JPH0117811B2 - - Google Patents
Info
- Publication number
- JPH0117811B2 JPH0117811B2 JP6027581A JP6027581A JPH0117811B2 JP H0117811 B2 JPH0117811 B2 JP H0117811B2 JP 6027581 A JP6027581 A JP 6027581A JP 6027581 A JP6027581 A JP 6027581A JP H0117811 B2 JPH0117811 B2 JP H0117811B2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- broach
- rough
- cutting
- guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005520 cutting process Methods 0.000 claims description 33
- 238000003754 machining Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D43/00—Broaching tools
- B23D43/02—Broaching tools for cutting by rectilinear movement
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling, Broaching, Filing, Reaming, And Others (AREA)
Description
【発明の詳細な説明】
本発明は、加工される穴の位置精度を向上させ
るようにした内面ブローチに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal broach that improves the positional accuracy of a hole to be machined.
内面ブローチ加工に用いられる丸ブローチを第
１図に示す。第１図においてプルエンドＰはブロ
ーチ盤のスライドに設けられたプルヘツドにより
チヤツキングされ、スライドが矢印方向に移動す
ることにより丸ブローチ加工を行なう。 Figure 1 shows a round broach used for internal broaching. In FIG. 1, the pull end P is chucked by a pull head provided on the slide of the broaching machine, and the slide moves in the direction of the arrow to perform round broaching.
切削刃Ｃは荒削り刃C1と仕上げ刃C2とによつ
てなり、切削が進むにつれてその外径が大きくな
るように配設され、最終仕上げ寸法まで進行して
加工完了する。このとき被加工物は最初にブロー
チの前部案内Ｆで下穴が位置決めされ、次いで切
削中は切削力によりボルスタ（被加工物を受ける
台）に押付けられて固定される。 The cutting blade C consists of a rough cutting blade C1 and a finishing blade C2 , and is arranged so that its outer diameter increases as the cutting progresses, and the cutting progresses to the final finishing dimension and the machining is completed. At this time, the prepared hole of the workpiece is first positioned by the front guide F of the broach, and then, during cutting, the workpiece is pressed and fixed against a bolster (a table for receiving the workpiece) by cutting force.
一方丸ブローチの切刃は同心円状に進行するた
め、理論上その切削力は切刃全周において平衡が
とれてセルフセンタリングされるが、実際はブロ
ーチの製作誤差や切刃の切れ味の全周における不
均一により、切削力の平衡が乱れてブローチに半
径方向の力（切削背分力の不均一量）が発生し、
一般的に細くて長いブローチは曲げられて加工穴
の中心がずれる。 On the other hand, since the cutting edge of a round broach advances concentrically, the cutting force is theoretically balanced and self-centered around the entire circumference of the cutting edge, but in reality, there are manufacturing errors in the broach and variations in the sharpness of the cutting edge around the entire circumference. Due to the uniformity, the balance of the cutting force is disturbed and a radial force (non-uniform amount of cutting back force) is generated on the broach.
Generally, long and thin broaches are bent and the center of the hole is shifted.
さらに、前述のごとく被加工物の位置は被加工
物の下穴がブローチの前部案内Ｆで位置決めされ
るため、ブローチ加工穴の位置精度は被加工物の
下穴の位置精度に大きく左右される。したがつて
内面ブローチにおいては加工穴の位置精度を保証
することが困難である。 Furthermore, as mentioned above, the position of the workpiece is determined by the pilot hole of the workpiece being positioned by the front guide F of the broach, so the positional accuracy of the broached hole is greatly influenced by the positional accuracy of the pilot hole of the workpiece. Ru. Therefore, in the case of an internal broach, it is difficult to guarantee the positional accuracy of the machined hole.
本発明は上述した内面ブローチにおける加工穴
位置精度を向上させることを目的とし、その要旨
は切削刃を第１荒刃、該第１荒刃につづく第２荒
刃および該第２荒刃につづく仕上げ刃とによつて
構成し、第１荒刃の外周にその底部が位置決め用
ガイド面となる溝を軸方向に刻設するとともに、
第２荒刃の切刃と切刃の間に前記第１荒刃で加工
された穴内面に接するガイドを設けたことを特徴
とするものである。 The purpose of the present invention is to improve the accuracy of the machined hole position in the above-mentioned inner surface broach, and the gist thereof is to provide a cutting edge with a first rough edge, a second rough edge following the first rough edge, and a second rough edge. A groove is carved in the axial direction on the outer periphery of the first rough blade, the bottom of which serves as a guide surface for positioning.
