Fully floating high precision cutter holder

Abstract

To provide a full floating high precision cutter holder for obtaining high precision concentricity between an axis line of a hole expanding and hole correcting cutter and a bottom hole to be machined.SOLUTION: A cutter holder comprises a holder body and a cutter clamping rod. In the holder body, a rod accommodating chamber is provided. A middle portion and a rear end of the cutter clamping rod are provided in the rod accommodating chamber, a front end of the cutter clamping rod extends from the rod accommodating chamber to an outside of the holder body, and the front end of the cutter clamping rod is used to clamp a cutter. The middle portion of the cutter clamping rod is loosely fitted in the rod accommodating chamber, and a flexible support is provided between the cutter clamping rod and the rod accommodating chamber so as to achieve flexibly supporting for the middle portion of the cutter clamping rod. The rear end of the cutter clamping rod is floatingly connected to the holding body, and the cutter clamping rod is translatable relative to the holding body along a direction perpendicular to its own axis line and is linearly rotatable relative to the holding body about its own axis line.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of machining and NC machine tools, and in particular to a full-floating high-precision cutter holder. [Background technology]

[0002] In the machine tool processing tool system, the cutting tool is divided into a shank system and a cutter. The shank system is the connection part with the machine tool, and during processing, the spindle of the machine tool drives the cutter through the shank system to process the workpiece.

[0003] When performing precise hole expansion and hole correction, the bottom hole formed is mainly processed using a hole expansion cutter, a forming cutter or a reamer. When using a shank system and a cutter with a rigid structure, there is a manufacturing error in the machine tool itself, that is, when the X-axis (horizontal) of the machine tool returns to the center line (zero) of the machine tool, it is impossible to return it to zero absolutely, and there is an error, and there is also an error in the installation of the cutter, there is an error in clamping the workpiece, and there is an accuracy error in the dial gauge for installation debugging. These bring about the problem that the axis of the cutter and the axis of the bottom hole to be finished are not concentric. In this case, if the hole is forcibly processed using a cutter, not only will it affect the life of the cutter, but the processing accuracy of the product will be poor, and the processed product may be discarded. Therefore, obtaining a high-precision concentricity of the bottom hole and the cutter axis is a prerequisite for achieving high-precision hole expansion and hole correction. In other words, it is required that the center axis of the cutter and the axis of the hole to be processed overlap perfectly, and it is necessary to ensure that they are not subjected to radial forces.

[0004] In particular, since reamers are mainly used for finishing small diameter and deep holes, the above problem becomes more prominent. Therefore, reamers often adopt floating reamer holders. However, conventional floating reamer holders have limited performance, and the cutter clamping rod can rotate around a straight line perpendicular to its own axis, but can only rotate along one direction and cannot translate along a direction perpendicular to its own axis. Therefore, the problem of concentricity deviation between the reamer and the bottom hole cannot be thoroughly solved. Summary of the Invention

[0005] In order to obtain a high degree of concentricity between the axis of the hole enlarging / hole repairing cutter and the bottom hole being machined, a full-floating high-precision cutter holder is provided according to the present invention.

[0006] The technical means of the present invention are as follows: a rod accommodating chamber is provided within the holder body, the middle and rear ends of the cutter clamping bar are provided within the rod accommodating chamber, the front end of the cutter clamping bar extends from the rod accommodating chamber to the outside of the holder body, the front end of the cutter clamping bar clamps a cutter, the middle section of the cutter clamping bar is clearance-fitted into the rod accommodating chamber, a flexible support is provided between the cutter clamping bar and the rod accommodating chamber so as to provide flexible support for the middle section of the cutter clamping bar, the rear end of the cutter clamping bar is floating-connected to the holder body, the cutter clamping bar is translatable relative to the holder body along a direction perpendicular to its own axis, and the cutter clamping bar is linearly rotatable relative to the holder body about its own axis.

[0007] Preferably, the axis of the cutter clamping bar is defined as the Y-axis, the vertical direction as the Z-axis, and the direction of the horizontal plane perpendicular to the Y-axis as the X-axis, and the cutter clamping bar is capable of translating along the X-axis and Z-axis, and the cutter clamping bar is capable of rotating around the X-axis and Z-axis.

[0008] Preferably, the flexible support is an annular elastic support or a compressed gas support.

[0009] Preferably, a seat accommodating chamber is provided within the holder body, the seat accommodating chamber is connected to the rod accommodating chamber, a connecting seat assembly is provided within the seat accommodating chamber, the rear end of the cutter clamping rod is floating connected to the holder body via the connecting seat assembly, the connecting seat assembly includes a rear seat, a front shaft and a rear shaft, the rear end of the cutter clamping rod and the rear seat are hingedly connected by the front shaft, the cutter clamping rod is linearly slidable along the axial direction of the front shaft, the rear seat and the holder body are hingedly connected by the rear shaft, the rear seat is linearly slidable along the axial direction of the rear shaft, and the front shaft and the rear shaft are arranged at an angle.

[0010] Preferably, the axis of the front axle is perpendicular to the axis of the rear axle.

[0011] Preferably, the connecting seat assembly further includes a front seat, a rear end of the cutter clamping bar is connected to the front seat, the front seat and the rear seat are hingedly connected by the front shaft, and the front seat is linearly slidable along the axial direction of the front shaft.

[0012] Preferably, the front axle and the rear axle are provided with a front axle sleeve and a rear axle sleeve, respectively, the front axle sleeve is fitted onto the front axle, the front seat is connected to the front axle sleeve, and the front axle sleeve is linearly slidable along the axial direction of the front axle, the rear axle sleeve is fitted onto the rear axle, the rear seat is connected to the rear axle sleeve, and the rear axle sleeve is linearly slidable along the axial direction of the rear axle, whereby the front axle and the front axle sleeve constitute rotating-linear sliding mating members, and the rear axle and the rear axle sleeve constitute rotating-linear sliding mating members.

