JPS6133805A - Tool holder - 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 present invention relates to a tool, in particular a connecting part having a connecting shaft or similar part at one end, a mounting bore coaxial with the axis of the connecting shaft at the other end, and a tool receptacle at one end. have,
a tool receiver having a cylindrical shank mounted at the other end for axial movement in the mounting bore and having a fine thread in the forward area adjacent to the tool receptacle; A shaft having a groove/protrusion connecting member between the parts, and at least one set screw that acts on an inclined surface extending obliquely with respect to the axis of the shaft part and is screwed into a threaded hole extending in the radial direction of the connecting part. The present invention relates to a holder for a rotary tool having a direction l1 joint device.

Known tool holders of this kind are called "setting sleeve resezo tackle" and are DIN 6327 or 5
5058. After loosening the set screw,
The tool receiver is moved axially relative to the connecting part by rotating the adjusting nut.

In this way, the axial adjustment of the tool receiver is only movable in one direction, ie away from the coupling part. If the tool receiver is adjusted in the opposite direction, i.e. towards the connecting part, if it is rounded, the cylindrical shank will move further into the mating hole during this time, and this operation will be carried out by the tool located in the tool receiver or in the tool carrier. This can only be done by pushing the free end of the However, this operation is not trivial and can result in inaccurate tool setting. Since the fine thread between the adjusting nut and the detail is not loaded during adjustment, the rotating part of the thread is sometimes attached to one side of the trapezoidal thread,
And sometimes it will abut the other side. If an axial force is applied to the tool during machining, the tool receiver will move by the amount of play in the screw, since the set screw is inadequate for transmitting such a large axial force. Due to the movement of the tool receiver, the tool, which has been previously set at a certain axial position, changes its position, thereby impairing the machining accuracy. Tool holders of the type described above are used in practice to align the tool with respect to the machine tool and with respect to the line of travel or the machining center, for example in a multi-axis drill head, for example when replacing a dull tool with a new one. Things often happen that have to be done. Furthermore, the known tool holder has the disadvantage that if the adjusting nut grips the fine thread, it easily loosens due to lack of or inadequate locking action, whereby this nut loses its axial supporting action and the tool It has the disadvantage that it can be moved unintentionally over a fairly large distance.

The problem underlying the invention is to provide a tool holder of the type mentioned at the beginning of this specification for tools with axial adjustment, in particular for rotary tools, which tool holder has the following dimensions: Coupled with the small size, a precise and sensitive adjustment of the tool receiver can be carried out, and at this tool cost it does not change its position under any working conditions, thus exhibiting high machining accuracy.

According to the present invention, the above problem is achieved by providing a tool holder having the configuration described below, in which the cylindrical shaft has a coaxial through-bore at its free end and a coaxial through-hole in the inner hole. a large-diameter longitudinal bore following the mating bore, a headed screw is disposed within the longitudinal bore, the shank of this screw passes through the through bore, and the screw is threaded at the rear end of the mating bore. A compression spring is threaded into the bore and loads a cylindrical shank extending toward the rear end of the mating bore, the screw head and an annular shoulder provided between the through bore and the longitudinal bore. will be placed between the

Therefore, this invention is arranged between the receiving part and the tool cost,
Thereby, the adjusting nut is pressed into contact with the front side of the connecting part in each machining state, so that when the tooling is adjusted, the adjusting nut and the fine thread of the shaft are always fixed or tightened together in the same direction. It begins with the idea that First of all
Tool costs and therefore tool adjustments become easier to implement. When the adjusting nut is rotated in one direction, the tool part moves away from the coupling part under the action of the adjusting nut against the force of the spring.

When the adjusting nut is rotated in the other direction, the spring automatically draws the tool into the connection. In both cases, the pruning nut maintains the front side of the connecting part and the side of the fine thread of the adjusting nut in pressure contact, and the shank also remains in abutment in the direction in which they abut against each other due to the action of machining forces. keep it. Because of this property of the adjusting nut relative to the thread itself and the connection part, the tool and the tooling cannot change their position even when large axial forces are applied.

