JPH11118463A - Manufacture of parts and dimensional inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for quickly inspecting a number of parts for dimensions by permitting automatic inspection without depending on humans, when the parts are inspected for dimensions according to whether or not a gage can be engaged with the parts, and provide techniques whereby more accurate inspection is made possible by preventing dispersion in the inspection. SOLUTION: Support 26 is upwardly engaged with a frame plate, and guide shafts 27 are surely attached to the support 26 and freely slidably passed through a horizontal plate 22. Wire 42 is connected to the upper surface of the support 26 via a mounting shaft 41 and secured to a pair of weight shafts 45, 55 and a weight plate 46 which are placed therebehind. A guide support plate 24 is fixed in place above the horizontal plate 22, and the drive rod 31a of a driving motor 31 fixed in place thereabove is connected to a drive shaft 33, extends below the guide support plate 24, and has a columnar gage 35 surely attached thereto by a bracket 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component manufacturing method and a component size inspection apparatus.

[0002]

2. Description of the Related Art Conventionally, dimensional inspection of parts has been performed before shipping parts manufactured by various methods or before using parts received from other places. When inspecting the dimensions of a part, there are a case where a sampling inspection is performed and a case where a 100% inspection is performed. In particular, in the case of parts that require precise shape accuracy, 100% inspection is performed, and it is necessary to scrutinize dimensions, shapes, and the like for each part.

FIG. 8 is a perspective view of a stator core 1 of a stepping motor. The stator core 1 has a structure in which a plurality of core pieces 10 made of a magnetic material are stacked. Each core piece 10 is formed in advance into a planar shape as shown in the drawing by progressive press working, and then another core piece 10 is further superimposed on the core piece 10 to form the caulked portion 1 shown in the figure.
In step 4, the process of fitting and fixing by performing half blanking is repeated, and a large number of core pieces 10 are sequentially fixed to each other, whereby the stator core shown in the figure is formed.

[0004] The stator core 1 has an outer frame portion 11 formed on the outer peripheral portion, a bridge portion 12 projecting inward from the inner peripheral surface of the outer frame portion 11, and eight magnetic poles formed at the tip of the bridge portion 12. A part 13 is provided. On the inner peripheral edge of the magnetic pole portion 13, a surface irregularity formed by peak portions 13 a and groove portions 13 b alternately formed in the rotation direction of a rotor (not shown) is formed. The region surrounded by these eight magnetic pole portions 13 is just a substantially circular inner hole 16,
The rotor (not shown) is arranged inside the inner hole 16.

The inner diameter of the inner hole 16 of the stator core 1 is the most important factor that determines the magnetic characteristics of the motor structure. If the inner diameter of the inner hole 16 is not accurately formed, the gap between the stator and the rotor (not shown) will be increased. Since the motor is not formed as set, predetermined driving characteristics of the motor cannot be obtained. However, the inner diameter of the stator core 1 is
Since the accuracy of the inner diameter of 0 and the positional accuracy of the core pieces 10 in the plane direction at the time of lamination are affected, even if each of the core pieces 10 can be formed with high precision by pressing, each core piece 10 at the time of lamination is formed. There may be a case where an inner diameter smaller than a desired value is obtained due to a difference between the two.

[0006] The inner diameter of the inner hole 16 of the stator core is individually inspected after the stator core 1 is formed. The inner diameter inspection of the stator core 1 is usually performed by manually inserting a columnar gauge (or a pin gauge) into the inner hole 16 of the stator core. The columnar gauge has a columnar shape having an outer diameter substantially equal to that of the inner hole 16, and has a slightly reduced diameter at the front end. The columnar gauge includes a through gauge and a stop gauge. The through gauge has an outer diameter close to or below the lower limit of the allowable range of the inner diameter of the inner hole 16, and a stator core through which the through gauge can be inserted becomes a good product, and a stator core through which the through gauge cannot be inserted becomes defective. Also,
The stop gauge has an outer diameter close to or above the upper limit of the allowable range of the inner diameter of the inner hole 16, and a stator core that cannot pass the stop gauge is a good product, and a stator core that can pass the stop gauge is defective. Become.