[0013] Preferably, the connecting seat assembly further includes a connecting pipe, an adjusting front seat, at least two first fixed shafts, and at least two second fixed shafts, an end of the rear seat far from the cutter clamping rod is inserted into the connecting pipe, an end of the rear seat inserted into the connecting pipe is clearance-fitted to the connecting pipe, the rear shafts are rotatably connected to the connecting pipe, a portion of the adjusting front seat is inserted into the end of the connecting pipe far from the cutter clamping rod, each of the first fixed shafts passes through the adjusting front seat at an interval, and each of the second fixed shafts is a second fixed shaft. Fixed shafts pass through the adjustment front seat at intervals, the axes of the first fixed shafts are parallel to each other, the axes of the second fixed shafts are parallel to each other, the axis of the first fixed shaft is perpendicular to the axis of the second fixed shaft, each of the first fixed shafts is connected to the connecting pipe, each of the second fixed shafts is connected to the holder body, the first fixed shaft is linearly slidable relative to the adjustment front seat along its own axial direction, and the adjustment front seat is linearly slidable along the axial direction of the second fixed shaft.

[0014] Preferably, a partition plate is provided within the connecting pipe, and the partition plate divides the connecting pipe into a first chamber and a second chamber, with one end of the rear seat extending into the first chamber and a portion of the adjustment front seat extending into the second chamber.

[0015] Preferably, the full-floating high-precision cutter holder further includes an adjusting rear seat, the adjusting rear seat is connected to the holder body, a groove is formed on an end of the adjusting rear seat facing the adjusting front seat, an end of the adjusting front seat that does not enter the connecting tube enters into the groove, and the adjusting front seat is gap-fitted into the groove.

[0016] Preferably, an eccentric sleeve is attached to the rod accommodating chamber and is rotatable relative to the holder body, the middle section of the cutter clamping rod is clearance-fitted into the central hole of the eccentric sleeve, the axis of the central hole of the eccentric sleeve and the axis of the eccentric sleeve are arranged on different axes, the flexible support is arranged between the cutter clamping rod and the eccentric sleeve so as to provide flexible support for the middle section of the cutter clamping rod, and by rotating the eccentric sleeve, the cutter clamping rod translates along a direction perpendicular to its own axis.

[0017] Preferably, the eccentric sleeve is a gear sleeve, the eccentric sleeve including a sleeve portion and a gear portion provided on the outer periphery of the sleeve portion, the full-floating high-precision cutter holder further includes an adjustment gear, the adjustment gear meshes with the outer periphery of the gear portion, and by rotating the adjustment gear, the gear portion and the sleeve portion can rotate synchronously, and the cutter clamping bar can translate along a direction perpendicular to its own axis, and a locking structure for locking the adjustment gear and / or the gear portion is provided at at least one location of the adjustment gear and the gear portion.

[0018] Preferably, a dial gauge is attached to the holder body, an opening communicating with a rod accommodating chamber is formed at the top end of the holder body, the opening extends along the vertical direction, the eccentric sleeve is provided with an annular notch, the opening is aligned with the annular notch, a needle of the dial gauge passes through the opening and the annular notch in order to contact the outer peripheral wall of the cutter clamping rod, and the dial gauge measures the translation distance of the cutter clamping rod in the vertical direction.

[0019] Preferably, when the flexible support is support by compressed gas, annular gas grooves communicating with each other are formed on the inner and outer walls of the eccentric sleeve, and an air inlet and an air passage communicating with each other are provided in the holder body, the air inlet communicating with an external gas source, and the annular gas groove communicating with the air passage.

[0020] The present invention has the following beneficial effects: 1. The cutter clamping bar is fully floating and attached inside the holder, and can translate in a direction perpendicular to its own axis (two mutually perpendicular axes), and can rotate around a straight line perpendicular to its own axis (two mutually perpendicular axes). In addition, an elastic ring and air floating are provided at the mouth to pre-align it to the center. Therefore, the position and angle of the cutter clamping bar can be adjusted (having multiple degrees of freedom), and the cutter inside the cutter clamping bar can be automatically aligned to the bottom hole, and a high degree of concentricity is maintained between the two, and alignment is accurate during the hole expansion and hole correction processes, ensuring processing precision. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic cross-sectional view of a full-floating high-precision cutter holder according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a left side view of a full floating high precision cutter holder according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic KK cross-sectional view of an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic LL cross-sectional view of an embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic diagram of a holder body in the embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram of a cutter clamping bar in an embodiment of the present invention. [Figure 7] FIG. 2 is a schematic diagram of a connecting seat assembly according to an embodiment of the present invention. [Figure 8] FIG. 4 is a schematic diagram of an eccentric sleeve according to an embodiment of the present invention. [Figure 9] FIG. 4 is a left side view of the eccentric sleeve according to the embodiment of the present invention. [Figure 10] FIG. 4 is a schematic diagram of a floating cutter clamp bar in an embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view of a full-floating high-precision cutter holder according to another embodiment of the present invention. [Figure 12] FIG. 2 is a cross-sectional view of a connecting pipe in an embodiment of the present invention. [Figure 13] FIG. 2 is a front view of the adjustable seat according to the embodiment of the present invention. [Figure 14] FIG. 2 is a top view of the adjustable seat in the embodiment of the present invention. [Figure 15] FIG. 11 is a left side view of a full-floating high-precision cutter holder according to another embodiment of the present invention.

