JP5424438B2 - Method and apparatus for inspecting press-fit state of press-fit - Google Patents

Description

  The present invention press-fits a press-fitted object formed with a press-fitted portion over a predetermined length in the axial direction into a press-fitted object formed with a press-fitted portion formed in a predetermined length in the axial direction. The present invention relates to a method for inspecting the press-fitted state of a press-fitted object for determining whether or not a load has a predetermined load, and an apparatus therefor.

  Conventionally, a press-fitted object formed with a press-fitted portion extending in a predetermined length in the axial direction is press-fitted into a press-fitted object formed with a press-fitted portion in a predetermined length in the axial direction. In some cases, a press-fitted product with a press-fitted product is manufactured. Then, as a press-in state inspection method for determining whether or not the press-fit object is press-fitted in a predetermined state with respect to the press-fit object, an inspection of the press-fit state of the press-fit object that is determined by a press-fit load during press-fitting A method is known (see Patent Document 1).

In this inspection method, a press-fit object is placed on a pedestal formed on the upper surface of a press-fitting device so that the seat surface part of the press-fit object comes into contact, and the press-fit object is press-fitted into the press-fitted part of the press-fit object. Then, the press-fitting load is measured by a load measuring instrument such as a load cell attached to the press-fitting device. The electric signal of the press-fitting load is amplified by an amplifier, and the amplified analog signal is converted into a digital signal by an A / D converter and input to an arithmetic unit including a ROM, a RAM, and a CPU. When the maximum value A of the press-fitting load during press-fitting is determined to be within a predetermined standard value (Amin <A <Amax) set by the arithmetic unit, it is determined that the press-fitting is performed in a predetermined state. .
JP-A-5-249003

  Here, as shown in FIG. 1, for example, when the press-fitting object 1 is a housing and the press-fitting object 2 is an arm, the press-fitting reference surface of the housing is formed at one end in the axial direction of the press-fitting part 1a. The abutting surface 1b of the flange portion 1c is perpendicular to the press-fitted portion 1a and projects in the outer diameter direction. The press-fitting reference surface of the arm is an anti-seat surface portion 2c formed on the surface opposite to the arm seat surface portion 2a. Therefore, the anti-seat surface portion 2c serving as the press-fitting reference surface of the arm is formed by cutting in order to ensure accuracy.

  Here, when the arm is a casting, the press-fit object 102 may be deformed due to the influence of residual heat after being taken out of the mold, and as shown in FIG. 2, the press-fit object 102 in this deformed state is deformed. The press-fitted portion 102b may be formed by cutting. At this time, the press-fit location 102b of the press-fit object 102 is formed by cutting perpendicularly to the anti-seat surface portion 102c formed by cutting on the opposite side of the seat surface portion 102a, while being inclined with respect to the perpendicular of the seat surface portion 102a. To do.

  Then, when the press-fit object 1 is pressed into the press-fit object 102 in which the press-fit part 102b is inclined with respect to the normal of the seat surface portion 102a, the press-fit object 1 presses only a part of the press-fit part 102b. As shown in FIG. 3, the pressed part of the press-fitted portion 102b exceeds the yield point and undergoes large plastic deformation, and a preliminary gap 20 is generated on the opposite side of the plastically-fitted press-fitted part 102b. If the press-fitting is further continued, as shown in FIG. 4, a gap 30 is formed between the press-fitted part 1a of the press-fitted object 1 and the press-fitted part 102b of the press-fitted article 102 due to the influence of plastic deformation of a part of the press-fitted part 102b. Will occur. For this reason, the press-fit product in which the press-fit object 1 does not have a predetermined removal load with respect to the press-fit object 102 may be manufactured.

  Here, taking statistics of the relationship between the press-fit load and the slip-off load, the slip-out load generally has a relationship of about 1.2 to 1.5 times the maximum value A of the press-fit load. However, as shown in FIG. 7, the press-fitting load of the press-fitted product having the gap 30 rises until a part of the press-fitted portion 102b is plastically deformed, and the maximum value A2 of the press-fitting load during press-fitting is set in advance. Is within the predetermined standard value (Amin <A <Amax), but the removal load is only about 0.1 to 0.2 times the maximum value A of the press-fit load, and the predetermined removal load is I don't have it. For this reason, it is not possible to determine a press-fit product that does not have a predetermined pull-out load based on the maximum value A2 of the press-fit load during press-fitting, and there is a need for a method for determining a press-fit product that does not have a predetermined pull-out load. It was.

  The present invention has been made in view of the above circumstances, and an inspection method capable of easily making a determination when determining whether or not a press-fit object has been press-fitted into a press-fit object in a predetermined state, and An object is to provide such a device.

The method for inspecting the press-fitted state of the press-fitted material according to the present invention includes a press-fitted product in which a press-fitted portion is formed in a predetermined length in the axial direction and a press-fitted product in which a press-fitted portion is formed in a predetermined length in the axial direction In a method for inspecting a press-fitted object that is press-fitted into an object and determining whether or not the press-fitted object has a predetermined removal load, the press-fitted object comes into contact with the object to be pressed and the press-fitted object is pressed. The value of the difference between the maximum value of the press-fitting load and the minimum value while the press-fitted object is pressed into the press-fitted location is set in advance. The first determination is made as to whether or not it is within the range of the first standard value, and the determination result of the first determination determines whether the press-fit object has a predetermined unloading load with respect to the press-fit object. the stomach line, press-fit load, after taking the maximum value to rise after the start of the press, takes a minimum value decreases, the abutting Surface is the first feature to increase the contact to be press-fit thereof.

  The method for inspecting the press-fitted state of the press-fitted object according to the present invention is the second determination as to whether or not the maximum value of the press-fitting load while the press-fitted object is press-fitted into the press-fitted part is within a preset second standard value range. And determining whether the press-fit object has a predetermined removal load with respect to the press-fit object based on the determination results of both the first determination and the second determination. .

The press-fitting inspecting device of the press- fitted object of the present invention is a press-fitting in-flight inspection device for press-fitting a press-fitted object into a press-fitted object and determining whether or not the press-fitted object has a predetermined removal load. The press-fit object has an abutment surface that abuts the press-fit object and prevents the press-fit object from being pressed into the press-fit object beyond the press-fitting range, and measures the press-fit load of the press-fit object to the press-fit object. To determine whether the difference value obtained by subtracting the minimum value from the maximum value of the press-fitting load measured by the load measuring instrument is within the range of the preset first standard value. a first computing device, the possess to perform press-fitting load, after taking a maximum value rises after the start pressed, it takes a minimum value decreases, which abutment surface is raised and abuts against the pressed insertion thereof This is the first feature.

  According to the press-fitting state inspection device of the present invention, it is determined whether or not the maximum value of the press-fitting load during press-fitting measured by the load measuring instrument is within a preset second standard value range. The determination results of both the two arithmetic devices, the first arithmetic device and the second arithmetic device are input, and based on the determination results of both, whether or not the press-fit object has a predetermined removal load with respect to the press-fit object A second feature is to have a third arithmetic unit that performs the determination.

According to the method for inspecting the press-fitted state of a press-fitted product according to the first feature of the present invention, a press-fitted product formed with a press-fitted portion over a predetermined length in the axial direction is press-fitted over a predetermined length in the axial direction. In an inspection method in which a part is press-fitted into a molded press-fit object and it is determined whether or not the press-fit object has a predetermined removal load, the press-fit object comes into contact with the press-fit object and the press-fitted object is press-fitted. It has an abutting surface that prevents the object from being pressed into the object beyond the press-fitting range, and the value of the difference obtained by subtracting the minimum value from the maximum value of the press-fitting load while the press-fitted object is pressed into the press-fitted part is A first determination is made as to whether or not it is within the set first standard value range, and whether or not the press-fit object has been pressed into the press-fit object in a predetermined state according to the determination result of the first determination. In order to make a judgment, the difference between the maximum value of the press-fit load and the minimum value while the press-fit object is being pressed into the press-fitted location But it has rows first determination in whether the range of a preset first standard value, press-fitting load, after taking a maximum value rises after the start pressed, takes a minimum value decreases, Since the abutting surface rises when it comes into contact with the press-fit object, the press-fit object is the press-fit object with respect to the press-fitted product in which a gap is formed between the press-fitted part of the press-fitted object and the press-fitted part of the press-fitted object. On the other hand, it can be easily determined whether or not it has a predetermined load.

  According to the method for inspecting the press-fitted state of the press-fitted material according to the second feature of the present invention, is the maximum value of the press-fit load during the press-fitting of the press-fitted material into the press-fitted portion within the range of the second standard value set in advance? In order to make a second determination as to whether or not the press-fit object has a predetermined removal load with respect to the press-fit object based on the determination results of both the first determination and the second determination. The press-fitting object is predetermined with respect to the press-fitting object by the second determination as to whether or not the maximum value of the press-fitting load while the press-fitting object is being pressed into the press-fitted part is within the range of the second standard value set in advance. It can be determined whether or not it is press-fitted with a load of. Then, based on the determination results of both the first determination and the second determination, it is possible to easily determine whether or not the press-fit object has a predetermined removal load with respect to the press-fit object.