[0007]

The internal diameter inspection of the inner hole 16 of the above-mentioned conventional stator core is a part that requires particularly high precision, so it is necessary to carry out a 100% inspection without being sufficient for a sampling inspection. Since the inspection is performed manually, there is a problem that the inspection labor becomes a heavy burden and a quick inspection cannot be performed. In particular, the work of inserting the columnar gauge into the inner hole 16 of the stator core is performed by using the inner hole 16.
The more the tolerance of the inner diameter of the press becomes narrower, the more difficult it is for an unskilled person to perform the inspection itself.Also, even a skilled person takes time, so it is impossible to perform the inspection according to the line speed of the press device. Become.

In addition, when the inspection is performed manually, the method of inserting the columnar gauge and the insertion strength vary from person to person, which causes a problem in inspection accuracy. For example, even with a stator core having an inner diameter smaller than the outer diameter of the columnar gauge, if the columnar gauge is pushed in with a large force, the inner edge of the stator core is once deformed and the columnar gauge is inserted into the inner hole 16, After a while, the inner diameter of the inner hole 16 may be reduced and returned to its original state for a while after the removal.
In such a case, even if the stator core has passed the inspection, a defect may be found during re-inspection at the time of use, or an operation failure may occur after assembly. Conversely, there may be a case where the stator core is originally capable of inserting the columnar gauge but cannot be inserted due to a problem with the insertion skill of the columnar gauge.

Accordingly, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to perform a dimensional inspection based on whether a gauge can be engaged with a part or not, without performing manual inspection automatically. To provide a method and apparatus for quickly inspecting the dimensions of a large number of parts by performing the inspection, and to prevent the dispersion of the inspection and to perform a more accurate inspection. It is in.

[0010]

Means taken by the present invention to solve the above-mentioned problem is that, after forming a part having a through hole or a concave hole, a gauge member is inserted into the through hole or the concave hole of the part. A method of manufacturing a part for inspecting whether or not insertion is possible and separating non-defective products, wherein the insertion into the through-hole or the concave hole so that stress of a predetermined value or more is not applied between the part and the gauge member. It is characterized by trying.

According to this means, when the gauge member is to be inserted into the through-hole or the concave hole of the component, a stress of a predetermined value or more is not applied, so that deformation or damage of the component does not occur. The shape and dimensions of the through hole or the concave hole can be inspected accurately and with good reproducibility.

Here, the inspection is performed such that at least one of the component and the gauge member is evacuated from the other before a stress equal to or more than the predetermined value is applied between the component and the gauge member. Is preferred.

According to this means, at least one of the component and the gauge member is retracted from the other before a stress equal to or more than a predetermined value is applied, so that the gauge insertion load can be reliably limited.

In this case, a support is provided for supporting one of the component and the gauge member in a direction toward the other, and the support is limited to less than the predetermined value toward the other. It is desirable that the one and the other approach each other in a state where a stress is applied.

According to this means, either the component or the gauge member is supported by the support, and the stress applied to the support is limited to less than a predetermined value, so that the inspection can be performed with a simple apparatus configuration. Can be.

Preferably, the stress is adjusted by a weight connected to the support.

According to this means, since the stress is adjusted by the weight, it can be constituted by a simple stress applying mechanism and can apply a stable stress.
In addition, the stress can be easily and reliably limited.

Further, when at least one of the component and the gauge member is retracted from the other, it is desirable to determine that the gauge member could not be inserted and to perform an inspection.

According to this means, it is possible to easily and reliably detect the inspection result by determining whether or not the gauge member can be inserted based on whether one of the component and the gauge member is retracted. Here, one evacuates from the other when one is actively moving on its own, or
This includes any case in which one is driven to move by the pressing of the other.

In each of the above means, the component may be a laminated core for a motor having an inner hole. The laminated core for a motor is particularly important because it is difficult to obtain the accuracy of the inner hole diameter because a large number of core pieces are laminated, and the variation in the inner hole diameter greatly affects the motor characteristics.

Next, there is provided an apparatus for inspecting the dimensions of a component based on whether or not a gauge member is engaged with the component, comprising: a support for supporting one of the component and the gauge member toward the other; A moving mechanism for configuring any one or the other of the component and the gauge member supported on a support so as to be able to approach and separate from each other, and the support is provided on the other of the component and the gauge member. A holding unit configured to be movable on the side opposite to the heading direction and to hold the support with a limited position holding force, even if the component and the gauge member are engaged by movement by the movement mechanism. The present invention is characterized in that a stress greater than a predetermined value is not applied between the component and the gauge member.

