved. Furthermore, the cutting wire is used and sharpened in use, which may make the entire cutting wire more uniformly used.

The wire sections forming the winding sections (with at least two reversals of the coil travel direction) are portions of a single (i.e. continuous) cut wire, i.e. all wire sections assigned to a winding section according to the inventive winding pattern belong to the same cut wire.

The distribution sequence of successive coils has a meandering pattern due to the (at least two) reversals. The meander pattern may be repeated in each winding section.

Preferably, the winding sections according to the inventive winding pattern cover reel portions of substantially the same length.

Preferably, the length of each winding section is less than 10% of the length of the spool and/or less than 2cm, wherein the wire sections are provided with at least two reversals of the coil travel direction in the winding sections.

Preferably, the wire sections are provided with a number of winding sections with a coil travel direction reversed at least twice of up to at least 10, preferably at least 20, more preferably at least 50.

Preferably, the length of the winding sections, in which the wire sections are provided with at least two reversals of the coil travel direction, amounts to more than 50%, preferably more than 80%, of the length of the winding shaft.

Preferably, the winding sections, in which the wire sections are provided with at least two reversals of the direction of travel of the coils, are adjacent to each other, so that the reel is evenly covered by the cutting wire (i.e. without intermediate spacing exceeding the wire diameter).

The winding method according to the invention can be performed before, during and/or after cutting the workpiece, for example in a wire saw. The wire portion may be removed from the cutting area and moved to a sharpening reel where it will be wound in accordance with the innovative manner.

In a preferred embodiment, the wire sections are wound in at least three, preferably at least five overlapping layers in at least winding sections, preferably in each winding section.

Preferably, in at least winding sections, preferably in each winding section, the innermost layer of the wire section is in contact with the surface of the reel here a uniform sharpening effect can be achieved along the cutting wire alternatively the cutting wire can of course be arranged on the wire layer(s) ( or more) already wound on the reel according to an innovative way.

In a preferred embodiment, the cutting wire is wound onto the spool in such a way that the total number of reversals in the direction of travel of the coils along the axis of the spool (i.e. the direction of travel of the coils of the wire section along the axis of the spool) amounts to at least 50, preferably at least 100, more preferably at least 500. The greater the total number of reversals, the greater the sharpening efficiency.

Preferably, the number of coils of a wire section between consecutive direction reversal points in at least winding sections, preferably in each winding section, amounts to at least 3, preferably at least 5, more preferably at least 10, and/or up to 150, preferably up to 100, more preferably up to 50, the total number of reversals in the direction of coil travel along the axis of the reel has an effect on the sharpening effect.

In a preferred embodiment, consecutive (preferably adjacent) wire sections of the cutting wire are assigned to consecutive (preferably adjacent) winding sections. Here, the arrangement sequence has a regular or periodic pattern along the reel axis. The cutting wire can be sharpened uniformly.

In a preferred embodiment, winding of the cutting wire on the reel is performed by a wire dispensing device, preferably a pulley or a guide, wherein the reel and the wire dispensing device are movable relative to each other in the direction of the reel axis.

This object is also achieved by method of making series of relative movements between a wire dispensing device, preferably a wire saw and a spool and/or spool holder, along a spool axis and/or spool holder axis, the method preferably being performed in a wire saw and preferably during the method according to any of the of the preceding claims, the wire dispensing device preferably being a pulley or a guide, wherein the wire dispensing device is associated with the spool and/or spool holder, comprising the steps of (1) reciprocating the wire dispensing device along the spool axis and/or spool holder axis with respect to the spool and/or spool holder by a spool portion distance which is smaller than the length of the spool or spool holder, preferably by a spool portion distance which is smaller than or equal to 1/5, more preferably smaller than or equal to 1/10 of the length of the spool or spool holder, and (2) repeating step (1) at different positions along the spool axis, preferably by at least 2 times, more preferably by at least 5 times.

