JP2022161614A - Machined hole inspection device - Google Patents

Abstract

To provide a machined hole inspection device capable of performing inspection regardless of a shape of an object to be inspected.SOLUTION: A machined hole inspection device 10 comprises: a holding part 27 capable of holding a workpiece 50 having a machined hole 51; a base 30 arranged to face the holding part 27; an inspection unit 40 arranged on the base 30; and a reciprocative driving source for reciprocatingly moving one of the holding part 27 or the base 30 toward the other of them. The inspection unit 40 includes: an inspection rod 42 that is arranged on an extension of the machined hole 51 of the workpiece 50 and is configured so that it can be inserted into the machined hole 51; a sliding part 424 for moving the inspection rod 42 in a direction orthogonal to its axis line; a housing 41 for holding the inspection rod 42 and the sliding part 424; and determination means 44 capable of determining whether the inspection rod 42 has been inserted into the machined hole 51.SELECTED DRAWING: Figure 3

Description

The present invention relates to a machined hole inspection machine for inspecting the quality of a machined hole formed in a work.

2. Description of the Related Art Conventionally, as a machined hole inspection machine for inspecting a work having a large number of machined holes, such as an engine or a flow meter, there is known a machined hole inspection machine disclosed in Patent Document 1. This machined hole inspection machine includes inspection rods which are inserted into machined holes formed in a work and configured to be slidable in the axial direction thereof, a base supporting these inspection rods, and the work and the base. and a determination means for determining whether or not the machined hole is appropriate based on the sliding dimension of the inspection rod. In this machined hole inspection machine, when the work and the base are brought close to each other by driving the reciprocating drive source, it is determined whether or not the inspection rod is inserted into the machined hole of the work, or whether or not the insertion depth is specified. Based on whether it is within the range, it is configured to inspect whether the position and depth of the machined hole are appropriate.

JP-A-8-118207

However, conventional machined hole inspection machines only measure the position and depth of the machined hole. There was a problem of judging the suitability. In addition, since the conventional machined hole inspection machine has a configuration in which the inspection rod slides in the axial direction, if the machined holes are displaced in different directions from the reference point, the displacement will be within the allowable error range from the appropriate position. Even with a positional deviation of , the inspection rod sometimes came into contact with the periphery of the machined hole. As a result, there is also the problem that the conventional machined hole inspection machine may erroneously determine a non-defective work to be defective.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hole inspection machine capable of simultaneously inspecting the position of a machined hole and the hole diameter of a down hole. In order to achieve this object, the present invention provides a holding part capable of holding a work in which a machining hole is formed, a base arranged opposite to the holding part, and an inspection device installed on the base. and a reciprocating drive source for reciprocating one of the holding part and the base towards the other. A sliding portion for moving the inspection rod in a direction perpendicular to its axis, a housing for holding the inspection rod and the sliding portion, and a judgment means capable of judging whether or not the inspection rod has been inserted into the machined hole. It is characterized by having In addition, the inspection rod is housed in the housing and includes a collar portion that is sandwiched between the sliding portions in the vertical direction, a shaft portion that is continuous with the collar portion and extends toward the work, and a shaft portion that extends toward the workpiece. and an inspection part provided at the tip of the. Also, the sliding portion is composed of radially arranged steel balls and a retaining plate that retains the steel balls, and the retaining plate is preferably set thinner than the diameter of the steel balls. Furthermore, it is preferable that at least one of the collar portion and the shaft portion or the shaft portion and the inspection portion of the inspection rod is detachable. Moreover, it is preferable that the dimension of movement of the inspection rod in the direction perpendicular to its axis is set to be the same as the allowable dimensional error with respect to the forming position of the machined hole.

