WO2020218338A1

WO2020218338A1 - Capstan roll and wire drawing machine

Info

Publication number: WO2020218338A1
Application number: PCT/JP2020/017337
Authority: WO
Inventors: 小林　一樹; 邦宏山部
Original assignee: 京セラ株式会社
Priority date: 2019-04-25
Filing date: 2020-04-22
Publication date: 2020-10-29
Also published as: JP7204901B2; JPWO2020218338A1

Abstract

This capstan roll is provided with: a metal core comprising an annular body having in the center section thereof a through-hole through which a rotary shaft penetrates, the metal core being provided with a key groove in the inner peripheral surface of the annular body; and a ceramic outer roll attached to the outer peripheral surface of the metal core. Recess sections that face each other and have a lock pin insertion hole section formed therein are formed on the outer peripheral surface of the metal core and on the inner peripheral surface of the ceramic outer roll, and the lock pin insertion hole section is positioned deviated from a region that radially extends from the axial center of the rotary shaft and covers the key groove of the metal core.

Description

Capstan roll and wire drawing machine

This disclosure relates to a capstan roll and a wire drawing machine using the capstan roll.

A thin wire having a wire diameter of about 15 to 50 μm is used as a bonding wire for a semiconductor device that electrically bonds an electrode on a semiconductor element and an external lead. Wires such as bonding wires are manufactured by a wire drawing machine equipped with a capstan roll.

In Patent Document 1, a ceramic outer roll is provided on the outer peripheral side of the metal core which is the core, and a lock pin (round bar) is embedded in a groove provided on the outer peripheral surface of the metal core and the inner peripheral surface of the ceramic outer roll. A capstan roll that is fixed with is disclosed to prevent rotation.

The metal core body has a through hole in the center, and the rotation shaft is inserted through the through hole. At this time, since it is necessary to prevent the metal core from rotating with respect to the rotating shaft, key grooves are provided on the outer peripheral surface of the rotating shaft and the inner peripheral surface of the metal core, respectively, and the key is fitted in the key grooves. Is being done.

Japanese Unexamined Patent Publication No. 5-115916

The capstan roll of the present disclosure is composed of an annular body having a through hole through which a rotation shaft is inserted in a central portion, and is formed on a metal core body having a key groove on the inner peripheral surface of the annular body and an outer peripheral surface of the metal core body. It comprises a ceramic outer roll to be mounted. The outer peripheral surface of the metal core and the inner peripheral surface of the ceramic outer roll are respectively formed with recesses facing each other to form a hole for inserting a lock pin, and the hole for inserting a lock pin is a rotating shaft. It extends radially from the axis of the metal core and is located outside the region covering the keyway of the metal core.
The wire drawing machine of the present disclosure includes the above-mentioned capstan roll.

It is a front view of the capstan roll which concerns on one Embodiment of this disclosure. FIG. 5 is a sectional view taken along line XX of FIG. 1A. It is a perspective view of the capstan roll shown in FIG. 1A. It is a cross-sectional view which expanded the part A of FIG. 1B. It is a partial cross-sectional view which shows the mounting state to the rotating shaft of a capstan roll. (A) is a partial cross-sectional view showing an example of a state in which the lock pin is inserted into the lock pin insertion hole portion in the present disclosure, and (b) is a perspective view showing the lock pin used in (a). (A) is a partial cross-sectional view showing another example of the state in which the lock pin is inserted into the lock pin insertion hole portion in the present disclosure, and (b) is a perspective view showing the lock pin used in (a). (A) is a partial cross-sectional view showing still another example of the state in which the lock pin is inserted into the lock pin insertion hole portion in the present disclosure, and (b) is a perspective view showing the lock pin used in (a). It is the schematic which shows an example of the wire drawing machine provided with the capstan roll of this disclosure. It is a perspective view which shows an example of the cone-shaped capstan roll used for the wire drawing machine shown in FIG.

Hereinafter, the capstan roll and the wire drawing machine according to the embodiment of the present disclosure will be described with reference to the drawings.

FIGS. 1A to 1C show Capstan Roll 1 according to an embodiment of the present disclosure. The capstan roll 1 includes a metal core body 2 and a ceramic outer roll 3 mounted on the outer peripheral surface of the metal core body 2. The metal core 2 is made of an annular body having a through hole 4 in the center, and a key groove 5 is provided on the inner peripheral surface of the annular body.

