JP2000288931A - Grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding device capable of grinding a small groove below 0.5 millimeter by supplying processing liquid to a portion to be machined without causing grinding wheel breaking, and securing the rigidity of a grinding wheel shaft. SOLUTION: A pair of flanges 3 and 4 are fixed to the tip outer periphery of a shaft 2 integrated with a grinding wheel shaft, and a grinding wheel 5 is held between the flanges 3 and 4. A plurality of groove portions are radially provided to supply grinding liquid in both supporting surfaces 31 and 41 of the flanges 3 and 4, the holding force of the grinding wheel is thereby increased, a plurality of axially extended grinding liquid supply grooves 24 are formed in the tip outer periphery of the shaft 2, and inserted into the plurality of groove portions, and thus a reduction in the rigidity of the grinding wheel shaft is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding apparatus used for grinding a narrow groove of a die for extrusion molding, and the like.
More specifically, the present invention relates to a grinding device having a grinding fluid supply mechanism for supplying a grinding fluid to a grindstone.

[0002]

2. Description of the Related Art When a groove is formed in an extrusion molding die or the like by a grinding wheel, a grinding fluid is usually supplied to a processing portion where the grinding wheel is in contact with a workpiece for the purpose of cooling the wheel and eliminating processing waste. While grinding. FIG. 6 shows a general method of supplying a grinding fluid, in which a grinding fluid supply nozzle 92 is opened outside flanges 93 and 94 supporting a grinding stone 91, and the nozzle 92 is directed toward both side surfaces of the grinding stone 91. The grinding fluid is jetted out and sprayed on the processing site.

[0003] The above-mentioned conventional method is effective when the grindstone 91 is thick and has sufficient strength. However, when machining a narrow groove of about 0.5 mm or less, the grindstone 91 is also reduced to about 0.5 mm or less. When the grinding fluid is sprayed at a high pressure, the grindstone 91 is bent to make processing difficult. In order to avoid this, it is necessary to reduce the supply pressure of the grinding fluid. However, since the grinding wheel shaft is rotating at about 6000 rpm during processing, an air flow as shown in FIG. This hinders the problem that the grinding fluid hardly reaches the surface of the grindstone 91.

On the other hand, Japanese Utility Model Laid-Open No. 3-109765 discloses a flange 9 for holding a grindstone 91 as shown in FIG.
The ring-shaped recesses 93b, 9 are formed in the grindstone holding surfaces 93a, 94a so that a liquid reservoir 95 is formed by the grindstones 91 and 3, 94.
4b, a communication hole 96 for supplying the grinding fluid to the liquid reservoir 95 is provided on the inner peripheral side of the concave portions 93b and 94b, and a plurality of holes for discharging the grinding liquid outward from the liquid reservoir 95 are provided on the outer peripheral side. A grindstone flange provided with a groove 97 has been proposed. In this grinding wheel flange, the grinding fluid is directly supplied to the side surface of the grinding wheel 1 from the supply path 98a inside the grinding wheel shaft 98 through the communication hole 96, the liquid reservoir 95, and the groove 97, so that the grinding fluid supply nozzle is provided outside. There is no airflow problem as in conventional methods.

[0005]

However, the above-mentioned grinding wheel flange has a grinding wheel holding surface 9 for forming a liquid reservoir 95.
Ring-shaped concave portions 93b and 94b are formed on both surfaces of 3a and 94a, and the grindstone 91 is unrestricted in these portions (portion 91a indicated by a mark x in the figure). If the grindstone flange in which the unconstrained portion 91a of the grindstone 91 is present in such a wide range is applied to a narrow groove processing of 0.5 mm or less, for example, about several tens of μm, the grindstone 91 cannot be sufficiently supported, There is a possibility that the grindstone 91 may be broken apart by the pressure of the grinding fluid. Further, the broken whetstone 91 closes the groove 97 for discharging the grinding fluid, which causes not only a decrease in the cleaning power, but also a fragment of the whetstone 91 to be carried to the processing portion, which causes a whetstone crack.

In the configuration shown in FIG. 7, a grinding wheel shaft 98 having a tapered tip is used, and a supply passage 98a for supplying a grinding fluid to the liquid reservoir 95 is formed in the tapered portion. Since the holes 98 are directly drilled, there is a possibility that problems such as poor shaft accuracy and reduced rigidity due to drilling holes in the machine body may occur.