[0022] Explanation of symbols Holder body 1, rod accommodating chamber 101, air passage 102, intake port 103, seat accommodating chamber 104, opening 105, lock groove 106; cutter clamping rod 2, annular groove 201, O-ring 202, front end 203, middle section 204, rear end 205; connecting seat assembly 3, front seat 301, rear seat 302, front shaft 303, rear shaft 304, front shaft sleeve 305, rear shaft sleeve 306, connecting pipe 307, 3071 partition plate, first chamber 3072, second chamber 3073, front adjustment seat 308, first fixed shaft 309, rear adjustment seat 3010, groove 3011, second fixed shaft 3012; eccentric sleeve 4, sleeve portion 401, gear portion 402, arc groove 403, first lock screw 404, annular notch 405, annular gas groove 406; adjustment gear 5; dial gauge 6, lock clip 601, tightening screw 602; lock shaft 701, notch 7011, second lock screw 702. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present invention will be further described below with reference to the drawings, in which hole enlarging and hole repair using a reamer are taken as examples.

[0024] In the embodiment, as shown in FIG. 1 and FIG. 10, the full floating high-precision cutter holder includes a holder body 1 and a cutter clamping bar 2. The cutter clamping bar 2 includes a front end 203, a middle section 204, and a rear end 205, which are connected in order. A bar accommodating chamber 101 is provided in the holder body 1. The middle section 204 and the rear end 205 of the cutter clamping bar 2 are provided in the bar accommodating chamber 101, and the front end 203 of the cutter clamping bar 2 extends from the bar accommodating chamber 101 to the outside of the holder body 1. The front end 203 of the cutter clamping bar 2 is for clamping a cutter. The middle section 204 of the cutter clamping bar 2 is gap-fitted into the bar accommodating chamber 101. A flexible support is provided between the cutter clamping bar 2 and the bar accommodating chamber 101 so as to realize flexible support for the middle section 204 of the cutter clamping bar 2. A rear end 205 of the cutter clamp bar 2 is floatingly connected to the holder body 1. The cutter clamp bar 2 is translatable along any direction perpendicular to its own axis relative to the holder body 1, and is rotatable about any straight line perpendicular to its own axis relative to the holder body 1.

[0025] When machining a product, the cutter is clamped at the front end 203 of the cutter clamping bar 2, and the position of the entire full-floating high-precision cutter holder is adjusted to align the axis of the cutter with the axis of the bottom hole to be finished. If the axis of the cutter deviates slightly in the horizontal or vertical direction from the axis of the bottom hole to be finished, the cutter clamping bar 2 is moved up and down or translated left and right along a direction perpendicular to the axis of the cutter clamping bar 2 itself relative to the holder body 1. If there is an angular deviation between the axis of the cutter and the axis of the bottom hole to be finished, the cutter clamping bar 2 is rotated along a straight line perpendicular to the axis of the cutter clamping bar 2 itself relative to the holder body 1. This ensures reliable alignment of the axis of the cutter with the axis of the bottom hole to be finished.

[0026] 10, if the axis of the cutter clamp bar 2 is the Y axis, the vertical direction is the Z axis, and the horizontal plane perpendicular to the Y axis is the X axis, then the cutter clamp bar 2 can translate arbitrarily within the XOZ plane, and can rotate along any straight line within the XOZ plane. The floating method of the cutter clamp bar 2 can be resolved into two directions, the X axis and the Z axis, that is, it can translate along the X axis and the Z axis, and can also rotate around the X axis and the Z axis.

[0027] Flexible support in this embodiment can be understood as meaning that the cutter clamping bar 2 is in a floating state and does not come into rigid contact with the bar receiving chamber 101.

[0028] The rear end 205 of the cutter clamping bar 2 is connected in a floating manner to the main shaft of the machine tool via the holder body 1.

[0029] In the embodiment, in order to realize a full floating connection of the cutter clamping bar 2, as shown in Figs. 1, 5 to 7, a seat receiving chamber 104 is provided in the holder body 1, the seat receiving chamber 104 is connected to the bar receiving chamber 101, and a connecting seat assembly 3 is provided in the seat receiving chamber 104, and the rear end 205 of the cutter clamping bar 2 is floatingly connected to the holder body 1 via the connecting seat assembly 3. The connecting seat assembly 3 includes a rear seat 302, a front shaft 303, and a rear shaft 304. The rear end 205 of the cutter clamping bar 2 and the rear seat 302 are hingedly connected via the front shaft 303. The cutter clamping bar 2 can be linearly slidable by the axial direction of the front shaft 303. The rear seat 302 and the holder body 1 are hingedly connected via the rear shaft 304. The rear seat 302 can be linearly slidable along the axial direction of the rear shaft 304. The front shaft 303 and the rear shaft 304 are disposed at an angle. Specifically, the rear seat 302 is capable of linearly sliding along the axial direction of the rear shaft 304, and the front shaft 303 and the rear shaft 304 are disposed at an angle, so that the cutter clamping bar 2, the rear seat 302, and the front shaft 303 as a whole are capable of linearly sliding along the axial direction of the rear shaft 304. In this embodiment, the axis of the front shaft 303 and the axis of the rear shaft 304 are perpendicular to each other, forming a cross connection.

[0030] 1, and 5 to 7, the connecting seat assembly 3 further includes a front seat 301. The rear end 205 of the cutter clamping bar 2 is connected to the front seat 301. The front seat 301 and the rear seat 302 are hingedly connected via a front shaft 303. The front seat 301 is linearly slidable along the axial direction of the front shaft 303.

