JP2009248263A - Protective cover for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective cover for machine tools, which is excellent in sliding performance, elasticity, wear resistance and mechanical strength, and comprises a long-life wiper member or a flexible member such as splash guard and the like. <P>SOLUTION: The protective cover for the machine tools covers or is installed to enclose a machine tool or moving parts thereof, and comprises cover elements 1 sliding to other members. At least the cover elements 1 or the other members are provided with the wiper member 2 which is mounted to the sliding parts and blocks a gap between the two members, and a sliding section 4 having ultrahigh molecular weight polyethylene connected to net-like glass fiber at least on the side of a sliding surface 3a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a protective cover for a machine tool suitable for, for example, a telescopic cover and a splash guard.

  Conventionally, a protective cover called a telescopic cover is attached to protect a ball screw of a machine tool such as a machining center or boring machine or a sliding surface of a machine tool body. This telescopic cover is composed of a plurality of cover elements that overlap each other, and each cover element expands and contracts as the body of the telescope slides due to the movement of the machine tool, and sweeps cutting waste and cutting fluid from above the cover. It is removed and protected so that cutting waste and cutting fluid do not adversely affect the ball screw and sliding surface.

  In this telescopic cover, for example, as described in Patent Document 1, in order to remove cutting waste and cutting fluid from the cover, a member called a wiper is assembled to each cover element so that the cutting waste and cutting fluid can be more concentrated. Trying to remove it cleanly. Various materials are used as the material of the wiper member, and the material varies depending on the machine tool manufacturer, the cover manufacturer, the model, etc., but generally rubber such as urethane rubber or NBR, or thin plate such as SK material. Often a metal plate is used.

  In Patent Document 1, the inventors have proposed a technique in which a material obtained by impregnating a glass fiber with a heat-resistant synthetic resin such as tetrafluoroethylene resin is used as a wiper material. With this technique, a wiper member with improved wear resistance and resistance is obtained and is currently used in many machine tools.

  Conventionally, machine tools such as machining centers have been provided with a protective cover called a splash guard that is attached so as to surround the machine body for the purpose of safety and to prevent cutting waste and cutting fluid from going outside. Yes. This splash guard generally has a sheet metal structure, and even when the operator door is closed, a gap is generated between the movable part of the operator door and the cover body, so a sheet called splash proofing is used to close the gap. A brush made of bundled rubber such as NBR, nylon, or polypropylene fiber is attached. By preventing the splash, cutting waste and cutting fluid are prevented from leaking from the gap to the outside of the cover.

JP 2005-246490 A

The following problems remain in the conventional technology.
That is, with the diversification and higher performance of machine tools in recent years, the wiper member of the telescopic cover is also required to withstand higher speed and longer life and to have higher performance.
The wiper member is used repeatedly by sliding hundreds of thousands of times and millions of times, and it varies depending on the work material and cutting conditions, but the high-temperature cutting waste becomes a shape like a cutting blade, It is used in a very harsh environment where it is contacted in such a state that it suffers wear due to sliding or damage due to cutting waste.

  In addition, sealability is necessary to remove cutting chips and cutting fluid from the cover and prevent them from dropping to the back side as much as possible. Abrasion is required. Furthermore, when scraps or cutting fluid adheres, a scraper having a function of scraping them off is also required. In addition, in order to receive the load of the cover, various characteristics such as mechanical strength, elasticity, followability, and recoverability are required, and resistance to the cutting fluid is also required.

  In addition, the cover made by sheet metal processing is manufactured flat, but in reality, some unevenness has occurred, and in order to seal cutting waste and cutting fluid entering between the cover and the wiper member, followability and elasticity against the unevenness Sex is required. Conventionally, rubber materials such as urethane rubber and NBR, which are used as a material for wiper members, are relatively excellent in followability and elasticity, but have a large friction coefficient and are inferior in slipperiness, causing stick slip. In some cases, the wiper member may turn up.

In addition, when a thin metal such as SK material is used, the scraper property for removing the scraped powder and the mixture of cutting fluid that adheres to the cover and adheres to the cover is removed. Although it is superior to a rubber material, it wears due to repeated friction between metals. As this wear progresses, the friction surface becomes sharp like a blade, and handling that fully considers the safety of the operator is necessary during replacement work, which is inconvenient in handling and maintenance.
In addition, the material in which the glass fiber proposed in Patent Document 1 is impregnated with tetrafluoroethylene resin has an advantage that the friction coefficient is small and the sliding resistance is small, but it is used in a more severe environment in recent years. In view of the above, a material having further improved wear resistance, mechanical strength and the like is desired.

