TWI655984B - Tool bar for reducing component combination tolerance - Google Patents

Abstract

A shank for reducing assembly tolerance of a component, comprising a shank body, a collet and a fixing nut, the shank body comprising a first locking portion, comprising an external thread, a first abutting surface, a first a second abutting surface, at least one groove, and at least one sealing member, wherein the at least one groove is recessed in the second abutting surface, and the at least one sealing member is disposed in the at least one groove to slightly protrude the second abutting surface The fixing nut includes a second locking portion including an internal thread, a third abutting surface and a fourth abutting surface, wherein the internal thread and the external thread are matching trapezoidal threads, and the third abutting The surface is matched with the diameter of the first abutting surface, and the diameter of the third abutting surface and the first abutting surface is less than 0.015 mm, and the fourth abutting surface is in interference fit with the at least one sealing member.

Description

Tool bar for reducing component combination tolerance

The invention relates to a clamping shank of a processing machine, in particular to a shank, which can reduce the combined tolerance of the shank to reduce the vibration when the shank rotates, and can improve the processing precision of the processing machine.

For the existing arbor, please refer to FIG. 9 and FIG. 10, which includes a shank body 91, a collet 92 and a fixing nut 93. The collet 92 is used for clamping the processing tool 80 and is mounted on The holder body 91 is locked and fixed by the fixing nut 93.

The connection between the existing shank body 91 and the fixing nut 93 is only screwed and locked by the matching outer trapezoidal thread 911 and the inner trapezoidal thread 931. However, due to the processing precision of the thread, the thread pitch diameter PD is 39.25 gong. For example, when the outer trapezoidal thread 911 and the inner trapezoidal thread 931 have a pitch P of 1.5 mm, when the machining tolerance level of the inner trapezoidal thread 931 is 7H, the maximum limit size of the pitch diameter PD of the inner trapezoidal thread 931 is 39.424 mm. When the tolerance level of the outer trapezoidal thread 911 is 7e, the minimum limit size of the pitch diameter PD of the outer trapezoidal thread 911 is 39.183 mm, and the machining tolerance value of the pitch P is 0.17 mm, so the outer trapezoidal thread 911 When the inner trapezoidal thread 931 is connected, the maximum gap at the pitch diameter PD reaches 0.461 mm, which affects the screw joint strength of the cutter body 91 and the fixed nut 93 and the center-of-gravity yaw when connecting, and the cutter bar is high speed. When the rotation is easy to generate vibration, the balance of the shank is poor and the machining accuracy is lowered. Therefore, the structural design of the existing arbor is still improved.

The main object of the present invention is to provide a shank which reduces the vibration of the arbor during high-speed rotation and improves the machining accuracy of the arbor by reducing the assembly tolerance between the shank body and the fixed nut.

In order to achieve the above object, the present invention provides a tool bar for reducing the tolerance of component assembly, comprising a tool bar body including a front end; a rear end; a tapered groove recessed in the front end of the tool bar body; a locking portion is disposed on an outer circumference of the shank body at a front end of the shank body, and includes an external thread, which is an external trapezoidal thread, and includes an outer diameter and a diameter; a first abutting surface Adjacent to a side of the external thread away from the front end, an outer diameter of the first abutting surface is larger than an outer diameter of the outer thread; a second abutting surface adjacent to a side of the outer thread close to the front end, the The outer diameter of the second abutting surface is smaller than the outer diameter of the outer thread; at least one groove is recessed in the second abutting surface; and at least one sealing member is disposed in the at least one groove, and the at least one The sealing member slightly protrudes from the second abutting surface in a natural state; a collet is installed in the tapered groove of the shank body; and a fixing nut is screwed to the front end of the shank body, A second locking portion is included, and the ring is disposed inside the fixing nut a threaded connection with the first locking portion of the shank body, which includes an internal thread, which is an inner trapezoidal thread matching the external thread of the shank body; a third abutting surface adjacent to the inner portion Threading the position of the first abutting surface of the shank body, the diameter of the third abutting surface is matched with the diameter of the first abutting surface of the shank body, and the third abutting surface and the first abutting surface a diameter matching gap of less than 0.015 mm; and a fourth abutting surface adjacent to the internal thread and corresponding to the position of the at least one sealing member of the shank body, the diameter of the fourth abutting surface and the shank of the shank body The diameters of the two abutting surfaces are matched, and the fourth abutting surface is in interference fit with the at least one sealing member.