[0031] In such a structure, by installing the connecting seat assembly 3, the cutter clamp bar 2 can slide linearly together with the front seat 301 along the axial direction of the front shaft 303, the cutter clamp bar 2, the rear seat 302 and the front shaft 303 can slide linearly as a whole along the axial direction of the rear shaft 304, the cutter clamp bar 2 can rotate about the axis of the front shaft 303, and the cutter clamp bar 2 can rotate about the axis of the rear shaft 304. This allows the cutter clamp bar 2 to float in a direction parallel to the axial direction, and to rotate and float in a vertical space.

[0032] In the embodiment, as shown in FIG. 7, the front shaft 303 and the rear shaft 304 are provided with a front shaft sleeve 305 and a rear shaft sleeve 306, respectively. The front shaft sleeve 305 is fitted onto the front shaft 303, the front seat 301 is connected to the front shaft sleeve 305, and the front shaft sleeve 305 can linearly slide along the axial direction of the front shaft 303. The rear shaft sleeve 306 is fitted onto the rear shaft 304, the rear seat 302 is connected to the rear shaft sleeve 306, and the rear shaft sleeve 306 can linearly slide along the axial direction of the rear shaft 304. Thus, the front shaft 303 and the front shaft sleeve 305 constitute a rotating-linear sliding mating member, and the rear shaft 304 and the rear shaft sleeve 306 constitute a rotating-linear sliding mating member. The installation of the rotating-linear sliding mating member ensures the floating motion accuracy of the cutter clamping bar 2. In an embodiment in which the connecting seat assembly 3 does not include the front seat 301 , the cutter clamping bar 2 is directly connected to the front shaft sleeve 305 .

[0033] In the embodiment, as shown in Figs. 1, 5 and 6, based on the full floating connection of the cutter clamp bar 2, the middle section 204 of the cutter clamp bar 2 can realize floating by flexible support. There are two types of flexible support in this embodiment. One is an annular elastic support provided between the cutter clamp bar 2 and the rod accommodating chamber 101. Specifically, an annular groove 201 is provided at both ends of the middle section 204 of the cutter clamp bar 2, and an O-ring 202 is attached in the annular groove 201 as an annular elastic support. The other is support by compressed gas. Specifically, this is realized by introducing compressed gas (high-speed airflow) between the cutter clamp bar 2 and the rod accommodating chamber 101. Here, the O-ring is suitable for a relatively hard workpiece, and the compressed gas is suitable for a soft workpiece or a workpiece requiring high precision.

[0034] As shown in FIG. 11 and FIG. 13-14, the connecting seat assembly 3 further includes a connecting pipe 307, an adjusting front seat 308, at least two first fixed shafts 309, and at least two second fixed shafts 3012. An end of the rear seat 302 remote from the cutter clamping bar 2 enters the connecting pipe 307. An end of the rear seat 302 entering the connecting pipe 307 is clearance-fitted into the connecting pipe 307. The rear shaft 304 is rotatably connected to the connecting pipe 307. A portion of the adjusting front seat 308 enters the end of the connecting pipe 307 remote from the cutter clamping bar 2. Each of the first fixed shafts 309 passes through the adjusting front seat 308 at an interval, and each of the second fixed shafts 3012 passes through the adjusting front seat 308 at an interval. The axes of the first fixed shafts 309 are parallel to each other, and the axes of the second fixed shafts 3012 are parallel to each other. The axis of the first fixed shaft 309 is perpendicular to the axis of the second fixed shaft 3012. Each of the first fixed shafts 309 is connected to the connecting pipe 307, and each of the second fixed shafts 3012 is connected to the holder body 1. The first fixed shaft 309 is linearly slidable relative to the adjustment front seat 308 along its own axial direction. The adjustment front seat 308 is linearly slidable along the axial direction of the second fixed shaft 3012. Specifically, when adjusting the center height of the cutter clamping bar 2, the cutter clamping bar 2, the front seat 301, the rear seat 302, the front shaft 303, the rear shaft 304, the front shaft sleeve 305, the rear shaft sleeve 306, the connecting pipe 307, the first fixed shaft 309 and the adjustment front seat 308 move up and down together along the axial direction of the second fixed shaft 3012. In this embodiment, the cutter clamp bar 2 , the rear seat 302 , the front shaft 303 , the rear shaft 304 , the connecting pipe 307 and the first fixed shaft 309 are all capable of translation along the axial direction of the first fixed shaft 309 .

[0035] 11 and 12, a partition plate 3071 is provided inside the connecting pipe 307. The partition plate 3071 divides the connecting pipe 307 into a first chamber 3072 and a second chamber 3073. One end of the rear seat 302 enters the first chamber 3072, and a portion of the front adjusting seat 308 enters the second chamber 3073. In this embodiment, the front adjusting seat 308 is gap-fitted into the second chamber 3073. Specifically, a gap exists between the front adjusting seat 308 and the partition plate 3071, and a gap exists between the front adjusting seat 308 and the inner wall of the connecting pipe 307.

[0036] Specifically, each of the first fixed shafts 309 passes through a portion that enters the second chamber 3073 of the front adjusting seat 308. Each of the second fixed shafts 3012 passes through a portion that does not enter the second chamber 3073 of the front adjusting seat 308.

[0037] 11 , the full floating high precision cutter holder further includes an adjusting rear seat 3010. The adjusting rear seat 3010 is connected to the holder body 1, and the second fixed shaft 3012 is connected to the adjusting rear seat 3010, so that the second fixed shaft 3012 is connected to the holder body 1 via the adjusting rear seat 3010. Specifically, if the second fixed shaft 3012 is connected perpendicularly to the holder body 1, it is difficult to process or attach the second fixed shaft 3012 and the holder body 1.

[0038] A groove 3011 is formed on the end of the rear adjusting seat 3010 facing the front adjusting seat 308. The end of the front adjusting seat 308 that does not enter the connecting pipe 307 enters into the groove 3011. The front adjusting seat 308 is fitted into the groove 3011 with a clearance.