With the above method, at least two reversals of the direction of travel of the coil can be achieved in each winding section. With the above method, (1) the wire sections of the cutting wire can be wound into winding sections with at least two reversals of the coil running direction, (2) different wire sections of the cutting wire can be assigned to different winding sections.

For the utility model discloses, wire rod distributor is cutting wire rod distributor, specifically is for being used for fixed abrasive material cutting wire rod, preferably diamond wire rod or nanotube wire rod. Specifically, the cutting wire is made of a metal core wire fixed with an abrasive.

The wire dispensing device is connected to the controller of the wire saw or reel winder and performs the necessary movements to create the innovative winding pattern according to a predetermined program in the controller.

Preferably, the length of the winding section in which the wire section is provided with at least two reversals of the direction of travel of the coil amounts to more than 50%, preferably more than 80%, of the length of the spool or spool holder, for example substantially the entire length of the spool or spool holder.

Preferably, step (1) is repeated for adjacent winding sections along the spool or spool holder such that the winding sections cover adjacent extents of the spool or spool holder.

Preferably, the reciprocating movement includes at least a movement in the th direction, a movement in a second (i.e., opposite) direction, and a movement again in the th direction.

This object is also achieved by a method of relative movement between a wire dispensing device, preferably a pulley or a guide, and a spool and/or a spool holder along a spool axis and/or a spool holder axis for winding a cutting wire on a spool, preferably within a wire saw and preferably performed during a method according to the invention or embodiments thereof, wherein the wire dispensing device is associated with the spool and/or spool holder, the method comprising the step of moving the wire dispensing device along the spool axis and/or spool holder axis with respect to the spool and/or spool holder at a speed such that during the time of complete coils of cutting wire being wound on the spool, the distance the wire dispensing device is moved along the spool axis and/or spool holder axis is smaller than the diameter of the cutting wire, preferably less than 5/6, more preferably less than 2/3, most preferably substantially less than 1/2 the diameter of the cutting wire.

Since the distance that the dispensing device moves when winding coils on the spool is less than the wire diameter, the portion of the wire currently reaching the spool temporarily makes overlapping contact with the front coil and then slides (or slips) from the overlapping position to a position where the coil is at the same height as the front coil and forms an adjacent coil, the cut wire wound on the spool moves forward due to the sliding of the cut wire over the front coil, i.e., beyond the wire dispensing device after number of coils are arranged on the spool, the force acting in the backward direction on the currently wound portion of the cut wire (which moves forward relative to the wire dispensing device) becomes very large.

It is believed that the sliding (slipping) process further increases the sharpening effect of the cutting wire.

Unlike the embodiment in which the dispensing device changes its direction of movement to cause reversal of the winding direction, in this embodiment reversal of the winding direction is achieved by setting the constant speed of the dispensing device along the axis of the reel (relative to the speed of rotation of the reel), which can be defined as follows:

the speed of movement of the wire dispensing device along the spool axis and/or the spool holder axis is given by the ratio of the two,

a distance less than the diameter of the cutting wire, preferably less than 5/6 of the diameter of the cutting wire, more preferably less than 2/3 of the diameter of the cutting wire, most preferably substantially less than 1/2 of the diameter of the cutting wire, and

the time required to wind complete coils of cut wire on a reel.

In a preferred embodiment the speed of movement of the wire dispensing device along the spool axis and/or the spool holder axis is such that the distance the wire dispensing device is moved along the spool axis and/or the spool holder axis is greater than 1/6, more preferably greater than 1/3, most preferably substantially greater than 1/2, the diameter of the cutting wire during the time when complete coils of cutting wire are wound on the spool.

In a preferred embodiment, the speed of movement and/or the direction of movement of the wire dispensing device along the spool axis and/or the spool holder axis is kept constant during a time interval in which at least 50, preferably at least 100, more preferably at least 1000 coils are wound on the spool.

The control of the dispensing device becomes very simple, since the speed of movement and/or the direction of movement does not need to be changed for each direction. The same is true for the latter embodiment.

