JPS5993226A - Device for machining root of screw thread - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a device for machining thread roots, comprising a tool support for receiving a roller tool, the tool support being insertable into a tool receptacle of a lathe. The present invention relates to a tool holder which is mounted in a tool holder so as to be movably adjustable perpendicular to the working spindle axis of a lathe against the force of a pressure spring.

If particularly high demands are placed on the threads, as for example in the internal and external threads of pipes for oil pipelines, the roots of the threads are additionally processed with roller tools that smooth and strengthen the surface texture. . For this purpose, the roller tool must be pressed with a certain force against the root of the thread to be machined and guided along the thread groove.

For this reason, roller tools are mounted on lathes that receive workpieces. During the rotation of the workpiece, a roller tool arranged at an angle according to the thread lead is moved parallel to the workpiece by a tool carriage, so that the roller tool rolls along the thread groove. I can do it. The necessary pressing force is ensured in this case by a spring which presses the tool carrier, which receives the roller tool, against the workpiece. However, in known devices of this type, the crimping force for the roller tool is obtained only when the roller tool is applied to the workpiece, i.e. at the extent of the play load obtained at this time of the crimping spring. There are drawbacks. It is therefore necessarily impossible to define the desired clamping force exactly, which is especially true in the case of stiff clamping springs, which are preferred because of their short spring strokes.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve a device of the type mentioned at the outset in order to avoid the above-mentioned disadvantages and to provide a device in which the desired crimping force can be precisely set and maintained by simple technical means. It is to be.

In order to solve this problem, the present invention provides a configuration in which the tool carrier is mounted on the tool holder in a pivotable manner about an axis extending at right angles to the direction of action of the pressure spring.
A Brelow adjustment device is provided for the pressure spring that presses the tool carrier against the stop.

The provision of a preload adjustment device for the pressure spring makes it possible to press the tool carrier with a defined force against a stop defining the working position of the tool carrier, so that the rollers on the workpiece are In order to provide the clamping force of the tool, it is only necessary to apply the roller tool against the workpiece until the tool support lifts off its stop. The preload of the crimping spring adjusted via the preload adjustment device can thus be applied to the roller tool without having to obtain the preload of the crimping spring via the adjustment distance of the roller tool. The working position defined by the stop for the tool carrier changes only very slightly in this case. This is because only the supporting effect of the stop has to be subtracted. Despite the pivotable bearing type of the tool carrier, which preferably extends parallel to the working spindle axis of the lathe in order to be able to machine both external and internal threads, the roller tool therefore Misalignment that would impede the work process will no longer occur when the roller tool is applied.

When machining male and female threads, roller tools usually require opposing pressure forces. This is because both the external and internal threads are machined in the area facing the tool receptacle of the lathe. In order to ensure such a changeover for machining internal as well as external threads, an embodiment of the invention provides that the tool carrier has two bearing surfaces for the crimping spring, and that the prestress adjustment device has two bearing surfaces for the crimping spring. has a spring support adjustable in movement in the direction of action of the pressure spring, with two support surfaces each assigned to said bearing surface, for both pivoting directions of the tool support. One stop is provided. By providing two bearing surfaces for the compression spring and two support surfaces that can be moved relative to the bearing surfaces, it is possible in a simple manner to reverse the direction of action of the compression spring. . That is, when the spring support is moved to one side,
The support surface of the spring support, which is assigned to this direction of movement, presses the pressure spring against the bearing surface associated with it, and the tool support is pressed against one of the stops with a corresponding prestress. If the spring support is moved in the opposite direction, the other support surface and the other bearing surface act, so that the tool support is loaded in the opposite direction and presses against the other stop with an adjusted prestress. It will be done. By tensioning the pressure spring between in each case two of the four active surfaces, a desired reversal of the direction of action of the pressure spring is possible.

In this case, it does not matter whether the prestress adjustment device is connected to the tool carrier or to the tool holder. However, since the tool carrier may be replaced if necessary, it is advantageous to assign the preload adjustment device to the tool holder.

Both oppositely acting stops for the tool carrier can be used if it is desired to define a common working position for machining an external thread as well as an internal thread. shall be adjustable in movement between inactive and active positions. Because otherwise,
This is because the tool support cannot be lifted off either of the two stops, and the pressure spring does not act. In order to adjust the movement of the two stops, the construction is particularly simple if the two stops are arranged eccentrically on the actuating shaft in such a way that they are located diametrically opposite each other. With this configuration, by rotating the operating shaft by 180 degrees, one of the δ stoppers is brought to the working position each time, while the other stopper is moved from the working position to the non-working position each time. Forced to turn. Both movable and adjustable stops ensure a common working position for the roller tool machining internal as well as external threads, so that there is no need to change the tool carrier to hold the roller tool in position. Become.

