KR200438118Y1 - Adjustment mechanism - Google Patents

Abstract

The present invention relates to an adjustment mechanism for adjusting the abutment surfaces 22, 26, 27 of the insert pocket wall to change the position of the insert 18 mounted in the insert pocket 16. The adjustment mechanism includes an adjustment screw 38 and an adjustment ball 44 located in the adjustment bore 46. The adjusting ball 44 is located near the insert pocket walls 20 and 24, and the adjusting ball 44 is pressed against the insert pocket walls 20 and 24 when the adjusting screw 38 is tightened. The force applied by the adjustment ball 44 deforms the insert pocket wall in the contact zones 52, 54 between the adjustment ball 44 and the insert pocket walls 20, 24 so that the contact surface 22 required. , 26, 27).

Adjustment, mechanism, insert pocket, insert, contact surface, adjustment ball, adjustment screw, contact

Description

Adjustment mechanism {ADJUSTMENT MECHANISM}

1 is a perspective view of a slotting cutter with one cutting insert removed.

FIG. 2 is a plan view of the insert positioned in the insert pocket of the slotting cutter shown in FIG.

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

4 is a cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is a cross sectional view similar to FIG. 4 except that it is an insert pocket provided with two adjustment mechanisms;

The present invention relates to a position adjustment mechanism of an insert within an insert pocket.

There are many cutting tool related machining operations where it is important to accurately position the cutting edge of the cutting insert mounted on the cutting tool. For inserts clamped in insert pockets formed in the cutting tool, the exact position of the cutting edge depends on the insert and the precision with which the insert pocket is manufactured. Inaccuracy in either of the two factors is particularly responsible for irregular cutting surfaces. For example, slotting cutters with radial inserts with insert pockets cut at opposing surfaces of the cutter body have misalignments between the left and right inserts, and radial and axial deviations. There may be a runout.

The insert, in particular the cutting edge of the insert, can be polished so that all the inserts are evenly mounted on the cutting tool. However, tool insert pockets with two adjacent insert pocket walls cannot be polished, so that there will be some inaccuracy at the position of the mounted insert due to the positional inaccuracy of the insert pocket wall which abuts the insert. It may be.

In view of the above, it is evident that there is a need to provide an adjustment mechanism that eliminates or reduces the positional inaccuracy of the insert pocket wall in contact with the insert, thereby reducing the positional inaccuracy of the insert mounted in the insert pocket. Do.

It is an object of the present invention to provide a mechanism for adjusting the abutment feature of an insert pocket that changes the position of an insert mounted within the insert pocket.

According to the present invention, there is provided an adjusting bore having a front portion and a rear portion located near the insert pocket wall, and an adjusting member having a front end adjacent to the front portion of the adjusting bore and positioned within the rear portion of the adjusting bore. An insert pocket adjustment mechanism is provided in the cutting tool configured to apply a predetermined force to the insert pocket to deform through the deformation the position of the at least part of the insert pocket wall when pressing the member into the front portion of the adjusting bore. .

According to a preferred embodiment of the present invention, at least part of the rear portion of the adjusting bore is threaded, and the adjusting member is an adjusting screw having a front end and a threaded rear end and screwed with the rear portion of the adjusting bore, The front end of the screw is pressed towards the front portion of the adjusting bore when the adjusting screw is tightened.

According to another preferred embodiment of the present invention, the adjustment mechanism further comprises an adjustment ball located in the front portion of the adjustment bore adjacent the insert pocket wall, wherein the front end of the adjustment screw engages the adjustment ball when tightening the adjustment screw. And by pressing the adjusting ball in contact with the front portion of the adjusting bore, the adjusting ball applies a predetermined force to the insert pocket wall to change the position of at least some of the insert pocket walls through deformation.

According to another preferred embodiment of the present invention, the adjustment ball is pressed in contact with the front portion of the adjustment bore in the first and second contact zones, the first contact zone being deformed such that the rear contacting surface of the insert pocket is It will expand into the insert pocket.

Preferably, the anterior portion of the adjusting bore is in the form of a flat truncated cone.

Typically, the cross-sectional shape of the front portion of the adjustment bore, which passes through the first and second contact zones and is taken within the transverse plane of the adjustment bore, is generally oval.

Also, typically, the cross section of the front portion of the adjustment bore, which passes through the first and second contact zones and is taken within the longitudinal plane of the adjustment bore, has a wedge-shaped shape.