In a preferred embodiment, the speed of movement and/or the direction of movement of the wire dispensing device along the spool axis and/or the spool holder axis is kept constant during a time interval of at least 5, preferably at least 10, more preferably at least 100 reversals of the direction of travel of the coil of the wire section along the spool axis.

This object is also achieved by a method for sharpening a cutting wire, characterized in that the cutting wire is temporarily wound on a reel in a plurality of coils by the method according to the invention the sharpening may be performed before, during or after the cutting.

This object is also achieved by a method of for cutting pieces of material, in particular for slicing, squaring and/or squaring pieces of material, such as hard brittle and/or semi-conducting material, with a wire saw comprising a cutting wire which is preferably advanced around at least two guide rollers in a plurality of coils to form a cutting zone, preferably a wire web, for cutting pieces of material, the method comprising the steps of:

(a) moving the cut wire of the cutting area in number of reciprocating cycles by alternately rotating the wire guide rollers in opposite directions;

(b) after or during step (a), the portion of the cutting wire is transferred from the wire guide roller to the spool by rotating the wire guide roller and the spool, whereby the portion of the cutting wire is wound on the spool by the method according to the invention.

The method describes the possibility of performing the sharpening step, i.e. the winding method performed directly within the wire saw by providing a reversal of the direction of travel of the coil in the wire section. No wire needs to be removed from the wire saw. Nor is there any need to interrupt the cutting process.

Preferably, the method comprises the steps of:

(c) after step (b), transferring the portion of the cut wire from the spool to the wire guide roller by rotating the wire guide roller and the spool;

(d) after or during step (c), the cut wire forming the cutting zone is moved in number of reciprocating cycles by alternately rotating the wire guide rollers in opposite directions.

This embodiment describes the possibility of reusing the wire portion after sharpening.

The cutting area may be formed by a single (only ) wire section or by a plurality of parallel wire sections (also called wire mesh).

The innovative method can be used on the th side of the cutting area (also called new wire side), on the second (opposite) side of the cutting area (also called old wire side), or on both sides simultaneously, or alternatively on both sides.

Preferably, at least of steps (a) to (d) are repeated at least 2 times, preferably at least 5 times, more preferably at least 10 times before the next steps are performed, and/or wherein steps (b) to (d) are repeated after step (d), preferably at least 1 time, preferably at least 2 times, more preferably at least 4 times.

The utility model discloses an advantages are need not break off the cutting process that produces the high quality incision, sharpen cutting wire rod once more through coiling cutting wire rod temporarily on the sharpening spool simultaneously.

This object is also achieved by a (sharpened) reel of kinds, preferably a reel of fixed abrasive wire, preferably diamond wire or nanotube wire, in a plurality of coils on the reel, wherein the wire sections of the cutting wire form successive winding sections extending along the reel axis , characterized in that within each of at least 2, preferably at least 10, more preferably at least 20, of the winding sections the coils of the wire sections are reversed at least twice, preferably at least 4 times, in the direction of travel of the reel axis.

The winding or wire segments running can run directly next to one another.

Preferably, the wire sections are wound in at least three, preferably at least five overlapping layers within at least of the winding sections, preferably within each of the winding sections, and/or wherein the innermost layer of the wire sections is in contact with the spool surface within at least of the winding sections, preferably within each of the winding sections.

The layer may be a wire extending between two successive reversals of the direction of travel of the coil.

Preferably, the number of coils of the wire section between successive direction reversal points reaches at least 3, preferably at least 5, more preferably at least 10, and/or reaches at most 150, preferably at most 100, more preferably at most 50, within at least of the winding sections, preferably within every of the winding sections.

Preferably, consecutive, preferably adjacent, wire sections of the cutting wire are assigned to consecutive, preferably adjacent, winding sections.

Further preferred features of the inventive reel have been described above with reference to the winding method. These features can of course be applied equally to the reel.