  Further, the wiper member ideally supports the weight of the cover while sliding with the cover, and slides while maintaining the designed dimensions on the cover. The force that supports the weight of the cover at this time is called lip force. The setting of this lip force is delicate, and there are cases where the rigidity of the wiper member is too large and the followability and elasticity are insufficient, or the rigidity of the wiper member is too low to support the weight of the cover. End up. Further, the lip force varies depending on the size and weight of the cover, and also varies depending on the position of the cover. Further, it varies depending on the expansion / contraction state of the cover. In the extended state, the wiper member receives almost its own weight, but in the contracted state, the weight of the cover overlapping the upper portion is also added. Thus, the wiper member is also required to have an appropriate lip force corresponding to the cover.

On the other hand, in recent years, due to the diversification and higher performance of machine tools and environmental considerations such as oil leaks, the splash guard is better sealed against splashing, has a longer service life, and is movable when moving. There is a demand for higher performance such as those with low dynamic resistance.
Conventionally, a rubber material used for preventing splashes has a large coefficient of friction, so that there is a large resistance when the operator door is manually opened, and there is a disadvantage that a large force is required for opening and closing. In addition, in the case of a brush, it is expensive and is bent in one direction with a long pause, leaving a habit in that direction, or reversing and reversing to move the hair part easily, Since a kind of deterioration is likely to occur, there is a disadvantage that the life is short. When such deterioration occurs, it is not preferable from an environmental point of view, for example, the sealing performance is lowered and oil leaks to the periphery.

  The present invention has been made in view of the above-described problems, and is excellent in slipperiness but also excellent in elasticity, wear resistance, mechanical strength, etc., and has a long life, such as a wiper member or splash-proof flexibility. It aims at providing the protective cover for machine tools which has a member.

  The present invention employs the following configuration in order to solve the above problems. That is, the protective cover for machine tools of the present invention is a protective cover for machine tools provided with a cover member that covers or surrounds the machine tool or its movable part and slides against other members. And at least one of the cover member and the other member includes a flexible member that is attached to the sliding portion and closes a gap between the two members, and the flexible member is bonded to the glass fiber. It has a sliding part in which the ultra-high molecular weight polyethylene is arranged on at least the sliding surface side.

  In this protective cover for machine tools, the flexible member has a sliding part in which ultra high molecular weight polyethylene bonded to glass fiber is disposed at least on the sliding surface side, so that the low coefficient of friction is reduced by ultra high molecular weight polyethylene. In addition to being excellent in wear resistance and fracture resistance, it is possible to add flexibility and rigidity that cannot be obtained with ultrahigh molecular weight polyethylene alone by glass fibers. That is, a low sliding resistance due to a low friction coefficient, a long life due to high wear resistance and fracture strength, a sealing property due to high elasticity and followability, and a high scraper property can also be obtained. Thus, it becomes possible by combining ultra high molecular weight polyethylene and glass fiber to have both characteristics. In the present invention, the ultrahigh molecular weight polyethylene is directly bonded to the glass fiber, and the ultrahigh molecular weight polyethylene is arranged on the sliding surface side, so that the glass fiber is slid like the conventional technique in which the ultrahigh molecular weight polyethylene is impregnated. The glass fiber is not exposed on the surface of the moving surface side, and the surface becomes only the ultra-high molecular weight polyethylene having a high slip property, which can improve the lower sliding resistance, wear resistance, mechanical strength, etc. .

  In the protective cover for machine tools of the present invention, the sliding portion is formed by joining ultrahigh molecular weight polyethylene to a glass cloth made of glass fibers knitted in a mesh shape. That is, in this protective cover for machine tools, the sliding portion is made by joining ultrahigh molecular weight polyethylene to a glass cloth made of glass fibers knitted in a mesh shape. A sliding part is obtained.