According to the above technical feature, when the cutter body of the reduction assembly tolerance of the present invention and the fixed nut are connected by the external thread of the first locking portion and the internal thread of the second locking portion, the first abutting surface and the first The matching gap of the diameter of the three abutting faces is less than 0.015 mm, and the eccentricity of the fixing nut and the connecting rod body is restricted, and the sealing member of the second abutting surface provided on the shank body is used The interference fit between the fourth abutting faces of the fixing nut eliminates the radial gap between the shank body and the fixed nut, and eliminates the thread matching clearance caused by the limitation of the threading precision, so that the shank body The connection of the fixed nut is more stable, the eccentricity during the connection is reduced, and the dynamic balance of the cutter bar of the present invention at high speed rotation is improved, the yaw and vibration during the rotation of the cutter bar are reduced, and the knife using the invention is improved. Machining accuracy when machining a workpiece with a rod.

Referring to FIG. 1 to FIG. 4, a first preferred embodiment of the tool bar for reducing assembly tolerance of the present invention includes a tool bar body 10, a collet 20 and a fixing nut 30, wherein:

The shank body 10 includes a front end 101, a rear end 102, a tapered slot 11 and a first locking portion 13. The tapered slot 11 is recessed in the front end 101 of the shank body 10, the first solid The locking portion 13 is disposed on the outer periphery of the shank body 10 and is located at the front end 101 of the shank body 10. The first locking portion 13 includes an external thread 131, a first abutting surface 132, and a second abutting surface 133. At least one groove 134 and at least one sealing member 135; the external thread 131 is an outer trapezoidal thread having an outer diameter D1 and a diameter D2; the first abutting surface 132 and the second abutting surface 133 are adjacent to the The opposite sides of the external thread 131, wherein the first abutting surface 132 is defined on a side away from the front end 101, and the second abutting surface 133 is defined on a side close to the front end 101, and the outer diameter of the first abutting surface 132 The size is slightly larger than the outer diameter D1 of the outer thread 131; the outer diameter of the second abutting surface 133 is slightly smaller than the diameter D2 of the outer thread 131; the at least one groove 134 is recessed in the second abutting surface 133 The at least one sealing member 135 is disposed in the at least one groove 134, and the at least one sealing member 135 protrudes slightly from the second abutting surface 133 in a natural state.

In the first embodiment, the first locking portion 13 is provided with a plurality of grooves 134 and a plurality of sealing members 135, and the number of the grooves 134 is not less than the number of the sealing members 135, and the grooves 134 are looped. Forming an opening on the second abutting surface of the shank body, and forming an opening in the second abutting surface, and each of the concave grooves 134 extends along the axial direction of the shank body 10, and at the front end The openings 135 are respectively disposed in one of the grooves 134, and each of the sealing members 135 is a cylindrical elastic body, and the opening of each of the grooves 134 formed in the second abutting surface 133 is smaller than each sealing member 135. The outer diameter of the sealing member 135 can be inserted into the groove 134 from the opening of the groove 134 at the front end 101, and is less likely to fall from the opening of the second abutting surface 133, and each sealing member 135 is The radially outer periphery of the natural state protrudes slightly from the second abutment surface 133.

The collet 20 is mounted in the tapered groove 11 of the shank body 10 and includes a front end, a rear end, a clamping hole 21, a ring groove 22 and a plurality of slots 23, and the rear end of the collet 20 The utility model is disposed in the conical groove 11 and has a conical shape corresponding to the conical groove 11. The clamping hole 21 is inserted through the axial center of the collet 20 for clamping the cutter 40. The annular groove 22 is ring-shaped. And being radially recessed on the outer circumference of the collet 20, located near the front end of the collet 20, and at a position relative to the outer side of the shank body 10, the plurality of slits 23 are arranged at intervals in the ring The outer circumference of the hole 21 allows the collet 20 to have a deformable clamping capability.

