JP2005118929A - Steel arbor for mounting rotating tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel arbor for mounting a rotating tool capable of working by reducing rotational run-out when a deep hole is bored to a material to be cut in the state of lengthy size of a long protruding length by using the rotating tool such as an end mill and a milling-cutter. <P>SOLUTION: The steel arbor 1 holds the rotating tool 5 at the axial end part. Balance weight 7 is attachably/detachably provided to the outer periphery in the vicinity of the tip of the arbor body 4 on the side of holding the rotating tool 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a steel arbor for mounting a turning tool, and more specifically, a turning tool is attached to a main spindle of a machine tool via a steel arbor, for example, a deep hole is machined in a long state with a long protrusion. The present invention relates to a steel arbor having a long overhang for use in attaching a turning tool.

  When high-speed machining is performed with a turning tool such as an end mill or a milling cutter, there arises a problem that the finished surface roughness deteriorates due to runout that increases as the tool rotates. In order to improve this problem, conventionally, a method of improving the dynamic balance by increasing the machining accuracy of the tool, particularly roundness, etc., has been used. However, a tool with a long protrusion (a long length between the shank and the cutting edge) is used. In the case of a scale drill or the like, the processing accuracy of the tool itself is limited.

  On the other hand, Japanese Patent Application Laid-Open No. 7-19288 (Patent Document 1) discloses an adjustment method in which a balance weight is attached in the vicinity of a holding portion of a tool holder to a machine tool to adjust a dynamic balance. Japanese Patent Application Laid-Open No. 11-179612 (Patent Document 2) discloses an adjustment mechanism for adjusting a dynamic balance by attaching a balance weight in the vicinity of a tool holding portion of a tool body of a turning tool.

However, in the case of the adjustment method disclosed in Patent Documents 1 and 2, in the rolling tool used in a long state where the protruding length from the spindle of the machine tool is long, the weight of the protruding portion is extremely large. Even if balance adjustment is performed in the vicinity of the holding portion of the tool holder to the machine tool or in the vicinity of the tool holding portion of the turning tool, the effect of reducing the rotational run-out is not always sufficient with the addition of a little weight.
JP 7-19288 A JP 11-179612 A

  The present invention has been made to solve the above-mentioned problems, and its purpose is to machine a deep hole in a work material in a long state with a long protrusion using a rolling tool such as an end mill or a milling cutter. In such a case, a steel arbor for mounting a rolling tool that can be processed with reduced rotational runout is provided.

  In order to achieve the above object, a steel arbor for turning tool attachment according to the present invention (Claim 1) is a steel arbor that holds a turning tool at an axial end, and holds the turning tool. A balance weight is detachably provided on the outer periphery near the tip of the arbor body on the side to be operated.

  In the above configuration, since the balance weight is detachably provided on the outer periphery near the tip of the arbor body on the side holding the cutting tool, the dynamic balance can be adjusted near the tip of the arbor. By attaching a rolling tool to the main spindle of the machine tool through a steel arbor, when machining a deep hole in the work material in a long state with a long protrusion, the rolling can be performed while suppressing rotational runout. In general, when drilling deep holes with a drill or the like with a longer protrusion length, or when rolling the side surface with an end mill or the like, when a rolling tool is attached to a steel arbor and the protrusion is lengthened There are many. In such cases, the milling tool is lighter than the steel arbor, so it is better to adjust near the tip of the steel arbor than to adjust the balance with the milling tool attached to the tip of the steel arbor. However, the effect of reducing vibration can be increased.

  In the steel arbor for turning tool mounting according to the first aspect of the present invention, a groove is formed in the outer periphery of the tip of the arbor body, and a balance weight is detachably provided in the groove (invention 2). By adopting such a configuration, it is possible to suppress the balance weight from protruding from the outer periphery of the arbor main body, and in addition to the above-described effects, the rolling processing is performed by suppressing the balance weight from coming into contact with the inner surface of the deep hole. Can do.

  According to the steel arbor for attaching a turning tool according to the present invention, when using a turning tool such as an end mill or a milling cutter when a deep hole is machined in a long state with a long protrusion, the rotational runout It is possible to carry out the rolling process while suppressing the above.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a steel arbor for mounting a rolling tool according to the present invention.

  In FIG. 1, a steel arbor 1 for attaching a turning tool is made of, for example, a steel material such as mold steel or SCM415, and a long arbor body 4 is integrated with a tapered shank portion 2 via a grip 3. Is formed. A groove 6 is formed in the circumferential direction on the outer periphery of the arbor body 4 near the tip on the side where the rolling tool 5 is attached, and a balance weight 7 is detachably attached to the groove 6 using a headless screw. ing. When the cutting tool 5 is an end mill or a milling cutter, a key 8 protrudes from the tip end of the arbor body 4 and engages with a key groove provided on the back surface of the cutting tool 5 for rolling. It has a structure for transmitting a rotational force to the cutting tool 5 (see FIG. 1a). Further, when the turning tool 5 is a drill or a boring tool, a chuck for chucking the shank of the turning tool 5 is built in the arbor body 4 and is chucked by the chuck for rolling. The structure is such that a rotational force is transmitted to the tool 5 (see FIG. 1b). On the other hand, the shank part 2 is a part attached to the main shaft 9 of the machine tool.

  In the steel arbor 1 for mounting a rolling tool having the above-described configuration, the balance weight 7 is detachably provided on the outer periphery in the vicinity of the tip of the arbor body 4 on the side that holds the rolling tool 5. Dynamic balance can be adjusted. Accordingly, by attaching the rolling tool 5 to the spindle 9 of the machine tool via the steel arbor 1 for attaching a rolling tool, when machining a deep hole in a work material in a long state with a long protrusion, Rolling can be performed with reduced runout.

  A test milling tool mounting steel arbor 11 having the same shape as that shown in FIG. 1 and having the dimensions shown in FIG. 2 was fitted with a 1 kg weight end mill 12 having a carbide cutting edge to adjust the balance. The run-out with respect to the spindle speed when the test was performed and when the test was not performed was measured. The result is shown in FIG. In addition, the steel arbor 11 for attaching a turning tool uses SCM415 and has a weight of 11 kg.

  As is apparent from FIG. 3, when the balance adjustment is performed using the steel arbor 11 for mounting a rolling tool according to the present invention, the amplitude of the rotational runout of the rolling tool 12 is greatly reduced as compared with the case where the balance is not performed. I can see that

It is a side view of the steel arbor for turning tool attachment concerning this invention, Comprising: a is a case where an end mill is attached, b is a case where a drill is attached. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the steel arbor for a rolling tool for a test which concerns on this invention, Comprising: a is a side view, b is an AA arrow line view of a. It is a graph which shows the relationship between a spindle speed and the runout of the front-end | tip part of a turning tool (end mill).

Explanation of symbols

1: Steel arbor for turning tool attachment 2: Shank part 3: Grip 4: Arbor body 5: Turning tool 6: Groove 7: Balance weight 8: Key 9: Spindle of machine tool 11: Steel for attaching turning tool Arbor 12: End mill

Claims (2)

  In a steel arbor that holds a cutting tool at an axial end, a rolling tool is provided with a detachable balance weight on the outer periphery in the vicinity of the tip of the arbor body on the side that holds the cutting tool. Steel arbor for mounting. The steel arbor for turning tool attachment according to claim 1, wherein a groove is formed in an outer periphery near the tip of the arbor body, and a balance weight is detachably provided in the groove.