The present invention is characterized in that a guide is provided between the cutting edges of the second rough blades, the guide being in contact with the inner surface of the hole machined by the first rough blade.
以下本発明による実施を図面にもとずいて説明
する。第２図にブローチ全体を示す。図中、１は
切削刃であり、該切削刃１は第１荒刃２、第２荒
刃３および仕上げ刃４によつて構成されている。
第１荒刃２は第３図に示すように切刃５とガイド
６がそれぞれ円周を等分して３ケ所に形成されて
おり、第７図に示した第１加工部１０の切削を行
なう。なおｄは下穴径を示す。第２荒刃３は第４
図に示す切刃７と第５図に示すガイド８とが交互
に配設した状態で構成され、切刃７は第７図に示
した第２加工部１１の切削を行なう。仕上げ刃４
は第６図に示す通常の切刃９で構成され、所定の
仕上げ代１２を切削する。 The implementation of the present invention will be described below with reference to the drawings. Figure 2 shows the entire brooch. In the figure, 1 is a cutting blade, and the cutting blade 1 is composed of a first roughing blade 2, a second roughing blade 3, and a finishing blade 4.
As shown in FIG. 3, the first rough blade 2 has a cutting blade 5 and a guide 6 formed at three locations equally dividing the circumference, and is capable of cutting the first processing portion 10 shown in FIG. Let's do it. Note that d indicates the prepared hole diameter. The second rough blade 3 is the fourth
The cutting blade 7 shown in the figure and the guide 8 shown in FIG. 5 are arranged alternately, and the cutting blade 7 cuts the second processing portion 11 shown in FIG. 7. Finishing blade 4
is composed of a normal cutting edge 9 shown in FIG. 6, and cuts a predetermined finishing allowance 12.
第２荒刃３の切刃７は同心円状に径が大きくな
り最終刃の径は第１荒刃２のものと同径となつて
いる。第２荒刃３のガイド８は、第１荒刃２の切
刃５によつて加工された穴と相似形状をなしてい
るとともに、その外径は第１荒刃２の最終切刃径
より少し小さくなつており、ガイド８の外周部が
第１荒刃２による加工穴内面を案内する。上記ブ
ローチによつて穴加工するに際しては、図示しな
いブローチ盤に第８図に示すようなブローチガイ
ド１３を配設する。該ブローチガイド１３はその
先端が第１荒刃２のガイド６に当接可能で且つそ
れぞれ放射状にスライドできる。したがつてこの
ブローチガイド１３は、第１荒刃２による加工中
には前進してその先端がガイド６に当接すること
によりブローチを案内し、他の刃による加工中は
後退した位置にある。すなわち、このブローチで
は第７図に示すように被加工物の下穴径から仕上
加工径までを３部分に分けて切削するが、第１荒
刃２による加工では切刃５の部分（本実施例では
等分３ケ所）のみで切削が行われ、残りの刃のな
いガイド６部はブローチガイド１３により案内さ
れ、ブローチが切削力の不均一により曲るのを防
止する。第２荒刃３による加工になると、ブロー
チガイド１３は後退し、第１荒刃２で切削した被
加工物の内径によつてガイド８が案内され、第１
荒刃２での切削における残りの部分を加工する。
この時もブローチは、クランプされている被加工
物の内径により案内されているため切削力の不均
一によるブローチの曲りは防止される。 The diameter of the cutting edge 7 of the second rough blade 3 increases concentrically, and the diameter of the final blade is the same as that of the first rough blade 2. The guide 8 of the second rough blade 3 has a similar shape to the hole machined by the cutting blade 5 of the first rough blade 2, and its outer diameter is greater than the final cutting edge diameter of the first rough blade 2. The outer circumference of the guide 8 guides the inner surface of the hole machined by the first rough blade 2. When drilling holes using the broach, a broach guide 13 as shown in FIG. 8 is provided on a broaching machine (not shown). The tip of the broach guide 13 can come into contact with the guide 6 of the first rough blade 2, and can slide radially. Therefore, this broach guide 13 moves forward during machining with the first rough blade 2 and guides the broach by having its tip abut against the guide 6, and is in a retracted position during machining with the other blades. That is, as shown in FIG. 7, with this broach, the workpiece is cut in three parts from the pilot hole diameter to the finishing diameter. In the example, cutting is performed only at three equally divided locations, and the remaining 6 portions of the guide without blades are guided by the broach guide 13 to prevent the broach from bending due to uneven cutting force. When machining is started using the second rough blade 3, the broach guide 13 retreats, and the guide 8 is guided by the inner diameter of the workpiece cut by the first rough blade 2.
