JPH0810446Y2 - Rolling machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling machine for manufacturing splines, screws and the like.

[0002]

2. Description of the Related Art Rolling is a method in which a rolling tool is pressed against a work, which is a workpiece to be rolled, and the reverse shape of the surface of the rolling tool is transferred to the work for plastic deformation. Rolled splines, etc., have a continuous rolling structure as streamlines (fibers), and during rolling, the valleys are particularly stress-concentrated and work-hardened significantly, and the thread surface is smooth. It has become. For these reasons, rolled products are superior in mechanical strength and the like to cutting splines and the like, and a rolling machine has been exclusively used for processing spline shafts and the like.

By the way, the conventional rolling machine of this type has a structure mainly as shown in FIGS. The structure will be described. A pair of rolling tools 9 and 10 that move in opposite directions.
The work inserted between them is rolled to imprint the blade shapes of the rolling tools 9 and 10, but the work 15 is supported by the adjustment center 13 and the pressing center 14. The pushing center 14 is applied with a pushing force toward the adjustment center 13. On the other hand, the adjustment center 1
3 is provided with a sleeve 12, which is slidably supported by a sleeve case 11 fixed to the frame 1. Then, the adjustment nut 16 is attached to the end of the sleeve 12 as shown in FIG. Further, the adjusting screw shaft 17 is screwed into the adjusting nut 16, and the shaft head of the adjusting screw shaft 17 is supported by the bearing 18. The bearing 18 is fixed to the sleeve case 11, and the adjusting screw shaft 17 is mounted on the bearing 18.
The anti-rotation stay 19 attached to the shaft normally prevents rotation. Reference numeral 21 indicates a disk-shaped plate integrally fixed to the adjusting screw shaft 17, and reference numeral 22 indicates a holder for attaching the rotation stop stay 19 to the bearing 18.

The rolling machine having such a structure adopts the following method when adjusting the rolling length. First, the work 15 is placed between the adjustment center 13 and the pressing center 14.
To arrange. Then, the detent stay 19 is loosened and removed from the recess 211 of the plate 21. Then, the work 15
How much the tip of the inside of the rolling tool 9 (or the rolling tool 10) penetrates is measured. After that, the rolling length required to be rolled is compared with the above dimension, and the adjustment screw shaft 17 is rotated by the difference to move the sleeve 12 back and forth. The forward / backward movement of the sleeve 12 adjusts the tip position of the work 15 with respect to the rolling tool 9. Then, if there is an excess or deficiency in the measured dimension value, the above work is repeated many times. In this way, when the state in which the work 15 is arranged at the desired position is ensured with respect to the rolling tool 9, the plate 21 integrated with the adjusting screw shaft 17 is finally locked by the rotation stop stay 19. The rolling process starts after the above operations are completed.

[0005]

[Problems to be Solved by the Invention] However, the conventional rolling machine has the following problems. First, while the installation location of the rotation stop stay 19 and the adjusting screw shaft 17 for adjusting the rolling length is located on the rear surface of the rolling machine, the place where the insertion degree of the work 15 into the rolling tool 9 is actually measured. Was located in front of the rolling machine. As a result, the worker has to reciprocate repeatedly before and after the rolling machine, resulting in poor work efficiency. Further, since the locking stay 19 can be engaged with the adjusting screw shaft 17 only in the recesses 211, 211, ... Formed intermittently on the outer peripheral edge of the plate 21, high precision adjustment cannot be performed. It was

Further, in the case of a drive shaft of an automobile, there are cases in which the work 15 has the same shape on both sides and different processing is required only in the rolling length. In such a case, in the conventional rolling machine, even if the reversing device for the works 15 is provided, it is impossible to put them away one by one because the rolling length is different. Therefore, for all of the number of processings, there was no choice but to perform a two-step operation in which continuous processing is performed only on one side and then processing on the other side. As a result, productivity and yield are reduced.

The present invention solves the above-mentioned problems.
The C control not only promotes labor-saving production, but also improves processing accuracy. Furthermore, for workpieces with the same shape on both sides but different rolling lengths, rolling work is performed on both sides of the workpiece one by one The purpose is to provide a rolling machine that can be paid out as.

