JP7158507B2 - ceramic nozzle and winding machine - Google Patents

Description

The present disclosure relates to ceramic nozzles and winders.

2. Description of the Related Art Conventionally, an automatic winding machine for winding an inductor such as a high frequency coil uses a ceramic nozzle for guiding a wire for winding.

As such a ceramic nozzle, Patent Literature 1 proposes a ceramic nozzle made of a brittle material such as ceramic, which has a through hole for guiding a wire rod.

JP-A-9-63883

The ceramic nozzle of the present disclosure is provided with a through hole for guiding a wire along the axial direction, and is cut at a load length rate of 25% in the roughness curve of the inner peripheral surface forming the through hole. A cut level difference (Rδc) on the roughness curve, which represents the difference between the level and the cut level at 75% load length rate on the roughness curve, is 1.6 µm or less.

The winding machine of the present disclosure uses the above ceramic nozzle.

1(a) is a plan view and (b) is a side view showing a schematic configuration of a winding machine provided with a ceramic nozzle of the present disclosure; FIG. FIG. 4 is a schematic diagram showing a state of winding using the ceramic nozzle of the present disclosure; 1A is a perspective view, and FIG. 1B is a cross-sectional view including an axis, showing an example of a ceramic nozzle of the present disclosure; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, in all the drawings of this specification, the same parts are denoted by the same reference numerals unless confusion occurs, and the description thereof will be omitted as appropriate.

The ceramic nozzle and winding machine of the present disclosure will be described in detail below with reference to the drawings.

FIG. 1 shows a schematic configuration of a winding machine provided with a ceramic nozzle of the present disclosure, (a) is a plan view and (b) is a side view.

FIG. 2 is a schematic diagram showing a state of winding using the ceramic nozzle of the present disclosure.

FIG. 3 shows an example of the ceramic nozzle of the present disclosure, where (a) is a perspective view and (b) is a cross-sectional view including the shaft.

In a winding machine 30 shown in FIG. 1, a wire 2 supplied from a drum 1 is guided through guide rollers 3 and 4 to a ceramic nozzle 5 made of a cylindrical body, and the wire 2 guided by the ceramic nozzle 5 is The tip is clamped by chuck 6 .

As shown in FIG. 3B, the ceramic nozzle 5 is provided with through holes 5a for guiding the wire rod 2 along the axial direction. are both curved and expanding in diameter.

The ceramic nozzle 5 has, for example, _a total length L1 of 20 mm or more and 30 mm or less, an outer diameter D1 of 1.8 mm or more and 2 mm or less on the supply port side of the wire ₂ , and an outer diameter D2 of ₁ mm or more on the discharge port side of the wire 2. ₄ mm or less, and the diameter D3 of the through hole 5a is 0.05 mm or more and 0.15 mm or less.

Ceramic nozzle 5 is supported by block 9 via plate 7 and crank 8 . A coil bobbin 10 around which the wire 2 is wound is installed so that a rotating shaft 11 fixing the coil bobbin 10 at its tip is perpendicular to the axis of the ceramic nozzle 5 .

Here, the ceramic nozzle 5 is rotated by the stroke of the air cylinder 12 .

Moreover, the block 9 is freely moved in three-dimensional directions by the following mechanism, and the ceramic nozzle 5 is also moved along with this movement.

First, the block 9 is positioned in the X-axis direction by driving the pulse motor 13 . Specifically, the block 9 is pushed by a slide shaft 17 slidably supported by a frame 16 via a feed screw 14 and a block 15 to be positioned in the X-axis direction.

Similarly, the block 9 is driven by the pulse motor 18 in the Y-axis direction via the feed screw 19 and the block 20, and is driven by the pulse motor 21 in the Z-axis direction via the feed screw 22 and the slide block 23. positioned respectively.

In this way, the ceramic nozzle 5 is positioned three-dimensionally around the coil bobbin 10, and the wire 2 is wound on the coil bobbin 10 according to this positioning as follows.

First, the wire 2, which is tensioned between the ceramic nozzle 5 and the chuck 6, is inserted through the through hole 5a of the ceramic nozzle 5 and fixed to the first terminal 24 of the coil bobbin 10 as shown in FIG. be.

Thereafter, while the ceramic nozzle 5 is moved in the X-axis direction, the rotating shaft 11 is rotated by the pulse motor 25 via a pulley or the like, thereby rotating the coil bobbin 10 fixed to the tip of the rotating shaft 11. Then, the wire rod 2 is wound around the coil bobbin 10 . After the winding on the coil bobbin 10 is completed, the wire 2 is fixed to the second terminal 26 .