Since the adjusting nut is always pressed against the front side and additional frictional forces are exerted by the fixing or tightening of the fine threads, the adjusting nut does not loosen even under the influence of vibrations that may occur during machining. is maintained, so that the correct alignment of the tool is maintained in all cases. Due to the precise setting and maintenance of this setting under all machining conditions, the new tool holder enables high machining accuracy. Moreover, this tool holder is compact as a whole, and its axial dimensions in particular are small, so it is stable and the machining accuracy is therefore increased.

The invention will be described in detail below with reference to embodiments shown in the drawings.

The tool holder 1 according to the invention shown in FIG. 1 consists of two main parts: a connecting part 2 and a tool holder 3 movably mounted in the connecting part. The connecting portion 2 has a connecting shaft portion 4 having an arbitrary shape at one end. The connecting shaft 4 is used to connect the tool holder 1 to a machine tool spindle 5 or to another tool holder. German Patent No. 310843
A coupling device according to No. 9 is used to connect the shaft 4 to the machine tool spindle 5. The device has a locking fender 7 slidably mounted in a transverse bore 6 in the shaft 4, the locking pin having a conical recess at one end and a conical shoulder at the other end.

These parts of the fixing pin 7 cooperate with two clamping screws 8 which reliably clamp the tool holder 1 to the machine tool spindle.

The connecting part 2 further has a mounting bore 9 at its other end, which is recessed at the free end of the connecting part 2 by an annular front face 10.The cylindrical shaft 11 of the tooling part 3 is It is movably mounted in the mating bore 9 with a slight play that at most allows for axial adjustment.The tool holder 3 has a tool receiving portion 12 at its end remote from the shank 11, the shape of which is In the embodiment according to FIG. 1, the tool receiving part 12 according to German %IF No. 31 08439 is designed similarly to the receiving part of the machine tool spindle 6, so that no further details will be given on this. The explanation of this will be omitted.The shaft portion 11 is provided with a fine threaded portion 13 in the area adjacent to the tool receiving portion 12, and an adjusting nut 14 is screwed into this threaded portion. For this purpose, a plurality of radial bores 15 are formed into which corresponding keys are inserted.The adjusting nut 14 rests against the front face 10 by its annular surface 14a.

The shank 11 further has a longitudinal bore 16 and at its inner free end a through bore 17, the diameter of which is smaller than that of the longitudinal bore 16. An annular shoulder 18 is thus formed between the longitudinal bore 16 and the through bore 17. A coaxial screw 19 is disposed in the vertical inner hole 16, and its shaft portion 19m passes through the through-hole 17 and is screwed into the screw hole 2, 0 formed in the rear end 9a of the fitting inner hole 9. will be combined. A pressure spring 2'), preferably of the form of a plurality of disc springs, is attached to the screw 19.
is arranged between the head 19b and the annular step 18. This pressure spring 21 is fitted with the cylindrical shaft portion 11 at the rear end 9a of the inner hole 9.
We are constantly pushing towards. A cylindrical shank 11 is used to provide a twist-proof connection between the tooling part 3 and the connecting part 2.
The connecting part 2, which has a longitudinal groove 22, has a radially extending screw hole 23 into which a retaining screw 24 is screwed. The inner end of the retaining screw 24 has two flat portions 24a.
(Fig. 3), these flat portions are diametrically opposed to the axis S of the screw and extend parallel to each other and parallel to the axis S, with a distance corresponding to the width B of the groove. Corresponds exactly. In this way, these two flat parts 24
a fits accurately with the side surface 22a of the longitudinal groove 22. This precise, easy-to-machined connection allows torque to be transmitted reliably without play in the screw direction.

The longitudinal groove 22 further has an inclined surface 25 in a part thereof, which forms an acute angle with its axis and extends in a direction away from the axis A towards the free end of the shank 11. tilted relative to the common axis of the parts. The retaining screw 24 has a concentric threaded hole 26 into which a set screw 27 is screwed, which set screw is supported against the inclined surface 25 by a conical shoulder 27a.

When the set screw 27 is tightened, this set screw locks the shaft 1'
) from moving away from the rear surface 9a.

This set screw acts on the shaft 11 in roughly the same direction as the surface spring 21.

In order to create as stable and precise a mating connection as possible between the connecting part 2 and the tooling part 3, the mating bore 9 and the mating bore 9 are
It is preferable that the length of the corresponding portion of the cylindrical shaft portion 11 that engages with the diameter is approximately equal to the diameter, or at most 1.5 times the diameter. 11 are also made so that they are precisely cylindrical and have precise tolerances. (fine thread part 13 and adjustment latch)
The adjustment distances possible with 14 generally require only a relatively small axial adjustment range to be able to set the tools axially relative to each other or to the machine tool. So it was intentionally kept relatively small to maintain stiffness and precision. What is more important is the extremely precise adjustment and extremely rigid connection between the tool coupling part 2 and the tool part B, and even more importantly, once the position of both parts has been adjusted, Chills because it does not change under the processing conditions that occur.

This is primarily ensured by the spring 21. Spring 21 acts continuously. Even if the set screw 27 is loosened due to the need to adjust a tool 28, such as a milling cutter, drill, reamer, precision rotary tool, etc., the spring 21
A force continues to be applied to the shaft portion 11 in the zero direction, and the annular surface 14a of the adjusting nut 14 is kept in contact with the annular surface 10 at all times. As a result, the tool cost 3 can be sensitively adjusted in both axial directions without applying pressure to the tool cost 3 by hand.

It is also ensured that the adjusting nut 14 always bears against the front face 10 under a biasing force. Even finer rotation and adjustment of the thread 13) The rotation of the thread 14 is always in the same direction,
In addition, they are tightened into contact with each other, and at the same time, a machining force directed in the axial direction acts on the tool 3. After the tool 28 is adjusted in the axial direction by the adjusting nut 14, the set screw 27
is tightened again.

Due to the conical shoulder 27a of the set screw 27, it also acts in the 0 direction and prevents the shank 1') from moving in a direction opposite to the 0 direction under any machining conditions. The disc spring 21 and, in addition, the set screw 27 are mainly connected to the adjusting nut 14.
is loosened through the constant contact state of one annular surface 14a with the front surface 10.

In this way, the axial position of tool 28 is ensured to be maintained under all machining conditions once alignment is complete.

As is clear from FIG. 2, the adjustment wheel 14 is provided with a scale 29 around it to facilitate adjustment work.

According to FIG. 4, the tool bone 3' is attached to the plet chuck 30.
It is designed to accommodate 31.

In the embodiment shown in FIG. 4, parts having the same functions are designated by the same reference numerals regarding parts that match those of the embodiment shown in FIGS. 1 to 3. Please refer to the explanation. Tools with flat shafts, such as for example torsion drills, screw taps, countersinks, etc., are accommodated by the collet chuck 30.31.

Because of the different lengths of such tools with a flat shank and the more pronounced wear that can occur, it is advantageous to have a large axial adjustment distance.

Additionally, it is important that such tools with flat shafts do not twist or slide axially within the collet chuck. In order to fully satisfy these requirements,
The longitudinal bore 16 is suitably provided with fine threads 32 at its distal end towards the inward end of the collet 30. A support nut 33, preferably made of spring steel, is screwed onto this fine thread. The support nut 33 has a lateral slot 34 which widens in the direction of the collet 30 to form a wedge, such that at the bottom of the slot only a slight thickness remains in the support nut 33. The support nut 33 extends deeply into the support nut 33. The shank 35 of the tool 36, which is inserted into the collet chuck 30.31, has two diametrically formed opposed flat parts 35a, which are located in the transverse slot 3.
It is supported on the wedge-shaped surface 341 of 4. colette 30
When the coupling nut 3') of is loosened by rotating the tool 36, the support nut 33 is also rotated with it,
As a result, the tool 36 moves approximately g! in the axial direction. It is stipulated.

