JPH033702A - Fixing tool for rotating lathe - Google Patents

Abstract

PURPOSE: To machine the branch end part of a T-shaped pipe attaching tool by providing clamping devices inserted into first and second opening end parts and a positioning device press-contacted with the outside of the branch end part for positioning the same with respect to the tool. CONSTITUTION: The respective end part clamping devices 34 and 36 of a device 26 have linear operation devices 38 and 40 for moving the clamping devices with respect to an article to be machined, and clamping faces 42 and 44 engaged with one end of the article 10 to be machined. The device 40 has a larger force than the device 38 and, when both are simultaneously actuated, the article 10 to be machined is completely clamped between the clamping faces 42 and 44, then the stronger device 40 starts to push the weaker device 38 in a rear direction, and the branch end part 22 of the article 10 to be machined is positioned by a locking device 36. Also, the device 26 includes a positioning device 70 for performing positioning to machine the horizontal part of the article 10 to be machined. A pin 78 for clamping a portion 22 is attached to the outer end part of a pivot arm 76.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fixture for rotating lathes, and more particularly to a fixture for holding T-shaped workpieces, such as pulp or pipe fittings.

Problems to be Solved by the Prior Art and the Invention There are two or more openings. Alternatively, there are difficulties in holding irregularly shaped workpieces, such as pulp or pipe fittings with misaligned openings. Heretofore, lathe fixtures for holding these types of workpieces have included devices such as adjustable cradle as in Dee-Roku U.S. Pat. No. 3,481,591. Alternatively, as shown in U.S. Pat. No. 4,218,051 to Stastini, such a fixture includes a cylindrical mounting member with an angled end surface and a cylindrical mounting member for attaching a workpiece to the end surface of the mounting member. It was equipped with a link chain device. One more
One example is shown in U.S. Pat. No. 4,667,548 to Astle et al., which is an end preparation tool for pipe fitting workpieces.

However, none of these devices
The problem of holding such single-shaped pipe fittings for processing branched ends has not been addressed. There is currently an unmet need in the market for such a retention fixture.

The present invention relates to an improvement of the above-mentioned device and to solving a problem which has not yet been solved.

SUMMARY OF THE INVENTION The present invention includes a rotating fixture for a lathe to enable machining of branched ends of single-shaped pipe fittings. The pipe fitting has first and second open main ends and at least one branched end.

The rotating fixture for a lathe of the present invention includes a clamping device inserted into both open ends and a positioning device abutting on the outside of one branch, and the longitudinal axis of the main portion of the pipe fitting at the branch end. The clamping device comprises first and second opposed frustoconical clamping surfaces, each of which has a mounting surface. dimensioned and positioned to engage the open end of the device; each of the first and second clamping surfaces being movable toward each other by first and second linear actuation devices, respectively; The clamping surfaces of the two linear actuators are slidably coupled to a common substrate.The first linear actuator has a stronger force than the second so that when the two linear actuators ramp the workpiece, the first A linear actuator provides forward movement and a second device provides reverse movement.A stop device is positioned over the flange of the workpiece to establish a precise approximate dimension from the flange to the branch outlet.

EXAMPLE Referring to FIG. 1, a workpiece 10 is shown which is a T-shaped pipe fitting. The present invention is intended to support this type of fixture 10. The pipe handle 10 may be made of any suitable material (6), but is typically cast metal, and has a main portion 12 having opposite ends 14, 16 connected by an axial bore 11. have Generally this type of pipe fitting 1
0, the ends 14.16 each have flanges 18.20
will have. Branching off from the main section 12 is a transverse section 22 terminating in a flange 24 .

FIG. 1A shows a workpiece 10A which is also a T-shaped but flangeless pipe fitting.2 The present invention is also contemplated for holding this type of fitting. Mounting tool 10
Similarly, the pipe fitting 10A also has a main portion 12A having both ends 14A and 16A connected by an axial hole 11A.
Has L.

Pipe fitting 10A does not have seven lunges as pipe fitting 10 does. The horizontal portion 22A is the main portion 1
It branches off from 2A and also has no flange. Because of the shape of these fixtures 10.10A, special problems arise for devices attempting to hold such workpieces while they are being processed, such as by grinding or cutting, particularly in their lateral portions 22°. (7) It becomes a time problem when trying to process 22A.

Referring to FIGS. 2-6, a device 26 according to the invention is designed to hold workpieces of this type.

According to a preferred embodiment of the invention, device 26 has a flat substrate 28 that can be of any suitable shape. As shown in FIG. 2, in this embodiment the shape is oval with flattened ends. As shown in FIG.
A hole 28a is formed in the center of the hole 28a. Control no pro 0
is mounted within hole 28a such that its knob does not rotate relative to base plate 28.