Therefore, the present invention does not cause a grinding wheel crack even when a thin grinding wheel for fine groove grinding is used.
The grinding fluid is reliably supplied to the machining area to prevent clogging and burning of the grinding wheel, to enable the grinding of fine grooves of about 0.5 mm or less. An object of the present invention is to realize a grinding device capable of preventing a reduction in force.

[0008]

According to a first aspect of the present invention, there is provided a grinding apparatus having a pair of flanges mounted on an outer periphery of a tip end portion of a shaft member which is driven to rotate, and holding a grinding wheel between the pair of flanges. A passage for supplying the grinding fluid is provided in the pair of flanges. A plurality of grooves serving as the passages are radially provided on both support surfaces of the pair of flanges for supporting the grinding wheel, and a plurality of grinding fluid supplies extending in a plurality of axial directions are provided on the outer periphery of the tip of the shaft member. A groove is formed and communicates with the plurality of grooves on both support surfaces.

According to the above configuration, the grinding wheel is supported between the two supporting surfaces of the pair of flanges provided with a plurality of grooves for supplying the grinding fluid in a radial manner. A passage for supplying the grinding fluid can be provided in the flange without forming an unconstrained portion. Therefore, it is possible to reliably supply a grinding liquid to a processing portion while preventing cracking of a grindstone, efficiently perform fine groove grinding of about 0.5 mm or less, and improve processing quality, processing accuracy, and processing speed. . In addition, since the plurality of grooves are configured to supply the grinding fluid from the plurality of grinding fluid supply grooves provided in the axial direction on the outer periphery of the shaft member, it is not necessary to perform a hole machining or the like inside the grinding wheel shaft, A decrease in shaft accuracy and rigidity can be prevented.

According to the second aspect of the present invention, a circumferential groove is formed on the outer periphery of the front end portion of the shaft member so that the front end portions in the flow direction of the plurality of grinding fluid supply grooves communicate with each other. By appropriately adjusting the width of the groove in the circumferential direction, a good balance of the flow of the grinding fluid supplied from the grinding fluid supply groove to the two support surfaces of the pair of flanges is maintained, and between the two support surfaces. The grinding fluid can be supplied evenly to both sides of the held grinding wheel.

According to a third aspect of the present invention, an annular groove connecting the plurality of groove portions to each other is formed on the two support surfaces of the pair of flanges. Thereby, the pressure of the grinding fluid flowing through the plurality of grooves can be kept constant, so that the grinding fluid can be uniformly jetted from the ends of the plurality of grooves.

According to a fourth aspect of the present invention, a cylindrical member is provided at the tip of the shaft member protruding from the flange to serve as a grinding fluid supply passage having an interior communicating with the grinding fluid supply groove. Thus, the grinding fluid can be easily supplied from the grinding fluid supply passage to the grinding fluid supply groove on the outer periphery of the shaft member.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1A is an overall configuration diagram of a grinding device according to the present invention, and FIG. 1B is an exploded view thereof.
In FIG. 1A, a shaft 2 serving as a shaft member is coaxially provided on a grinding wheel shaft 1 connected to a drive source (not shown) so as to be integrally rotated. A pair of front flanges 3 and rear flanges 4 are mounted on the outer periphery of the tip (left end in the figure) of the shaft 2, and a grinding wheel 5 is sandwiched between the flanges 3 and 4.

A cylindrical spacer member 22 is interposed between a flange 21 provided at the base end (the right end in the figure) of the shaft 2 and the rear flange 4, and projects to the left of the front flange 3. A cylindrical member 6 whose interior is a supply path 63 for the grinding fluid is mounted at the tip (left end in the figure) 23 of the.
As shown in FIG. 1B, the cylindrical member 6 has a threaded portion 61 on its inner periphery.
a, and a cylindrical bearing holder 62 disposed on the left end side and having a threaded portion 62a on the right end. On the other hand, screw portions 23a and 23b corresponding to these are formed on the outer periphery of the distal end 23 of the shaft 2, and the rear flange 4 and the front flange 3 are fitted to the shaft 2 via the spacer member 22 in this order. 3, the fastening member 6
1 and the bearing holder 62 are screwed in order to be fixedly fastened.