[0039] The connecting seat assembly 3 includes two embodiments. As shown in Fig. 1 and Fig. 7, in embodiment 1, the connecting seat assembly 3 includes a front seat 301, a rear seat 302, a front shaft 303, a rear shaft 304, a front shaft sleeve 305, and a rear shaft sleeve 306. In this case, the rear shaft 304 is directly connected to the holder body 1. Specifically, in embodiment 1, after the cutter clamping bar 2 and the front seat 301 move together in the axial direction of the front shaft 303, the horizontal axis of the cutter clamping bar 2 and the front seat 301 is not coaxial with the horizontal axis of the rear seat 302. Therefore, when the workpiece is machined, the workpiece exerts a reaction force on the cutter, which acts on the front shaft 303 through the cutter clamping bar 2 and the front seat 301. Since this reaction force deviates from the horizontal axis of the rear seat 302, the rear seat 302 rotates at a small angle around the rear shaft 304, and the cutter clamping bar 2 and the front seat 301 rotate in the opposite direction at a small angle, and as a result, the cutter rotates at a small angle, and the concentricity of the cutter and the machined workpiece is reduced to a certain extent. As shown in Figures 1, 7 and 11, in the second embodiment, the connecting seat assembly 3 includes, in addition to the front seat 301, the rear seat 302, the front shaft 303, the rear shaft 304, the front shaft sleeve 305 and the rear shaft sleeve 306, a connecting pipe 307, an adjusting front seat 308, at least two first fixed shafts 309, an adjusting rear seat 3010 and at least two second fixed shafts 3012. Specifically, in the second embodiment, when the center height of the clamping bar 2 is to be significantly adjusted, the center heights of the cutter clamping bar 2, the front seat 301, the rear seat 302, the front shaft 303, the rear shaft 304 and the connecting pipe 307 are adjusted and changed by adjusting the rotating adjusting gear 5 to rotate the eccentric sleeve 4. After the center heights of the above parts are changed, the connecting pipe 307 displaces the adjusting front seat 308 along the first fixed shaft 309 or the second fixed shaft 3012 relative to the center of the clamping bar 2. At least two first fixed shafts 309 and at least two second fixed shafts 3012 are attached to both ends of the adjusting front seat 308, and the first fixed shafts 309 and the second fixed shafts 3012 are cross-shaped, so that the adjusting front seat 308 can adjust the corresponding center only by moving up and down. In addition, when the adjusting front seat 308 receives a rearward force from the workpiece, the adjusting front seat 308 cannot rotate around the first fixed shafts 309 or the second fixed shafts 3012, so the connecting pipe 307, the clamping rod 2, etc. cannot rotate, and it is guaranteed that the cutter and the workpiece always have reliable concentricity.

[0040] In the embodiment, in order to solve the problem of adjusting the center height of the cutter clamping bar 2, as shown in Figs. 1-5, 8-9, the rod accommodating chamber 101 is fitted with an eccentric sleeve 4 that is rotatable with respect to the holder body 1. The middle section 204 of the cutter clamping bar 2 is clearance-fitted into the central hole of the eccentric sleeve 4, and the axis of the central hole of the eccentric sleeve 4 and the axis of the eccentric sleeve 4 are provided on different axes, and flexible support is provided between the cutter clamping bar 2 and the eccentric sleeve 4, thereby realizing flexible support for the middle section 204 of the cutter clamping bar 2. By rotating the eccentric sleeve 4, the cutter clamping bar 2 translates along a direction perpendicular to its own axis. Specifically, the axis of the central hole of the eccentric sleeve 4 and the axis of the eccentric sleeve 4 are provided on different axes. That is, the wall thickness of the eccentric sleeve 4 is different at different circumferential positions. When the eccentric sleeve 4 is rotated, the wall thickness at the bottom and top of the cutter clamp bar 2 where it contacts the eccentric sleeve 4 changes, thereby changing the vertical height of the cutter clamp bar 2. Therefore, the rotating eccentric sleeve 4 makes it easy to adjust the center height of the cutter clamp bar 2. In the first embodiment of the connecting seat assembly 3, the middle section 204 of the cutter clamp bar 2 is provided within the eccentric sleeve 4, so that the vertical height of the cutter clamp bar 2 can be changed by rotating the eccentric sleeve 4. In embodiment 2 of the connecting seat assembly 3, the middle section 204 and rear end 205 of the cutter clamping bar 2, the front seat 301, the rear seat 302, the front shaft 303, the rear shaft 304, the front shaft sleeve 305, the rear shaft sleeve 306, and the connecting pipe 307 are all arranged within the eccentric sleeve 4, so that by rotating the eccentric sleeve 4, the vertical heights of the cutter clamping bar 2, the front seat 301, the rear seat 302, the front shaft 303, the rear shaft 304, the front shaft sleeve 305, the rear shaft sleeve 306, and the connecting pipe 307 can be changed together. In the present invention, when using an NC lathe, the cutter clamping bar 2 realizes the adjustment of the center height by the eccentric sleeve 4, and overcomes the errors caused by the manufacturing and installation of the full-floating high-precision cutter holder. This reduces the requirements for the machining accuracy of the full-floating high-precision cutter holder, and reduces the cost. In another embodiment, when the machining and installation accuracy of the full-floating high-precision cutter holder is relatively high, the cutter in the cutter clamping bar can be accurately aligned with the workpiece, so there is no need to adjust the center height of the cutter clamping bar 2, and therefore the eccentric sleeve 4 is not required.