Referring primarily to FIG. 2, a support device 32 is mounted on the substrate 28 for supporting a pair of opposing spaced apart end clamp devices 64 and 66. In this embodiment, the support device 32 is formed by an offset plate 2a which is substantially flat and parallel to the substrate 28 and supported relative to the substrate by suitable struts 32b (also shown in Figure I5). There is. Each end clamping device 34,36 has a linear actuator (8) 38,40 for moving each clamping device relative to the workpiece 10. End clamping device 6466 further includes on each clamping surface 42,44 releasably engaging one end of workpiece 10. Each linear actuator 8,
40 are secured to a retainer plate 56 at one end and to respective clamping surfaces 42, 44 at the other end. Since the main part of the workpiece has a cylindrical and perforated end 14.16, the clamping surface 42.44 is truncated in shape and can be used for different cylindrical workpiece ends. It is sized to fit snugly into apertures of many different sizes, eliminating the need to replace the clamping surface with another sized clamping surface. 1. The length of the clamping surface 44 is considerably shorter than that of the clamping surface 44, and the clamping surface can be moved by an unnecessary amount.
A workpiece can be inserted between the clamping surfaces.

In this example, one of the linear actuating devices 40 is connected to the other device 6.
Workpiece 1 has more power than 8, and both should be activated at the same time.
After the 0 is completely clamped between the two clamping surfaces 42 and 44, the stronger linear actuator 40 begins to push the less forceful linear actuator 38 rearward. A stop device 6, such as a mounting band/positioning device, etc., attached to the inside of the offset plate 32a is provided in contact with the end 14. 68 to prevent rearward movement beyond a predetermined position. The stop device 360 dimensions are determined by the workpiece 100 dimensions and the desired final position of the workpiece 10 relative to the device 26. By using the above-described mechanism, repeatable positioning of the bifurcated end 22 of the caroe article 10 may be obtained.

In the most preferred embodiment, both linear actuators 68.4
The actuating device 40 is made up of multiple cylinders operated by the same power, such as hydraulic cylinders and air cylinders, and is more powerful.
are constructed with more cylinders than the other less powerful device 8, making one actuating device 40 stronger than the other. As shown in particular in FIGS. 4 and 6, the stronger linear actuator 40 consists of four cylinders 48, while the other linear actuator 68 has the same dimensions and the same blade (1
It consists of 0 cylinders, but only 6 cylinders5
0 is used.

To facilitate removal of the workpiece 10 from the device 26, both end clamping devices 34.36 are biased apart, i.e. several parts are forced apart from each other by separate f1 biasing means 52.54. be done. Each biasing means 52.54
has a retainer plate 56 removably coupled to the end of the offset plate 32a behind each clamping surface 42, 44 by bolts or the like. A shoulder bolt 58 is attached to the center of the CIJ retainer plate 56 by a nut 60, with its shoulder resting on the opposite side of the retainer plate from the nut, and most of the length of the shoulder bolt 58 being attached to the workpiece 10 side. The opposite end of the shoulder bolt 58 terminates in a bolt rad 62. An elongated bore 64 (FIGS. 2 and 4) is attached to the back of each clamping surface 42.44. This inner hole 64 is bored in the center, and the opening 6
4a is fitted into each bolt head 62. A spring device such as a coil spring, or a bolt head,
The shoulder bolt 58 is provided within the bore (U) 64 between the snap washer and the snap washer attached to the shoulder bolt 58 near its shoulder. The biasing means 52 and 54 thus tend to pull each clamping surface 42 and 44 away from the workpiece 10.

Of course, the blade of the coil spring 66 is the linear actuator 38.
40 and its actuating device 38
．． When the force 40 is released, the biasing means 52.54 is moved to the clamping surface 42.44? : must be selected to return to their respective retracted positions.

Apparatus 26 also properly positions workpiece 10. In particular, it is provided with a positioning device 70 for positioning its lateral parts for processing.

In this embodiment, the positioning device 70 includes an offset plate 32
a, a positioning support 72 attached to the substrate 28, or both. These positioning supports 7
2 is an offset plate 32a for each of the two pivot shafts 74.
each pivot axis is disposed on an opposite side of the workpiece 100 from the other pivot axis. Each pivot shaft 74 then supports (12) each pivot arm 76 such that each pivot arm rotates relative to offset plate 32a. As shown in FIG. 61, the pivot arms 76 are elongated and each pivot axis 74 is located approximately in the center of each pivot arm. Attached to the outer end of the pivot arm 76 is a ramp arrangement, such as a bin 78, for clamping the end of the lateral portion 22 of the workpiece, such as the lateral 7 flange 24.

The explanation will be made mainly with reference to Fig. 3, but the pivot arm Z
A replaceable wear plate 79 is attached to the opposite end of 6. A device 80 is provided to equally rotate the pivot arms 76 to center the lateral portions between the clamp bins 78.

This pivot generator 80 is located substantially within the hub 30. The pivot generator 80 has a linear actuator, such as a pair of hydraulic cylinders 82 , both fed from the same source 84 and positioned oppositely and outwardly of each cylinder 82 . The distal end is a wear plate 79
above each (13).

