Cover member and machine tool

Abstract

The cover member (20) of this specification protects the feed shaft mechanism (14) of the platform (18) that supports and feeds the machine tool (10) from below. It includes: an outer wall portion (38) that covers the feed shaft mechanism; and an inner wall portion (40) located between the outer wall portion and the feed shaft mechanism, which is separate from the outer wall portion and covers the feed shaft mechanism. One of the outer wall portion and the inner wall portion has: an inclined portion (48) that extends obliquely downward toward the lower end (38a, 40a) of the other, forming a gap (54) with the lower end.

Description

Technical Field

[0001] This instruction manual pertains to cover components and machine tools. Prior Technology

[0002] Japanese Patent Application Publication No. 2004-255545 discloses a cover component (movable cover) for a platform (workpiece platform) of a machine tool. Summary of the Invention

[0003] We expect better cover components and machine tools.

[0004] The first aspect of this specification is a cover member that protects the feed shaft mechanism of a platform that supports and feeds a machine tool from below. It includes: an outer wall portion that covers the feed shaft mechanism; and an inner wall portion located between the outer wall portion and the feed shaft mechanism, separated from the outer wall portion and covering the feed shaft mechanism; and one of the outer wall portion and the inner wall portion has: an inclined portion that extends obliquely downward toward the lower end of the other, forming a gap with the lower end.

[0005] The second aspect of this specification is a machine tool, which includes: the aforementioned cover member; the aforementioned platform; and the aforementioned feed axis mechanism.

[0006] The aforementioned objectives, features, and advantages can be readily understood from the following description of embodiments with reference to the accompanying drawings. Simple Explanation of the Diagram

[0007] Figure 1 is a schematic diagram showing a portion of a machine tool in one embodiment.

[0008] Figure 2 is a schematic diagram showing a portion of a machine tool.

[0009] Figure 3 is a schematic diagram showing a portion of a machine tool.

[0010] Figure 4 is a schematic diagram showing a portion of the machine tool of Modified Example 1.

[0011] Figure 5 is a schematic diagram showing a portion of the machine tool in Modified Example 2. Implementation

[0012] [Preferred form of the invention]

[0013] Japanese Patent Application Publication No. 2004-255545 proposes a method using a cover member disposed around a platform to guide foreign matter such as cutting chips and cutting fluid to below the platform. However, the platform has a feed axis mechanism below it that feeds the platform in a predetermined feed axis direction. If foreign matter adheres to the feed axis mechanism, it may obstruct the operation of the feed axis mechanism.

[0014] Based on the above preliminary explanation, the following describes an implementation form.

[0015] Furthermore, the X and Y directions used in the following description are parallel to the horizontal plane (horizontal direction). The X and Y directions are orthogonal to each other (see also Figure 2). The X direction includes the X1 direction and its opposite direction, the X2 direction. The Y direction includes the Y1 direction and its opposite direction, the Y2 direction.

[0016] Furthermore, the Z-direction used in the following explanation is perpendicular to the horizontal plane. That is, the Z-direction is the vertical direction. The Z-direction includes the upward direction, namely the Z1 direction, and the downward direction (the direction of gravity), namely the Z2 direction (see also Figure 1).

[0017] (I. Implementation Form) Figure 1 is a schematic diagram showing a portion of a machine tool 10 in one embodiment. Figure 2 is a schematic diagram showing a portion of the machine tool 10.

[0018] Machine tool 10 is a cutting machine such as a machining center. Machine tool 10 includes: a support unit 12; a feed axis mechanism 14; and a platform unit 16. Platform unit 16 includes: a platform 18; and a pair of cover members 20. Furthermore, although not shown in the figure, machine tool 10 also includes: a spindle head located above platform unit 16. This spindle head is equipped with the tool used by machine tool 10 for machining. This spindle head (spindle) may also have a nozzle for spraying cutting fluid (center-outlet type).

