Cover device for machine tool

Abstract

To provide a cover device for a machine tool that prevents coolant from leaking outside a machine without using a packing.SOLUTION: A cover device 1 for a machine tool comprises: a first sheet metal cover 2 which is disposed on the side closer to a blowing position of coolant; a second sheet metal cover 3 which is disposed on the side farther from the blowing position of coolant so as to be adjacent to the first sheet metal cover 2; and a liquid-wet prevention plate 4 which is disposed on the outside of both sheet metal covers 2, 3, fixed to the second sheet metal cover 3 through welding, and fixed to the first sheet metal cover 2 with a threaded member 5. The liquid-wet prevention plate 4 includes an adhesion surface 4a that is in close contact with both sheet metal covers 2, 3 and covers a gap G between them, and a gutter-forming surface 4b that is provided continuously from the adhesion surface 4a to form a gutter for guiding the coolant downward between the liquid-wet prevention plate and the first sheet metal cover 2. Caulking 6 for preventing leakage of liquid is applied to the end portion of the liquid-wet prevention plate 4 located on the side of the second sheet metal cover 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cover device for a machine tool for preventing coolant scattered in the machine tool from leaking outside the machine tool (liquid leakage).

Background Art

[0002] As such a cover device for a machine tool, it is known to use a unit in which two rectangular metal plates (hereinafter referred to as "sheet metal covers") are arranged adjacent to each other.

[0003] In a cover device for a machine tool, as disclosed in Patent Document 1, it is well known to use packing. Even in a cover device in which two sheet metal covers are arranged adjacent to each other, when high-pressure coolant strikes directly, due to the necessity of preventing the coolant from leaking outside the machine tool, packing is attached to the adjacent surfaces to fix the sheet metal covers to each other via the packing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] However, the work of attaching the packing may cause work mistakes such as gaps, distortions, peeling, and even forgetting to attach. In that case, there is a problem that coolant leakage occurs and becomes a claim. In addition to the increase in the cost of the packing itself, the increase in the number of assembly man-hours and the reattachment work during maintenance also cause further cost increases.

[0006] An object of the present invention is to provide a cover device for a machine tool that solves the problems of the above-described conventional devices and prevents coolant from leaking outside the machine without using a packing.

Means for Solving the Problems

[0007] The cover device for a machine tool according to the present invention is a cover device for preventing coolant scattered in the machine tool from leaking outside the machine, and includes a first sheet metal cover disposed on the side closer to the coolant blowing position, and a second sheet metal cover disposed on the side farther from the coolant blowing position so as to be adjacent to the first sheet metal cover. A liquid leakage prevention plate is disposed from the outside of the machine of both sheet metal covers, is fixed to the second sheet metal cover by welding, and is fixed to the first sheet metal cover by a screw member. The liquid leakage prevention plate has a close contact surface that closely contacts both sheet metal covers and covers a gap between both sheet metal covers, and a gutter forming surface that is provided so as to be continuous with the close contact surface and forms a gutter for guiding the coolant downward between the liquid leakage prevention plate and the first sheet metal cover. A caulking for preventing liquid leakage is provided at an end portion of the liquid leakage prevention plate located on the second sheet metal cover side.

[0008] The high-pressure coolant blown out from the blowing position hits the adjacent surface of the first sheet metal cover and the second sheet metal cover from an oblique direction. Relatively, it is likely to leak outside the machine from the side of the second sheet metal cover disposed farther from the coolant blowing position, and it is less likely to leak outside the machine from the side of the first sheet metal cover disposed closer to the coolant blowing position. Correspondingly, the liquid leakage prevention plate is not formed symmetrically with respect to the adjacent surface of the first sheet metal cover and the second sheet metal cover, but is formed asymmetrically.

[0009] Specifically, as a first feature, the liquid splash prevention plate is fixed to the first sheet metal cover disposed on the side closer to the coolant blowing position by a screw member, while it is fixed to the second sheet metal cover disposed on the side farther from the coolant blowing position by welding. The contact surface provided on the liquid splash prevention plate consists of a portion that contacts the first sheet metal cover fixed by a screw member and a portion that contacts the second sheet metal cover fixed by welding. By being in close contact, it has a high liquid leakage prevention effect. Note that as the screw member, for example, for the male screw, it can be a bolt having a hexagonal head or a bolt with a hexagonal socket, and for the female screw, a female screw can be formed on the liquid splash prevention plate, or a nut as a separate member can be used, and various screw members can be used.

[0010] And as a second feature, the liquid splash prevention plate is provided with a gutter forming surface for forming a gap (gutter) for guiding the coolant downward between it and the first sheet metal cover. By this gutter, the coolant that tries to leak outside along the inner surface of the first sheet metal cover can be guided downward and discharged to the required location.