This object is also achieved by a wire saw of the kind for cutting pieces of material, in particular for slicing, squaring and/or squaring pieces of material, such as hard brittle and/or semi-conducting material, comprising at least two guide rollers, a cutting wire running in a plurality of coils around the at least two guide rollers to form a wire web for cutting pieces of material, and at least rotatable reels for temporarily receiving at least parts of the cutting wire, characterized in that the reel with the cutting wire is a reel with the cutting wire according to the invention, wherein preferably the reel is mounted adjacent to a further reel holding the cutting wire in a plurality of windings, it is known from WO 2014/087340a2 to mount the reel next to a further reel holding the cutting wire in a multilayer winding, which publication is also incorporated by reference and constitutes an integral part of the present application.

Preferably, the wire saw comprises a controller for controlling the cutting process, wherein the wire saw is adapted to perform the method according to the invention.

Drawings

The invention will now be explained in detail by means of the accompanying drawings, in which:

figure 1 shows a reel onto which a cutting wire is wound according to the innovative winding manner,

figure 2 shows a wire saw which is shown,

figure 3 shows a method for winding a cutting wire to a reel according to the innovative winding method,

figure 4 shows an embodiment of the winding pattern,

figure 5 shows a wire section of a cutting wire,

figure 6 shows an embodiment of the winding pattern,

figure 7 shows an enlarged view of a method for obtaining the winding pattern according to figure 6,

fig. 8 shows the portion of the wire currently reaching the spool and temporarily making overlapping contact with the front coil.

Detailed Description

Fig. 1 shows a reel 9 on which a cutting wire 10 is wound according to a winding manner. The cutting wire 10 may be a fixed abrasive wire, preferably a diamond wire or a nano-wire. Thus, fig. 1 also shows a method of winding the cutting wire 10 in a plurality of coils 6 on the reel 9. The coils 6 of cutting wire 10 are arranged on the reel 9 in a sequence defined by the reversal of the coil travel direction 7 (see the line incorporating the arrow).

As can be seen from fig. 1, the winding pattern comprises winding

sections

1,2,3,4,5 extending by 8 along the reel axis the winding

sections

1,2,3,4,5 are formed by

wire sections

11,12,13,14,15 of the cut wire 10, the

wire sections

11,12,13,14,15 are part of a single, i.e. continuous, cut wire 10, .

The coils 6 of the

wire sections

1,2,3,4,5 are reversed twice along the direction 7 of travel of the spool axis 8 within every winding

sections

1,2,3,4,5, for example at reversal points R1 and R2.

As seen in a cross section along the longitudinal axis of the winding shaft 8, the coil travel direction 7 extends meandering within the winding section.

According to the embodiment of fig. 1, in every winding

sections

1,2,3,4,5, the

wire sections

11,12,13,14,15 are wound in three (five according to fig. 4) overlapping layers 21,22,23 the coils arranged above each other touch each other the innermost layer 21 of the

wire sections

11,12,13,14,15 is in surface contact with the winding shaft.

For clarity, five winding sections are shown in fig. 1. However, the number of winding sections in which the wire sections are arranged with at least two reversals of the coil travel direction preferably amounts to at least 10, preferably to at least 20, more preferably to at least 50.

Preferably, the number of coils 6 of the

wire sections

11,12,13,14,15 between successive reversal points of the direction amounts to at least 3, preferably to at least 5, more preferably to at least 10, and/or to at most 150, preferably to at most 100, more preferably to at most 50, in at least of the winding

sections

1,2,3,4,5 and preferably in each of the winding

sections

1,2,3,4, 5.

According to the embodiment of fig. 1, consecutive (here adjacent)

sections

11,12,13,14,15 (see fig. 5) of the cutting wire 10 are assigned to consecutive (here adjacent) winding

sections

1,2,3,4,5 it is noted that different winding orders are possible, adjacent spool portions do not need to be wound by , for example, spool portions may be (periodically) skipped and wound later in the winding process, in which case adjacent winding sections are not wound by .

