DE2225009A1 - HOLDER FOR A REAR GROOVING TOOL FOR AUTOMATIC SCREW BARS OR THE LIKE - Google Patents

Description

Patent attorneys

Dr. Ing.H. Negendank

Dipl Ing.H. Hauck - DIcI Frys. VV. Schmitz

Dipl. Fng. E. Graalfs -! Tipi! - g. vy. Wehnert

8 Munich 2, f ^ art ^ aße 23

Telephone 5380586

Federal Screw Works

3H01 Martin Avenue May 20, 197 2

Detroit, Michigan 18210, USA File: M-2177

Holder for a kintering tool for automatic screw banks or the like . .

The invention relates to a holder for a back stabbing tool for automatic screw banks or the like.

Back grooving tools used in automatic screw banks have been known for some time. Such undercutting tools are used as required to produce Grooves, recesses or the like in bores or similar workpiece surfaces. An example of a undercut tool used for this purpose is described in US Pat. No. 2,495,291. While such prior back grooving tools were popular with purchases, they suffered from many defects, in particular ami lack of easy and precise adjustability,

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It was found that the ability to readjust exactly the position of the cutting tool on its carriage contributes greatly to the usefulness of the tool. In addition, the procedures for holding and retracting the tool slide were lacking in previous undercut tools the rigidity and operational safety.

It is an important object of the present invention to provide an undercut tool holder with a cutting tool support facing a mounting base can be precisely adjusted for moving the cutting tool carried by it back and forth.

A holder of the type described above, in which this is achieved, is characterized by a substructure with two spaced and inclined guides, by a carriage carried by the guides with a "in In the longitudinal direction thereby at a point between the guides extending bore, this bore at its, opposite Has countersunk bores defining annular shoulders at their inner ends and is marked by a rod holding a cutting tool which is arranged in the bore and protrudes from one end thereof, wherein the rod has a cutting tool receiving section at one end and next to its opposite

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lying ends two external thread sections, one in each other ' the appropriate key and keyway arrangement between this hole and the rod for preventing rotation of the rod in the bore, and wherein the rod further comprises two internally threaded has provided sleeves that are attached to the threaded sections of the Rod are screwed and outer cylindrical bearing surfaces have, which are tightly fitted in the countersunk bores, with the sleeves resting on the shoulders, whereby the Position the rod along the axis of the bore by changing the position of the sleeves on the threaded sections of the Rod can be readjusted «

It is a further object of the present invention to provide a holder for a back chipping tool that is compatible with Costs can be produced, has an insensitive structure, is operationally reliable, operates with a high degree of accuracy and can be used easily.

The tool holder is arranged on a machine slide. When the machine slide is moved towards the workpiece, a slide on the machine tool pulled up inclined ramps to engage a cutting tool with a Bring workpiece »The cutting tool can be readjusted in relation to the tool slide on which it is adjustable Pods is worn. These sleeves are screwed onto a fie for the cutting tool and in

ORIGINAL

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Countersunk holes in the ϊ / tool slide fitted.

Further features, details and advantages of the invention emerge from the following description of an exemplary embodiment based on the drawing. It shows:

1 shows an oblique view of an undercut tool holder according to the invention,

Fig '2 shows an enlarged section of the arrangement shown in Figure _e 1 along the line 2-2,

FIG. 3 shows a section of the arrangement shown in FIG along the line 3-3 °

The tool holder of the present invention has a heavy steel base 10 on which fine slides 12 are mounted is. The substructure can be attached to a slide (not shown) or the like. An automatic screw bank will. The manner of using the tool holder and its operation are similar to that of that in the above-mentioned US PS 2-495 291 shown tool, the tool slide 12 is with two of its opposite Sides protruding flanges 14- provided, which move in guides 16 formed on the lower part 10. the

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Flanges 14 are through, two cover plates 18 in the Guided tours 16 held. ·

The carriage 12 is pressed forward on the lower part 10 by two springs 20. These springs are attached with their rear ends to arms 22 attached to the slide. Their front ends are attached to posts 24 attached to the substructure 10. A bracket 26 is attached to the upper part of the carriage 12. This bracket has two arms 28 which are arranged at a distance from one another and which carry a transverse bolt 30 between them. An operating rod assembly 32 extends through the bolt 30 and has a spacer sleeve 34 and a nut at its front end and a clevis 38 at its rear end. be attached to a fixed part of the screw bank. When the machine carriage on which the substructure 10 is mounted is moved towards the workpiece, the actuating rod assembly 32 slides freely in the bolt 30. At a given point, however, the spacer sleeve 34 comes into engagement with the bolt 30 and pulls the carriage 12 against the bias of the Springs 20 on the guides 16 upwards. This serves for the forward movement of the cutting tool, not shown, which is brought into engagement with the workpiece surface to be machined by the tool holder. The direction of this cutting tool movement is radial to the axis of rotation of the workpiece.

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The construction of the carriage 12 and that supported thereby Parts is shown in greater detail in Pig. 2. It can be seen from this that the carriage 12 is provided with a bore 40 which extends from a front end face 42 of the carriage to its rear end face 44. The hole 40 is provided with an axial keyway 46. In the bore 40 a support rod for the cutting tool is arranged and carries a key 48 slidable in the keyway 46. The rod 50 is externally threaded at its front and rear ends 52 and 54 respectively. One between these Control section 56 of the externally threaded sections Rod has a smaller diameter than these threaded sections. A head portion 58 of the rod 50 extends from the bore 40 from forward and is with a receiving opening 60 provided for the cutting tool. The cutting tool is clamped in this receiving opening by means of clamping screws. These clamping screws are provided by means of the head part 58 Threaded holes 62 screwed.

Two adjustable identical plunger sleeves 64 are on the Threaded sections 52 and 54 screwed on. It is recognizable, that each sleeve 64 is provided with a key receiving portion 66 and an internal thread 68. Every Sleeve 64 also has a smooth cylindrical outer surface 70 which terminates in an annular end wall 72 at the inner end thereof. The band wall of one sleeve 64 can be attached to an inner shoulder

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74 in a countersunk hole 76 at the front end of the Hit hole 40. The end wall of the sleeve 64 can be against an inner shoulder 78 at the inner end one at the rear end the hole 40 countersunk hole 80 are screwed.

The relationship of key 48 to keyway 46 is such as to permit longitudinal movement of rod 50 in bore 40 while preventing rotation of that rod and 78 are pulled, the rod 50 can be readjusted in the bore 40 and fixed in any desired position along the axis thereof. Such a readjustment allows the axial readjustment of a cutting tool held in the recess 60 without changing the position of the substructure 10 on its machine slide. The cylindrical surfaces 70 are of course closely in the countersunk bores 76 and 80 einge- _r fits to hold the rod 50 exactly coaxial with the bore 40th

It should be emphasized that the guides 16 opposite the The longitudinal axis of the rod 50 of the cutting tool are inclined, with the rod shown horizontally. During the entire movement of the carriage 12 and its movement the Guides 1ü down retains the axis of the rod for that »The cutting tool changes its orientation, i.e. it remains horizontal if it was originally set in a horizontal position became. Through this device a in the

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Recess 60 held by the cutting tool. Machine slide moved into the recess or bore of a workpiece and then perpendicularly into engagement with the workpiece surface to be processed are advanced. The horizontal cutting tool movement is axial and the vertical Cutting tool movement is radial to the axis of rotation of the workpiece. The position in which the radial cutting tool movement begins and the radial depth of the cut are determined by the position of the substructure 10 on the machine slide and controlled by the position of the nut 36. Once the Substructure 1o set on the machine slide, the readjustments can be made in the axial position of the cut by readjusting of Sleeves. 64 are executed.

Patent claims

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Claims (6)

Federal Screw Works 2o. May 1972 File: M-2177 Claims 1. ^ Holder for a piercing tool for automatic Screw banks or the like., Marked by a substructure (10) with two spaced apart and inclined guides (16), by a carriage (12) carried by the guides (16) with one another. in the longitudinal direction thereby at a point between the guides (16) extending bore (40), this Bore on its opposite formations has countersunk bores (76, 80) which are annular at their inner ends Shoulders (74, 78) and is marked by a rod (50) holding a cutting tool, which is arranged in the bore (40) and protrudes from one end thereof, the rod (50) at one end has a cutting tool receiving portion (58) as well as two externally threaded sections (52, 54) next to their opposite ends, a and keyway arrangement (46, 48) between said bore (40) one and the rod (50) for preventing / rotating the rod (50) in the bore (40), and wherein the rod (50) has two sleeves (64) provided with internal threads (68), which on the threaded sections (52, 54) of the rod (50) and
are screwed / has outer cylindrical bearing surfaces (70), 309807/0777 which fitted tightly into the countersunk bores (76, 30) are, the sleeves (64) on the shoulders (74, 73) abut, whereby the position of the rod (50) along the axis of the bore (40) by changing the position of the Sleeve ji (64) on the threaded sections (52, 54) of the Rod (50) can be readjusted. 2. Holder according to claim 1, characterized in that that one end of the rod is the front end of the tool receives, and that the guides (16) are inclined upwards and backwards, 3. Holder according to claim 2, characterized in that that springs (20) between the substructure (10) and the carriage (12) extend and the carriage (12) after pretension at the front » 4 «Holder according to claim 1, characterized in that the sleeves (64) outside the countersunk holes (76, 80) have a key receiving portion (66). 5 «holder according to claim 1, characterized in that that two flanges (14) projecting from opposite sides of the carriage (12) are provided and in the currents (16) are stored, and that two retaining plates (18) the 309807/0777 Hold the flanges (14) in the guides (16). 6. Holder according to claim 1, characterized in that that the key and keyway arrangement is one of the rod (50) carried wedge (48) and a lead groove (46) extending in the longitudinal direction in the bore (40), 309807/0777 Blank page