According to this means, when the gauge member is to be engaged with the component, no stress of a predetermined value or more is applied, thereby preventing the deformation and damage of the component without causing any deformation or damage of the component. The shape and dimensions can be inspected accurately and with good reproducibility.

In this case, in order to facilitate supply and discharge of the components, it is practical to support the components on a support and move the gauge member toward the components. is there.

The holding means includes a guide mechanism for guiding the support in a direction in which the component and the gauge member, which are separated from each other, face each other, and one of the component and the gauge member. It is preferable that a stress applying mechanism for applying a stress toward the first member and a regulating frame for regulating movement of the supporting member toward one of the component and the gauge member be provided.

[0025] In this case, the stress applying mechanism is connected to the support and is provided with a traction member erected along a predetermined path. The traction member is attached to a substantial tip of the traction member and hangs down. It is desirable that a weight body be provided.

[0026] It is preferable that the apparatus further comprises a detecting means for detecting the movement of the support toward the other side of the component and the gauge member.

Further, when biting occurs when the component and the gauge member are engaged with each other, the bite engages with one of the component and the gauge member to separate the component from the gauge member. Is preferably disposed between the component and the gauge member which are separated from each other. Even when the stripper member bites between the component and the gauge member and bites or the like occur, the stripper member easily bites and releases biting by engaging with one of the components when the component and the gauge member separate from each other. .

The moving mechanism is provided with a driving source such as a linear motor, an air cylinder, a hydraulic cylinder, and a cam mechanism for driving the component and the gauge member so as to contact and separate from each other. Is preferred.

Here, it is desirable that the driving source is a linear motor. Since the linear motor can highly control the speed and position accuracy in the contact and separation directions, the inspection accuracy can be improved.

[0030] Further, it is preferable that the gauge member is provided with a tip introduction portion tapered toward the component and an inspection surface portion formed behind the tip introduction portion. Since the positional deviation between the component and the gauge member can be automatically corrected by the tip introducing portion, the inspection accuracy can be improved.

[0031] In this case, the tip introduction portion may further include:
It is preferable that an inclined surface whose inclination angle gradually decreases from the tip toward the inspection surface is provided. By gradually decreasing the inclination angle of the inclined surface, it is possible to achieve both the correction of the positional deviation between the component and the gauge member and the reduction of the introduction resistance.

In this case, it is effective that a plurality of inclined surfaces having mutually different inclination angles are connected to the tip introducing portion. In this case, it is possible to suppress variations in test results and a decrease in reproducibility caused by familiarity between the component and the gauge member.

[0033] The tip introduction portion may be formed in a shell shape. Here, the cannonball shape is a shape in which the inclination angle is continuously reduced from the tip toward the inspection surface portion, and in particular, the displacement between the component and the gauge member can be smoothly corrected, and the shape of the component can be improved. The introduction resistance can be further reduced.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for manufacturing a part and an apparatus for inspecting the dimensions of a part according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a vertical cross-sectional view showing a cross section of a stator core inner diameter inspection device of the present embodiment viewed from the right side, and FIG. 2 is a vertical cross-sectional view showing a cross section viewed from the front. 1 and 2, the transport mechanism for transporting the stator core connected to the apparatus is not shown.

The left and right two side plates 21 are fixed to the base 20, and the horizontal plate 22 is fixed to the side plates 21. To the horizontal plate 22, a frame plate 25 disposed at an interval above is fixed by a support leg 25a. Frame plate 2
A support 26 is engaged with the upper part 5 in the upward direction, and four guide shafts 27 are attached and fixed to the support 26. These guide shafts 27 are slidably inserted through perforations formed in the horizontal plate 22 via guide bushes 22a.

On the upper surface of the support 26, wires 4 are attached to the front left side and the rear right side via mounting shafts 41 and 51, respectively.
2, 52 are connected, and these two wires 4
The reference numerals 2, 52 penetrate through holes formed in the guide support plate 24 and are connected to a pair of weight shafts 45, 55 disposed rearward via upper pulleys 43, 44, 53, 54. . The weight shafts 45 and 55 are respectively inserted into two through holes formed in the upper part of the weight frame 47, and both are fixed to the weight plate 46 below them.

