JP2004142078A - Shrink-fit position setting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shrink-fit position setting tool for reliably regulating the insertion length of a tool into a tool holder with a simple structure. <P>SOLUTION: A circular hole 12 to hold a shank of a tool is formed at a center of a disk 11 formed of tool steel, a broadened approach 13 is formed via a parallel portion 16 narrower than the diameter of the circular hole 12, a partially circular slit 14 not reaching the approach 13 is formed between the circular hole 12 and the disk 11, a small hole 15 of the inside diameter larger than the width of the slit 14 is opened in both ends of the slit, and passages 17 narrower than the diameter of the circular hole 12 are provided from the circular hole 12 to the slit 14 across the vertical axis. <P>COPYRIGHT: (C)2004,JPO

Description

【００２６】
上記試作した焼嵌め位置設定治具について、▲１▼工具のシャンクへの装着容易性、▲２▼装着した治具の軸方向移動具合、▲３▼工具の把持力、▲４▼繰り返し着脱に対する耐久性を試験したところ、いずれの試作品も実用上問題はなかった。
【００２７】
【発明の効果】
以上説明したようにこの発明の焼嵌め位置設定治具は、全体が円盤状で工具のシャンクに装着したとき、治具に対して工具の軸は垂直になり、焼嵌めの際工具ホルダーの端面に当接する面も平面であるから、工具の軸と工具ホルダーの軸とがずれる恐れもない。また、治具はアプローチに沿って押し込むと部分円形のスリットの外側とスリットの両端の小孔部分から切り通しの部分でバネ作用で広がり軸に直行する方向から簡単に装着することができ、また、取り外すときも同様簡単で繰り返し使用にも耐久性がある。
【図面の簡単な説明】
【図１】この発明に係る焼嵌め位置設定治具の（ａ）正面図・側面図、（ｂ）同工具に装着した状態の斜視図
【図２】差込み長さ設定具（その１）の部分断面図で（ａ）差込み長さ設定前の状態、（ｂ）差込み長さ設定後の状態
【図３】差込み長さ設定具（その２）の（ａ）断面図、（ｂ）目盛り部分の正面図、（ｃ）設定範囲拡大例の断面図
【図４】焼嵌め作業を示す従来例の断面図
【符号の説明】
１０　焼嵌め位置設定治具
１１　円盤
１２　円孔
１３　アプローチ
１４　スリット
１５　小孔
１６　平行部
１７　切り通し
１８　工具[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shrink-fit position setting jig used when shrink-fitting a tool to a tool holder.
[0002]
[Prior art]
Patent Documents 1 to 3 disclose techniques relating to shrink-fitting position setting when shrink-fitting a tool to a tool holder.
[0003]
[Patent Document 1]
JP-A-11-077443 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-334622 (Summary and FIG. 1)
[Patent Document 3]
JP-A-2002-046029 (Summary and FIG. 1)
[0004]
In Patent Document 1, as shown in FIG. 4, a torsion spring 44 corresponding to the outer diameter of the tool 18 is fitted into the shank portion of the tool 18 to determine the insertion length in advance, and includes a heating means 42 and a cooling means 43. The tool 18 is inserted into the tool holder 45 loaded in the heating furnace 41 and shrink-fitted.
[0005]
The above-mentioned Patent Document 2 discloses a "regulator 20 for restricting an insertion amount L1 of a tool into a tool holder 10 provided with a chuck portion 12 for holding a tool shank portion by shrink-fitting. And the adjusting member 22 and the holding member 25. The holding member 25 has a male screw 26a which can be screwed into the female screw 13a of the center hole 13 of the holder 10. The regulating rod 21 is fixed integrally with the adjusting member 22, and the member is fixed. By rotating 22, the tip position of the regulating rod 21 is determined, and the insertion amount L1 is regulated. "
[0006]
The above-mentioned Patent Document 3 states that “when the tool (13) is coaxially inserted into the tool receiving portion, the movable contact piece (25) is brought into contact with the free end of the tool, and before the heating is started, the tool is The heating is achieved between the contact piece and the reaction force (33) exerted in the hole (11) of the tool receiving part in the direction opposite to the tool entry direction, so that the heating achieves a predetermined nominal size (s). After that, the shaft (12) is stopped when the shaft (12) enters the hole of the tool receiving portion. "
[0007]
[Problems to be solved by the invention]
In Patent Document 1, since a torsion spring is fitted to a shank of a tool, a contact portion with a tool holder is not flat, and therefore, a force is generated in which a shaft of the tool and a shaft of the tool holder are shifted, which is not preferable.
[0008]
Also, the torsion spring must be fitted from the end of the shank, and the decisive disadvantage is that if the diameter of the blade portion is larger than the shank, it cannot be removed after shrink fitting.
[0009]
Patent Documents 2 and 3 have complicated structures and are difficult to handle.
[0010]
In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a shrink-fit position setting jig having a simple structure and capable of reliably restricting the length of insertion of a tool into a tool holder.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention opens a circular hole for holding a shank of a tool at the center of a disk, forms a divergent approach through a parallel portion having a width smaller than the diameter of the circular hole, and forms A partially circular slit that does not reach the approach is formed between the outer periphery of the disk and a small hole having an inner diameter larger than the width of the slit at both ends of the slit, and the circular hole is formed from the circular hole to the slit. A through-hole having a width smaller than the diameter is provided in parallel with the vertical center line, and is subjected to a hardening heat treatment (Claim 1). In the shrink fitting position setting jig, the inner diameter D1 of the tool gripping portion, the slit diameter, D2, outer diameter D3 of the jig, inner diameter D4 of the small hole, width W1 of the cut, width W2 and length R of the parallel portion, width W3 of the slit, thickness t of the jig, and the shank diameter D of the tool as a reference. And satisfy the following conditions, The angle θ between the approach angle α, the vertical center line, and the center of the small hole at the slit end is defined as the following range (claim 2).