The ceramic nozzle 5 of the present disclosure provided in the winding machine 30 shown in FIG. The cut level difference (Rδc) on the roughness curve, which represents the difference from the cut level at 75% load length rate on the curve, is 1.6 µm or less.

As shown in the following formula (1), the load length ratio Rmr is obtained by extracting a reference length L in the direction of the average line from the roughness curve specified in JIS B0601: 2001, and The ratio of the sum of cut lengths η1, η2, ..., ηn (load length ηp) obtained by cutting the roughness curve at the cut level parallel to the crest line to the reference length L as a percentage It is a value expressed and shows the surface properties in the height direction and in the direction perpendicular to this height direction.
Rmr=ηp/L×100 (1)
ηp: η1 + η2 + … + ηn
Corresponding to such a load length ratio Rmr, the cutting level C (Rrmr) corresponding to each of the two types of load length ratios and the cutting level difference (Rδc) representing the difference between these cutting levels C (Rrmr) are also It corresponds to the surface texture in the height direction of the surface and in the direction perpendicular to this height direction. When the cutting level difference (Rδc) is large, the surface to be measured has large unevenness.

When the cutting level difference (Rδc) is 1.6 μm or less, the unevenness of the inner peripheral surface 5b is small and the inner peripheral surface 5b becomes relatively flat, so that grains are less likely to come off from the inner peripheral surface 5b. As a result, even if the diameter of the through-hole 5a becomes small, disconnection caused by shedding of grains can be suppressed.

Also, the coefficient of variation of the cutting level difference (Rδc) may be 0.3 or less.

The coefficient of variation of the cleavage level difference (Rδc) is represented by √V ₁ /X ₁ , where √V ₁ is the standard deviation of the cleavage level difference (Rδc) and X ₁ is the average value of the cleavage level difference (Rδc). value.

When the coefficient of variation of the cutting level difference (Rδc) is within the above range, unevenness of the inner peripheral surface 5b is reduced, so that grain shedding from the inner peripheral surface 5b is more difficult to occur, and disconnection caused by this shedding is suppressed. more effective.

Moreover, the arithmetic mean roughness (Ra) in the roughness curve may be 1 μm or less.

When the arithmetic mean roughness (Ra) is 1 μm or less, the unevenness of the inner peripheral surface 5b becomes smaller, so that grain shedding from the inner peripheral surface 5b is more difficult to occur, and wire breakage caused by this shedding can be suppressed. can.

Also, the coefficient of variation of the arithmetic mean roughness (Ra) may be 0.2 or less.

Since the coefficient of variation of the arithmetic mean roughness (Ra) reduces unevenness of the inner peripheral surface 5b, shedding of grains from the inner peripheral surface 5b becomes more difficult, and the effect of suppressing disconnection caused by this shedding is enhanced.

Here, the coefficient of variation of the arithmetic mean roughness (Ra) is √V ₂ where the standard deviation of the arithmetic mean roughness (Ra) is √V ₂ and the average value of the arithmetic mean roughness (Ra) is X ₂ . /X is a value represented by ₂ .

In the present disclosure, the cutting level difference (Rδc) and the arithmetic mean roughness (Ra) in the roughness curve are both measured using a laser microscope device (e.g., manufactured by Keyence Corporation (VK-9510)). When using a laser microscope VK-9510, for example, the measurement mode is color ultra-depth, the gain is 953, the measurement magnification is 400, and the measurement range per point is 680 μm to 730 μm (axial direction) × 15 μm to 250 μm (circumferential direction). ), the measurement pitch is 0.05 μm, the profile filter λs is 2.5 μm, and the profile filter λc is 0.08 mm. The number of measurement ranges is at least 8 at equal intervals on the inner peripheral surface 5b excluding the portions where the wire rod supply port side and discharge port side are enlarged, and the length in the circumferential direction is the length of the through hole 5a. It may be set so that the measurement range becomes wider according to the diameter.

The skewness (R _SK1 ) of the roughness curve along the axial direction of the inner peripheral surface 5b may be smaller than the skewness (R _SK2 ) of the roughness curve of the outer peripheral surface in the circumferential direction.

The skewness (R _SK ) is defined in JIS B 0601:2001, and is an index indicating the ratio of peaks to valleys when the average height of the roughness curve is taken as the center line.

When the skewness (R _SK1 ) is smaller than the skewness (R _SK2 ), the flatness of the ridges on the inner peripheral surface 5b is higher than the flatness of the ridges on the outer peripheral surface 5c. Aggressiveness of 5b is suppressed. On the other hand, the steepness of the ridges on the outer peripheral surface 5c is higher than the steepness of the ridges on the inner peripheral surface 5b. It is easy to obtain, and reliability can be maintained even if the ceramic nozzle 5 vibrates.

This effect is such that the arithmetic mean roughness (R _a1 ) in the roughness curve along the axial direction of the inner peripheral surface 5b and the arithmetic mean roughness (R _a2 ) in the roughness curve along the circumferential direction of the outer peripheral face are substantially equivalent. For example, it also occurs when the thickness is 0.05 μm or more and 0.20 μm or less.

For example, the skewness (R _SK1 ) is −0.8 or more and 0.8 or less, and the skewness (R _SK2 ) is 1 or more and 2 or less.

In particular, the skewness (R _SK1 ) should indicate 0 or a negative value, and the skewness (R _SK2 ) should indicate a positive value. In such a case, the aggressiveness of the inner peripheral surface 5b to the wire rod 2 is further suppressed, and the reliability is improved.

In the present disclosure, the skewness (R _SK1 , R _SK2 ) and the arithmetic mean roughness (R _a1 , R _a2 ) in the roughness curve are both measured using a laser microscope (Co., Ltd.) having a measurement mode conforming to JIS B 0601:2001 VK-X1100 (manufactured by Keyence, or its successor model) can be used for measurement. As the measurement conditions, first, the magnification is 480 times, the cutoff value λs is absent, the cutoff value λc is 0.08 mm, the cutoff value λf is absent, and the inner peripheral surface 5b and the outer peripheral surface 5c to be measured are 1 to 1. The measurement range per location is set to 705 μm×530 μm, respectively.

Here, in setting the measurement range, a representative portion showing the characteristics of the surface may be selected from the surface observed at a magnification of 480 times. Three lines to be measured are drawn in the longitudinal direction on the inner peripheral surface 5b and along the lateral direction on the outer peripheral surface 5c so as to be substantially evenly spaced for each measurement range. Line roughness is measured for each line, and skewness (R _SK1 ) and skewness (R _SK2 ) are compared in nine combinations. The measured length on the outer peripheral surface 5c is 380 μm, and the measured length on the inner peripheral surface 5b is 550 μm.

The ceramic nozzle of the present disclosure is, for example, a nozzle made of ceramics whose main component is zirconium oxide, aluminum oxide, silicon carbide or silicon nitride.

The main component in ceramics refers to a component that accounts for 70% by mass or more of the total 100% by mass of the components constituting the ceramics. The components that make up the ceramics can be identified using an X-ray diffractometer (XRD). After identifying the component, the content of each component is determined using an X-ray fluorescence spectrometer (XRF) or an ICP emission spectrometer, and the content of the elements that make up the component is determined, and converted to the identified component. good.

When zirconium oxide is the main component, at least one selected from yttrium oxide (Y ₂ O ₃ ), cerium oxide (CeO ₂ ), magnesium oxide (MgO), neodymium oxide (Nd ₂ O ₃ ) and calcium oxide (CaO) May contain seeds.

When aluminum oxide is the main component, it may contain at least one selected from silicon oxide (SiO ₂ ), magnesium oxide (MgO) and calcium oxide (CaO).

Next, an example of the manufacturing method of the ceramic nozzle of the present disclosure will be described.

First, in order to obtain a ceramic nozzle containing zirconium oxide as a main component and containing 2 mol % or more and 4 mol % or less of yttrium in terms of oxide, yttrium oxide powder should be added to a total of 100 mol % of zirconium oxide powder and yttrium oxide powder. is blended so as to be 2 mol % or more and 4 mol % or less.

In addition, in order to obtain a ceramic nozzle containing zirconium oxide as a main component and at least one of magnesium and calcium in an amount of 8 mol % or more and 12 mol % or less in terms of oxide, the powder of the ceramic raw material and oxidation of the group 2 element are required. It is blended so that the powder of the oxide of the group 2 element is 8 mol % or more and 12 mol % or less in the total 100 mol % of the powder of the substance.

The average particle size (D ₅₀ ) of zirconium oxide is, for example, 0.1 μm or more and 1 μm or less.
Next, thermoplastic resins such as isobutyl methacrylate (iBMA), isobutyl methacrylate (iBMA), polystyrene, etc., paraffin wax, microwax, etc., are added as binders to the prepared raw materials, and kneaded using a kneading device to be plasticized. to obtain a chemical mixture. Here, the kneading device is, for example, a pressurized kneader, and may be kneaded at a temperature of about 140 to 160°C.

