JP2007301701A - Surface machining tool and machining method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface machining tool having high accuracy and superior in productivity and a machining method using the same. <P>SOLUTION: The surface machining tool 1 is mounted to a rotary shaft of a machining device and machines the both surfaces of a workpiece simultaneously. The surface machining tool is equipped with a cylindrical upper side tool body part 2 having a mounting part 3 mounted to the rotary shaft, a spacer 5 which is jointed to the upper side tool body part 2 at the opposite side of the mounting part 3 and has a length corresponding to the machining size of the workpiece, and a cylindrical lower side tool body part 4 which is jointed to the spacer 5 so as to be parallel to the upper side tool body part 2. A plurality of cutting blades 6a are disposed at a predetermined interval on the respective inner surface outer edges 2a, 4a facing to the upper side tool body part 2 and the lower side tool body part 4 or the respective outer peripheral surfaces 2b, 4b of the upper side tool body part 2 and the lower side tool body part 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a surface processing tool for performing surface processing on a connecting portion of a workpiece such as a suspension arm, a knuckle, or the like, and a processing method using the surface processing tool.

  In general, an automobile undercarriage part such as a suspension arm is formed by casting or forging and then machined. For example, the suspension arm is first formed into a rough shape by casting or forging, and a connecting portion connected to a structural member such as a suspension member requires high dimensional accuracy. Without being used in a forged surface state (usually a black skin surface state), the dimensions are adjusted by machining (surface processing, hole processing). For example, Patent Document 1 describes an example of a knuckle as a representative example of a component that is machined from multiple directions.

  Conventionally, as a surface machining tool, as shown in FIG. 7A, a front milling machine 20 is used in which cartridges 22 having cutting edges 23 are arranged at predetermined intervals on the outer peripheral surface 21a of the main body 21 on the workpiece side. It was. Then, as a surface processing method, as shown in FIG. 7B, the surface 11a (13a) of the workpiece (the bush portion 11 or the ball joint portion 13 which is a connecting portion of the workpiece in the figure) by the front milling machine 20. Then, the method of reversing the workpiece and surface-treating the back surface 11b (13b) has been performed.

  As shown in FIG. 8A, an end mill 30 having cutting edges on the outer peripheral surface and the tip surface may be used as a surface machining tool. Then, as shown in FIG. 8B, the workpiece (the bush portion 11 or the ball joint portion 13 which is the connecting portion of the workpieces) is set in the Z-axis direction (tool entry / exit direction) of the end mill 30. Then, the surface 11a (13a) of the work piece is surface-finished with the cutting edge on the outer peripheral surface of the end mill 30 (S101), then the end mill is moved (S102 to S104), and the back surface 11b (13b) of the work piece There has also been a processing method of surface processing (S105).

Further, in the hole processing, a hole is formed by drilling. At this time, if a drill having a large outer diameter is used from the first machining, a large torque is generated, the processing machine may stop, and the drilling tool may be shaken. For this reason, as shown in FIG. 9 (a), generally, first, a drill 40 having a small outer diameter is used to prepare a pilot hole in a workpiece (bush portion 11 or ball joint portion 13 which is a connecting portion of the workpiece). As shown in FIG. 9B, finishing was performed with a drill 41 having a larger outer diameter. In addition, as shown in FIG. 9C, after drilling a pilot hole with a thin drill, a finishing process may be performed with a boring bar 42. The finishing process by the boring bar 42 is also described in Patent Document 2, for example.
JP 2002-301626 (paragraphs 0002 to 0003, FIG. 10) Japanese Patent Laying-Open No. 2005-246500 (paragraphs 0002 and 0003)

  However, in the processing of the front and back of the workpiece, the conventional surface machining tool and the surface machining method require a step of inverting the workpiece or a step of moving the surface machining tool. The productivity was low. In addition, there is a problem that it is difficult to center the surface machining tool on the workpiece, and high machining accuracy cannot be obtained. Also in the hole drilling method, the hole drilling is performed after the pilot hole drilling is performed. Therefore, the number of processes is increased, and a plurality of drilling tools are used to open one drilling hole. Therefore, it takes time to set up the drilling tool and the productivity is low. In addition, there is a problem that it is difficult to center each tool with respect to the workpiece, and high machining accuracy cannot be obtained.

  The present invention has been made in view of the above problems, and an object thereof is to provide a surface machining tool having high machining accuracy and excellent productivity, and a machining method using the same.

  In order to solve the above-mentioned problem, a surface processing tool according to claim 1 is a surface processing tool that is mounted on a rotating shaft of a processing machine and simultaneously processes both surfaces of a workpiece, and is mounted on the rotating shaft. A cylindrical upper tool main body provided with a portion, a spacer bonded to the upper tool main body on the opposite side of the mounting portion, and having a length according to the machining dimension of the workpiece, and the upper tool A cylindrical lower tool main body portion joined to the spacer so as to be parallel to the main body portion, and an outer edge of each inner surface facing the upper tool main body portion and the lower tool main body portion, or the upper side This is configured as a surface machining tool in which a plurality of cutting blades are arranged at predetermined intervals on the outer peripheral surfaces of the tool body and the lower tool body.

  If comprised in this way, an upper tool main-body part and a lower tool main-body part will be isolated via the spacer which has the length matched with the process dimension of the to-be-processed object. Thereby, adjustment of the processing amount of the cutting blade arrange | positioned at an upper tool main-body part and a lower tool main-body part becomes easy. In addition, the upper tool body and the lower tool body can be easily centered with respect to the work piece, and the cutting blades disposed in the upper tool body and the lower tool body are arranged so as to face each other. Is done. As a result, processing accuracy and productivity are improved.

  According to a second aspect of the present invention, there is provided a machining method comprising: a first step of performing surface machining on a workpiece using the surface machining tool according to claim 1; and a hole machining in the workpiece surface-machined in the first step. The procedure includes a second step to be performed.

  According to such a procedure, the front and back of the workpiece are simultaneously machined by using the surface machining tool according to claim 1 in the first step. Thus, as in the conventional machining method, a plurality of processes such as first surface machining, workpiece reversal, and second surface machining, or first surface machining, tool movement, and second surface machining. Surface processing can be performed in one step without taking a plurality of steps, and the variation in the processing amount of the workpiece is reduced. As a result, processing accuracy and productivity are improved.

  According to a third aspect of the present invention, there is provided a first method for performing a hole machining on a workpiece, and performing a surface machining on the workpiece drilled in the first step using the surface machining tool according to the first aspect. The procedure includes a second step to be performed.

  According to such a procedure, similarly to the machining method according to claim 2, by using the surface machining tool according to claim 1 in the second step, the front and back of the workpiece are simultaneously surfaced in one step. Processing can be performed, and variation in the processing amount of the workpiece is also reduced. As a result, processing accuracy and productivity are improved.

  According to a fourth aspect of the present invention, there is provided a processing method in which the hole processing forms a processing hole having a predetermined inner diameter (D) using a hole processing tool having cutting edges on an outer peripheral surface and a front end surface. The outer diameter (d) is smaller than the inner diameter (D) of the processing hole, and the hole processing tool is sent in the thickness direction of the workpiece by a spiral track of (inner diameter (D) −outer diameter (d)). Is.

  According to such a procedure, contact between the workpiece and the tool is achieved by using a drilling tool having an outer diameter smaller than the inner diameter of the formed hole to be fed in a spiral path in the thickness direction of the workpiece. The area is small, and the frictional resistance is remarkably reduced as compared with the conventional large diameter drilling. Further, it is not necessary to perform the pilot hole machining as in the prior art, and it is possible to perform the hole machining by sending one tool once without using a plurality of tools. As a result, processing accuracy and productivity are further improved.

  According to a fifth aspect of the present invention, there is provided a processing method in which the hole processing forms a processing hole having a predetermined inner diameter (D) using a hole processing tool having cutting edges on an outer peripheral surface and a front end surface. The outer diameter (d) is smaller than the inner diameter (D) of the processing hole, and the hole processing tool is sent to the processing surface of the workpiece by a circular path of (inner diameter (D) −outer diameter (d)). , And a stepwise feeding procedure in the thickness direction of the workpiece.