The fixing nut 30 is screwed to the shank body 10, and includes a second locking portion 31 and a collet fixing portion 32. The second locking portion 31 and the collet fixing portion 32 are both ringed on The second locking portion 31 is screwed to the first locking portion 13 of the shank body 10, and includes an internal thread 311, a third abutting surface 312, and a fourth portion. The inner surface 311 is an inner trapezoidal thread matching the outer trapezoidal thread of the outer thread 131; the third abutting surface 312 and the fourth abutting surface 313 are respectively adjacent to the opposite two of the inner thread 311 The third abutting surface 312 corresponds to the position of the first abutting surface 132. The third abutting surface 312 and the first abutting surface 132 have matching diameters, and the matching gap of the diameter is less than 0.015 mm. The eccentricity of the fixing nut 30 when connected to the shank body 10; the fourth abutting surface 313 corresponds to the position of the at least one sealing member 135, and the diameter of the fourth abutting surface 313 and the second abutting surface 133 Matching, and the fourth abutting surface 313 is in interference fit with the sealing member 135 for eliminating the radial gap between the fixing nut 30 and the shank body 10; The collet 32 is in the second fixing portion fixing an end of the lock shank portion 31 remote from body 10, and the shape of the distal end 20 of the collet should, for pushing the collet 20 is fixed.

Referring to FIG. 5 and FIG. 6 , a second embodiment of the shank body 10A of the present invention, wherein the first locking portion 13A includes a groove 134A, and the groove 134A is annularly recessed on the second ridge. The outer periphery of the surface 133A is spaced apart from the front end 101A; the sealing member 135A is an O-ring elastic body and is disposed in the concave groove 134A, and is slightly convex to the second contact surface in a natural state. 133A and an interference fit with the fourth abutment surface 313 of the fixed nut 30.

Referring to FIG. 7 and FIG. 8 , a third embodiment of the tool holder body 10B of the present invention, wherein the first locking portion 13B includes a plurality of annular grooves 134B arranged in an annular interval and a plurality of seals. a portion 135B, and the number of the grooves 134B is not less than the number of the sealing members 135B, and each of the grooves 134B is recessed in the second abutting surface 133B and forms a space with the front end 101B; the seals Each of the members 135B is a spherical elastic body disposed in a groove 134B, and slightly protrudes from the second abutting surface 133B in a natural state, and has an interference fit with the fourth abutting surface 313 of the fixing nut 30.

Referring to FIG. 4, FIG. 6 and FIG. 8, the tool holder body 10, 10A, 10B and the fixing nut 30 of the present invention have external threads 131, 131A, 131B and second of the first locking portions 13, 13A, 13B. When the internal thread 311 of the locking portion 31 is screwed and connected, the matching gap between the first abutting surface 132 and the diameter of the third abutting surface 312 is less than 0.015 mm, and the fixing nut 30 and the arbor are restricted. The eccentricity of the main body 10, 10A, 10B is connected, and the fourth mate of the fixing nut 30 is fixed by the sealing members 135, 135A, 135B provided on the second abutting surface 133 of the shank body 10, 10A, 10B. The interference fit between the faces 313 eliminates the radial gap between the cutter body 10, 10A, 10B and the fixed nut 30, and eliminates the threaded clearance caused by the limitation of the machining accuracy of the thread, so that the cutter body 10, 10A, 10B and the fixed nut 30 are more stable, reducing the eccentricity during the connection, and effectively improving the dynamic balance of the cutter bar of the present invention at high speed, reducing the yaw and vibration when the cutter bar rotates, and Improve the machining accuracy when machining a workpiece using the tool holder of the present invention.

