JP3905766B2 - Both ends simultaneous crimping machine - Google Patents

Description

[0001]
[Technical field belonging to the invention]
The present invention relates to a both-end simultaneous crimping machine that simultaneously crimps the peripheral edge portions of both ends of an object to be crimped.
[0002]
[Prior art]
Conventionally, the basic structure and mechanism of such a double-end simultaneous crimping machine is already known in Japanese Patent Application Laid-Open No. 11-188435. However, a double-end simultaneous crimping machine having left and right ball screws as constituent elements has not been known.
[0003]
[Problems to be solved by the invention]
As a prior art, as shown in Japanese Patent Application Laid-Open No. 11-188435, a lower crimping punch is fixed by a double-end simultaneous crimping machine, and the upper crimping punch is lowered to simultaneously apply both ends of a shaft to be fastened. There was something to be tightened. However, since the lower caulking punch is fixed to such a simultaneous crimping machine at both ends, there is a problem that the shaft is lowered and the center is shifted by the lower caulking amount during caulking. Further, if the raising and lowering of the caulking punch is controlled using an actuator such as a hydraulic cylinder, it is difficult to finely adjust the caulking load and the caulking amount, and it cannot be said that the machining accuracy is excellent. Further, when a hydraulic cylinder or the like is used, the caulking machine is increased in size due to its mechanism, and a large installation space must be secured.
This invention is made | formed in view of this situation, and it aims at providing the both ends simultaneous crimping machine which solves the said subject and can perform a crimping process efficiently.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, as a result of intensive studies, the present inventors have determined that an upper pressure plate having a first caulking punch on one of the left and right ball screws having different screw directions on both sides of the ball screw, and a second caulking on the other side. The above-mentioned prior art is a both-end simultaneous crimping machine in which a lower pressure plate provided with a punch is screwed so as to be relatively movable in parallel with the direction of crimping of the object to be crimped, and both ends of the object to be crimped are simultaneously crimped. I found out that they could solve this problem.
[0005]
In addition, the present inventors have also found that the relative movement of the upper pressure plate and the lower pressure plate can be controlled by electric control using a servo motor, so that the caulking load and the caulking amount can be finely adjusted. . In addition, they also found that the size of the caulking machine itself can be reduced by using a servo motor to move the caulking machine.
[0006]
Furthermore, the present inventors have made various studies and completed the present invention.
Therefore, the present invention
(1) An upper pressure plate having a first caulking punch on one of the left and right ball screws having different screw directions on both sides of the ball screw, and a lower pressure plate having a second caulking punch on the other side A double-end simultaneous crimping machine that is screwed so as to be relatively movable in parallel with the crimping direction of the object to be crimped, and that both ends of the object to be crimped are simultaneously crimped.
(2) The both-ends simultaneous crimping machine according to (1), wherein the left and right ball screws have the same left-right pitch.
(3) The two-sided simultaneous crimping machine according to (1) or (2), wherein two right and left ball screws are provided per one crimping machine,
(4) The both-end simultaneous addition according to any one of (1) to (3), wherein operation control of relative movement of the upper pressure plate and the lower pressure plate is performed by electric control by a servo motor. It is characterized by automatically judging whether the peripheral edge portions of both ends of the clamping machine and the article to be clamped (5) are normally crimped based on the crimping load and the amount of crimping. The both ends simultaneous crimping machine according to any one of (1) to (4),
About.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples shown in the accompanying drawings.
1 to 3 show an embodiment of the present invention, and FIG. 1 is a partially enlarged view of a designated portion 50 shown in FIG. 3, in which both caulking punches are placed on both end surfaces of an object to be caulked before caulking. The state which the shaping | molding protrusion for crimping is contacting is shown. FIG. 2 is a front view of the both-end simultaneous crimping machine of the present invention. FIG. 3 is a left side view of FIG. 4 (a), 4 (b) and FIG. 5 shown in relation to this are different in detail from the embodiment apparatus shown in FIGS. 1 to 3, but are schematic diagrams for better explaining the embodiment. It is.