The remaining part of the cutting with the rough blade 2 is processed.
At this time as well, the broach is guided by the inner diameter of the workpiece being clamped, so bending of the broach due to uneven cutting force is prevented.
仕上げ刃４では仕上加工分だけを全周加工して
加工が完了する。 The finishing blade 4 processes only the finishing part around the entire circumference and completes the process.
以上の説明から明らかなように本発明によれば
切削力の大きくかかる荒加工部では、第１、第２
荒刃部共にブローチは外部より案内されており、
切削力の不均一によつて生ずるブローチの曲りす
なわち加工穴の偏心は防止され、加工穴の位置精
度は向上する。なお、仕上刃部は取代が少なく、
また、追隋式リトリバーヘツドにより支持された
リトリバーエンドに近くブローチ自身の剛性も大
きいためブローチは殆んど曲ることなく加工出来
る。 As is clear from the above description, according to the present invention, in the rough machining part where a large cutting force is applied, the first and second
Both the rough blade part and the broach are guided from the outside.
The bending of the broach, that is, the eccentricity of the machined hole caused by uneven cutting force is prevented, and the positional accuracy of the machined hole is improved. In addition, the finishing blade part has a small machining allowance,
In addition, since the broach itself is close to the retriever end supported by the retrieval type retriever head and has high rigidity, the broach can be processed with almost no bending.
第１図は従来のブローチを示す正面図である。
第２図〜第８図は本発明による実施例を示し、第
２図は正面図、第３図は第２図の−断面図、
第４図は第２図の−断面図、第５図は第２図
の−断面図、第６図は第２図の−断面
図、第７図は各刃の加工部位を示す説明図、第８
図はブローチとブローチガイドとの関係を示す平
面図である。
１……切削刃、２……第１荒刃、３……第２荒
刃、４……仕上げ刃、６……ガイド、８……ガイ
ド。
FIG. 1 is a front view of a conventional broach.
2 to 8 show an embodiment according to the present invention, FIG. 2 is a front view, FIG. 3 is a cross-sectional view of FIG. 2,
FIG. 4 is a sectional view of FIG. 2, FIG. 5 is a sectional view of FIG. 2, FIG. 6 is a sectional view of FIG. 8th
The figure is a plan view showing the relationship between the broach and the broach guide. 1...Cutting blade, 2...First roughing blade, 3...Second roughing blade, 4...Finishing blade, 6...Guide, 8...Guide.
Claims (1)
荒刃および該第２荒刃につづく仕上げ刃とによつ
て構成し、第１荒刃の外周にその底部が位置決め
用ガイド面となる溝を軸方向に刻設するととも
に、第２荒刃の切刃と切刃の間に前記第１荒刃で
加工された穴内面に接するガイドを設けたことを
特徴とするブローチ。1 The cutting blade is the first rough blade, and the second rough blade follows the first rough blade.
It consists of a rough blade and a finishing blade that follows the second rough blade, and a groove is carved in the axial direction on the outer periphery of the first rough blade, the bottom of which serves as a positioning guide surface, and a groove is formed in the axial direction on the outer periphery of the first rough blade. A broach, characterized in that a guide is provided between the cutting blades, the guide being in contact with the inner surface of the hole machined by the first rough blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6027581A JPS57178613A (en) | 1981-04-21 | 1981-04-21 | Broach |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6027581A JPS57178613A (en) | 1981-04-21 | 1981-04-21 | Broach |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57178613A JPS57178613A (en) | 1982-11-02 |
| JPH0117811B2 true JPH0117811B2 (en) | 1989-04-03 |
Family
ID=13137420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6027581A Granted JPS57178613A (en) | 1981-04-21 | 1981-04-21 | Broach |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57178613A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6314588B2 (en) * | 2014-03-27 | 2018-04-25 | 三菱マテリアル株式会社 | brooch |
-
1981
- 1981-04-21 JP JP6027581A patent/JPS57178613A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57178613A (en) | 1982-11-02 |
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