Milling cutter with length-adjustable cutter bar

Abstract

The utility model provides a milling cutter with a length-adjustable cutter bar, and belongs to the technical field of milling cutters. The milling cutter with the length-adjustable cutter bar comprises a cutter handle and a cutter head, the tail end of the cutter head is fixedly connected with a threaded rod, the threaded rod is in threaded connection with the inner wall of the cutter handle, a pin lock mechanism is arranged on the cutter handle, pin holes matched with the pin lock mechanism are formed in the threaded rod, the pin holes are arrayed in the outer circle of the threaded rod, and the cutter head is fixedly connected with the cutter handle. The screw pitch of the pin hole corresponds to that of the threaded rod. The tool bit has the advantages that axial adjustment is achieved through rotation of the tool bit, locking of a fixed position is achieved through pin joint of the pin hole and the pin lock mechanism, the numerical value of length adjustment is one of several fixed and known values, the original point parameter of the tool bit can be conveniently and directly modified in a machine tool system, tool setting is not needed again, and the machining efficiency is improved. And the arrangement of pin joint is more stable and accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of milling cutters, in particular to a milling cutter with adjustable length of cutter bar. BACKGROUND

[0002] The length of the cutter bar of the existing alloy milling cutter is mostly fixed, and the length of the cutter bar cannot be adjusted according to the milling requirements. When deep holes need to be milled, the tool often needs to be replaced, and the use range is narrow.

[0003] To this end, Chinese patent application No. CN202221571142.X discloses a kind of alloy milling cutter with adjustable length of cutter bar, which is mainly by setting installation groove one, installation groove two, nut one, adjusting screw rod and extension rod, when using, by rotating adjusting screw rod, make adjusting screw rod rotate in nut one, to drive extension rod in installation groove two to extend and retract, to adjust the length of use of cutter bar, when length is adjusted, by rotating bolt rod on both sides, make bolt rod drive both sides of clamping block tightly clamped bolt rod, to limit the rotating position of bolt rod, avoid adjusting screw rod rotating when using cutter head.

[0004] However, the present application has found that the above-mentioned technology at least has the following technical problems in the process of implementing the technical solution in the embodiments of the present application:

[0005] 1. The extension rod adjustment distance is not fixed, and after adjustment, the tool needs to be re-adjusted, which is troublesome;

[0006] 2. The clamping block clamps the bolt rod to limit rotation, which is limited by the friction of the clamping block, and the clamping force is not stable and is easy to loosen;

[0007] 3. The bolt rods at both ends need to be rotated separately, which is relatively troublesome to operate. INVENTION CONTENTS

[0008] In order to make up for the above shortcomings, the present application provides a kind of milling cutter with adjustable length of cutter bar, to improve the problems mentioned in the above background art.

[0009] The embodiments of the present application provide a kind of milling cutter with adjustable length of cutter bar, including handle and cutter head, the tail end of the cutter head is fixedly connected with threaded rod, the threaded rod is screwed with the inner wall of the handle, the handle is provided with pin lock mechanism, the threaded rod is provided with pin hole matched with the pin lock mechanism, the pin hole array is in the outer circle of the threaded rod, and the pitch of the pin hole corresponds to the threaded rod.

[0010] In a specific embodiment, the threaded rod includes a threaded segment and a smooth rod segment, the threaded segment is screwed with the inner wall of the handle, and the pin hole is provided in the outer circle of the smooth rod segment.

[0011] In the above implementation process, the thread segment is short, the thread segment is screwed with the tool shank, and plays a role of axial extension and contraction, and the polished rod segment is used to set a pin hole to be connected with a pin locking mechanism.

[0012] In a specific embodiment, the outer circle of the polished rod segment is also provided with a scale, and the pitch of the thread segment corresponds to the scale and the pin hole.

[0013] In the above implementation process, the relative position of the scale on the polished rod segment and the end face of the tool shank is used to determine the extension and contraction distance of the tool head, which is more intuitive and convenient. Since the scale corresponds to the pin hole, when the pin locking mechanism is fixed with the pin hole, the length change value corresponds to the pitch of the thread segment. For example, the minimum graduation value of the long scale is 2mm, and the pitch of the thread segment is also 2mm. The axial distance changes by 2mm when the tool head rotates one circle. The axial distance adjustment amount of the tool head can only be locked in integer multiples of 2, that is, the length adjustment value is one of several fixed known values. Therefore, after adjusting the length, the fixed value can be changed directly on the original tool head original point in the machine tool setting.

[0014] In a specific embodiment, the polished rod segment is in sliding connection with the inner wall of the tool shank.

[0015] In the above implementation process, the polished rod segment is in small gap cooperation with the inner wall of the tool shank, which is used to reduce the cooperation gap of the tool head and the tool shank, and improve the coaxiality of the tool head and the tool shank.

[0016] In a specific embodiment, the pin locking mechanism includes a pin rod, the pin rod is in radial sliding connection with the tool shank, and the pin rod is movably inserted into the pin hole.

