JP5105045B2 - Mold life judgment device and mold life judgment method - Google Patents

Description

  The present invention relates to a mold life determination apparatus and a mold life determination method, and more particularly, to a mold life determination apparatus and a mold life determination method for determining the life of a mold based on a change in the shape of a gear after molding. Is.

In general, the life of a metal mold for forming a gear, specifically a bevel gear, is determined based on the wear amount of each tooth tip portion having a large forming load as a criterion.
Therefore, as shown in FIG. 7, when the number of forgings increases and wear of each tooth tip portion of the die 50 progresses, the wear portion of each tooth tip portion of the die 50 at each tooth bottom portion of the bevel gear 60. The surplus portion 61 appears at a portion corresponding to 51.
Conventionally, when determining the life of the mold 50, the operator visually determines the progress of the surplus portion 61 that appears at the bottom of each tooth of the bevel gear 60, as shown in FIG. As described above, the operator presses the limit gauge 70 against each tooth bottom portion of the bevel gear 60 and visually determines whether or not there is a gap 71 between the limit gauge 70 and each tooth tip portion of the bevel gear 60. The life of the mold 50 was judged.
However, in the case of the above-described visual judgment by the worker, there is a variation in the judgment standard by each worker, and thus the accurate life of the mold 50 cannot be judged.

In addition to the above, as a means for judging the life of the mold, by using a gear shape measuring machine, by analyzing the shape change of the tooth surface and the tooth bottom part of each tooth shape of the gear, the life of the mold 50 is increased. Judgment can be made.
That is, as shown in FIG. 9, the measuring element 80 provided in the shape measuring machine is moved along the tooth surface and the tooth bottom portion of each tooth profile of the bevel gear 60, and the shape of the tooth surface and the tooth bottom portion of each tooth shape is obtained. The amount of wear of each tooth tip portion of the mold 50 is analyzed by comparing the shape difference between the tooth surface and the tooth bottom portion of each tooth profile of the bevel gear 60 as a reference. It is possible to determine the life of the mold 50 by grasping the increase of the mold 50.
However, in this shape measuring machine, the shape measurement and shape calculation of each tooth profile of the bevel gear 60, the shape calculation, and the comparative analysis of the tooth surface and tooth shape of each tooth profile of the reference bevel gear are performed. In addition, a considerable amount of time is spent until the progress of the surplus portion 61 appearing at each tooth bottom portion of the bevel gear 60 is grasped. Can not.

Further, Patent Document 1 discloses an angle detection means for detecting a rotation angle of a gear to be measured that is rotationally driven, a measuring element that moves linearly in contact with a tooth surface of the gear to be measured, and a measuring element for the tooth surface. A moving body that moves according to the rotation of the gear to be measured so as to maintain the contact state of the gear, and a position detection means that directly detects the moving position of the measuring element at a fixed position, and the tooth surface shape of the gear is highly accurate. A gear measuring machine for measuring is disclosed.
JP 2002-107142 A

  However, it is possible to determine the life of the mold by analyzing the shape change of the tooth surface and the tooth bottom portion of each tooth form of the gear by the gear measuring machine according to the invention of Patent Document 1. In the gear measuring machine according to the first aspect of the invention, as in the shape measuring machine described above, a considerable amount of time is spent until the progress of the surplus portion appearing at each tooth bottom of the gear is determined. The service life cannot be judged in a timely manner during molding by the mold.

  The present invention has been made in view of such points, and quickly and quantitatively calculates the progress of the surplus portion appearing at each tooth bottom portion of the gear, and the amount of wear at each tooth tip portion of the mold. An object of the present invention is to provide a mold life judging device and a mold life judging method capable of grasping the increase in the number and judging the life.