  Moreover, the protective cover for machine tools of this invention is provided with the support part formed with the rubber material which the said flexible member joined to the said sliding part, and supports this. That is, in this protective cover for machine tools, since the flexible member is provided with a support portion formed of a rubber material joined to and supporting the sliding portion, the elasticity and resilience of the rubber material are further provided. In addition, the support portion of the rubber material receives the high-temperature cutting waste and can improve the heat resistance.

  The protective cover for a machine tool according to the present invention is characterized in that the sliding portion and the support portion are each formed in a sheet shape and joined to each other in a laminated state. That is, in this protective cover for machine tools, the sliding part and the support part are each formed in a sheet shape and are joined to each other in a laminated state, so characteristics such as flexibility and rigidity can be easily obtained by the respective layer thicknesses. Can be set.

  Further, the protective cover for a machine tool of the present invention is a telescopic cover having a plurality of cover elements that are telescopically combined as the cover member and having a wiper member as the flexible member. It is characterized by. That is, this machine tool protective cover is a telescopic cover having a cover element of a cover member and a wiper member of a flexible member, so that it has slipperiness, wear resistance, elasticity, followability, sealability, lip A wiper member having excellent characteristics such as force (force that supports the weight of the cover) is obtained.

  Moreover, the protective cover for machine tools of this invention is a splash guard which has a door part which can be opened and closed as said cover member, and has splash prevention as said flexible member. That is, this machine tool protective cover is a splash guard having a cover member door portion and a flexible member splash proof, so it has characteristics such as slipperiness, wear resistance, sealability, and chemical resistance. Excellent splash protection is obtained.

The present invention has the following effects.
That is, according to the protective cover for machine tools according to the present invention, the flexible member includes a sliding portion in which ultrahigh molecular weight polyethylene bonded to glass fiber is disposed at least on the sliding surface side. A synergistic effect of high molecular weight polyethylene and glass fiber can provide a long-life wiper member that has all of slipperiness, abrasion resistance, resilience, followability, sealing properties, scraper properties, lip properties, etc. it can. As a result, it is possible to reduce the load of vibration and resistance applied to the machine tool body, and it is possible to cope with higher accuracy and higher speed of the machine tool. In particular, it is suitable for a telescopic cover having a wiper member that requires the above characteristics and a splash guard having splash protection.

  Hereinafter, a first embodiment of a protective cover for a machine tool according to the present invention will be described with reference to FIGS. 1 to 3.

  As shown in FIG. 1, the protective cover for a machine tool of the present embodiment has a plurality of cover elements (cover members) 1 that are combined in a nested manner to be extendable and are wiper attached to the cover element 1. A telescopic cover having a member (flexible member) 2. The protective cover for machine tools according to the present embodiment is a horizontal mountain-shaped telescopic cover, but may be adopted as, for example, a horizontal type, a vertical type, a horizontal type, or the like having different stretching directions and shapes. In addition, as a machine tool, for example, a machining center, boring machine, grinding machine, lathe, drilling machine or milling machine can be applied, and as a movable part, a movable part of a machine tool head or a slide table can be applied. It is.

The protective cover for a machine tool is installed so as to cover a movable part (not shown) of the machine tool, and includes a plurality of the cover elements 1 that overlap each other and slide with respect to the other cover elements 1.
As shown in FIG. 2, the cover element 1 includes a cover main body 3 and a wiper member 2 attached to the sliding portion of the cover main body 3.
The cover body 3 is formed by bending a metal plate such as a stainless steel plate into a mountain shape.

The wiper member 2 has a side edge of the cover main body 3 so as to close a gap between the cover main bodies 3 which are combined in a nested manner in order to scrape off cutting waste or cutting fluid scattered or dropped on the upper surface of the cover main body 3. It is installed along the section.
The wiper member 2 includes a sheet-like sliding portion 4 in which ultra high molecular weight polyethylene bonded to glass fiber is disposed on at least the sliding surface 3a side.

As shown in FIG. 3, the sliding portion 4 is formed by combining an ultrahigh molecular weight polyethylene sheet 4a and a glass fiber sheet 4b by bonding.
As the glass fiber sheet 4b, a glass cloth in which glass fibers are knitted in a mesh shape is employed.
The ultra high molecular weight polyethylene of the sliding portion 4 is generally a high molecular weight polyethylene having an average molecular weight of 1,000,000 or more, and in the present embodiment, for example, one having an average molecular weight of 5.5 million is used. Such ultra-high molecular weight polyethylene exhibits physical properties different from those of ordinary polyethylene, and has particularly excellent low friction coefficient, wear resistance, slipperiness, appropriate rigidity and flexibility.