[0041] The eccentric sleeve 4 can realize rotation by screw connection, gear transmission, etc. In this embodiment, gear transmission is used. In the embodiment, as shown in Figs. 3-4, 8-9, the eccentric sleeve 4 is a gear sleeve. The eccentric sleeve 4 includes a sleeve portion 401 and a gear portion 402 provided on the outer periphery of the sleeve portion 401. The full floating high precision cutter holder further includes an adjustment gear 5. The adjustment gear 5 meshes with the outer periphery of the gear portion 402. By rotating the adjustment gear 5, the gear portion 402 and the sleeve portion 401 can be rotated synchronously, so that the cutter clamping rod 2 can translate along a direction perpendicular to its own axis. The end of the adjustment gear 5 has a hexagonal hole, which is convenient for operation using a wrench. In addition, the diameter of the adjustment gear 5 is smaller than that of the gear portion 402, so that it is suitable for fine adjustment.

[0042] At least one portion of the adjustment gear 5 and the gear portion 402 is provided with a locking structure for locking the adjustment gear 5 and / or the gear portion 402. Specifically, after the position of the cutter clamp bar 2 is adjusted, the adjustment gear 5 and / or the gear portion 402 are locked by the locking structure, thereby locking the eccentric sleeve 4 and preventing it from rotating. This prevents the eccentric sleeve 4 from rotating due to the action of the workpiece to be machined or other circumstances, causing the position of the cutter clamp bar 2 to change and deviate from the adjusted position.

[0043] 2 and 9, in the connecting seat assembly 3 of embodiment 1, a concentric arc groove 403 is provided on the end face perpendicular to the axis of the eccentric sleeve 4, and a first lock screw 404 is attached. After the first lock screw 404 passes through the arc groove 403, it screws into a screw hole on the holder body 1, and the arc groove 403 and the first lock screw 404 form a locking structure. After the center height of the cutter clamping bar 2 is adjusted to a desired position, the eccentric sleeve 4 is locked by the first lock screw 404, thereby preventing the position of the cutter clamping bar 2 from changing due to the rotation of the eccentric sleeve 4.

[0044] As shown in FIG. 15, in the connecting seat assembly 3 of the second embodiment, the holder body 1 is formed with a lock groove 106. The axis of the lock groove 106 is perpendicular to the axis of the rod-accommodating chamber 101. The full-floating high-precision cutter holder further includes a lock shaft 701. The lock shaft 701 is provided in the lock groove 106. The length of the lock shaft 701 is smaller than the length of the lock groove 106. There is a notch 7011 on the side wall of the lock shaft 701, and the shape of the notch 7011 overlaps with the outer periphery of the rod-accommodating chamber 101, so that the area of ​​the lock shaft 701 corresponding to the notch 7011 contacts the eccentric sleeve 4. The full-floating high-precision cutter holder further includes a second lock screw 702. The second lock screw 702 passes through the holder body 1 and enters the lock shaft 701. The second lock screw 702 is screwed into the lock shaft 701, and by rotating the second lock screw 702, the lock shaft 701 moves along the axis of the second lock screw 702, and the notch of the lock shaft 701 presses against the outer circumferential wall of the eccentric sleeve 4 to lock the eccentric sleeve 4. The lock shaft 701 and the second lock screw 702 constitute a locking structure. Specifically, the axis of the lock groove 106 is perpendicular to the axis of the rod-accommodating chamber 101, and the axis of the lock shaft 701 is perpendicular to the axis of the eccentric sleeve 4. Therefore, when the second lock screw 702 is rotated, the lock shaft 701 cannot rotate due to the obstruction of the eccentric sleeve 4, and the lock shaft 701 can only move along the axis of the second lock screw 702.

[0045] In the embodiment, as shown in Figs. 1 to 3, 5 and 7, in the connecting seat assembly 3 of the embodiment 1, a dial gauge 6 is attached to the holder body 1. An opening 105 communicating with the rod accommodating chamber 101 is formed at the top end of the holder body 1. The opening 105 extends along the vertical direction. An annular notch 405 is formed in the eccentric sleeve 4. The opening 105 is aligned with the annular notch 405. The needle of the dial gauge 6 passes through the opening 105 and the annular notch 405 in order to contact the outer peripheral wall of the cutter clamping bar 2. The dial gauge 6 measures the translation distance of the cutter clamping bar 2 in the vertical direction. The dial gauge 6 indicates the position of the center height of the cutter clamping bar 2, which is convenient for the operator to operate. In the connecting seat assembly 3 of the embodiment 2, the needle of the dial gauge 6 passes through the opening 105 and the annular notch 405 in order to contact the outer peripheral wall of the connecting pipe 307. The dial gauge 6 measures the translation distance in the vertical direction of the connecting pipe 307. The connecting pipe 307, the rod accommodating chamber 101, the eccentric sleeve 4, and the cutter clamping rod 2 have central axes that overlap with each other, and therefore when the connecting pipe 307 is aligned in the vertical direction, the cutter clamping rod 2 is aligned with the workpiece.

[0046] The dial gauge 6 is attached and fixed to the holder body 1 by a lock clip 601 and a fastening screw 602. This structure makes it easy to attach and remove the dial gauge 6. Specifically, the lock clip 601 is located on the dial gauge 6, and the fastening screw 602 passes through the holder body 1 and the lock clip 601 in order to fix the dial gauge 6 to the holder body 1.

[0047] In the embodiment, as shown in Figs. 1, 3 and 5, when the flexible support is supported by compressed gas, the inner wall and the outer wall of the eccentric sleeve 4 are provided with annular gas grooves 406 communicating with each other. The holder body 1 is formed with an air inlet 103 and an air passage 102 communicating with each other. The air inlet 103 communicates with an external gas source, and the annular gas groove 406 communicates with the air passage 102. This structure is a specific air floating method of the cutter clamping bar 2, and the cutter clamping bar 2 can be supported by compressed gas at any position in the circumferential direction by the annular gas groove 406, thereby realizing floating. The eccentric sleeve 4 is provided with at least two annular gas grooves 406 in the axial direction. This better ensures the floating support effect.