If necessary, the front end of the adjusting screw is provided with a conical recess.

For good understanding, the present invention will now be described by way of example with reference to the accompanying drawings.

Although the present invention will be described for slotting cutters, it should be understood that the same applies to other types of cutting tools with replaceable cutting inserts mounted in insert mill pockets and general milling cutters.

First, FIGS. 1 and 2 are shown, which show a slotting cutter 10 comprising a tool body 12 driven by a shaft 14. The slotting cutter has an axis of rotation 15. The tool body 12 is provided with a plurality of cutting insert pockets 16 for receiving the cutting inserts 18. Each insert pocket 16 includes a side wall 20 having a lateral abutment face 22 and a back wall 24 having an inner back abutment face 26 and an outer back abutment face 27. do. The insert 18 passes through a screw bore 29 in the insert (see FIG. 3) to a clamping screw 28 received in a threaded screw bore 30 formed in the base 32 of the insert pocket 16. By the insert pocket 16. The insert has four peripheral walls 31a, 31b, 31c and 31d that are generally upright (see FIG. 4). One peripheral wall 31a of the insert 18 abuts the lateral abutting surface 22, and the adjacent peripheral wall 31b of the insert is an inner rear abutment surface 26 and an outer rear abutment surface ( Abutting 27) to determine the position of the cutting insert 18 in the insert pocket 16.

In the slotting cutter of the type shown, the insert 18 is staggered on the tool end face 33 and the tool back face 34 to define a "left" insert and a "right" insert, respectively. For precise machining of the workpiece, it is important that the cutting edge 36 of the cutting insert mounted on the tool is correctly aligned. Incorrectly aligned cutting edges may cause radial deviation and / or mismatch between the left and right inserts. Radial deviation of a given insert is related to the situation in which one insert is displaced outward along the radial direction with respect to the other insert, which displacement is the radial translation of the insert without rotation about the clamping screw of the insert. Provided by translation. Mismatch between the left insert and the right insert relates to the situation where one or both of the inserts are rotated about the clamping screws of the insert such that the cutting edges of the inserts are rotationally displaced relative to one another. Thus, for precise machining, the radial deviation and mismatch between the left and right inserts must be eliminated or reduced to a minimum.

Assuming that the insert has been manufactured with the highest precision, the present invention provides an adjustment mechanism for adjusting the position of the abutment surface of the insert pocket by the adjustment screw 38. Preferably, two adjustment screws are used as will be described in detail below. Specifically, with respect to the slotting cutter shown in Fig. 1, the position of the rear abutment surface of the insert pocket is the minimum value at which the misalignment and radial deviation between the left and right inserts are eliminated or required by adjusting the adjusting screw. To be reduced.

Referring to Figure 3, the adjusting screw 38 is provided with a front end 40 and a rear end 42 provided with a socket 43, such as a hexagonal or spline socket for receiving a wrench to tighten or loosen the adjusting screw. Has The adjustment ball 44 may be positioned proximate to the front end 40 of the adjustment screw 38 and engaged by the front end 40 of the adjustment screw 38. The adjusting screw and adjusting ball are located in the adjusting bore 46 provided in the tool body 12. The adjusting bore 46 has a rear portion 48 which is threaded at least in part to engage with the adjusting screw 38 and the front portion 50 which is at least partially conical in shape to engage with the adjusting ball 44. As will be described in detail below, the front portion 50 is preferably in the form of a flat truncated cone.

As the adjusting screw 38 is tightened, the adjusting screw proceeds into the adjusting bore 46 and presses the adjusting ball 44 in contact with the front portion 50 of the adjusting bore. The adjusting screw applies a predetermined force on the adjusting ball which in turn applies a predetermined force on the front portion 50 of the adjusting bore in the first contact region 52 and the second contact region 54. The front end 40 of the adjustment screw 38 is preferably provided with a recess 56, which can be, for example, conical or spherical in shape. This increases the contact area between the adjusting screw and the adjusting ball as compared to the case where the front end 40 is flat. For the case of a conical shaped recess as shown in the figure, the contact zone 58 is a circular rim that is the base of the conical cutout zone. When adjusting the position of the insert pocket wall by the adjusting screw 38 in the vicinity of the first contact zone 52, the clamping screw 28 is loosened or completely removed.

