JP2006071285A - Sensor ring manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a sensor ring capable of sintering the sensor ring while integrating with a one tooth gear wheel and a multiple tooth gear wheel. <P>SOLUTION: The method of manufacturing the sensor ring is characterized in that the gear members provided with a plurality of teeth 14, 15 on the periphery of ring shape thick plates are formed, and shaved with a shaving edge 20 for shaving, the shaving edge of which is notched by one tooth portion 22 among teeth 15, thereby the sensor ring member integrated with a gear tooth member and the ring member with the plurality of gear teeth can be obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the control of an automobile anti-lock brake device or a machine tool, it is necessary to accurately detect and control the number of rotations of wheels and blades. Usually, a sensor using a change in magnetism is often used to detect the number of rotations, and a sensor ring, which is a ring-shaped part having magnetic material irregularities arranged on the outer periphery, is rotated to generate a change in magnetism. The present invention relates to a method for manufacturing the sensor ring.

  Conventionally, as shown in FIG. 6, in order to sense the rotational speed, that is, the speed and direction, a plurality of teeth 34 having a plurality of tooth-shaped irregularities are formed around the ring-shaped magnetic body. In order to sense the absolute position of the first ring 31, a second ring 32 is formed in which convex teeth, that is, a single tooth 33, is formed only at one place around the ring-shaped magnetic body. The first ring 31 is secured to the screw holes 36 formed in the first ring 31 with bolts 37 inserted into the holes 35 formed in the second ring 32. The sensor ring 30 is configured by integrally connecting the second ring 32 and the second ring 32.

  As shown in FIG. 7A, a magnet 42 is arranged outside the teeth 41, and a magnetic field is interposed between the magnet 42 and the teeth 41 (corresponding to the plurality of teeth 34 and the single tooth 33 in FIG. 6). A magnetic sensor 43 whose electric resistance changes in accordance with the strength of is arranged.

  Since the teeth 41 are made of a magnetic material, as shown in FIG. 7A, when the teeth 41 are positioned at the shortest position that accurately corresponds to the magnet 42, the magnetic flux passing through the magnetic sensor 43 is maximized, As shown in FIG. 7B, the magnetic flux passing through the magnetic sensor 43 becomes weaker as the teeth 41 rotate. Since the magnetic flux becomes the weakest when the detection element constituted by the magnet 42 and the magnetic sensor 43 is in a position opposite to the tooth bottom, an AC output is output from the terminals 44-1 and 44-2 of the magnetic sensor 43 accordingly. can get.

  By arranging magnetic sensors corresponding to the plurality of teeth 34 of the first ring 31 and the one tooth 33 of the second ring 32 according to such a principle, the rotational speed, direction, absolute position, etc. of the sensor ring 30 can be determined. Can be detected.

  By the way, since the conventional sensor ring 30 has two parts joined together by screws or the like, the positioning accuracy of the two parts is difficult, it is difficult to guarantee the accuracy of the sensor, and the manufacturing cost of the parts is also difficult. However, there were problems such as taking two.

Patent Document 1 describes that a plurality of tooth portions and a single tooth portion are integrally formed by sintering.
JP-A-4-335111

  In the above prior art, when a rotor part having one tooth and a rotor part having a plurality of teeth are integrated and manufactured by sintering, the shape balance is poor, so the lower die punch used in compacting As shown in FIG. 8, an independent punch structure such as a lower first punch 61 and a lower second punch 62 is obtained.

  The mold 60 includes a lower first punch 61, a lower second punch 62, a core bar 63, a die 64, an upper punch 65, and the like, and is filled with a raw material powder 66. 62-1 represents a single tooth.

  The lower first punch 61 is a punch that press-molds a plurality of teeth (for example, 255 teeth if the total number of teeth is 256 teeth) subtracted from the total number of teeth. If the total number of teeth is 256, 255) are required. The lower second punch 62 is a punch that press-molds the remaining portion excluding the plurality of teeth.

  Here, when the diameter of the rotor is 154 mm, for example, the maximum width of the lower first punch 61 is very small, for example, 0.8 mm, and the punch length is long, for example, 110 mm. Occurs and breakage is very likely to occur.

  Since the price of the die punch is high, this breakage is a major production problem. In addition, in the mold assembly, for example, assembling as many as 255 lower first punches 61 and one lower second punch 62 with high accuracy requires a very long time and requires a highly skilled technician. There is also.

  Further, since the height of the single tooth 62-1 in the axial direction is twice as large as the height of the plurality of teeth in the same direction, the compact density of the single tooth 62-1 is higher than that of the plurality of teeth. It will definitely fall. For this reason, even if it sinters, the intensity | strength of this part will become low, and the single tooth 62-1 will be damaged by a slight impact. A product becomes defective only by missing one tooth 62-1. Therefore, there has been a large production problem that the product yield is extremely low.

  In order to solve the above problems, in the sensor ring manufacturing method of the present invention, a gear-shaped sensor ring material in which a plurality of concave and convex portions are formed around the outside of a ring-shaped thick plate is created, and the gear-shaped sensor ring By shaving the material using a shaving blade in which one part of the convex part is cut out, a ring-shaped part in which a single-toothed convex part is formed in the periphery and a plurality of irregularities in the periphery A sensor ring in which a ring-shaped portion having a plurality of teeth is integrated is obtained.

  The present invention has the following effects.

  1. From the ring-shaped sensor ring material parts with multiple irregularities, the necessary shape is obtained by scraping off the other convex parts by shaving method leaving one convex part for the required length. The sensor ring material parts can be made in a well-balanced shape, and even when compacted by powder metallurgy, it is easy to uniformly fill the powder, eliminating the reduction in single-tooth density, thereby improving product yield. Can be improved. Also, the problem of mold breakage can be solved.

  Moreover, since the conventional two parts become one part, the position of the plurality of teeth and the single tooth has no dimensional variation between the parts and can be mass-produced. In addition, the manufacturing cost is reduced by 1 compared with the conventional method. It became possible to hold below / 2.

  2. If shaving is performed without grooving, the swarf cut off by shaving will be connected to the part where the teeth are left. When the blade reaches the groove, the chips are separated from the main body. Moreover, due to the presence of the groove, magnetic interference between the upper and lower two tooth portions can be avoided as a sensor.

  3. When creating a well-balanced sensor ring material part with multiple protrusions around the ring shape, you can create a high-quality material using powder metallurgy techniques. Since a single tooth is formed by shaving using a shaving blade cut out only at the position of a single tooth, it is possible to accurately form a single tooth on a material at a very low cost. As a result, it is possible to manufacture a sensor ring having a shape in which a ring-shaped portion having one tooth around the periphery and a ring-shaped portion having a plurality of teeth formed at the periphery are integrated at an accurate position at a very low cost. .

  4). A well-balanced sensor ring material with multiple protrusions formed around the ring shape is first created by a cutting method, and this is shaved using a shaving blade that is cut out only at the position of one tooth. Therefore, it is possible to accurately form a single tooth on a sensor ring material at a very low cost. As a result, it is possible to manufacture a sensor ring having a shape in which a ring-shaped portion having one tooth around the periphery and a ring-shaped portion having a plurality of teeth formed at the periphery are integrated at an accurate position at a very low cost. .

  5. A well-balanced sensor ring material with multiple protrusions formed around the ring shape is first created by a forging method, and this is shaved using a shaving blade cut out only at the position of one tooth. Since single teeth are formed, single teeth can be accurately formed on the sensor ring material at a very low cost. As a result, it is possible to manufacture a sensor ring having a shape in which a ring-shaped portion having one tooth around the periphery and a ring-shaped portion having a plurality of teeth formed at the periphery are integrated at an accurate position at a very low cost. .

  6). A well-balanced sensor ring material part with multiple protrusions formed around the ring shape is first created by a stamping technique, and then shaved using a shaving blade that is cut out only at the position of one tooth. Therefore, it is possible to accurately form a single tooth on a sensor ring material at a very low cost. As a result, it is possible to manufacture a sensor ring having a shape in which a ring-shaped portion having one tooth around the periphery and a ring-shaped portion having a plurality of teeth formed at the periphery are integrated at an accurate position at a very low cost. .

  A gear-shaped sensor ring material in which a plurality of uneven portions are formed in the thickness direction around the outside of the ring-shaped thick plate is produced by a powder metallurgy technique. Next, a groove is formed by lathe processing at the center of the periphery of the ring. Next, the gear-shaped sensor ring material is subjected to shaving using a shaving blade in which a single tooth of the convex portion is cut, thereby forming a single tooth having a length approximately half that of the concave and convex portion. In this way, a sensor ring is manufactured in which a ring-shaped part having a single tooth formed in the periphery and a ring-shaped part formed with a plurality of teeth in the periphery are integrated.

  An embodiment of the present invention will be described with reference to FIGS. 1 is a sensor ring manufactured according to the present invention, FIG. 2 is a sensor ring manufacturing procedure explanatory diagram according to the present invention (part 1), FIG. 3 is a sensor ring manufacturing procedure explanatory diagram (part 2), and FIG. 4 is a sensor ring manufacturing procedure. Explanatory drawing (No. 3) and FIG. 5 are explanatory diagrams of sensor ring manufacturing procedures (No. 4).

  In the figure, 1 is a sensor ring manufactured according to the present invention, 2 is a first ring-shaped portion, 3 is a second ring-shaped portion, 4 is a single-tooth portion, 5 is a multiple-tooth portion, and 10 is a sensor ring. Element body, 11 is an uneven part, 12 is a sensor ring base, 13 is a groove, 14 is a first tooth part, 15 is a second tooth part, 20 is a shaving blade part, 21 is a base part, and 22 is a notch part. Indicates.

  As shown in FIG. 1, a sensor ring 1 manufactured according to the present invention includes a first ring-shaped portion 2 having a plurality of tooth portions 5 formed of a plurality of concave and convex portions on the periphery, and a single convex portion on the periphery. A second ring-shaped portion 3 formed with a single tooth body portion 4 is integrally formed. The single-tooth body part 4 and the multiple-tooth body part 5 are located in the up-down state as shown in FIG. The first ring-shaped portion 2 and the second ring-shaped portion 3 are not separate members but are an integral one processed from a single sensor ring material 10 as shown in FIG. Therefore, the sensor ring 1 is an integral one processed from the sensor ring material 10.

  The sensor ring material 10 is a gear-shaped magnetic body in which a plurality of concavo-convex portions 11 are formed on a circular outer peripheral portion around a ring-shaped thick plate, and is produced using, for example, a powder metallurgy technique. The

  For example, -100 mesh (particle size: 147 to 48 microns, average particle size: 100 microns) pure iron powder is placed in a mold and pressed at 4 to 8 to obtain a material having the shape shown in FIG. The sensor ring material 10 is obtained by high-temperature sintering at ˜1200 ° C. It is possible to form the material with powder other than -100 mesh, but when the particle size becomes larger than -100 mesh (maximum particle size of 147 microns or less), the roughness of the material increases and the measurement accuracy of magnetism deteriorates. In addition, a fine powder such as -325 mesh (48 microns or less) is too fine, and the flowability of the powder becomes poor, and it is difficult to uniformly fill the mold, so this -100 mesh is preferable.

  As shown in FIG. 3, the sensor ring material 10 shown in FIG. 2 is processed by, for example, a lathe to provide a groove 13 around the circular shape, and the uneven portion 11 is separated into an upper stage and a lower stage. The sensor ring base 12 in which the 14 and the second tooth part 15 are formed is obtained.

  The shaving blade part 20 necessary for performing the shaving process is fixed to the base part 21. The diameter of the tip of the shaving blade 20, that is, the root diameter, is made to coincide with the diameter of the uneven portion formed on the second tooth body 15 to be scraped off by shaving. The shaving blade 20 is formed with a notch 22 corresponding to the size of the convex portion of the second tooth body 15. The depth of the notch 22 is formed so that only the second tooth body 15 portion is scraped off. As a result, only one tooth can be left during shaving.