  Further, this ultra high molecular weight polyethylene is resistant to many acids, alkalis and solvents, and has excellent chemical resistance. Cutting fluids used in machine tools include oil-based cutting agents and water-soluble cutting agents, and there are many types depending on the components. Some of these cutting fluids dissolve or deteriorate some plastics. However, the present inventors have confirmed that the ultra-high molecular weight polyethylene used for the sliding portion 4 does not deteriorate even when immersion life experiments are performed on several types of representative cutting fluids.

  By selecting an appropriate thickness, the glass fiber sheet 4b can increase the rigidity of the ultrahigh molecular weight polyethylene sheet 4a and can also have an appropriate flexibility. In addition, by combining with the ultrahigh molecular weight polyethylene sheet 4a, it is possible to follow, improve the sliding property and wear resistance, and obtain a high scraper property.

  In addition, as the above-mentioned compounding method, both sides of a 0.25 mm thick glass fiber sheet 4b knitted in a mesh shape are sandwiched between, for example, an ultrahigh molecular weight polyethylene sheet 4a having a thickness of 0.12 mm, and both ultrahigh molecular weight polyethylene sheets are used. A method of joining by hot pressing so that 4a enters and joins the mesh of the glass fiber sheet 4b is used. In addition, you may employ | adopt another method as a method of joining ultra high molecular weight polyethylene and glass fiber.

  For example, since ultra high molecular weight polyethylene is relatively difficult to mold and bond, a thin plastic film that is easy to bond is disposed on both sides of the glass fiber sheet 4b, and the ultra high molecular weight polyethylene sheet 4a is disposed on one side of the glass fiber sheet 4b for heat pressure bonding. May be. In this case, adhesion between the meshes of the glass fiber sheet 4b is performed with a thin plastic film that can be easily joined, so that the ultrahigh molecular weight polyethylene and the glass fiber are joined via the plastic film.

  In addition, since the required lip force differs depending on the position of the cover element 1 incorporated in a nested manner, the thickness of the glass fiber sheet 4b and the ultrahigh molecular weight polyethylene sheet 4a in the sliding portion 4 varies depending on each cover element 1. It doesn't matter.

  The wiper member 2 is disposed with a plate-like spacer 7 between the holder 6 and the cover body 3 and is fixed to the cover body 3 with a flat head screw 8. The spacer 7 serves to reinforce and protect the wiper member 2 and is set to be narrower than the sliding portion 4 and is shorter than the sliding portion 4 and protrudes from the cover body 3 in the sliding direction. It is fixed. The spacer 7 is bent at a predetermined angle toward the sliding surface 3a.

  As described above, in the protective cover for machine tools of the present embodiment, the wiper member 2 is configured by the sliding portion 4 in which the ultra high molecular weight polyethylene bonded to the mesh-like glass fiber is arranged on at least the sliding surface 3a side. Therefore, the ultrahigh molecular weight polyethylene is excellent in low coefficient of friction, wear resistance, and fracture strength, and the network-like glass fiber can add flexibility and rigidity that cannot be obtained by the ultrahigh molecular weight polyethylene alone.

That is, a low sliding resistance due to a low friction coefficient, a long life due to high wear resistance and fracture strength, a sealing property due to high elasticity and followability, and a high scraper property can also be obtained. Thus, it becomes possible by combining ultra high molecular weight polyethylene and glass fiber to have both characteristics.
In particular, since the sliding portion 4 is formed by joining ultrahigh molecular weight polyethylene to a glass cloth in which glass fibers are knitted in a mesh shape as the glass fiber sheet 4b, the sheet-like sliding having a high bonding strength is caused by the mesh of the glass cloth. Part is obtained.

  Next, a second embodiment of the machine tool protective cover of the present embodiment will be described with reference to FIG. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, the wiper member 2 is composed of only the sheet-like sliding portion 4 and is attached to the cover body 3, whereas the second embodiment is different from the second embodiment. In the protective cover for machine tools of the embodiment, as shown in FIG. 4, the wiper member 22 is provided between the sliding portion 4 disposed on the sliding surface 3 a side, and between the sliding portion 4 and the cover body 3. And a support portion 25 formed of a rubber material that is joined to and supported by the sliding portion 4.