In order to obtain a simple structural relationship, in another embodiment of the invention, the spring support is located at the end and forms the support surface.
It consists of a pin with two partial springs between two end discs, the pin being mounted in a tool holder in a movably adjustable manner by means of a screw, the spring holder having two bearing surfaces of the tool holder having two partial springs. It is rushing between the section springs.

With this configuration, when the spring support is moved in one direction, one partial spring is compressed between the contacting end disk and the spring receiver of the tool support. The other partial spring then relaxes. This is because the end disk of the other partial spring moves away from the spring support as a result of adjusting the displacement of the spring carrier.

This embodiment also ensures that the tool carrier is loaded in two opposite directions.

In order to adjust the desired pressing force of the roller tool on the workpiece, a preload adjustment device may be coupled with an indicator for indicating the preload. Due to the spatial arrangement of support surface and bearing surface with respect to one another, the adjustment distance of the spring support can be determined on the basis of the known spring properties as a value for the preload of the crimping spring and thus for the desired crimping force. Can be used as a value. In the above-mentioned arrangement, the display or the movement of the spring support may also consist of a distance indicator.

The invention will now be described in detail with reference to the drawings.

As shown in FIGS. 1 and d, the illustrated device consists essentially of a tool carrier 1 which receives a roller tool 2 and pivots about an axis 3. The tool holder 4 can be clamped into a tool receptacle of a flexible lathe as shown in the figure. In the guide groove 6 there is provided a casing 7 ζ forming part of the tool holder 4 and holding a shaft 3 for the pivotable support of the tool support 1; The center point of the pivoting guidance provided by the guide groove 6 for the casing 7 is located on the pivot axis of the roller tool 2 (in the range of the main plane perpendicular to the axis of the roller tool 2). Since the pivot axis for the roller tool 2 extends through the roller tool 2 (...), it is possible to move the casing 7 relative to the base plate 5 without moving the roller tool 2 out of the machining area as in the case of By pivoting, the inclination of the roller tool 2 can be adjusted depending on the lead of the thread to be machined.The angle of inclination of the roller tool 2 can be read on a measuring scale 8 arranged on the base plate 5. The selected inclination of the roller tool 2 can be fixed by means of a tightening screw 9.

The roller tool 2, which is aligned with the thread lead, must be pressed against the thread root with a corresponding pressure. Its crimping force is ensured by a crimping spring 10 which is connected to a preload adjustment device 11, in which case the crimping spring 10 is attached to one of two stops 12 which define the working position of the tool carrier 10. It is designed to press against body 1. When the roller tool 2 is crimped onto the workpiece, when the crimping position is achieved, the tool support 1 pivots against the force of the crimping spring 10 with the shaft 3 at right angles to the working spindle axis of the lathe. The stopper 12 is then lifted up. As a result, the adjusted 7° roll r of the pressure spring 10 acts on the roller tool 2.

The roller tool 2 can now roll along the thread groove to machine the root of the thread. That is, the workpiece is rotated via the working spindle of the lathe, and at the same time the roller tool 2 is moved parallel to the working spindle by means of the tool carriage according to the thread lead.

In order to be able to machine both internal and external threads, it must be possible to apply the necessary crimping force in the opposite direction (1°; for this purpose the crimping spring 10 is It is supported on a spring support 13 consisting of a pin 14 with two end disks 15 at its ends, between which a crimping spring 10 is arranged.
is inserted into the opening 16 of the tool carrier 1, which is designed in the area of the opening 16 and extends between the two partial springs 18 of the pressure spring 10. A spring support 117 is formed.Spring support 14
is connected to the tool support 1 inside the opening 16 via a guide pin 19 so as to be non-rotatable but movable in the axial direction. The spring support 1 is engaged with the adjusting screw 20, which is immovably supported in the casing 7 of the tool holder +4.
Depending on the direction of movement adjustment of 3, one of the partial springs 18 located between the spring receiver 17 and one of the end disks 15 is preloaded by a desired value at the same time as the other spring 18 is relaxed.
・I can do it. In this case, the preload force is applied to the partial spring 18 on the edged side, which moves the tool support 1 to one stop 1.
2 ((Press.

Since both stops 12 hold the tool support 1 equally in the working position and act in opposite directions, when the two stops 12 are used, the tool support 1 is firmly held by both stops 12 without being able to pivot. . In order to avoid this, one of the stones z (12
Only power; it must be used (・
. For this purpose, both stoppers 12 are eccentrically arranged on the operating shaft 21 so as to be diametrically opposed to each other, and as a result, when the operating shaft 21 is rotated 180°, they return to the non-operating position. One stopper 12 is pivoted into the active position and the other stopper 12, which is in the active position, is pivoted into the non-active position.

