JP2603341Y2 - Face milling - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an improvement of a face milling machine and, when cutting a surface of a thin plate or the like, means for preventing deformation of a workpiece to be produced during the machining and enabling high-precision machining. It is about.

[0002]

2. Description of the Related Art FIG. 4 shows a state where a conventional face milling machine is cutting. The headstock 8 supports the rotating main shaft 3, and a plurality of cutting blades 7 are fixed symmetrically with respect to the center line on the periphery of the tip (lower side in the figure) surface of the cutter body 6 attached to the main shaft 3 and driven to rotate. Have been. The workpiece 2 is fixed on the table 5 with a holding bolt 9.
While the cutter body 6 is rotated by the main shaft 3 and the cutting blade 7 cuts the upper surface of the workpiece 2 in the drawing, the head stock 8 is cut.
Alternatively, the upper surface of the workpiece 2 is cut into a plane by the relative movement of the table 5 in the right and left directions or the direction perpendicular to the paper surface.

[0003]

The conventional face milling machine is as described above. However, when the workpiece 2 is a thin plate or the like and the surface thereof is cut, as shown in FIG. If the distance between the holding bolts 9 that suppresses the bolt 2 is large, the temperature of the cutting portion increases due to large heat generated in the cutting portion and expands, and the workpiece 2 is warped as shown exaggeratedly in FIG. When it rises, the cut amount becomes large and it cannot be finished to a predetermined thickness. In order to prevent this, as shown in FIG. 4, it is necessary to hold down the workpiece 2 using a large number of holding bolts 9. It is very troublesome to re-attach.
In addition, there is a problem in that when processing a thin plate or the like which is easily deformed even with such a trouble, the accuracy of the finished dimension is poor.

The present invention has been made in order to solve the above-mentioned problem, and it is possible to perform high-precision cutting of a workpiece, which is easily deformed due to processing distortion, only by fixing it with a small number of holding bolts. The aim is to obtain a face mill that can be made.

[0005]

According to the present invention, a face mill according to the present invention is provided with a work piece formed by a rotating cutting blade.
An annular ridge which is provided so as to surround a central portion of the front end surface of the cutter body at a height such that a predetermined minute gap exists between the surface and the surface and forms a concave portion for back pressure facing the surface inside the annular ridge; A fluid passage formed from the main body of the face milling machine through the main shaft to the recess surrounded by the annular ridge, and a high-pressure fluid is supplied to the recess surrounded by the annular ridge through the fluid passage. And a high-pressure fluid supply means for supplying the high-pressure fluid stored in the recess.
Suppresses warping of the workpiece due to processing distortion in the body
So as to apply a controlling back pressure to the surface of the workpiece.
It is characterized by having done .

[0006]

In the present invention, when cutting is performed by the face milling machine, the high-pressure fluid is supplied from the high-pressure fluid supply means through the fluid passage to the concave surface of the cutter body tip surface surrounded by the annular ridge.
Supply to the department. The annular ridge surrounds the central portion of the front end surface of the cutter body at a height such that a predetermined minute gap exists between the plane formed by the cutting blades, that is, the completed surface of the workpiece. Forming a recess facing the surface of
The high-pressure fluid flows out of a predetermined minute gap between the annular ridge and the surface of the workpiece to remove chips.
Meanwhile , a certain high pressure is maintained in the concave portion of the annular ridge , and the pressure of the high-pressure fluid in the concave portion is reduced by the back pressure.
The workpiece is then given to the workpiece and presses the workpiece against the table. This prevents lifting of the workpiece.
Therefore, it is possible to perform high-precision cutting without using a large number of holding bolts to prevent the processing distortion of the workpiece.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 6 denotes a cutter body, and the cutter body 6 is firmly attached to the main shaft 3 by an attachment means such as an attachment bolt with its axis aligned by a center metal 4. The main shaft 3 is rotatably supported by the headstock 8 with sufficient rigidity without play or the like, and is rotationally driven by a rotation driving device (not shown) via a main shaft rotating gear 35 and the like. A plurality of cutting blades 7 are fixed symmetrically with respect to the center line near the outer edge of the front end portion (lower end portion in the figure) of the cutter body 6. That is, each cutting blade 7 is attached so as to be located on one plane perpendicular to the center line of the cutter body 6. A workpiece 2 such as a thin plate is held on the table 5 by being held down by a holding bolt 9. In the illustrated face mill, the table 5 is horizontal, and the axis of the main shaft 3 is vertical, that is, vertical, with respect to the table 5. For example, the axis of the main shaft 3 is horizontal. ,
Of course, the surface of the table 5 may be perpendicular to the main shaft 3.