[0008]

The rolling machine of the present invention is a rolling machine for rolling a work inserted between a pair of rolling tools moving in opposite directions, and coining the blade shape of the rolling tool. There
A male screw having an adjusting center (13) and a pressing center (14) for rotatably sandwiching the work at its both ends, a female screw portion (40a) being connected to the adjusting center, and being screwed to the female screw portion. The position of the adjustment center is detected by a ball screw (40) that can move the adjustment center forward and backward by the rotation of the portion (40b), a servomotor (45) that rotationally drives the male screw part of the ball screw, and a detector. Then, by feeding back this and issuing a command of the movement amount to the servo motor, an NC device (50) for automatically controlling the position of the adjustment center is provided, and a set value related to a predetermined rolling length is input. The above N
Based on a command from the C device, the servo motor operates to cause the adjusting center to reach the set position via the ball screw, and the static torque of the servo motor is applied to the male screw portion via the work by the pressing force of the pressing center. Until the new setting position of the adjustment center is input and the servo is locked by the servo motor so that the signal of the detector does not change, and the adjustment center is rotated. It is characterized in that it is possible to perform the rolling of the work in which a predetermined rolling length is secured in a state where the workpiece is fixed.

[0009] Here, "the female screw portion is connected to the adjusting center" means not only the case where the female screw portion is directly connected to the adjusting center, but also the female member by interposing another member between the adjusting center and the female screw portion. This also includes the case where the screw portion is connected to the adjustment center. To "detect the position of the above adjustment center with a detector", use a ball screw (or servo motor shaft) as a scale, detect the rotation angle of the male screw of the ball screw, etc. In addition to the open loop method for determining the position of the adjustment center by converting it into the movement amount, the closed loop method for separately providing a linear scale for directly detecting the movement amount of the adjustment center is also included.

[0010]

According to the rolling machine of the present invention, when the target position at which the adjustment center is stopped is set and input to the NC device, the servomotor operates based on this command and the male screw portion of the ball screw is rotationally driven. The adjustment center moves back and forth. Then, the moving distance of the adjustment center is fed back and controlled so that the difference from the commanded value becomes zero, so that the rolling machine can be adjusted accurately in an unmanned state. Well
Were, for the rolling length only different work in the form of both sides are the same, the finish rolling end portion, a reversing device
Ri is an operation for inverting the workpiece is performed, during the reversing operation, performs feedback control to a new setting position of the adjusting center adjustment center to be a predetermined rolling length will be positioned set.

[0011]

EXAMPLES The present invention will be described in detail below based on examples. (1) Configuration of Rolling Machine FIGS. 1 and 2 show an embodiment of the rolling machine according to the present invention.
FIG. 1 is a sectional view of a rolling machine, and FIG. 2 is a block diagram showing a configuration of position control of an adjustment center. The same reference numerals as those in FIGS. 3 to 5 indicate the same or corresponding portions.

Reference numerals 1 and 2 are frames of the rolling machine, which are manufactured by casting. A pair of rectangular guide bars 5 and 6 are fixed to the frames 1 and 2. A pair of slidable sliders 3 and 4 are attached to fit the respective guide bars 5 and 6. Then, the rolling tools 9 and 10 are detachably attached to the sliders 3 and 4 via a rack holder (not shown). Reference numerals 7 and 8 denote pressing plates. Thus, the rolling tools 9 and 10 are imprinted by sandwiching the work 15 between the rolling tools 9 and 10 composed of a pair of racks and applying pressure to each other so that the rolling tools 9 and 10 can be coined. The method of moving the pair of rolling tools 9 and 10 in opposite directions is not particularly limited, and a rack-pinion method, a method of combining a ball screw and a servomotor, or the like can be adopted.

Reference numeral 13 indicates an adjustment center, and reference numeral 14 indicates a pressing center. A work 15 which is a workpiece inserted between the rolling tools 9 and 10 by the adjusting center 13 and the pressing center 14.
Hold both ends of rotatably. The pressing center 14 is constantly applied with a force to push it toward the adjustment center 13 side by air pressure or the like.

A sleeve 12 is attached to the base end of the adjustment center 13, and the sleeve 12 is fixed to an extension shaft 38. Reference numeral 11 is a cylindrical sleeve case fixed to the frame 1, and one end of the sleeve case slidably supports the sleeve 12. Further, the sleeve case 11 is fitted with an extension bearing 31 at the other end, and the extension bearing 31 also supports the extension shaft 38.