Three columns 23 are erected on the upper surface of the horizontal plate 22, and a guide support plate 24 is fixed to the upper ends of these columns. A drive motor 31 is fixed above the guide support plate 24 via a support (not shown), and a drive rod 31 a of the drive motor 31 is connected to the floating joint 3.
2, and is connected to the drive shaft 33. The drive shaft 33 is slidably inserted into a through hole of the guide support plate 24 via a guide bush 24a, extends below the guide support plate 24, and has a columnar gauge 35 attached and fixed by a bracket 34. The columnar gauge 35 is configured to be able to move up and down with high precision because the drive shaft 33 is guided in the vertical direction with high precision by the through hole of the guide support plate 24.

The drive motor 31 can be a normal rotary motor provided that a motion converting mechanism such as a crank, a cam, a ball screw or the like is interposed. However, the drive rod 31 can be driven without being affected by the mechanism accuracy. It is preferable to use a linear motion motor capable of directly moving the 31a up and down. Among them, instead of providing a rotor such as a stepping rotary motor, instead of forming a plurality of magnetic pole teeth in the axial direction inside a cylindrical stator, a magnetized mover having a plurality of magnetic pole teeth in the axial direction is used as an axial line. The movable rod is housed so as to be slidable in the direction and a magnetic field is generated in the magnetic pole teeth of the mover by forming a winding.
It is preferable to use a linear stepping motor capable of accurately and directly moving 1a in the axial direction in order to improve the driving accuracy. In this case, since the columnar gauge 35 can be moved with high accuracy without rotating the drive shaft 33, it is not affected by bending of the drive shaft 33 or the like.
The columnar gauge 35 can be lowered straight.

A rear plate 28 is provided on the rear upper surface of the guide support plate 22.
Is fixed indirectly to the rear plate 28.
9 is fixed, and a ring-shaped stripper ((biting release plate)) 37 is attached to a lower portion of the mounting plate 29. The stripper 37 has an opening having an inner diameter through which the columnar gauge 35 can be inserted with a margin. A detection pin 57 is attached to the lower surface of the support 22, and an upper sensor 58 and a lower sensor 59 are arranged below the detection pin extending therefrom. When 57 descends and reaches the sensor position, it is optically detected.

FIG. 3 is a plan view showing the periphery of the inspection section of the stator core in the above-described apparatus. Frame plate 25 and support 2
6, the introduction conveyance path A for feeding the stator core 1 to the inspection position set on the upper surface of the support 26, and the stator core 1 from the inspection position, as shown by a two-dot chain line. Outgoing transport paths B and C for sending out are provided. For example, the outgoing transport path B is for sending out good products, and the outgoing transport path C is for sending out defective products.

The stator core 1 supplied onto the introduction conveyance path A is sequentially pushed out to the right end of the introduction conveyance path A by a piston rod (not shown). The extruded stator core 1 is extruded by the piston rod of the cylinder 61 to an inspection position X on the support 26 in a direction orthogonal to the previous conveying direction. When the piston rod of the cylinder 61 is retracted, the pair of positioning members 6
2 sandwiches the stator core 1 and accurately positions it at the center of the inspection position X. When the positioning is completed, the positioning member 62 is retracted, the drive motor 31 is moved to lower the columnar gauge 35 from above, and the columnar gauge is moved to the stator core 1.
Through the inner hole.

Here, since the stator core 1 is placed in a free state without being fixed at the inspection position X on the support 26, the inclination provided at the leading end introduction portion of the columnar gauge 35 will be described later. The surface allows the stator core 1 to move horizontally on the support 26, so that any misalignment between the columnar gauge 35 and the inner hole 16 of the stator core 1 is automatically corrected. When the inspection is completed, the columnar gauge 35 is raised. As a result of the inspection, when the stator core 1 is a non-defective product, the stator core 1 is pushed out to the lead-out conveyance path B by the piston rod of the cylinder 61. If the stator core 1 is defective, the stator core 1 is pushed out to the lead-out transport path C by the piston rod of the cylinder 63. Detailed operations during the inspection will be described later.

As shown in FIG. 3, two mounting shafts 41 and 51 are mounted on the support 26 engaged with the frame plate 25 at two diagonal positions around the inspection position X of the stator core 1. From each of these diagonal positions.
2, 52 are drawn upward. Mounting shaft 41,5
1 is an introduction conveyance path A and a derivation conveyance path B of the stator core 1,
C is set at a position that avoids the inside of C. In particular, by attaching the mounting shafts at the diagonal positions as described above, the mutual interval between the two mounting positions can be maximized. When a traction stress is applied from the weight composed of the weights 45, 55 and the weight plate 46, the stability can be improved, and the sliding resistance of the support 26 can be reduced. The towing position may be one or three or more.