According to the press- fitting state inspection device of the press-fitting object of the first feature of the present invention, the press-fitting object is press-fitted into the press- fitted object and it is determined whether or not the press-fitting object has a predetermined removal load. In the press-fitting state inspection apparatus, the press-fit object has a butting surface that abuts the press-fit object and prevents the press-fit object from being pressed into the press-fit object beyond the press-fitting range. The range of the first standard value in which the value of the difference obtained by subtracting the minimum value from the maximum value of the press-fitting load during press-fitting measured by the load measuring instrument is measured. possess a first arithmetic unit for performing inner determine whether or not the press-fit load, after taking a maximum value rises after the start pressed, takes a minimum value decreases, the abutting surface is pressed insertion thereof to increase the contact, the press-fitting product is, it is determined whether or not having a predetermined extraction load to the press-fit product It is possible to realize a method of inspecting a pressed-in condition of the container easily.

  According to the press-fitting state inspection device of the second press-fitting object of the second feature of the present invention, the maximum value of the press-fitting load during press-fitting measured by the load measuring instrument is within a preset second standard value range. The determination results of both the second arithmetic device for determining whether or not, the first arithmetic device and the second arithmetic device are input, and based on the determination results of both, the press-fit object is a predetermined amount with respect to the press-fit object. And a third arithmetic unit that determines whether or not the load has a slip-off load, so that it is possible to simplify the method for inspecting the press-fitted state of the press-fit object whether or not the press-fit object has a predetermined slip-off load with respect to the press-fit object. Can be realized.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a press-fitting process of a press-fit object into the press-fit object when the press-fit part of the present invention is formed perpendicular to the seat surface part of the press-fit object, and the left half part is a state at the start of press-fitting, The right half is a partial sectional front view showing a state at the end of press-fitting. FIG. 2 is a partial cross-sectional front view showing a state at the start of press-fitting when the press-fitted portion of the present invention is formed to be inclined with respect to the perpendicular of the seating surface portion of the press-fitted object. FIG. 3 is a partial cross-sectional front view showing a state in the middle of press-fitting when the press-fitted portion of the present invention is formed to be inclined with respect to the normal to the seat surface portion of the press-fitted object. FIG. 4 is a partial cross-sectional front view showing a state at the end of press-fitting when the press-fitted portion of the present invention is formed to be inclined with respect to the perpendicular of the seating surface portion of the press-fitted object. FIG. 5 is an explanatory view of the principle of the press-fitting state inspection method of the present invention. FIG. 6 is a graph showing the relationship between the press-fitting time and the press-fitting load when the press-fitted location of the present invention is formed perpendicular to the seat surface portion of the press-fitted object. FIG. 7 is a graph showing the relationship between the press-fitting time and the press-fitting load when the press-fitted location of the present invention is formed so as to be inclined with respect to the normal of the seat surface portion of the press-fitted object.

  First, the press-fit object 1 and the press-fit object 2 will be described with reference to FIG. The housing constituting the press-fitted object 1 extends over a predetermined length in the axial direction, and the press-fitted portion 1a is formed in a circumferential shape. In addition, this housing has a flange in which a press-fit object 2 abuts on the outer periphery of one end in the axial direction, and an abutting surface 1b is formed to prevent the press-fit object 1 from being pressed into the press-fit object 2 beyond the press-fitting range. Part 1c. Inside the housing, a synthetic resin sheet 5, a plug 3 fixed between the housing and the sheet 5, and a ball stud 4 having a spherical ball head 4 a rotatably held by the sheet 5 are provided. The ball stud 4 has a handle portion 4b extending in the axial direction from the ball head portion 4a, and the handle portion 4b protrudes from a housing opening 1d formed at an end portion in the axial direction of the housing.

  The arm constituting the press-fit object 2 is a casting, and as shown in FIG. 1, a seat surface part 2a that comes into contact with a pedestal part 11 of a base 17 of a press-fitting device 10 described later is formed. The seat surface portion 2a has small irregularities peculiar to the casting surface. In addition, the arm pivotally supports a reference portion of an arm (not shown), and an anti-seat surface portion 2c opposite to the seat surface portion 2a and a press-fitted portion 2b perpendicular to the anti-surface surface portion 2c are provided over a predetermined length. Molded by cutting. At this time, the seating surface portion 2a having the casting surface is substantially parallel to the anti-sitting surface portion 2c. Here, since the seat surface portion 2a is substantially parallel to the opposite seat surface portion 2c, the press-fitted portion 2b is formed substantially perpendicular to the seat surface portion 2a. The inner diameter of the press-fitted portion 2b is formed smaller than the outer diameter of the press-fitted portion 1a of the housing.

Here, the arm that is a casting may be deformed due to the influence of residual heat after being taken out of the mold. This deformed arm, and pivotally supported at the reference portion of the arm (not shown), a seat surface portion 102a and the counter-seat surface portion 102c on the opposite side, with respect to anti seating face 10 2c is molded by cutting the pressed insertion portion 10 2b vertical. Then, as shown in FIG. 2, the press-fit portion 10 2b are thus molded inclined relative to the perpendicular of the seating face 10 2a.

  Next, the press-fitting device 10 for press-fitting the housing into the arm will be described with reference to FIG. The press-fitting device 10 has a base 17 below, and has a pedestal 11 on which the press-fit object 2 is placed on the top surface of the base 17. The pedestal portion 11 has an interior space 12 into which the handle 4b of the ball stud 4 and a part of the housing enter. The press-fitting device 10 is attached to the press-fitting head 13 that presses the housing that is the press-fitting object 1, the shaft part 14 that moves the press-fitting head 13 in the axial direction, and the shaft part 14. 2 has a load cell as a load measuring device 15 for measuring a load from a strain amount when it is press-fitted into the cylinder 2, and a cylinder 16 that holds the shaft portion 14 so as to be movable in the axial direction.

  Further, as shown in FIG. 5, the press-fitting device 10 is connected to an amplifier 16 for amplifying an electric signal from a load cell, an amplifier 16, a first A / D converter 17 for converting an analog signal into a digital signal, and an internal ROM , RAM and CPU, and the difference obtained by subtracting the minimum value C (value when the function changes from increase to decrease) from the maximum value B (value when the function changes from increase to decrease) The first arithmetic unit 18 determines whether or not the value D is within a preset first standard value range (Dmin <D). Furthermore, the press-fitting device 10 includes a second A / D converter 19 that is connected to the amplifier 16 and converts an analog signal into a digital signal, and has a ROM, a RAM, and a CPU therein. The second arithmetic unit 20 that determines whether A is within a preset second standard value range Amin <A <Amax, both the determination result of the first arithmetic unit 18 and the determination result of the second arithmetic unit 20 The third arithmetic unit 21 is provided for determining whether or not the housing has a predetermined removal load with respect to the arm.

  Next, a press-fitting process for press-fitting the housing into a press-fitted portion 2b penetrating the housing in a direction perpendicular to the arm seat surface 2a will be described with reference to FIG.

  As shown in the left half of FIG. 1, the arm on which the press-fitted portion 2 b is formed is placed by a conveying device (not shown) so that the seat surface portion 2 a comes into contact with the pedestal portion 11 of the press-fitting device 10. Next, the ball joint 6 to which the ball stud 4, the seat 5, the plug 3, and the housing are assembled is placed so that the housing opening 1d faces downward. At this time, the handle 4 b of the ball stud 4 is inserted into the in-table space 12 of the press-fitting device 10. Subsequently, the press-fitting head 13 of the press-fitting device 10 is lowered to press the flange portion 1c of the housing, and the press-fitting point 1a of the housing is gradually press-fitted into the press-fitted point 2b of the arm. Thereafter, as shown in the right half of FIG. 1, the abutting surface 1b of the housing abuts against the anti-seat surface portion 2c, the pressing by the press-fitting head 13 is continued for a predetermined time, and the pressing ends.

  At this time, the press-fitting load measured by the load cell increases rapidly because the front end of the press-fitting portion 1a of the housing is press-fitted into the press-fitted portion 2b of the arm as shown in a section a1 in FIG. After a part of the press-fitting portion 1a of the housing is press-fitted into the press-fitted portion 2b of the arm, the length in the axial direction of the press-fitting to the arm of the housing gradually increases, and as shown in the section b1, the section is more than the section a1. Increase in press-fit load is moderated. Thereafter, when a part of the press-fit portion 2b of the arm exceeds the yield point and is plastically deformed, the press-fit load is slightly lowered as shown in the section c1. When the abutting surface 1b of the housing comes into contact with the anti-seat surface portion 2c, press-fitting becomes impossible. Therefore, as shown in the section d1, when the press-fitting load suddenly increases and the press-fitting load exceeds a predetermined value, the section e1. As shown in FIG. 4, a constant press-fitting load continues. Here, the period during which the housing is press-fitted refers to the section a1 to the section c1. During the press-fitting, measurement can be performed by setting a predetermined time from the start of press-fitting.

  Next, a method for inspecting the press-fitted state of the press-fitted material will be described with reference to FIGS. When press-fitting is started by the press-fitting device 10, the press-fitting load is measured by the load cell 15 attached to the shaft portion 14. Next, the electric signal indicating the press-fit load obtained by the load cell 15 is amplified by the first amplifier 16, converted into a digital signal by the first A / D converter 17, and input to the first arithmetic unit 18. In the first arithmetic unit 18, a difference value D1 obtained by subtracting the minimum value C1 from the maximum value B1 of the press-fitting load during press-fitting is within a preset first standard value (Dmin <D). Is determined to be within the predetermined standard value, it is determined to be OK, and the information is input to the third arithmetic unit 18.

  The electric signal indicating the press-fit load obtained by the load cell is amplified by the first amplifier 16, converted into a digital signal by the second A / D converter 19, and input to the second arithmetic unit 20. In the second arithmetic unit 20, the second determination as to whether or not the maximum value A of the press-fit load during press-fitting is within the second standard value (Amin <A <Amax) is performed by the arithmetic function. Since it is within the second standard value, it is determined to be OK, and the information is input to the third arithmetic unit 18.

  In the third arithmetic unit 21, a third determination is made as to whether or not both the determination result from the first arithmetic unit 18 and the determination result from the second arithmetic unit 20 are OK by an internal arithmetic function, Since both are OK, it is determined that the press-fitted product is an OK product.

  Here, when the arm press-fitted portion 2b is formed perpendicular to the seat surface portion 2a and the housing is press-fitted in the vertical direction to the seat surface portion 2a, as shown in the right half of FIG. 1a and the press-fit location 2b are entirely pressed against each other, and no gap is formed between the press-fit location 1a and the press-fit location 2b. Further, the unloading load when the gap is not formed between the press-fitted point 1a and the press-fitted point 2b has a relationship that it is about 1.5 times the maximum value of the press-fitted load. That is, when the press-fit portion 2b is formed perpendicular to the seat surface portion 2a and the housing is press-fitted in the vertical direction with respect to the seat surface portion 2a, the press-fit portion 1a is formed with a gap due to plastic deformation. And the press-fitting load during press-fitting does not drop significantly. Therefore, it is determined whether or not the difference value D1 obtained by subtracting the minimum value C1 from the maximum value B1 of the press-fitting load during press-fitting is within a preset first standard value (Dmin <D). According to one determination, a gap is formed between the press-fitted portion 1a of the housing and the press-fitted portion 2b of the arm by press-fitting, and it can be determined whether or not the housing has a predetermined removal load on the arm. Further, when the arm press-fitted portion 2b is formed perpendicular to the seat surface portion 2a and the housing is press-fitted in the vertical direction to the seat surface portion 2a, the maximum value A1 of the press-fit load during press-fitting is set in advance. By the second determination for determining whether or not it is within the second standard value (Amin <A <Amax), it is possible to determine whether or not it is press-fitted with a predetermined load. Then, the third determination made based on the determination results of both the first determination and the second determination makes it easy to determine whether or not the housing has a predetermined removal load with respect to the arm. be able to.

  Next, a press-fitting process for press-fitting the housing into the press-fitted portion 102b penetrating the housing at an inclination with respect to the normal of the arm seat surface portion 102a will be described with reference to FIGS.