The metal core 2 is preferably formed of, for example, carbon steel for machine structure (S45C or the like), an aluminum alloy, stainless steel, or the like. The main component of the ceramic outer roll 3 is preferably, for example, zirconium oxide, aluminum oxide, silicon nitride, sialon, or the like. Here, the main component is a component that accounts for 80% by mass or more of 100% by mass of all the components constituting the ceramics.

Ceramics containing zirconium oxide as a main component may contain, for example, silicon oxide and / or aluminum oxide as components other than the main component. Further, the ceramics containing aluminum oxide as a main component may contain at least one selected from, for example, silicon oxide, calcium oxide, magnesium oxide and boron oxide as components other than the main component.

Ceramics containing aluminum oxide as a main component may contain, for example, silicon, magnesium and boron in the following ranges in terms of the following oxides.
SiO ₂ : 3% by mass to 5% by weight
MgO: 1% by weight to 1.5% by weight
B ₂ O ₃ : 0.5% by mass to 3.5% by weight
NiO: 4 mass ppm or less

The silicon oxide has the effect of firmly bonding the aluminum oxide particles to each other in the sintering step and suppressing the growth of the aluminum oxide particles.
When the silicon oxide content is within the above range, the hardness of the outer peripheral surface 3c of the ceramic outer roll 3 can be increased, so that the wear resistance is improved and the wire W is in sliding contact with the outer peripheral surface 3c. However, shedding can be reduced.

Magnesium oxide firmly bonds aluminum oxide particles to each other in the sintering process.
When the content of silicon oxide is in the above range, shedding is reduced even if the wire W is in sliding contact with the outer peripheral surface 3c, and the formation of magnesium aluminate having a linear expansion coefficient different from that of aluminum oxide is suppressed. Even if it is used in an environment where the temperature rises and falls repeatedly, cracks are less likely to occur.

Boron oxide has a large effect of suppressing the growth of aluminum oxide particles in the firing process. When the oxide of boron is in the above range, the abrasion resistance and the corrosion resistance to acid are improved.
Alminoborate (eg, Al ₁₈ B ₄ O ₃₃ , Al ₅ BO ₉ ) may be present as crystals. If there are crystals of alminoborate, even if a mechanical impact is applied to the outer peripheral surface 3c of the ceramic outer roll 3 to cause microcracks, the cracks will occur due to the crystals of aluminoborate such as Al ₁₈ B ₄ O ₃₃ . Progress is hampered. The crystal shape of alminoborate is, for example, columnar.

The ceramics containing aluminum oxide as a main component further contains nickel, and the content thereof may be 4 mass ppm or less in terms of oxide (NiO).

When the nickel content is within the above range, the variation in color tone is suppressed and the commercial value is improved.
Ceramics containing silicon nitride or sialon as a main component may contain, for example, aluminum oxide and / or a rare earth metal oxide as a component other than the main component.

To confirm the principal components of ceramics, first, the results obtained by measurement using an X-ray diffractometer (XRD) are collated with a JCPDS card to identify the contained compounds. Next, the content obtained by converting the value obtained by measurement using a fluorescent X-ray analyzer (XRF) or an ICP (Inductively Coupled Plasma) emission spectrometer (ICP) into the specified compound. If is 80% by mass or more, it is the main component. Specifically, if it is confirmed that ZrO ₂ is contained from the measurement by XRD and the value (content) obtained by converting the Zr value obtained by ICP into ZrO ₂ is 80% by mass or more, oxidation is performed. Zirconium is the main component of ceramics.
A component having a content of about ppm by mass, for example, Ni, may be determined using a glow discharge mass spectrometer (GDMS) and converted into an oxide (NiO).

As shown in FIG. 2, the rotating shaft 6 of the wire drawing machine is inserted into the through hole 4 of the metal core body 2. The key 8 is fitted in the key groove 5 provided on the inner peripheral surface of the metal core body 2 so as to straddle the key groove 7 formed on the rotating shaft 6. As a result, the capstan roll 1 is prevented from rotating with respect to the rotating shaft 6, and can be reliably driven to the rotation of the rotating shaft 6.