[0048] The operating procedure of this embodiment is as follows. After the reamer holder is attached to the NC lathe pallet, first, the parallelism of the reamer holder in both the X-axis normal plane and the Y-axis normal plane is corrected, then the Z-axis position (center height) of the cutter clamping bar 2 is corrected by the adjustment gear 5, and finally, the X-axis position of the cutter clamping bar 2 is corrected by the NC program, thereby completing the centering of the reamer and the lathe spindle. During the correction, the cutter clamping bar 2 is passed through the intake port 103 and kept in a floating state. In addition, due to the elasticity of the dial gauge 6 needle, the cutter clamping bar 2 needs to leave an appropriate backlash compensation amount in the direction of the dial gauge 6 needle, or the compressed air pressure needs to be increased to overcome the elasticity of the dial gauge 6 needle.

[0049] After the correction, the hole can be expanded and corrected. When the connecting seat assembly 3 corresponds to the embodiment 1, the dial gauge 6 contacts the outer peripheral wall of the cutter clamping bar 2, so that the dial gauge 6 needs to be removed before processing. When the connecting seat assembly 3 corresponds to the embodiment 2, the dial gauge 6 contacts the outer peripheral wall of the connecting pipe 307, and the dial gauge 6 does not contact the cutter clamping bar 2 and does not affect the cutter clamping bar 2, so that the dial gauge 6 does not need to be removed before processing. When processing, the air intake 103 is kept in a ventilated state. The middle section 204 of the cutter clamping bar 2 is subjected to the air pressure of the outer peripheral wall, so that the first accurate alignment is guaranteed in each reaming. The rear end 205 of the cutter clamping bar 2 is connected to the connecting seat assembly 3, so that the rigidity required for machining is ensured and timely multi-degree-of-freedom correction is possible. This provides a high-precision concentricity between the axis of the reamer and the bottom hole to be machined. Furthermore, the size of the reamed finish can be controlled to 0.002 mm.

[0050] This embodiment is a reamer holder. This structure can also be applied to similar cutters such as hole expanding cutters and boring cutters.

[0051] The above examples of the present invention are only for illustrating the present invention, and do not limit the embodiments of the present invention. Any obvious changes or modifications obtained based on the essential idea of ​​the present invention still fall within the protection scope of the present invention.

Claims

1. The present invention includes a holder body (1) and a cutter clamping bar (2), the cutter clamping bar (2) including a front end (203), a middle section (204), and a rear end (205) which are connected in this order, a rod accommodating chamber (101) is provided within the holder body (1), the middle section (204) and the rear end (205) of the cutter clamping bar (2) are provided within the rod accommodating chamber (101), the front end (203) of the cutter clamping bar (2) extends from the rod accommodating chamber (101) to the outside of the holder body (1), the front end (203) of the cutter clamping bar (2) clamps a cutter, and the cutter clamping bar (2) is provided with a rod accommodating chamber (101) and a rod accommodating chamber (101) for accommodating a cutter. a middle section (204) of the cutter clamping bar (2) is clearance-fitted into the rod receiving chamber (101), a flexible support is provided between the cutter clamping bar (2) and the rod receiving chamber (101) so as to provide a flexible support for the middle section (204) of the cutter clamping bar (2), a rear end (205) of the cutter clamping bar (2) is floating-connected to the holder body (1), the cutter clamping bar (2) is translatable along a direction perpendicular to its own axis relative to the holder body (1), and the cutter clamping bar (2) is rotatable around its own axis relative to the holder body (1); A seat receiving chamber (104) is provided in the holder body (1), and the seat receiving chamber (104) is connected to the rod receiving chamber (101). A connecting seat assembly (3) is provided in the seat receiving chamber (104). The rear end (205) of the cutter clamping rod (2) is connected to the holder body (1) in a floating manner via the connecting seat assembly (3). The connecting seat assembly (3) includes a rear seat (302), a front shaft (303), and a rear shaft (304). a full floating high precision cutter holder, characterized in that the end (205) and the rear seat (302) are hingedly connected by the front shaft (303), the cutter clamping bar (2) is capable of linearly sliding along the axial direction of the front shaft (303), the rear seat (302) and the holder body (1) are hingedly connected by the rear shaft (304), the rear seat (302) is capable of linearly sliding along the axial direction of the rear shaft (304), and the front shaft (303) and the rear shaft (304) are arranged at an angle.

2. 2. The full-floating high-precision cutter holder as described in claim 1, characterized in that the axis of the cutter clamping bar (2) is defined as the Y-axis, the vertical direction as the Z-axis, and the direction of the horizontal plane perpendicular to the Y-axis as the X-axis, the cutter clamping bar (2) is translatable along the X-axis and Z-axis, and the cutter clamping bar (2) is rotatable around the X-axis and Z-axis.

3. The full-floating high-precision cutter holder according to claim 1 or 2, characterized in that the flexible support is a ring-shaped elastic support or a support by compressed gas.

4. The full-floating high-precision cutter holder according to claim 1, characterized in that the axis of the front shaft (303) is perpendicular to the axis of the rear shaft (304).

5. The full-floating high-precision cutter holder of claim 1, characterized in that the connecting seat assembly (3) further includes a front seat (301), a rear end (205) of the cutter clamping bar (2) is connected to the front seat (301), the front seat (301) and the rear seat (302) are hingedly connected by the front shaft (303), and the front seat (301) is linearly slidable along the axial direction of the front shaft (303).