After the kneading is completed, the plasticized mixture is put into an extruder heated to a temperature at which the plasticized mixture softens to obtain a cylindrical molded body.

The inner peripheral surface forming the through-hole of the ceramic nozzle is approximately copied from the outer peripheral surface of a mandrel (core bar) installed in an extruder to obtain a molded product.

Therefore, to obtain the ceramic nozzle of the present disclosure, the difference between the cut level at 25% load length factor on the roughness curve and the cut level at 75% load length factor on the roughness curve is: A mandrel (core bar) having an outer peripheral surface with a cutting level difference (Rδc) in the roughness curve of 1.6 μm or less is used.

Similarly, in order to obtain a ceramic nozzle having a cutting level difference (Rδc) variation coefficient of 0.3 or less, the variation coefficient of the cutting level difference (Rδc) in the roughness curve of the outer peripheral surface of the mandrel (core metal) should be set to 0. .3 or less.

In order to obtain a ceramic nozzle whose roughness curve has an arithmetic average roughness (Ra) of 1 μm or less, the arithmetic average roughness (Ra) of the roughness curve of the outer peripheral surface of the mandrel (core metal) should be 1 μm or less. Just do it.

In addition, in order to obtain a ceramic nozzle having a coefficient of variation of arithmetic mean roughness (Ra) of 0.2 or less, the coefficient of variation of arithmetic mean roughness (Ra) in the roughness curve of the outer peripheral surface of the mandrel (core metal) is It should be 0.2 or less.

A cylindrical sintered body can be obtained by sequentially degreasing and sintering the obtained molded body. Here, the sintering atmosphere should be an air atmosphere, the sintering temperature should be 1300° C. or more and 1700° C. or less, and the holding time should be 2 hours or more and 4 hours or less. The ceramic nozzle of the present disclosure can be obtained by subjecting both end surfaces of the obtained sintered body to grinding.

In order to make the skewness (R _SK1 ) of the roughness curve along the axial direction of the inner peripheral surface smaller than the skewness (R _SK2 ) of the roughness curve along the radial direction of the outer peripheral surface of the cylindrical body, the inner peripheral surface is sintered. The outer peripheral surface may be subjected to centerless processing along the radial direction.

In addition, in order to make the skewness (R _SK1 ) 0 or a negative value and the skewness (R _SK2 ) a positive value, the outer peripheral surface is subjected to centerless processing along the radial direction, and JIS R 6001- 2:2017, an abrasive having a grain size of #240 or less may be used.

The present disclosure is not limited to the above-described embodiments, and various modifications, improvements, combinations, etc. are possible without departing from the gist of the present disclosure.

1: Drum 2: Wire rod 3, 4: Guide roller 5: Ceramic nozzle 6: Chuck 7: Plate 8: Crank 9: Block 10: Coil bobbin 11: Rotary shaft 12: Air cylinder 13: Pulse motor 14: Feed screw 15: Block 16: Frame 17: Slide shaft 18: Pulse motor 19: Feed screw 20: Block 21: Step motor 22: Feed screw 23: Slide block 24: First terminal 25: Step motor 26: Second terminal 30: Winding machine

Claims (4)

A ceramic nozzle consisting of a cylindrical body provided with a through hole for guiding a wire along the axial direction, at a load length ratio of 25% in the roughness curve of the inner peripheral surface forming the through hole and the cut level at a load length rate of 75% on the roughness curve (Rδc) is 1.6 μm or less ,
The arithmetic mean roughness (Ra) in the roughness curve is 1 μm or less,
The coefficient of variation of the arithmetic mean roughness (Ra) is 0.2 or less,
A ceramic nozzle, wherein the skewness (R _SK1 ) of the roughness curve along the axial direction of the inner peripheral surface is smaller than the skewness (R _SK2 ) of the roughness curve along the circumferential direction of the outer peripheral surface of the cylindrical body . 2. The ceramic nozzle according to claim 1, wherein the cutting level difference (R[delta]c) has a coefficient of variation of 0.3 or less. 3. Ceramic nozzle according to claim 1 or 2 , wherein the skewness (R _SK1 ) exhibits a zero or negative value and the skewness (R _SK2 ) exhibits a positive value. A winding machine using the ceramic nozzle according to any one of claims 1 to 3 .

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