On the other hand, the outer peripheral surface of the metal core 2 and the inner peripheral surface of the ceramic outer roll 3 are bonded by filling resin between them, but it is not sufficient to suppress rotation by bonding alone. Therefore, as shown in FIGS. 1A to 1C, the outer peripheral surface of the metal core 2 and the inner peripheral surface of the ceramic outer roll 3 face each other and have holes for inserting lock pins (hereinafter, simply abbreviated as holes). ) The recesses 10a and 10b forming the 9 are formed, and the metal lock pin 11 is inserted into the hole 9. As a result, the ceramic outer roll 3 can be fixed to the metal core 2, and the ceramic outer roll 3 can be prevented from rotating with respect to the metal core 2. The lock pin 11 is made of, for example, carbon steel for mechanical structure (S45C or the like) or structural steel for mechanical alloy (SCM435). In particular, structural steel for mechanical alloys (SCM435) has high mechanical strength and toughness, and is therefore preferably used as the lock pin 11.
It is preferable that a plurality of holes 9 are provided in the circumferential direction of the metal core 2 and the ceramic outer roll 3.

As shown in FIG. 1A, the plurality of holes 9 are located at positions that extend radially from the axis A of the rotating shaft 6 and deviate from the region B that covers the keyway 5 of the metal core 2. The region B is defined by two lines b1 and b2 passing through both ends of the bottom of the recess forming the axis A and the keyway 5.
Preferably, the hole 9 extends radially from the axis A of the rotating shaft 6 and deviates from the center line C passing through the center of the key groove of the metal core 2 by 30 ° or more, preferably 45 ° or more in the circumferential direction. It should be in position. That is, in FIG. 1A, it means that the angle α between the center of the hole 9 and the center line C is 30 ° or more, preferably 45 ° or more.
As shown in FIG. 1A, the angle α is a clockwise and counterclockwise angle from the center line C, so that the distance between the two

holes

9 and 9 is preferably at least 60 °.

In this way, since the hole 9 is formed at a position outside the region B where the key groove 5 is located, the distance between the hole 9 and the key groove 5 is widened, and the capstan roll 1 is rotated at high speed by the wire. Even if the ceramic outer roll 3 is pulled, the mechanical strength of the portion sandwiched between the hole 9 and the key groove 5 is maintained, so that the ceramic outer roll 3 can be suppressed from being damaged.

FIG. 1D is an enlarged cross-sectional view of part A of FIG. 1B. As shown in FIG. 1D, the ceramic outer roll 3 includes a straight body portion 3a and a flange portion 3b extending radially outward at at least one end of the straight body portion 3a, and the straight body portion 3a The connecting surface 3d of the flange portion 3b connected to the outer peripheral surface 3c of the above may be inclined so that the width of the outer peripheral surface 3e of the flange portion 3b is narrowed.
With such a configuration, when the wire W that is in sliding contact with the outer peripheral surface 3c is stretched, the risk of damaging the wire W is reduced as compared with the ceramic outer roll 3 having a structure in which the connecting surface 3d is orthogonal to the outer peripheral surface 3c. ..
The angle (inclination angle θ) formed by the connecting surface 3d and the end surface 3f of the flange portion 3b is preferably, for example, 3 ° or more and 7 ° or less.

FIG. 3A shows an example of the state in which the lock pin 11 is inserted into the hole 9. In this example, the hole 9 has a circular cross section. Therefore, the lock pin 11 also has a cylindrical shape as shown in FIGS. 3A and 3B. The position of the top surface of the lock pin 11 is preferably a position recessed by 0.1 mm to 0.5 mm from the end surface 3f of the flange portion 3b toward the inside of the metal core body 2.

The gap S between the outer peripheral surface of the metal core 2 and the inner peripheral surface of the ceramic outer roll 3 is preferably filled with a resin such as a thermosetting resin, an epoxy resin, or a silicon-based resin. The same applies to the gap in the hole 9. In the case of epoxy resin, it is preferable that it is a two-component mixed room temperature curing type. Since it does not have to be cured at a high temperature, it is less susceptible to deformation due to heat.
It is preferable that the gap S between the outer peripheral surface of the metal core 2 and the inner peripheral surface of the ceramic outer roll 3 is provided with an adhesive layer (not shown) containing an epoxy resin as a main component and an amine compound.
The adhesive layer having such a structure has almost no decrease in adhesive strength even when exposed to a high temperature environment for several months, so that long-term reliability is improved even when the capstan roll is used in such an environment. To do.
The main component of the adhesive layer is the component having the highest content among the components constituting the adhesive layer.
The components constituting the adhesive layer may be identified using a Fourier transform infrared spectroscopic analyzer (FTIR) or a gas chromatograph (GCmass).

FIG. 4A shows another example different from FIG. 3A. As shown in FIG. 4A, the outer peripheral surface of the metal core 2 and the inner circumference of the ceramic outer roll 3 forming the hole 91 are shown. The recesses 10a ′ and 10b ′ formed on the surface respectively have a straight portion L intersecting the circumferential direction (direction indicated by the arrow Y) of the metal core body 2 and the ceramic outer roll 3.

As shown in FIGS. 4A and 4B, the lock pin 111 inserted into the hole 91 has a rectangular cross section having a straight portion 111a facing the straight portion L. Others are the same as those in the above embodiment, so the same reference numerals are given and the description thereof will be omitted. The straight line portion L preferably intersects the circumferential direction Y. Further, the straight portion L may be formed in only one of the recesses 10a and 10b.

In this way, a straight portion L is provided on the inner peripheral surface of the hole portion 91, and the lock pin 111 also has a rectangular cross section corresponding to the linear portion L, so that the capstan roll 1 is locked with the hole portion 91 in the rotation direction (that is, the Y direction). The pin 111 comes into surface contact with the pin 111, and the strength can be improved against the shear stress generated by the tension of the wire due to the high-speed rotation of the capstan roll 1.

FIG. 5A shows still another example, and as shown in FIG. 5, the inner peripheral surface of the hole 92 is the circumferential direction of the metal core 2 and the ceramic outer roll 3 (direction indicated by the arrow Y). It has a straight portion L'intersecting with respect to. The lock pin 112 inserted into the hole 91 has a straight portion 112a facing the straight portion L'as shown in FIGS. 5A and 5B. Others are the same as the examples shown in FIGS. 4A and 4B.

Next, an example of a wire drawing machine equipped with the capstan roll 1 of the present disclosure will be described with reference to FIG. The wire drawing machine 20 shown in FIG. 6 has a so-called parallel hanging wire drawing structure. In the wire drawing machine 20, the rotating shafts 6a and 6b are arranged at predetermined positions inside the machine base 21, and the cone-shaped capstan roll 100 is fixed to both of the rotating shafts 6a and 6b. That is, the capstan rolls 100 fixed to the respective rotation shafts 6a and 6b rotate in accordance with the rotation of the rotation shafts 6a and 6b, respectively. A plurality of dies (dice group) 12 are arranged in the gap between the rotating shaft 6a and the rotating shaft 6b.

As shown in FIG. 7, the cone-shaped capstan roll 100 is a combination of a plurality of stages of capstan rolls 1 whose outer diameter gradually increases from one end (I) to the other end (II). , A plurality of steps of outer peripheral surfaces 1a serving as sliding contact surfaces are provided. The cone-shaped capstan roll 100 is a wire drawing machine for stretching the wire W, and is rotatably installed by the rotation of the rotating shaft 3. For example, the cone-shaped capstan roll 100 rotates at 1000 rpm to 6000 rpm.
The capstan roll 1 of the present disclosure is not limited to only one stage as shown in FIGS. 1A to 1C, but also includes a cone-shaped capstan roll 100 in which a plurality of stages are integrally formed.

The wire drawing machine 20 includes a drive motor 13, a drive pulley 14, a driven pulleys 15 and 16, a drive belt 17, and a driven belt 18 at the end of the machine base 21. A drive belt 17 is hung around the drive pulley 14 and the driven

pulleys

15 and 16, the drive pulley 14 is rotated by the drive motor 13, and both the driven

pulleys

15 and 16 are driven and rotated. The driven pulley 15 is connected to the rotating shaft 6b, the drive pulley 14 is connected to the rotating shaft 6a, and the rotating shafts 6a and 6b are rotationally driven by the drive motor 13.

In the wire drawing machine 20, the wire W sent from the outside via the guide roller (not shown) is conveyed while being hung around the two capstan rolls 100. Specifically, the wire W sent from the outside is passed through the die group 12 arranged between the capstan rolls 100 and 100, and the two capstan rolls 100 are rotated by driving the drive motor 13. At this time, the wire W is sequentially hung from the one having the smaller outer diameter to the one having the larger outer diameter (from the upper side to the lower side in the illustrated surface) among the multi-stage sliding contact surfaces of the capstan roll 100. .. The wire W is made of, for example, Cu. The wire W may be various metal wires such as Au and Al other than Cu.