In this face mill, as shown in FIG. 1, a series of fluid passages, ie, oil holes 3c, 4c and 6c, are formed in the main shaft 3, center metal 4 and cutter body 6. The oil hole 3c of the main shaft 3 communicates with the main body of the face milling machine (not shown), and is connected to a high-pressure cutting oil supply pump (not shown). Oil hole 6 of cutter body 6
c is open at the center 6b of the front end surface of the body. A seal ring is provided at the connecting portion between the oil hole 3c of the main shaft 3 and the oil hole 4c of the center metal 4 and at the connecting portion of the oil hole 4c of the center metal 4 and the oil hole 6c of the cutter body 6 so that oil does not leak. Have been.

As shown in FIG. 2, an annular ridge 6d is formed around the center of the body tip surface where the oil hole 6c of the cutter body 6 opens. The annular ridge 6d is shown in FIG.
As shown in the figure, surround the center of the
And a recess 6b for back pressure inside thereof.
Is formed. In FIG. 2A, the height of the annular ridge 6d protruding downward is such that a predetermined minute gap exists between the annular ridge 6d and the processing completed surface 2a of the workpiece 2 cut by the cutting blade 7 as described later. It is formed to have a uniform height.

Next, the operation of the face mill will be described. As shown in FIG. 1, in order to cut the surface of the workpiece 2, first, the workpiece 2 is held down on the table 5 with holding bolts 9 and fixed. The main shaft 3 rotatably supported by the headstock 8 with sufficient rigidity without play or the like is rotationally driven by a rotation driving device (not shown) via a main shaft rotating gear 35 and the like. The cutter body 6 attached together is driven to rotate, and a large number of cutting blades 7 fixed to the outer edge of the distal end surface of the cutter body 6 symmetrically with respect to the center line are rotated and driven to be perpendicular to the rotation axis center line. The surface of the workpiece 2 is cut by moving relative to the table 5 on a plane.

If the workpiece 2 is a thin plate during this cutting process, as shown in FIG. 3, if the space between the retaining bolts 9 is wide and the retaining is insufficient, the workpiece 2 is cut. As a result, the workpiece 2 warps due to deformation due to a rise in temperature due to heat generation, so-called processing distortion, and cannot be cut accurately. Therefore, as shown in FIG. 4, it is necessary to hold down the workpiece 2 with a large number of holding bolts 9. In addition, there are cases where the mounting and removing of the holding bolts 9 must be repeated, which requires much labor and time. Therefore, in this face milling machine, as shown in FIGS. 1 and 2, when cutting a workpiece 2 such as a thin plate, a high pressure oil pump or the like (not shown) is used to attach the main shaft 3, center metal 4 and cutter body 6 to each other. High-pressure cutting oil is supplied through the drilled oil holes 3c, 4c, and 6c into the body tip surface of the cutter body 6.
Supply to the central part . Annular projection surrounding the center of the body tip
The ridge 6d is a concave portion 6b for back pressure facing the workpiece 2.
Since there is only a predetermined minute gap between the tip of the annular ridge 6d and the processing completion surface 2a of the workpiece 2, the oil supplied to the recess 6b The oil supplied into the concave portion 6b maintains a considerable pressure since it only flows out through the recess . This oil pressure is applied to the workpiece 2
A pressure as a back pressure is applied to press against the table 5 to prevent the workpiece 2 from warping. As a result, the face mill cuts the workpiece 2 such as a thin plate into an accurate thickness. In addition, the annular ridge 6d extends from the recess 6b .
The oil that has flowed out through the gap between the two flows out around the cutting blade 7 and out of the surrounding area, so that the chip is carried out, and the chip does not bite into the processing surface, and the finished surface is not damaged. Is prevented from occurring.