10, 10A, 10B‧‧‧ toolholder body

101, 101A, 101B‧‧‧ front end

102‧‧‧ Backend

11‧‧‧Tough groove

13, 13A, 13B‧‧‧ first lock

131, 131A, 131B‧‧‧ external thread

132, 132A, 132B‧‧‧ first face

133, 133A, 133B‧‧‧ second face

134, 134A, 134B‧‧ ‧ grooves

135, 135A, 135B‧‧‧ Seals

20‧‧‧ Collet

21‧‧‧ pinhole

22‧‧‧Circle

23‧‧‧ slotting

30‧‧‧Fixed nuts

31‧‧‧Second lock

311‧‧‧ internal thread

312‧‧‧ Third face

313‧‧‧ Fourth meeting

32‧‧‧Clamp fixing part

40‧‧‧Tools

D1‧‧‧ OD

D2‧‧‧ root diameter

80‧‧‧Tools

91‧‧‧Toolbar body

92‧‧‧ Collet

93‧‧‧ Nuts

911‧‧‧Outer trapezoidal thread

931‧‧‧Trapezoidal thread

PD‧‧‧ Path

P‧‧‧ pitch

1 is a perspective view of a first preferred embodiment of the present invention. Figure 2 is an exploded perspective view of a first preferred embodiment of the present invention. Figure 3 is a side cross-sectional view showing a first preferred embodiment of the present invention. Figure 4 is a partially enlarged side elevational cross-sectional view showing a first preferred embodiment of the present invention. Figure 5 is a partially enlarged perspective exploded view of the shank body of the second preferred embodiment of the present invention. Figure 6 is a partially enlarged side elevational cross-sectional view showing a second preferred embodiment of the present invention. Figure 7 is a partially enlarged perspective exploded view of the shank body of the third preferred embodiment of the present invention. Figure 8 is a partially enlarged side elevational cross-sectional view showing a third preferred embodiment of the present invention. Figure 9 is a side cross-sectional view of a conventional arbor. Fig. 10 is a partially enlarged side sectional view showing a conventional arbor.

Claims (7)

A tool holder for reducing assembly tolerance of a component, comprising a cutter body comprising a front end; a rear end; a tapered groove recessed at a front end of the cutter body; and a first locking portion, the ring is disposed at An outer circumference of the shank body is located at a front end of the shank body, and includes an external thread, which is an outer trapezoidal thread, and includes an outer diameter and a diameter; a first abutting surface adjacent to the external thread a side of the front end, the outer diameter of the first abutting surface is larger than the outer diameter of the outer thread; a second abutting surface adjacent to a side of the outer thread close to the front end, an outer diameter of the second abutting surface a diameter smaller than the outer diameter of the external thread; at least one groove recessed in the second abutting surface; and at least one sealing member disposed in the at least one groove, and the at least one sealing member is slightly convex in a natural state a second clamping surface; a collet disposed in the tapered groove of the shank body; and a fixing nut coupled to the front end of the shank body and including a second locking portion a ring is disposed on an inner circumference of the fixing nut, and a first locking portion of the shank body a screw connection comprising an internal thread as an inner trapezoidal thread matching the external thread of the shank body; a third abutting surface adjacent to the internal thread and corresponding to the first abutment of the shank body Position, the diameter of the third abutting surface is matched with the diameter of the first abutting surface of the shank body, and the diameter of the third abutting surface and the first abutting surface is less than 0.015 mm; and a fourth Abutting, adjacent to the position of the internal thread and at least one sealing member of the shank body, the diameter of the fourth abutting surface is matched with the diameter of the second abutting surface of the shank body, and the fourth The abutting surface is in interference fit with the at least one seal. The arbor according to claim 1, wherein the shank body comprises a plurality of the grooves and a plurality of the seals, and the number of the grooves is not less than the seals. The plurality of recessed grooves are recessed in a ring-shaped interval and are recessed on the second abutting surface of the shank body, and the second abutting surfaces are formed with openings, and the sealing members are respectively disposed in one of the grooves. The arbor according to claim 2, wherein each groove of the shank body extends along an axial direction of the shank body, and each of the seals is a cylindrical elastic body. The arbor according to claim 3, wherein each of the grooves forms an opening at a front end of the shank body, and an opening formed by each groove on the second abutting surface is smaller than an outer diameter of each sealing member. . The arbor according to claim 2, wherein each groove of the shank body is recessed on the second abutting surface, and each of the shank body forms a space with the front end of the shank body, and each sealing member is It is a spherical elastomer. The tool holder for reducing the assembly tolerance of any one of the items 2 to 5, wherein the grooves of the shank body are annularly equidistantly spaced apart from the second yoke of the shank body surface. The arbor according to claim 1, wherein the shank body comprises a groove and a sealing member, and the groove is annularly recessed on the outer periphery of the second abutting surface. And forming a spacing from the front end of the shank body, the sealing member being an O-ring elastic body.