In the wire drawing machine 20, the capstan roll 100 is rotated by the drive of the drive motor 13, and the wire W is forcibly and sequentially passed through the die group 12 while being reduced in diameter and drawn. Although FIG. 6 shows a device using two capstan rolls 100, the device may be installed by further increasing the number of capstan rolls 100.

Although the embodiments of the present disclosure have been described above, the capstan roll of the present disclosure is not limited to the above embodiments, and various improvements and improvements can be made.

1 Capstan roll 1a Outer surface 2 Metal core 3 Ceramic outer roll 3a Straight body 3b Border 3c Outer surface 3d Connection surface 3e Outer surface 3f End surface 4 Through hole 5 Key groove 6, 6a, 6b Rotating shaft 7 Key groove 8 keys 9 Lock pin insertion holes 10a, 10b Recesses 11, 111, 112 Lock pins 111a Straight part 112a Straight part 12 Die 13 Drive motor 14

Drive pulley

15, 16 Drive pulley 17 Drive belt 18 Drive belt 20 Wire drawing machine 21 Machine stand 100 Cone-shaped capstan roll A Axial center B Region C Center line L, L'Straight line S Gap Y Circumferential direction W wire

Claims

A metal core body composed of an annular body having a through hole through which a rotation shaft is inserted in the central portion and having a key groove on the inner peripheral surface of the annular body.
A ceramic outer roll mounted on the outer peripheral surface of the metal core body is provided.
The outer peripheral surface of the metal core body and the inner peripheral surface of the ceramic outer roll are respectively formed with recesses facing each other to form a hole for inserting a lock pin.
The capstan roll is located at a position where the lock pin insertion hole extends radially from the axis of the rotation shaft and is out of the region of the metal core body covering the keyway.
The capstan roll according to claim 1, wherein the key groove is concave in a plan view, and the region is defined by two lines passing through both ends of the axial center of the rotating shaft and the bottom of the concave key groove.
Claim 1 or the position where the lock pin insertion hole portion extends in the radial direction from the axial center of the rotation shaft and deviates from the line passing through the center of the key groove of the metal core body in the circumferential direction by 30 ° or more. The capstan roll according to 2.
The capstan roll according to any one of claims 1 to 3, wherein the lock pin insertion holes are provided in a plurality in the circumferential direction of the metal core body and the ceramic outer roll.
At least one of the recesses formed on the outer peripheral surface of the metal core and the inner peripheral surface of the ceramic outer roll, which form the hole for inserting the lock pin, is the metal core and the outer ceramic. The lock pin having a straight portion intersecting the circumferential direction of the roll and being inserted into the lock pin insertion hole portion has a straight portion facing the straight portion according to any one of claims 1 to 4. The capstan roll described.
The capstan roll according to any one of claims 1 to 5, wherein the ceramic outer roll is mainly composed of zirconium oxide, aluminum oxide, silicon nitride or sialon.
The capstan roll according to claim 6, wherein the ceramic outer roll contains aluminum oxide as a main component, and silicon, magnesium, boron and nickel are converted into the following oxides and contained in the following ranges, respectively.
SiO 2 : 3% by mass to 5% by weight
MgO: 1% by weight to 1.5% by weight
B 2 O 3 : 0.5% by mass to 3.5% by weight
The capstan roll according to claim 7, wherein the ceramic outer roll contains nickel, and the content thereof is 4 mass ppm or less in terms of oxide (NiO).
Claims 1 to 8 include an adhesive layer provided in a gap between the outer peripheral surface of the metal core and the inner peripheral surface of the ceramic outer roll, and the adhesive layer contains an epoxy resin as a main component and an amine compound. The capstan roll described in any of.
The ceramic outer roll includes a straight body portion and a flange portion extending radially outward at at least one end of the straight body portion, and is connected to the outer peripheral surface of the straight body portion. The capstan roll according to any one of claims 1 to 9, wherein the connecting surface is inclined so that the width of the outer peripheral surface of the collar portion is narrowed.
A wire drawing machine provided with the capstan roll according to any one of claims 1 to 10.