FIG. 2 shows two supporting surfaces 31 and 41 of the front flange 3 and the rear flange 4 for holding the grinding wheel 5.
As shown in (a) to (c), a large number of grooves 32 and 42 from the inner peripheral edge to the outer peripheral edge are provided radially at substantially equal intervals to provide a passage for supplying a grinding fluid to the side surface of the grinding wheel 5. Has formed. Outer peripheral ends 32a, 4a of these grooves 32, 42
2a is formed with a slightly smaller groove width so that the grinding fluid is jetted at a high pressure due to the drawing effect. In addition, a plurality of annular grooves 33, 43 are provided on each of the support surfaces 31, 41, and each of the plurality of groove portions 32, 42 communicates with each other. The annular grooves 33 and 43 are used to keep the pressure of the grinding fluid flowing through the grooves 32 and 42 constant.
42 and the same width. Here, each support surface 31, 4
Although the two grooves 32 and 42 are formed in one, it is not necessarily limited to this, and a single groove may be used as long as the pressure of the grinding fluid can be kept constant. Usually, a water-soluble liquid is used as the grinding liquid.

As generally known, the grinding wheel 5
If the support surfaces 31 and 41 of the flanges 3 and 4 are held and fixed, the tips of the flanges 3 and 4 are opened, and the grinding wheel holding force is reduced. For this reason, a relief process for slightly recessing the central portion of the grindstone supporting surfaces 31 and 41 with respect to the outer peripheral portion is usually performed. However, in the narrow groove grinding as in the present invention, the grinding wheel 5 is thin (about 0.5 mm or less). If the relief amount is large because the strength is low, the grinding stone at the relief portion will be broken by the pressure of the grinding fluid passing between the flanges 3 and 4. In this embodiment, as an appropriate escape amount to avoid this,
In each of the support surfaces 31 and 41, the outer peripheral annular grooves 33 and 4
This is prevented by relieving about 0.02 mm of the surface inside 3.

As shown in FIGS. 3 (a) and 3 (b), a number of grinding fluid supply grooves 24 extending in the axial direction are formed on the outer periphery of the tip (left end) of the shaft 2, and the outer periphery thereof is formed. The plurality of grooves 32 and 42 of the flanges 3 and 4 to be mounted communicate with the grooves 32 and 42 so that the grinding liquid is supplied to the grooves 32 and 42. Each grinding fluid supply groove 24 is formed slightly oblique to the axial direction so as to coincide with the flow direction of the grinding fluid receiving the rotational force of the shaft 2. Thereby, the grinding fluid is smoothly sucked into each of the large number of grinding fluid supply grooves 24 with the rotation of the shaft 2, and the supply of the grinding fluid is favorably performed.

A circumferential groove 25 is formed on the outer periphery of the shaft 2 at the end of the grinding fluid supply groove 24 in the flow direction, so that the grinding fluid supply grooves 24 communicate with each other. I have. This groove 25 is formed in the front flange 3
In order to maintain the liquid flow balance between the front flange 3 and the rear flange 4, the flow rate on the front flange 3 side increases at a ratio of about 2: 1 without the groove 25. It is possible to increase the amount of fluid flow on the fourth side, and to maintain a good balance of fluid flow by adjusting the width of the grinding fluid supply groove 24 and the groove 25.

In FIG. 1B, the fastening member 61 of the tubular member 6 has an annular groove 61b on the right end surface and a through hole 61c communicating between the left and right end surfaces. Also,
The bearing holder 62 has a through hole 62c communicating the internal liquid reservoir 62d and the annular groove 62b on the right end face,
The liquid reservoir 62d and the recess 6 into which the bearing 64 is fitted.
2e communicates with the through-hole 62f. Thus, when the fastening member 61 and the bearing holder 62 are screw-fixed to the distal end 23 of the shaft 2, the through hole 62f, the liquid reservoir 62d, the through hole 62c, the annular groove 62b, the through hole 61
c, the grinding fluid supply path 63 shown in FIG. 1A is formed by the annular groove 61b. A hose 71 communicating with the grinding fluid supply pump 7 is connected to a hose joint 65 fitted to the bearing 64.

At this time, as shown in FIG. 5 (a), it is preferable to dispose a filter 8 for filtering the grinding fluid in the middle of a hose 71 connected to the grinding fluid supply pump 7.
As shown in FIG. 5B, the filter 8 for filtering the grinding fluid is provided in a cartridge type container 81.
A known wind cartridge filter having a built-in 2 can be used. When the grinding fluid is used in a circulating manner, after the cutting powder and abrasive grains mixed in the grinding fluid in the tank during the grinding process are filtered through the filter 8, the grinding is performed. Can be supplied to the device.

In the above-structured grinding apparatus, the grinding fluid supplied from the pump 7 is supplied to the grinding fluid supply groove 24 on the outer periphery of the shaft 2 via the grinding fluid supply passage 63. here,
As shown in FIG. 1B, an annular groove 3 a facing the annular groove 61 b of the fastening member 61 is provided on the left end surface of the front flange 3.
The grinding fluid that has passed through the grinding fluid supply passage 63 flows from the annular groove 3a into the grinding fluid supply groove 24, and is further supplied to the groove portions 31 and 41 of the flanges 3 and 4.
As shown in FIGS. 4A to 4C, the grinding fluid is supplied to the grinding wheel shaft 1.
It moves outward due to the centrifugal force caused by the rotation of, and is ejected from the outer peripheral edges of the flanges 3 and 4 along the side surface of the grinding wheel 5.

According to the above construction, a large number of grooves 32, 42 for supplying the grinding fluid are provided on both support surfaces 31, 41 of the flanges 3, 4.
Are provided evenly so that the unconstrained portion of the grindstone does not exist in a wide area. Therefore, even when the grindstone 5 is as thin as about 0.5 mm or less, the grindstone 5 does not crack or bend. Also, the grooves 32, 42 of both support surfaces 31, 41
The grinding fluid supply groove 24 on the outer periphery of the shaft 2 is communicated with the shaft 2 and the circumferential groove 25 is provided.
The grinding fluid can be supplied to the components 1 and 41 in a well-balanced manner. Further, annular grooves 33 and 43 are provided to communicate the grooves 32 and 42 of the flanges 3 and 4, respectively.
Since the pressures 2 and 42 are set to the same pressure, the grinding fluid flows evenly into the groove 31 of the flange 3 and the groove 41 of the flange 4.

As a result, as shown in FIG. 4 (c), the grinding fluid can be jetted uniformly and at a high pressure from the inside of the flanges 3 and 4 along both side surfaces of the grinding wheel 5. If the flow rate of one side of the grinding wheel 5 is smaller than that of the other side, the clogging of the side of the grinding wheel is multiplied, and the cutting resistance balance is lost. There is a possibility that the whetstone cracks. However, the configuration according to the present invention can prevent this and improve the processing accuracy. Further, since the grinding fluid can be reliably supplied to the grinding portion, clogging of the grinding wheel 5 and burning of the grinding wheel can be prevented, and fine groove processing of about 0.5 mm or less can be favorably performed. In addition, since the outer peripheral end portions 32a, 42a of the many groove portions 32, 42 are narrowed and narrowed, a stronger hydraulic pressure can be obtained, the cleaning and cooling effects are improved, and the grinding liquid is applied along the side surface of the grinding wheel 5. Because it is supplied at high pressure,
The grinding wheel strength is improved by the dynamic pressure effect of the grinding fluid. Further, since the grinding fluid supply groove 24 is provided on the outer periphery of the shaft 2 and it is not necessary to perform drilling, it is possible to prevent poor shaft accuracy and a reduction in rigidity.

Next, using the above-structured grinding apparatus, a fine groove was actually formed. Width of the grinding wheel 5 of the grinding device
06 mm, the protrusion amount of the grinding wheel 5 from the flanges 3 and 4 is 3 mm, the grinding wheel rotation speed during processing is 6000 rpm, the grinding wheel peripheral speed is 1885 mm / min, the groove width is 0.06 mm, the groove depth is 0.06 mm. A 2.3 mm thin groove was machined. The material of the mold to be processed was SKD-61.