A fastening device 86 is provided to ensure that the pivoting of each pivot arm 76 relative to each other is equal. The device 86 has a pair of links 88, each of which is adjustable in length, to facilitate relative displacement of the crank bin 78 to position the workpiece in exactly the correct position.

This adjustment of the length of link 88 is possible by any suitable means. In this embodiment, these links consist of a threaded rod 90 with a nut 92 machined in its center and a tapped tube 94° 96 into which the rod 90 is screwed. It is equipped with ℃. These tubes 94,96 each terminate in a universal joint attached to the inner end of the pivot arm 76 and a fastener base plate 98 attached for free rotation to the hub 60. One revolution of each rod 990 and tube 94,96 using one of its nuts 92 changes the length of each link and positions one of the clamp bins 78 in various positions (14) without moving the other. It can be done.

As was the case with the clamping surfaces 42, 4.4, the clamping pins 7B are urged apart from each other by suitable means 10. In this embodiment, these biasing means include a bracket 102 replaced by the support 32b, a pin 104 that contacts the pivot arm 76, and a coil spring 106 that directs the pin toward the pivot arm and away from the bracket. It has

Since the biasing device 10 is placed closer to the substrate 28 than the pivot shaft 74, the pressing force of the biasing device is converted into a pressing force f to move away from the clamp pin 78.

This device 26 is of a type that rotates the workpiece while holding the machining tool stationary. A typical machining tool 108 is shown in FIG. The lathe spindle 112 is attached to the base plate 28 by any suitable means, such as (115) bolts 114. The base plate 28 and the remainder of the apparatus 26 are thus attached to the base plate 28 under zero force.
It is rotated relative to the tool 108.

While the above-described apparatus has been effectively adapted to meet the above objectives, the invention is not limited to that specific embodiment of a lathe turning fitting for a T-shaped pipe fitting as described above. . It is to be understood that all reasonable equivalents falling within the scope of the following claims are included in the invention.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a single-shaped pipe fitting held by the apparatus of the present invention, FIG. 1A is a perspective view of another type of T-shaped pine fitting, and FIG. 2 is a perspective view of an apparatus according to a preferred embodiment of the present invention. Fig. 3 is a sectional view taken along line 6-6 in Fig. 2;
4 is an end view taken along line 44 in FIG. 2, FIG. 5 is a top view taken along line 5-5 in FIG. 2, and FIG. 6 is an end view taken along line 6-6 in FIG. 10.10A...Pipe fitting, 12.12A・
...Main part, 14.14A, 16.16A...End part, (16) 18620...Flange, 22.22A...Branch part, 24...Flange, 28...Substrate, 6
0...Hub, 62...Support device, 34.36.
...clamp device, filters 8, 40...linear actuation device,
42.44... Clamp surface, 48.50... Cylinder, 52.54... Biasing means, 70... Positioning device, 76... Pivot arm, 78...
・Pin, 80... Pivot generator, 86...
- Fastener device. (17,)

Claims (1)

[Claims] 1. A lathe capable of machining a branch end of a T-shaped pipe fitting having a first open end, a second open end, and at least one branch end. The rotational fixture of the invention includes: a clamp device inserted into the first and second open ends; a positioning device pressed against the outside of the branch end for positioning the branch end with respect to a tool; A fixture comprising: 2. The fixture of claim 1, wherein the clamping device comprises opposing first and second frustoconical clamping surfaces, the clamping surfaces respectively extending from the first and second open ends of the fixture. a fixture sized and positioned to engage the fixture, each of the first and second clamping surfaces being movable toward the other by first and second linear actuation devices, respectively. 3. The fixture of claim 2, wherein both of the clamping surfaces are slidably connected to a common substrate, the first linear actuator having a greater force than the second linear actuator, and further comprising: a stop device positioned relative to the second clamping surface to stop movement of the workpiece at . 4. The fixture of claim 3, wherein each of the linear actuators comprises a hydraulic cylinder, and the first linear actuator includes more hydraulic cylinders than the second linear actuator. Ingredients. 5. The fixture of claim 3, wherein the first linear actuator is comprised of four hydraulic cylinders and the second linear actuator is comprised of three hydraulic cylinders. 6. The fixture of claim 1, further comprising a biasing device for biasing the clamping surface away. 7. The fixture of claim 3, wherein the positioning device comprises opposing positioning arms pivotally mounted to the common substrate, the arms being positioned to press against a branched end of the fixture. A fixture that terminates at a pressure contact. 8. The fixture of claim 7, wherein the positioning arms are coupled together for synchronous movement toward and away from each other. 9. The fixture of claim 7, wherein the positioning arms are synchronously actuated toward and away from each other by a positioning linear actuator. 10. The fixture of claim 9, wherein the positioning linear actuator includes two hydraulic cylinders, one connected to each of the positioning arms, both of the hydraulic cylinders being controlled by a single hydraulic control means. Fixtures. 11. The fixture of claim 10, further comprising a biasing device for biasing the positioning arm away. 12. The fixture according to claim 3, further comprising a support device for supporting the fixture in a predetermined position relative to the substrate.