According to the machined hole inspection machine of the present invention, since the inspection rod capable of inspecting the hole diameter of the machined hole can be moved by a predetermined amount in the direction perpendicular to the axis, the machined hole formation position and the hole diameter can be inspected at the same time. There are advantages such as being able to The flange of the inspection rod is sandwiched between the sliding parts and held by the housing together with the sliding parts, thereby preventing the inspection rod from tilting, which has the advantage of improving the inspection accuracy. Moreover, since the sliding portion is composed of the steel balls and the retaining plate that retains the steel balls, there is also the advantage that it can be manufactured at a relatively low cost. Furthermore, since the collar, shaft and inspection portion of the inspection rod are detachable, there is an advantage that only the inspection portion that is relatively easily worn can be replaced. Moreover, the dimension in which the inspection rod can move in the direction perpendicular to its axis is the same as the allowable dimensional error for the misalignment of the machined hole. There is also an advantage that it can be manufactured at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially cross-sectional schematic front view which shows the structure of the machined hole inspection machine which concerns on this invention. 1. It is a partially cross-sectional schematic front view which shows the operation|movement which carries out from the state of FIG. 1 to the next state. 1 is an enlarged partial cross-sectional front view of a main part showing the structure of an inspection unit of a machined hole inspection machine according to the present invention; FIG. FIG. 4 is an enlarged partial cross-sectional view of a main part taken along line AA of FIG. 3;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described based on the drawings. 1 to 4, 10 is a machined hole inspection machine for inspecting the workpiece 50. As shown in FIG. This machined hole inspection machine 10 includes an elevating unit 20 for elevating a workpiece 50 received from an external transport mechanism, a base 30 arranged below the elevating unit 20, and an inspection device arranged on the base 30. It has units 40 , 40 ′, 40 ″ and a control section (not shown) that controls driving of the lifting unit 20 . The work 50 is, for example, a cast member having a concave portion formed on its upper surface, and a plurality of machined holes 51, 51', 51'' are formed through it in the vertical direction.

The lifting unit 20 has a driving part 21 that moves up and down by being driven by a reciprocating drive source (not shown). The driving portion 21 is a plate-like member having a gap 22 formed therein, and a reference hole 23 penetrates through the base 30 . A guide shaft 24 extending upward is erected on the driving portion 21 , and a driven portion 26 is mounted on the guide shaft 24 so as to be vertically slidable along the guide shaft 24 . The driven portion 26 is guided by the guide shaft 24 so as not to tilt, and a holding portion 27 is fixed to the lower surface of the driven portion 26 via a connecting member that passes through the gap 22 of the driving portion 21 . . The holding portion 27 is positioned below the main driving portion 21 and is configured to be able to receive the workpiece 50 from a separately provided transfer mechanism (not shown). As a result, as shown in FIGS. 1 and 2 , when the driving portion 21 is driven by the reciprocating drive source to move up and down, the driven portion 26 and the holding portion 27 move up and down in conjunction with the driving portion 21 . Between the driving portion 21 and the driven portion 26, the cushion spring 25, which is an example of a biasing member that always biases the driven portion 26 upward, is provided. Even when the workpiece 50 is held by the holding portion 27, it is set so as not to reach the maximum deflection.

The base 30 is fixed to the frame 11 of the machined hole inspection machine 10 as shown in FIG. The support rod 31 is configured so that the upper surface of the work 50 placed on the support rod 31 is parallel to the base 30, and the length dimension in the vertical direction is adjusted according to the shape of the lower surface of the work 50. is set. Further, the base 30 is provided with a reference rod 32 on an extension line of the reference hole 23 of the driving portion 21 . The reference rod 32 is a rod-shaped member having a conical upper end, and has a diameter substantially equal to that of the reference hole 23 . As a result, when the main moving part 21 descends toward the base 30 during driving, which will be described later, the reference rod 32 is inserted into the reference hole 23, and the main moving part 21 and the base 30 are displaced in the horizontal direction. Positioning is possible so that there is no It should be noted that the reference rod 32 is driven into the reference hole 23 before the inspection rod 42 of the inspection units 40, 40', 40'' described later is inserted into the machined holes 51, 51', 51'' of the workpiece 50. sized to be inserted into the

The inspection units 40, 40' and 40'' are arranged on extension lines of the machined holes 51, 51' and 51'' formed in the workpiece 50, respectively. Although these inspection units 40, 40' and 40'' have heights set to match the machined holes 51, 51' and 51'', they have the same basic configuration. Only the configuration of the inspection unit 40 for inspecting 51 will be described. As shown in FIG. 3, the inspection unit 40 comprises a housing 41 installed on the base 30, an inspection rod 42 held by the housing 41, and a sliding unit for sliding the inspection rod 42 in the horizontal direction. It consists of The housing 41 includes a pedestal 411 that is fixed to the base 30 and has a predetermined dimension in the axial direction, and a substantially cylindrical cylinder that is provided on the pedestal 411 and has a holding hole 413 that penetrates in the vertical direction. It is composed of a portion 412 and a lid portion 414 fixed to the upper side of the cylindrical portion 412 . An insertion hole 415 having a smaller diameter than the holding hole 413 penetrates through the center of the cover part 414 , and the inspection rod 42 is enclosed in the holding hole 413 and then fixed to the cylindrical part 412 by screwing.

The inspection rod 42 is a rod-shaped member that extends vertically, and has a collar portion 421 that is accommodated in the holding hole 413 of the housing 41 and a shaft portion 422 that passes through the insertion hole 415 and extends upward. . A collar portion 421 of the inspection rod 42 has a diameter smaller than that of the holding hole 413 and larger than that of the insertion hole 415 . A pair of holding slides 424 are mounted. On the other hand, the shaft portion 422 is formed with a diameter sufficiently smaller than that of the insertion hole 415 of the lid portion 414 . Therefore, the inspection rod 42 can move horizontally by the dimensional difference between the outer diameter of the flange portion 421 and the hole diameter of the holding hole 413 . The dimensional difference between the flange portion 421 and the holding hole 413 is set based on the allowable error size with respect to the forming position of the machined hole 51, and is set to be the same as the allowable error size. A substantially conical inspection portion 423 is attached to the upper end of the shaft portion 422 . The maximum diameter of the inspection portion 423 is set to be substantially the same as the hole diameter of the machined hole 51 , and the inspection rod 42 has a maximum diameter of the inspection portion 423 when the workpiece 50 comes into contact with the support rod 31 . The length dimension is set so that the diameter portion passes through the machined hole 51 and is located above the upper open end. Furthermore, a cylindrical sealing member 43 is provided in the middle of the shaft portion 422 . The sealing member 43 has an outer diameter larger than the hole diameter of the insertion hole 415 and is arranged at a height such that it can slide along the upper surface of the lid portion 414 . This prevents dust and the like from entering the holding hole 413 .

The sliding portion 424 has a substantially annular holding plate 425 through which the inspection rod 42 is inserted. The retaining plate 425 has an outer diameter set to the same diameter as the outer diameter of the flange portion 421, and as shown in FIG. This accommodation hole is configured so that its diameter is larger than the thickness dimension of the holding plate 425, and inside this accommodation hole, there is a large capacity which is larger than the thickness dimension of the holding plate 425 and is larger than the diameter of the accommodation hole. A steel ball 426 having a slightly smaller diameter is accommodated. The steel ball 426 reduces the contact area between the flange portion 421 of the inspection rod 42 and the pedestal 411 or the lid portion 414 of the housing 41, thereby reducing the frictional resistance generated between them. These structures allow the inspection rod 42 to slide horizontally with respect to the housing 41 . The axial dimension of the collar portion 421 is set so that the steel ball 426 arranged on the upper side contacts the lower surface of the lid portion 414 . Since it is sandwiched between the pedestal 411 and the lid portion 414, the inclination is prevented.

The inspection unit 40 also includes an optical sensor 44 as an example of determination means for determining whether or not the inspection rod 42 has been inserted into the machined hole 51 . The optical sensor 44 projects light from one of the light-projecting portions arranged opposite to each other toward the other light-receiving portion. It is installed at a height that is slightly above its top surface. The control unit determines whether or not the work 50 has reached the contact position with the support rod 31 based on whether or not the light from the optical sensor 44 is blocked by the work 50 . As a result, it is determined whether or not the machined hole 51 formed in the workpiece 50 is formed at an appropriate position and hole diameter through which the inspection portion 423 can pass. Based on the signal from the optical sensor 44, the control unit controls the drive of the reciprocating drive source, the transport mechanism, and the like.

Next, the operation of the machined hole inspection machine 10 configured as described above will be described.
When the work 50 is transported above the base 30 by an external transport mechanism, the controller drives the holding part 27 to receive and hold the work 50 from the transport mechanism. When the holding portion 27 holds the workpiece 50 , the reciprocating drive source is driven to lower the main driving portion 21 and the driven portion 26 toward the base 30 . By inserting the reference rod 32 of the base 30 into the reference hole 23 of the driving part 21 , the driving part 21 is aligned with the base 30 at an appropriate position. After that, the main moving part 21 and the driven part 26 and the work 50 linked thereto are further lowered. A signal (hereinafter referred to as a presence signal) indicating that the work 50 exists between the light projecting part and the light receiving part is output from the sensor 44 to the control part.

After the presence signal is output from the optical sensor 44 as described above, the work 50 is driven by the reciprocating drive source, and when the work 50 is further lowered, the inspection rod 42 is inserted into the machined hole 51 of the work 50 . At this time, since the inspection rod 42 is configured to be movable in the horizontal direction, even if the machined hole 51 is slightly deviated from the reference position, the inspection rod 42 moves horizontally in line with the machined hole 51 and enters the hole. enter in. At this time, since the inspection part 423 is configured in a conical shape, and the inclined surface thereof contacts the edge of the machined hole 51 and slides in the horizontal direction, the machined hole 51 can be smoothly inspected as compared with the case where the upper end is flat. can enter. When the workpiece 50 in this state is further lowered, the inspection part 423 advances through the machined hole 51 and protrudes from the upper opening. Thereafter, the reciprocating drive source lowers the driving portion 21 to the lowest position where the support rod 31 contacts the lower surface of the workpiece 50 as shown in FIG. A signal to that effect (hereinafter referred to as an arrival signal) is output. Further, the optical sensor 44 is installed as described above, and immediately before the lower surface of the work 50 comes into contact with the support rod 31, the work 50 moves out of the space between the optical sensors 44. A signal indicating that the work 50 does not exist between the light projecting section and the light receiving section (hereinafter referred to as a non-existence signal) is output. If the controller receives the absence signal from the optical sensor 44 when it receives the arrival signal from the reciprocating drive source, it determines that the workpiece 50 is non-defective. After this determination, the control unit drives the reciprocating drive source to raise the main moving unit 21 to the initial height, and then drives the conveying mechanism again to receive the work 50 from the holding unit 27 and to determine whether the work 50 is a non-defective product. It is transported to a discharge section (not shown).

On the other hand, if any one of the machined holes 51 is deviated beyond the allowable error range, or if the hole diameter of the machined hole 51 is smaller than the specified hole diameter, the inspection unit 423 detects that the machined hole 51 Since it cannot enter inside, it abuts on the lower surface of the work 50 to support it. At this time, the cushion spring 25 absorbs the impact caused by the work 50 coming into contact with the inspection portion 423, so that the inspection rod 42 and the work 50 are prevented from being damaged. In addition, since the driven portion 26 and the driven portion 21 are connected by the guide shaft 24 so as to be relatively movable in the vertical direction, the work 50 supported by the inspection rod 42, the holding portion 27 for holding the work 50, the driven portion 26, etc. Even if the main moving part 21 stops, only the driving part 21 can be driven by the reciprocating drive source and can descend. At this time, the driven portion 26 and the work 50 are urged upward by the cushion spring 25, and the entire load of the work 50, the driven portion 26, etc. is applied to the inspection rod 42 in contact with the work 50. is prevented and the inspection rod 42 is prevented from bending. When the driving portion 21 descending relative to the workpiece 50 and the driven portion 26 reaches the lowest position, the reciprocating drive source outputs an arrival signal to the control portion. At this time, since the work 50 supported by the detection rod exists between the optical sensors 44, the optical sensors 44 output presence signals. If the controller receives the presence signal from the optical sensor 44 when it receives the arrival signal from the reciprocating drive source, it determines that the workpiece 50 is defective. After this determination, the control unit drives the reciprocating drive source to raise the main moving unit 21 to the initial height, and then drives the transport mechanism again to receive the work 50 from the holding unit 27 and move the work 50 to an undesired position. It is transported to a non-defective product discharge section (not shown).

In this machined hole inspection machine 10, the inspection rod 42 can move horizontally by the allowable error range by the sliding part 424, so the inspection part 423 is configured to have substantially the same diameter as the machined hole 51. can also move corresponding to the positional deviation of the machined hole 51 . This makes it possible to simultaneously inspect the position and depth of the machined hole 51 and the diameter of the hole, thereby making it possible to relatively simplify the configuration of the inspection machine. In addition, since the amount of movement is set to be the same as the allowable error dimension with respect to the forming position of the machined hole 51 as described above, there is no need to separately provide a means for measuring the amount of movement, making it possible to manufacture at low cost. Furthermore, since the sliding portion 424 is composed of the steel balls 426 and the retaining plate 425 that retains the steel balls 426, it can be manufactured at low cost.

The machined hole inspection machine 10 according to the present invention is not limited to the one described above, and various modifications can be made without departing from the scope of the invention. For example, the machined hole inspection machine 10 has a configuration in which the workpiece 50 driven by the reciprocating drive source moves toward the inspection unit 423, but the configuration is not limited to this, and the inspection unit 423 moves toward the workpiece 50. The configuration may be such that Further, the determination means is not limited to the optical sensor 52 as long as it can determine whether or not the inspection rod 42 has been inserted into the machining hole 51. There is no problem in using a contact-type sensor or a position detecting means for detecting the position at which the lifting/lowering driving source is stopped.

Washers made of steel or the like may be arranged between the steel ball 426 and the collar portion 421 and between the steel ball 426 and the base 411 or the lid portion 414 . As a result, excessive force is not applied to the inspection rod 42 and the housing 41 that are in contact with the steel ball 426, so that damage to these can be prevented. Furthermore, even if the washer and steel ball 426 are deformed due to long-term use, only these need to be replaced, so maintenance costs can be reduced compared to replacing the inspection rod 42 and housing 41 . Furthermore, the inspection rod 42 may be configured such that the flange portion 421, the shaft portion 422, and the inspection portion 423 are detachable. As a result, the inspection part 423 can be combined so as to be suitable for the allowable error dimension for the formation position of the machined hole 51 to be inspected, the depth and hole diameter of the machined hole 51, etc., and the inspection part 423 that contacts the machined hole 51 and is relatively easily worn. It is possible to replace only the As a result, there is also the advantage that maintenance costs and the like become inexpensive. Of course, the reference hole 23 is not limited to the driving portion 21, and may be formed in the driven portion 26, the workpiece 50, or the like.

DESCRIPTION OF SYMBOLS 10... Machined hole inspection machine 20... Lifting unit 27... Holding part 30... Base 40... Inspection unit 41... Housing 42... Inspection rod 421... Flange part 422... Shaft part 423... Inspection part 424... Sliding part 425... Holding plate 426... Steel ball 44... Judgment means 50... Workpiece 51... Machined hole

Claims (5)

a holding part capable of holding a workpiece in which a machining hole is formed;
a base arranged to face the holding part;
an inspection unit installed on the base;
a reciprocating drive source for reciprocating either the holding part or the base toward the other;
The inspection unit includes an inspection rod arranged on the extension of the machined hole of the workpiece, a sliding part for moving the inspection rod in a direction orthogonal to the axis, and a housing for holding the inspection rod and the sliding part. and determination means capable of determining whether or not the inspection rod has been inserted into the processed hole. The inspection rod includes a collar portion that is accommodated in the housing and sandwiched between the sliding portions in the vertical direction, a shaft portion that is continuous with the collar portion and extends toward the workpiece, and a tip end of the shaft portion. 2. The machined hole inspecting machine according to claim 1, further comprising an inspecting part provided in the machined hole inspecting machine. Claim 1, wherein the sliding portion is composed of radially arranged steel balls and a retaining plate that retains the steel balls, and the retaining plate is set thinner than the diameter of the steel balls. Or the machined hole inspection machine according to claim 2. 4. The machined hole inspecting machine according to claim 2, wherein at least one of the flange portion and the shaft portion or the shaft portion and the inspection portion of the inspection rod is detachable. 5. A dimension of movement of said inspection rod in a direction perpendicular to its axis is set to be the same as a permissible dimensional error with respect to a position where said machined hole is formed. The machined hole inspection machine described in .

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