[0008]
First, in FIG. 1, a product to be crimped includes, for example, a rocker arm with a roller, which is incorporated in a valve operating device of an internal combustion engine (not shown) and drives the valve to open and close in conjunction with the rotation of a valve cam. It fulfills the function of The rocker arm body 10 is formed with a rocker shaft hole 11 through which a rocker shaft that supports the rocker arm body 10 so as to be swingable is communicated. The central portion 10a of the rocker arm body 10 is provided with a support portion for the roller 12 in contact with the valve cam, and the roller support portion includes a pair of support walls 10b facing each other with the roller 12 interposed therebetween. Is done. Each support wall 10b is provided with a support hole 10c that fits and supports both ends of a solid roller shaft 13 that is to be fastened.
[0009]
The roller shaft 13 constitutes the article to be fastened according to the present invention, and the roller 12 is fitted and supported via a needle 14 at an intermediate portion thereof. The peripheral parts of both outer surfaces of the roller shaft 13 are fastened and fastened to the peripheral part of the support hole 10c of the rocker arm body 10, and the caulking process is performed using a double-end simultaneous caulking machine A described below. Done.
[0010]
2 and 3 together, a first caulking punch P1 for caulking one end surface of the roller shaft 13 and a second caulking punch P2 for caulking the other end surface of the roller shaft 13 include: The both ends simultaneous caulking machine A is provided so as to be relatively movable on the same axis as the caulking direction of the roller shaft 13. The first caulking punch P1 is fitted and fixed to the upper base 22 fixed to the lower side of the upper fixing frame 21 provided on the upper pressure plate 20 of the both ends simultaneous caulking machine A, and the tip of the first caulking punch P1. On the front end surface of the portion 15, a caulking molding protrusion 15 a is integrally formed in the circumferential direction. On the other hand, the second caulking punch P2 is fitted and fixed to a lower base 25 fixed above the lower fixing frame 24 provided on the lower pressure plate 23 of the both ends simultaneous caulking machine A. On the front end surface of the tip portion 16, a caulking molding protrusion 16a is integrally formed in the circumferential direction. Both caulking punches P1, P2 are arranged on the same axis as the vertical caulking direction, and the upper pressure plate 20 and the lower pressure plate 23 are arranged on the same axis via left and right ball screws B having different screw directions on both sides. Screwed so as to be relatively movable.
Next, description will be made with reference to schematic diagrams that do not match in detail with the apparatus shown in FIGS. FIG. 5 shows the relationship among the left and right ball screws B, the upper pressure plate 20 and the lower pressure plate 23. In the left and right ball screws B, the rotation direction of the screws is reversed with a horizontal line indicating the center of the left and right as a boundary. Also, the two arrows indicate that the upper pressure plate 20 and the lower pressure plate 23 move in opposite directions during caulking.
[0011]
The left and right ball screws B are ball screws formed so that screw directions are different on both sides (left and right) of a known ball screw. In this embodiment, the right and left ball screws B The left and right ball screws B are provided for each of the both-end simultaneous crimping machines A.
[0012]
By rotating the left and right ball screws B by, for example, the servo motor C by the above mechanism, the screw directions are different on both sides of the left and right ball screws B. Therefore, when the upper pressure plate 20 is lowered, the lower pressure plate 23 is simultaneously moved. Further, by reversing the rotational direction of the left and right ball screws B, when the upper pressure plate 20 is raised, the lower pressure plate 23 is lowered at the same time.
Therefore, the first caulking punch P1 and the second caulking punch P2 are fitted and fixed on the pressure plate, respectively, so that they can be relatively moved on the same axis as the caulking direction of the roller shaft 13. That is, both ends of the roller shaft 13 are simultaneously crimped.
[0013]
Next, an example of a process for crimping the shaft end of the roller shaft 13 using the both-end simultaneous crimping machine A will be outlined.
The power output by the rotation of the servo motor C is transmitted to the pulley belt 31 via the output pulley 30 and input to the input pulley 32. The input power is adjusted to an appropriate rotational speed by the speed reducer 33, and the left and right ball screws respectively connected to the driven gear 36 via the drive gear 35 connected to the output shaft 34 provided in the speed reducer 33. Each B is rotated on the axis of the ball screw. In addition, when two or more of the left and right ball screws B are provided for each of the both ends simultaneous crimping machine A, for example, one servo motor may be provided for each of the left and right ball screws. In this embodiment, the power control is performed by one servo motor for each of the two simultaneous crimping machines because it is not preferable in terms of running cost and crimping accuracy.
[0014]
Accordingly, the upper pressure plate 20 and the lower pressure plate 23 screwed by the left and right ball screws B are parallel to the opposite directions along the screw direction of the left and right ball screws B by the left and right ball screws B rotating in the same direction. Relatively movable. That is, the first caulking punch P1 and the second caulking punch P2 provided in the upper pressure plate 20 and the lower pressure plate 23 are relatively moved up and down in the axial direction of the roller shaft 13, respectively. Both ends of 13 can be crimped simultaneously.
[0015]
In order to perform both-end simultaneous crimping by the both-end simultaneous crimping machine A, for example, the positioning device 40 provided in the both-end simultaneous crimping machine A is installed in advance so that the rocker arm body 10 is set in a predetermined position in advance. It is preferable that the insertion jig 41 provided is inserted into the rocker shaft hole 11 so that the rocker arm body 10 is fixed. In addition to this embodiment, a product to be crimped may be fixed using various known techniques.
[0016]
In this embodiment, the servo motor C is used so that satisfactory caulking can be performed, and electrical control thereby prevents unevenness of the caulking amount at the time of simultaneous caulking at both ends and the shaft of the object to be caulked. It is preventing. That is, the upper pressure plate 20 and the lower pressure plate 23 are simultaneously relatively moved at a high speed until the tips of the magnet scales 42 provided on the upper pressure plate 20 and the lower pressure plate 23 are brought into contact with each other. The caulking molding protrusions 15a and 16a of P2 come into contact with both shaft ends of the object to be caulked to become the roller shaft 13, and after an appropriate initial load is applied, the magnet scale 42 is set at a low speed. The caulking process is performed by moving forward by the specified caulking amount. After the caulking is completed, both the caulking punches are retracted at a high speed again by the caulking stroke.
Next, description will be made with reference to schematic diagrams that do not match in detail with the apparatus shown in FIGS. FIG. 4A shows a state immediately before the caulking molding protrusions 15a and 16a are in contact with both ends of the article to be caulked and the initial load is applied. Thereafter, a load is applied and caulking is performed. FIG. 4B shows a state immediately after the end of caulking.
[0017]
The caulking load is controlled by providing a guide 43 on the lower pressure plate 23, restricting the lower fixed frame 24 only in the relative movable direction, and setting the lower fixed frame 24 on the load cell 44. The output of the load cell 44 during caulking is controlled.
Furthermore, by providing a limit device 45 in the both ends simultaneous crimping machine A, in the unlikely event that the crimping load is overrun, the servo motor C is instantaneously stopped and the both ends simultaneous crimping machine A is mechanically damaged. Can also be prevented.
Subtle adjustment of the above caulking amount and caulking load is difficult with conventional actuators such as hydraulic cylinders, but it can be made easier and more reliable by electric control using a servo motor. The machining accuracy can be improved.
[0018]
As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the above-described embodiment, an apparatus and a method for caulking a roller shaft end surface of a rocker arm with a roller have been shown. However, a product to be caulked according to the present invention is not limited to such a rocker arm, Various machine parts that are fixed to the support by crimping may be used as the object to be crimped.
[0019]
【The invention's effect】
According to the present invention, the upper pressure plate having the first caulking punch on one of the left and right ball screws having different screw directions on both sides of the ball screw, and the lower pressure plate having the second caulking punch on the other side are the objects to be tightened. Both ends of the object to be tightened are screwed so that they can be moved relative to each other on the same axis as the direction of crimping. Can be processed well.
[Brief description of the drawings]
FIG. 1 is a partially enlarged view of a designated portion 50 in FIG. 3, showing a state in which crimping forming protrusions of both crimping punches are in contact with both end faces of an object to be crimped before crimping.
FIG. 2 is a front view of the both-end simultaneous crimping machine of the present invention.
FIG. 3 is a left side view of FIG. 2;
FIG. 4 (a) schematically shows a caulking machine caulking that shows a state immediately before the initial load is applied when the caulking molding protrusions 15a and 16a are in contact with both ends of the object to be caulked. It is a schematic sectional drawing of a part.
FIG. 4B is a schematic cross-sectional view of a caulking portion of the caulking machine schematically showing a state immediately after the caulking is finished.
FIG. 5 is a schematic cross-sectional view showing the relationship among the left and right ball screws B, the upper pressure plate 20 and the lower pressure plate 23;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Rocker arm main body 10a ... Central part 10b ... Support wall 10c ... Support hole 11 ... Rocker shaft hole 12 ... Roller 13 ... Roller shaft 14 ... Needle 15, 16, ... · Tip portions 15a, 16a ·············································································· Lower base 30 ... output pulley 31 ... pulley belt 32 ... input pulley 33 ... reduction gear 34 ... output shaft 35 ... drive gear 36 ... driven gear 40 ... · Positioning device 41 ··· Insertion jig 42 · · · Magnescale 43 · · · Guide 44 · · · Load cell 45 · · · Limit device A · · · Double-end simultaneous crimping machine B · · · Right and left ball screws C ... Servo motor P ... first crimping punch P2 ... second crimping punch O · · · · be caulked product

Claims (6)

The first caulking punch P1 for caulking one end surface of the roller shaft and the second caulking punch P2 for caulking the other end surface of the roller shaft are relatively on the same axis as the caulking direction of the roller shaft. The first crimping punch P1 is fixed to an upper base fixed to a lower portion of an upper fixed frame provided on an upper pressure plate of the both-end simultaneous crimping machine so as to be movable. On the front end surface of the front portion of the first caulking punch P1, a caulking molding protrusion is integrally formed in the circumferential direction, and the second caulking punch P2 is fixed to the lower part of the lower pressure plate of the both ends simultaneous caulking machine. A caulking molding protrusion is integrally formed in the circumferential direction on the front end surface of the front portion of the second caulking punch P2, which is adhering to a lower base portion adhering to the upper side of the frame. P2 is arranged on the same axis as the vertical caulking direction, and the upper pressure plate and the lower pressure plate are screwed on both sides. Direction via a different lateral ball screw, the are screwed to allow relative movable on the same axis, a both ends simultaneously crimping machine at both ends of the caulking material is caulked at the same time, the upper plate and lower plate Both-end simultaneous crimping machine is characterized in that the relative movable motion control is performed by electric control by a servo motor.   The both-end simultaneous crimping machine according to claim 1, wherein the left and right ball screws have the same left-right pitch.   The both-end simultaneous caulking machine according to claim 1 or 2, wherein two left and right ball screws are provided per caulking machine.   4. The method according to claim 1, wherein whether or not the peripheral edge portions of both ends of the object to be tightened are normally crimped is automatically determined based on a crimping load and a crimping amount at the time of crimping. The both ends simultaneous crimping machine of crab.   The both ends simultaneous crimping machine according to claim 4, wherein the crimping load is controlled by a load cell.   The both-end simultaneous crimping machine according to claim 4 or 5, wherein the crimping amount is controlled by a magnescale.

Images