  According to such a procedure, using a hole processing tool having an outer diameter smaller than the inner diameter of the formed hole, the circular direction is sent to the processing surface of the workpiece, and the thickness direction of the workpiece By stepwise feeding, the frictional resistance is remarkably reduced as in the fourth aspect. Moreover, it becomes possible to perform hole processing by sending one tool once without using a plurality of tools. As a result, processing accuracy and productivity are further improved.

  According to a sixth aspect of the present invention, there is provided a machining method in which the hole machining forms a machining hole having a predetermined inner diameter (D) using a hole machining tool having cutting edges on an outer peripheral surface and a tip surface. A spiral having an outer diameter (d) smaller than the inner diameter (D) of the machining hole, and the hole machining tool having a maximum diameter of (inner diameter (D) −outer diameter (d)) with respect to the machining surface of the workpiece. This is a procedure of sending in a trajectory and stepwise in the thickness direction of the workpiece.

  According to such a procedure, using a drilling tool having an outer diameter smaller than the inner diameter of the formed hole, the tool is fed in a spiral path to the processing surface of the workpiece, and the thickness direction of the workpiece By stepwise feeding, as in claims 4 and 5, the frictional resistance is significantly reduced. Moreover, it becomes possible to perform hole processing by sending one tool once without using a plurality of tools. As a result, processing accuracy and productivity are further improved.

  According to the surface machining tool and the machining method using the same according to the present invention, the machining accuracy is high and the productivity is excellent. Further, by improving the processing accuracy, it is possible to reduce the surplus of the workpiece (casting material or forging material) to allow for the processing cost, so that the material yield is also improved.

<Surface machining tool>
First, an embodiment of the surface machining tool of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a surface machining tool, and FIG. 2 is a plan view of a suspension arm.

  The surface machining tool of the present invention is mounted on a rotating shaft of a processing machine to simultaneously process both surfaces of a workpiece. Here, the workpiece is an automobile undercarriage part such as a suspension arm or a knuckle, and particularly a connecting part that is connected to a structural member such as a suspension member. FIG. 2 shows a typical example of a suspension arm. As shown in FIG. 2, the suspension arm 10 is connected to a connecting portion (ball joint portion 13) for connecting to a knuckle (not shown) connected to the wheel and a bracket (not shown) on the vehicle body side. It has a connecting part (bush parts 11, 11) and is connected by an arm part 12. The suspension arm 10 is usually made of aluminum or an aluminum alloy (JIS-defined 4000 series, 6000 series, or an improved material thereof).

  As shown in FIG. 1, the surface machining tool 1 </ b> A includes an upper tool body 2, a spacer 5, and a lower tool body 4. Each configuration will be described below.

(Upper tool body)
The upper tool body 2 has a cylindrical shape, and is provided with a mounting portion 3 that is mounted on a rotating shaft (not shown) of a processing machine (not shown). The mounting portion 3 is formed so as to protrude from the center of the outer surface of the upper tool body portion 2 in a substantially cylindrical shape, and a key groove for mounting to the rotating shaft is provided at the center. The upper tool body 2 (surface machining tool 1A) is attached to the rotary shaft via the keyway (mounting portion 3). If the rotation of the rotation shaft can be transmitted to the upper tool body 2 (surface machining tool 1A). A means other than the keyway may be provided in the mounting portion 3.

  Further, the upper tool main body 2 is disposed so as to face the lower tool main body 4 through the spacer 5 by joining a spacer 5 to a surface opposite to the surface on which the mounting portion 3 is formed. . A plurality of cutting blades 6a are arranged at predetermined intervals on the inner surface outer edge 2a or the outer peripheral surface 2b of the upper tool main body 2 facing the lower tool main body 4.

  As the cutting edge 6a, for example, a base made of cemented carbide or the like mainly composed of WC-Co and brazed with PCD (sintered diamond) or CBN (cubic boron nitride sintered body) is used. . And the space | interval of the cutting blade 6a in the circumferential direction of the upper tool main-body part 2 is set by the angle which the axis line center of the upper tool main-body part 2 and the cutting blades 6a and 6a make, and the outer diameter of the upper tool main-body part 2 is about 200 mm. In this case, 10 to 45 ° is preferable. The outer diameter of the upper tool body 2 is set according to the thickness of the workpiece. For example, when the thickness of the workpiece is about 35 mm, the outer diameter is preferably about 165 mm.

