JP2504271Y2 - Turret head for lathe - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention includes a tool holder and a substantially cylindrical rotating disk which is rotatable and has a plurality of tool holder receiving holes formed close to each other. It is arranged with a gap in the circumferential direction and extends parallel to the axis of the rotating disc, and has an end face that is arranged at a right angle to the axis of the rotating disc, and the rotating disc is movable in the radial direction with respect to that axis. The tool holder has a cylindrical shank that fits precisely into the holder receiving hole, the concentric annular surface of the tool holder that surrounds this shank and extends at a right angle to its axis, and the tightening member moves in the radial direction. The turret head for a lathe having a tightening member that cooperates with the tightening member so that the end surface surrounding the corresponding holder receiving hole and the annular surface of the tool holder are pressed against each other.

[0002]

2. Description of the Prior Art In conventional numerically controlled lathes, turret heads as described above are used to receive a plurality of preset tools which project beyond the front end face of a cylindrical rotating disk. The axis of rotation of the rotating disc is usually arranged horizontally and parallel to the axis of the work piece mounting spindle. Multiple replaceable rotating disks can be prepared.

[0003]

The "cylindrical shank tool system" (VDI-Richtlinien.
VDI3425 2nd page, November 1972) was developed. In this system, the tool holder for receiving each tool has a cylindrical shank having a flat surface on one side and teeth extending transversely to the axis of the shank. The cylindrical shank is provided with a clamping member for sliding in the rotating disc, the clamping member having teeth on the meshing teeth of the shank. With this tightening member, the shank is inserted into the holder receiving hole and the tool holder is pressed in the radial direction such that the annular surface thereof engages with the end surface of the rotating disk.

[0004]

[Problems to be Solved by the Invention] Although the shank and the holder receiving hole are closely fitted to each other, since the shank can slide into the holder receiving hole without using an excessive force, the shank and the holder receiving hole are There must always be some play in. The clamping member exerts a force acting transversely to the shank axis and to it only on one side. Therefore, the shank is pressed to the side of the holder receiving hole farther from the tightening member. As a result, when the tool holder is tightened, the shank axis of the tool holder is eccentric to the axis of the holder receiving hole and is displaced in parallel. The precision of the assembly work and the precision of the repeated work, and consequently the production precision, are affected by the worse. Furthermore, the pressure of the shank which abuts the wall of the holder receiving hole creates a considerable frictional force acting between these two parts and between the two sets of interlocking teeth. This considerable frictional force prevents the shank from moving axially within the holder receiving hole, so the annular surface of the tool holder is
It may not be pressed with sufficient force against the end face of the rotating disc, or often practically not at all. Therefore, the lateral forces acting on the tool are not well or completely transmitted from the annular end face to the end face of the rotating disc, and the force is transmitted only via the shank of relatively small diameter. Moreover, torque must be transmitted to the shank only from the clamping member, which induces deformation of the two sets of teeth.

Another drawback of this known connecting means between the tool holder and the rotating disc is that the holder receiving holes of the rotating disc are all made to the same size. The tool holder is smaller than the diameter of the receiving hole that should be connected to the rotating disc,
Or if it is large, there is no other means than interposing an adapter. However, the intervention of the adapter increases the amount of protrusion of the tool, that is, the tool is located at a large distance from the end face of the rotating disc. This not only impairs stability, but also results in work environment constraints and motion limitations. Furthermore, the connection between the tool holder and the rotating disc can be broken as a result of some unpredictable overload. In this case, the entire rotating disk usually has to be replaced with a new one. Moreover, in the known "cylindrical shank tool system", the holder receiving hole must have a relatively large diameter, which is one and a half times the diameter of the shank. This leads to an increase in material consumption during the manufacture of the tool holder and also an increase in the weight of the tool holder. Furthermore, shanks with a relatively large length are inconvenient for automatic tool holder replacement.