Reference numeral 32 indicates a rectangular fixed base fixed to the extension bearing 31. Four guide shafts 33, 33, ... Are erected on the fixed base 32 near the respective corners, and a fixing plate 37 is fixedly attached to their tip ends. On the other hand, guide bearings 34, 3 to the guide shafts 33, 33, ...
4 are slidably fitted and the moving plate 35 is attached to these guide bearings 34. Further, the female screw portion 40a of the ball screw 40 is fixed to the center of the moving plate 35. Reference numeral 36 is a cylindrical housing as shown in FIG. The housing 36 is integrated with the moving plate 35 to support the shaft head of the extension shaft 38.

Reference numeral 40b indicates a male screw portion of the ball screw 40. The male screw portion 40b is supported by the bearing 41 fixed to the fixed plate 37 and is screwed to the female screw portion 40a. A toothed pulley 42 as shown in FIG. 1 is attached to the end of the male screw portion 40b. On the other hand, a bracket 47 projects from the fixing plate 37, and the servo motor 45 is fixed to the bracket 47. Then, the toothed pulley 43 is attached to the shaft of the servo motor 45, and the toothed pulleys 42,
Ball screw 4
The rotation of the servo motor 45 can be accurately transmitted to zero. When the servomotor 45 is activated, the male screw portion 40b of the ball screw 40 is rotated to move the adjustment center 13 back and forth.

Since the ball screw 40 has a small rotational resistance, the pressing force of the pressing center 14 pushes the adjusting center 13 via the work 15 and the force is transmitted to the female screw portion 40a via the sleeve 12 and the extension shaft 38. , the female threaded portion 4
The torque that 0a tries to turn the male screw portion 40b acts. However, since the static torque of the servo motor 45 is made larger than this torque, it has a function of holding the position when the adjustment center 13 reaches the target value. Code 20
Indicates a coil spring. Used for limit switches (not shown).

Reference numeral 46 designates a detector attached to the servomotor 45. The electric signal detected by the detector 46 is fed back to the NC device 50 connected to the servomotor 45. Then, the electric signal subjected to the comparison processing inside the NC device 50 controls the servo motor 45 to dispose the adjustment center 13 at the target position.

FIG. 2 shows the NC control system of how the position adjustment of the adjustment center 13 is carried out. Here, an encoder using an optical scale is used as the detector 46. The detector 46 has the functions of a position detector 46a and a speed detector 46b, and sends a signal that detects the moving amount and moving speed of the adjustment center 13 to the position control unit and the speed control unit. The speed control is also performed after the rolling processing on one end side of the work 15 is completed and then the other end side of the work 15 is set by the reversing device (not shown) while the adjustment center 13 is set to the set position. This is for deployment. The position control unit and the speed control unit are connected to the input unit and the arithmetic control unit as shown in FIG. The reversing device is a general-purpose type
Workpiece 1 arranged between the center 13 and the pressing center 14.
Plays the role of inverting 5 .

(2) Operation and Action of Rolling Machine Next, the case of using the above rolling machine to adjust the rolling length will be described. First, the work 15 is mounted between the adjustment center 13 and the pressing center 14. Next, the setting position of the adjustment center 13 is input to the input section of the NC device 50. Then, the arithmetic control unit operates and the servo motor 45 operates via the speed control unit. The servo motor 45 rotationally drives the male screw portion 40b of the ball screw 40, and then, the ball screw 40
The adjustment center 13 connected to the female screw portion 40a moves toward the target value. What moves together with the adjustment center 13 is the female screw portion 40a, the moving plate 35, and the guide bearing 3.
4, housing 36, coil spring 20, extension shaft 38, and sleeve 12 (FIG. 2). On the other hand, the detector 46 detects the position and speed of the adjustment center 13 and feeds them back to the position controller and speed controller. If there is a difference between the detected value and the set value, the NC device 50 further issues a command to the servo motor 45 to work the adjustment center 13 closer to the set value.

Thus, the adjustment center 13 reaches the set position. By the way, after reaching the set position, the servo center is locked by the servo motor 45 so that the output signal of the detector 46 does not change until the new set position of the adjustment center 13 is input, and the adjustment center 13 is fixed. This is because it is not affected by disturbance. When rolling both sides of the work 15, the rolling length of the other end is also adjusted according to the above procedure. Then, the program is input to the input section of the NC device 50.

Next, an operation and an operation in the case of performing rolling processing on a work 15 having the same shape on both sides and different rolling lengths using the rolling machine will be described. As described above, the work 15 is attached to the adjustment center 13 arranged at the set position, and the pressing center 14 moves forward, so that the work 15 is rotatably clamped at both ends thereof. With this state secured, one end of the work 15 is rolled and completed. When the processing of one end of the work 15 is completed, the pressing center 14 retracts. Then, the reversing device is activated, and the work 1
Lift 5 upside down. During the reversal of the work 15, the adjustment center 13 is moved to a set position with a different rolling length based on the input command. Here, the speed control unit causes the adjustment center 13 to reach the set position before the work 15 is completely inverted. This is to eliminate lost time. When the work 15 is reversed and set, the pressing center 14
Moves forward. Thus, the work 15 is sandwiched between the adjustment center 13 and the pressing center 14, and the rolling process of the other end of the work 15 is completed. The processed work 15 is delivered. By repeating the above-mentioned operation, it becomes possible to continuously perform the rolling process on both ends of the work 15 in one step. The above series of operations is automated.

(3) Effects of the Embodiments According to the rolling machine having the above-described aspect, the worker can make the work 1
It became possible to align the rolling length while watching 5. In addition, it is no longer necessary to turn it to the back side of the rolling machine to adjust the rolling length. When both ends of the work 15 have the same shape and only different rolling lengths, the work 15 can be reversed and the machining can be continued as it is, so that it is possible to complete the process in one step, and the productivity and yield of the work 15 can be improved. Has improved. In particular, the effect was remarkable when the large number of works 15 were continuously processed. Furthermore, the conventional inconvenience that the rolling length adjustment is limited to the position of the concave portion 211 is also solved, and the rolling length setting can be adjusted to a fine dimension by the feed amount of the ball screw 40. Finished with high precision. In addition, since the rolling length can be controlled numerically, there are no adjustment problems or variations caused by the operator. Further, when the conventional type rolling machine is overhauled and used, a considerable part of the conventional parts can be used, so that the manufacturing cost can be kept low.

The present invention is not limited to the one shown in the above embodiment, but various modifications can be made within the scope of the present invention depending on the purpose and application. For example, the detector 46 is not limited to an encoder, and may be a speed detector 40b such as a tacho generator.
The role of the position detector 46a may be performed by the resolver or the like.

[0025]

As described above, the rolling machine according to the present invention is
Not only automation and unmanned progress, but also improved processing accuracy. Furthermore, for workpieces with the same side shape but different rolling lengths, rolling work is completed one by one, improving yield and improving productivity. It exhibits excellent effects such as contributing to the above.

[Brief description of drawings]

FIG. 1 is a sectional view of a rolling machine.

FIG. 2 is a block diagram showing a configuration of position control of an adjustment center.

FIG. 3 is an explanatory sectional view of a conventional technique.

FIG. 4 is a partially enlarged view of FIG.

FIG. 5 is a side view of FIG.

[Explanation of symbols]

 9 Rolling tool 10 Rolling tool 13 Adjustment center 14 Pressing center 15 Work 40 Ball screw 40a Female screw part 40b Male screw part 45 Servo motor 46 Detector 50 NC device

Claims (1)

[Scope of utility model registration request] 1. A rolling machine for rolling a work inserted between a pair of rolling tools moving in opposite directions, and imprinting a blade shape of the rolling tool, wherein the work is rotatable at both ends thereof. It has an adjusting center (13) and a pressing center (14) which are sandwiched by the female screw portion (40a) connected to the adjusting center, and the male screw portion (40b) screwed to the female screw portion is rotated to cause the above-mentioned A ball screw (40) that can move the adjustment center forward and backward,
A servomotor (45) for rotationally driving the male screw portion of the ball screw, and a detector to detect the position of the adjustment center,
NC instrumentation to a command movement amount by the feedback automatically controls the position of the adjustment center Shi out the servo motor
(50) and the above NC device in which a set value relating to a predetermined rolling length is input.
Based on the command of
If the above adjustment center is reached to the set position via the
Then, the static torque of the servo motor is pressed to press the center.
Trying to rotate the male screw part through the work by force
Torque of the adjustment center and a new adjustment center
Until the fixed position is input,
Servo lock is applied to prevent the above detector signal from changing.
Secures a predetermined rolling length with the adjustment center fixed
The feature is that the rolled work can be rolled.
Rolling machine.