[0019] The support unit 12 is, for example, the saddle of the machine tool 10. The saddle, i.e., the support unit 12, can be supported by a base (bed) (not shown) provided by the machine tool 10. Furthermore, the support unit 12 is omitted from the illustration in Figure 2.

[0020] As shown in Figure 1, the support portion 12 has: a base 121; and a pair of track support portions 122 protruding upward from the base 121. The pair of track support portions 122 support the pair of guide rails 24, which will be described later. Also, as shown in Figure 1, the support portion 12 may also have a sliding portion 12a. The sliding portion 12a is supported, for example, by a guide portion (guide rail) not shown, and is able to slide in the Y direction.

[0021] The feed axis mechanism 14 is used to move the platform unit 16 along the feed axis direction. In this embodiment, the X direction corresponds to the feed axis direction. The feed axis mechanism 14 includes: a ball screw 22; a pair of guide rails 24; and a pair of sliders 26. A portion of the ball screw 22 is omitted from the illustration in Figure 2.

[0022] As shown in Figure 1, the ball screw 22 includes a nut 28 and a screw member 30. The nut 28 is mounted, for example, on the lower part 18a of the platform 18. The screw member 30 is screwed to the nut 28. The axial direction of the screw member 30 coincides with the X direction. Furthermore, the screw member 30 is connected to a drive source (not shown) for rotating the screw member 30. This drive source is, for example, an electric motor.

[0023] As shown in Figure 1, a pair of sliders 26 support the platform 18 from below. A pair of guide rails 24 support the pair of sliders 26 so that they can slide. As shown in Figure 2, the guide rails 24 extend along the X direction. Therefore, the sliders 26 are guided by the guide rails 24 and can slide along the X direction.

[0024] The platform unit 16 is able to move along the X direction together with the paired sliders 26 in response to the rotation of the screw member 30.

[0025] Platform 18 is a stand that supports a workpiece (not shown) to be machined by machine tool 10. Platform 18 may also have a fixture (not shown) for fixing the workpiece to platform 18. Machine tool 10 can use a tool mounted on a spindle head (not shown) to machine the workpiece supported by platform 18.

[0026] Platform 18 has ends 32 (321, 322) in the X direction. The ends 32 of platform 18 include: a first end 321 in the X1 direction; and a second end 322 in the X2 direction. As shown in FIG2, each of the two ends 32 of platform 18 is connected to a telescopic cover 34 (341, 342). More specifically, the first end 321 is connected to a first telescopic cover 341. The first telescopic cover 341 extends from the first end 321 in the X1 direction. The second end 322 is connected to a second telescopic cover 342. The second telescopic cover 342 extends from the second end 322 in the X2 direction. The telescopic covers 34 are configured to cover a pair of guide rails 24. The telescopic covers 34 extend and retract in response to movement of platform 18 along the X direction.

[0027] Furthermore, platform 18 has sides 36 (361, 362) in the Y direction. The sides 36 of platform 18 include: a first side 361 in the Y1 direction; and a second side 362 in the Y2 direction. The aforementioned telescopic cover 34 cannot cover the slider 26 located below platform 18, nor a portion of the guide rail 24. Therefore, to prevent foreign matter such as cutting chips and fluid from winding around to the underside 36 of platform 18 and adhering to the feed axis mechanism 14, a pair of cover members 20 are installed on the sides 36 of platform 18. More specifically, a first cover member 201 is installed on the first side 361, and a second cover member 202 is installed on the second side 362.

[0028] As shown in Figure 1, the first cover member 201 and the second cover member 202 are linearly symmetrical about the center line LA of the platform 18, which is parallel to the Z direction. Based on this, in order to avoid lengthy explanations, the following description will focus on one of the pair of cover members 20 (the second cover member 202).