When the coupling nut 3') is tightened, a back pressure is created towards the support nut 33, which spreads out due to the engagement of the flat portion 35m and the wedge-shaped surface 34&. As a result, the support nut 33 is fixed against further rotation and at the same time constitutes an axial support for the flat part 35m of the shaft 35 by means of its wedge-shaped surface 34m. After this rough adjustment has been made, the tool 36 is adjusted in the manner described above by loosening the set screw 27 and using the adjusting nut 14.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the first embodiment of the present invention, FIG. 2 is a partial view taken in the direction ■ of FIG. 1, and FIG. 3 is a view taken along line 1-1 of FIG. The partial sectional view, FIG. 4, is a longitudinal sectional front view of a second embodiment of the invention. 1... Tool holder 2... Connecting part 3.3゛... Tool bone 9... Mounting inner hole 9a...
Rear end 11... Shaft part 16... Vertical inner hole 17... Penetration inner hole 18... Annular shoulder part
19...Screw 19m...Shaft part 19b・
...Head 20...Screw hole 21...Spring 2
2... Vertical groove 22a... Side surface 23...
Screw hole 24... Holding screw 241L... Flat part 26... Screw hole 27a... Conical shoulder 30.31... Collet chuck 32... Screw hole 33... Support nut 3
4...Horizontal groove 34m...Wedge-shaped surface 35...Shaft % Fraudulent applicant Comment Schietalhalter-und-Perkzuoikfapriek Lonautproning Gesellschaft Mitpeschlenchtelhaftsung

Claims (1)

[Claims] 1. A connecting part having a connecting shaft or a similar part at one end, a connecting part having a mounting bore coaxial with the axis of the connecting shaft at the other end, and a tool receptacle at one end, and the other end having a connecting shaft or a similar part. A tool receiver having a cylindrical shank mounted for axial movement in the mounting bore and having a fine thread in the forward area adjacent to the tool receptacle, and a groove between the connecting part and the cylindrical shank. an axial adjustment having a protruding coupling member and at least one set screw acting on an inclined surface extending obliquely to the axis of the shank and being threaded into a radially extending threaded portion of the coupling part; A holder for a tool, in particular a rotary tool, with a device, the cylindrical shaft (11) having at its free end a coaxial through bore (17) followed by a longitudinal bore (16) of large diameter; Head (19
A screw (19) with b) is placed in the longitudinal bore (16), the shank (19a) of the screw passes through the through-bore (17), and the screw extends into the rear end ( 9a), and is screwed into the screw hole (20) formed in the mounting inner hole (9).
A pressure spring (21) constantly pushing the cylindrical shaft (11) towards the screw head (19b) and the annular shoulder formed between the through bore and the longitudinal bore A tool holder characterized by being arranged between. 2. The tool holder according to claim 1, wherein the pressure spring comprises a plurality of disc springs (21). 3. The cylindrical shaft part (2) has a longitudinal groove (22), the connecting part (2) has a radially extending screw hole (23) into which the retaining screw (24) is screwed, The inner end has two flat portions (24a) which are diametrically opposed to the axis (S) of the screw and extend parallel to the axis (S) with a spacing between them equal to the width of the groove (B). ), which corresponds to the flat part (24a) of the retaining screw (24) and the longitudinal groove (22).
3. Tool holder according to claim 1, characterized in that the side faces (22a) of the tool holder engage in a precise fit. 4. Claim 3, characterized in that the retaining screw (24) has a concentric screw hole (26) into which a set screw (27) with a conical shoulder (27a) is screwed. Tool holder listed. 5. The mounting inner hole (9) and the part of the cylindrical shaft (11) that engages with the mounting inner hole (9) are approximately the same length as the diameter of the shaft (11) or 1.5 times longer than that. The tool holder according to claim 1 or 2, characterized in that the tool holder is straight. 6. The tool receiver (3') has collet chucks (30, 31) as tool receptacles, and the vertical inner hole (9) has a threaded hole (32) at the inner end of the collet chuck (30, 31).
) and widens to form a wedge-shaped portion towards the collet chuck (30, 31).
A support nut (33) having a diameter is screwed into the screw hole (32), and the shank of the tool (36) inserted into the collet chuck (30, 31) is aligned with the wedge-shaped surface () of the horizontal slot (34).
diametrically opposed flat portions (35
The tool holder according to claim 1 or 2, characterized in that it has a). 7. Tool holder according to claim 6, characterized in that the support nut (33) is made of spring steel. 8. Claim 6 or 7, characterized in that the support nut (33) and the threaded hole (32) of the vertical inner hole (9) combined therewith have a fine thread. Tool holder as described.