JP2015208794A - Honing head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a honing head that allows a grinding stone to be prevented from being widened due to centrifugal force.SOLUTION: A honing head 100 is provided with: a cylindrically-shaped head main body 10; a shoe 20 fitted to the head main body 10 movably in a radial direction; a grinding stone 30 to be attached to an outer peripheral surface of the shoe 20; and a taper cone 40 that is inserted into a shaft P of the head main body 10 and taperedly contacts the shoe 20 and the inside of the shoe 20, where weights 50, which are arranged at opposing positions across the shaft P of the head main body 10, are attached to the shoe 20.

Description

  The present invention relates to a technology of a honing head.

  The honing head is a tool used for honing. Honing is machining that precisely grinds the inner diameter of a workpiece. For example, the inner diameter of an engine cylinder is precisely polished by honing.

  The honing head is inserted into a cylindrical head body, a shoe that is radially disposed on the head body and movable in a direction perpendicular to the axis of the head body, a grindstone that is attached to the outer peripheral surface of the shoe, and a central axis of the head body. A shoe and a tapered cone that makes a taper contact with the inner peripheral surface of the shoe, and the shoe is restrained by the head body by being biased radially inward by a spring.

  By the way, as a means for improving the working efficiency of the honing process, it is conceivable to increase the machining rotational speed of the honing head. On the other hand, in the honing head, centrifugal force acts on the shoe during processing rotation.

  Here, in the low rotation region of the honing head, the biasing force of the spring overcomes the centrifugal force of the shoe, and the restrained state of the shoe with respect to the head main body is maintained. However, in the high rotation range where the number of rotations of the honing head is high, the centrifugal force of the shoe is larger than the biasing force of the spring. Will jump out. Therefore, in the high rotation region of the honing head, there is a possibility that the grindstone hits the work and leads to breakage of the grindstone.

  On the other hand, in the honing head, it is conceivable to increase the spring constant of the spring so that the restraint state of the shoe against the head main body by the spring can be maintained even in a high rotation region. However, if the spring constant of the spring is increased, the work of disassembling the honing head becomes difficult, and a large force is required to expand the grindstone with the taper cone in accordance with the inner diameter of the workpiece. Is not preferable. Therefore, in the honing head, it has been a problem to prevent the grinding stone from spreading due to centrifugal force.

Japanese Patent Laid-Open No. 2000-6001

  The problem to be solved by the present invention is to provide a honing head capable of preventing the grinding stone from spreading due to centrifugal force.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, a cylindrical head body, a shoe attached to the head body so as to be movable in a radial direction, a grindstone attached to an outer peripheral surface of the shoe, and a center of the head body A honing head comprising a shoe inserted into a shaft and a tapered cone that tapers in contact with an inner peripheral surface of the shoe, wherein the shoe is disposed on the opposite side of the head body across the central axis A weight to be attached is attached.

  According to the honing head of the present invention, it is possible to prevent the grinding stone from spreading due to centrifugal force.

The schematic diagram which shows the structure of a honing head. The schematic diagram which shows the structure of a shoe, a connection pin, and a weight. The schematic diagram which shows the structure which connects a shoe and a weight with a connection pin. The schematic diagram which shows the effect | action of a honing head.

  The configuration of the honing head 100 will be described with reference to FIG. In addition, in FIG. 1, the structure of the honing head 100 is represented by the side view of a partial cross section view. Further, on the right side of FIG. 1, the configuration of the honing head 100 is shown in AA sectional view. Further, the following description will be made according to the axial direction, the circumferential direction, and the radial direction shown in FIG.

  The honing head 100 is an embodiment of the honing head of the present invention. The honing head 100 is a tool used for honing. Honing is machining that precisely grinds the inner diameter of a workpiece. The honing head 100 of the present embodiment is for polishing the inner diameter of an engine cylinder.

  The honing head 100 is configured in a substantially cylindrical shape. Here, the central axis of the honing head 100 is defined as an axis P. The honing head 100 includes a head main body 10, a shoe 20, a grindstone 30, a tapered cone 40, and a weight 50.

  The head body 10 is configured in a cylindrical shape. The head main body 10 is formed with a first slit 11, a second slit 12, and a hollow portion 13.

  The first slit 11 penetrates from the outer peripheral side of the head main body 10 to the hollow portion 13 in the radial direction, and is formed along the axial direction of the head main body 10. A plurality of first slits 11 are formed, and are arranged radially in a sectional view of the head body 10. In the present embodiment, five first slits 11 are formed. A shoe 20 is fitted in the first slit 11 so as to be slidable in the radial direction.

  The second slit 12 penetrates from the outer peripheral side of the head main body 10 to the hollow portion 13 in the radial direction, and is formed along the axial direction of the head main body 10. A plurality of second slits 12 are formed, and are arranged radially in a cross-sectional view of the head body 10. The second slit 12 is formed on the opposite side across the axis P of the first slit 11. In the present embodiment, five second slits 12 are formed. A weight 50 is fitted into the second slit 12 so as to be slidable in the radial direction.

  A guide member 16 is attached to the outer peripheral surface of the head body 10. The guide member 16 is disposed along the axial direction on the outer peripheral surface of the head body 10. Further, the guide members 16 are arranged radially in a cross-sectional view of the head body 10. In this embodiment, five guide members 16 are attached.

  The hollow portion 13 is formed in a substantially cylindrical shape along the axial direction of the head body 10. A tapered cone 40 is inserted into the hollow portion 13.

  The tapered cone 40 is configured in a substantially cylindrical shape. Tapered portions 41 and 41 are formed in the middle of the tapered cone 40 in the direction of the axis P so as to have a substantially conical shape. The tapered portions 41 and 41 are formed in a tapered shape whose diameter increases from one side to the other side in the axis P direction (from the left side to the right side in FIG. 1). In the present embodiment, the tapered portions 41 and 41 are formed at two locations along the axis P direction.

  The shoe 20 is attached to the head body 10 so as to be movable in the radial direction. The shoe 20 is attached to the head body 10 by being fitted into the first slit 11 of the head body 10. The same number of shoes 20 as the first slits 11 are provided in the honing head 100. That is, in this embodiment, five shoes 20 are arranged.

  The shoe 20 is configured in a substantially flat plate shape. A grindstone 30 is attached to the outer peripheral surface of the shoe 20. Tapered portions 21, 21 corresponding to the shapes of the tapered portions 41, 41 are formed in portions corresponding to the tapered portions 41, 41 of the tapered cone 40 on the inner peripheral surface of the shoe 20.

  That is, the taper portions 21 and 21 are formed in a tapered shape whose diameter is increased from one side to the other side in the axis P direction at the same angle as the taper portions 41 and 41. The tapered portions 21 and 21 of the shoe 20 are slidably in contact with the tapered portions 41 and 41 of the tapered cone 40.

  As described above, the configuration in which the shoe 20 and the tapered cone 40 are in taper contact with each other makes it possible to move the tapered cone 40 in the axial direction, so that the tapered portions 41 and 41 of the tapered cone 40 and the taper of the shoe 20 are tapered. The contact location with the portions 21 and 21 changes, and the shoe 20 moves in the radial direction (perpendicular to the axis P of the head body 10).

  That is, by moving the taper cone 40 in the axial direction and changing the radial position of the grindstone 30, it is possible to obtain a polishing inner diameter (an inner diameter formed by the grindstone 30) corresponding to the inner diameter of the workpiece to be polished.

  A weight 50 is attached to the shoe 20 so as to be located on the opposite side of the shaft P. The weight 50 is attached to the shoe 20 by connecting the shoe 20 and the weight 50 with a connecting pin 60.

  Engaging portions 22 are formed on the outer peripheral side of the shoe 20 and on both end sides in the axial direction. The engagement portion 22 is fitted with springs 70. That is, the engaging portion 22 that is a recessed portion into which the springs 70 and 70 are fitted is formed along the circumferential direction at corners between the outer peripheral surface of the shoe 20 and both end surfaces in the axial direction.

  The spring 70 fitted to the engaging portions 22, 22... Applies a biasing force toward the inner side in the radial direction to the shoe 20. The shoe 20 is restrained by the head main body 10 by a biasing force toward the inside in the radial direction of the spring 70. Note that the spring 70 can be constituted by, for example, an annular return spring.

  The grindstone 30 is formed in a substantially strip shape, and is attached to the outer peripheral surface of the tapered portion 21 along the axial direction.

  The weights 50 are fitted in the respective second slits 12 of the head body 10 and are arranged radially in a sectional view of the head body 10 in the axis P direction. In this embodiment, five weights 50 are arranged. Note that the weight 50 is sufficiently larger than the total weight of the shoe 20 and the grindstone 30.

  The weight 50 is configured in a substantially flat plate shape. As described above, the weight 50 is attached to the opposite side across the axis P of the shoe 20. The weight 50 and the shoe 20 are connected by a connecting pin 60.

  The configuration of the shoe 20, the weight 50, and the connecting pin 60 will be described with reference to FIG.

  On the left side of FIG. 2A, the shoe 20 is shown in a front view. On the right side of FIG. 2A, the shoe 20 is shown in a side view. As shown in FIG. 2A, a hole 26 is formed in a substantially central portion of the front surface of the shoe 20 from the front surface to the rear surface side. Further, on the front surface of the shoe 20, a groove portion 25 is formed from the hole portion 26 toward the inside in the radial direction.

  On the left side of FIG. 2B, the connecting pin 60 is shown in a front view. Further, on the right side of FIG. 2B, the connecting pin 60 is shown in a side view. As shown in FIG. 2B, the connecting pin 60 is a pin member having a circular shape in cross section, and one end thereof is bent at a right angle. One end side of the bent portion is formed in the short portion 60B, and the other end side is formed in the long portion 60A.

  That is, the connecting pin 60 is configured in a substantially L shape including the long portion 60A and the short portion 60B in front view. A screw portion 61 is formed on the distal end side of the longitudinal portion 60 </ b> A of the connecting pin 60. The short part 60 </ b> B of the connection pin 60 can be inserted into the hole 26 of the shoe 20, and the long part 60 </ b> A of the connection pin 60 can be fitted into the groove part 25 of the shoe 20.

  On the left side of FIG. 2C, the weight 50 is shown in a front view. In addition, the weight 50 is shown in a side view on the right side of FIG. As shown in FIG. 2C, a recess 51 that is recessed from the outer peripheral surface toward the inner peripheral side is formed on the outer peripheral side of the weight 50.

  Further, an engaging portion 52 is formed along the radial direction between the bottom surface of the recess 51 and the inner peripheral surface of the weight 50 on the front side of the weight 50. That is, the engaging portion 52 is a groove portion formed between the bottom surface of the recess 51 on the front surface of the weight 50 and the inner peripheral surface of the weight 50, and the connecting pin 60 can be fitted to the engaging portion 52. ing.

  A configuration in which the shoe 20 and the weight 50 are connected by the connecting pin 60 will be described with reference to FIG. In FIG. 3, the disassembled state before the shoe 20 and the weight 50 are connected by the connecting pin 60 is shown on the left side, and the state where the shoe 20 and the weight 50 are connected by the connecting pin 60 is shown on the right side. .

  A weight 50 disposed on the opposite side of the shoe 20 across the axis P of the head body 10 is attached to the shoe 20. The shoe 20 and the weight 50 are connected by a connecting pin 60 with the tapered cone 40 interposed therebetween. The shoe 20 and the connecting pin 60 are connected by inserting the short portion 60B of the connecting pin 60 into the hole 26 of the shoe 20 and fitting the long portion 60A of the connecting pin 60 into the groove 25 of the shoe 20. ing.

  The weight 50 and the connecting pin 60 are connected as follows. First, the longitudinal portion 60 </ b> A of the connecting pin 60 is fitted to the engaging portion 52 of the weight 50 in a state where the screw portion 61 in the longitudinal portion 60 </ b> A of the connecting pin 60 protrudes into the recess 51 of the weight 50. Next, in the concave portion 51, the strip-shaped stopper 65 is inserted through the longitudinal portion 60 </ b> A of the connecting pin 60, and the weight 66 is fastened to the screw portion 61 of the connecting pin 60 from the outer peripheral side of the stopper 65. And the connecting pin 60 are connected.

  The stopper 65 inserted through the longitudinal portion 60 </ b> A of the connecting pin 60 is configured to be able to be locked to the bottom surface of the recess 51 of the weight 50, and when the stopper 65 is locked to the bottom surface of the recess 51, It is controlled so that the interval with 20 does not become any larger.

  Note that the maximum value of the distance between the weight 50 and the shoe 20 can be adjusted by the fastening position of the bolt 66 in the threaded portion 61. Even when the shoe 20 is located on the innermost radial direction, the weight 50 can be adjusted. The fastening position of the bolt 66 and the thickness of the stopper 65 are adjusted so that they do not protrude from the outer peripheral surface of the guide member 16 to the outer peripheral side.

  The operation of the honing head 100 will be described with reference to FIG. In FIG. 4, the operation of the honing head 100 is shown in a partial cross-sectional side view.

  Since the weight of the weight 50 is sufficiently larger than the total weight of the shoe 20 and the grindstone 30 in the shoe 20 and the weight 50 connected by the connecting pin 60 of the honing head 100, (G in FIG. 4) is located closer to the axis P than the weight 50. Hereinafter, in order to consider the centrifugal force acting on each of the shoe 20 and the weight 50, the shoe 20 and the weight 50 are considered as separate systems.

  When the honing head 100 rotates, centrifugal force acts on the shoe 20 and the weight 50, respectively. Here, the centrifugal force acting on the shoe 20 is referred to as centrifugal force Fa, and the centrifugal force acting on the weight 50 is referred to as centrifugal force Fb. Since the shoe 20 and the weight 50 are disposed at positions facing each other across the axis P, the centrifugal force Fa and the centrifugal force Fb are forces acting in opposite directions.

  When the honing head 100 rotates, the weight 50 is sufficiently larger than the total weight of the shoe 20 and the grindstone 30, so that the centrifugal force Fb acting on the weight 50 is greater than the centrifugal force Fa acting on the shoe 20. Also grows.

  When the centrifugal force Fb acting on the weight 50 becomes larger than the centrifugal force Fa acting on the shoe 20, the centrifugal force Fa acting on the shoe 20 is canceled out, and the spread of the shoe 20 to the outer peripheral side by the centrifugal force Fa is prevented. Is done.

  The effect of the honing head 100 will be described. The honing head 100 can prevent the grinding stone 30 from spreading due to the centrifugal force Fa of the shoe 20. As a result, even if the honing head 100 is rotated in the high rotation region, the honing process can be performed stably.

  That is, according to the honing head 100, the weight 50 is attached to the opposite side across the axis P of the shoe 20, and the centrifugal force Fa acting on the shoe 20 is canceled, thereby increasing the urging force of the spring 70 against the shoe 20. Without spreading, the grindstone 30 can be prevented from spreading due to the centrifugal force Fa of the shoe 20.

10 head body 20 shoe 30 grindstone 40 taper cone 50 weight 100 honing head

Claims (1)

A cylindrical head body;
A shoe attached to the head body to be movable in a radial direction;
A grindstone attached to the outer peripheral surface of the shoe;
A taper cone inserted into the central axis of the head body and in taper contact with the inner peripheral surface of the shoe;
A honing head comprising:
A weight disposed on the opposite side of the central axis of the head body is attached to the shoe.
Honing head.

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