[0017] In a specific embodiment, the pin locking mechanism further includes a sliding sleeve, the sliding sleeve is in axial sliding connection with the tool shank, and the sliding sleeve movably abuts against the outer end of the pin rod.

[0018] In the above implementation process, the pin rod is pushed into the pin hole through the axial sliding of the sliding sleeve, the pin locking effect is realized, and the pin rod is limited by the sliding sleeve to avoid loosening from the pin hole.

[0019] In a specific embodiment, both ends of the pin rod are provided with spherical surfaces, and the pin hole is a spherical pit.

[0020] In the above implementation process, the lower end face of the sliding sleeve is also provided with a chamfer, which facilitates the inward movement of the pin rod. The spherical surface inside the pin rod facilitates the entry and exit of the pin hole. When the sliding sleeve is away from the pin rod, the tool head is rotated, and the spherical pin hole can force the pin rod to move outward, thereby being unlocked. Using one sliding sleeve can simultaneously act on multiple pin rods, and the operation is more convenient.

[0021] In a specific embodiment, the spring is arranged on the sliding sleeve.

[0022] In the above implementation process, the spring is used to limit the sliding sleeve to the pin rod, thereby avoiding loosening. It should be noted that the axial movement distance of the sliding sleeve needs to be limited to avoid the sliding sleeve from leaving the pin rod, thereby causing the pin rod to be separated from the tool holder.

[0023] Compared with the prior art, the beneficial effects of the present application are that the rotation of the tool head is used to realize the axial adjustment, and the pin connection of the pin hole and the pin locking mechanism is used to realize the locking of the fixed position, so that the length adjustment value is one of several fixed known values, which is convenient for directly modifying the tool head origin parameter in the machine tool system without re-dressing the tool, and the pin connection is more stable and accurate. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0025] Figure 1 is a schematic diagram of a milling cutter with adjustable length of tool rod provided by the embodiments of the present application;

[0026] Figure 2 is a schematic diagram of the connection relationship between the tool head and the tool holder provided by the embodiments of the present application;

[0027] Figure 3 is a schematic diagram of the connection relationship between the threaded rod and the tool holder provided by the embodiments of the present application;

[0028] Figure 4 is a schematic diagram of the cross-sectional structure of the tool holder provided by the embodiments of the present application.

[0029] In the figure: 10-tool holder; 20-tool head; 30-threaded rod; 31-threaded section; 32-plain rod section; 33-scale; 40-pin locking mechanism; 41-pin rod; 42-sliding sleeve; 43-spring; 50-pin hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in combination with the drawings in the embodiments of the present application.

[0031] Please refer to Figures 1-4The application provides a milling cutter with adjustable length of cutter bar, comprising a cutter handle 10 and a cutter head 20, the tail end of the cutter head 20 is fixedly connected with a threaded rod 30, the threaded rod 30 is screwed with the inner wall of the cutter handle 10, a pin locking mechanism 40 is arranged on the cutter handle 10, a pin hole 50 matched with the pin locking mechanism 40 is arranged on the threaded rod 30, the pin hole 50 is arranged in the outer circle of the threaded rod 30, and the pitch of the threaded rod 30 corresponds to the pin hole 50. The axial adjustment is realized by the rotation of the cutter head 20, the locking of the fixed position is realized by the pin connection of the pin hole 50 and the pin locking mechanism 40, the length adjustment value is one of the fixed known values, the original point parameter of the cutter head 20 in the machine tool system can be directly modified, the cutter need not be re-adjusted, and the pin connection is more stable and accurate.

[0032] Please refer to Figures 1-4 The threaded rod 30 comprises a threaded section 31 and a light rod section 32, the threaded section 31 is screwed with the inner wall of the cutter handle 10, and the pin hole 50 is arranged in the outer circle of the light rod section 32. The threaded section 31 is short, the threaded section 31 is screwed with the cutter handle 10, and plays a role in axial extension and contraction, and the light rod section 32 is used for arranging the pin hole 50 so as to be connected with the pin locking mechanism 40.

[0033] Please refer to Figures 1-4 The outer circle of the light rod section 32 is also provided with a scale 33, and the pitch of the threaded section 31 corresponds to the scale 33 and the pin hole 50. The relative position between the scale 33 on the light rod section 32 and the end surface of the cutter handle 10 is used to determine the extension distance of the cutter head 20, which is more intuitive and convenient, and since the scale 33 corresponds to the pin hole 50, when the pin locking mechanism 40 is pin-connected and fixed with the pin hole 50, the length change value corresponds to the pitch of the threaded section 31, for example, the minimum graduation value of the long scale 33 is 2mm, the pitch of the threaded section 31 is also 2mm, the axial distance changes by 2mm every rotation of the cutter head 20, and the axial distance adjustment amount of the cutter head 20 can only be locked in integral multiples of 2, that is, the length adjustment value is one of the fixed known values, therefore, after the length is adjusted, the fixed value on the original cutter head 20 original point in the machine tool setting can be directly changed.

[0034] Please refer to Figures 1-4 The light rod section 32 is slidably connected with the inner wall of the cutter handle 10. The light rod section 32 is matched with the small gap of the inner wall of the cutter handle 10, which is used for reducing the matching gap between the cutter head 20 and the cutter handle 10 and improving the coaxiality of the cutter head 20 and the cutter handle 10.

[0035] Please refer to Figures 1-4The pin locking mechanism 40 comprises a pin rod 41 which is in radial sliding connection with the tool shank 10 and is movably inserted into the pin hole 50. The pin locking mechanism 40 further comprises a sliding sleeve 42 which is in axial sliding connection with the tool shank 10 and movably abuts against the outer end of the pin rod 41. The pin rod 41 is pushed into the pin hole 50 through the axial sliding of the sliding sleeve 42 to realize the pin connection effect, and the sliding sleeve 42 is used to limit the pin rod 41 to avoid the pin rod 41 from being loosened from the pin hole 50.

[0036] Please refer to Figures 1-4 The two ends of the pin rod 41 are both provided with spherical surfaces, and the pin hole 50 is a spherical pit. The lower end surface of the sliding sleeve 42 is also provided with a chamfer to facilitate the inward movement of the pin rod 41, and the spherical surface inside the pin rod 41 facilitates the entry and exit of the pin hole 50. When the sliding sleeve 42 is away from the pin rod 41, the spherical pin hole 50 can force the pin rod 41 to move outward to be unlocked. One sliding sleeve 42 can be used to simultaneously act on multiple pin rods 41, and the operation is more convenient.

[0037] Please refer to Figures 1-4 The sliding sleeve 42 is provided with a spring 43. The spring 43 is used to keep the sliding sleeve 42 from loosening by limiting the pin rod 41. It should be noted that the axial movement distance of the sliding sleeve 42 needs to be limited to avoid the sliding sleeve 42 from being away from the pin rod 41, which causes the pin rod 41 to be separated from the tool shank 10.

[0038] The working principle of the length-adjustable milling cutter is as follows: the sliding sleeve 42 is pushed upward, and then the tool head 20 is rotated. The spherical pin hole 50 can force the pin rod 41 to move outward to be unlocked. After the tool head 20 is rotated by an integer number of turns, the distance of the extension and retraction of the tool head 20 is determined by the relative position of the scale 33 on the light rod section 32 and the end surface of the tool shank 10. Then the sliding sleeve 42 is released, and the pin rod 41 is pushed into the corresponding pin hole 50 under the action of the spring 43 to realize locking. Since the pin hole 50 corresponds to the scale 33, the tool head 20 can only be locked at fixed integer points, and the length adjustment value is also fixed at several points. Therefore, the tool head 20 origin can be directly modified on the machine tool system. In summary, the rotation of the tool head 20 is used to realize the axial adjustment, and the pin connection of the pin hole 50 and the pin locking mechanism 40 is used to realize the locking of the fixed position. Therefore, the length adjustment value is one of the fixed known values, which is convenient for directly modifying the tool head 20 origin parameter in the machine tool system without re-dressing the tool. The pin connection is also more stable and accurate.

[0039] The above merely provides examples of the present application, and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modified, improved or equivalent replacement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A cutter bar length adjustable milling cutter characterized by, The utility model provides a cutting tool, including handle (10) and cutter head (20), the tail end fixed connection of cutter head (20) has threaded rod (30), threaded rod (30) with handle (10) inner wall screw joint, handle (10) is provided with pin lock mechanism (40), threaded rod (30) is set up with the pin hole (50) of pin lock mechanism (40) adaptation, pin hole (50) array is in threaded rod (30) outer circle, pin hole (50) with the pitch of threaded rod (30) corresponds.

2. The adjustable length cutter bar of claim 1 wherein, The threaded rod (30) includes a threaded segment (31) and a smooth rod segment (32), the threaded segment (31) is screwed with the inner wall of the handle (10), and the pin hole (50) is arranged on the outer circle of the smooth rod segment (32).

3. The adjustable length cutter bar of claim 2 wherein, The outer circle of the smooth rod segment (32) is also provided with a scale (33), and the pitch of the threaded segment (31) corresponds to the scale (33) and the pin hole (50).

4. The adjustable length cutter bar of claim 3 wherein, The smooth rod segment (32) is slidably connected with the inner wall of the handle (10).

5. The adjustable length cutter bar of claim 4 wherein, The pin lock mechanism (40) includes a pin rod (41), the pin rod (41) is radially slidably connected with the handle (10), and the pin rod (41) is movably inserted into the pin hole (50).

6. The adjustable length cutter bar of claim 5 wherein, The pin lock mechanism (40) further includes a sliding sleeve (42), the sliding sleeve (42) is axially slidably connected with the handle (10), and the sliding sleeve (42) movably abuts against the outer end of the pin rod (41).

7. The adjustable length cutter bar of claim 6 wherein, Both ends of the pin rod (41) are provided with spherical surfaces, the pin hole (50) is a spherical pit, and the lower end surface of the sliding sleeve (42) is provided with a chamfer.

8. The adjustable length cutter bar of claim 7 wherein, The sliding sleeve (42) is provided with a spring (43).

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