  The cutting edge 6a is fixed to the upper tool main body 2 so as to protrude several mm in a direction in contact with the workpiece. Although the fixing method is not shown, the cutting blade 6a is brazed to the inner surface outer edge 2a or the outer peripheral surface 2b of the upper tool body 2 and fixed with screws or the like. Further, as shown in FIG. 1, notches 2c are formed at predetermined intervals on the inner surface outer edge 2a or outer peripheral surface 2b of the upper tool body 2, and a cartridge 6 having a cutting edge 6a is fixed to the notch 2c with a screw or the like. May be. Accordingly, the cutting blade 6a can be replaced by replacing the cartridge 6. Similarly to the cutting edge 6a, the interval between the notches 2c is set at an angle formed by the center of the axis and the notches 2c and 2c. When the upper tool body 2 has an outer diameter of about 200 mm, it is 10 to 45. ° is preferred.

  The upper tool body 2 is preferably made of aluminum or an aluminum alloy, and more preferably a JIS-defined 7000 series alloy. As a result, the surface processing tool 1A is reduced in weight, the dynamic balance is improved, and there is no chattering of the processing surface, chipping of the cutting edge 6a, etc. during surface processing, and the surface processing tool 1A is mounted. There is no adverse effect on the rotating shaft.

(Spacer)
The spacer 5 has a cylindrical shape, and the upper tool body 2 is joined to one end thereof by welding, brazing or the like, and the lower tool body 4 is welded to the other end in parallel with the upper tool body 2. Are joined by brazing or the like. And the spacer 5 prescribes | regulates the distance between the upper tool main-body part 2 (inner surface outer edge 2a) and the lower tool main-body part 4 (inner surface outer edge 4a), and is the length match | combined with the processing dimension of the workpiece. That is, it has the same length as the set thickness of the workpiece (product). Thus, by setting the length of the spacer (distance between the tool body parts), the processing amount of the work piece is adjusted, and high processing accuracy (thickness accuracy ± 0.2 mm) is obtained. Will also be excellent.

  The outer diameter of the spacer 5 is preferably 15 to 40% of the outer diameter of the upper tool body 2. If it is less than 15%, the strength and dynamic balance of the surface machining tool 1A tend to be lowered. On the other hand, if it exceeds 40%, the space for moving the surface machining tool 1A or the workpiece during machining becomes small, and the productivity tends to decrease. In addition, the cross-sectional shape in the axis orthogonal cross section of the spacer 5 is not limited to a circular shape, and may be a polygonal shape.

  The spacer 5 is made of the same material as the upper tool main body 2 and the lower tool main body 4 from the viewpoint of weight reduction and dynamic balance of the surface machining tool 1A, and bonding properties to the upper tool main body 2 and the lower tool main body 4. It is preferable to be made of aluminum or an aluminum alloy.

(Lower tool body)
The lower tool body 4 has the same configuration as the upper tool body 2 except that the mounting portion 3 is not provided. That is, the lower tool body 4 has a cylindrical shape and is joined to the spacer 5 so as to be parallel to the upper tool body 2. Thereby, the lower tool body 4 is arranged to face the upper tool body 2 through the spacer 5.

A plurality of cutting blades 6a (notches 4c) are arranged at predetermined intervals on the inner surface outer edge 4a or the outer peripheral surface 4b of the lower tool body 4 facing the upper tool body 2. In addition, it is preferable that arrangement | positioning of the cutting blade 6a (cutout part 4c) is the same as arrangement | positioning of the cutting blade 6a (cutout part 2c) arrange | positioned at the upper tool main-body part 2 from a viewpoint of the dynamic balance of the surface processing tool 1A. However, it is not limited to the same arrangement, and may be shifted by a predetermined angle in the circumferential direction of the lower tool body 4.
The outer diameter and material of the lower tool body 4 and the cutting edge 6a (notch 4c) are the same as those of the upper tool body 2.