Fig. 3 shows that the winding of the cutting wire 10 on the reel 9 can be done by means of a wire dispensing device 16, preferably a pulley (as shown in fig. 3) or a guide, wherein the wire dispensing device 16 is associated with the reel 9 and/or a reel holder for holding the reel 9. the reel 9 and the wire dispensing device 16 are movable relative to each other in the direction of the reel axis 8. in this embodiment, the wire dispensing device 16 (in the form of a rotatable pulley) is movable in a direction parallel to the reel axis 8. to achieve the winding pattern shown in fig. 1, the wire dispensing device 16 is moved as indicated by the reciprocating arrow in fig. 3. the reel 9 and the wire dispensing device 16 can be part of a wire saw 20 as shown in fig. 2.

A method of carrying out-preferably within the wire saw 20 and preferably during the above-described method-a series of relative movements (see arrows in fig. 3) between the wire dispensing device 16 and the reel 9 and/or the reel holder (as shown in fig. 3) along the reel axis 8 and/or the reel holder axis comprises the following steps:

(1) holding the wire dispensing device 16 back and forth along the spool axis 8 and/or spool holder axis relative to the spool 9 and/or spool a spool portion distance, wherein the spool portion distance is less than, preferably less than or equal to 1/5, more preferably less than or equal to 1/10, of the length of the spool 9 or spool holder, and

(2) repeating step (1) at different positions along the spool axis 8, preferably at least 2 times, more preferably at least 5 times. Step (1) is repeated in correspondence with the number of winding sections whose coil travel direction has at least two reversals.

The method according to the invention can be used in particular for sharpening a cutting wire 10, wherein the cutting wire 10 is temporarily wound on the reel 9 in a plurality of coils 6 according to the winding method described above.

Fig. 2 shows a wire saw 20 comprising a cutting wire 10, wherein the cutting wire 10 extends around at least two

wire guiding rollers

18, 19, preferably in the form of a plurality of coils, forming a cutting area in the form of a wire web for cutting pieces of material 17.

The cutting method comprises the following steps:

(a) the cut wire 10 forming the wire web is moved in number of reciprocating cycles by alternately rotating the

wire guide rollers

18, 19 in opposite directions (also referred to as pilgrims mode);

(b) after or during step (a), the portion of the cut wire 10 is transferred from the

wire guide rollers

18, 19 to the spool 9 by rotating the

wire guide rollers

18, 19 and the spool 9, thereby winding the portion of the cut wire 10 onto the spool 9 according to the inventive winding manner.

As can be observed from fig. 2, the cutting wire 10 can be wound (sharpened) onto the reel 9 in both directions. Thus, the wire saw 10 may also comprise two reels 9 with associated wire dispensing devices 16.

The cutting method preferably further comprises the steps of:

(c) after step (b), transferring the portion of the cut wire 10 from the spool 9 to the

wire guide rollers

18, 19 by rotating the

wire guide rollers

18, 19 and the spool 9;

(d) after or during step (c), the cut wires 10 forming the wire web are moved in number of reciprocating cycles by alternately rotating the

wire guide rollers

18, 19 in opposite directions.

At least of steps (a) to (d) may be repeated at least 2 times, preferably at least 5 times, more preferably at least 10 times before carrying out the subsequent steps (b) to (d) may be repeated, preferably at least times, preferably at least 2 times, more preferably at least 4 times, after step (d).

The wire saw 20 comprises at least two

wire guide rollers

18 and 19, a cutting wire 10 and at least rotatable reels 9, wherein the cutting wire 10 extends in a plurality of coils around the at least two

wire guide rollers

18, 19 to form a wire web for cutting pieces of material 17, and the reels 9 are used for temporarily receiving and sharpening at least portions of the cutting wire 10.

The reel 9 may be mounted in close proximity to other reels (not shown) holding the cutting wire in a plurality of windings.

Fig. 2 also shows that wire saw 20 may include a controller 24 for controlling the cutting process, wherein wire saw 20 is adapted to perform of the above-described method.

Fig. 6 shows an embodiment of the inventive winding pattern, where the pattern of the winding sections is different from the method shown in fig. 3, in fig. 6 only the cross-section of the coil on the side of the reel 9 is shown, the numbers in the cross-section indicate the order in which the coil is wound on the winding 9.

The coils "1" to "13" are located directly on the surface of the spool and the direction of coil travel is from left to right. Thereafter, the coil "14" reverses the direction of coil travel. The coil "14" is already on top of the layer 21. Thereafter, coils "15" and "16" travel in opposite directions, i.e., from right to left. After coil "16", the coil travel direction is reversed again; coil "17" is located on layer 21. It is also possible to first place an intermediate coil (which is indicated by a dashed line). After coil "17", coils "18" and "19" (which partially overlap layer 21) travel from left to right. The winding section 1 is constructed in this way.

After coil "19", the process is repeated for successive winding sections 2 and preferably further winding sections etc.

ways of achieving this configuration are as follows (see also fig. 7 and 8):

according to fig. 7, the method comprises performing a relative movement between a wire dispensing device 16 (preferably a pulley or guide) and a spool 9 and/or a spool holder along a spool axis 8 and/or a spool holder axis for winding a wire 10 on the spool 9 the wire dispensing device 16 is associated with the spool 9 and/or the spool holder, the method comprises the step of moving the wire dispensing device 16 along the spool axis 8 and/or the spool holder axis relative to the spool 9 and/or the spool holder at such a speed that the wire dispensing device 16 is moved along the spool axis 8 and/or the spool holder axis for a distance which is less than the diameter of the cut wire 10, preferably less than 5/6 of the diameter of the cut wire 10, more preferably less than 2/3 of the diameter of the cut wire 10, most preferably less than almost 1/2 of the diameter of the cut wire 10, within the time that complete coils of the wire 10 are wound on the spool 9.

Since the dispensing device 16 moves a distance less than the wire diameter when coils are wound on the spool 9, the portion of wire currently reaching the spool 9 temporarily contacts the front coil (see fig. 8) in an overlapping manner and then slips or slides (see arrow in fig. 8) from the overlapping position to the same height as the front coil and forms an adjacent coil, the cut wire 10 wound on the spool 9 travels forward, i.e., beyond the wire dispensing device 16 (see fig. 7), due to the slipping off of the cut wire 10 on the front coil.

After a certain number of coils are arranged on the reel 9, the force acting in the backward direction on the currently wound portion of cut wire (which moves forward relative to the dispensing device) becomes great-this force will cause the direction of travel of the coils (of the wire section) along the reel axis (see the successive coils in fig. 6) to be reversed.

More preferably, the speed of movement of the dispensing device 16 is kept constant during the time interval in which a plurality of such reversals occur.

Preferably, the speed of movement of the wire dispensing device 16 along the spool axis 8 and/or the spool holder axis is set such that the distance the wire dispensing device 16 moves along the spool axis 8 and/or the spool holder axis is preferably greater than 1/6, more preferably greater than 1/3, most preferably greater than almost 1/2 of the diameter of the cut wire 10, during the time that complete coils of the cut wire 10 are wound on the spool 9.

Preferably, the speed of movement and/or the direction of movement of the wire dispensing device 16 along the reel axis 8 and/or the reel holder axis is kept constant during a time interval in which at least 50, preferably at least 100, more preferably at least 1000 coils are wound on the reel 9 and/or during a time interval in which at least 5, preferably at least 10, more preferably at least 100, reversals of the direction of travel of the coils of the wire section along the reel axis.

In other words, the speed of the wire dispensing device 16 (see FIG. 7) relative to the rotational speed of the spool 9 is set so that the coil is initially on the spool 9 at a distance less than the wire diameter, i.e., the portion of wire reaching the spool temporarily overlaps the front coil, after which the coil simply slides from the front coil onto the spool 9. in FIG. 6, after wire "13", the force pulling wire 10 to the left becomes large and coil "14" is already on top of layer 21, so that the direction of coil travel for the wire section reverses direction times.

