JP2012171026A - Boring device for hole in workpiece and working method of hole in the workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring device of hole in a workpiece, the entire scale of which can be reduced and which can perform simultaneous working of holes on the workpiece by two spindles or multi-spindles even when working pitch of holes of the workpiece is narrow, and also to provide a working method of the hole in the workpiece.SOLUTION: The hole 32 of the workpiece 30 is worked by inserting a main spindle 42, a cylindrical housing 46 for housing the main spindle 42 in a space 44 inside, bearings 48 installed in a plurality of places of the space 44 of the housing 46, and a tip 24 that is attached near the tip of the main spindle, into the hole 32 of the workpiece 30.

Description

  The present invention relates to a workpiece hole drilling apparatus and a workpiece hole drilling method for performing boring or precision machining on a hole formed in a workpiece.

  2. Description of the Related Art Conventionally, there is known a hole processing apparatus that widens a hole formed in a workpiece or performs precise processing on a hole (for example, Patent Document 1). Here, a conventionally known boring apparatus (hole processing apparatus) will be described with reference to FIG. The boring apparatus 10 includes a main shaft 12 such as a spindle that is rotated by a driving unit, an inner space 14, a shaft head main body 16 for accommodating a part of the main shaft 12 in the inner space 14, and a shaft head main body. 16, which is provided in an internal space 14, is a double-row cylindrical roller bearing 18 and a plurality of bearings 20 for rotatably holding the main shaft 12, and is fixed to one end side of the main shaft 12 and rotates together with the main shaft 12. A boring bar 22 and a chip 24 which is a cutting means attached to the boring bar 22 are provided.

  The plurality of bearings 20 are provided at two positions at intervals, and for example, two bearings 20 are provided adjacent to each other. The double row cylindrical roller bearing 18 is provided on the opposite side of the boring bar 22 with the two bearings 20 therebetween. A cylindrical inner collar 26 and an outer collar 28 are provided in the axial direction between the two bearings 20 in the inner space 14.

  The boring bar 22 is detachably attached to one end side of the main shaft 12 and rotates together with the main shaft 12. The boring bar 22 has a cylindrical tip insertion portion 34 that can be inserted into a hole 32 (32 a, 32 b, 32 c) formed in the workpiece 30. A tip 24 protruding to the side surface is attached near the free end of the distal end insertion portion 34. The length from the rotation center axis of the boring bar 22 to the tip of the tip 24 protruding in the lateral direction is set to be larger than the radius of the tip insertion portion 34. The length from the rotation center axis of the boring bar 22 to the tip of the tip 24 protruding in the lateral direction is set to be larger than the radius of the hole 32 formed in the workpiece 30 before processing.

  When boring the hole 32, the insertion tip 34 is inserted into the hole 32 of the work 30 while rotating the boring bar 22 (main shaft 12), and the hole 32 is boring with the chip 24.

JP2007-210088

  In a conventional boring apparatus, a boring bar 22 that fits the size of a hole 32 formed in the workpiece 30 is detachably attached to the main shaft 12. The diameter of the main shaft 12, the diameter of the bearing 20 that rotatably holds the main shaft 12, and the diameter of the head body 14 are made sufficiently larger than the diameter of the hole 32 of the workpiece 30. Only the boring bar 22 (insertion tip 34) to which the chip 24 is attached is inserted into the hole 32 formed in the work 30, and the main shaft 12 and the bearing 20 cannot be inserted into the hole 32. Thus, as a result of the bearing 20 not being able to enter the hole 32, in the conventional boring apparatus, the distance a from the cutting point of the hole 32 by the tip 24 to the position of the bearing 20 closest to the tip 24 becomes long. Therefore, there is a drawback that the cutting rigidity is lowered.

  On the other hand, in order to increase the cutting rigidity, the diameter of the main shaft 12 had to be increased. When the diameter of the main shaft 12 is increased, another problem that the entire processing apparatus (for example, the bearing 20 and the head body 16) becomes large occurs.

  A plurality of boring devices (hole processing devices) are arranged in parallel, and boring holes 32 (32a, 32b, 32c) formed in the workpiece 30 are simultaneously boring (holes) with two or more axes. If processing is to be performed, the pitch of the plurality of processing holes 32 (32a, 32b, 32c) formed in the workpiece 30 should not be a dimension equal to or greater than (the outer diameter of the bearing 20 + α (α = 3 to 5 mm)). Don't be. However, in the boring apparatus (hole machining apparatus), the main shaft 12, the bearing 20, and the head body 14 do not enter the hole 32 of the workpiece 30, so that when the pitch of the machining holes 32 is reduced, the two axes Alternatively, there is a drawback that simultaneous boring with multiple axes cannot be performed.