6. The front shaft (303) and the rear shaft (304) are provided with a front shaft sleeve (305) and a rear shaft sleeve (306), respectively, the front shaft sleeve (305) is fitted onto the front shaft (303), the front seat (301) is connected to the front shaft sleeve (305), the front shaft sleeve (305) is linearly slidable along the axial direction of the front shaft (303), the rear shaft sleeve (306) is fitted onto the rear shaft (304), and the rear seat (301) is connected to the front shaft sleeve (305). The full-floating high-precision cutter holder of claim 5, characterized in that the seat (302) is connected to the rear shaft sleeve (306), and the rear shaft sleeve (306) is capable of linearly sliding along the axial direction of the rear shaft (304), whereby the front shaft (303) and the front shaft sleeve (305) constitute a rotation-linear sliding mating member, and the rear shaft (304) and the rear shaft sleeve (306) constitute a rotation-linear sliding mating member.

7. The connecting seat assembly (3) further includes a connecting pipe (307), an adjusting front seat (308), at least two first fixed shafts (309), and at least two second fixed shafts (3012), an end of the rear seat (302) remote from the cutter clamping bar (2) enters into the connecting pipe (307), the end of the rear seat (302) entering into the connecting pipe (307) is fitted into the connecting pipe (307) with a clearance, the rear shaft (304) is rotatably connected to the connecting pipe (307), a portion of the adjusting front seat (308) enters into the end of the connecting pipe (307) remote from the cutter clamping bar (2), each of the first fixed shafts (309) passes through the adjusting front seat (308) at an interval, and each of the second fixed shafts (3012) is spaced apart from the connecting pipe (307).

2. The full-floating high-precision cutter holder according to claim 1, characterized in that the first fixed shafts (309) pass through the adjusting front seat (308) along an axial direction of the first fixed shaft (309), axes of the first fixed shafts (309) are parallel to each other, axes of the second fixed shafts (3012) are parallel to each other, the axis of the first fixed shafts (309) is perpendicular to the axis of the second fixed shafts (3012), each of the first fixed shafts (309) is connected to the connecting pipe (307), each of the second fixed shafts (3012) is connected to the holder body (1), the first fixed shafts (309) are linearly slidable relative to the adjusting front seat (308) along their own axial direction, and the adjusting front seat (308) is linearly slidable along the axial direction of the second fixed shaft (3012).

8. The full-floating high-precision cutter holder of claim 7, characterized in that a partition plate (3071) is provided within the connecting pipe (307), and the partition plate (3071) divides the connecting pipe (307) into a first chamber (3072) and a second chamber (3073), one end of the rear seat (302) extends into the first chamber (3072), and a portion of the adjusting front seat (308) extends into the second chamber (3073).

9. The full-floating high-precision cutter holder of claim 7, further comprising an adjusting rear seat (3010), the adjusting rear seat (3010) being connected to the holder body (1), a groove (3011) being formed at an end of the adjusting rear seat (3010) facing the adjusting front seat (308), an end of the adjusting front seat (308) not inserted into the connecting tube (307) being inserted into the groove (3011), and the adjusting front seat (308) being fitted into the groove (3011) with a clearance.

10. 4. The full-floating high-precision cutter holder according to claim 3, characterized in that an eccentric sleeve (4) rotatable relative to the holder body (1) is attached to the rod accommodating chamber (101), the middle section (204) of the cutter clamping bar (2) is clearance-fitted into the central hole of the eccentric sleeve (4), the axis of the central hole of the eccentric sleeve (4) and the axis of the eccentric sleeve (4) are arranged on different axes, the flexible support is arranged between the cutter clamping bar (2) and the eccentric sleeve (4) so ​​as to realize flexible support for the middle section (204) of the cutter clamping bar (2), and by rotating the eccentric sleeve (4), the cutter clamping bar (2) translates along a direction perpendicular to its own axis.

11. 11. The full-floating high-precision cutter holder according to claim 10, characterized in that: the eccentric sleeve (4) is a gear sleeve, the eccentric sleeve (4) includes a sleeve portion (401) and a gear portion (402) provided on the outer periphery of the sleeve portion (401); the full-floating high-precision cutter holder further includes an adjustment gear (5), the adjustment gear (5) meshes with the outer periphery of the gear portion (402); by rotating the adjustment gear (5), the gear portion (402) and the sleeve portion (401) can rotate synchronously; the cutter clamping bar (2) can translate along a direction perpendicular to its own axis; and a locking structure for locking the adjustment gear (5) and / or the gear portion (402) is provided at at least one location of the adjustment gear (5) and the gear portion (402).

12. 11. The full-floating high-precision cutter holder according to claim 10, characterized in that: a dial gauge (6) is attached to the holder body (1); an opening (105) communicating with the rod accommodating chamber (101) is formed at the top end of the holder body (1); the opening (105) extends along a vertical direction; the eccentric sleeve (4) is provided with an annular notch (405), the opening (105) is aligned with the annular notch (405); a needle of the dial gauge (6) passes through the opening (105) and the annular notch (405) in order to contact the outer peripheral wall of the cutter clamping bar (2); and the dial gauge (6) measures the translation distance of the cutter clamping bar (2) in the vertical direction.

13. The full-floating high-precision cutter holder of claim 10, characterized in that, when the flexible support is support by compressed gas, the inner wall and the outer wall of the eccentric sleeve (4) are formed with an annular gas groove (406) communicating with each other, the holder body (1) is provided with an intake port (103) and an air passage (102) communicating with each other, the intake port (103) is connected to an external gas source, and the annular gas groove (406) is connected to the air passage (102).

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