According to the present invention, as a first means for solving the above-mentioned problem, the invention of the mold life judging device according to claim 1 judges the life of the mold based on the shape change of the gear after molding. A mold life judging device, wherein the die life judging device has a tip opposite to a support tool for supporting the gear and a substantially entire width direction of a tooth bottom portion of the gear supported by the support tool. A measuring element that linearly moves back and forth so as to be able to contact and separate, and a position measuring unit that measures the position of the leading end of the measuring element when the leading end of the measuring element is pressed against the tooth bottom part, During molding by the mold, the position in the height direction of the tooth bottom portion of each gear sequentially formed by the mold is sequentially measured by the position measuring means, and based on the measurement result, the position of the tooth bottom portion of each gear is displayed on the tooth bottom portion. Calculate the progress of the surplus portion that has been put out and judge the life of the mold. It is an butterfly.
According to a second aspect of the present invention, there is provided a mold life judging apparatus according to the first aspect, wherein the support supports the gear so as to be rotatable and fixed at an arbitrary tooth position. It is characterized by this.

According to the present invention, as a second means for solving the above-mentioned problem, the invention of the mold life judging method described in claim 3 is based on the change in the shape of the gear after molding, and the life of the mold is determined. A mold life determination method for determining, in the middle of molding by the mold, the position in the height direction of each tooth bottom part of each gear sequentially formed by the mold, approximately the width direction of the tooth bottom part of the gear Measures sequentially using a probe that moves forward and backward in a linearly movable manner so that the tip is opposed to and separated from the entire area, and based on the measurement result, the progress of the surplus portion that appears at the tooth bottom of each gear The situation is calculated, and the life of the mold is determined based on the calculation result.

Therefore, in the invention of the mold life judging apparatus according to the first aspect, first, the reference gear, that is, the first-formed gear is set on the support, and the gear and the position measuring means are used to set the gear. The position in the height direction of each tooth bottom is measured, and the measured value is used as a reference value. Next, the gear formed after the second time is set on the support, and similarly, the position in the height direction of each tooth bottom portion of the gear is measured by the measuring element and the position measuring means. And the amount of displacement in the height direction of each tooth bottom portion of the gear calculated by the difference between the measured value and the reference value of each tooth bottom portion of the gear formed from the second time onward, that is, appears at each tooth bottom portion of the gear. Based on the calculation result obtained by quantitatively calculating the progress of the surplus portion, the increase in the wear amount of each tooth tip portion of the mold is grasped, and the life of the mold is determined.
In the invention of the mold life judging apparatus according to the second aspect, the positions in the height direction of all the tooth bottom portions of the gear are easily measured.

  In the invention of the mold life judging method according to claim 3, the amount of displacement in the height direction of each tooth bottom portion of the gear, that is, the progress of the surplus portion appearing on each tooth bottom portion of the gear is quantified. Based on the calculated result, the increase in the amount of wear at each tooth tip portion of the mold can be grasped and its life can be judged, so that the judgment criteria for judging the life of the mold are unified. Moreover, the time for measuring the position in the height direction of each tooth bottom portion of the gear and calculating the amount of displacement is conventionally measured by measuring the shape of each tooth profile of the gear with a shape measuring machine, and each tooth shape of the reference gear. Since the time required for comparative analysis with the shape of the mold is greatly shortened, it is possible to quickly determine the service life during molding by the mold.

  According to the present invention, the progress of the surplus portion appearing at each tooth bottom portion of the gear is quickly and quantitatively calculated, the increase in wear amount of each tooth tip portion of the mold is grasped, and the life is determined. It is possible to provide a mold life determination apparatus and a mold life determination method that can be performed.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS.
As described above, when wear of each tooth tip portion of the mold 50 for forming a gear, for example, a bevel gear, progresses, wear portions of each tooth tip portion of the die 50 at each tooth bottom portion of the bevel gear 60 after molding. A surplus portion 61 (see FIG. 7) appears at a portion corresponding to 51.

And the mold life judgment apparatus 1 which concerns on embodiment of this invention is the shape change of the bevel gear 60 after shaping | molding, ie, the progress condition of the surplus part 61 which appeared on each tooth bottom part of the bevel gear 60. This is for quantitatively calculating and determining the life of the mold 50. As shown in FIG. 1, the support tool 2 supports the bevel gear 60 so that the bevel gears 60 can turn freely with their bottoms facing downward. And a measuring element 3 that linearly advances and retreats so that the tip (tip of the flat plate portion 20a) is opposed and can be contacted and separated across substantially the entire width direction of the tooth bottom portion of the bevel gear 60 supported by the support tool 2. And a position measuring means 4 for measuring the position of the tip of the probe 3 when the tip of the probe 3 is pressed against the tooth bottom of the bevel gear 60.

  As shown in FIGS. 1 and 2, the support 2 is arranged on the upper surface of an L-shaped support base 5 in which the vertical plate portion 5 a is fixed to the base plate 6 and the horizontal plate portion 5 b of the support base 5. The rotary table 7 that is freely rotatable, the positioning shaft 8 that is projected in a ring shape at predetermined intervals on the upper surface of the rotary table 7, and the bevel gear 60 are sandwiched between the rotary table 7. It is comprised from the fixing tool 9 to do.

A plurality of positioning shafts 8 for positioning the bevel gear 60 are provided in a ring shape at predetermined intervals on the upper surface of the turntable 7 so as to fit each tip between the respective tooth shapes of the bevel gear 60. The number of the positioning shafts 8 may be the number corresponding to the entire tooth bottom portion of the bevel gear 60 or may be set to a number that allows the bevel gear 60 to be positioned. In the present embodiment, six positioning shafts 8 are arranged on the turntable 7 with respect to the 13 tooth bottom portions of the bevel gear 60.
Further, as shown in FIGS. 1 and 5, these positioning shafts 8 are formed in a conical shape that tapers toward the tip. A part of the outer peripheral surface of each positioning shaft 8 is chamfered 8a obliquely upward from the outer peripheral surface in the axial direction so that each of the chamfered portions 8a faces outward. Is arranged.
As can be seen from FIG. 3, the chamfered portion 8 a of each positioning shaft 8 is configured such that when the tip of the probe 3 is pressed against the tooth bottom of the bevel gear 60, the tip of the probe 3 is positioned on the positioning shaft 8. It is provided so as not to interfere with the front end portion.

  The turntable 7 has a built-in anti-rotation structure. If an operator rotates the turntable 7 and stops it at a predetermined position, then a rotation stop lever (not shown) is slid in the locking direction. The turntable 7 is locked at that position. On the other hand, if the rotation stop lever is slid in the release direction, the lock is released and the turntable 7 can be rotated.

  As shown in FIG. 1, the probe 3 is formed in a rod shape, and its tip is inclined so as to oppose the tooth bottom portion of the bevel gear 60 supported by the support 2 (the tooth bottom portion in the center of the tooth trace direction). Inclined in the direction. The measuring element 3 is formed in a tapered conical shape from the intermediate part to the tip part. Further, as shown in FIG. 3, the tip of the probe 3 has a semi-conical portion 20 with a conical part cut away in a predetermined range in the axial direction so as to avoid interference with the tip of the positioning shaft 8. Is formed. A flat plate portion 20 a is connected to the tip of the semi-conical portion 20. Then, as shown in FIG. 4, the flat plate portion 20a is connected to the inclined surface portions 21a and 21a facing each other, the flat surface portions 21b and 21b ′ facing each other, and the inclined surface portions 21a and 21a and the flat surface portion 21b connected by arcuate surfaces. It is comprised from the circular arc surface parts 21c and 21c. Note that the distance W between the inclined surface portions 21 a and 21 a facing each other is set slightly shorter than the width of the tooth bottom portion of the bevel gear 60.