Note α = 15-20 ° θ = 60-80 °
D1 = D−0.3 to 0.5 (mm) D2 = D + 6 to 10 (mm)
D3 = D + 10 to 15 (mm) D4 = 1.5 to 2.0 (mm)
W1 = 0.3 to 0.4 D (mm) W2 = D-0.7 to 1 (mm)
W3 = 0.2 (mm) R = 1-2 (mm)
t = 2-3 (mm)
[0012]
According to the shrink-fitting position setting jig configured as described above, the tool axis becomes perpendicular to the jig when the entire jig is mounted on the shank of the tool, and the end surface of the tool holder is shrunk when shrink-fitting. Is also flat, so that the axis of the tool and the axis of the tool holder do not shift. In addition, when the diameter of the blade is larger than the diameter of the shank, such as a torsion spring, the problem that the blade cannot be removed is solved. It can be easily mounted from the direction perpendicular to the spreading shaft by the action of a spring at a portion penetrated from the hole, and it is also easy to remove it.
[0013]
The spring effect can be changed by decentering the center of the circle of the partial circular slit in the direction of the vertical center line.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a front view and a side view of a shrink-fit position setting jig according to the present invention, and FIG. 1B is a perspective view of the jig fitted to a tool.
[0015]
The shrink-fit position setting jig 10 has a circular hole 12 for holding a shank of a tool 18 at the center of a disk 11 made of, for example, tool steel or precipitation hardening stainless steel, and has a width smaller than the diameter of the circular hole 12. A divergent approach 13 is formed through the parallel portion 16, and a partially circular slit 14 that does not reach the approach 13 is formed between the circular hole 12 and the outer periphery of the disk 11. A small hole 15 having an inner diameter larger than the width is opened, and a cutout 17 having a width smaller than the diameter of the circular hole 12 is arranged in parallel with the vertical center line from the circular hole 12 to the slit 14 and subjected to a curing heat treatment. . The above-mentioned materials are not limited, and any material can be adopted as long as it does not lose its spring property during shrink fitting.
[0016]
The tool gripping portion inner diameter D1, slit diameter D2, jig outer diameter D3, small hole inner diameter D4, cut-through width W1, parallel portion width W2 and length R, and slit width of the shrink fit position setting jig 10. W3, the thickness t of the jig satisfies the following conditions based on the shank diameter D of the tool 18, and the angle θ between the approach angle α, the vertical center line, and the center of the small hole at the slit end is in the following range. .
Note α = 15-20 ° θ = 60-80 °
D1 = D−0.3 to 0.5 (mm) D2 = D + 6 to 10 (mm)
D3 = D + 10 to 15 (mm) D4 = 1.5 to 2.0 (mm)
W1 = 0.3 to 0.4 D (mm) W2 = D-0.7 to 1 (mm)
W3 = 0.2 (mm) R = 1-2 (mm)
t = 2-3 (mm)
[0017]
Next, how to use the shrink-fit position setting jig according to the present invention will be described. As shown in FIG. 1B, the shank of the tool 18 is strongly pushed along the approach 13 of the jig 10 to be mounted, and the axial movement is moved against the gripping force.
[0018]
FIG. 2 shows an insertion length setting tool 20 for a tool. The sleeve 21 has a female screw 25 inside and a knurled grip 23 formed on the outer periphery, and the knob 27 is integrally provided at the rear. It comprises a spindle 22 to be screwed and a double nut 26 for fixing the spindle 22.
[0019]
The insertion length setting of the tool is performed by setting a predetermined length by protruding a caliper depth measuring rod, moving the spindle 22 by turning a knob 27 of the insertion length setting tool 20, and using a vernier caliper to set the tip of the spindle 22. After positioning, the spindle 22 is fixed with a double nut.
[0020]
The shank of the tool 18 to which the jig 10 is attached is inserted as shown in FIG. Since the shank tip of the tool 18 does not reach the spindle 22, when the tool 18 is brought into contact with the tip of the pushing spindle 22 against the gripping force of the jig 10, the insertion length of the tool is set.
[0021]
FIG. 3 shows an insertion length setting tool 30 using a micrometer. A spindle 31 having a micrometer screw at the center, a sleeve 34 having a female screw 32 screwed to the micrometer screw, and a taper nut 33 for screwing adjustment are fitted around the outer periphery of the female screw 32 to form a sleeve. An inner sleeve 35 is fitted on the outer side of the tube 34, and a base line in the axial direction of the surface and a 0.5 mm scale are divided above and below the base line.
[0022]
The rear end of the spindle 31 is tapered 37 and the rear end of the thimble 36 is a tapered hole 38, and the screw 39 is tightened so that the spindle 31 and the thimble 36 are integrated. The scale is engraved. Reference numeral 40 denotes an eccentric cam for fixing the spindle 31.
[0023]
According to the insertion length setting tool 30, the dimension can be easily set to 1/100 mm without using calipers. Further, since the length of the micrometer screw is limited, when the insertion length becomes long, the end face of the spindle 31 is retracted from the reference plane A as shown in FIG. The scale of the thimble 36 and the inner sleeve 35 is adjusted by turning the inner sleeve 35 with a dedicated hook-shaped wrench.
[0024]
【Example】
Next, a shrink-fitting position setting jig according to the present invention corresponding to nine sizes of tool shank diameters of 3 to 25 mmφ was prototyped. Table 1 shows the dimensional configuration.
[0025]
[Table 1]

[0026]
For the prototype shrink-fitting position setting jig, (1) ease of mounting of the tool on the shank, (2) axial movement of the mounted jig, (3) gripping force of the tool, (4) against repeated attachment / detachment When the durability was tested, none of the prototypes had practical problems.
[0027]
【The invention's effect】
As described above, the shrink-fitting position setting jig of the present invention has a disk shape as a whole, and when mounted on the shank of the tool, the axis of the tool is perpendicular to the jig. Is also flat, so that the axis of the tool and the axis of the tool holder do not shift. Also, when the jig is pushed along the approach, it can be easily attached from the direction perpendicular to the axis by the spring action at the part cut out from the small hole at the outside of the partial circular slit and both ends of the slit, It is equally easy to remove and durable for repeated use.
[Brief description of the drawings]
1 is a front view and a side view of a shrink-fitting position setting jig according to the present invention, and FIG. 2B is a perspective view of the jig fitted to the same tool. (A) State before insertion length setting, (b) State after insertion length setting in partial cross-sectional view (FIG. 3) (a) Cross-sectional view of (2) insertion length setting tool, (b) scale part FIG. 4C is a sectional view of a conventional example showing shrink-fitting work.
DESCRIPTION OF SYMBOLS 10 Shrink fitting position setting jig 11 Disk 12 Disk hole 13 Approach 14 Slit 15 Small hole 16 Parallel part 17 Cut-through 18 Tool

Claims (3)

A circular hole 12 for holding the shank of the tool is opened at the center of the disk 11, and a divergent approach 13 is formed through a parallel portion 16 having a width smaller than the diameter of the circular hole 12. In between, a partially circular slit 14 that does not reach the above-mentioned approach 13 is formed, and a small hole 15 having an inner diameter larger than the width of the slit 14 is opened at both ends of the slit 14. A shrink-fitting position setting jig in which cutouts 17 having a width smaller than the diameter of the circular hole 12 are provided in parallel with the vertical center line. In the shrink-fitting position setting jig, the inner diameter D1, the slit diameter D2, the outer diameter D3 of the jig, the inner diameter D4 of the small hole, the width W1 of the through hole, the width W2 and the length R of the parallel portion, the width of the slit are set. W3, the thickness t of the jig satisfies the following conditions based on the shank diameter D of the tool, and the angle θ between the approach angle α, the vertical center line, and the center of the small hole at the slit end is in the following range. The shrink-fitting position setting jig according to claim 1, characterized in that:
Note α = 15-20 ° θ = 60-80 °
D1 = D−0.3 to 0.5 (mm) D2 = D + 6 to 10 (mm)
D3 = D + 10 to 15 (mm) D4 = 1.5 to 2.0 (mm)
W1 = 0.3 to 0.4 D (mm) W2 = D-0.7 to 1 (mm)
W3 = 0.2 (mm) R = 1-2 (mm)
t = 2-3 (mm) The shrink-fit position setting jig according to claim 1 or 2, wherein the center of the partial circular slit (14) is eccentric along a vertical center line.

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