That is, in 2nd Embodiment, the sheet-like sliding part 4 and the sheet-like support part formed in the same width are mutually joined in the lamination | stacking state.
The rubber material forming the support portion 25 is, for example, NBR (nitrile rubber), urethane rubber, or the like, and NBR is used in this embodiment. For example, the support portion 25 that is an NBR sheet and the sliding portion 4 that is a composite sheet of an ultrahigh molecular weight polyethylene sheet and a glass fiber sheet are joined together by heat pressure welding and integrated.
In addition, you may join the sheet-like sliding part 4 and the support part 25 with an adhesive agent.

Thus, in the protective cover for machine tools of the second embodiment, the wiper member 22 includes the support portion 25 formed of a rubber material that is joined to and supports the sliding portion 4. The resilience and resilience of the rubber material can be added, and the heat-resistant cutting waste can be received by the support portion of the rubber material to improve the heat resistance.
For joining the sliding part 4 and the rubber support part 25, a high surface strength can be obtained by applying a special surface treatment to the joint surface, such as etching the joint surface with chemicals or sandblasting. It is preferable to obtain it.

  That is, the sliding portion 4 containing ultra high molecular weight polyethylene has a role such as slipperiness, friction resistance, scraper property, etc., and the rubber support portion 25 adjusts resilience, followability and lip force. Each has a role and shares functions. Thus, a hybrid wiper member having both characteristics can be obtained by joining the ultrahigh molecular weight polyethylene and the rubber material.

Furthermore, since high-temperature cutting waste may directly hit the wiper member 22, it is preferable that the heat resistance is high. In this regard, although the ultra-high molecular weight polyethylene itself contained in the sliding portion 4 does not have high heat resistance, the rubber support portion 25 is joined to the surface directly hit by the cutting waste, so that the sliding portion 4 is formed. Since it protects, sufficient heat resistance can be obtained as the entire wiper member 22.
Moreover, since the sliding part 4 and the support part 25 are each formed in a sheet shape and joined to each other in a laminated state, characteristics such as flexibility and rigidity can be easily set by the thickness of each layer.

  Next, a third embodiment of the machine tool protective cover of the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 5 to 7, the protective cover for a machine tool of the present embodiment has a pair of operator doors (cover members, door portions) 41 that can be opened and closed and a splash guard attached to the splash guard main body 43 side ( A splash guard having a flexible member 42. In the splash guard, a central portion of a box-type splash guard main body 43 surrounding the machine tool can be opened and closed by a pair of operator doors 41. That is, as shown in FIGS. 5 to 9, the pair of operator doors 41 is slidably attached to the splash guard main body 43 by the guide rollers 49 and the guide rails 50.

The operator door 41 includes a door main body 46 and a splash proof 42 attached to a portion of the door main body 46 that slides with the splash guard main body 43.
The splash protection 42 is fixed to the end of the opening of the splash guard main body 43 with a screw (not shown) through a pressing plate 47. The splash guard 42 is set to have a protruding width that can close the gap between the splash guard main body 43 and the operator door 41, and is attached so that the upper portion contacts the lower surface (sliding surface 41 a) of the operator door 41. Yes. That is, when the operator door 41 slides with respect to the splash guard main body 43 and opens and closes, the splash protection 42 slides on the operator door 41.

  As shown in FIG. 8, the splash proof 42 is composed of a sheet-like sliding portion 44 in which ultrahigh molecular weight polyethylene bonded to a mesh-like glass fiber is arranged on at least the sliding surface 41a side. As in the first embodiment, the sliding portion 44 is formed by joining an ultrahigh molecular weight polyethylene sheet on both sides of a glass fiber sheet knitted in a mesh shape to form a composite.

That is, the glass fiber sheets are joined together in a state where a pair of ultrahigh molecular weight polyethylene sheets are sandwiched, and when the upper part of the splash proof 42 is bent and comes into contact with the sliding surface 41a of the operator door 41, in any direction Even if it bends, the surface formed of ultra high molecular weight polyethylene is arranged on the sliding surface 41a side.
The sliding portion 44 is made of the same material as that of the first embodiment and is formed by the same manufacturing method.