  The production method of the present invention will be described.

  (1) First, as shown in FIG. 2, a gear-shaped sensor ring material 10 in which a plurality of concave and convex portions 11 are formed in the vertical direction on the circular outer peripheral portion is prepared by a powder metallurgy technique. In this case, -100 mesh pure iron powder is used as the magnetic powder, and this is put into a mold and pressed at 6 t to form. And this molded object is taken out from a metal mold | die and sintered at 1150 degreeC, and the sensor ring raw material 10 is obtained. Note that, for example, 256 teeth can be formed by the concavo-convex portion 11, but in the drawing, the number of teeth does not coincide with the above description in order to clarify the configuration.

  (2) The sensor ring material 10 obtained in this way shown in FIG. 2 is grooved with a lathe to form grooves 13 in the peripheral portion, and the uneven portion 11 shown in FIG. As shown, the sensor ring base 12 is obtained by dividing the first tooth body 14 and the second tooth body 15.

  (3) Next, the sensor ring base 12 is placed on the shaving blade 20 as shown in FIG. 4 and pushed in the direction of the arrow. Thereby, as shown in FIG. 5, the sensor ring base 12 leaves only one tooth convex portion, and the other unevenness is scraped off. And by taking out this, the sensor ring 1 as shown in FIG. 1 is obtained.

  When the sensor ring base 12 is placed on the shaving blade part 20, the convex part that matches the notch part 22 of the second tooth body part 15 remains automatically without being cut, so the notch part 22 and the sensor ring base 12 It is not necessary to consider the positional relationship between

  In this way, in the present invention, the two parts of the first ring 31 and the second ring 32 shown in FIG. 6 can be made into one part, and there is no dimensional variation between the parts at the positions of the multiple teeth and the single tooth. Thus, mass production can be performed with high accuracy, and the manufacturing cost can be reduced to less than half compared with the conventional method.

  In addition, although this invention demonstrated the case where it created using the technique of powder metallurgy for manufacture of a sensor ring raw material, this invention is not restricted to this, It can obtain also by techniques, such as cutting, forging, and punching.

It is an example of the sensor ring manufactured by this invention. It is sensor ring manufacturing procedure explanatory drawing (the 1) of this invention. It is sensor ring manufacturing procedure explanatory drawing (the 2) of this invention. It is sensor ring manufacturing procedure explanatory drawing (the 3) of this invention. It is sensor ring manufacturing procedure explanatory drawing (the 4) of this invention. It is explanatory drawing of a prior art example. It is operation | movement explanatory drawing of a sensor ring. It is a block diagram of the compacting die in the case of manufacturing by the conventional integrated sintering method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sensor ring 2 1st ring-shaped part 3 2nd ring-shaped part 4 Single sheet tooth part 5 Multiple sheet tooth part 10 Sensor ring raw material 11 Uneven part 12 Sensor ring base 13 Groove 14 1st tooth part 15 2nd Tooth body part 20 Shaving blade part 21 Base part 22 Notch part

Claims (6)

Create a gear-shaped sensor ring material with multiple irregularities formed around the outside of the ring-shaped plank,
This gear-shaped sensor ring material is shaved using a shaving blade in which one part of the convex part is cut out, so that a ring-shaped part having a single-toothed convex part formed on the periphery, and a peripheral part A sensor ring manufacturing method comprising: obtaining a sensor ring integrated with a ring-shaped portion having a plurality of teeth formed of a plurality of concave and convex portions.   The sensor ring manufacturing method according to claim 1, wherein a circumferential groove is formed at the center of the plurality of concave and convex portions around the outside prior to the shaving process.   The sensor ring manufacturing method according to claim 1, wherein the gear-shaped sensor ring material is prepared by a powder metallurgy technique.   The sensor ring manufacturing method according to claim 1, wherein the gear-shaped sensor ring material is created by a cutting technique.   The sensor ring manufacturing method according to claim 1, wherein the gear-shaped sensor ring material is prepared by a forging method.   The sensor ring manufacturing method according to claim 1, wherein the gear-shaped sensor ring material is created by a punching method.

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