<Processing method>
Next, an embodiment of the processing method of the present invention will be described with reference to the drawings. 3 is a side view showing the outline of the surface machining method, FIG. 4A is a perspective view showing the outline of the hole machining method, FIG. 3B is a plan view of FIG. 5A, and FIG. The perspective view which shows the outline | summary of another form, (b) is (a) top view, FIG.6 (a) is the perspective view which shows the outline | summary of the other form of the hole processing method, (b) is (a) top view. is there.

  The processing method of the present invention includes a first step of performing surface processing on a workpiece and a second step of performing hole processing on the surface processed workpiece. Alternatively, a machining method may be used in which hole machining is performed as the first step and surface machining is performed as the second step. Hereinafter, surface processing and hole processing will be described in detail.

(Surface processing)
As shown in FIG. 3, by using the surface processing tool 1 </ b> A described above, surface processing is performed on a workpiece (bush portion 11 or ball joint portion 13) or a hole-machined workpiece described later according to the following procedure. Do.

(1) The mounting portion 3 of the surface processing tool 1A is fitted into a jig (not shown) mounted on the rotating shaft of the processing machine, and the surface processing tool 1A is mounted on the rotating shaft of the processing machine. Further, the workpiece is set on a table (not shown) of the processing machine. Then, the table is moved in the horizontal and / or vertical direction so that the workpiece is positioned between the upper tool body 2 and the lower tool body 4 of the surface machining tool 1A. Instead of moving the table, the surface processing tool 1A (rotating shaft of the processing machine) may be moved.

(2) The surface machining tool 1A is rotated by driving the processing machine, and the surface machining tool 1A is moved to the workpiece side so that the workpiece moves between the upper tool body 2 and the lower tool body 4. By horizontally moving the workpiece at a predetermined speed, both surfaces of the workpiece are simultaneously machined. Thereby, processing accuracy and productivity are improved. Note that the table (workpiece) may be moved instead of the movement of the surface machining tool 1A.
It should be noted that the same procedure as described above is performed when surface machining is performed on a hole-machined workpiece.

(Drilling)
As shown in FIGS. 4 (a) and 4 (b), using a drilling tool 1B called a so-called end mill having cutting edges on the outer peripheral surface and the front end surface, the workpiece or It is preferable to form a processing hole having a predetermined inner diameter (D) at a predetermined position of the surface processed workpiece. As the hole machining tool 1B, a tool having an outer diameter (d) smaller than the inner diameter (D) of the formed hole is used.

(1) The hole machining tool 1B is fitted into a jig (not shown) mounted on the rotating shaft of the processing machine, and the hole machining tool 1B is mounted on the rotating shaft of the processing machine. Further, the workpiece is set on a table (not shown) of the processing machine. Then, the table is moved in the horizontal and / or vertical direction, and the hole machining tool 1B is positioned at a predetermined position (position where a machining hole is formed) on the machining surface of the workpiece. Instead of moving the table, the hole drilling tool 1B (rotating shaft of the processing machine) may be moved.

(2a) The drilling tool 1B is rotated by driving the processing machine, and the drilling tool 1B is sent in the thickness direction of the workpiece by a spiral track of (inner diameter (D) −outer diameter (d)). A hole is drilled at a predetermined position of the object. Thereby, processing accuracy and productivity are improved.

  The outer diameter (d) of the hole machining tool 1B is more preferably 60 to 85% of the inner diameter (D) of the formed hole. When the outer diameter (d) is less than 60%, the rigidity of the tool is liable to be lowered, and the machining waste at the time of drilling is easily entangled with the hole machining tool 1B, so that the machining accuracy and productivity are likely to be lowered. On the other hand, if the outer diameter (d) exceeds 85%, the frictional resistance at the time of drilling tends to increase, and the processing accuracy and productivity tend to decrease.

As shown in FIGS. 5A and 5B, the procedure (2a) of drilling may be performed by the following procedure (2b).
(2b) The drilling tool 1B is rotated by driving the processing machine, and the drilling tool 1B is sent along a circular path of (inner diameter (D) −outer diameter (d)) to the processing surface of the workpiece, By feeding in a stepwise manner in the thickness direction of the workpiece, hole machining is performed at a predetermined position of the workpiece.

More specifically,
(2b-1) A hole having an inner diameter (d) is formed in the region D1 by feeding a predetermined amount of the hole machining tool 1B in the thickness direction of the workpiece. Subsequently, the feed of the hole drilling tool 1B in the thickness direction is stopped, and the hole drilling tool 1B is rotated once in a circular path of (inner diameter (D) −outer diameter (d)) with respect to the processing surface of the workpiece. By processing, a processing hole having an inner diameter (D) is formed in the region D1.

(2b-2) Next, the hole machining tool 1B is fed by a predetermined amount in the thickness direction of the workpiece, thereby forming a machining hole having an inner diameter (d) in the region D2. Subsequently, the feed of the hole drilling tool 1B in the thickness direction is stopped, and the hole drilling tool 1B is rotated once in a circular path of (inner diameter (D) −outer diameter (d)) with respect to the processing surface of the workpiece. By processing, a processing hole having an inner diameter (D) is formed in the region D2.

(2b-3) By forming a processing hole having an inner diameter (D) in the regions D3 and D4 in the same procedure, a processing hole having an inner diameter (D) penetrating in the thickness direction is formed at a predetermined position of the workpiece. .

  In addition, it is preferable that the outer diameter (d) of the drilling tool 1B used in the procedure (2b) is 60 to 85% of the inner diameter (D) of the drilled hole to be formed. The reason for limiting the numerical range of the outer diameter (d) is the same as in the procedure (2a).

As shown in FIGS. 6A and 6B, the procedure (2a) for drilling may be performed by the following procedure (2c).
(2c) The drilling tool 1B is rotated by driving the processing machine, and the drilling tool 1B is sent by a spiral track having a maximum diameter of (inner diameter (D) −outer diameter (d)) with respect to the processing surface of the workpiece. At the same time, a hole is drilled at a predetermined position of the workpiece by sending it stepwise in the thickness direction of the workpiece.

More specifically,
(2c-1) A hole having an inner diameter (d) is formed in the region D1 by feeding a predetermined amount of the hole machining tool 1B in the thickness direction of the workpiece. Subsequently, the movement of the hole drilling tool 1B in the thickness direction is stopped, and the hole drilling tool 1B is a spiral track having the maximum diameter (inner diameter (D) −outer diameter (d)) with respect to the processing surface of the workpiece. In this case, a processing hole having an inner diameter (D) is formed in the region D1.

(2c-2) Next, the hole machining tool 1B is fed by a predetermined amount in the thickness direction of the workpiece, thereby forming a machining hole having an inner diameter (d) in the region D2. Subsequently, the movement of the hole drilling tool 1B in the thickness direction is stopped, and the hole drilling tool 1B is a spiral track having the maximum diameter (inner diameter (D) −outer diameter (d)) with respect to the processing surface of the workpiece. To form a processing hole having an inner diameter (D) in the region D2.

(2c-3) By forming a processing hole having an inner diameter (D) in the regions D3 and D4 in the same procedure, a processing hole having an inner diameter (D) penetrating in the thickness direction is formed at a predetermined position of the workpiece. .

  In addition, it is preferable that the outer diameter (d) of the hole drilling tool 1B used in the procedure (2c) is less than 60% of the inner diameter (D) of the hole to be formed. When the outer diameter (d) of the drilling tool 1B is 60% or more, the frictional resistance at the time of drilling is increased, and the processing accuracy and productivity are likely to be lowered.

Further, when drilling a surface processed workpiece, the same procedure as the procedure (2a), the procedure (2b) or the procedure (2c) described above is performed.
Further, in the drilling of the present invention, as shown in FIGS. 9 (a) to 9 (c), a pilot hole is drilled with a small-diameter drill 40, and subsequently, the pilot hole is drilled with a large-diameter drill 41 or a boring bar 42. You may carry out by the conventional method which performs hole processing.
Further, a machining center capable of setting a plurality of tools may be used as a processing machine. Thereby, the surface processing and hole processing can be performed efficiently.

As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment, You may change suitably in the range which does not deviate from the claim of this invention.
For example, as a surface machining tool, means for vertically moving the upper tool body and the lower tool body on the spacer axis are provided at both ends of the spacer, and the upper tool body or / and the lower side are provided during surface machining. It may be possible to adjust the distance between the tool body parts to the set thickness of the workpiece (product) by appropriately moving the tool body part up and down. Further, it may be possible to prepare several kinds of spacers having different lengths and appropriately replace them during surface processing depending on the set thickness of the workpiece (product). Further, the spacer, the upper tool main body, and the lower tool main body may be produced as an integrated object.

It is a perspective view which shows the structure of the surface processing tool which concerns on this invention. It is a top view of a suspension arm. It is a side view which shows the outline | summary of the surface processing method which concerns on this invention. (A) is a perspective view which shows the outline | summary of the hole processing method, (b) is a top view of (a). (A) is a perspective view which shows the outline | summary of the other form of the hole processing method, (b) is (a) top view. (A) is a perspective view which shows the outline | summary of the other form of the hole processing method, (b) is (a) top view. (A) The perspective view which shows the structure of the conventional surface processing tool, (b) is a side view which shows the outline | summary of the surface processing method using the tool of (a). (A) The perspective view which shows the other structure of the conventional surface processing tool, (b) is a top view which shows the outline | summary of the surface processing method using the tool of (a). (A)-(c) is a perspective view which shows the outline | summary of the conventional drilling method.

Explanation of symbols

1A Surface machining tool 1B Hole machining tool 2 Upper tool body 2a, 4a Inner outer edge 2b, 4b Outer peripheral surface 3 Mounting portion 4 Lower tool body 5 Spacer 6a Cutting edge d Outer diameter D Inner diameter

Claims (6)

A surface processing tool that is mounted on a rotating shaft of a processing machine and simultaneously processes both surfaces of a workpiece,
A cylindrical upper tool body provided with a mounting portion to be mounted on the rotating shaft;
A spacer joined to the upper tool body on the opposite side of the mounting part and having a length according to the processing dimension of the workpiece;
A columnar lower tool body joined to the spacer so as to be parallel to the upper tool body,
A plurality of cutting blades are arranged at predetermined intervals on the outer peripheral surfaces of the inner surfaces of the upper tool body and the lower tool body, or on the outer peripheral surfaces of the upper tool body and the lower tool body, respectively. A surface machining tool characterized by that. A first step of performing surface machining on the workpiece using the surface machining tool according to claim 1;
And a second step of drilling the workpiece surface-finished in the first step. A first step of drilling a workpiece;
A processing method comprising: a second step of performing surface processing using the surface processing tool according to claim 1 on the workpiece drilled in the first step. The hole processing is to form a processing hole having a predetermined inner diameter (D) using a hole processing tool having a cutting edge on the outer peripheral surface and the tip surface,
The outer diameter (d) of the hole machining tool is smaller than the inner diameter (D) of the machining hole, and the hole machining tool is moved in the thickness direction of the workpiece on a spiral track of (inner diameter (D) −outer diameter (d)). The processing method according to claim 2, wherein the processing method is sent to: The hole processing is to form a processing hole having a predetermined inner diameter (D) using a hole processing tool having a cutting edge on the outer peripheral surface and the tip surface,
The outer diameter (d) of the hole drilling tool is smaller than the inner diameter (D) of the hole, and the hole drilling tool is (inner diameter (D) -outer diameter (d)) with respect to the machining surface of the workpiece. The processing method according to claim 2, wherein the processing method is sent in a circular orbit and stepwise in the thickness direction of the workpiece. The hole processing is to form a processing hole having a predetermined inner diameter (D) using a hole processing tool having a cutting edge on the outer peripheral surface and the tip surface,
The outer diameter (d) of the hole drilling tool is smaller than the inner diameter (D) of the hole, and the hole drilling tool is (inner diameter (D) -outer diameter (d)) with respect to the machining surface of the workpiece. 4. The processing method according to claim 2, wherein the workpiece is fed in a spiral orbit having a maximum diameter and is sent stepwise in the thickness direction of the workpiece.

Images