  In addition to the function of preventing cutting waste and cutting fluid from leaking to the outside of the splash guard main body 43 during processing when the operator door 41 is closed, the splash proof 42 has a ceiling portion (sliding surface) of the operator door 41. 41a) has a function of scraping off cutting waste and cutting fluid on the ceiling so that the cutting waste and cutting fluid adhering to 41a) and the like do not fall from the ceiling when the operator door 41 is opened. With this function, it is possible to prevent cutting waste and cutting fluid from dripping from the ceiling when an operator who has opened the operator door 41 enters the splash guard.

  The operator door 41 may have irregularities, but the splash protection 42 must bend following the irregularities. When a conventional brush is used to prevent splashing, each fiber has flexibility, so it follows the unevenness of the operator door. However, when only rubber is used, the operator has flexibility. If there is a convex part on the door, there is a disadvantage that resistance increases at the convex part. However, in the present embodiment, the splash protection 42 is constituted by the sliding portion 44 having the formation surface of the ultra high molecular weight polyethylene facing the sliding surface 41 a side of the operator door 41, and thus the convex portion of the operator door 41. The resistance due to is greatly reduced.

  The sliding part 44, which is a composite of ultrahigh molecular weight polyethylene and glass fiber, is too thick, so that the flexibility is lowered, so that it can be soft enough to follow the convex part, but it can be broken even in the Izod impact test. It has the property that it does not, has high wear resistance, and can obtain sufficient characteristics in the form of a thin film.

  In addition, due to the sheet metal accuracy of the splash guard, the splash guard 42 is not a structure that is attached so as to be in contact with the operator door 41 in a vertical direction, and there are about 20 mm when the gap between the cover body 3 and the operator door 41 is large. The distance changes as the operator door 41 moves. For this reason, in this embodiment, as shown in FIG. 8, the splash protection 42 is attached with the width | variety which has the margin with respect to the said clearance gap.

  In this state, when the operator door 41 is reciprocated, that is, when the operator door 41 is moved in the arrow A direction shown in FIG. 9A and in the arrow B direction shown in FIG. 9B. When the operator door 41 is moved, the tip of the splash protection 42 is reversed and slides in a different direction. Therefore, since both surfaces of the splash protection 42 slide, the ultrahigh molecular weight polyethylene sheet joined to both sides of the glass fiber sheet slides to reduce the resistance in either of the opening and closing operations.

  Thus, in the splash guard which is the protective cover for the machine tool of the fourth embodiment, the splash proof 42 is composed of the sliding portion 44 in which the glass fiber and the ultrahigh molecular weight polyethylene are joined. The anti-splash 42, which has excellent properties such as wear resistance, sealability, and chemical resistance, can reduce the load of vibration and resistance applied to the machine tool body, and increase the accuracy and speed of the machine tool. It becomes possible to respond to the conversion.

  Note that machine tools are used in environments where drying and moisture are repeated, such as when the operation is stopped during long holidays, and when cutting fluid such as dry cutting or wet cutting is used or not used. Therefore, in the case of splash protection using a conventional rubber material, the rubber material may deteriorate in a short time. However, since the splash guard of the present embodiment employs the splash protection 42 that is the sliding portion 44 in which the ultrahigh molecular weight polyethylene and the glass fiber are joined, it is an environment in which drying and moisture are repeated. However, there is less deterioration than in the prior art and a long life can be obtained.

  In addition, you may employ | adopt what joined the support part of the rubber sheet to the sliding part 44 like the said 2nd Embodiment as splash prevention. In this case, as described above, in consideration of the reciprocating motion of the operator door 41, it is preferable to join the sliding portions 44 on both sides of the support portion of the rubber sheet to form a sandwich structure. You may join the sheet-like sliding part 44 only to either one surface of the support part which is a sheet | seat. In this case, the sliding portion 44, which is a composite sheet of ultrahigh molecular weight polyethylene and glass fiber, is only required for one side, and the member cost can be reduced.

  However, in this case, when the operator door 41 is opened, it is preferable to join the sliding portion 44 of the composite sheet to a surface where the sliding portion 44 contacts the sliding surface 41a of the operator door 41. That is, at least when the operator door 41 is opened, the splash protection is slid on the sliding portion 44 side of the ultra-high molecular weight polyethylene sheet, thereby staying and adhering to the ceiling portion (sliding surface 41a) of the operator door 41. It is possible to scrape off the cut scraps and cutting fluid and prevent them from dripping from the ceiling.

In addition, in the case of splash protection only with a sheet-like rubber material as in the past, it is difficult to keep the whole flat, and when using a rubber material such as NBR, undulations such as wrinkles are likely to occur. There is a disadvantage that cutting fluid leaks from the gap. However, in the splash protection in which the sliding portion 44 is joined to the support portion of the rubber material in the above embodiment, since the sliding portion 44 is obtained by joining ultrahigh molecular weight polyethylene to glass fiber, Due to the rigidity, almost no waviness like wrinkles occurs in the splash protection 42, and leakage of the cutting fluid can be greatly suppressed.
Since the rigidity can be improved by combining the ultrahigh molecular weight polyethylene and the glass fiber as described above, it is preferable to set the thickness of the sliding portion 44 so as to obtain a rigidity that does not cause wrinkles.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in each of the embodiments described above, the present invention is applied to a telescopic cover and a splash guard as a protective cover for machine tools, but the present invention may be applied to protective covers for other machine tools.

In the protective cover for machine tools of 1st Embodiment which concerns on this invention, it is a perspective view which shows a telescopic cover. In the protective cover for machine tools of 1st Embodiment, it is an expanded sectional view which shows the wiper member of an attachment state. In the protective cover for machine tools of 1st Embodiment, it is a notional expanded sectional view which shows a sliding part. In the protective cover for machine tools of 2nd Embodiment which concerns on this invention, it is an expanded sectional view which shows the wiper member of an attachment state. In the protective cover for machine tools of 3rd Embodiment which concerns on this invention, it is a perspective view which shows the state which the operator door which shows a splash guard closed, and the open state. In the protective cover for machine tools of 3rd Embodiment, it is a perspective view which shows the splash guard of the state which cut | disconnected a part. In the protective cover for machine tools of 3rd Embodiment, it is a perspective view which shows the attachment part of splash prevention in the state which cut | disconnected a part. In the protective cover for machine tools of 3rd Embodiment, it is an expanded sectional view which shows the attachment part of splash prevention. In the protective cover for machine tools of 3rd Embodiment, it is sectional drawing which shows the state of splash prevention at the time of moving an operator door in the opening direction and the closing direction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cover element (cover member), 2 ... Wiper member (flexible member), 3 ... Cover main body, 3a, 41a ... Sliding surface, 4,44 ... Sliding part, 4a ... Ultra high molecular weight polyethylene sheet, 4b ... Glass fiber sheet, 5 ... Support part, 41 ... Operator door (door part, cover member), 42 ... Splash protection (flexible member), 43 ... Splash guard body

Claims (6)

A protective cover for a machine tool provided with a cover member that covers or surrounds the machine tool or its movable part and slides against other members,
At least one of the cover member and the other member includes a flexible member that is attached to the sliding portion and closes a gap between the two members,
A protective cover for a machine tool, wherein the flexible member includes a sliding portion in which ultra high molecular weight polyethylene bonded to glass fiber is disposed on at least a sliding surface side. In the protective cover for machine tools according to claim 1,
A protective cover for machine tools, wherein the sliding portion is formed by bonding ultrahigh molecular weight polyethylene to a glass cloth made of glass fibers knitted in a mesh shape. In the protective cover for machine tools according to claim 1 or 2,
A protective cover for a machine tool, wherein the flexible member includes a support portion formed of a rubber material joined to and supported by the sliding portion. In the protective cover for machine tools according to claim 3,
The protective cover for a machine tool, wherein the sliding portion and the support portion are each formed in a sheet shape and joined to each other in a laminated state. In the protective cover for machine tools as described in any one of Claim 1 to 4,
A protective cover for a machine tool, comprising: a telescopic cover having a plurality of cover elements that are telescopically combined as the cover member and having a wiper member as the flexible member. In the protective cover for machine tools as described in any one of Claim 1 to 4,
A protective cover for a machine tool, which is a splash guard having a door portion that can be opened and closed as the cover member and having splash protection as the flexible member.

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