  The present invention makes it possible to reduce the size of the entire apparatus, and even when the machining pitch of a plurality of holes in the work is narrow, a work hole machining apparatus and a work hole capable of simultaneously machining two or multi-axis holes in the work. An object is to provide a processing method.

  A hole drilling device for a workpiece according to the present invention is a hole drilling device for machining a hole in a workpiece, wherein a main shaft, a cylindrical housing for accommodating the main shaft in a space formed therein, and the housing A plurality of bearings provided at a plurality of locations in the space and rotatably holding the main shaft, and a cutting means for machining the hole, which is attached in the vicinity of the tip of the main shaft. A bearing provided at a position close to the cutting means among the plurality of bearings is provided in the space of the insertion part near the cutting means in the housing, and the insertion part and the cutting means are inserted into the hole of the workpiece. However, the hole is machined by the cutting means.

  A workpiece drilling method according to the present invention includes a main shaft, a cylindrical housing for accommodating the main shaft in a space formed therein, and a plurality of locations in the space of the housing. Of a hole for machining a hole in a workpiece using a hole machining apparatus having a plurality of bearings that rotatably hold and a cutting means for machining the hole that is attached near the tip of the spindle. In the processing method, the space of the insertion portion close to the cutting means in the housing is provided with a bearing at a position close to the cutting means among the plurality of bearings, and the insertion portion and the cutting means are connected to the workpiece. The hole is processed by the cutting means while being inserted into the hole. According to the present invention, a plurality of the holes are formed in the workpiece, the hole drilling device is attached to the scale at the same interval as the pitch of the holes, and the main shaft, the bearing, and the housing of each of the hole drilling devices are attached. The insertion portion is inserted into each hole, and two or more holes are simultaneously processed by each hole processing apparatus.

  According to the present invention, since the main shaft and the bearing that holds the main shaft process the hole while entering the hole of the workpiece, the distance between the tip attached to the main shaft and the bearing closest to the tip is remarkably shortened. It becomes possible. As a result, the cutting rigidity can be increased, the spindle shaft diameter can be reduced, and the bearing that holds the spindle and the housing that holds the bearing can be reduced. As a result, the entire apparatus can be reduced, and space saving can be achieved.

  Furthermore, even in the case of a work in which a plurality of holes are formed at a short pitch, the apparatus according to the present invention has a size that allows the housing for holding the main shaft and the bearing to be inserted into the hole of the work. Simultaneous drilling of multiple axes is possible. The simultaneous machining of two or more axes can reduce the machining time for drilling and increase the number of workpieces produced per unit time.

It is sectional drawing which shows one Example of the hole drilling apparatus of the workpiece | work which concerns on this invention. It is sectional drawing which shows the conventional boring device.

  Next, the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a workpiece drilling apparatus according to the present invention. 1, the same reference numerals as those in FIG. 2 denote the same members. A workpiece drilling apparatus 40 according to the present invention includes a main shaft 42 such as a spindle rotated by a driving means (not shown), a cylindrical housing 46 for housing the main shaft in an internal space 44, a housing 46, which are provided in a space 44 inside the bearing 46, and are provided with bearings 48 such as a plurality of bearings provided at three positions at intervals in order to hold the main shaft 42 rotatably, and in the lateral direction near the tip of the main shaft 42. The tip 24 is a cutting means that protrudes and is attached to the head.

  For example, two bearings 48 are provided adjacent to each other at a plurality of bearings 48 provided at three positions at intervals. For example, an outer collar 50 and an inner collar 52 are provided in the axial direction of the space 44 between the two bearings 48 near the free tip of the main shaft 42. For example, an inner collar 54 is provided in the axial direction of the space 44 between the bearing 48 located second closest to the free tip of the main shaft 42 and the bearing 48 located farthest from the free tip of the main shaft 42.

  The cylindrical housing 46 has an insertion portion 56 (a part of the housing 46) having a diameter that can be inserted into a machining hole 32 (32a, 32b...) Formed in the workpiece 30. The insertion portion 56 is a portion close to the chip 24 in the housing 46, and in the space 44 at a position corresponding to the insertion portion 56 (housing 46), at least the bearing 48 at a position close to the chip 24 among the plurality of bearings 48. It has. It is desirable to provide a plurality of bearings 48 at two or more locations. The housing 46 is fixed to the scale 58 as an attachment member at a place other than the insertion portion 56. A plurality of bearings 48 are provided in the space 44 of the housing 46, and the main shaft 42 is rotatably attached to the housing 46 via the plurality of bearings 48. Several bearings 48 are provided in the space 44 corresponding to the insertion portion 56, and the bearing 48 at a position near the free tip side of the main shaft 42 is set to be a position to be inserted into the machining hole 32 of the workpiece 30 during machining. Has been.