This invention improves the turret head for a lathe as a basic object, and when the tool holder is tightened to the rotating disk, the axial movement of the tool holder and the receiving hole does not occur in the radial direction, and the annular surface is Pressed against the end face of the rotating disc, which is fixed in the direction of rotation with the spindle, with a considerable pressing force, thereby improving the precision of the assembly and mechanical function on the one hand, and on the other hand, the maximum proportion of torque due to the frictional contact to the rotating circle. Guarantees the transmission from the plate to the annular surface,
Provided is a coupling portion between a tool holder and a rotating disc that is resistant to bending, is non-vibrating, and can be easily replaced when its components are damaged. It is a further object of the present invention to provide a turret head that can also be connected to a rotating disc so that the distance that the tool projects from the rotating disc is as short as possible.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention has a substantially cylindrical shape which is rotatable and has a plurality of insertion disk receiving recesses (5) formed close to the periphery. A rotary disc (4) in the shape of a circle and a tool holder (16), the insertion disc receiving recesses (5) being arranged at intervals in the circumferential direction of the rotary disc (4), The insertion disc receiving recess (5) has a flat bottom portion (5a) extending parallel to the axis of the plate (4) and located in a radial plane with respect to the axis (A ₂ ) of the rotating disc (4). The insertion disc (6) is arranged on the insertion disc (6)
Is provided with a holder receiving hole (8) concentrically with the insertion disc receiving recess (5), and a flat bottom (5a) of the insertion disc receiving recess (5) has a flat rear surface of the insertion disc (6). The end face (6b) is brought into contact, and the insertion disc (6) penetrates the insertion disc (6) to receive the insertion disc receiving recess (5).
A plurality of fixing screws (7) screwed to the flat bottom portion (5a) of the
(7) penetrates the rotary disc (4) and is screwed into the flat bottom portion (5a) of the insertion disc receiving recess (5), and the insertion disc (6) is in the area of the holder receiving hole (8). Conical shape screwed into _two radially extending threaded holes (9, 10) facing each other and a threaded hole (9) located inward with respect to the axis (A ₂ ) of the rotating disk (4). Recess (1
An inner tightening screw (11) having ₂ ) and an outer tightening screw (13) having a conical end (14) screwed into a screw hole (10) located outwardly with respect to the axis (A ₂ ). The tool holder (16) has a cylindrical shank (17) precisely fitted in the holder receiving hole (8) and a concentric annular surface (22) surrounding the shank (17) and extending at right angles to its axis. The shank (17) has a lateral hole (18), and a tightening bolt (19) is arranged in the lateral hole so as to be slidable in the radial direction. A conical end (20) cooperating with the conical recess (12) of the tightening screw (11) and at the other end a conical end (14) of the outer tightening screw (13). It has a shaped recess (21) and a screw hole from the end face (6a) of the insertion disc (6).
The distance (a1) to the axis (A ₂ ) of (9, 10) is the annular surface (22).
From the axis of the transverse bore (18) (A ₅₎ from greater than the distance (a2) of, whereby when the threaded outer fastening (13) is tightened, the screw is the insertion disc annular surface (22) It is constructed so as to act on the tightening member (19) in a direction in which the end face (6a) and the end face (6a) are pressed against each other, and the insertion disc (6) is provided on the outer peripheral surface (6c) of the axial line (A ₄ ) has two recesses (26) arranged at two lateral positions, and the rotary disc (4) has recesses.
In the area of (26), there is a screw hole (27) extending substantially in the radial direction with respect to the axis (A ₂ ) of the rotating disk (4), and the screw hole (27) has a tip end in a recess (26). The adjusting screw (28) with which the abuts is screwed.

[0008]

In this invention as described above, when the insert disc is inserted into the corresponding insert receiving recess of the rotary disc, the connecting portion, which is extremely short in structure and therefore considerably non-vibrating, is connected to the tool holder and the rotary disc. Obtained between the boards. Since the insertion disc can be manufactured with high accuracy in the same manner as the holder receiving hole provided therein, the manufacturing accuracy can be improved. The separate manufacture of the insert disc also simplifies the formation of the clamping connection between the shank of the tool holder and the rotating disc. In particular, if the components of the fastening connection are damaged, these components can be easily replaced without having to replace the rotating disc itself. Insert tool holders with larger or smaller diameter shanks without intervening adapters by replacing the insert disc with another one with larger or smaller diameter holder receiving holes It is also possible to insert directly into the disc. A further advantage is obtained by using the coupling device disclosed in the above-mentioned DE-PS3108439 specification, which is used only as a coupling pad for the tool.
A particularly stable and precise connection between these two parts is provided, compared to the first-mentioned ordinary connection means between the tool holder and the rotating disc. By using the radially movable tightening member, it is possible to prevent the shank from being radially pushed toward one side of the holder receiving hole when the outer tightening screw is tightened. Since no radial force acts on the shank, no movement of the shank axis with respect to the holder receiving hole axis occurs, so that both axes are always precisely aligned axially. This ensures high precision assembly and reconfiguration. The absence of lateral pressure against the wall of the holder receiving hole further ensures that the force exerted by the clamping screw is transmitted to the shank via the clamping member. The tightening force of the radially outer tightening screw causes a reaction force of the same magnitude and opposite direction to the radially inner tightening screw, thereby doubling the tightening force of the outer tightening screw. Due to the presence of the conical end and the recess, the clamping force acting radially on the clamping screw results in a force acting axially. Since the common axis of the tightening screw and the tightening member is displaced in the axial direction, the tightening member moves in the axial direction by the component force acting in the axial direction, and as a result, the end face of the rotating disk is increased with an increased load force. Press the annular surface against. Due to the strong and even pressing action of the annular surface against the end surfaces, the high torque portion is transmitted by frictional engagement through these surfaces. The remaining torque is transmitted via the tightening screw and the tightening member. It is also important that the forces acting laterally on the tool are transferred from these two surfaces over a relatively large diameter when the annular surface and the end surface maintain good contact. . This increases manufacturing accuracy and reduces the risk of tool vibration. In addition, high cutting forces and thus short machining times are obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be described in detail below with reference to the embodiments shown in the drawings. The rotary workpiece spindle 1 has a chuck 2 for clamping and holding the workpiece W. The turret head 3 carries a rotating disc 4, which is rotatable about an axis A ₂ parallel to the spindle axis A ₁ .
It is fixed at a predetermined angular position. The turret head 3 is further movable in the direction of the axis A ₂ . The rotating disk 4 is
A plurality of cylindrical insertion disc receiving recesses 5 are provided in the vicinity of the circumferential surface 4b. A cylindrical insertion disc 6 is arranged in the insertion disc receiving concave portion 5, and the insertion disc is inserted into the rotary disc 4 over a considerable length, and the entire surface 6a is a very small distance, that is, about 1 mm. Is arranged so as to project beyond the end surface 4a of the rotary disc 4. The insertion disk 6 has a rear surface 6b
Are arranged in contact with the flat bottom 5a of the insertion disc receiving recess 5, which lies in one plane radially arranged with respect to the axis A ₂ of the rotating disc 4. Insert disk 6
Are detachably connected to the rotary disc 4 by a plurality of fixing screws 7 which penetrate the insertion disc 6 and are screwed into screw holes (not shown) formed in the bottom portion 5a.

A tool holder receiving hole 8 is formed in the insertion disc 6 concentrically with the front surface 6a. The insert disc 6 further has two diametrically opposed, radially extending screw holes 9, 10 in the area of the cylindrical receiving hole 8. These screw holes 9,
10 extends in the radial direction with respect to both the axis A ₃ of the tool holder receiving hole 8 and the axis A ₂ of the rotating disk 4. An inner clamping screw 11 is screwed into a screw hole 9 located inwardly with respect to the axis A ₂ of the rotary disc 4, the clamping screw 11 having a conical recess 12. An outer clamping screw 13 having a conical end 14 is screwed into the radially outer screw hole 10. Moreover, another fixing screw 15 arranged on the insertion disc 6 and projecting beyond the end face 6a thereof engages with the holding hole of the tool holder 16.

The tool holder 16 has a cylindrical shank 17 which can be inserted into the tool holder receiving hole 8 in a very closely fitted state. The shank 17 has a lateral hole 18 in which a locking member 19 slides in the radial direction. This tightening member
19 has a conical end 20 at one end and a conical recess 21 at the other end. Through the conical end 20 and the recess 21, the tightening member 19
Co-operates with two clamping screws 11,13. The shank 17 of the tool holder 16 is further surrounded by a concentric annular surface 22. The distance a1 from the end surface 6a of the axis A ₄ of the screw holes 9 and 10 is larger than the distance a2 of the axis A ₅ of the lateral hole 18 from the annular surface 22. The two holder 16 is formed in any way at its front free end, remote from its shank, to accept a wide variety of tools, such as boring heads, rotary chisel or cutter heads and the like. If desired, the tool holder is also made as a one-piece piece with a cutter head.
Furthermore, the tool holder 16 comprises a coolant supply passage 23.
Coolant is supplied to the passage 23 through a radial coolant supply hole 24 of the rotating disk 4. It is also possible to supply air to the tool holder through another radial hole 25.

Normally, the insert disc 6 remains connected to the rotating disc 4. Only tool holders with pre-installed tools are replaced. To change one tool, only the outer clamping screw 13 needs to be loosened until its conical end 14 no longer projects into the holder receiving hole 8. To operate the tightening screw 13, a motor driven screwdriver can be used. When the outer clamping screw 13 is loosened, the clamping member 19 is slid until its conical end 20 is withdrawn and the inner clamping screw 11 forms a conical cavity 12. The tool holder 16 is thereby removed with the tool from the rotating disc 4 to the left. After another tool holder has been inserted, the outer clamping screw 13 is screwed radially inward, the conical end 14 of which is the conical recess 21 of the clamping member 19.
Contact with the inner clamping screw due to the conical end 20
Press into the conical recess 12 of 11.