As shown in FIG. 2, as in FIG. 1, the arm surface (press-fit object 102) formed with the press-fit portion 102 b is brought into contact with the pedestal portion 11 of the press-fit device 10 by a transfer device (not shown). Place it in contact. Next, the ball joint 6 is placed so that the opening 1d of the housing faces downward. Then was then lowered to press-fit the head 13 of the press device 10, to press the flange portion 1c and around the housing, the press-fitting portion 1a of the housing is gradually pressed into the pressed insertion portion 10 2b of the arm. At this time, the press-fit location 102b is inclined with respect to the axial direction, and the housing moves in the axial direction. Therefore, a part of the press-fit location 1a of the housing strongly presses a part of the press-fit location 102b. Further, when the press-fitting is continued, as shown in FIG. 3, a part of the press-fitted portion 102b exceeds the yield point and is greatly plastically deformed. Finally, as shown in FIG. 4, the abutment surface 1b of the housing abuts against the counter-seat surface portion 10 2c, part of the press-fitting portion 1a is in contact with the press-fit portions 102b, and pressed portions 1a and plastic deformation A gap 30 is generated between the press-fitted locations 102b. Thereafter, pressing by the press-fitting head 13 is continued for a predetermined time, and the pressing ends.

  At this time, the press-fitting load measured by the load cell rapidly increases because the front end of the press-fitting portion 1a of the housing is press-fitted into the press-fitted portion 2b of the arm as shown in a section a2 in FIG. Then, even after a part of the press-fitting point 1a of the housing is press-fitted into the press-fitted part 2b of the arm, a part of the press-fitting part 1a of the housing strongly presses a part of the press-fitted part 102b. Thus, the increase of the press-fit load is more remarkable than the section b1 in FIG. After that, a part of the press-fitted portion 102b exceeds the yield point and undergoes a large plastic deformation, so that the press-fit load is rapidly lowered as shown in the section c2. When the abutting surface 1b of the housing comes into contact with the anti-seat surface portion 2c, press-fitting becomes impossible. As shown in the section d2, when the press-fitting load increases rapidly and the press-fitting load exceeds a predetermined value, the section e2 As shown in FIG. 4, a constant press-fitting load continues. Here, the time for press-fitting into the arm of the housing refers to the section a2 to the section c2. During the press-fitting, measurement can be performed by setting a predetermined time from the start of press-fitting.

  Next, a method for inspecting the press-fitted state of the press-fitted object in the case of an arm in which the press-fitted portion 2b is formed inclined with respect to the perpendicular of the seat surface portion 2a will be described with reference to FIGS. When press-fitting is started by the press-fitting device 10, the press-fitting load is measured by the load cell 15 attached to the shaft portion 14. Next, the electric signal indicating the press-fit load obtained by the load cell 15 is amplified by the first amplifier 16, converted into a digital signal by the first A / D converter 17, and input to the first arithmetic unit 18. In the first arithmetic unit 18, a difference value D2 obtained by subtracting the minimum value C2 from the maximum value B2 of the press-fit load during press-fitting is within a preset first standard value (Dmin <D). Therefore, it is determined as NG and the information is input to the third arithmetic unit 18. Here, the first standard value (Dmin <D) is press-fitted when the press-fit portion 2b of the arm is formed perpendicularly to the seat surface portion 2a and the housing is press-fitted in the vertical direction to the seat surface portion 2a. It is set to a value that does not include the difference value D1 obtained by subtracting the minimum value C1 from the maximum value B1 of the press-fitting load.

  The electric signal indicating the press-fit load obtained by the load cell is amplified by the first amplifier 16, converted into a digital signal by the second A / D converter 19, and input to the second arithmetic unit 20. In the second arithmetic unit 20, the second determination as to whether or not the maximum value A of the press-fit load during press-fitting is within the second standard value (Amin <A <Amax) is performed by the arithmetic function. Since it is within the second standard value, it is determined to be OK, and the information is input to the third arithmetic unit 18.

  In the third arithmetic unit 21, a third determination is made as to whether or not both the determination result from the first arithmetic unit 18 and the determination result from the second arithmetic unit 20 are OK by an internal arithmetic function, Since one side is NG, it is determined that the press-fitted product is an NG product.

Here, when the press-fit portion 102b is formed to be inclined with respect to the normal of the seat surface portion 102a and the housing is press-fitted in a direction perpendicular to the seat surface portion 2a, the housing strongly presses a part of the press-fit portion 102b. Therefore, the maximum value A2 of the press-fit load during press-fit is within the second standard value (Amin <A <Amax) set in the second determination. However, as shown in FIG. 4, since the gap 30 is generated between the press-fitted portion 1a and the plastic-fitted press-fitted portion 102b, the unloading load is about 1.2 to 1.5 with respect to the maximum value A2 of the press-fit load. The relationship of being doubled does not hold. That is, it has only a drop load that is significantly lower than the maximum value A2 of the press-fit load (about 0.1 to 0.2 times the drop load with respect to the maximum value A2 of the press-fit load). It is not possible to determine whether or not there is a slipping load. When the press-fit portion 102b is formed to be inclined with respect to the normal of the seat surface portion 102a and the housing is press-fitted in a direction perpendicular to the seat surface portion 2a, the press-fit portion 1a greatly plastically deforms the press-fit portion 102b, and the housing gap 30 is formed between the press-fit portion 1a and the arm of the press-fit portion 10 2b, press-fit load during press-fitted significantly lowered. Therefore, the first determination is made as to whether or not the difference value D2 obtained by subtracting the minimum value C2 from the maximum value B2 of the press-fit load during press-fitting is within a preset first standard value (Dmin <D). the determination, the press-fitting products gap 30 is formed between the press-fit portion 10 2b of the housing press-fit portion 1a and the arm of the press-fitting, housing, the determination of whether it has a predetermined extraction load to arm Can do. Then, the third determination made based on the determination results of both the first determination and the second determination makes it easy to determine whether or not the housing has a predetermined removal load with respect to the arm. be able to.

As described above, the housing in which the press-fit location 1a is formed over a predetermined length in the axial direction is press-fitted into the arm in which the press-fit locations 2b and 102b are formed over a predetermined length in the axial direction. In the inspection method for inspecting the press-fitted state with respect to the arm of the housing, the difference values D1, D2 obtained by subtracting the minimum values C1, C2 from the maximum values B1, B2 of the press-fit load while the housing is press-fitted into the press-fitted locations 2b, 102b. Is determined to be within the range of the preset first standard value (Dmin <D), and the housing is press-fitted into the arm in a predetermined state according to the determination result of the first determination. In order to determine whether the housing has been pressed or not, the difference values D1 and D2 obtained by subtracting the minimum values C1 and C2 from the maximum values B1 and B2 of the press-fitting load while the housing is press-fitted into the press-fit locations 2b and 102b are Set By the first determination in whether the range of the first standard value (Dmin <D), the press-fitting portion 1a and the arm of the press-fit portion 2b of the housing, the press-fitting products gap 30 is formed between the 102b, housing However, it can be determined whether or not the arm has a predetermined removal load.

  Further, a second determination is made as to whether or not the maximum values A1 and A2 of the press-fitting load during the press-fitting of the housing into the press-fitted locations 2b and 102b are within a preset second standard value (Amin <A <Amax). In order to determine whether or not the housing has a predetermined removal load with respect to the arms 2 and 102 based on the determination results of both the first determination and the second determination, The second determination as to whether or not the maximum values A1 and A2 of the press-fitting load during press-fitting into 2b and 102b are within a preset second standard value range (Amin <A <Amax). On the other hand, it can be determined whether or not it is press-fitted with a predetermined load. Then, based on the determination results of both the first determination and the second determination, it is possible to easily determine whether or not the housing has a predetermined removal load with respect to the arm.

  Further, a load measuring device 15 for measuring the press-fitting load to the arm of the housing, and a difference obtained by subtracting the minimum values C1 and C2 from the maximum values B1 and B2 of the press-fitting load measured by the load measuring device 15. And the first arithmetic unit 18 for determining whether or not the values D1 and D2 are within a preset first standard value (Dmin <D), the housing has a predetermined unloading load on the arm. It is possible to easily realize a method for inspecting the press-fitted state of the housing for determining whether or not it has.

  Then, it is determined whether or not the maximum values A1 and A2 of the press-fitting load during press-fitting measured by the load measuring instrument 15 are within a preset second standard value (Amin <A <Amax). The determination results of both the two arithmetic device 20, the first arithmetic device 18 and the second arithmetic device 20 are input, and whether or not the housing has a predetermined unloading load on the arm based on the determination results of both. Since it has the 3rd arithmetic unit 21 which performs determination, the inspection method of the press-fit state of the press-fit thing whether a housing has a predetermined detachment load with respect to an arm is simply realizable.

  In this embodiment, the housing and the arm have been described. However, the present invention can also be applied to a press-fitting object having other press-fitting locations and a press-fitting object having a press-fitting location.

When the press-fitted portion of the present invention is formed perpendicular to the seat surface portion of the press-fit object, the press-fitting process of the press-fit object to the press-fit object is shown, the left half is the state at the start of press-fitting, the right half FIG. 4 is a partial cross-sectional front view showing a state at the end of press-fitting. It is a fragmentary sectional front view showing the state at the time of a press injection start when the to-be-inserted location of this invention inclines with respect to the perpendicular of the seat surface part of a to-be-inserted object. It is a partial cross-sectional front view showing the state in the middle of press-fitting when the press-fitting location of the present invention is formed to be inclined with respect to the normal of the seat surface portion of the press-fitted object. It is a fragmentary sectional front view showing the state at the time of completion | finish of press-fit in case the press-fitting location of this invention is inclined and shape | molded with respect to the perpendicular of the seat surface part of a press-fit object. It is principle explanatory drawing of the press-fit state inspection method of the present invention. It is a graph showing the relationship between the press-fitting time and the press-fitting load when the press-fitted location of the present invention is formed perpendicular to the seat surface portion of the press-fitted object. It is a graph showing the relationship between the press-fitting time and the press-fitting load when the press-fitted location of the present invention is formed so as to be inclined with respect to the perpendicular of the seat surface portion of the press-fitted object.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press-in thing 1a Press-in place 2,102 Press-in object 2b, 102b Press-in place 15 Load measuring instrument 18 First arithmetic unit 20 Second arithmetic unit 21 Third arithmetic unit A1, A2 Maximum value of press-fit load during press-fitting B1, B2 Maximum value of press-fit load during press-fitting C1, C2 Minimum value of press-fit load during press-fitting D1, D2 Value of difference obtained by subtracting the minimum value from the maximum value of press-fit load during press-fitting

Claims (4)

A press-fit product (1) formed with a press-fit location (1a) over a predetermined length in the axial direction is a press-fit product (2b, 102b) with a press-fit location (2b, 102b) formed over a predetermined length in the axial direction ( 2, 102), and the press-fitted object inspection method for determining whether or not the press-fitted object (1) has a predetermined removal load,
The press-fit object (1) abuts on the press-fit object (2,102) and prevents the press-fit object (1) from being pressed into the press-fit object (2,102) beyond the press-fitting range. Having a butting surface (1b),
A difference value (D1, D2) obtained by subtracting the minimum value (C1, C2) from the maximum value (B1, B2) of the press-fitting load while the press-fitted object (1) is press-fitted into the press-fitted portion (2b, 102b). ) Is within the range of the first standard value set in advance,
The determination result of the first determination, the press-fitting thereof is (1) have a row is determined whether or not having a predetermined extraction load the relative pressed insertion product (2,102)
The press-fitting load rises after the press-fitting starts and takes the maximum values (B1, B2), then decreases to take the minima (C1, C2), and the abutting surface (1b) is the press-fitted object. A method for inspecting the press-fitted state of a press-fit object, wherein the press-fitted object rises when abutting on (2,102) . Whether or not the maximum value (A1, A2) of the press-fitting load while the press-fitted object (1) is press-fitted into the press-fitted part (2b, 102b) is within a preset second standard value range. Judgment
Based on the determination results of both the first determination and the second determination, it is determined whether the press-fit object (1) has a predetermined unloading load with respect to the press-fit object (2, 102). The method for inspecting a press-fit state of a press-fit object according to claim 1, wherein: In the inspection apparatus of the press-fitted state of the press-fitted object, the press-fitted object (1) is press-fitted into the press-fitted object (2,102), and it is determined whether or not the press-fitted object (1) has a predetermined removal load.
The press-fit object (1) abuts on the press-fit object (2,102) and prevents the press-fit object (1) from being pressed into the press-fit object (2,102) beyond the press-fitting range. Having a butting surface (1b),
A load measuring device (15) for measuring the press-fitting load of the press-fitted object (1) to the press-fitted object (2,102);
The difference values (D1, D2) obtained by subtracting the minimum values (C1, C2) from the maximum values (B1, B2) of the press-fit load during press-fitting measured by the load measuring device (15) are preset. a first processing unit (18) for judging whether range or not the first standard value, were perforated,
The press-fitting load rises after the press-fitting starts and takes the maximum values (B1, B2), then decreases to take the minima (C1, C2), and the abutting surface (1b) is the press-fitted object. An inspection device for a press-fitted state of a press-fitted object, which rises when abutting on (2,102) . A second arithmetic unit for determining whether or not the maximum value (A1, A2) of the press-fitting load during press-fitting measured by the load measuring device (15) is within a range of a preset second standard value ( 20)
The determination results of both the first arithmetic device (18) and the second arithmetic device (20) are input, and the press-fit object (1) is the press-fit object (2, 102) based on both determination results. And a third arithmetic unit (21) for determining whether or not a predetermined unloading load is present.

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