JP3569095B2 - Press-fitting and serration processing method and apparatus used therefor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for performing serration processing on the outer periphery of, for example, a rod-shaped work after press-fitting a rod-shaped work into a sleeve-shaped work, and an apparatus used therefor.
[0002]
[Prior art]
A technique for performing such two types of work is disclosed, for example, in Japanese Utility Model Laid-Open No. 6-9724. In this technique, two or more operations are performed within one stroke of a processing block for a workpiece. That is, by moving the processing block, another work (can member for the air breather) is pressed into the outer periphery of one work (the packing for the air breather), and at the same time, a part of the work is caulked. A third work (ring material) is pressed into the packing.
[0003]
[Problems to be solved by the invention]
The work such as press-fitting or swaging can be performed simply by moving the working block in the pressing direction with respect to the work. However, when it is necessary to determine the phase around the axis of the work prior to the processing such as serration processing, it is difficult to apply the above-described conventional technology. Therefore, when press-fitting and serration processing are required for a work, the work must be performed by individual equipment, and the investment amount and space of the equipment increase.
[0004]
An object of the present invention is to perform press-fitting of one work to another work and serration processing required to determine a phase around the axis of these works in one stroke of a processing unit, thereby achieving equipment installation. The aim is to reduce the investment amount and space.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a method for press-fitting a rod-shaped workpiece into a sleeve-shaped workpiece and performing serration processing on the rod-shaped workpiece, wherein the two workpieces are set in a predetermined state. After the press-fitting is performed by the punch provided in the processing unit based on the lowering of the processing unit to the work in the first stage, the direction around the axis of the work with respect to the die provided in the processing unit After the punch is raised with respect to the processing unit, the serration is performed by the function of the die based on the lowering of the processing unit in the second stage.
[0006]
According to a second aspect of the present invention, there is provided an apparatus used in the press-fitting and serration processing method according to the first aspect, wherein a base on which the two works are set and a rotation about the axis thereof are given to these works. An indexing mechanism capable of determining a phase, a processing unit arranged to be able to move up and down with respect to the base, and a punch and a die provided to move up and down together with the processing unit are provided. The punch is configured to be able to move up relative to the processing unit.
[0007]
According to the first and second aspects of the present invention, it is possible to perform press-fitting of the workpieces within one stroke of the processing unit and serration processing that requires determining the phase of the workpiece in the direction around the axis. As a result, press-fitting and serration processing can be performed by one facility, and the investment amount of the facility and the installation space thereof can be reduced.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
1 and 2 are cross-sectional views showing an apparatus for press-fitting and serration. As shown in these drawings, the rotating body 13 is supported on the base 10 by a plurality of bearings 14 so as to be rotatable around the axes of a jig 16 and a mandrel 17 provided on the upper surface thereof. A driven gear 18 is fixed to the outer periphery of the rotating body 13, and a rotary encoder 19 is provided at a lower end of the rotating body 13.
[0009]
A rotating shaft 22 arranged in parallel with the rotating axis of the rotating body 13 is rotatably supported on the base 10 by bearings 24. The rotating shaft 22 is rotated by driving a motor 20 such as a stepping motor or a servo motor, which can control rotation and stop, and a gear 26 meshed with the driven gear 18 of the rotating body 13 is fixed to an upper end thereof. ing. Accordingly, the driving of the motor 20 causes the rotating body 13 to rotate around the axis thereof together with the jig 16 and the mandrel 17. These constitute an indexing mechanism 12 for determining the phase of the workpieces 50 and 52 described later in the direction around the axis.
[0010]
Above the base 10, a processing unit 30 which moves up and down by operation of a main cylinder (not shown) of the present apparatus is arranged. Explaining the configuration of the processing unit 30, the lifting base 32 is provided with a press-fitting punch 38 and a serration processing die 40 on the same axis as the mandrel 17. The punch 38 penetrates through the elevating base 32 and the axis of the die 40, respectively, and can be moved up and down relative to these. The punch 38 is constantly urged upward by the force of a spring 39.
[0011]
A knockout cylinder 34 is attached to the upper surface of the lifting base 32 through a support bracket 33 in a downward posture. A load cell 36 is provided at the end of the spindle 35 of the knockout cylinder 34, and the load cell 36 receives the upper end of the punch 38 urged by the spring 39 as described above. Therefore, the load applied to the punch 38 can be detected by the load cell 36.
[0012]