Referring now to both Figures 3 and 4, it should be noted that the cross-sectional shape of the front portion 50 of the adjusting bore is asymmetric. In practice, the anterior portion 50 has a flat truncated cone shape. The cross section of the front portion 50 shown in FIG. 3 is in the radial plane (ie, the plane perpendicular to the axis of rotation 15 of the slotting cutter, or the first contact zone 52 and the second with respect to the adjustment bore 46). In the longitudinal plane of the adjusting bore, respectively passing through the contact zone 54, and in figure 3 have a frustum shape taken in the axial plane, ie in the plane including the axis of the truncated conical surface. In other words, the cross section of the front portion 50 taken in the longitudinal plane of the adjusting bore passing through the first contact zone 52 and the second contact zone 54 respectively has a wedge-shaped shape. The cross section of the front portion 50 shown in FIG. 4 is an axial plane (ie, a plane parallel to the axis of rotation 15 of the slotting cutter, or the first contact region 52 and the second with respect to the adjustment bore 46). Taken in the transverse plane of the adjusting bore, respectively passing through the contact zone 54, and as can be seen the shape in Figure 4 is almost elliptical. This particular shape of the front portion 50 of the adjustment bore allows the adjustment ball 44 to apply force to the front portion 50 only in the first contact region 52 and the second contact region 54, thereby applying the applied force. Concentrate in these areas. On the other hand, if the front portion 50 was not a flat truncated cone, but a general truncated cone, then the cross-sectional shape shown in FIG. 4 would have been circular rather than elliptical, and the adjustment ball 44 would have two separate contact zones 52, 53. It would have been in contact with the front part of the adjusting bore, rather than in a continuous circular section. As shown in FIG. 3, as a result of the elliptical cross-sectional shape of the front portion 50, the force applied by the adjusting ball on the front portion 50 of the adjusting bore is generally radial.

As can be seen in FIGS. 3 and 4, the insert pocket back wall 24 is relatively thin in the region adjacent the front portion 50 of the adjusting bore 46. Thus, the force applied by the adjusting ball 44 on the first contacting zone 52 deforms the rear wall 24 of the insert pocket in the region of the inner rear abutting surface 26, so that the rear abutting surface ( Allow 26) to expand into the insert pocket. On the other hand, the second contact zone 54 in the front part 50 of the adjusting bore is supported by the relatively bulky zone of the tool body 12 (left side of the second contact zone in FIG. 3). Thus, the main effect of the force applied by the adjusting ball 44 on the second contact zone 54 will only slightly squeeze the tool body near the second contact zone 54.

According to the present invention, the deformation of the insert pocket wall following the tightening of the adjusting screw is used to correct the inaccuracy of the insert pocket wall position. Specifically, for the slotting cutter shown in the figures, the deformation of the insert pocket back wall 24 in the region of the inner back abutment surface 26 following the tightening of the adjustment screw 38 will be described below, but the insert It is used to eliminate mismatches between the left and right inserts due to incorrect machining of the pocket back wall 24.

The drawing shows only one adjustment mechanism of the present invention. In this case, the tightening of the screw deforms the inner rear abutment surface 26, causing it to expand into the insert pocket, thereby displacing the inner rear abutment surface mainly radially outward. As a result, the insert 18 will move outward in the radial direction. However, for inserts that are radially displaced from the inner rear abutment surface 26 and remain in contact with the lateral abutment surface 22 and the outer rear abutment surface 27, the insert is a clamping screw ( 28 and rotate clockwise (relative to the insert shown in FIG. 4). This type of adjustment can be used to correct mismatches between the left and right inserts of the cutting tool shown in FIG. 1, which inserts require a clockwise rotation around the clamping screw. do. In certain non-limiting examples, the thickness of the insert pocket wall between the inner rear abutment surface 26 and the first contacting zone 52 in contact with the adjustment ball is approximately 0.34 mm. In general, the deformation of the inner rear abutment surface causes a displacement of several hundreds of millimeters, typically 2/100 mm. In general, this deformation is a plastic deformation so that once the position of the insert has been adjusted by tightening the adjustment screw, it is impossible to cancel this action by loosening the adjustment screw.

To correct the radial deviation of the insert, or to correct the mismatch, the insert shown in FIG. 4 requires a counterclockwise rotation about the clamping screw, requiring two adjustment mechanisms. Referring to FIG. 4, it can be seen that the adjusting ball 44 is disposed near the inner rear abutting surface 26 of the rear wall 24. The adjusting screw 38 (not shown in Fig. 3) and the adjusting ball 44 constitute the first adjusting mechanism. It is evident that a second adjustment mechanism comprising a second adjustment screw (not shown in the figure) and a second adjustment ball associated therewith may be provided near the outer rear abutment surface 27. 5 shows a second adjusting ball 60 of this second adjusting mechanism. By tightening the adjusting screws of the first adjusting mechanism and the second adjusting mechanism, both the inner rear abutting surface 26 and the outer rear abutting surface 27 are deformed, and each expands into the insert pocket, so that the inner rear abutment is provided. Face 26 and outer back abutment face 27 will be displaced radially outward. If both the inner rear abutment surface and the outer rear abutment surface are displaced radially outward at the same distance, the insert will have all three abutment surfaces 22, 26, 27 without rotation about the clamping screw 28. It will move radially outward while maintaining contact with it.

It should be understood that additional third adjustment mechanisms may be provided for axial adjustment of the insert. Referring to Figure 5, the third adjustment mechanism will be positioned in such a way that the adjustment ball associated with it is located near the lateral abutting surface 22.

Although the adjustment mechanism has been described using the adjustment screw and a separate adjustment ball, it can be conceived to use only the adjustment screw with the front end 40 of the screw in direct contact with the front portion 50 of the adjustment bore.

While the invention has been described in some detail, it should be understood that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the claims below. For example, it is clear that the pressing of the contact ball 44 in contact with the front portion 50 of the adjusting bore does not have to be carried out by the adjusting screw 38. This action may be performed by any suitable adjusting member adapted to engage the adjusting ball at the front end and enter the adjusting bore 46.

Provides an adjustment mechanism that eliminates or reduces the positional inaccuracy of the insert pocket wall in contact with the insert, to reduce the positional inaccuracy of the insert mounted within the insert pocket.

Claims (9)

delete delete Insert pocket adjustment mechanism for insert pocket of cutting tool, An adjustment bore 46 having a front portion 50 and a rear portion 48, the front portion 50 being located near the insert pocket wall 24, An adjustment member 38 positioned in the rear portion 48 of the adjustment bore 46 and having a front end 40 adjacent the front portion 50 of the adjustment bore 46, An adjustment ball 44 positioned in the front portion 50 of the adjustment bore 46 adjacent the insert pocket wall 24, When the adjusting member 38 is pressed into the front portion 50 of the adjusting bore 46, the front end 40 of the adjusting member 38 engages with the adjusting ball 44 to adjust the adjusting ball 44. Force 44 to contact the front portion 50 of the adjustment bore, so that the adjustment ball 44 is adapted to change the position of at least a portion of the insert pocket wall 24 through deformation. Force is applied to the insert pocket wall 24, The adjustment ball 44 is pressurized to contact the front portion 50 of the adjustment bore 46 in the first and second contact zones 52, 54, thereby deforming the first contact zone 52. As a result, the rear abutment surfaces (26, 27) of the insert pocket are expanded into the insert pocket. 4. The insert pocket adjustment mechanism of claim 3 wherein the front portion (50) of the adjustment bore (46) is in the form of a flattened truncated cone. 5. Cutting according to claim 4, characterized in that the cross section of the front portion 50 of the adjusting bore, which passes through the first and second contacting zones and is taken within the transverse plane of the adjusting bore, is generally oval. Insert pocket adjustment mechanism of the tool. 6. The cutting tool according to claim 5, wherein the cross section of the front portion of the adjusting bore that passes through the first and second contact zones and is taken within the longitudinal plane of the adjusting bore has a wedge shape. Insert pocket adjustment mechanism. delete 4. The adjusting member (38) according to claim 3, wherein the adjusting member (38) is an adjusting screw that is screwed into the rear portion (48) of the adjusting bore (46), and the adjusting screw (38) is the front of the adjusting bore (46). Having a front end 40 adjacent the portion 50, when tightening the adjustment screw the adjustment screw is pressed into the front portion 50 of the adjustment bore 46 and the front end of the adjustment screw 38. 40 engages the adjustment ball 44 to force the adjustment ball 44 into contact with the front portion 50 of the adjustment bore, resulting in deformation of the insert pocket wall 24. Insert pocket adjustment mechanism of a cutting tool, characterized in that the adjustment ball (44) is configured to apply a force to the insert pocket wall (24) to change the position of at least a portion. 9. The insert pocket adjustment mechanism of claim 8 wherein the front end of the adjustment screw is provided with a conical recess.

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