4 and 5 show the shape of the columnar gauge 35. FIG. In this columnar gauge 35, a tip portion 35a having a chamfer formed from the tip surface to the R surface, and a first inclined surface portion 35b formed following the tip portion 35a
A second inclined surface portion 35c formed following the first inclined surface portion 35b, an inspection surface portion 35d having a constant outer diameter formed following the second inclined surface portion 35c, and formed following the inspection surface portion 35d. Mounting fixing portion 35e is provided. Here, the tip portion 35a, the first inclined surface portion 35b, the second
The inclined surface portion 35c constitutes a leading end introduction portion.

In the case of the present embodiment, when the diameter of the columnar gauge 35 is about 25 mm, the curvature of the chamfer of the tip 35a is 1 mm, and the length of the first inclined surface 35b in the axial direction is 10 m.
m, the inclination angle θb is 2 degrees, the axial length of the second inclined surface 35 c is 5 mm, the inclination angle θc is 1 degree, and the inspection surface 35 d
Is 20 mm in the axial direction.

The leading end portion consisting of the leading end portion 35a, the first inclined surface portion 35b and the second inclined surface portion 35c is a columnar gauge 35.
Is inserted smoothly into the inner hole 16 of the stator core 10, and is configured such that the columnar gauge 35 can be inserted without any trouble even if there is slight misalignment of the stator core 10. The larger the inclination angles of the first inclined surface portion 35b and the second inclined surface portion 35c, the larger the misalignment between the columnar gauge 35 and the inner hole 16 of the stator core 1 can be dealt with. Since the stress for pushing down downward becomes large, the inclination angle θb of the first inclined surface portion 35b on the distal end side is made slightly larger, and the inclination angle θc of the second inclined surface portion 35c is made small, so that the columnar gauge 35 can be smoothly placed. This makes it possible to achieve both the proper insertion and the reduction of the insertion resistance of the columnar gauge 35. In the present embodiment, the inspection can be performed stably by adopting the shape in which the inclination angle is reduced in a plurality of steps as described above. In the present embodiment, two steps are provided. However, the number of steps may be three or more, and the above effects can be obtained if there are a plurality of steps.

In this case, for example, it is also possible to work into a shell shape so that the inclination angle gradually decreases continuously from the tip. By doing so, the position of the column gauge with respect to the stator core can be corrected smoothly, and the introduction resistance of the column gauge can be reduced.

The outer peripheral surface of the inspection surface portion 35d forms an inspection surface of a columnar gauge having a regular outer diameter. The inspection of the inner diameter of the inner hole 16 can be performed by inserting the inspection surface portion 35 d into the inner hole 16 of the stator core 1. When the columnar gauge 35 is a through gauge, the lower limit of the allowable range (tolerance) of the inner diameter of the inner hole 16 or an outer diameter close to this, for example, 2
The outer diameter is 4.995 mm, and when the columnar gauge 35 is a stop gauge, the outer diameter is set to the upper limit of the allowable range of the inner diameter of the inner hole 16 or an outer diameter close to the upper limit, for example, 25.025 mm.

Next, the inspection status and the operation of the apparatus of the above embodiment will be described. Stator core 1 is at inspection position X
, The tip of the columnar gauge 35 descends and is introduced into the inner hole 16 of the stator core 1 on the support 26 through the stripper 37. Then, the inner diameter of the inner hole 16 of the stator core 1 is
When the outer diameter is 5d or more, the columnar gauge 35 is inserted through the stator core 1 as shown in FIG. 6, and the inspection surface 35d is completely inserted into the inner hole 16. At this time, the support 26
Does not descend and remains as it is. Here, when the column gauge 35 starts to be inserted into the inner hole of the stator core 1, the misalignment between the column gauge 35 and the stator core 1 is caused by the tip 35a, the first inclined surface 35b, and the second inclined portion of the column gauge 35. The stator core 1 itself is corrected by moving on the surface of the support 26 in accordance with the leading end introduction portion composed of the surface portion 35c. At this time, if there is friction or catch between the outer peripheral surface of the distal end of the columnar gauge 35 and the opening edge of the inner hole of the stator core 1, the support 26 falls, and the shape of the columnar gauge 35 or the surface friction coefficient or It may be necessary to adjust the descent speed as described below.

On the other hand, when the inner diameter of the inner hole 16 of the stator core 1 is smaller than the outer diameter of the inspection surface 35 d of the columnar gauge 35, the first inclined surface 35 b and the second inclined surface 35 c are moved from the tip 35 a of the columnar gauge 35. When any portion of the portion reaching the inspection surface portion 35d through the hole reaches the opening edge of the inner hole 16, the inner hole 16 is caught by the columnar gauge 35, so that the columnar gauge 35 descends as shown in FIG. Accordingly, the support 26 also descends against the weights of the spindles 45 and 55 and the weight plate 46, and this descending state is caused by the detection pins 57 reaching the positions of the upper sensor 58 and the lower sensor 59. Is detected. By the lowering of the detection pin 57, a control circuit (not shown) can obtain a result indicating whether or not the columnar gauge 35 can be inserted.

Here, the upper sensor 58 and the lower sensor 59
Therefore, various detections are possible by changing the sensor arrangement. For example, the upper sensor 58 can be used to detect whether the support 26 has returned to the correct position, and the lower sensor 59 can be used to detect that the support 26 has dropped. In addition, it is possible to prevent detection leakage by judging whether or not insertion is possible by detecting either the upper sensor 58 or the lower sensor 59, or it is possible to prevent insertion by detecting both the upper sensor 58 and the lower sensor 59. Erroneous detection can be prevented by judging whether or not.

As shown in FIG. 7, when the outer diameter of the columnar gauge 35 is almost the same
For example, when the misalignment with the stator core is not properly corrected, the columnar gauge 35 may bite or bite into the inner hole of the stator core 1 and may not come off. In such a case, the columnar gauge 3
If the user 5 attempts to retract upward from the state shown in FIG.
The stator core 1 is raised together with the columnar gauge 35. In the present embodiment, the stripper 37 is disposed slightly above the stator core 1, and the stripper 37 is fixed at a predetermined height position. Engagement stops the rise and acts to remove the stator core 1 from the columnar gauge 35.

Here, the stripper 37 has a columnar gauge 35.
There is an opening that allows you to insert
Bars, fences,
It can be formed into various shapes such as a rectangular frame shape, a ladder shape, and the like, which have a function of catching on the stator core that is going to rise together with the columnar gauge 35 and sweeping off the stator core.

With respect to the determination as to whether or not the column gauge 35 can be inserted, the type of the driving means, the presence or absence of rotation of the column gauge, the difference in the descending speed of the column gauge, the weight of the support and the weight, the guide structure and material of each part, etc. Various experiments were conducted to investigate the influence on the difference in gauge insertion load and the like.

As a result, there was no particular problem with any of the air cylinder, the hydraulic cylinder, and the linear stepping motor as the driving means, and good results were obtained. However, when an air cylinder is used, the drive shaft protrudes 9
Since it rotates 0 degrees, the insertion state changes due to this rotation, so that it is necessary to change the outer diameter of the columnar gauge compared to the case where a linear stepping motor in which the drive shaft does not rotate is used.
Numerically speaking, when an air cylinder is used, the lower limit of tolerance tends to be smaller by about 2 to 3 μm than when a linear stepping motor is used. In consideration of the deviation of the drive shaft due to the rotation of the drive shaft, it is considered preferable to use a drive source that does not rotate the drive shaft from the viewpoint of inspection accuracy and reproducibility of inspection.

When the linear stepping motor was used, the lowering speed of the columnar gauge was in the range of about 10 to 90 mm / sec without any problem, and there was almost no erroneous determination. However, erroneous determination was not found at all within the range of 30 to 60 mm / sec, and the inspection could be performed relatively quickly.

The gauge insertion load corresponds to the maximum stress applied between the stator core 1 and the column gauge 35 when the column gauge is inserted into the inner hole. The gauge insertion load is determined by its own weight (stator core weight: about 62 g) as a conventional manual inspection standard of the stator core. However, this is only a tentative standard because the effect of the insertion load is considered to vary depending on the rigidity, size, shape, and other conditions of the material of the stator core. In the above device, the gauge insertion load is determined by the difference between the sum of the weight of the support 26 and the self-weight of the stator core, which is the part to be inspected, and the weight of the weight composed of the spindle and the weight plate and the frictional resistance of the support 26. You. In the case of the above device, since the stator core 1 is placed on the support 26, if the weight balance between the support 26 and the weight is subtracted by the weight of the stator core 1 beforehand, a desired insertion load can be obtained. Is obtained.