Although the tightening force acting on the outer tightening screw 13 in the radial direction is the same as the inner tightening screw 11, the tightening force acting on the inner tightening screw 13 in the radial direction is equal to the tightening force. A reaction force acting in the opposite direction is applied. Due to the axial displacement of the axes A ₄ , A _5, the two clamping screws 11, 13 exert equally large axial component forces via the conical ends 14, 20 and the conical recesses 12, 21. Therefore an external clamping screw with a cone angle of 90 °
The tightening force of 13 acts twice as much as the tightening force, and it is pressed against the annular surface 22 of the tool holder with a force twice as large as the tightening force of the tightening screw 13. Tightening screws 11 and 13 are tightening members.
Since they act in a diametrically opposed manner toward 19, the surfaces 6a,
The compression force applied between 22 is uniform over the entire circumference. Furthermore, since the tightening member 19 is slidable in the lateral hole 18, the shank 17 is not subjected to a force acting on only one side. As a result, the axis of the tool holder 16 is exactly aligned with the axis A ₃ of the receiving hole 8. As can be further seen from FIG. 2, the uniform pressure of the annular surface 22 against the end surface 6a makes it possible to keep the shank 17 axially relatively short. It suffices if this axial length is approximately equal to the diameter of the shank 17.

All insertion discs 6 for use with a given rotating disc 4 preferably have the same outer diameter.
Individual insert discs with the same outer diameter can in some cases have a relatively large diameter holder receiving hole 8'and in other cases have a relatively small diameter holder receiving hole 8 ". Therefore, it is possible to fit it directly to the insert disc for tool holders with large or small diameter shanks, depending on the particular work purpose to be carried out, for which the insert disc has a locking screw 7. It is exchanged after being loosened.

[0015]

As described above, according to the present invention, when the tool holder is tightened to the rotating disk, the radial movement of the tool holder and the hole of the receiving hole in the radial direction does not occur, and the annular surface rotates with the spindle. Is pressed in the direction with a considerable pressing force against the end face of a fixed rotating disc, thereby improving the precision of assembly and mechanical functioning on the one hand, and on the other hand the maximum proportion of torque from the rotating disc due to frictional contact from the rotating disc. Guaranteed to be transmitted to surfaces, resists bending, is non-vibrating, and can be easily replaced in the event of component damage, etc., and minimizes the distance the tool projects from the rotating disc Thus, the compatibility of the insert disc, which also allows the tool to be connected to a rotating disc, causes overloads due to programming errors and tool breakage, which can lead, for example, to catch holes. This is effective when a loss occurs, and all parts that are subject to wear, especially tightening screws, tightening members, and even the insertion disc, can be easily replaced as necessary.The axis of each insertion disc receiving recess The distance of the rotating disc from the circumferential surface is shorter than the radius of the insert disc receiving recess, so that each insert disc protrudes somewhat from the outside of the circumferential face, which allows easy access to the clamping screws. , The rotating disc is kept somewhat smaller in diameter so as to reduce its weight, and the inserting disc has two recesses on its circumferential surface facing two positions transverse to the axis of the screw hole, The rotating disc has a threaded hole in the area of the recess, which thread extends substantially radially with respect to the axis of the rotating disc and is screwed with an adjusting screw which engages the corresponding recess. Each insertion disc is fixed by an adjusting screw so that it does not rotate. Moreover angularly adjustable, so further inserted disc is tightened to the insertion disc receiving recess corresponding with two corresponding adjustment screw,
When adjusting the position of the insert disc in the circumferential direction of the insert disc receiving recess of the rotary disc without causing play, pass through the insert disc and screw it into the flat bottom of the insert disc receiving recess. After loosening the fixed fixing screws, loosen one of the adjusting screws that is screwed into the screw hole of the rotating disc and the tip of the adjusting disc comes into contact with the concave part of the inserting disc. It is possible to connect the insertion disc to the rotation disc by fixing the insertion disc to the rotation disc by turning and rotating the position adjustment and screwing the fixing screw.
It is firmly held in that position, and by mounting the tool holder on this insertion disc, the tool holder can be stably held in a predetermined position, and the position adjustment for that can be easily performed by a simple operation. Moreover, since it is not necessary to provide any processing part on the tool holder to perform such position adjustment, there is no risk of damage to the processing part due to screws during position adjustment, and there is no hindrance to normal tool holders. There is an effect that it can be used without.

[Brief description of drawings]

FIG. 1 is a schematic side view of a numerically controlled lathe having a turret head according to the present invention.

2 is a cross-sectional view of the embodiment of the present invention taken along line II-II of FIG.

3 is a cross-sectional view taken along the line III-III of FIG.

[Explanation of symbols]

 1 Workpiece spindle 2 Chuck 3 Turret head 4 Rotating disc 4b Circumferential surface 5 Inserting disc receiving recess 5a Flat bottom 6 Inserting disc 6a Front face 6b Rear face 7 Fixing screw 8 Tool holder receiving hole 9, 10 Screw hole 11 Inside Tightening screw 12 Conical recess 13 Outer clamping screw 14 Conical end 15 Fixing screw 16 Tool holder 17 Cylindrical shank 18 Lateral hole 19 Tightening member 20 Conical end 21 Conical recess 22 Annular surface 25 Recess 27 Screw Hole 28 adjusting screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Otto Ekul Germany, Day-7121 Leichgau, Friedenstraße 9th (72) Creator Helmut Fiegel Germany, Day-7141 Schweiberdingen, Asperger Shutrase No. 1 (56) References JP-A-58-51004 (JP, A) JP-A-54-75690 (JP, A) Jikkoku 50-40074 (JP, Y2)

Claims (4)

(57) [Scope of utility model registration request] 1. A substantially cylindrical rotating disk (4) which is rotatable and has a plurality of insertion disk receiving recesses (5) formed close to the periphery, and a tool holder (16), The insertion disc receiving recesses (5) are arranged at intervals in the circumferential direction of the rotating disc (4), extend parallel to the axis of the rotating disc (4), and It has a flat bottom portion (5a) located in a plane in the radial direction with respect to the axis (A ₂ ), and has an insertion disc body receiving concave portion.
An insertion disc (6) is provided in (5), and a holder receiving hole (8) is provided in the insertion disc (6) concentrically with the insertion disc receiving recess (5). The flat rear end face (6b) of the insertion disc (6) is brought into contact with the flat bottom portion (5a) of the plate receiving recess (5), and the insertion disc is inserted.
(6) is removable to the rotating disc (4) by a plurality of fixing screws (7) which penetrate the insertion disc (6) and are screwed into the flat bottom portion (5a) of the insertion disc receiving recess (5) Is connected to the insertion disc
In the area of the holder receiving hole (8), (6) is inward with respect to two diametrically opposed radially extending screw holes (9, 10) and the axis (A ₂ ) of the rotating disc (4). An internal clamping screw (11) with a conical recess (12) that is screwed into the screw hole (9) located, and the axis
(A ₂ ) has an outer clamping screw (13) with a conical end (14) screwed into a screw hole (10) located outside, and the tool holder (16) has a holder receiving hole (8). ) Has a cylindrical shank (17) precisely fitted to it and a concentric annular surface (22) surrounding this shank (17) and extending at a right angle to its axis, the shank (17) having a lateral hole (18). A tightening bolt (19) is provided in the lateral hole so as to be slidable in the radial direction, and the tightening bolt (19) has a conical recess (12) of the inner tightening screw (11) at one end. It has a cooperating conical end (20) and at the other end a conical end (1) of the outer clamping screw (13).
4) has a conical recess (21) cooperating with the end face (6a) of the insertion disc (6) to the axis (A ₂ ) of the screw holes (9, 10) (a
1) is greater than the distance (a2) from the annular surface (22) to the axis (A ₅ ) of the lateral hole (18), whereby the outer clamping screw (1
When 3) is tightened, this screw moves the annular surface (22) and the end surface (6a) of the insertion disc into pressure contact with each other.
It is configured to act on 9), and the insertion disk (6) is arranged at two positions in the lateral direction with the axis (A ₄ ) of the screw holes (9, 10) sandwiched in the outer peripheral surface (6c). The rotating disk (4) has two recesses (26) formed in it, and the axis of the rotating disk (4) is within the area of the recess (26).
(A ₂ ), an adjusting screw having a screw hole (27) extending substantially in the radial direction, the tip of which abuts the recess (26) in the screw hole (27).
Turret head for lathe, characterized in that (28) is screwed. 2. A front surface (6a) of the insertion disc (6) is a rotating disc.
The turret head for a lathe according to claim 1, wherein the turret head protrudes beyond the end surface (4a) of (4). 3. All insert discs used for rotating discs (4)
Although (6) has the same diameter, the receiving holes (8, 8 ',
A turret head for a lathe according to claim 1, characterized in that 8 ") have different diameters. 4. The distance from the circumferential surface (4b) of the rotating disc (4) to the axis (A ₃ ) of the insertion disc receiving recess (5) is shorter than the radius of the insertion disc receiving recess (5). The turret head for a lathe according to claim 1, wherein: