Cutting machine

Abstract

This cutting machine (10) is provided with an air supply mechanism (141). The air supply mechanism (141) feeds air into the interior of a jig (26) from a support block (28). The air supply mechanism (141) comprises: an air supply flow passage (140) provided to the support block (28); an air flow passage (82) provided to the jig (26); and a switching valve (68) provided to the air flow passage (82). Before the switching valve (68) is opened during a process of an operation for connecting the jig (26) and the support block (28), a discharge passage (76) is brought into communication with a space enclosed by a first reference seat (64) of the jig (26), a connection part (138) of the support block (28), and the switching valve (68).

Description

[Technical field]

[0001] The present invention relates to a cutting machine that uses cutting tools to machine a workpiece. [Background technology]

[0002] The present applicant has proposed a cutting machine used for boring (see Japanese Patent Publication No. 5-2442). This cutting machine processes bearing holes in the workpieces, that is, the cylinder block and the cylinder head.

[0003] The cutting machine includes a support, a drive mechanism, a feed mechanism, four tool heads, four boring bars, four support jigs, an index mechanism, a workpiece support mechanism, and a transport mechanism.

[0004] The support pillar is erected on a base. A processing station is installed on the base. A drive mechanism is arranged so as to be able to rise and fall at a position corresponding to the processing station. The drive mechanism and the tool head are raised and lowered along the support pillar by a feed mechanism. The boring bar is detachably connected to each tool head. The boring bar extends downward from the tool head. The support jig is arranged at a position corresponding to the processing station. The support jig is fixed to the lower part of the support pillar. The four tool heads, four boring bars, and four support jigs are arranged so as to be switchable by an index mechanism.

[0005] In this cutting machine, an index mechanism switches and positions a tool head, boring bar, and support jig according to the type of workpiece at the processing station. A transport mechanism transports the workpiece to a position corresponding to the processing station and holds it with the support jig. The motor of the feed mechanism is driven to lower the drive mechanism, tool head, and boring bar along the support. The drive mechanism drives the boring bar to rotate and insert it into the bearing hole of the workpiece. The boring bar's cutting tool processes the bearing hole of the workpiece. After processing of the bearing hole of the workpiece is completed, the feed mechanism is driven to raise the boring bar. After the support jig releases the workpiece from its hold on the workpiece, the transport mechanism removes the workpiece from the processing station.

[0006] In the series of machining operations by the cutting machine, the cutting tool of the boring bar and the machining part of the workpiece generate heat. Therefore, when cutting a workpiece with the cutting machine, the cutting tool is generally cooled by applying coolant to the cutting tool in order to prevent a decrease in strength of the cutting tool due to heat generation or a decrease in machining accuracy due to deformation of the machined surface.

[0007] In addition, by applying coolant to the machining area of ​​the workpiece, the coolant simultaneously removes chips generated by the cutting process and cools the machining area. The coolant also has the function of cleaning the cutting surface so that chips generated by the cutting process do not adhere to the cutting tool or the machined surface of the workpiece. Summary of the Invention

[0008] However, there is a concern that when a cutting machine cuts a workpiece, chips swept away by the coolant may enter gaps in the rotation mechanism of the boring bar and impede the rotation of the boring bar. Therefore, it is necessary to prevent the chips from entering the bearing portion that rotatably holds the boring bar, or to prevent the coolant containing the chips from entering the bearing portion.

[0009] In addition, when the bearing part rotates together with the boring bar, the bearing part itself also generates heat due to friction. Therefore, in order to smoothly rotate and stably support the boring bar, a cooling means is required for the bearing part to which coolant cannot be applied. For example, a cooling means capable of cooling the bearing part by supplying air is conceivable. However, when the tool heads or support jigs are separated and connected in order to automatically switch between the four tool heads or support jigs according to the workpiece or the machining part of the workpiece, there is a concern that the coolant or chips may be caught in between, causing the connection of the tool heads or support jigs to be incomplete, or that the chips or coolant may enter the air passage for supplying air.

[0010] The present invention aims to solve the above-mentioned problems.

[0011] An aspect of the present invention is a cutting machine including a processing machine body having a drive mechanism for rotating a tool for cutting a workpiece, and a jig that is detachable from the processing machine body and configured to hold the workpiece, The processing machine body is a main body frame in which the drive mechanism is disposed; a support block that detachably supports the jig and has a connection portion that is connected to a connected portion of the jig, the support block being disposed on the main body frame; an air supply mechanism for supplying air from the support block to an inside of the jig; Equipped with the air supply mechanism includes a first air flow path that is disposed in the support block and opens to the connection portion, and through which air is supplied from an air supply source; a second air flow path disposed on the jig and opening to the connected portion; a switching valve disposed in the jig that is disposed in the second air flow path, and that is opened by being pressed by the connecting portion when the connecting portion and the connected portion are connected to each other, thereby communicating the first air flow path and the second air flow path; having A discharge passage is disposed in at least one of the connecting portion and the connected portion, The discharge passage communicates with a space surrounded by the connected portion, the connecting portion, and the switching valve before the switching valve opens during the process of connecting the connected portion and the connecting portion.

[0012] According to the present invention, the following effects can be obtained.

[0013] That is, when the connecting portion of the support block and the connected portion of the jig are connected, the switching valve is pushed by the connecting portion to open, so that air can be supplied from the first air flow path of the support block to the second air flow path of the jig. Before the switching valve opens during the process of connecting the connected portion and the connecting portion, the space surrounded by the connected portion, the connecting portion, and the switching valve communicates with the exhaust passage. At this time, since a switching valve is not disposed in the connecting portion, air is supplied from the first air flow path to the space surrounded by the connected portion, the connecting portion, and the switching valve.

[0014] As a result, when liquid enters the first air flow path or liquid accumulates near the contact portion between the connected part and the connecting part, the liquid can be pushed out by the air supplied to the first air flow path and reliably discharged to the outside through the discharge passage, thereby reliably preventing liquid in the first air flow path from entering the second air flow path of the jig. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an external perspective view of a cutting machine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged perspective view of a main portion of the cutting machine of FIG. [Diagram 3] FIG. 3 is an external perspective view of the jig in the cutting machine of FIG. 2, as viewed from the rear. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 5 is an enlarged cross-sectional view showing a state in the middle of connecting the jig and the support block. [Figure 6]FIG. 6 is a cross-sectional view showing a state in the middle of connection where the jig and the support block in FIG. 5 are brought even closer to each other. [Figure 7] 7 is a schematic side view of the jig and support block of the cutting machine shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The cutting machine 10 is used to perform hole drilling on a workpiece W. The workpiece W is a cylinder block or cylinder head of an internal combustion engine mounted on a vehicle. As shown in Figs. 1 and 2, the cutting machine 10 includes a base 12, a main body frame 14, a processing station 16, a drive mechanism 18, a feed mechanism 20, four tool heads 22, a tool 24, a jig 26, a support block 28, and a transport mechanism 30. The base 12, the main body frame 14, the processing station 16, the drive mechanism 18, the feed mechanism 20, the tool heads 22, the tool 24, the support block 28, and the transport mechanism 30 constitute a processing machine main body 31.

[0017] The base 12 is disposed at the bottom of the cutting machine 10. The base 12 extends horizontally. The base 12 is placed on a floor surface or the like. The base 12 includes a first base 32 and a second base 34. The main body frame 14 is connected to an upper portion of the first base 32. The second base 34 is adjacent to the first base 32. A transport mechanism 30, which will be described later, is disposed at an upper portion of the second base 34.

[0018] The main body frame 14 stands upward from an upper portion of the first base 32 of the base 12. The cross-sectional shape of the main body frame 14 is substantially circular when viewed from the top-bottom direction. The main body frame 14 includes an accommodation space 36 and a guide rail 38.

[0019] The accommodation space 36 opens to the outer peripheral surface of the main body frame 14. The accommodation space 36 faces the processing station 16 and the transport mechanism 30, which will be described later. The accommodation space 36 has a rectangular shape that is elongated in the axial direction of the main body frame 14. A support block 28, which will be described later, is accommodated inside the accommodation space 36.

[0020] The guide rails 38 are disposed on the outer circumferential surface of the main body frame 14. The guide rails 38 are disposed in an upper portion of the accommodation space 36. The guide rails 38 extend along the axial direction of the main body frame 14.

[0021] The processing station 16 is a location where the workpiece W is processed. The processing station 16 is disposed to the side of the main body frame 14. The processing station 16 faces the lower part of the main body frame 14. The processing station 16 is disposed between the main body frame 14 and the transport mechanism 30. The workpiece W is carried in and out of the processing station 16 by the transport mechanism 30.

[0022] The drive mechanism 18 is disposed on the upper part of the main body frame 14. A part of the drive mechanism 18 protrudes radially outward from the main body frame 14. The drive mechanism 18 is disposed above the processing station 16. The drive mechanism 18 and the processing station 16 face each other in the vertical direction. The drive mechanism 18 includes a lift table 40 and a drive motor 42.

[0023] The lifting platform 40 is disposed horizontally and perpendicular to the axis of the main body frame 14. The lifting platform 40 is movable along the guide rails 38 of the main body frame 14. The drive motor 42 is fixed to the upper part of the lifting platform 40. The drive motor 42 has a drive shaft (not shown). The drive shaft passes through the lifting platform 40 and extends downward. A rotating shaft 48 of the tool head 22 is connected to the lower end of the drive shaft. When electricity is applied to the drive motor 42 from a power source (not shown), the rotating shaft 48 rotates together with the drive shaft.

[0024] The feed mechanism 20 is capable of moving the drive mechanism 18, which includes the lift platform 40, in the vertical direction. The feed mechanism 20 is disposed on the upper part of the main body frame 14. The feed mechanism 20 includes a lift motor 44. By driving the lift motor 44, the lift platform 40 moves in the vertical direction along the guide rail 38.

[0025] The four tool heads 22 are arranged on the outer periphery of the main body frame 14. The four tool heads 22 are held by a head carrier 46. The head carrier 46 is annular. The head carrier 46 is arranged radially outward from the outer periphery of the main body frame 14. The head carrier 46 is rotatably arranged on the main body frame 14. The four tool heads 22 are arranged at equal intervals in the circumferential direction of the head carrier 46. When viewed in the axial direction of the head carrier 46, the four tool heads 22 are spaced apart from one another by 90°.

[0026] When the head carrier 46 rotates due to the driving force of a driving source (not shown), the four tool heads 22 rotate around the main body frame 14. The four tool heads 22 rotate along the outer circumferential surface of the main body frame 14, and one of the four tool heads 22 is disposed at a position facing the processing station 16.

[0027] Each tool head 22 includes a rotating shaft 48. The rotating shaft 48 is rotatably supported by the tool head 22. The rotating shaft 48 extends downward from the tool head 22. The upper end of the rotating shaft 48 is connected to the lower end of the drive shaft of the drive motor 42 in the drive mechanism 18. The lower end of the rotating shaft 48 is coupled to the upper end of the tool 24 via a joint (not shown).

[0028] The tool 24 is detachably arranged on the tool head 22. The tool 24 is a long shaft body along the axial direction. The tool 24 extends downward from the tool head 22. In this embodiment, the tool 24 is a boring bar. The tool 24 includes a plurality of cutting tools (blade tools) 50. The cutting tools 50 are shaft bodies having cutting portions at their tips. The cutting tools 50 are arranged in a direction perpendicular to the axis of the tool 24.

[0029] The cutting tool 50 is inserted into the tool 24. The tip of the cutting tool 50 protrudes radially outward from the outer circumferential surface of the tool 24. The multiple cutting tools 50 are arranged at equal intervals along the axial direction of the tool 24. The tip of the cutting tool 50 cuts the inner circumferential surface of a pilot hole H (see FIG. 2) in the workpiece W.

[0030] An upper end of the tool 24 can be connected to a lower end of the rotating shaft 48. When the drive motor 42 rotates, the tool 24 rotates together with the rotating shaft 48. The lower end of the tool 24 can be inserted into a second bearing 124 of a second bearing portion 58 in the jig 26, which will be described later.

[0031] The four jigs 26 are capable of holding the workpiece W. The jigs 26 are held by support carriers 52. The jigs 26 are disposed at the same height as the support blocks 28 in the axial direction of the main body frame 14 by the pair of support carriers 52. The support carriers 52 are annular. The support carriers 52 are rotatably disposed on the outer periphery of the main body frame 14. The four jigs 26 are held by the support carriers 52 at equal intervals in the circumferential direction of the support carrier 52. When viewed in the axial direction of the support carrier 52, the four jigs 26 are spaced apart from one another at 90° intervals.

[0032] The four jigs 26 are capable of rotating around the outer periphery of the main body frame 14 by the support carrier 52. When one of the four jigs 26 faces the processing station 16, the one jig 26 faces the support block 28.

[0033] As shown in Fig. 1 to Fig. 3, the jig 26 includes a jig body 54, first and second bearing parts 56, 58, and a drain discharge mechanism 60. The cross-sectional shape of the jig 26 is a U-shape in which the first and second bearing parts 56, 58 and the jig body 54 are substantially perpendicular to each other. The cross-sectional shape of the jig 26 opens in a direction away from the support carrier 52. The workpiece W is held so as to be surrounded by the jig body 54 and the first and second bearing parts 56, 58 (see Figs. 1 and 2).

[0034] The jig body 54 is in the form of a flat plate. The jig body 54 faces the body frame 14 or the support block 28. The jig body 54 is in the form of a generally rectangular shape that is straight in the vertical direction. A drain passage 62 is provided inside the jig body 54. The upstream end of the drain passage 62 is connected to a drain tank 126 of the drain discharge mechanism 60, which will be described later.

[0035] The jig body 54 has a back surface 541. The back surface 541 faces the main body frame 14. The back surface 541 of the jig body 54 is flat along the up-down direction and the width direction of the jig body 54. The back surface 541 of the jig body 54 has a recess 78 (see FIG. 4). The recess 78 is recessed from the back surface 541. The cross-sectional shape of the recess 78 is circular. An air flow path 82 is connected to the bottom of the recess 78. The air flow path 82 extends inside the jig body 54 to the second bearing portion 58, which will be described later. Air can be supplied to the second bearing 124 of the second bearing portion 58 through the air flow path 82.

[0036] A pair of first reference seats (connected portions) 64, a pair of second reference seats (connected portions) 66, and a switching valve 68 are attached to the back surface 541 of the jig body 54. A connection portion 138 of a support block 28, which will be described later, abuts against the first and second reference seats 64, 66.

[0037] The pair of first reference seats 64 are attached near the upper end of the jig body 54. One first reference seat 64 and the other first reference seat 64 are spaced apart in the width direction of the jig body 54 perpendicular to the up-down direction.

[0038] As shown in Figs. 3 to 6, the first reference seat 64 includes a first body portion 70, an insertion portion 72, and a through hole 74. The first body portion 70 is disk-shaped. A back surface 701 of the first body portion 70 is flat along the up-down direction and the width direction of the jig body 54. The first body portion 70 has a predetermined thickness in the axial direction of the first reference seat 64. The first body portion 70 abuts against the back surface 541 of the jig body 54. The first body portion 70 protrudes beyond the back surface 541 of the jig body 54 by the thickness of the first body portion 70.

[0039] The first main body portion 70 includes a discharge passage 76. The discharge passage 76 extends downward from the through hole 74 of the first main body portion 70. The discharge passage 76 opens to the outer edge portion of the first main body portion 70. The through hole 74 and the outside of the first main body portion 70 are connected by the discharge passage 76. Note that the discharge passage 76 is not limited to extending downward.

[0040] The insertion portion 72 is cylindrical. The insertion portion 72 is disposed at the center of the first main body portion 70. When viewed from the axial direction of the first reference seat 64, the cross-sectional shape of the insertion portion 72 is circular. The insertion portion 72 protrudes in the opposite direction to the back surface 701 of the first main body portion 70. The insertion portion 72 is inserted into a recess 78 of the jig body 54.

[0041] The first body portion 70 abuts against the back surface 541 of the jig body 54, and the insertion portion 72 is inserted into the recess 78. The first body portion 70 is fixed to the back surface 541 of the jig body 54 by the bolt 80. As a result, the first reference seat 64 is attached to the back surface 541 of the jig body 54.

[0042] Air can flow through the through hole 74. When the jig 26 and the support block 28 are connected, air is supplied to the through hole 74 through the support block 28. The through hole 74 is connected to an air flow path (second air flow path) 82 of the jig body 54. The through hole 74 is disposed at the center of the first reference seat 64. The through hole 74 penetrates the first reference seat 64 along the axial direction. The through hole 74 includes a connection port 84 and a valve accommodating portion 86. The connection port 84 opens to the rear surface 701 of the first main body portion 70. The connection port 84 extends from the first main body portion 70 to the insertion portion 72. The connection port 84 has a substantially constant diameter. A connection portion 138 of the support block 28, which will be described later, can be inserted into the connection port 84.

[0043] The valve accommodating portion 86 is disposed inside the insertion portion 72. The valve accommodating portion 86 opens to an end portion of the insertion portion 72. The valve accommodating portion 86 accommodates the switching valve 68. The valve accommodating portion 86 includes a seal ring 87. The seal ring 87 is held on an inner circumferential surface of the insertion portion 72. The seal ring 87 is in sliding contact with a piston 96 of the switching valve 68, which will be described later.

[0044] The discharge passage 76 is connected to the connection port 84. The extending direction of the connection port 84 and the extending direction of the discharge passage 76 are substantially perpendicular to each other. The through hole 74 (connection port 84) and the discharge passage 76 communicate with each other.

[0045] 3 and 7, the pair of second reference seats 66 are attached near the lower end of the jig body 54. One second reference seat 66 and the other second reference seat 66 are spaced apart in the width direction of the jig body 54 perpendicular to the up-down direction.

[0046] The second reference seat 66 includes a second main body portion 88, an insertion portion 72, and a through hole 74. Since the second reference seat 66 has substantially the same configuration as the first reference seat 64, the same components are given the same reference symbols and detailed descriptions thereof are omitted.

[0047] The second main body portion 88 has a drain discharge hole 90. The drain discharge hole 90 penetrates the second main body portion 88. The drain discharge hole 90 opens to a back surface (end surface) 881 of the second main body portion 88. The drain discharge hole 90 is disposed below the through hole 74. The drain discharge hole 90 communicates with a drain passage 62 of the jig main body 54. As a result, liquid (coolant) stored in a drain tank 126 of the drain discharge mechanism 60 described later flows through the drain passage 62 to the drain discharge hole 90 and is discharged to the outside.

[0048] The switching valve 68 can switch the air flow state in the through hole 74. The switching valve 68 is accommodated in a recess 78 of the jig body 54. A portion of the switching valve 68 is accommodated and held in the insertion portions 72 of the first and second reference seats 64, 66. The switching valve 68 faces the first and second reference seats 64, 66.

[0049] The switching valve 68 includes a holder 92, a rod 94, a piston (valve body) 96, and a spring (biasing member) 98.

[0050] The holder 92 includes a flange portion 100 and a cylindrical portion 102. The flange portion 100 is disk-shaped. The flange portion 100 abuts against the bottom of the recess 78. The cylindrical portion 102 extends from the center of the flange portion 100 toward the first and second reference seats 64, 66. The cylindrical portion 102 is inserted into the valve accommodating portion 86. A communication passage 104 is provided inside the cylindrical portion 102. The communication passage 104 extends along the axial direction of the cylindrical portion 102. The communication passage 104 and the air flow path 82 of the jig body 54 communicate with each other through a plurality of holes 106 opening in the flange portion 100. A rod 94 is disposed inside the cylindrical portion 102.

[0051] The rod 94 is a shaft body having a predetermined length in the axial direction. The rod 94 is disposed at the axial center of the holder 92. One axial end of the rod 94 is fixed to the flange portion 100. The other axial end of the rod 94 is inserted into the valve accommodating portion 86. The rod 94 has a shaft portion 95, a valve portion 108, and a communication portion 110. The shaft portion 95 extends from one axial end of the rod 94 to the vicinity of the other end. The valve portion 108 has approximately the same diameter as one end of the shaft portion 95.

[0052] The valve portion 108 is disposed at the other axial end of the shaft portion 95. The valve portion 108 is capable of closing a port 116 of the piston 96, which will be described later. The outer periphery of the valve portion 108 has an inclined surface 109. The inclined surface 109 increases in diameter from the valve portion 108 towards the shaft portion 95. The communicating portion 110 is disposed in the shaft portion 95. The communicating portion 110 is disposed closer to one end of the rod 94 than the valve portion 108. The communicating portion 110 has a smaller diameter than the valve portion 108.

[0053] The piston 96 is movably accommodated in the valve accommodating portion 86. The cross-sectional shape of the piston 96 is U-shaped. The piston 96 has an end wall portion 112 and a peripheral wall portion 114. The end wall portion 112 is flat and perpendicular to the axis of the piston 96. The end wall portion 112 is arranged in a direction toward the first and second reference seats 64, 66. The end wall portion 112 faces the connection port 84 of the through hole 74. A port 116 opens in the center of the end wall portion 112. The port 116 penetrates the end wall portion 112. The communication portion 110 of the rod 94 is inserted into the port 116. The valve portion 108 of the rod 94 is arranged at a position closer to the first and second reference seats 64, 66 than the end wall portion 112 (port 116).

[0054] The peripheral wall portion 114 is cylindrical. The peripheral wall portion 114 extends from the outer edge of the end wall portion 112 toward the flange portion 100. The peripheral wall portion 114 is disposed on the outer periphery of the tube portion 102 of the holder 92. The peripheral wall portion 114 is in sliding contact with the seal rings 87 of the first and second reference seats 64, 66. An annular space 97 is provided radially outward of the peripheral wall portion 114. The annular space 97 and the discharge passage 76 communicate with each other.

[0055] The spring 98 is housed inside the cylindrical portion 102. The spring 98 is disposed between the flange portion 100 and an end wall portion 112 of the piston 96. The spring 98 biases the piston 96 in the axial direction away from the holder 92. The spring 98 presses the piston 96 toward the first and second reference seats 64, 66. When the piston 96 moves in the direction away from the holder 92 due to the elastic force of the spring 98, the port 116 comes into contact with the valve portion 108 of the rod 94. The port 116 is blocked by the valve portion 108, resulting in a valve-closed state (see FIGS. 5 and 6).

[0056] 1 to 3 and 7, the first bearing portion 56 is disposed at the upper end of the jig body 54. The second bearing portion 58 is disposed at the lower end of the jig body 54. The first and second bearing portions 56, 58 each protrude in a direction perpendicular to the extension direction of the jig body 54. The first and second bearing portions 56, 58 each extend in the opposite direction to the main body frame 14. The first bearing portion 56 and the second bearing portion 58 face each other in the vertical direction.

[0057] The first bearing portion 56 has a first support hole 118. The first support hole 118 penetrates in the up-down direction. When the tool 24 is lowered together with the tool head 22, a first bearing 120 that supports the tool 24 is inserted into the first support hole 118. The first bearing 120 is held by the first support hole 118 of the first bearing portion 56.

[0058] The second bearing portion 58 has a second support hole 122. A second bearing 124 is housed in the second support hole 122. When the tool 24 is lowered together with the tool head 22, the lower end of the tool 24 is inserted into the second support hole 122. The lower end of the tool 24 is rotatably supported by the second bearing 124. The interior of the second bearing portion 58 is in communication with the air flow path 82.

[0059] The drain discharge mechanism 60 is disposed midway through the air flow path 82. The drain discharge mechanism 60 removes liquid (coolant) contained in the air flowing through the air flow path 82. The drain discharge mechanism 60 includes a drain tank 126, first and second tubes 128, 130, and a drain tube 132. The drain tank 126 is hollow and has a drain chamber therein.

[0060] The drain tank 126 is attached to a width direction side of the jig body 54 (see FIGS. 3 and 7). The bottom of the drain tank 126 has a drain hole (discharge hole) 134. The drain hole 134 communicates with the outside of the drain tank 126. A drain tube 132 is connected to the drain hole 134. Liquid accumulated at the bottom of the drain tank 126 is discharged from the drain hole 134 to the drain tube 132. The drain tube 132 is connected to the drain passage 62 of the jig body 54.

[0061] The first tube 128 connects the air flow path 82 downstream of the switching valve 68 and the drain tank 126. The first tube 128 is connected to an upper portion of the drain tank 126. As a result, the air flowing through the air flow path 82 is supplied to the inside of the drain tank 126 through the first tube 128.

[0062] The second tube 130 connects the drain tank 126 and the air flow path 82 that communicates with the second bearing 124. The second tube 130 is connected to an upper portion of the drain tank 126. The second tube 130 is connected to the air flow path 82 downstream of the first tube 128. This allows air introduced into the drain tank 126 to be returned to the air flow path 82 through the second tube 130. The drain discharge mechanism 60 is disposed so as to bypass a portion of the air flow path 82.

[0063] When the air flowing through the air flow passage 82 passes through the drain tank 126, the liquid contained in the air is dripped downward inside the drain tank 126 by gravity. The liquid is stored in the bottom of the drain tank 126.

[0064] The support block 28 is accommodated in the accommodation space 36 of the main body frame 14 (see FIG. 1). The support block 28 is exposed to the outside of the main body frame 14 through an opening of the accommodation space 36. When the four jigs 26 rotate together with the support carrier 52, one of the four jigs 26 faces the support block 28. The one jig 26 facing the support block 28 can be held by the support block 28. The shape of the support block 28 corresponds to the jig body 54 of the jig 26. The support block 28 has a front surface 136. The front surface 136 is the surface facing the jig 26. The front surface 136 has four connection portions 138.

[0065] The connection parts 138 protrude from the front surface 136 toward the jig 26. The cross-sectional shape of the connection parts 138 is circular when viewed from the axial direction of the connection parts 138. Four connection parts 138 are arranged at positions corresponding to the first and second reference seats 64, 66 of the jig 26. That is, on the front surface 136 of the support block 28, two connection parts 138 are arranged near the upper end of the support block 28. Two connection parts 138 are arranged near the lower end of the support block 28. The connection parts 138 can be inserted into the connection port 84. The outer diameter of the connection parts 138 corresponds to the inner diameter of the connection port 84.

[0066] An air supply flow path (first air flow path) 140 is provided inside the connection part 138. The air supply flow path 140 opens at an end part of the connection part 138. The air supply flow path 140 is connected to an air supply source (not shown). Compressed air is supplied to the air supply flow path 140 from the air supply source.

[0067] When the support block 28 and the jig 26 face each other, the four connection portions 138 face the first and second reference seats 64, 66. When the support block 28 and the jig 26 are connected, the four connection portions 138 are inserted into the connection ports 84 of the first and second reference seats 64, 66, respectively. The front surface 136 of the support block 28 abuts against the rear surface 701 of the first reference seat 64 and the rear surface 881 of the second reference seat 66, respectively.

[0068] As a result, the front surface 136 of the support block 28 abuts against the rear surface 701 of the first reference seat 64 and the rear surface 881 of the second reference seat 66, thereby positioning the support block 28 and the jig 26 at predetermined positions. The air supply passage 140 of the support block 28 communicates with the connection ports 84 of the first and second reference seats 64, 66 of the jig 26. Air is supplied from the air supply passage 140 to the connection port 84.

[0069] When the support block 28 abuts against the first and second reference seats 64, 66, the piston 96 is pressed toward the holder 92 by a tip surface 139 of the connection portion 138. The tip surface 139 is annular. The entire circumference of the tip surface 139 can abut against the piston 96. When the piston 96 moves toward the holder 92, the end wall portion 112 moves away from the valve portion 108. The valve portion 108 moves away from the port 116, opening the port 116. This allows communication between the air supply flow path 140 of the connection portion 138 and the communication path 104 of the holder 92.

[0070] The support block 28 and the jig 26 are equipped with an air supply mechanism 141. The air supply mechanism 141 is equipped with an air supply flow path 140 of the support block 28, an air flow path 82 of the jig 26, and a switching valve 68 arranged at an opening of the jig 26. When the support block 28 and the jig 26 are connected, the switching valve 68 is opened by the connection part 138, and air can be supplied from the air supply flow path 140 to the air flow path 82.

[0071] 1, the transfer mechanism 30 is disposed on the second base 34 of the base 12. The transfer mechanism 30 faces the processing station 16. The transfer mechanism 30 includes a moving table 142, a cylinder 144, a workpiece holder 146, a pallet 148, and a pallet holder 150.

[0072] The movable table 142 is disposed horizontally on top of the second base 34. The movable table 142 is movable along the second base 34 in a direction approaching or moving away from the main body frame 14. The cylinder 144 biases the movable table 142 in a direction approaching or moving away from the main body frame 14. The workpiece holder 146 is held by the movable table 142. The workpiece holder 146 extends along the movement direction of the movable table 142. A pallet holder 150 is attached to one end of the workpiece holder 146.

[0073] The pallet holding unit 150 faces the processing station 16 and the main body frame 14. The pallet holding unit 150 is a plate body that is perpendicular to the axial direction of the workpiece holder 146. The pallet holding unit 150 is perpendicular to the moving direction of the movable table 142. The pallet holding unit 150 is capable of holding the workpiece W via the pallet 148.

[0074] By moving the movable stage 142 using the cylinder 144, the workpiece W held on the pallet 148 can be moved closer to or away from the processing station 16.

[0075] Next, the operation of the cutting machine 10 will be described.

[0076] First, the movable table 142 of the transport mechanism 30 holds the workpiece W on the pallet 148 at a position separated from the main body frame 14. The cylinder 144 is driven to move the movable table 142 together with the workpiece holder 146 toward the main body frame 14. As a result, the workpiece W reaches the processing station 16, and the workpiece W is held by the jig 26. The support carrier 52 is rotated so that the workpiece W is held by each of the four jigs 26.

[0077] Next, the jig 26 is placed in a position facing the support block 28, and the jig 26 is pulled toward the support block 28. The front surface 136 of the support block 28 is brought into contact with the rear surface 701 of the first reference seat 64 and the rear surface 881 of the second reference seat 66. This positions the jig 26 and the support block 28 at predetermined positions relative to each other. The connection portion 138 of the support block 28 is inserted into the connection ports 84 of the first and second reference seats 64, 66. This holds the jig 26 in the support block 28.

[0078] When the connection part 138 is inserted into the connection port 84, the tip surface 139 of the connection part 138 presses the piston 96 of the switching valve 68 in a direction away from the support block 28. The tip surface 139 abuts against the end wall portion 112 of the piston 96 over the entire circumference. As the piston 96 is pressed by the connection part 138, it moves toward the holder 92 against the elastic force of the spring 98.

[0079] As the piston 96 moves in a direction away from the support block 28, the port 116 moves away from the valve portion 108 and faces the communicating portion 110. A gap is created between the inner circumferential surface of the port 116 and the communicating portion 110. The air supply flow path 140 of the support block 28 communicates with the communicating passage 104 of the switching valve 68 through this gap. Air supplied to the air supply flow path 140 from an air supply source (not shown) is supplied to the air flow path 82 of the jig 26 through the port 116, the communicating passage 104, and the multiple holes 106.

[0080] The air flowing through the air flow path 82 is introduced into the drain tank 126 through the first tube 128. Inside the drain tank 126, the coolant contained in the air falls downward within the drain tank 126 due to gravity. This removes the coolant from the air. The air from which the coolant has been removed is guided from the drain tank 126 to the second tube 130 and the air flow path 82. The air is supplied from the air flow path 82 to the vicinity of the second bearing 124 of the second bearing portion 58. This allows the second bearing 124 to be suitably cooled by the air from which the coolant has been removed.

[0081] The coolant accumulated in the drain tank 126 flows from the drain hole 134 through the drain tube 132 to the drain passage 62 of the jig body 54. The coolant flows along the drain passage 62 to the drain discharge hole 90 of the second reference seat 66. The front surface 136 of the support block 28 abuts against the back surface 881 of the second reference seat 66. The drain discharge hole 90 is covered by the front surface 136 of the support block 28. Therefore, the coolant remains in the drain passage 62.

[0082] Next, the lifting motor 44 of the feed mechanism 20 is driven to lower the drive mechanism 18 and the tool head 22 toward the workpiece W. As a result, the tool 24 is lowered together with the tool head 22. The tool 24 is inserted into the pilot hole H of the workpiece W. The lower end of the tool 24 is inserted into the second bearing 124 of the second bearing portion 58. The first bearing 120 is inserted into and supported by the first support hole 118 of the first bearing portion 56. As a result, the upper and lower ends of the tool 24 are rotatably supported by the first and second bearing portions 56, 58.

[0083] The workpiece W is moved slightly in the horizontal direction by the transport mechanism 30, so that the axis of the pilot hole H in the workpiece W is aligned with the axis of the tool 24. The drive motor 42 is driven to rotate and further lower the tool 24. As a result, the inner surface of the pilot hole H is machined by the cutting tool 50, which rotates together with the tool 24. The inner surface of the pilot hole H in the workpiece W is machined to the desired inner diameter.

[0084] At this time, the upper and lower ends of the tool 24 are supported by the first and second bearings 120, 124. When the second bearing 124 rotates together with the tool 24, there is a concern that coolant scattered inside the processing station 16 may infiltrate into the second bearing 124 through a gap between the rotating and non-rotating parts of the second bearing 124. At this time, air supplied through the air flow path 82 prevents the coolant from infiltrating into the second bearing 124. In addition, heat is generated in the vicinity of the second bearing 124 as the second bearing 124 rotates. The air supplied through the air flow path 82 effectively cools the vicinity of the second bearing 124.

[0085] When machining the pilot hole H of another workpiece W held by the support carrier 52, first, the jig 26 holding the machined workpiece W is disconnected from the support block 28. By moving the jig 26 away from the support block 28, the first and second reference seats 64, 66 of the jig 26 are separated from the front surface 136 of the support block 28. This opens the drain discharge hole 90 of the second reference seat 66. The coolant that has been remaining in the drain passage 62 is discharged from the drain discharge hole 90 to the outside of the jig 26.

[0086] As the jig 26 moves away from the support block 28, the pressure of the switching valve 68 against the piston 96 by the connection portion 138 is released. The piston 96 moves in a direction away from the holder 92 due to the elastic force of the spring 98. As the piston 96 moves, the port 116 moves toward the valve portion 108. The port 116 is blocked by the valve portion 108, resulting in a valve closed state. As a result, the upstream end of the air flow path 82 is closed by the switching valve 68.

[0087] The support carrier 52 is rotated, and the jig 26 corresponding to the model specifications of the next workpiece W is made to face the support block 28. Then, the jig 26 is drawn toward the support block 28, and the front surface 136 of the support block 28 is brought into contact with the rear surface 701 of the first reference seat 64 and the rear surface 881 of the second reference seat 66. After the jig 26 and the support block 28 are positioned at predetermined positions, the transport mechanism 30 carries the next workpiece W into the positioned jig 26. The tool head 22 is lowered, and the tool 24 processes the pilot holes H of the workpiece W. At this time, while the pilot holes H are being processed, coolant is sprayed mainly on the processed portion of the workpiece W, and the processed portion is cooled.

[0088] Furthermore, when the cutting machine 10 is used to machine holes in the workpiece W, cutting of pilot holes H by the cutting tool 50 generates chips. Therefore, after the hole machining in the workpiece W is completed, coolant (liquid) is sprayed near the jig 26 and the support block 28 to clean the jig 26 and the support block 28. During the hole machining by the cutting tool 50, the coolant is continuously sprayed mainly on the machining portion of the workpiece W. This coolant adheres to the surfaces of the jig 26 and the support block 28.

[0089] When the jig 26 and the support block 28 are connected to sequentially machine a plurality of workpieces W, coolant adhering to the surface of the jig 26 or the support block 28 may infiltrate into the connection port 84 .

[0090] 5, the tip of the connection part 138 of the support block 28 is inserted into the connection port 84 into which the coolant has entered. At this time, the tip surface 139 of the connection part 138 is not in contact with the end wall portion 112 of the piston 96 of the switching valve 68 arranged on the first reference seat 64 and the second reference seat 66 of the jig 26. The switching valve 68 is not arranged in the air supply flow path 140 of the connection part 138. Therefore, air is supplied to the air supply flow path 140 in advance.

[0091] Therefore, air is supplied to the connection port 84, and the coolant in the connection port 84 is pushed out by the air flow into the discharge passage 76. If coolant is attached to the valve portion 108 and the end wall portion 112 of the switching valve 68, the air ejected from the opening at the tip of the connection portion 138 of the support block 28 moves the coolant radially outward in the space formed between the tip surface 139 of the connection portion 138 and the end wall portion 112 of the piston 96. The coolant flows into the discharge passage 76 via the space around the piston 96 (the annular space 97).

[0092] As a result, the coolant that has entered the connection port 84 is efficiently discharged to the outside. The connection part 138 is not in contact with the piston 96. Therefore, the piston 96 is not pressed toward the holder 92 by the connection part 138. Because the port 116 is closed by the valve part 108, the air and the coolant do not flow into the air flow path 82 of the jig 26.

[0093] 6, the jig 26 is pulled toward the support block 28, and the connection port 84 moves along the connection portion 138 until the end wall portion 112 of the piston 96 comes into contact with the connection portion 138. As a result, communication between the discharge passage 76 and the connection port 84 is blocked by the connection portion 138.

[0094] 3, when the support block 28 and the jig 26 are connected, the piston 96 is pressed by the connection part 138 toward the holder 92 against the elastic force of the spring 98. When the port 116 faces the communication part 110 of the rod 94, the air supply passage 140 of the support block 28 and the air passage 82 of the jig 26 communicate with each other through the communication passage 104 (switching valve). At this time, the communication between the discharge passage 76 and the connection port 84 is blocked by the connection part 138. Therefore, when air flows from the air supply passage 140 to the air passage 82, the air does not flow out to the outside through the discharge passage 76.

[0095] Even when chips enter the interior of the connection port 84, the chips can be discharged to the outside from the discharge passage 76 by using the air supplied to the connection port 84. This prevents the chips from moving together with the air through the air flow path 82 toward the second bearing 124 when the switching valve 68 is opened.

[0096] As described above, in the embodiment of the present invention, the support block 28 is held by the main body frame 14, and the support block 28 detachably holds the jig 26 that holds the workpiece W. The connection portion 138 of the support block 28 is connected to the first and second reference seats 64, 66 of the jig 26. The support block 28 and the jig 26 are positioned relative to each other by connecting the connection portion 138 to the first and second reference seats 64, 66. The air supply mechanism 141 can supply air from the support block 28 to the inside of the jig 26 when the support block 28 and the jig 26 are connected. The air supply mechanism 141 includes an air supply passage 140 arranged in the support block 28, an air passage 82 arranged in the jig 26, and a switching valve 68 arranged in the air passage 82.

[0097] When the jig 26 and the support block 28 are separated, coolant or chips adhering to the jig 26 and the support block 28 may infiltrate into the connection port 84. In the process of connecting the connection portion 138 of the support block 28 to the first reference seat 64 of the jig 26, before the connection portion 138 is inserted into the connection port 84 and the switching valve 68 is pressed by the tip surface 139 of the connection portion 138, the annular space 97 surrounded by the first reference seat 64, the connection portion 138, and the switching valve 68 communicates with the discharge passage 76. Note that the discharge passage 76 may be provided in the support block 28 instead of in the first reference seat 64.

[0098] This allows the air supplied to the air supply passage 140 to push away the coolant or chips that have entered the connection port 84 toward the discharge passage 76. As a result, the coolant or chips that have entered the connection port 84 can be discharged to the outside through the discharge passage 76. Furthermore, when coolant accumulates near the contact portions between the first and second reference seats 64, 66 of the jig 26 and the connection portion 138 of the support block 28, the air supplied to the air supply passage 140 can push away the coolant toward the discharge passage 76.

[0099] This makes it possible to prevent the coolant or chips from entering the air flow path 82 of the jig 26. This makes it possible to reliably prevent the coolant or chips from reaching the second bearing 124 of the second bearing portion 58 through the air flow path 82.

[0100] The changeover valve 68 includes a rod 94 having a valve portion 108, a piston 96 having a port 116 and movable in the axial direction of the rod 94, and a spring 98 for biasing the piston 96 in a direction in which the port 116 is closed by the valve portion 108. The piston 96 includes an end wall portion 112 surrounding the port 116. A connection portion 138 of the support block 28 has a tip surface 139 surrounding an air supply passage 140. The changeover valve 68 is opened by the piston 96 being pushed by the tip surface 139 of the connection portion 138 and moving. When the connection portion 138 pushes the piston 96, the entire circumference of the tip surface 139 of the connection portion 138 abuts against the end wall portion 112 of the piston 96. As a result, when the changeover valve 68 is opened, the tip surface 139 of the connection portion 138 and the end wall portion 112 of the piston 96 abut against each other over the entire circumference. Therefore, air does not leak from between the tip surface 139 and the end wall portion 112. As a result, when the switching valve 68 is opened, air can be reliably circulated from the air supply flow path 140 to the air flow path 82.

[0101] When the connection portion 138 of the support block 28 is connected to the first reference seat 64 of the jig 26, the valve portion 108 of the rod 94 in the switching valve 68 is inserted into the air supply flow passage 140 of the connection portion 138. Therefore, when the support block 28 and the jig 26 are connected, contact between the valve portion 108 and the connection portion 138 can be prevented.

[0102] The rod 94 of the changeover valve 68 has a shaft portion 95 disposed inside the piston 96, and a valve portion 108 provided at the other axial end of the shaft portion 95. The outer periphery of the valve portion 108 has an inclined surface 109 that expands in diameter from the valve portion 108 toward the shaft portion 95. This allows air to be guided radially outward of the rod 94 along the inclined surface 109 when the changeover valve 68 is closed as shown in FIG. 5. As a result, the air guided radially outward can push the coolant out to the discharge passage 76.

[0103] The first reference seat 64 is an annular member having a connection port 84 surrounding the switching valve 68, and the upper end of the drain passage 76 opens to the connection port 84 of the first reference seat 64. As a result, when the connection part 138 is connected to the connection port 84, the air supplied to the connection port 84 can push the coolant into the drain passage 76 and discharge it.

[0104] The lower end of the discharge passage 76 opens to the outer periphery of the first main body portion 70 at the first reference seat 64. Therefore, the coolant can be discharged to the outside of the first reference seat 64 through the discharge passage 76.

[0105] An annular space 97 communicating with the drain passage 76 is provided between the connection port 84 of the first reference seat 64 and the peripheral wall portion 114 of the switching valve 68. This allows the coolant that has entered the annular space 97 to be suitably discharged through the drain passage 76.

[0106] The air flow path 82 of the jig 26 is equipped with a drain tank 126, and the lower end of the drain tank 126 has a drain hole 134 for discharging the coolant therein. This makes it possible to reliably remove the coolant contained in the air flowing through the inside of the air flow path 82. The coolant that has accumulated inside the drain tank 126 can be discharged to the outside through the drain hole 134.

[0107] The second reference seat 66 has a drain discharge hole 90. The drain discharge hole 90 is connected to the drain passage 62 arranged inside the jig 26. When the connection part 138 of the support block 28 and the second reference seat 66 of the jig 26 are connected, the drain discharge hole 90 is closed by the connection part 138. When the connection part 138 is not connected to the second reference seat 66, the drain discharge hole 90 is opened so that the coolant can be discharged from the drain passage 62. As a result, when the support block 28 and the jig 26 are not connected, the coolant in the drain tank 126 can be discharged from the drain discharge hole 90 through the drain passage 62 to the outside. At the timing when the jig 26 and the support block 28 are separated from each other, the coolant in the drain tank 126 can be forcibly discharged to the outside by using the pressing force due to the residual pressure of the compressed air.

[0108] The above embodiment can be summarized as follows.

[0109] The above embodiment is a cutting machine (10) including a processing machine body (31) having a drive mechanism (18) that rotates and drives a tool (24) for cutting a workpiece (W), and a jig (26) that is detachable from the processing machine body and configured to hold the workpiece, The processing machine body is a main body frame (14) in which the drive mechanism is disposed; a support block (28) that detachably supports the jig and has a connection portion (138) that is connected to the connection portion (64, 66) of the jig, and that is disposed on the main body frame; an air supply mechanism (141) for supplying air from the support block to the inside of the jig; Equipped with The air supply mechanism includes a first air flow path (140) that is disposed on the support block and opens to the connection portion, and to which air is supplied from an air supply source; a second air flow path (82) disposed on the jig and opening to the connected portion; a switching valve (68) disposed in the jig, the switching valve being disposed in the second air flow path and being opened by being pressed by the connecting portion when the connecting portion and the connected portion are connected, thereby communicating the first air flow path and the second air flow path; having A discharge passage (76) is disposed in at least one of the connecting portion and the connected portion, The discharge passage communicates with a space surrounded by the connected portion, the connecting portion, and the switching valve before the switching valve opens during the process of connecting the connected portion and the connecting portion.

[0110] The switching valve includes a rod (94) having a valve portion (108), a piston (96) having a port (116) and movable in the axial direction of the rod, and a biasing member (98) that biases the piston in a direction in which the port is closed by the valve portion, The piston has an end wall (112) surrounding the port; The connection portion has a tip surface (139) surrounding the first air flow path, The piston is pushed by the tip surface of the connection portion and moves to open the switching valve, When the connecting portion pushes the piston, the entire circumference of the tip surface of the connecting portion abuts against the end wall portion of the piston.

[0111] When the connecting part is connected to the connected part, the valve part of the rod is inserted into the first air flow path.

[0112] The rod has a shaft portion (95) disposed inside the piston and the valve portion provided at one end of the shaft portion, The outer periphery of the valve portion has an inclined surface (109) that increases in diameter in a direction from the valve portion toward the shaft portion.

[0113] the connected portion is an annular member having an inner circumferential portion surrounding the switching valve, One end of the discharge passage opens at the inner periphery of the connected portion.

[0114] The other end of the discharge passage opens at the outer periphery of the connected portion.

[0115] An annular space (97) communicating with the discharge passage is formed between the inner periphery of the connected portion and the outer periphery of the switching valve.

[0116] The second air flow path is provided with a drain tank (126) that separates liquid contained in the air flowing through the second air flow path and stores it therein, and a lower end of the drain tank has a drain hole (134) that drains the liquid inside the drain tank.

[0117] The support block has a second connection portion, the jig has a second connected portion to which the second connecting portion can be connected, The drain hole is connected to a drain passage (62) disposed inside the jig, The downstream end of the drain passage opens at the second connected portion, When the second connection portion is connected to the second connected portion, the opening is closed by the second connection portion, When the second connecting portion is not connected to the second connected portion, the opening is open to allow the liquid to be discharged from the drain passage.

[0118] The present invention is not limited to the above-described embodiment, and various configurations may be adopted without departing from the gist of the present invention. The configuration of the cutting machine 10 is not limited to the vertical type described above, and may be, for example, a horizontal type in which the main body frame extends horizontally. [Explanation of symbols]

[0119] 10... Cutting machine 26... Jig 28... Support block 31... Processing machine body 60...Drain discharge mechanism 62...Drain passage 64...1st reference seat 66...2nd reference seat 68: Switching valve 76: Discharge passage 82...Air flow path 84...Connection port 90: Drain hole 140: Air supply passage

Claims

1. A cutting machine (10) including a processing machine body (31) having a drive mechanism (18) that rotates and drives a tool (24) for cutting a workpiece (W), and a jig (26) that is detachable from the processing machine body and configured to be able to hold the workpiece, The processing machine body is a main body frame (14) in which the drive mechanism is disposed; a support block (28) that detachably supports the jig and has a connection portion (138) that is connected to the connected portion (64, 66) of the jig and is disposed on the main body frame; an air supply mechanism (141) for supplying air from the support block to the inside of the jig; Equipped with The air supply mechanism includes a first air flow path (140) that is disposed on the support block and opens to the connection portion, and through which air is supplied from an air supply source; A second air flow path (82) disposed on the jig and opening to the connected portion; a switching valve (68) disposed in the jig, the switching valve being disposed in the second air flow path, and being pressed by the connecting portion to be opened when the connecting portion and the connected portion are connected, thereby communicating the first air flow path and the second air flow path; having A discharge passage (76) is disposed in at least one of the connecting portion and the connected portion, the exhaust passage communicates with a space surrounded by the connected part, the connecting part, and the switching valve before the switching valve opens during the process of connecting the connected part and the connecting part, and when the connected part and the connecting part are connected, communication with the first air flow path and the second air flow path is blocked.

2. 2. The cutting machine according to claim 1, The switching valve includes a rod (94) having a valve portion (108), a piston (96) having a port (116) and movable in an axial direction of the rod, and a biasing member (98) that biases the piston in a direction in which the port is closed by the valve portion, The piston has an end wall (112) surrounding the port; The connection portion has a tip surface (139) surrounding the first air flow path, The piston is pushed by the tip surface of the connection portion and moves to open the switching valve, When the connection portion pushes the piston, the entire circumference of the tip surface of the connection portion abuts against the end wall portion of the piston.

3. 3. The cutting machine according to claim 2, When the connecting portion is connected to the connected portion, the valve portion of the rod is inserted into the first air flow path.

4. The cutting machine according to claim 3, The rod has a shaft portion (95) disposed inside the piston and the valve portion provided at one end of the shaft portion, The outer periphery of the valve portion has an inclined surface (109) whose diameter increases in a direction from the valve portion toward the shaft portion.

5. 2. The cutting machine according to claim 1, the connected portion is an annular member having an inner circumferential portion surrounding the switching valve, One end of the discharge passage opens at the inner periphery of the connected portion.

6. The cutting machine according to claim 5, The other end of the discharge passage opens at an outer periphery of the connected portion.

7. The cutting machine according to claim 5, a cutting machine, wherein an annular space (97) communicating with the discharge passage is formed between the inner periphery of the connected portion and the outer periphery of the switching valve.

8. 2. The cutting machine according to claim 1, the second air flow path is provided with a drain tank (126) that separates liquid contained in the air flowing through the second air flow path and stores the liquid therein, and a lower end of the drain tank has a drain hole (134) that drains the liquid inside the drain tank.

9. The cutting machine according to claim 8, The support block has a second connection portion, the jig has a second connected portion to which the second connection portion can be connected, The drain hole is connected to a drain passage (62) disposed inside the jig, A downstream end of the drain passage opens at the second connected portion, When the second connection portion is connected to the second connected portion, the opening is closed by the second connection portion; When the second connecting portion is not connected to the second connected portion, the opening is open to allow the liquid to be discharged from the drain passage.

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