In practice, the gauge insertion load is set to 60 to 250
g, the stability was slightly lacking in the light load region near the self-weight of 62 g of the stator core 1, and the gauge was easily inserted in the heavy load region. Since the upper limit and the lower limit of the diameter are reduced, it is the most stable in the case of the present embodiment that the accuracy of the determination result is about 90 to 120 g.

Here, it is preferable to reduce the unstable frictional resistance as much as possible. In the present embodiment, the guide shaft of the support 26 is constituted by a bearing instead of a guide bush, for example, up to about 70 to 80 g. The reduced frictional resistance could be reduced to 35 to 40 g. In addition, since it is desirable to reduce the inertia of the movable part as much as possible in order to increase the inspection sensitivity, in the present embodiment, the weight of the support 26 and the weight is reduced as much as possible by using a lightweight material such as aluminum to balance. As a result, the detection sensitivity could be improved.

The above-described stress applying mechanism including the support 26, the guide shaft 27, the wires 42 and 52, the weight shafts 45 and 55, the weight plate 46, and the like can be constituted by other structures. For example, the support 26 may be a spring (spring) such as a coil spring.
It can also be configured by urging using other elastic members or using a fluid pressurizing mechanism such as a hydraulic damper. However, in terms of stability when the position of the support 26 is held, the method using the gravity of the above embodiment is the best, and the variation in inspection accuracy is reduced.

In the above embodiment, since the stress applying mechanism is provided, the inspection can be performed with the gauge insertion load kept constant, so that the variation in the inspection can be reduced, and the reproducibility and stability can be improved. . Further, since the gauge insertion load can be set freely, it is possible to select an optimum gauge insertion load with respect to inspection accuracy and stability according to the inspection object. Further, since the gauge insertion inspection can be performed automatically, the inspection can be performed quickly without the need for manual operation.

In the above embodiment, the inspection of the inner hole diameter of the stator core has been described. However, it is also possible to inspect other parts having through-holes or concave holes by using exactly the same method or apparatus. Furthermore, even if it is not a dimensional inspection of a through hole or a concave hole of a part, various shapes and structures can be obtained by contacting the gauge member with the part and checking whether the gauge member is engaged with any part of the part. Of various parts of the part can be inspected. At this time, the shape of the gauge member is also different, and it may be necessary to fix the part at the inspection position, but in any case, the main parts of the above embodiment, such as the holding structure of the support 26 and the stress applying mechanism, etc. Can be adopted almost as it is.

[0063]

As described above, according to the manufacturing method of the present invention, when a gauge member is to be inserted into a through-hole or a concave hole of a component, a stress of a predetermined value or more is not applied. It is possible to accurately and reproducibly inspect the shape and dimensions of the through hole or the concave hole without causing deformation or damage of the through hole.

Further, according to the dimensional inspection apparatus of the present invention, when the gauge member is to be engaged with the component, no stress exceeding a predetermined value is applied, thereby preventing the component from being deformed or damaged. The shape and dimensions of each part of the component can be inspected accurately and with good reproducibility.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing the structure of an embodiment of a dimension inspection apparatus according to the present invention, as viewed from a right side.

FIG. 2 is a longitudinal sectional view of the structure of the embodiment as viewed from the front.

FIG. 3 is a plan view showing a structure around an inspection position in the embodiment.

FIG. 4 is a side view showing the shape of the column gauge in the embodiment.

FIG. 5 is an enlarged side view showing the shape of the distal end side of the columnar gauge in the embodiment.

FIG. 6 is a partial cross-sectional view showing a state where the columnar gauge according to the embodiment is inserted into a stator core.

FIG. 7 is a partial cross-sectional view showing a state where the columnar gauge according to the embodiment cannot be inserted into a stator core.

FIG. 8 is an enlarged perspective view showing a structure of a stator core to be inspected in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator core 22 Horizontal plate 24 Guide support plate 25 Frame plate 26 Support body 27 Guide shaft 31 Drive motor 33 Drive shaft 35 Column gauge 37 Stripper 42,52 Wire 45,55 Plumb 46 Plumb

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[Procedure amendment]

[Submission date] August 21, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction Details] A rear plate 28 is fixed to the rear upper surface of the guide support plate 22, and a mounting plate 29 is indirectly fixed to the rear plate 28, and a ring-shaped stripper (( A release plate 37 is attached to the stripper 37. The stripper 37 has an opening with an inner diameter through which the column gauge 35 can be inserted with a margin, and a detection pin 57 is attached to the lower surface of the support 26 . An upper sensor 58 and a lower sensor 59 are arranged below the extension of the detection pin so that the upper sensor 58 and the lower sensor 59 optically detect when the detection pin 57 is lowered and reaches the sensor position. It has become.

Claims (17)

[Claims] 1. A method of manufacturing a component, comprising: forming a component having a through hole or a concave hole; and inspecting whether or not a gauge member can be inserted into the through hole or the concave hole of the component to sort non-defective products. A method of manufacturing a component, wherein an attempt is made to insert the component into the through hole or the concave hole without applying a stress equal to or greater than a predetermined value between the component and the gauge member. 2. The method according to claim 1, wherein at least one of the component and the gauge member is retracted from the other before a stress greater than the predetermined value is applied between the component and the gauge member. A method for manufacturing a component, comprising performing an inspection. 3. The apparatus according to claim 2, further comprising a support for supporting one of the component and the gauge member in a direction toward the other, wherein the support is limited to less than the predetermined value toward the other. Wherein the one and the other are brought close to each other in a state where the applied stress is applied. 4. The method according to claim 3, wherein the stress is adjusted by a weight connected to the support. 5. The method according to claim 2, wherein when at least one of the component and the gauge member is evacuated from the other, it is determined that the gauge member cannot be inserted and an inspection is performed. . 6. The method for manufacturing a component according to claim 1, wherein the component is a laminated core for a motor having an inner hole. 7. An apparatus for inspecting the dimensions of a part based on whether or not a gauge member is engaged with the part, wherein a support for supporting one of the part and the gauge member toward the other is provided. A moving mechanism for configuring any one of the component and the gauge member supported on the body so as to be able to approach and separate from each other; and moving the support toward one of the other of the component and the gauge member. A holding unit configured to be movable on the opposite side to the direction and holding the support with a limited position holding force, wherein the component and the gauge member are engaged by the movement by the movement mechanism. A dimensional inspection apparatus for a component, wherein a stress greater than a predetermined value is not applied between the component and the gauge member. 8. The holding device according to claim 7, wherein
A guide mechanism that guides the support in a direction in which the component and the gauge member are separated from each other and a stress applying mechanism that applies stress toward one of the other of the component and the gauge member, A dimensional inspection device for a component, comprising: a restriction frame for restricting movement of the support toward the other of the component and the gauge member. 9. The traction member according to claim 8, wherein the traction member is connected to the support member and erected along a predetermined path, and is attached to a substantial tip of the traction member to hang down. A dimensional inspection device for a part, comprising: 10. A component dimensional inspection apparatus according to claim 7, further comprising detection means for detecting the movement of said support toward the other side of said component and said gauge member. . 11. The gauge according to claim 7, wherein when the bite occurs when the part and the gauge member are engaged with each other, the bite engages with either the part or the gauge member. A dimensional inspection apparatus for a component, wherein a stripper member for separating the component is disposed between the component and the gauge member which are separated from each other. 12. The driving mechanism according to claim 7, wherein the moving mechanism includes a driving source such as a linear motor, an air cylinder, a hydraulic cylinder, and a cam mechanism for driving the component and the gauge member to move toward and away from each other. A dimensional inspection device for parts, comprising: 13. The driving source according to claim 12, wherein:
A dimensional inspection device for parts, which is a linear motor. 14. The gauge member according to claim 7, wherein the gauge member has a tip introduction portion tapered toward the component,
An inspection surface formed behind the leading end introduction portion; 15. The component inspection apparatus according to claim 14, wherein the tip introduction section is provided with an inclined surface whose inclination angle gradually decreases from the tip toward the inspection surface. 16. The component inspection apparatus according to claim 15, wherein a plurality of inclined surfaces having mutually different inclination angles are connected to the distal end introduction portion. 17. An apparatus according to claim 15, wherein said tip introduction portion is formed in a shell shape.