  The free end in the axial direction of the main shaft 42 protrudes outward from the cylindrical housing 46, and the tip 24 is attached near the free end of the main shaft 42 that protrudes outward in the axial direction from the housing 46. The radial length R from the rotation center of the main shaft 42 to the tip of the tip 24 is longer than the radius of the insertion portion 56 of the cylindrical housing 46 and larger than the radius of the hole 32 before being formed in the workpiece 30. Is set.

  In the present invention, a plurality of bearings 48 are provided in the space 44 inside the housing 46, the main shaft 42 is rotatably provided in the space 44 of the housing 46, and the housing 46, several bearings 48, and the main shaft 42 are processed. Sometimes it is inserted into the hole 32 of the workpiece 30. As a result, when the distance between the bearing (bearing) 48 closest to the chip 24 and the mounting position of the chip 24 is A, the distance A is sufficiently shorter than the depth of the hole 32 of the workpiece 30. That is, the distance A between the bearing 48 closest to the chip 24 and the mounting position of the chip 24 in the present invention is the distance between the bearing 20 closest to the chip 24 and the mounting position of the chip 24 shown in FIG. Compared with a, it can be remarkably shortened. As a result, in the present invention, the cutting rigidity can be increased as compared with the conventional one.

  Since the cutting rigidity can be increased, the shaft diameter of the main shaft 42 can be reduced. As a result, the mechanical device can be made smaller than the conventional device, and space saving can be achieved as compared with the conventional device. . That is, since the shaft diameter of the main shaft 42 can be reduced, the outer diameter of the bearing 48 and the outer diameter of the housing 46 can be reduced, and the main shaft 42 and the outer diameter of the workpiece 30 are placed in the holes 32 (32a, 32b. A housing 46 can be inserted.

  In the present invention, the radius of the insertion portion 56 of the housing 46 is shorter than the distance from the center of rotation of the main shaft 42 to the tip of the tip 24. Moreover, the radius of the insertion part 56 of the housing 46 becomes smaller than the internal diameter of the processed hole 32 (32a, 32b ...). As a result, the pitch of the multiple housings 46 fixed to the scale 58 can be arranged at the same pitch as the pitch of the plurality of holes 32 (32a, 32b...) Formed in the workpiece 30. As a result, when the workpiece 30 is provided with a plurality of holes 32 (32a, 32b...), According to the present invention, the plurality of holes 32 (32a, 32b. Is possible. Therefore, in the present invention, the processing time can be shortened and the number of processed parts produced can be increased.

30 Workpiece 32 Hole 40 Hole Drilling Device 42 Spindle 44 Space 46 Housing 48 Ball Bearing 56 Insertion Portion 58 Icale

Claims (3)

  In a hole drilling apparatus for machining a hole in a workpiece, a main shaft, a cylindrical housing for accommodating the main shaft in a space formed therein, and a plurality of locations in the space of the housing are provided. An insertion portion close to the cutting means in the housing, comprising a plurality of bearings for rotatably holding the main shaft, and cutting means for machining the hole, which is attached near the tip of the main shaft. A bearing close to the cutting means among the plurality of bearings is provided in the space, and the hole is machined by the cutting means while the insertion portion and the cutting means are inserted into the hole of the workpiece. A hole drilling device for workpieces.   A main shaft, a cylindrical housing for housing the main shaft in a space formed therein, and a plurality of bearings provided at a plurality of locations in the space of the housing and rotatably holding the main shaft A hole machining method for machining a hole in a workpiece using a hole machining apparatus attached to the vicinity of the tip of the spindle and having a cutting means for machining the hole, the cutting in the housing A bearing close to the cutting means among the plurality of bearings is provided in the space of the insertion part close to the means, and the cutting means is inserted into the hole of the workpiece while the insertion part and the cutting means are inserted into the hole. A hole drilling method for a workpiece, wherein the hole is drilled.   A plurality of the holes formed in the workpiece, the hole processing device is attached to the scale at the same interval as the pitch of the holes, the main shaft of each of the hole processing devices, the bearing, and the insertion portion of the housing 3. The work hole drilling method according to claim 2, wherein two or more holes are simultaneously machined by each of the hole machining devices.

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