If the gap between the annular ridge 6d and the completed surface 2a of the workpiece 2 is too small and the annular ridge 6d abuts on the completed surface 2a, the cutting by the cutting blade 7 can be performed. If a gap occurs and the gap is too large, the outflow of oil increases and the pressure decreases, and the effect of suppressing the workpiece 2 may be insufficient. It is necessary to determine the height of the annular ridge 6d in consideration of these conditions.

A recess surrounded by the annular ridge 6d.
The larger the area of the portion 6b is, the larger the sum of the hydraulic pressures for holding the workpiece 2 is. However, it is also considered that the length of the annular ridge 6d becomes longer, the amount of oil leakage increases, and the oil pressure decreases. There is a need. The planar shape of the annular ridge 6d is circular in FIG. 2A, but is not necessarily circular. The annular ridge 6d shown in FIG.
Although one round is formed so as to surround all the openings of the plurality of oil holes 6c, a plurality of rounds may be formed, or may be formed for each oil hole 6c.

In the above embodiment, the high-pressure fluid supplied to the recess 6b is described as cutting oil. However, compressed air or the like may be supplied instead of oil. When using air, the amount of outflow from the annular ridge 6d is much larger than that of oil,
It is necessary to increase the supply.

[0015]

[Effect of the Invention] As described above, according to the invention, during cutting, the body formed around the center of the front end surface of the body is added.
Supply high-pressure fluid to the recess facing the workpiece and temporarily
Workpiece is pushed to the table by the pressure of the stored fluid
The work piece is deformed due to thin plate, etc.
Even those susceptible to, preventing deformation of the workpiece,
It is possible to cut to an accurate thickness dimension without taking much labor and time for holding down a workpiece as in the related art.
Further, since the preventing biting by eliminating high pressure fluid chips flowing out of the recess, that the wound occurs in the finished surface explosion
There is an effect that can be stopped .

[Brief description of the drawings]

FIG. 1 is a side sectional view of a face mill according to an embodiment of the present invention.

FIG. 2A is a side sectional view and FIG. 2B is a plan view of a tip surface of a cutter body tip of the face mill according to an embodiment of the present invention.

FIG. 3 is a side sectional view of a main part showing a cutting state of a conventional face milling machine.

FIG. 4 is a side sectional view of a conventional face milling machine.

[Explanation of symbols]

2: Workpiece, 2a: Finished surface, 3: Main shaft, 3c: Oil hole (fluid passage) , 4: Center metal, 4c: Oil hole (fluid passage) , 5: Table, 6: Cutter body, 6b: recess, 6c: oil holes (fluid passage), 6d: annular ridge, 7: cutting edge, 8: headstock, 9: restraining bolt.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23C 5/06 B23C 5/28

Claims (1)

(57) [Scope of request for utility model registration] 1. A target pressure formed by the cutting blade rotating
An annular ridge that surrounds the central portion of the front end surface of the cutter body at a height such that a predetermined minute gap exists between itself and the surface of the workpiece, and forms a concave portion for back pressure facing the surface inside the central portion. A fluid passage formed so as to open from the main body of the face milling machine through the main shaft to the recess surrounded by the annular ridge, and a high pressure is applied to the recess surrounded by the annular ridge through the fluid passage. And a high-pressure fluid supply means for supplying a fluid , and is stored in the recess.
Warpage change of the workpiece due to processing strain with high pressure fluid
Giving back pressure to the surface of the workpiece to suppress the shape
A face milling machine characterized in that: