KR102657943B1 - dual channel inner spraying module of minimum quantity lubrication for cutting tool - Google Patents

Abstract

The present invention is a dual-channel internal injection module that is detachably mounted on a non-hollow spindle and provides an internal injection structure. The upper end is coupled to the non-hollow spindle, and the cutting tool (E) is mounted at the lower end to rotate the spindle. Tool holder 100 rotated by; A cylinder 200 coupled to the outer peripheral surface of the tool holder via a bearing and supporting the rotating tool holder; and a fluid supply channel, the lower part of which is coupled to the outer peripheral surface of the cylinder to support the cylinder, the upper part of which is coupled to the external housing of the spindle, and which has a cutting oil supply channel through which cutting oil is supplied and an air supply channel through which air is supplied. Includes unit 300;

Description

Dual channel inner spraying module for minimum quantity lubrication for cutting tool}

The present invention relates to a module that enables internal injection of cutting oil into non-hollow shaft cutting tools, which are cutting tools that do not have a hollow part in the spindle device, and thus internal injection is impossible. Specifically, hollow shafts exist in existing machining center equipment, etc. In cases where this is not possible, it is about module equipment that allows the MQL method to be applied by attaching it to the outside of the standardized ATC spindle of existing equipment without replacing the dedicated spindle. In addition, the internal injection structure supplies cutting oil and air through separate channels. This relates to equipment that mixes and sprays it into a mist inside the tool holder.

Generally, when machining workpieces with machine tools such as lathes and milling, cutting is performed while supplying cutting oil to the machining area. This is due to lubrication and cooling, reduction of friction coefficient, chip removal, and processing of the machined surface. For this purpose, its types are largely divided into petroleum oil, soluble oil, mineral oil, and fatty oil. These cutting oils use different types of cutting oil depending on the rotational speed of the tool. Among the above cutting oils, water-soluble cutting oil with relatively low viscosity is appropriately used for high-speed cutting, while petroleum with high viscosity is used for low-speed cutting. This is the situation.

When the cutting oil is sprayed in liquid form, the consumption of cutting oil becomes too high and the cutting oil is not evenly applied to each part. To solve this problem, a cutting oil mist spray device (registered in Korea) is designed to spray the cutting oil by atomizing it. Utility Model No. 20-0349111) has been proposed.

In addition, as technology becomes more advanced, precise sensors, machines, and rigidity are required, and large amounts of waste cutting oil are used for lubrication of end mills, resulting in environmental and cost problems. To solve this problem, the MQL (minimum quantity lubrication) method is being newly considered. Unlike the high-pressure injection method of cutting oil, which uses tens of liters of coolant per hour, MQL is a method that reduces costs at hundreds of milliliters per hour and is also advantageous in terms of the environment. .

In this way, cutting fluid is supplied to the tip end of the end mill to lubricate it. There are two methods: spraying it from the outside and spraying it from the inside. Considering environmental issues, mechanical problems, and cost aspects, the MQL method is adopted and the coolant is sprayed inside the tool. The spraying method is advantageous.

However, in a conventional machining center, etc., when there is no hollow shaft inside the spindle, there is a problem in that cutting oil cannot be supplied into the tool holder, and therefore the internal injection method cannot be applied. To solve this problem, it is essential to change the equipment to a dedicated vertical injection spindle for applying MQL to existing commercial equipment. There was a problem of high installation costs for change, and also the existing spindle had to be removed and replaced with a new one. There were also problems such as a decrease in machine precision during the installation process.

Republic of Korea Registered Utility Model No. 20-0349111

In addition, the present invention provides a dual-channel MQL type internal injection device applicable to existing 'non-hollow shaft spindle' equipment, so that it can be used as a standardized ATC (Automatic Tool Changer) of existing equipment without replacing it with a dedicated spindle. ) The purpose is to enable the application of Thru-hole MQL at low cost by attaching the device according to the present invention to the outside of the spindle.

The present invention supplies cutting oil through a channel inside the spindle using the MQL method at the tip of a cutting tool such as an end mill, and adopts a dual-channel structure in which the channels through which air and cutting oil flow are different, spraying cutting oil at a precise point inside the channel. The purpose is to provide technology to prevent mist derived from cutting oil from sticking to.

The present invention is a dual-channel internal injection module that is detachably mounted on a non-hollow spindle and provides an internal injection structure. The upper end is coupled to the non-hollow spindle, and the cutting tool (E) is mounted at the lower end to rotate the spindle. Tool holder 100 rotated by; A cylinder 200 coupled to the outer peripheral surface of the tool holder via a bearing and supporting the rotating tool holder; and a fluid supply channel, the lower part of which is coupled to the outer peripheral surface of the cylinder to support the cylinder, the upper part of which is coupled to the external housing of the spindle, and which has a cutting oil supply channel through which cutting oil is supplied and an air supply channel through which air is supplied. Includes unit 300;

In the fluid supply channel unit 300, the cutting oil supply channel through which cutting oil is supplied and the air supply channel through which air is supplied are provided separately, so that the cutting oil and air are supplied independently of each other.

A separation space (a) exists between the outer peripheral surface of the tool holder and the cylinder, and an outer sealing member is provided in the separation space to seal the inside and outside. And, the separation space (a) includes a cutting oil space (a1) to which cutting oil is supplied by the cutting oil supply channel, and an air space (a2) to which air is supplied by the air supply channel.

In the separation space (a), the cutting oil space (a1) and the air space (a2) are separated from each other by an internal sealing member, so that the cutting oil and air are not mixed with each other in the separation space.

The cutting oil space a1 and the air space a2 each have a ring shape surrounding the outer peripheral surface of the tool holder and are spaced apart from each other in the vertical direction.

The tool holder 100 includes a mixing space 110 formed vertically directly above the cutting tool; A first passage 120 that communicates the mixing space 110 and the cutting oil space a1 and supplies cutting oil to the mixing space; And a second passage 140 that connects the mixing space 110 and the air space (a2) to supply air to the mixing space, and in the mixing space, cutting oil and air are mixed and turned into mist. .

The first passage is a plurality of passages formed radially in the ring-shaped cutting oil space (a1) toward the mixing space and spaced apart in the circumferential direction, and the second passage is formed in the ring-shaped air space (a2). It is a plurality of passages formed radially toward the mixing space and spaced apart from each other in the circumferential direction.

The mist formed in the mixing space is supplied to the bottom of the cutting tool along an internal flow passage formed inside the cutting tool, and a coupling member into which the cutting tool is inserted and fixed is disposed at the bottom of the tool holder.

The present invention has the advantageous effect of enabling internal injection in 'non-hollow shaft spindle' equipment, where application of the MQL method was very difficult, and also enabling internal injection in the dual-channel MQL method, due to the above configuration.

Figure 1 is a comparison between a single channel structure and a dual channel structure as a channel structure for supplying cutting oil to a cutting tool.
Figure 2 is a perspective view of a dual-channel internal injection module for a non-hollow shaft cutting tool according to the present invention;
Figure 3 is a longitudinal cross-sectional view of the internal injection module shown in Figure 2;
4 to 6 show components of a dual-channel internal injection module for a non-hollow shaft cutting tool according to the present invention,
Figure 7 is an example of an end mill having a cutting mist flow space inside as mounted on a dual-channel internal injection module for a non-hollow shaft cutting tool according to the present invention.

The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. Additionally, the terms used are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user operator. Therefore, definitions of these terms should be made based on the overall content of this specification.

Figure 1 is a comparison between a single channel structure and a dual channel structure as a channel structure for supplying cutting oil to a cutting tool.

The oil and compressed air are mixed before being supplied through the cutting tool to the workpiece/tool area. The oil and compressed air are then delivered through another channel and mixed in front of the cutting tool holder. However, in the single channel system shown at the top of FIG. 1, oil and compressed air are mixed outside the machine to generate mist. Afterwards, it moves a considerable distance of 2m until it reaches the tool.

Looking at the dual-channel system shown at the bottom of Figure 1, oil and compressed air move through different channels in the center of the spindle. The different channels through which oil and compressed air move are marked with different colors. Afterwards, they combine in the chamber at the back of the tool holder to form mist. The mist moves only the length of the tool holder and tool, moving a relatively short distance of approximately 0.2 m.

In the case of a single channel, the mist moves a long distance along the channel, and during this process, it adheres to the wall of the passage, reducing the lubrication effect. Therefore, a dual channel that generates mist inside the tool holder is advantageous.

The present invention provides such a dual-channel coolant supply structure, and in particular, a dual-channel type even for 'non-hollow shaft' cutting equipment that has no hollow part inside the spindle (corresponding to S in Figure 2 of the present invention) as existing equipment. This provides the effect of having an internal injection structure of. The present invention provides a device that can be attached and detached to existing non-hollow shaft spindle cutting equipment. In the following description, the device of the present invention for applying the MQL internal injection structure to non-hollow shaft cutting equipment is simply referred to as a 'dual channel internal injection module'.

Figure 2 is a perspective view of a dual-channel internal injection module for a non-hollow shaft cutting tool according to the present invention, Figure 3 is a longitudinal cross-sectional view of the internal injection module shown in Figure 2, and Figures 4 to 6 are ratio according to the present invention. These are the components of a dual-channel internal injection module for a hollow shaft cutting tool, and Figure 7 shows one of the end mills installed on the dual-channel internal injection module for a non-hollow shaft cutting tool according to the present invention and having a cutting mist flow space inside. This is an example.

The present invention relates to a dual-channel internal injection module that is detachably mounted on a non-hollow spindle and provides an internal injection structure.

Looking at Figures 2 and 3, the internal injection module of the present invention is mounted on a non-hollow spindle without an internal hollow. The part marked S in the drawing refers to the spindle without an internal hollow cutting oil supply passage, and the tool holder is mounted below it to rotate. Among the internal components of the spindle (S), the part where the tool holder is mounted is a part that rotates by a motor (not shown), and the outside of the rotating part is a body part surrounding it, which is called a spindle housing for convenience. The spindle and spindle housing are the same as the conventional cutting device configuration and are general, so detailed description will be omitted.

The dual-channel internal injection module (100, 200, 300) of the present invention is mounted on the outer housing of the spindle (S) to provide an internal injection structure. The dual-channel internal injection module (100, 200, 300) of the present invention broadly consists of a tool holder (100), a cylinder (200), and a fluid supply channel portion (300).

The upper end of the tool holder 100 is coupled to a non-hollow spindle, and a cutting tool (E) is mounted at the lower end, which rotates due to the rotation of the spindle to rotate the cutting tool. Additionally, the cylinder 200 is coupled to the outer peripheral surface of the tool holder via a bearing to support the rotating tool holder. In addition, the fluid supply channel unit 300 supplies fluid to the internal passage and simultaneously couples the dual-channel internal injection module of the present invention to the spindle housing. The lower portion of the fluid supply channel portion 300 is coupled to the outer peripheral surface of the cylinder to support the cylinder, and the upper portion is coupled to the outer housing of the spindle. And, inside, a cutting oil supply channel 320 through which cutting oil is supplied and an air supply channel 340 through which air is supplied are formed. The part indicated by E in the drawing is a cutting tool having an internal hollow portion, and any type of tool having an internal hollow portion can be applied, and several shapes are shown as examples in the drawing.

In the fluid supply channel unit 300, the cutting oil supply channel 320 through which cutting oil is supplied and the air supply channel 340 through which air is supplied are provided separately, so that the cutting oil and air are supplied independently of each other, which will be described below. It is characterized by mixing inside the tool holder and on top of the cutting tool to form a mist. A first hole 320a through which cutting oil is supplied and a second hole 340a through which air is supplied are formed penetrating the inside and outside of the cylinder 200, and each of the cutting oil supply channel 320 and the air supply channel 340 is formed. connected to

In Figure 6, the configuration of various sealing members, snap rings, bearings, etc. provided while surrounding the outer peripheral surface of the tool holder 100 is conceptually shown.

A separation space (a) exists between the outer peripheral surface of the tool holder and the cylinder, and cutting oil and air are supplied into this space. However, the cutting oil and air do not mix in this space, because the spaces are divided from each other within the space by a sealing member. That is, the separation space (a) consists of a cutting oil space (a1) to which cutting oil is supplied by the cutting oil supply channel, and an air space (a2) to which air is supplied by the air supply channel, and the separation space ( In a), the cutting oil space (a1) and the air space (a2) are separated from each other by an internal sealing member, so that the cutting oil and air are not mixed with each other within the space. In addition, it is natural that an outer sealing member (not shown) is provided to seal the entire inside and outside of the spaced space.

The cutting oil space a1 and the air space a2 each have a ring shape surrounding the outer peripheral surface of the tool holder and are spaced apart from each other in the vertical direction.

In addition, the tool holder 100 has a mixing space 110 formed vertically directly above the cutting tool, where mixing occurs. That is, the mixing space 110 and the cutting oil space (a1) communicate with each other, and the first passage 120 that supplies cutting oil to the mixing space, and the mixing space 110 and the air space (a2) are connected to each other. There is a second passage 140 that communicates and supplies air to the mixing space, so cutting oil and air are supplied, and are mixed in the mixing space to form mist.

The first passage is a plurality of passages formed radially in the ring-shaped cutting oil space (a1) toward the mixing space and spaced apart in the circumferential direction, and the second passage is formed in the ring-shaped air space (a2). It is a plurality of passages formed radially toward the mixing space and spaced apart from each other in the circumferential direction.

A cutting tool (E) is located directly below the mixing space, and a flow passage (E1) is provided inside the cutting tool to allow mist to flow and be sprayed onto the cutting area. Therefore, the mist formed by mixing right above the cutting tool flows into the flow passage from the top of the cutting tool and is supplied to the bottom of the cutting tool along the internal flow passage inside the cutting tool. Additionally, a coupling member into which the cutting tool is inserted and fixed is disposed at the lower part of the tool holder.

According to the present invention, since a small amount of cutting oil is supplied by the MQL method, the problems of cutting oil consumption and processing in the case of the flooding method, which is the existing cooling cutting oil supply method, can be solved, and the internal injection type thru-spindle To apply MQL, there is no need to exchange expensive spindle bundles costing tens of millions of won. You can apply MQL by simply attaching it through the connection to the outer surface of the spindle of the equipment to which you want to apply MQL and attaching equipment with a rotary union to the tool clamp. This possible effect occurs. Through this, it is advantageous because MQL can be easily applied without expensive installation costs and loss of machine precision that may occur during the process of removing and installing an existing spindle. The present invention can be applied to all machines, such as machining centers and CNC machine tools.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

Claims (10)

A dual-channel internal injection module that is detachably mounted on a non-hollow spindle and provides an internal injection structure,
A tool holder (100) coupled to a non-hollow spindle at the top and equipped with a cutting tool (E) at the bottom and rotating by rotation of the spindle; A cylinder 200 coupled to the outer peripheral surface of the tool holder via a bearing and supporting the rotating tool holder; and a fluid supply channel, the lower part of which is coupled to the outer peripheral surface of the cylinder to support the cylinder, the upper part of which is coupled to the external housing of the spindle, and which has a cutting oil supply channel through which cutting oil is supplied and an air supply channel through which air is supplied. Part 300;
In the fluid supply channel unit 300, the cutting oil supply channel through which cutting oil is supplied and the air supply channel through which air is supplied are provided separately, so that the cutting oil and air are supplied independently of each other,
A separation space (a) exists between the outer peripheral surface of the tool holder and the cylinder, and the separation space is provided with an outer sealing member that seals the inside and outside,
The separation space (a) includes a cutting oil space (a1) to which cutting oil is supplied by the cutting oil supply channel, and an air space (a2) to which air is supplied by the air supply channel,
In the separation space (a), the cutting oil space (a1) and the air space (a2) are separated from each other by an internal sealing member, so that the cutting oil and air do not mix with each other in the separation space,
The coolant space (a1) and the air space (a2) each have a ring shape surrounding the outer peripheral surface of the tool holder and are arranged to be spaced apart from each other in the vertical direction,
The tool holder 100 includes a mixing space 110 formed vertically directly above the cutting tool; A first passage 120 that communicates the mixing space 110 and the cutting oil space a1 and supplies cutting oil to the mixing space; And a second passage 140 that connects the mixing space 110 and the air space (a2) to supply air to the mixing space. Including, in the mixing space, cutting oil and air are mixed and turned into mist. ,
The first passage is a plurality of passages formed radially in the ring-shaped cutting oil space a1 toward the mixing space and spaced apart from each other in the circumferential direction,
The second passage is a dual-channel internal injection module for a non-hollow shaft cutting tool, characterized in that the second passage is formed in a radial direction toward the mixing space in the ring-shaped air space (a2) and is a plurality of passages spaced apart from each other in the circumferential direction. . According to paragraph 1,
A dual-channel internal injection module for a non-hollow shaft cutting tool, characterized in that a coupling member into which the cutting tool is inserted and fixed is disposed at the lower part of the upper tool holder.

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