The lift base 32 is provided with a plurality of (for example, two) pins 42 penetrating the lift base 32 so as to be slidable in the up-down direction. A guide 44 is supported on the pins 42 below the die 40. The center hole of the guide 44 is located coaxially with the mandrel 17 (or the punch 38 and the die 40). The upper ends of the pins 42 serve as stoppers 43 for contacting the upper surface of the elevating base 32 when the processing unit 30 is raised and for raising the guide 44 together with the elevating base 32.
[0013]
Next, press-fitting and serration processing will be described.
First, a sleeve-shaped workpiece 50 is set on the mandrel 17 with the processing unit 30 raised (not shown). This work 50 is made up of two parts that have already been assembled together. On the other hand, the rod-shaped work 52 has an insertion portion 52a over a range of several millimeters from the lower end thereof, and the insertion portion 52a is inserted into the inner peripheral hole (hexagonal hole) of the work 50 from above to thereby insert the work 52 into the work 50. Is set. The workpieces 50 and 52 in the present embodiment are shaft components of a vehicle steering system, and the overall length, serration length, phase, and the like are slightly different depending on the vehicle type.
[0014]
Now, the operation of the main cylinder (not shown) based on the start signal of the equipment lowers the processing unit 30, and the lower end surface 38 a of the punch 38 touches the upper end surface of the rod-shaped work 52. In parallel with this, the guide 44 is positioned so as to support the work 52 from the outer peripheral side, whereby the work 52 and the die 40 are centered. The processing unit 30 continues to descend, and the operation of the main cylinder is performed based on a signal when the load detected by the load cell 36 (the load applied to the punch 38) reaches a preset “vehicle type determination load”. Stops.
[0015]
Accordingly, the processing unit 30 is also stopped, and the stop position is measured by a separately provided measuring machine (not shown), and the corresponding vehicle type of the workpieces 50 and 52 is determined. Then, the vehicle type based on this determination is collated with the vehicle type based on the production instruction information, and if the collation result is appropriate (OK), the main cylinder starts operating again based on the signal. As a result, the punch 38 pushes down the rod-shaped work 52 as shown on the left side of FIG. 1 and press-fits the work 52 into the sleeve-shaped work 50. The press-fitting load at this time is detected by the load cell 36, and the operation of the main cylinder is stopped based on a signal when the detected value reaches a value determined according to the vehicle type, and press-fitting is completed.
[0016]
When the value detected by the load cell 36 has reached the predetermined value, a signal indicating that the operation of the main cylinder is stopped based on the signal, and at the same time, the indexing mechanism 12 Is rotationally driven. Accordingly, as described above, the rotating body 13 rotates together with the jig 16 and the mandrel 17 to determine the phase around the axis of the workpieces 50 and 52 for serration processing. 19 is detected.
[0017]
Thereafter, as shown on the right side of FIG. 1 (or the left side of FIG. 2), the knockout cylinder 34 operates so as to retract the spindle 35, and accordingly, the punch 38 is raised by the force of the spring 39. Here, the main cylinder (not shown) of the apparatus is operated again, and the processing unit 30 is lowered as shown on the right side of FIG. As a result, the die 40 descends along the work 52, and serration processing is performed on the outer periphery of the work 52.
[0018]
As described above, in the present embodiment, the press-fitting and the serration processing that needs to determine the phase in the rotation direction can be performed by one stroke (downward operation) of the processing unit 30. After the serration processing is completed, the processing unit 30 is raised by operating the main cylinder in reverse. During the ascent, as described above, the upper surface of the elevating base 32 hits the stopper 43 of the pin 42, and thereafter the guide 44 moves up with the elevating base 32 through the pin 42.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a press-in step of an apparatus for press-in and serration processing.
FIG. 2 is a cross-sectional view illustrating a serration processing step of the same apparatus.
[Explanation of symbols]
10 Base 12 Indexing mechanism 30 Processing unit 38 Punch 40 Dice 50, 52 Work

Claims (2)

A method for press-fitting a rod-shaped workpiece into a sleeve-shaped workpiece, and performing serration processing on the rod-shaped workpiece, wherein both of the workpieces are set in a predetermined state, and a machining unit for these workpieces is provided. After the press-fitting is performed by the punch provided in the processing unit based on the lowering of the first stage, the phase around the axis of the work with respect to the die provided in the processing unit is determined, and the punch is formed. A press-fitting and serration processing method, wherein the serration is performed by a function of the die based on the lowering of the processing unit in the second stage after raising the processing unit with respect to the processing unit. 2. An apparatus used in the press-fitting and serration working method according to claim 1, wherein said work is set on a base, and said work can be rotated around its axis to determine a phase. A mechanism, a processing unit arranged to be able to move up and down with respect to the base, and a punch and a die provided to move up and down together with the processing unit. A press-fitting and serration processing device, which is configured to be operable.

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