[0011] Furthermore, as a third feature, caulking for preventing liquid leakage is applied to the end portion of the liquid splash prevention plate located on the second sheet metal cover side. The high-pressure coolant blown out from the blowing position is almost blocked by the contact surface and is in a state where there is no tendency to ooze out. Such leakage of the coolant to the outside of the machine is completely prevented by the caulking.

[0012] Since the liquid splash prevention plate has the above characteristics, according to the machine tool cover device according to this invention, it is possible to prevent the coolant from leaking outside the machine without using a packing.

[0013] The liquid leakage prevention plate is formed by overlapping and welding a first flat plate that adheres to both sheet metal covers and a second flat plate that adheres to the first flat plate so that their respective ends protrude, and the surface of the first flat plate facing the both sheet metal covers is the contact surface, and the surface of the end portion of the second flat plate protruding from the overlapping portion facing the first sheet metal cover and the end surface of the first flat plate continuous therewith may be the gutter forming surface.

[0014] In this way, the liquid leakage prevention plate can be manufactured only by welding two flat plates, the cover device for the machine tool can be simplified, and the manufacturing cost can be reduced.

[0015] Further, the liquid leakage prevention plate is formed by bending a single sheet metal at the middle portion, so that a first flat plate portion located on the side close to both sheet metal covers and a second flat plate portion connected to the first flat plate portion via the bent portion and located on the side far from both sheet metal covers are formed, and the surface of the first flat plate portion facing the both sheet metal covers is the contact surface, and the surface of the second flat plate portion facing the first sheet metal cover and the surface of the bent portion continuous therewith may be the gutter forming surface.

[0016] In this way, the liquid leakage prevention plate can be manufactured using a single flat plate, the cover device for the machine tool can be simplified, and the manufacturing cost can be reduced.

Advantages of the Invention

[0017] According to the cover device for the machine tool of this invention, it is possible to prevent the coolant from leaking outside the machine without using a packing, so that various problems associated with using a packing can be solved. Specifically, the work of attaching the packing, which may cause work mistakes such as gaps, distortions, peeling, and even forgetting to attach, can be eliminated, and claims due to liquid leakage can be prevented in advance. Also, the cost increase factors of the packing body can be eliminated, and further cost increase factors such as an increase in the number of assembly steps and the reattachment work during maintenance can be eliminated.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIGS. 1 and 2(a) show the first embodiment, and FIG. 2(b) shows the second embodiment. In the following description, the side facing the scattered coolant is referred to as the inside of the machine, and the opposite side is referred to as the outside of the machine. Also, regarding left and right, it refers to the left and right in each figure.

[0020] The cover device (1) for a machine tool in this embodiment is a cover device for preventing the coolant scattered in the machine tool from leaking outside the machine, and includes a first sheet metal cover (2) arranged on the left side, a second sheet metal cover (3) arranged on the right side adjacent to the first sheet metal cover (2), and a liquid leakage prevention plate (4) arranged from the outside of the machine of both sheet metal covers (2) and (3).

[0021] There is a slight gap between the two sheet metal covers (2) and (3), and the liquid leakage prevention plate (4) is made to cover this gap. The liquid leakage prevention plate (4) has a shape considering the blowing position of the coolant, and is formed asymmetrically rather than symmetrically with respect to the adjacent surface of the first sheet metal cover (2) and the second sheet metal cover (3).

[0022] In FIG. 1, it is assumed that the left first sheet metal cover (2) is arranged on the side closer to the blowing position of the coolant, and the right second sheet metal cover (3) is arranged on the side farther from the blowing position of the coolant.

[0023] In the case of such an arrangement, the high-pressure coolant blown out from the blowing position hits the adjacent surface of the first sheet metal cover (2) and the second sheet metal cover (3) from an oblique direction indicated by arrow A in Fig. 1. The scattered coolant is relatively likely to leak outside the machine from the side of the second sheet metal cover (3) arranged on the right side (the side far from the coolant blowing position), and is less likely to leak outside the machine from the side of the first sheet metal cover (2) arranged on the left side (the side close to the coolant blowing position).

[0024] The liquid leakage prevention plate (4) is composed of a first flat plate (11) that adheres to both sheet metal covers (2) and (3), and a second flat plate (12) that adheres to the first flat plate (11) from the side away from both sheet metal covers (2) and (3).

[0025] The first flat plate (11) and the second flat plate (12) are shifted and welded so that the second flat plate (12) approaches the coolant blowing position. As a result, an overlapping portion (13) where both flat plates (11) and (12) are overlapped is formed, and the right end portion (11a) of the first flat plate (11) and the left end portion (12a) of the second flat plate (12) project from the overlapping portion (13). The left end face (the end face of the left end portion (11b) of the first flat plate (11)) of the overlapping portion (13) is located on the outside of the machine of the first sheet metal cover (2), and the right end face (the end face of the right end portion (12b) of the second flat plate (12)) of the overlapping portion (13) is located on the outside of the machine of the second sheet metal cover (3).