Then, as shown in FIGS. 1, 4, and 6, the measuring element 3 is configured so that the inclined surface portions 21 a and 21 a of the flat plate portion 20 a face the tooth surfaces adjacent to each other between the tooth profiles of the bevel gear 60. After positioning, the base end is fixed to one end of the slide shaft 22.
As shown in FIG. 1, the slide shaft 22 is inserted into the support block 23 so as to be slidable in the axial direction. The support block 23 is formed in a square shape composed of an upper block 23a and a lower block 23b. Further, the support block 23 is fixed to the base plate 6 on the side of the support base 5 so that a part of the lower block 23b enters the space below the horizontal plate portion 5b of the support base 5. The slide shaft 22 is slidably inserted into the inside of the front block 23c facing the tooth bottom of the bevel gear 60 at the upper block 23a of the support block 23.
As shown in FIGS. 1 and 2, the slide shaft 22 has a displacement plate 24 projecting upward from a portion protruding from the rear surface 23d opposite to the front surface 23c of the upper block 23a. Further, the other end of the slide shaft 22 is connected to the operation lever 25 by a fixing member 26 so that the slide shaft 22 slides linearly when the operation lever 25 rotates.

As shown in FIGS. 1 and 2, the operating lever 25 extends so as to protrude from both side surfaces of the support block 23 with a space from the rear surface 23 d of the upper block 23 a of the support block 23. Further, a portion of the operating lever 25 protruding from one side surface of the support block 23 and a rod-like fixed handle 27 extending in the same direction with a space on the support base 5 side are fixed to the support block 23.
As shown in FIG. 2, a shaft 35 is disposed on the other side surface of the upper block 23a of the support block 23 so as to protrude from the rear surface 23d of the upper block 23a. A spring 36 is disposed substantially parallel to the shaft 35, and one end of the spring 36 is fixed to a rod 37 protruding from one end of the shaft 35, and the other end of the spring 36 is the other end of the operating lever 25. It is fixed to. Further, the operating lever 25 is rotatably supported on the other end of the shaft 35 by a pin 38.

As shown in FIGS. 1 and 2, the position measuring means 4 is constituted by a dial gauge. The dial gauge 4 is arranged on the upper surface of the upper block 23 a of the support block 23 so that the measuring element 30 protrudes from the rear surface 23 d of the upper block 23 a of the support block 23. That is, the dial gauge support block 31 is disposed on the upper surface of the upper block 23 a of the support block 23. The dial gauge support block 31 supports the rod portion 4a of the dial gauge 4, and the dial gauge 4 is disposed on the upper surface of the upper block 23a of the support block 23, and a measuring element 30 that can freely protrude and retract from the rod portion 4a is provided. It protrudes from the rear surface 23d of the upper block 23a.
As shown in FIGS. 1 and 2, the tip of the probe 30 of the dial gauge 4 and the upper part of the displacement plate 24 projecting from the slide shaft 22 are arranged at positions where they can face each other and come into contact with each other. .

Next, a procedure for determining the life of the mold 50 using the mold life determining apparatus 1 configured as described above will be described.
First, the bevel gear 60 molded first time is arranged above the turntable 7 so that each tooth bottom portion faces downward, and the bevel gear 60 is positioned between each tooth profile and each positioning shaft on the turntable 7. The bevel gear 60 is pressed between the fixing tool 9 and the turntable 7 by pressing the bevel gear 60 with the fixture 9.
Subsequently, the rotation stop lever is slid in the release direction so that the rotation table 7 is rotatable, and the rotation table 7 has one tooth bottom portion of all the tooth bottom portions of the bevel gear 60 at the tip of the measuring element 3. It is turned to oppose and locked at that position, and the state shown in FIG. 1 is obtained.

Then, the operating lever 25 is pulled toward the fixed handle 27 from the state shown in FIG. Then, as shown in FIG. 2, the spring 36 extends, the operating lever 25 rotates clockwise around the pin 38 at the lower end of the shaft 35, and the slide shaft 22 moves toward the tooth bottom of the bevel gear 60. As shown in FIG. 5 and FIG. 6A, the tip of the measuring element 3 is pressed against the tooth bottom of the bevel gear 60 as it advances linearly. At the same time, as shown in FIG. 2, the displacement plate 24 projecting from the slide shaft 22 pushes the probe 30 of the dial gauge 4, and the position of the tip of the probe 3 can be measured by the dial gauge 4. .
After the measurement, if the force to the operating lever 25 is released, the spring 36 contracts, the operating lever 25 rotates counterclockwise around the pin 38, and the measuring element 3 moves backward together with the slide shaft 22. Return to position.

  Subsequently, the turntable 7 is sequentially rotated so that each tooth bottom portion of the bevel gear 60 opposes the tip of the measuring element 3, and the above-described operation is repeated, so that all the bevel gears 60 formed at the first time are all rotated. Measure the position of the root in the height direction. This measurement result becomes the reference value of the position in the height direction of each tooth bottom portion of the bevel gear 60.

Next, the fixture 9 is removed, and the bevel gear 60 molded first is removed from the turntable 7.
Subsequently, the bevel gear 60 formed after the second time is set on the rotating table 7 as described above, and the rotating table 7 is configured such that one tooth bottom portion of all the tooth bottom portions of the bevel gear 60 is the measuring element 3. Rotate to face the tip and lock at that position.
Subsequently, when the actuating lever 25 is pulled toward the fixed handle 27, as described above, the tip of the measuring element 3 advances toward the tooth bottom of the bevel gear 60, as shown in FIGS. 5 and 6B. The tip of the probe 3 is pressed against the surplus portion 61 that appears at the bottom of the bevel gear 60, and the position of the tip of the probe 3 in this state can be measured by the dial gauge 4.
Subsequently, the turntable 7 is sequentially rotated so that each tooth bottom portion of the bevel gear 60 is opposed to the tip of the measuring element 3, and the above-described operation is repeated, so that all the bevel gears 60 formed from the second time onward. Measure the position of the tooth bottom in the height direction.

Then, the measured value of the position in the height direction of each tooth bottom portion of the bevel gear 60 molded after the second time and the measured value of the position in the height direction of each tooth bottom portion of the bevel gear 60 molded the first time ( The difference from the reference value is calculated as the amount of displacement in the height direction of each tooth bottom portion of the bevel gear 60 formed after the second time.
As a result, the maximum wear amount in the height direction displacement amount of all the tooth bottom portions of the bevel gear 60 formed after the second time is set in advance, and the limit wear of the tooth tip portion of the mold 50 is preset. The life of the mold 50 can be determined by comparing the amount of displacement with the limit displacement amount in the height direction of the tooth bottom portion of the bevel gear 60 corresponding to the amount.

As described above, according to the embodiment of the present invention, the position in the height direction of each tooth bottom portion of the bevel gear 60 formed at the first time and each tooth bottom portion of the bevel gear 60 formed after the second time. Are measured by the mold life determination device 1 according to the present embodiment, and the height direction of each tooth bottom portion of the bevel gear 60 molded from the second time onward according to each measurement result. The amount of displacement is calculated. Based on this calculation result, that is, the calculation result obtained by quantitatively calculating the progress of the surplus portion 61 appearing at each tooth bottom portion of the bevel gear 60 molded after the second time, each tooth of the mold 50 is obtained. By grasping the increase in the amount of wear at the tip, it is possible to judge its life.
As described above, according to the embodiment of the present invention, based on the calculation result obtained by quantitatively calculating the progress of the surplus portion 61 appearing at each tooth bottom portion of the bevel gear 60 formed after the second time. Since the life of the mold 50 can be determined, the criteria for determining the life of the mold 50 are unified by each worker, the life of the mold 50 can be accurately determined, and the life of the mold 50 can be determined. Can be used effectively up to.

Further, according to the embodiment of the present invention, the maximum displacement amount among the displacement amounts in the height direction of each tooth bottom portion of the bevel gear 60 formed after the second time is plotted for each number of forgings. It is also possible to predict the number of forgings up to the life of the mold 50.
Moreover, according to the embodiment of the present invention, the time for measuring the position in the height direction of each tooth bottom portion of the bevel gear 60 and calculating the amount of displacement is conventionally determined by each tooth profile of the bevel gear 60 by a shape measuring machine. Since the measurement time is measured and compared with the shape of each tooth profile of the reference bevel gear 60, the time required for comparative analysis is greatly shortened. Can do.

  Further, in the mold life judging device 1 according to the embodiment of the present invention, the measuring element 3 is disposed at one place around the bevel gear 60, but the measuring element 3 faces the bevel gear 60. The number of the measuring elements 3 is not limited.

In the mold life judging device 1 according to the embodiment of the present invention, the turntable 7 and the measuring element 3 are operated manually by an operator. However, these operations are automated and each of the bevel gears 60 is operated. You may further simplify the operation | work which measures the position of the height direction of a tooth root part.
Further, in the embodiment of the present invention, the height direction positions of all the tooth bottoms of the bevel gear 60 molded at the first time are measured (reference value), and the bevel gear 60 molded at the second time or later is measured. The position in the height direction of all the tooth bottom portions is measured, and the difference between these measured values is calculated as the amount of displacement in the height direction of each tooth bottom portion of the bevel gear 60 formed after the second time. If the variation in the position in the height direction of each tooth bottom portion of the bevel gear 60 formed at the first time is within a small and allowable range, the height direction of one tooth bottom portion of the bevel gear 60 formed at the first time is within the allowable range. The position is measured, and the measured value is input as a reference value into the dial gauge 4 in advance (the reference value is set to 0), and the height direction of each tooth bottom portion of the bevel gear 60 formed after the second time is measured. Replace the measured position value directly with the displacement amount, The life of the mold 50 have may be determined.

FIG. 1 is a perspective view of a mold life judging apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view seen from the direction A in FIG. FIG. 3 is a side view of the tip of the probe in FIG. FIG. 4 is a front view of the flat plate portion of the probe of FIG. FIG. 5 is a perspective view of a state in which the tip of the probe is pressed against the tooth bottom of the bevel gear. FIG. 6A is a diagram showing a state in which the tip of the tracing stylus is pressed against the tooth bottom portion of the bevel gear formed first, and FIG. 6B is a bulkiness in which the tip of the tracing stylus is molded after the second time. It is a figure of the state pressed against the surplus part which appeared in the tooth bottom part of the gearwheel. FIG. 7 is a view showing a worn state of each tooth tip portion of the mold and an excess portion appearing at each tooth bottom portion of the bevel gear. FIG. 8 is a diagram showing a state in which a limit gauge is pressed against each tooth bottom portion of a bevel gear according to a conventional mold life determination method. FIG. 9 is a diagram showing a state in which the shape of each tooth surface and bottom portion of each tooth profile of the bevel gear is measured by the probe of the shape measuring machine by the conventional mold life determination method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold life judgment apparatus, 2 Support tool, 3 Measuring element, 4 Dial gauge (position measuring means), 50 Mold, 60 Bevel gear

Claims (3)

A mold life judgment device for judging the life of a mold based on a change in shape of a gear after molding,
The mold life judging device includes a support for supporting the gear,
A measuring element that linearly advances and retreats so that the tip is opposed and can be contacted / separated over substantially the entire width direction of the tooth bottom of the gear supported by the support,
Position measuring means for measuring the position of the tip of the probe when the tip of the probe is pressed against the bottom of the tooth,
During the molding by the mold, the position in the height direction of the tooth bottom of each gear sequentially molded by the mold is sequentially measured by the position measuring means, and the tooth bottom of each gear is measured based on the measurement result. A mold life judging device that calculates the progress of the surplus portion that has been revealed and judges the life of the mold.   2. The mold life judging device according to claim 1, wherein the supporting tool supports the gear so as to be rotatable and fixed at an arbitrary tooth position. A mold life judgment method for judging the life of a mold based on a change in shape of a gear after molding,
During molding by the mold, the position in the height direction of each tooth bottom portion of each gear sequentially formed by the mold is contacted and separated with the tip facing the entire width direction of the tooth bottom portion of the gear. Sequential measurement is performed using a probe that linearly moves forward and backward as much as possible, and based on the measurement result, the progress of the surplus portion appearing at the tooth bottom of each gear is calculated, and based on the calculation result. And determining the life of the mold.

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