First, prior to the processing of the fine grooves, the groove widths of the grinding liquid supply grooves 24 and the grooves 25 were adjusted. For adjustment, a water flow test is performed with the grinding wheel 5 sandwiched between the flanges 3 and 4. If the water flow rate on the front flange 3 side is large, the width of the grinding fluid supply groove 24 is increased, and The width of the groove 25 was increased, and the width of the groove was adjusted while balancing the amount of water flow between the front flange 3 and the rear flange 4. In addition,
The method of checking the liquid flow balance is such that, while the grinding wheel 5 is held between the flanges 3 and 4, one side of the flange is shifted about 5 degrees in the circumferential direction so that the grooves of the flanges 3 and 4 are alternately arranged. The height of the water column at that time was visually checked.

After that, when the fine groove processing was performed under the above conditions, the grinding fluid was supplied to the ground portion satisfactorily, and the fine groove processing could be performed without causing problems such as clogging, seizure, and cracking of the grindstone. did it. As described above, according to the grinding apparatus of the present invention, it is possible to flow water to both flanges 3 and 4 in a well-balanced manner without performing drilling on the grinding wheel shaft, to secure the grinding wheel shaft strength, While grinding is prevented, it is possible to grind a narrow groove of about several tens μm, which was impossible in the past.

[Brief description of the drawings]

FIG. 1A is an overall configuration diagram of a grinding device of the present invention,
(B) is an exploded view thereof.

FIG. 2A is a front view of a support surface side of a flange, and FIG.
Is a cross-sectional side view of the flange, taken along line AA of FIG.
(C) is a side sectional view of the flange, and is a sectional view taken along line BB of (a).

3A is a front view of a shaft, and FIG. 3B is a side view of the shaft.

FIG. 4A is a diagram showing a configuration in which a grinding fluid filtering filter is attached to the grinding device of the present invention, and FIG. 4B is a schematic configuration diagram of the grinding fluid filtering filter.

5A and 5B are views for explaining the operation of the grinding device of the present invention, wherein FIG. 5A is a partial cross-sectional view showing a state in which liquid flows through a flange;
(B) is a diagram showing a state in which the grinding fluid is ejected from the flange,
(C) is a figure which shows the state of supply of the grinding fluid to the grinding wheel side surface.

FIG. 6 is a diagram showing a supply state of a grinding fluid in a conventional grinding device.

FIG. 7 is an overall configuration diagram of a conventional grinding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whetstone shaft 2 Shaft (shaft member) 23 Tip 24 Grinding fluid supply groove 25 Circumferential groove 3, 4 A pair of flanges 31, 41 Support surface 32, 42 Plural grooves 5 Grinding grindstone 6 Cylindrical member 61 Fastening member 62 Bearing Holder 63 Grinding fluid supply path 7 Grinding fluid supply pump 8 Filter for grinding fluid filtration

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tomohiko Nakanishi 14 Iwatani, Shimowasumi-cho, Nishio-shi, Aichi Japan Inside Automobile Research Institute, Inc. (72) Inventor Yoshiyasu Ando 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture F term in DENSO Corporation (reference) 3C047 GG01 3C049 AA03 AA14 AC04 CA01 CA02 CB01 CB02

Claims (4)

[Claims] 1. A pair of flanges are mounted on the outer periphery of a tip portion of a shaft member driven to rotate, a grinding wheel is sandwiched between the pair of flanges, and a passage for supplying a grinding fluid is provided in the pair of flanges. In the grinding device, a plurality of grooves serving as the passages are radially provided on both the support surfaces of the pair of flanges that support the grinding wheel, and a plurality of grinding fluids extending in a plurality of axial directions on the outer periphery of the distal end of the shaft member. A grinding device, wherein a supply groove is formed and communicated with the plurality of grooves on both support surfaces. 2. The grinding apparatus according to claim 1, wherein circumferential grooves are formed on the outer periphery of the distal end of the shaft member so as to communicate the distal ends of the plurality of grinding fluid supply grooves in the flow direction. 3. The two support surfaces of the pair of flanges,
3. The grinding device according to claim 1, wherein an annular groove connecting the plurality of grooves is formed. 4. The grinding device according to claim 1, wherein a cylindrical member serving as a grinding fluid supply passage having an inside communicating with the grinding fluid supply groove is mounted at a tip of the shaft member protruding from the flange.