JP4295873B2 - Work press-fitting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a workpiece press-fitting device for press-fitting a workpiece into a press-fit member.
[0002]
[Prior art]
Usually, various press-fitting devices are employed to press-fit a blind plug such as a steel ball into a hole of a press-fitted member such as a cylinder head. For example, an automatic press-fitting device disclosed in Japanese Utility Model Publication No. 56-176133 has a function of press-fitting a steel ball 3 into a hole 2 of a work 1 as a blind plug, as shown in FIG. A caulking member 5 is attached to a frame body 4 for supplying the steel balls 3 so as to freely advance and retract.
[0003]
An elevating member 6 is disposed on the frame body 4, and a pressing metal 7 and a pressure rod 8 are coaxially disposed on the elevating member 6. The elevating member 6 is connected to the pressure air source A at one end and the pressure switch B to the other end, and a pressure air passage 9 that can be opened and closed by the pressure rod 8 is formed.
[0004]
In such a configuration, in a state in which the steel ball 3 is disposed on the hole 2 of the workpiece 1 via the frame body 4, the lifting member 6 is lowered and is disposed on the lifting member 6 so as to freely advance and retract. The rod 8 presses the steel ball 3 into the hole 2 at its tip. When the elevating member 6 is further lowered, the pressing member 7 disposed on the elevating member 6 lowers the caulking member 5, so that the steel ball 3 is surrounded on the work 1 and caulking processing is performed. (See FIG. 6). At that time, since the pressure rod 8 blocks the pressure passage 9, the pressure switch B does not sense the pressure, and it is detected that the steel ball 3 is press-fitted with the specified press-fitting load.
[0005]
[Problems to be solved by the invention]
In the above prior art, after the steel ball 3 is press-fitted into the hole 2 by the pressure rod 8, the work 1 can be crimped by the crimping member 5, and the steel ball is connected via the pressure switch B. 3 can be automatically detected. However, there is a problem that it is impossible to detect whether the steel ball 3 is securely pressed into the hole 2 without causing pressure leakage. For this reason, the pressure leak between the steel ball 3 and the hole 2 must be inspected by a separate process and by an individual pressure leak inspection apparatus, which complicates the process and enlarges the entire equipment. Problems have been pointed out.
[0006]
The present invention solves this type of problem, and provides a workpiece press-fitting device that can perform a pressure leak inspection between a workpiece and a press-fitted member quickly and with high accuracy with a simple process and configuration. With the goal.
[0007]
[Means for Solving the Problems]
In the workpiece press-fitting device according to the present invention, a moving unit that is capable of advancing and retracting with respect to a press-fitting member having a hole portion having a diameter into which a workpiece made of a sphere having a predetermined diameter is press-fitted, and provided in the moving unit, In a workpiece press-fitting device having a press-fitting head for press-fitting a workpiece into the hole of the press-fitting member under advancing and retreating action,
The press-fitting head is provided coaxially with the hole in the moving portion, and has a large diameter portion larger in diameter than the hole,
Projecting from the center of the end surface of the large diameter portion, having a smaller diameter than the hole portion, and having a conical engagement surface that engages with the work on the inner surface of the tip facing the work, is inserted into the hole portion. A small-diameter portion that defines a space between the inner wall surfaces of the hole portion and engages the workpiece,
An air passage that extends along the axial direction from the large-diameter portion to the conical engagement surface of the small-diameter portion, and is supplied with pressure leak detection air;
Connected at a predetermined angle with respect to the air passage, and provided between the peripheral surface of the small diameter portion and the peripheral portion of the end surface of the large diameter portion, and the workpiece is inserted into the hole of the press-fitted member by the small diameter portion. A plurality of air outlet holes that lead out the pressure leak detection air from the air passage to the press-fitting part of the workpiece through the space after being press-fitted into the part;
Provided on an end face of the large diameter portion to surround the plurality of air outlet holes, a circumferential groove in which the inner peripheral surface is inclined toward the center inwardly,
Fitted to the circumferential groove, at least the inner diameter is larger than the hole and presses against the end surface of the press-fit member, and a predetermined gap is formed between the end surface of the press-fit member and the end surface of the large-diameter portion. A seal member protruding from the circumferential groove so as to form
With
Wherein the plurality of air outlet holes is characterized in that an opening between the seal member provided on an end surface of the large diameter portion and the peripheral surface of the small diameter portion.
[0008]
In the workpiece press-fitting device according to the present invention, the press-fitting head that can advance and retreat with respect to the press-fitting member having the hole through the moving part is formed to protrude from the center of the end face of the large-diameter part and has a smaller diameter than the hole. When the press-fitting head advances and retracts, the conical engagement surface of the small-diameter portion engages with a sphere as a work and press-fits the press-fitting member. In this state, air for pressure leak inspection is led out from the plurality of air outlet holes to the press-fitting site of the work through the air passage provided in the press-fitting head, and the pressure leak test of the press-fitting site is performed. As a result, the work press-fitting work and the pressure leakage inspection work, which have been conventionally performed in two processes, can be performed in one process via a single work press-fitting device, and workability is improved. Simplification and downsizing of the entire facility can be easily achieved. At that time, a sealing member is provided on the end surface of the large diameter portion so as to surround the air outlet hole portion, and the sealing performance of the press-fitting site can be effectively ensured. In addition, since the conical engagement surface is provided on the inner surface of the tip of the small diameter portion, the centripetal property of the sphere as the work is improved, and the sphere can be accurately press-fitted into the press-fit member.
[0010]
Furthermore, the end surface of the large-diameter portion is formed with a circumferential groove portion that surrounds the air outlet hole portion and the inner circumferential surface is inclined inward toward the center, and a sealing member that fits into the circumferential groove portion it is an O-ring. Accordingly, the press-fitting site of the workpiece can be reliably sealed with a simple configuration, and the pressure leak inspection of the press-fitting site is performed with high accuracy.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic perspective explanatory view of a workpiece press-fitting device 10 according to an embodiment of the present invention, and FIG. 2 is a partial sectional explanatory view of the workpiece press-fitting device 10.
[0012]
The workpiece press-fitting device 10 includes a base 12, and a positioning jig 15 for positioning and holding a member to be press-fitted, for example, the cylinder head 14 at a predetermined position is disposed on the base 12. The cylinder head 14 is provided with a plurality of holes 16, and a work as a blind plug, for example, a sphere 18 is press-fitted into the hole 16.
[0013]
A column 20 is erected on the base 12, and a hydraulic cylinder 24 is fixed to an arm portion 22 that extends in the horizontal direction from the top of the column 20. A moving part 28 is fixed to the tip of a rod 26 extending downward from the hydraulic cylinder 24, and a press-fitting head 30 is attached to the moving part 28.
[0014]
As shown in FIGS. 2 and 3, the press-fitting head 30 includes an attachment portion 32 attached to the moving portion 28, a main body portion 34 integrally provided on the lower side of the attachment portion 32, and the main body portion 34. A large-diameter portion 36 provided integrally with the lower portion, and a small-diameter portion 40 that protrudes from the center of the end surface 38 of the large-diameter portion 36 are provided. A tube connecting portion 42 is provided on a side portion of the main body portion 34, and an air passage 44 having one end communicating with the tube connecting portion 42 has a large diameter portion 36 and a small diameter portion from the center of the main body portion 34. The small diameter portion 40 is opened to the outside through the 40 axial centers.
[0015]
As shown in FIG. 4, a conical engagement surface 46 that engages the sphere 18 is formed on the inner surface of the distal end of the small diameter portion 40. A plurality of, for example, two air outlet holes 48 a and 48 b are formed corresponding to the boundary portion between the peripheral surface of the small diameter portion 40 and the end surface 38 of the large diameter portion 36. One end of each of the air outlet holes 48a and 48b communicates with the air passage 44, and is opened to the outside at a predetermined angle, for example, 45 ° with respect to the vertical direction.
[0016]
The air outlet holes 48a and 48b can be set in various positions depending on the shape of the press-fitted member and the workpiece. For example, the air outlet holes 48a and 48b can be opened only on the peripheral surface of the small-diameter portion 40, It is set at a position where only the end face 38 of the portion 36 is opened.
[0017]
On the end surface 38 of the large-diameter portion 36, a circumferential groove portion 50 is formed so as to surround the air outlet holes 48a and 48b, and an inner circumferential surface 52 constituting the circumferential groove portion 50 is inclined inward toward the center. is doing. An O-ring 54 that is a seal member is disposed in the circumferential groove 50.
[0018]
As shown in FIG. 2, one end of a tube body 56 is connected to a tube body connection portion 42 provided in the main body portion 34 of the press-fitting head 30, and an air supply source 58 is connected to the other end of the tube body 56. It is connected. In the middle of the pipe body 56, a pressure leak test is performed by measuring the pressure of the air supplied in the press-fitting head 30 and a space 64 (see FIG. 4) formed in the press-fitting site 62 between the sphere 18 and the hole 16. For example, a pressure detector 60 such as a back pressure gauge is connected.
[0019]
The operation of the workpiece press-fitting device 10 configured as described above will be described below.
[0020]
First, in the state where the cylinder head 14 is positioned and held by the positioning jig 15 provided on the base 12, a sphere 18 that is a blind plug is disposed on the hole 16 of the cylinder head 14. Next, the hydraulic cylinder 24 is driven, the press-fitting head 30 is lowered integrally with the moving part 28, and the sphere 18 is pressed by the small-diameter part 40 of the press-fitting head 30 and press-fitted into the hole 16 of the cylinder head 14.
[0021]
At that time, as shown in FIG. 4, the O-ring 54 arranged in the press-fitting head 30 is pressed against the end surface 14 a of the cylinder head 14, and a space 64 including the spherical body 18 and the press-fitting portion 62 of the hole 16 is formed. The In this state, when air is supplied from the air supply source 58 to the pipe body 56, the air passes through the air passage 44 of the press-fitting head 30 and is led out to the space 64 from the air outlet holes 48 a and 48 b ( (See arrow in FIG. 4).
[0022]
This space 64 is closed by the O-ring 54, and when pressure leakage occurs from the press-fitting site 62, the pressure drop is detected via the pressure detector 60 connected to the tube body 56, and A pressure leak is detected. Therefore, when the pressure detector 60 detects the prescribed pressure, it is detected that there is no pressure leak in the press-fitting site 62 between the sphere 18 and the hole 16.
[0023]
Thus, in the present embodiment, when the press-fitting head 30 is lowered under the action of the hydraulic cylinder 24 and the sphere 18 is press-fitted into the hole 16 of the cylinder head 14, the air supplied from the air supply source 58 is substantially the same as the air. The lead-out holes 48a and 48b lead out to the space 64 surrounding the press-fitting site 62, and an inspection is performed as to whether or not there is a pressure leak in the press-fitting site 62.
[0024]
For this reason, the press-fitting work of the sphere 18 and the pressure leakage inspection work of the press-fitting part 62 that have been conventionally performed in two processes using individual apparatuses are performed in one process via the single work press-fitting device 10. Can do. As a result, the entire operation can be performed efficiently and easily, and the facilities can be greatly reduced in size and simplified.
[0025]
Furthermore, in the present embodiment, a conical engagement surface 46 is formed on the small diameter portion 40 of the press-fitting head 30. Therefore, when the sphere 18 is pressed by the small diameter portion 40, the sphere 18 is easily and reliably centered by the engagement surface 46, and the centripetal property of the sphere 18 is improved, so that the sphere 18 is placed against the hole 16. It becomes possible to press-fit reliably. Thereby, the press-fitting failure of the sphere 18 is prevented as much as possible, and the efficiency of the press-fitting work of the sphere 18 is easily achieved.
[0026]
In this embodiment, the press-fitting head 30 has a circumferential groove 50 formed on the end surface 38 of the large-diameter portion 36, and an O-ring 54 is disposed in the circumferential groove 50 to improve the sealing performance. It is not limited to this, and various seal members can be used in place of the O-ring 54.
[0027]
【The invention's effect】
In the work press-fitting device according to the present invention, when a work is press-fitted into the press-fitted member by the press-fitting head, the pressure leak inspection air is led out from the press-fitting head toward the press-fitting part of the work, and the pressure leak test of this press-fitting part is performed. Is done. For this reason, the work press-fitting work and the pressure leak inspection work, which have been conventionally performed in two processes and in individual apparatuses, can be performed in a single apparatus and in one process, so that the entire work can be speeded up easily. As a result, simplification and miniaturization of the entire facility can be easily achieved.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a workpiece press-fitting device according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional explanatory view of the workpiece press-fitting device.
FIG. 3 is a perspective explanatory view of a press-fitting head constituting the work press-fitting device.
FIG. 4 is an enlarged explanatory view of a tip portion of the press-fitting head.
FIG. 5 is a partial cross-sectional explanatory view of an automatic press-fitting device according to a conventional technique.
FIG. 6 is an operation explanatory diagram of the automatic press-fitting device according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Work press-fit apparatus 14 ... Cylinder head 15 ... Positioning jig 16 ... Hole 18 ... Sphere 24 ... Hydraulic cylinder 30 ... Press-fit head 32 ... Mounting part 36 ... Large diameter part 40 ... Small diameter part 42 ... Tube connection part 44 ... Air passage 46 ... engagement surface 48a, 48b ... air outlet hole 50 ... circumferential groove 54 ... O-ring 56 ... pipe body 58 ... air supply source 60 ... pressure detector 62 ... press-fit portion 64 ... space

Claims (2)

A movable portion that is capable of advancing and retracting with respect to a press-fit member having a hole portion with a diameter into which a workpiece made of a sphere having a predetermined diameter is press-fitted, and provided in the moving portion, In a workpiece press-fitting device having a press-fitting head for press-fitting a workpiece into a hole,
The press-fitting head is provided coaxially with the hole in the moving portion, and has a large diameter portion larger in diameter than the hole,
Projecting from the center of the end surface of the large diameter portion, having a smaller diameter than the hole portion, and having a conical engagement surface that engages with the work on the inner surface of the tip facing the work, is inserted into the hole portion. A small-diameter portion that defines a space between the inner wall surfaces of the hole portion and engages the workpiece,
An air passage that extends along the axial direction from the large-diameter portion to the conical engagement surface of the small-diameter portion, and is supplied with pressure leak detection air;
Connected at a predetermined angle with respect to the air passage, and provided between the peripheral surface of the small diameter portion and the peripheral portion of the end surface of the large diameter portion, and the workpiece is inserted into the hole of the press-fitted member by the small diameter portion. A plurality of air outlet holes that lead out the pressure leak detection air from the air passage to the press-fitting part of the workpiece through the space after being press-fitted into the part;
Provided on an end face of the large diameter portion to surround the plurality of air outlet holes, a circumferential groove in which the inner peripheral surface is inclined toward the center inwardly,
Fitted to the circumferential groove, at least the inner diameter is larger than the hole and presses against the end surface of the press-fit member, and a predetermined gap is formed between the end surface of the press-fit member and the end surface of the large-diameter portion. A seal member protruding from the circumferential groove so as to form
With
Wherein the plurality of air outlet holes, the workpiece indentation device, characterized in that it is opened between the seal member provided on an end surface of the large diameter portion and the peripheral surface of the small diameter portion. The work press-fitting device according to claim 1 ,
Workpiece pressed and wherein the seal member to be fitted before Symbol circumferential groove is an O-ring.

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