[0026] The liquid leakage prevention plate (4) is fixed to the second sheet metal cover (3) by welding the first flat plate (11) to the second sheet metal cover (3), and is fixed to the first sheet metal cover (2) by a screw member such as a bolt (shown as having a hexagonal hole (5a) for a hexagonal wrench) (5). The part of the first flat plate (11) that is welded to the second sheet metal cover (3) is the right end portion (11a) and its vicinity. The screw member (5) is screwed into a female screw portion (13a) provided in the overlapping portion (13) of the first flat plate (11) and the second flat plate (12).

[0027] A caulking (6) for preventing liquid leakage is provided between the right end portion (11a) of the first flat plate (11) and the second sheet metal cover (3), and a caulking (6) for preventing liquid leakage is also provided between the right end portion (12b) of the second flat plate (12) and the first flat plate (11).

[0028] Since the left end portion (12a) of the second flat plate (12) is made to project from the overlapping portion (13), a gap (G) is formed between this end portion (12a) and the first sheet metal cover (2). The gap (G) has the function of a gutter that guides the coolant that has oozed out from the adjacent surface downward.

[0029] According to the above liquid leakage prevention plate (4), the surface of the first flat plate (11) facing the two sheet metal covers (2) and (3) is a close contact surface (4a) that is in close contact with the two sheet metal covers (2) and (3) to minimize the leakage of the coolant. Also, the surface of the left end portion (12a) of the second flat plate (12) facing the first sheet metal cover (2) and the end surface of the left end portion (11b) of the first flat plate (11) are gutter forming surfaces (4b) for forming a gutter that guides the coolant that has slightly leaked out from the close contact surface (4a) downward to prevent it from leaking outside the machine. And, as described above, a caulking (6) is provided between the right end portion (11a) of the first flat plate (11) of the liquid leakage prevention plate (4) and the second sheet metal cover (3).

[0030] Therefore, according to the machine tool cover device (1) of the first embodiment, the coolant that hits the adjacent surface of the first sheet metal cover (2) and the second sheet metal cover (3) from the diagonal direction indicated by the arrow A in FIG. 1 first has extremely little leakage to the outside of the machine by the close contact surface (4a) of the liquid leakage prevention plate (4). In terms of the scattering direction of the coolant, although the possibility of leakage from the right end portion (11a) of the first flat plate (11) is relatively large, since caulking (6) is provided here, there is no leakage to the outside of the machine. And, since the coolant leakage from the left end portion (11b) of the first flat plate (11) has no leftward momentum, it is guided downward by the gutter forming surface (4b) of the liquid leakage prevention plate (4) and collected at the lower end of the gutter, and there is no leakage to the outside of the machine.

[0031] Thus, according to the machine tool cover device (1) of the first embodiment, leakage of the coolant reaching the gap between the two sheet metal covers (2) and (3) to the outside of the machine is surely prevented.

[0032] In the above first embodiment, the liquid leakage prevention plate (4) is composed of two flat plates (11) and (12) welded to each other. However, as a second embodiment, the liquid leakage prevention plate (7) can also be obtained by using a single sheet metal and bending it at the middle part.

[0033] As shown in FIG. 2(b), the machine tool cover device (1) of the second embodiment includes a first sheet metal cover (2) arranged on the left side, a second sheet metal cover (3) arranged on the right side adjacent to the first sheet metal cover (2), and a liquid leakage prevention plate (7) arranged from the outside of the machine of both sheet metal covers (2) and (3).

[0034] Hereinafter, only the liquid leakage prevention plate (7) different from the first embodiment will be described.

[0035] The liquid leakage prevention plate (7) includes a first flat plate portion (21) and a second flat plate portion (22) connected to the first flat plate portion (21) via a bent portion (23). The first flat plate portion (21) is in close contact with both sheet metal covers (2) and (3), and the second flat plate portion (22) is located away from both sheet metal covers (2) and (3) to the outside of the machine.

[0036] The left end portion (21a) of the first flat plate portion (21) is located outside the machine of the first sheet metal cover (2), and the right end portion (21b) of the first flat plate portion (21) is located outside the machine of the second sheet metal cover (3).

[0037] The liquid leakage prevention plate (7) is fixed to the second sheet metal cover (3) by welding a portion of the first flat plate portion (21) except the left end portion (21a) to the second sheet metal cover (3). Also, the left end portion (21a) of the first flat plate portion (21) is fixed to the first sheet metal cover (2) by a screw member such as a bolt (shown as having a hexagonal hole (8a) for a hexagonal wrench) (8).

