JPS6130305A - Module type cutting-edge holder for machine tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a modular type cutting blade holder that is attached to various machine tools, and in particular, the cutting blade holder is composed of a plurality of units, and each unit is This invention relates to a modular type cutting blade holder that can be replaced.

[Description of the Prior Art] In order to attach a cutting blade to the machine tool, a cutting blade holder is required that has a relay function between the machine tool and the cutting blade. This holder has conventionally been a single component, with one end provided with a portion for engaging the machine tool, and the other end provided with a holding portion for the cutting blade. In NC machine tools,
Since there are several types of chuck mechanisms that grip the cutting blade holder, it is necessary to have a cutting blade holder for each type of chuck mechanism, and it also differs depending on the type of cutting blade such as a drill, cutting tool, milling cutter, etc. It was necessary to have a cutting edge holding mechanism. As a result, processing companies must keep a wide variety of cutting blade holders in stock, depending on both the type of chuck mechanism of the machine tool and the type of cutting blade. First, there was a problem that the stock cost of the cutting blade holder increased.

In order to eliminate this problem, the cutting blade holder has a shank unit that connects to the machine tool, a head unit that holds the cutting blade, and an intermediate unit that connects the shank unit and the cutting blade holding head unit. There is one that consists of three bodies. With this configuration, it is only necessary to prepare the number of shank units that match the chuck mechanism of the machine tool.
In addition, the head unit only needs to have a number of different types of cutting blade holding mechanisms, compared to having to prepare all types of holders that match both the machine tool and the cutting blade. As a result, the number of parts stored in the holder can be significantly reduced, and for machining companies, it has become possible to reduce holder inventory costs.

In such cutting blade holders and holders made up of multiple units, the units are connected to each other by providing bolt holes in each unit and inserting bolts into the holes to connect and fix each unit. The tip of the unit was pressed against the unit on one side to secure it in place. However, in these conventional fixing methods, since the fixing means is provided in a direction perpendicular to the rotation axis, it is difficult to keep the central axes of the units the same. Moreover, since the fixing method is not strong, there is a problem in that the fixing part loosens due to vibrations etc. during long rotations, causing the position of the cutting blade to shift with respect to the central axis.

In addition, in machine tool machining, coolant is used to cool the cutting edge of the tool and remove cutting debris generated during machining, but conventional cooling methods use a coolant jet nozzle outside the cutting blade. It was designed to inject cooling fluid from the outside toward the cutting blade during machine operation.

However, with this conventional configuration, while it is possible to constantly inject coolant directly to the cutting edge in the case of external machining, it is not possible to inject the coolant directly to the cutting edge in the case of drilling or boring. there were. For this reason, there have been problems in that the cooling efficiency of the cutting blade is poor, the life of the cutting blade is shortened, and cutting waste cannot be smoothly discharged.

[Problem to be Solved by the Invention J The present invention has been made in view of the above points, and the cutting blade holder, which was conventionally a single unit, is composed of a plurality of units, and moreover, the cutting blade holder is made up of a plurality of units. The purpose of this is to strengthen the connection between the two units, and to eliminate misalignment of the cutting blades to enable highly precise machining.

Another object of the present invention is to allow a cooling liquid to pass through the inside of the holder constituted by the plurality of units, thereby constantly cooling the cutting edge and smoothly discharging cutting waste even during processing. The purpose is to do something.

[Means for Solving the Problems] In order to achieve the above-mentioned first object, the present invention includes a shank unit for connecting a holder to be attached to a machine tool having a cutting edge at the tip with the machine tool, and a cutting blade. It is composed of a head unit 7 having a blade, and an intermediate unit for connecting the shank unit and the head unit, and these units are connected by screws.

In order to achieve the second object, the present invention forms cooling liquid passage passages in each of the plurality of units, and when the units are connected, the passages communicate with each other. Cooling liquid is ejected towards the cutting blade.

[Example of the first invention] Next, the present invention will be explained based on the drawings.

FIG. 1 is a front view showing an embodiment of a modular type cutting blade holder for a machine tool according to the present invention. The cutting blade holder IO is composed of a shank unit 12 that is attached to a machine tool, a head unit 14 that supports the cutting blade, and an intermediate unit 16 for connecting the shank unit 12 and the head unit 14, They are said to be connectable and separable.

As shown in the cross-sectional view in FIG. 2, the shank unit 12 has a tapered part 18 formed on one side for connection with a chuck (not shown) of a machine tool, and a cylindrical recessed part 19 on the other side. is formed, and a female screw portion 20 for connecting with the intermediate unit 16 is formed inside the recessed portion 19 . In this shank unit 12, the number of taper parts 18, which are connection parts with machine tools, is provided in accordance with the type of machine tool used. Further, the configuration is not limited to the tapered portion 18, and may be configured in accordance with the connecting portion of the chuck of the machine tool.

As shown in the front view in FIG. 3, the intermediate unit 16 has a stepped portion 21 in the middle in its longitudinal direction that one end of the shank unit 12 comes into contact with, and the shank unit 12 is located on the smaller diameter side of the stepped portion 21. A cylindrical portion 22 that fits into the recessed portion 19 is formed, and a male screw portion 23 for screwing with the female screw portion 20 is formed at the tip of the protruding portion 22. On the other hand, a cylindrical recess 24 is formed on the other end,
A female screw portion 25 for connecting to the head unit 14 is formed inside the recessed portion 24 . This intermediate unit 16 serves to adjust the distance between the machine tool and the workpiece, and can be of various lengths depending on the machining state.

When the cylindrical recess 19 of the shank unit 12 and the protrusion 22 of the intermediate unit 16 are fitted together,
It is constructed with precise dimensions so that the central axes of the shank unit (12) and the intermediate unit (16) are on the same straight line.

The head unit 14, as shown in the front view in FIG.
A step portion 26 is formed in the middle in the longitudinal direction, with which one end of the intermediate unit 16 comes into contact, and a protrusion R2 that fits into the recessed portion 24 of the intermediate unit 16 is formed on the small diameter side of the step portion 2B.
7 is formed, and the female screw portion 2 is attached to the tip of the protruding portion 27.
A male threaded portion 28 is formed to be screwed together with 5. A mechanism for holding the cutting blade 30 is provided at the other end of the head unit 14.

When the cylindrical recessed part 24 of the intermediate unit 16 and the protruding part 27 of the head unit 14 are fitted together, the central axes of the intermediate unit 16 and the head unit 14 are on the same straight line. It is constructed with such precise dimensions.

In addition, a plurality of the intermediate units 16 may be connected in sequence, and when they are connected, the intermediate units 16 may have the same diameter and the connecting portions may have screws of the same standard, or
As shown in Fig. 5, even if the diameter of the intermediate unit (16°'-16'') toward the head unit (14) side is gradually reduced relative to the body diameter of the intermediate unit (1B) on the shank unit (12) side, Alternatively, the diameters of the screws in the connecting portions of these intermediate units may be gradually reduced.

Note that the joint between the shank unit 12 and the intermediate unit 16, and the joint between the intermediate unit 1B and the head unit 14 may be set to screws of the same standard.
That is, the male threaded portion 23 of the intermediate unit 16 and the male threaded portion 26 of the head unit 14 are the same, and the female threaded portion 20 of the shank unit 12 is the same as the female threaded portion 2 of the intermediate unit 16.
5 may be the same.

[Effects of the Invention] In the present invention configured as described above, the cutting blade holder 10 attached to the machine tool has the shank unit 1
2, a head unit 14 that holds the cutting blade 30, and an intermediate unit 16 that connects the shank unit 12 and the head unit 14, and these units are connected by screws.

During this screw connection, the cylindrical recess 19 of the shank unit 12 and the protrusion 22 of the intermediate unit 16 are fitted, thereby aligning the central axis of the shank 22) 12 and the intermediate unit 1'6. You can stay on the same line. Further, by fitting the cylindrical recess 24 of the intermediate unit 16 with the protrusion 27 of the head unit 14, the center axes of the intermediate unit 16 and the head unit 14 can be maintained on the same line.

In this way, in the conventional type, it was difficult to maintain the same center axis among the units, but in the present invention, it is possible to improve the reliability of the center axis of the cutting blade holder composed of a plurality of units. This eliminates wobbling in the position of the cutting edge.

Further, since the plurality of units are connected to each other by screws, if the direction of screwing is set in the opposite direction to the direction of rotation of the machine tool, the connection will not loosen even during long-term use.

As mentioned above, the intermediate unit 16 is generally an adapter used to deliver the cutting blade to the workpiece, and by connecting a plurality of intermediate units 16 to each other, the entire length of the holder IO can be adjusted freely. It becomes possible to adjust to.

At that time, as shown in Fig. 5, by sequentially reducing the diameters of the plurality of intermediate units 16-16' and 16'', it is possible to match the shape of the tapered hole, and in addition, the tip can be made thinner. By doing so, the torsional resistance at each position can be made uniform.

Furthermore, although the above embodiment shows the case where the intermediate unit 16 is used, if the distance is short, the female threaded portion 20 of the shank unit 12 and the male threaded portion 28 of the head unit) 14 may be of the same standard. It is also possible to directly connect the shank unit 12 and the head unit 14 if it is made suitable for use.

In addition, in FIG. 4, the number of cutting blades 30 attached to the head unit 14 is one, but a plurality of cutting blades may be attached.

[Embodiment of the second invention] Next, another invention that includes the main parts of the above invention will be described. This invention includes a shank unit, a heel/F unit having a cutting edge, as shown in the above invention,
Based on the structure of the invention, in which the intermediate unit for connecting the shank unit and the head unit can be connected and separated, a cooling liquid passage is formed inside the cutting blade holder.

FIG. 6 is a sectional view showing one embodiment of the shank unit 32 according to the present invention. At one end of the shank unit 32 is a taper portion 34 that engages with a chuck mechanism of a machine tool.
The other end has a female screw portion 36 that engages with an intermediate unit to be described later.
is formed. This shank unit 32 is provided with a cooling liquid passage 38 passing through it in the axial direction. The machine tool engaged with the shank unit 32 is provided with cooling liquid supply means communicating with said cooling liquid supply means and configured to introduce cooling liquid into the cooling liquid passage 38 during operation of the machine tool. There is. This cooling liquid passage 38
As shown in the enlarged view in Figure 7, there is a passage 3 in the middle of the passage.
Valve means 44° consisting of a pole valve 40 that opens and closes 8 and a spring 42 that presses it is provided.
4, the amount of cooling liquid supplied is adjusted appropriately.

FIG. 8 is a sectional view showing an embodiment of the intermediate unit 50 according to the present invention. The intermediate unit 50 has a male screw portion 52 at one end that engages with the female screw portion 36 of the shank unit 32, and a female screw portion 54 at the other end that engages with the head unit described later. . A cooling liquid passage 56 extends longitudinally through the center of the intermediate unit 50.
is provided. This cooling liquid passage 56 is set to communicate with the cooling liquid passage 38 of the shank unit 32 when the intermediate unit 50 and the shank unit 32 are connected.

FIG. 9 is a sectional view showing one embodiment of the head unit 60. This head unit 60 has a male thread 1 portion 62 at one end thereof which engages with the female thread portion 54 of the intermediate unit 50.
The other end is provided with a cutting blade 64. This head unit 60 is provided with a cooling liquid passage 66 that extends in the axial direction from the joint side with the intermediate unit 50 and extends halfway to the side surface. This cooling liquid passage 66 is connected to the head unit 6
0 and the intermediate unit 50 are connected so as to communicate with the cooling liquid passage 56 provided in the intermediate unit 50.

The cooling liquid passage 66 opens into a groove 68 formed in the longitudinal direction of the outer surface of the head unit 60 and extending to a position where the cutting blade 64 is mounted. This groove 68 is covered by a guide 70 as shown in perspective view in FIG. This guide 70 consists of a neck 72 that fits in and covers the groove 68 in the longitudinal direction, and a bottom 74 that is integrally formed at the end of the neck 72 and directs the cooling liquid toward the cutting blade 64. The cooling liquid introduced therein is made to flow toward the cutting blade 64 along the guide 70.

[Effects of the Invention] In the present invention configured as described above, first, the shank unit 32, intermediate unit 50, and head unit 60 are sequentially connected in the same manner as described above. These connections form a series of cooling liquid passages passing through the shank unit 32, the intermediate unit 50 and the head unit 60, into which cooling liquid is introduced during operation of the machine tool.

The cooling liquid introduced into this series of cooling liquid passages flows in the cooling liquid passage groove 68 along the guide 70 in the head unit 60 and is injected onto the cutting blade 64 .

Since the coolant can be sprayed from inside the holder toward the cutting blade 64, it can be used for machining that is difficult to spray from the outside of the cutting blade 64, such as drilling or boring. Since the cooling liquid can be constantly injected to the cutting blade 64 during machining, it is effective to extend the life of the cutting blade by cooling the cutting blade 64 and to discharge cutting debris.

Furthermore, a plurality of cutting blades 64 are attached to the head unit 60,
The number of grooves 68 and guides 70 may be provided in accordance with the number of cutting edges 64.

Note that the cooling liquid passage 6 formed in the head unit 60
The guide for directing the cooling liquid from 6 to the cutting blade 64 may have a shape such as a plate-shaped guide 76 shown in a perspective view in FIG.

Alternatively, as a method for introducing the cooling liquid from the cooling liquid passage 66 formed in the head unit 60 to the cutting blade 64, a tube extending from the opening of the cooling liquid passage 66 to the cutting blade 64 may be used.

[Other Embodiments of the Second Invention] Next, the provision of a cooling liquid passage inside the head unit will be shown. FIG. 12 is a sectional view of one embodiment of the head unit according to the present invention. - A cooling liquid passage 82 is formed in the axial direction inside the door unit 80, and this cooling liquid passage 82 extends to the mounting position of the cutting blade 84;
This cutting blade 84 has one side inside thereof as the cooling liquid passage 8.
A passage 86 is formed which leads to the cutting edge 2 and which opens to the cutting edge of the cutting blade 84 on the other side.

In this case, since the cooling liquid flows inside the head unit 80, there is no need for guided installation as in the previous embodiments, which not only reduces costs but also makes it more suitable for critical operations.

Furthermore, another example in which a cooling liquid passage is provided inside the head unit is shown in a partially sectional front view in FIG. The head unit body 90 is made of steel or a similar hard cutting material. That is.

The entire head unit is made of cutting blade material. A stepped portion 92 is formed in the middle in the longitudinal direction, and a plurality of spiral cutting edges 96 are formed on the outer surface of the large diameter portion 94 of this stepped portion 92. Between each spiral cutting edge 96,
A groove 98 is formed for discharging cutting waste. Inside this body 90, a coolant passage 100 is formed axially inward from the end on the side that is connected to the machine tool, and the coolant passage 100 extends radially into a plurality of pieces along the way. Each of the plurality of branch passages 102 opens into the groove 98 . The extension direction of the branch passage 102 from the open end may be directed to the most advanced part of the cutting blade 96, that is, the part that first contacts the workpiece and generates the most heat.

Since the cooling liquid is ejected evenly from the plurality of branch passages 102, the cutting edge of the cutting blade 96 can be cooled evenly, and uneven accumulation of cutting chips can be prevented.

Next, FIG. 14 shows a partially sectional front view of another example in which a cooling liquid passage is provided inside the head unit. The body 110 of the head unit is made of a material other than the cutting blade.

A plurality of protrusions 112 are formed at equal intervals around the rotation center axis on the opposite side of the body 110 from the retaining part with the intermediate unit, and between the protrusions 112, a cutting waste is discharged. A groove 114 is formed. A cutting edge 1 made of steel or a similar hard material is attached to the side surface of this protrusion 112.
16 is fixed. A portion of this cutting edge 116 protrudes outward from the tip of the protrusion 112, and cutting is performed by this protrusion.

Inside this body 11O, a cooling liquid passage 118 is formed in the axial direction from the end on the engagement side with the intermediate unit. This coolant passage 118 branches into a plurality of parts along the way, and the branch passage 1
20 is formed.

The branch passage 120 opens into the groove 114 .

The exit direction of this branch passage-1' 20 is
It is aimed at 16.

In this embodiment as well, since the cooling liquid is ejected evenly from the plurality of branch passages 120, the cutting edge of the cutting blade 116 can be cooled evenly, and uneven accumulation of cutting chips can be prevented. can.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a modular type cutting blade holder for machine tools according to the present invention, and FIG.
3 is a front view showing an embodiment of the intermediate unit shown in FIG. 1, and FIG. 4 is a head unit shown in FIG. 1. FIG. 5 is a front view showing a state in which a plurality of intermediate units are connected; FIG. 6 is a sectional view showing an embodiment of a shank unit according to another invention; FIG. 7 is a front view showing one embodiment of the shank unit; 6 is an enlarged view of the valve means provided in the shank unit of FIG. 6, FIG. 8 is a sectional view showing an embodiment of an intermediate unit coupled with the shank unit of FIG. 6, and FIG. 9 is a sectional view of the intermediate unit of FIG. A cross-sectional view showing an embodiment of the head unit to be combined, Figure 1 θ is a perspective view of a guide attached to the head unit, Figure 11 is a perspective view of another guide, Figure 12.1
3-14 each show a sectional view of another embodiment of the head unit. 10... Cutting blade holder, 12-32... Shank unit, 14/60
・80-・・・Het unit, 16・50...
...Intermediate unit, 19, 24, recess, 22, 27, protrusion, 20-25, 36◆54, female thread, 23
・28・52・62・・・・・・Male thread part, 30.6
4-84... Cutting blade. 38・56・66・82・・・Cooling liquid passage, 6
8...Groove, 70...Guide,
86...Aisle, 90/110...Head unit, 96-11
6... Cutting blade, 98, 114... Groove, 100-1'l 8... Cooling liquid passage, 102
・120... Branch passage. Figure 1 Figure 2 Figure 9 Figure 1I Figure 1011A Figure 12

Claims (7)

[Claims] (1) Consists of a shank unit that connects to a machine tool, a head unit that holds a cutting blade, and an intermediate unit that connects the shank unit and the cutting blade holding head unit, and connects these units. In a modular type cutting blade holder for a machine tool, the connection between each unit is such that one unit has a recess and a female thread is provided in the recess, and the other unit is fitted with the recess. A modular type cutting blade holder for a machine tool, characterized in that a protrusion and a male thread are provided on the protrusion, and the threads are connected by threading. (2) A plurality of intermediate units are connected between the shank unit and the head unit, and the diameter of the body of the intermediate units is increased on the shank unit side and gradually decreased toward the head unit side. A modular type cutting blade holder for a machine tool according to claim 1, characterized in that: (3) The coupling means for the shank unit and the intermediate unit and the coupling means for the intermediate unit and the head unit are of the same standard, so that the shank unit and the head unit can be directly screwed together. A modular type cutting blade holder for a machine tool according to claim 2, characterized in that: (4) Consists of a shank unit that connects to a machine tool, a head unit that holds a cutting blade, and an intermediate unit that connects the shank unit and the cutting blade holding head unit, and connects these units. In a modular type cutting blade holder for a machine tool, the connection between each unit is such that one unit has a recess and a female thread is provided in the recess, and the other unit is fitted with the recess. A protruding portion and a male screw portion are provided on the protruding portion, and the screw portions are connected by screwing,
A cooling liquid passage is formed in each of the shank unit, intermediate unit, and head unit, and
A modular type cutting blade holder for machine tools, characterized in that when the units are connected, the passages communicate with each other, and cooling liquid from the machine tool reaches the cutting blade via the passages. (5) Where the head unit is composed of a head unit body and a cutting blade, a cooling liquid passage formed inside the body is opened on a side surface of the body, and the cooling liquid is guided from the opening to the cutting blade. 5. A modular cutting blade holder for a machine tool according to claim 4, characterized in that the cutting blade holder is equipped with the following means. (6) Where the head unit is composed of a head unit body and a cutting blade, one end of the cooling liquid passage formed inside the head unit body is made to face the cutting blade, and the cooling liquid is applied to the cutting blade. 5. A modular cutting blade holder for a machine tool according to claim 4, wherein a through hole is formed to communicate with the passage, and the through hole opens at the cutting edge of the cutting blade. (7) A machine tool according to claim 4, characterized in that the cooling liquid passage formed inside the head unit is branched into a plurality of passages in the middle, and the branched ends are opened near the cutting blade. Modular type cutting blade holder for.