The wire travels a large distance from position "13" to position "14" (in fig. 6, about 8 wire diameters in half a winding). When coil "15" is placed, it is guided through the half winding and is located to the left of coil 14. This continues until the correction force to the right becomes so great that the winding is no longer forced by the half winding in place. Now in position "17" or sometimes in an intermediate position (dashed position) to change the direction of travel of the coils of the wire section a second time.

As the wire dispensing device 16 continues to move to the right, the coils "18" and "19" are placed. The initial conditions are now satisfied again: the wire dispensing device 16 is located directly above the wire position "1". This sequence is repeated for wire windings "1" to "19" (not all visible) in winding section 2.

The present invention is not limited to these embodiments. Other variants will be apparent to those skilled in the art and are considered to fall within the scope of the invention as defined by the following claims. The individual features described in all the parts of the above description, in particular in relation to the figures, can be combined with each other to form further embodiments and/or be applied, mutatis mutandis, to what is described in the claims and in the rest of the description (even if these features are described in relation to or in combination with other features).

List of reference numerals

1,2,3,4,5 winding sections

6 coil

7 direction of travel of coil

8 axis of reel

9 reel

10 cutting wire

11,12,13,14,15 wire sections

16 wire distributing device

17 pieces of material

18 wire rod guide roller

19 wire rod guide roller

20 wire saw

21,22,23 layers

24 controller

Reverse point of R1 and R2

Claims

Reel (9) with a cutting wire (10), the cutting wire (10) being on the reel (9) in a plurality of coils (6), wherein wire sections (11, 12,13,14, 15) of the cutting wire (10) form winding sections (1, 2,3,4, 5) extending along a reel axis (8) after , characterized in that within each of at least 2 of the winding sections (1, 2,3,4, 5) the coils (6) of a wire section (1, 2,3,4, 5) are reversed at least twice along a direction (7) in which the reel axis (8) runs.
2. Spool according to claim 1, wherein the wire sections (11, 12,13,14, 15) are wound in at least three overlapping layers (21, 22, 23) within at least of the winding sections (1, 2,3,4, 5) and/or wherein the innermost layer (21) of the wire sections (11, 12,13,14, 15) is in contact with the surface of the spool within at least of the winding sections (1, 2,3,4, 5).
3. Spool according to claim 1 or 2, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) amounts to at least 3 and/or to at most 150 between consecutive direction reversal points (R1, R2) within at least of the winding sections (1, 2,3,4, 5).
4. A spool according to claim 1 or 2, wherein successive wire sections (11, 12,13,14, 15) of the cutting wire (10) are assigned to successive winding sections (1, 2,3,4, 5) and/or wherein the wire sections (11, 12,13,14, 15) are provided with a number of winding sections (1, 2,3,4, 5) of at least two reversals of the coil travel direction (7) of up to at least 10.
5. A reel according to claim 1, wherein within each of at least 10 of the winding sections (1, 2,3,4, 5) the coils (6) of a wire section (1, 2,3,4, 5) are reversed at least twice along the direction of travel (7) of the reel axis (8).
6. A spool according to claim 5 wherein within each of at least 10 of the winding sections (1, 2,3,4, 5) the coils (6) of a wire section (1, 2,3,4, 5) are reversed at least 4 times in the direction of travel (7) of the spool axis (8).
7. A spool according to claim 1 wherein within each of at least 20 of the winding sections (1, 2,3,4, 5) the coils (6) of a wire section (1, 2,3,4, 5) are reversed at least twice along the direction of travel (7) of the spool axis (8).
8. A spool according to claim 7 wherein within each of at least 20 of the winding sections (1, 2,3,4, 5) the coils (6) of a wire section (1, 2,3,4, 5) are reversed at least 4 times in the direction of travel (7) of the spool axis (8).
9. A reel according to claim 1, wherein within each of at least 2 of the winding sections (1, 2,3,4, 5) the coils (6) of a wire section (1, 2,3,4, 5) are reversed at least 4 times in the direction of travel (7) of the reel axis (8).
10. A spool according to claim 1, wherein the cutting wire (10) is a fixed abrasive wire.
11. A spool according to claim 10, wherein the cutting wire (10) is a diamond wire or a nanotube wire.
12. A spool according to claim 2, wherein the wire sections (11, 12,13,14, 15) are wound in at least five overlapping layers (21, 22, 23) within at least of the winding sections (1, 2,3,4, 5).
13. A spool according to claim 2, wherein within each of the winding sections (1, 2,3,4, 5) the wire sections (11, 12,13,14, 15) are wound in at least three overlapping layers (21, 22, 23).
14. A spool according to claim 13, wherein within each of the winding sections (1, 2,3,4, 5) the wire sections (11, 12,13,14, 15) are wound into at least five overlapping layers (21, 22, 23).
15. A reeling shaft according to claim 2, wherein, within each of the winding sections (1, 2,3,4, 5), the innermost layer (21) of the wire sections (11, 12,13,14, 15) is in contact with the surface of the reeling shaft.
16. A spool according to claim 3, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at least 5 between consecutive direction reversal points (R1, R2) within at least of the winding sections (1, 2,3,4, 5).
17. Spool according to claim 16, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) amounts to at least 10 between consecutive direction reversal points (R1, R2) within at least of the winding sections (1, 2,3,4, 5).
18. A spool according to claim 3, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at least 3 between successive direction reversal points (R1, R2) within each of the winding sections (1, 2,3,4, 5).
19. Spool according to claim 18, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at least 5 between consecutive direction reversal points (R1, R2) within each of the winding sections (1, 2,3,4, 5).
20. Spool according to claim 19, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at least 10 between consecutive direction reversal points (R1, R2) within each of the winding sections (1, 2,3,4, 5).
21. A spool according to claim 3, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at most 100 between successive direction reversal points (R1, R2) within at least of the winding sections (1, 2,3,4, 5).
22. Spool according to claim 21, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) between consecutive direction reversal points (R1, R2) amounts to at most 50 within at least of the winding sections (1, 2,3,4, 5).
23. A spool according to claim 3, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at most 150 between successive direction reversal points (R1, R2) within each of the winding sections (1, 2,3,4, 5).
24. A spool according to claim 23, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at most 100 between successive direction reversal points (R1, R2) within each of the winding sections (1, 2,3,4, 5).
25. A spool according to claim 24, wherein the number of coils (6) of the wire sections (11, 12,13,14, 15) reaches at most 50 between successive direction reversal points (R1, R2) within each of the winding sections (1, 2,3,4, 5).
26. A spool according to claim 4, wherein adjacent wire sections (11, 12,13,14, 15) of the cutting wire (10) are assigned to adjacent winding sections (1, 2,3,4, 5).
27. A spool according to claim 4, wherein the wire sections (11, 12,13,14, 15) are provided with up to at least 20 winding sections (1, 2,3,4, 5) with at least two reversals of the coil travel direction (7).
28. A spool according to claim 27, wherein the wire sections (11, 12,13,14, 15) are provided with up to at least 50 number of winding sections (1, 2,3,4, 5) having at least two reversals of the coil travel direction (7).
Wire saw (20) for cutting pieces of material (17), comprising at least two guide rollers (18, 19), a cutting wire (10) travelling around the at least two guide rollers (18, 19) in a plurality of coils to form a wire web for cutting pieces of material (17), and at least rotatable reels (9) for temporarily receiving at least parts of the cutting wire (10), characterized in that the reel (9) with the cutting wire (10) is a reel (9) with the cutting wire (10) according to any of claims 1-28.
30. Wire saw according to claim 29, wherein the spool (9) is mounted adjacent to another spool holding the cutting wire in a plurality of windings.
31. The wire saw as claimed in claim 29, wherein the wire saw (20) comprises a controller (24) for controlling the cutting process.