The pivot position of the stone 2120 is fixed by the locking ball 22 in this case. Therefore, whether the female thread or the male thread is machined can be adjusted via the operating shaft 21. After this adjustment has been made, the preload adjustment device 1
The adjusting screw 20 of 1 is turned in the direction of rotation corresponding to the rotational position of the actuating shaft 210 until the pressure spring 10 obtains the desired preload, that is, the preload required for the corresponding loading of the spring receiver 17 and thus of the tool carrier 1. It moves me. After applying the roller tool 2 to the workpiece, the root of the thread can be machined with the desired pressing force. This is because, after lifting the tool support 1 from the stop 12 in use by applying it, the prestress of the pressure spring 10 can be used as a pressure force for the pressure of the roller tool 2 on the workpiece. The lifting of the tool carrier 1 from the respective stop 12 can be indicated, for example via a microswitch, in order to signal the working position of the device.

In order to indicate the adjusted prelow P of the compression spring 10, the spring support 13 is coupled with an instrument 23 for indicating the travel adjustment distance of the spring support 13. For this purpose, the pin 14 of the spring support 13 is extended into a measuring stop 24, which has an angle lever.
25 is pressed by a spring 26.

The angle lever 25 is supported in the casing γ of the tool holder 4 so as to be pivotable about the shaft 2γ, and is connected to the contact 28 of the gauge 23 so that it can be rotated. A spring support 17 and an end disk 1, which can be considered fixed in position with respect to the casing γ, since the tool support 1 is supported in a limited manner by a stop in the casing 7.
Since the preload of the pressure spring 1o between the spring 1o and the spring 1o is ultimately related to the adjustment distance of the spring support 13 for a given spring characteristic, the deflection of the instrument 23 is determined by the value of the adjusted spring preload, 0 and the workpiece. This shows the value of the pressing force of the roller tool 2 against the pressure.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of an apparatus for processing the root of a screw thread according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 6 is a spring support. FIG. 3 is an enlarged cross-sectional view of a display device showing the adjustment distance of movement of the body. DESCRIPTION OF SYMBOLS 1... Tool support body, 2... Roller tool, 3... Axis, 4... Tool holder, 5... Board, 6... Guide groove, 7... Casing, 8...・Measurement scale, 9...
Tightening screw, 10...Crimp spring, 11...Preload adjustment device, 12...Stopper, 13...Spring support, 14...Ging, 15...End face disc, 16...・
Opening, 17... Spring holder, 18... Partial spring, 19.
... Guide pin, 20 ... Adjustment screw, 21 ... Operation shaft, 22 ... Locking ball, 23 ... Instrument, 24 ... Measurement stopper, 25 ... Angle lever 126. ...Spring, 27...Shaft, 28...Contactor

Claims (1)

[Claims] A device for machining the root of a thread, comprising a tool support (1) receiving a roller tool (2), which tool support is inserted into a tool receptacle of a lathe. In the version in which the tool carrier (1) is mounted in a possible tool holder (4) so as to be movable at right angles to the working spindle axis of the lathe against the force of a pressure spring (10), the tool carrier (1)
It is supported in a tool holder (4) so as to be pivotable about an axis (3) extending at right angles to the direction of action of the pressure spring (1o), and the tool support (1) is mounted on a stop (12). Device for machining thread roots, characterized in that a preload adjustment device (11) is provided for the pressing pressure spring (1o). 2. The tool support (1) has two bearing surfaces for the compression springs (1o), and a preload adjustment device (11) is assigned to each of said bearing surfaces for the compression springs (10). It has a spring support (13) movable in the direction of action of the pressure spring (10) with two support surfaces, one stop in each case for both pivoting directions of the tool support (1). (12) The apparatus according to claim 1, wherein: (12) is provided. 6. Device according to claim 2, characterized in that both stops (12) for the tool support (1) are movable and adjustable between an inactive position and an active position. 4. Device according to claim 6, characterized in that both stops (12) are arranged eccentrically on the actuating shaft (21) in such a way that they are located diametrically opposite to each other. 5. The spring support (13) consists of a pin (14) which receives two partial springs (18) between two end discs (15) located at the ends and forming a support surface. The pin is attached to the tool boulder (4) so that its movement can be adjusted with a screw.
), and the spring receiver (1T) of the tool support (1) having two bearing surfaces protrudes between the two part springs (18). The device according to any one of paragraphs. 6. Device according to any one of claims 1 to 5, characterized in that the preload adjustment device (11) is combined with an indicator for indicating the preload. 7. Device according to claim 6, comprising an indicator (23) indicating the travel adjustment distance of the indicator or spring support (13).