[0038] A caulking (9) for preventing liquid leakage is provided between the right end portion (21b) of the first flat plate portion (21) and the second sheet metal cover (3).

[0039] Since the second flat plate portion (22) is located away from the outside of the machine from both sheet metal covers (2) and (3), a gap (G) is formed between the second flat plate portion (22) and the first sheet metal cover (2). The gap (G) has the function of a gutter that guides the coolant oozing out from the adjacent surface downward.

[0040] According to the liquid leakage prevention plate (7) of the second embodiment, the surface of the first flat plate portion (21) facing both sheet metal covers (2) and (3) is a close contact surface (7a) that closely contacts both sheet metal covers (2) and (3) and minimizes the leakage of coolant. Also, the surface of the second flat plate portion (22) facing the first sheet metal cover (2) and the surface of the bent portion (23) continuous with this surface are gutter forming surfaces (7b) for forming a gutter that guides the coolant slightly leaking out from the close contact surface (7a) downward and prevents it from leaking outside the machine. And, as described above, caulking (9) is provided between the right end portion (21b) of the first flat plate portion (21) of the liquid leakage prevention plate (7) and the second sheet metal cover (3).

[0041] Therefore, according to the machine tool cover device (1) of the second embodiment, the coolant hitting the adjacent surface of the first sheet metal cover (2) and the second sheet metal cover (3) from the oblique direction indicated by the arrow A in FIG. 1 first has extremely little leakage to the outside of the machine by the close contact surface (7a) of the liquid leakage prevention plate (7). From the scattering direction of the coolant, the possibility of leakage from the right end portion (21b) of the first flat plate portion (21) is relatively large, but since caulking (9) is provided here, there is no leakage to the outside of the machine. And, since the coolant leakage from the left end portion (21a) of the first flat plate portion (21) has no momentum in the left direction, it is guided downward by the gutter forming surface (7b) of the liquid leakage prevention plate (7) and collected at the lower end of the gutter, and there is no leakage to the outside of the machine.

[0042] Thus, according to the machine tool cover device (1) of the second embodiment, leakage of coolant reaching the gap between the two sheet metal covers (2) and (3) to the outside of the machine is surely prevented.

Explanation of Signs

[0043] (1): Machine tool cover device (2): First sheet metal cover (3): Second sheet metal cover (4): Liquid leakage prevention plate (4a): Contact surface (4b): Groove forming surface (5): Screw member (6): Caulking (7): Liquid leakage prevention plate (7a): Contact surface (7b): Groove forming surface (8): Screw member (9): Caulking (11): First flat plate (12): Second flat plate (13): Overlapping portion (21): First flat plate portion (22): Second flat plate portion (23): Bent portion (G): Gap A: Arrow

Claims

1. A cover device for preventing coolant scattered in a machine tool from leaking outside the machine. The cover device includes a first sheet metal cover disposed on the side closer to the coolant blowing position, a second sheet metal cover disposed on the side farther from the coolant blowing position adjacent to the first sheet metal cover, and a liquid leakage prevention plate disposed from the outside of the machine of both sheet metal covers, fixed to the second sheet metal cover by welding, and fixed to the first sheet metal cover by a screw member. The liquid leakage prevention plate includes a contact surface that contacts both sheet metal covers and covers a gap between the two sheet metal covers, and a gutter forming surface provided so as to be continuous with the contact surface and forming a gutter for guiding the coolant downward between the liquid leakage prevention plate and the first sheet metal cover. A caulking for preventing liquid leakage is applied to an end portion of the liquid leakage prevention plate located on the second sheet metal cover side. A cover device for a machine tool is characterized by this.

2. The liquid leakage prevention plate is formed by overlapping and welding a first flat plate that contacts both sheet metal covers and a second flat plate that contacts the first flat plate so that their respective ends protrude. The surface of the first flat plate facing both sheet metal covers is the contact surface, and the surface of the end portion of the second flat plate protruding from the overlapping portion facing the first sheet metal cover and the end surface of the first flat plate continuous therewith are the gutter forming surfaces. The cover device for a machine tool according to claim 1 is characterized by this.

3. The liquid leakage prevention plate is formed by bending a single sheet metal at an intermediate portion, so that a first flat plate portion located closer to both sheet metal covers and a second flat plate portion connected to the first flat plate portion via the bent portion and located farther from both sheet metal covers are formed. The surface of the first flat plate portion facing both sheet metal covers is the contact surface, and the surface of the second flat plate portion facing the first sheet metal cover and the surface of the bent portion continuous therewith are the gutter forming surfaces. The cover device for a machine tool according to claim 1 is characterized by this.

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