[0029] The cover member 20 is a structure (cover unit) used to protect the feed axis mechanism 14 from foreign objects. More specifically, the cover member 20 is a cover unit used to protect at least the portion of the feed axis mechanism 14 located below the platform 18 from foreign objects such as cutting chips and cutting fluid.

[0030] Figure 3 is a schematic diagram showing a portion of the machine tool 10. The interior of the cover member 20 is shown in Figure 3.

[0031] The cover member 20 includes: an outer wall portion 38; an inner wall portion 40; and a pair of connecting wall portions 42. The inner wall portion 40 and the outer wall portion 38 are spaced apart in the Y direction (horizontal direction). In FIG3, the direction from the outer wall portion 38 toward the inner wall portion 40 (feed shaft mechanism 14) conforms to the Y1 direction. The pair of connecting wall portions 42 includes: a first connecting wall portion 421 (FIG. 1) at the X1 direction end of the cover member 20; and a second connecting wall portion 422 (FIG. 3) at the X2 direction end of the cover member 20. Furthermore, the cover member 20 has an internal space 44. The internal space 44 is the space surrounded by the outer wall portion 38, the inner wall portion 40, and the pair of connecting wall portions 42.

[0032] The outer wall portion 38 is a wall portion that covers the feed shaft mechanism 14. The outer wall portion 38 has a first vertical portion (vertical portion) 46 and an inclined portion 48. The first vertical portion 46 and the inclined portion 48 are preferably connected. For example, the first vertical portion 46 and the inclined portion 48 are preferably integrally formed by welding in the manufacturing stage of the outer wall portion 38.

[0033] The first vertical portion 46 is a portion of the outer wall portion 38 that extends along the Z direction (vertical direction). The first vertical portion 46 is mounted on the platform 18. The first vertical portion 46 can also be detachably mounted on the platform 18.

[0034] The inclined portion 48 is the portion extending from the lower end portion 46a of the first vertical portion 46 within the outer wall portion 38. The inclined portion 48 has an inclined surface 48b that slopes downwards towards the lower end portion 40a of the inner wall portion 40. The inclined surface 48b is a plane facing the inner space 44. The angle of inclination α of the inclined surface 48b relative to the horizontal plane (a plane parallel to the horizontal plane) is, for example, 45 degrees, but is not limited to this. The angle of inclination α can also be appropriately determined within, for example, a range of 10 degrees to 80 degrees.

[0035] The inner wall portion 40 is a vertical wall portion located between the outer wall portion 38 and the feed shaft mechanism 14. That is, the inner wall portion 40 extends in the Z direction between the outer wall portion 38 and the feed shaft mechanism 14. The inner wall portion 40 covers the feed shaft mechanism 14 between the outer wall portion 38 and the feed shaft mechanism 14. The inner wall portion 40 and the track support portion 122 of the support portion 12 face each other in the Y direction. Although the inner wall portion 40 and the track support portion 122 are separated in the Y direction, they should be as close as possible. The lower end portion 40a of the inner wall portion 40 faces the lower part of the track support portion 122 of the support portion 12 in the Y direction. The lower end portion 40a of the inner wall portion 40 should preferably be located below the lower end portion 48a of the inclined portion 48. More precisely, the lower end portion 40a of the inner wall portion 40 should preferably be located below the lower end portion 48b1 of the inclined surface 48b. Furthermore, the lower end portion 48a of the inclined portion 48 is also the lower end portion 38a of the outer wall portion 38. The upper end portion 40b of the inner wall portion 40 is positioned in the Y direction opposite to the guide rail 24 or the slider 26. In other words, the upper end portion 40b of the inner wall portion 40 is located above the track support portion 122 of the support portion 12 in the Z direction. The upper end portion 40b of the inner wall portion 40 and the lower portion 18a of the platform 18 should preferably be closed, but this is not limited to this. For example, due to manufacturing errors of the platform 18 and the inner wall portion 40, a relatively small gap 50, as shown in FIG. 3, may be formed between the upper end portion 40b of the inner wall portion 40 and the lower portion 18a of the platform 18. Such a gap 50 is permissible.

[0036] The paired connecting wall portions 42 are wall portions that connect the outer wall portion 38 and the inner wall portion 40. As described above, the paired connecting wall portions 42 include: a first connecting wall portion 421 (see also Figure 1) and a second connecting wall portion 422 (Figure 3). The upper end of the connecting wall portion 42 is preferably closed with the lower part 18a of the platform 18, but is not limited thereto. Similarly, a relatively small gap may be allowed between the upper end 40b of the inner wall portion 40 and the lower part 18a of the platform 18.

[0037] The outer wall portion 38 is connected to the connecting wall portion 42. For example, the outer wall portion 38 and the connecting wall portion 42 are integrally formed by welding during the manufacturing process of the cover member 20. Similarly, the inner wall portion 40 is connected to the connecting wall portion 42. For example, the inner wall portion 40 and the connecting wall portion 42 are integrally formed by welding during the manufacturing process of the cover member 20. Thus, the cover member 20 is configured as a cover unit integrally having the outer wall portion 38 and the inner wall portion 40.

[0038] The cover component 20 further includes an insertion part 52 and a gap 54.

[0039] The insertion part 52 allows a component (insertion component) to insert through the notch part of the cover component 20 along the X direction. Although the specific insertion component is not limited, it is preferably a tubular component such as a hose that supplies lubricating oil to, for example, the slider 26. The shape of the insertion part 52 is not limited to the illustrations in FIGS. 1 and 3. The insertion part 52 may also be formed at the opening of the cover component 20 (also refer to FIG. 5).

[0040] The gap 54 is located between the lower end part 48a of the inclined part 48 and the lower end part 40a of the inner wall part 40. In other words, the gap 54 is located at the lower end part 20a of the cover component 20. The gap 54 opens downward at the lower end part 20a of the cover component 20. The lower end part 20a of the cover component 20 and the base part 121 of the support part 12 are separated in the Z direction. Therefore, through the gap 54, the internal space 44 of the cover component 20 surrounded by the outer wall part 38, the inner wall part 40, and the connecting wall part 42 communicates with the external space of the cover component 20. As described above, since the inclined part 48 inclines obliquely downward toward the lower end part 40a of the inner wall part 40, the dimension of the gap 54 in the Y direction is set to be narrow. Also, the first distance H1 and the second distance H2 are shown in FIG. 3. The first distance H1 is the separation distance in the Z direction between the lower end of the gap 54 (lower end part 20a) and the top surface of the base part 121 of the support part 12. The second distance H2 is the separation distance in the Z direction between the bottom surface of the lower part 18a of the platform 18 and the top surface of the base part 121 of the support part 12. The first distance H1 is shorter than the second distance H2 (H1 < H2). The first distance H1 is, for example, one-fifth or less of the second distance H2, but is not limited thereto. The first distance H1 may also be, for example, one-tenth or less of the second distance H2. The first distance H1 is set to be as short as possible, but should be longer than the dimension of the gap 54 in the Y direction.

[0041] As described above, the cover component 20 can be detachably installed on the platform 18. In this case, a plurality of cover components 20 with different dimensions of the gap 54 in the X direction and the Y direction can also be selectively installed on the platform 18.

[0042] The description of one embodiment is as above. According to one embodiment, the cover component 20 can exhibit the functions and effects described below.

[0043] The outer wall portion 38 prevents foreign matter such as cutting chips and fluid from reaching the feed axis mechanism 14. The inner wall portion 40 prevents foreign matter that bypasses the outer wall portion 38 from reaching the feed axis mechanism 14. For example, the inner wall portion 40 prevents foreign matter that enters the internal space 44 via the aforementioned insertion portion 52 from reaching the feed axis mechanism 14. Thus, because the cover member 20 has multiple wall portions (outer wall portion 38, inner wall portion 40), it can effectively prevent foreign matter from reaching the feed axis mechanism 14. Furthermore, a gap 54 is formed between the lower end portion 38a of the outer wall portion 38 and the lower end portion 40a of the inner wall portion 40. The gap 54 can discharge foreign matter that enters the internal space 44 downwards from the cover member 20. Moreover, according to this embodiment, the outer wall portion 38 has an inclined portion 48 that slopes downwards towards the lower end portion 40a of the inner wall portion 40. The inclined portion 48 allows foreign matter that enters the internal space 44 to slide down along the inclined surface 48b of the inclined portion 48 into the gap 54. Furthermore, by tilting the inclined portion 48 downwards towards the lower end portion 40a of the inner wall portion 40, a narrower gap 54 is formed. This prevents foreign objects from entering the internal space 44 through the gap 54.

[0044] The cover member 20 is an integral cover unit having an outer wall portion 38 and an inner wall portion 40. Therefore, when the platform 18 moves in the feed axis direction, the outer wall portion 38 and the inner wall portion 40 move integrally in the feed axis direction. This allows the area below the platform 18 to be continuously covered by the outer wall portion 38 and the inner wall portion 40. Furthermore, as described above, in this embodiment, the axial feed direction of the platform 18 coincides with the X direction.

[0045] The outer wall portion 38 and the inner wall portion 40 are connected by a connecting wall portion 42. This prevents the cover member 20 from forming any gaps beyond what is necessary. Therefore, it prevents foreign objects from entering the interior space 44 of the cover member 20. The outer wall portion 38 and the inner wall portion 40 can each be connected to the connecting wall portion 42 by, for example, welding.

[0046] The inner wall 40 is a vertical wall. Vertical walls easily bounce foreign objects off. By being a vertical wall, the inner wall 40 can more reliably bounce foreign objects that enter the internal space 44. In this case, the foreign object bounces towards the inclined surface 48b. Therefore, the function of guiding the foreign object to the gap 54 by the inclined surface 48b can be further enhanced.

[0047] The lower end portion 40a of the inner wall portion 40 is located further below the lower end portion 48a of the inclined portion 48. This allows foreign objects sliding down the inclined surface 48b to collide with the inner wall portion 40. The foreign object colliding with the inner wall portion 40 rebounds from the inner wall portion 40 toward the outer wall portion 38 and is discharged through the gap 54. That is, the inner wall portion 40 can rebound the foreign object in the direction opposite to the direction toward the feed axis and discharge the foreign object through the gap 54. This further prevents foreign objects from reaching the feed axis mechanism 14.

[0048] The first distance H1 is set to be as short as possible, but preferably longer than the dimension in the Y direction of the gap 54. By making the first distance H1 longer than the dimension in the Y direction of the gap 54, concerns about foreign objects discharged from the gap 54 clogging the gap 54 can be reduced.

[0049] Multiple cover components 20 of different sizes can be selectively installed on the platform 18. This allows the size of the gap 54 to be changed according to, for example, the type and model of the machine tool 10, and the processing performed. By changing the size of the gap 54, the maximum number of foreign objects discharged through the gap 54 per unit time can be changed. Furthermore, the method of installing the cover component 20 on the platform 18 is, for example, screwing, but is not particularly limited.

[0050] Furthermore, the cover member 20 includes an insertion portion 52, allowing the insertion member to be inserted along the X direction (feed axis direction). Therefore, even when the platform 18 moves in the feed axis direction, the cover member 20 and the insertion member do not interfere with each other. Thus, the cover member 20 does not obstruct the movement of the platform 18 in the feed axis direction.

[0051] One embodiment may also be modified as described below. In the following modifications, descriptions that are repeated in the embodiments will be omitted. Furthermore, the figures used in the following modifications use the same symbols for components that are identical to those described in the embodiments.

[0052] (Variation Example 1) Figure 4 is a schematic diagram showing a portion of the machine tool 10 of Modified Example 1.

[0053] The cover member 20 may also have a plurality of inner wall portions 40. In this case, the plurality of inner wall portions 40 may also be arranged along the Y1 direction (first direction) from the outer wall portion 38 toward the feed shaft mechanism 14. By having a plurality of inner wall portions 40 that prevent foreign objects from reaching the feed shaft mechanism 14, it is possible to further suppress the arrival of foreign objects at the feed shaft mechanism 14.

[0054] (Variation Example 2) Figure 5 is a schematic diagram showing a portion of the machine tool 10 in Modified Example 2.

[0055] The inner wall portion 40 may also have an inclined portion 48. More specifically, the inner wall portion 40 may also have: a vertical portion (second vertical portion) 56; and an inclined portion 48.

[0056] The second vertical portion 56 includes the upper end portion 40b of the inner wall portion 40, which is a wall portion extending in the vertical direction. The inclined portion 48 of the inner wall portion 40 extends obliquely downward from the lower end portion 56a of the second vertical portion 56 toward the lower end portion 38a of the outer wall portion 38.

[0057] In this case, the inclined portion 48 also has an inclined surface 48b facing the internal space 44. The inclined portion 48 allows foreign objects to slide down along the inclined surface 48b into the gap 54.

[0058] Additionally, the outer wall portion 38 shown in Figure 5 is a vertical wall portion, but it is not limited to this. That is, although the figure is omitted, the outer wall portion 38 and the inner wall portion 40 may each have an inclined portion 48.

[0059] (Variation Example 3) The shape of the first cover member 201 installed on the first side 361 of the platform 18 and the shape of the second cover member 202 installed on the second side 362 of the platform 18 may also be non-linearly symmetrical.

[0060] For example, the dimensions of the gap 54 of the first cover member 201 in the X and Y directions may be different from the dimensions of the gap 54 of the second cover member 202 in the X and Y directions.

[0061] (Variation Example 4) The machine tool 10 may also be further equipped with a telescopic cover (not shown) connected to the support part 12 (sliding part 12a). This telescopic cover covers the guide part (described above) that supports the sliding part 12a. Furthermore, the telescopic cover can extend and retract in response to movement of the support part 12 along the Y direction. By equipping the machine tool 10 with this telescopic cover, the guide part, sliding part 12a, etc., can be protected from foreign matter such as cutting chips and cutting fluid.

[0062] (A combination of many variations) Most of the aforementioned variations can also be appropriately combined within a non-contradictory range.

[0063] According to the above embodiment, the cover member 20 can reduce the number of foreign objects reaching the feed shaft mechanism 14.

[0064] Regarding the above-mentioned implementation methods, the following notes are further provided.

[0065] (Note 1) The cover member (20) of this specification protects the feed shaft mechanism (14) of the platform (18) that supports and feeds the machine tool (10) from below. It includes: an outer wall portion (38) that covers the aforementioned feed shaft mechanism; and an inner wall portion (40) located between the aforementioned outer wall portion and the aforementioned feed shaft mechanism, separated from the aforementioned outer wall portion and covering the aforementioned feed shaft mechanism; and one of the aforementioned outer wall portion and the aforementioned inner wall portion has: an inclined portion (48) that extends obliquely downward toward the lower end (38a, 40a) of the other, forming a gap (54) with the aforementioned lower end.

[0066] (Note 2) It may also be the cover component described in Note 1, wherein the aforementioned cover component is: a cover unit integrally having the aforementioned outer wall portion and the aforementioned inner wall portion.

[0067] (Note 3) It may also be the cover member described in Note 1 or 2, wherein a plurality of the aforementioned inner wall portions are arranged along a first direction from the aforementioned outer wall portion toward the aforementioned feed shaft mechanism.

[0068] (Note 4) It may also be the cover member described in any of Notes 1 to 3, wherein the aforementioned outer wall portion has: a vertical portion extending in the vertical direction; and the aforementioned inclined portion connected to the lower end of the aforementioned vertical portion; and the aforementioned inner wall portion is a vertical wall portion extending in the aforementioned vertical direction.

[0069] (Note 5) It may also be the cover member described in Note 4, wherein the lower end (40a) of the aforementioned inner wall portion is located further below the lower end (48a) of the aforementioned inclined portion.

[0070] (Note 6) The machine tool (10) described in this manual includes: the cover member described in any one of notes 1 to 5; the aforementioned platform; and the aforementioned feed axis mechanism.

[0071] (Note 7) It may also be the machine tool described in Note 6, in which a plurality of the aforementioned cover components with different clearance dimensions may be selectively installed on the aforementioned platform.

[0072] This specification has been described in detail, but it is not limited to all embodiments. Such embodiments may be modified by various additions, substitutions, alterations, and partial deletions without departing from the spirit and intent of this specification or the spirit and intent derived from the content described in the claims and their equivalents. Furthermore, these embodiments may also be implemented in combination. For example, the order of actions or processes in the above embodiments is merely an example and is not a limitation. The same applies to the numerical values ​​or formulas used in the description of the above embodiments.

[0073] 10: Machine Tools 12: Support Department 12a: Sliding part 14: Feed axis mechanism 16: Platform Unit 18: Platform 18a:lower part 20: Cover component 20a: Lower end 22: Ball screw 24: Guide rail 26: Slider 28: Nuts 30: Screw assembly 32: End 34: Telescopic Cover 36: Side 38: Outer wall section 38a: Lower end 40:Inner wall part 40a: Lower end 40b: Upper end 42: Connecting wall portion 44: Interior Space 46: First vertical section 46a: Lower end 48: Inclined section 48a: Lower end 48b: Inclined surface 48b1: Lower end 50: Gaps 52: Insertion section 54: Gap 56: Second vertical section 56a: Lower end 121: Base 122: Track Support Unit 201: First cover component 202: Second cover component 321: First end 322: Second end 341: First telescopic cover 342: Second telescopic cover 361: First side 362: Second side 421: First connecting wall portion 422: Second connecting wall portion H1: First distance H2: Second distance LA: Centerline X,X1,X2,Y,Y1,Y2,Z,Z1,Z2: direction α: Inclination angle

Claims

1. A cover member (20) for protecting a feed axis mechanism (14) that feeds to a platform (18) from below, the platform being disposed on a machine tool (10) and supporting a workpiece processed by the machine tool; the cover member (20) comprising: an outer wall portion (38) for covering the feed axis mechanism; and an inner wall portion (40) located between the outer wall portion and the feed axis mechanism, separated from the outer wall portion and covering the feed axis mechanism; and one of the outer wall portion and the inner wall portion having: an inclined portion (48) extending obliquely downward toward the lower end portion (38a, 40a) of the other, forming a gap (54) with the lower end portion.

2. As in claim 1, the cover component, wherein, The cover component is an integral cover unit having the outer wall portion and the inner wall portion.

3. The cover component as requested in item 1 or 2, wherein, A plurality of inner wall portions are arranged along a first direction from the outer wall portion toward the feed shaft mechanism.

4. The cover component as requested in item 1 or 2, wherein, The outer wall portion has: a vertical portion extending in the vertical direction; and an inclined portion connected to the lower end of the vertical portion; and the inner wall portion is a vertical wall portion extending in the vertical direction.

5. The cover component as claimed in claim 4, wherein, The lower end (40a) of the inner wall portion is located below the lower end (48a) of the inclined portion.

6. A machine tool comprising: a cover member as claimed in claim 1 or 2; the platform; and the feed axis mechanism.

7. The machine tool as described in request item 6, wherein, The cover components with different gap sizes can be selectively installed on the platform.

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