KR200196832Y1 - Material supporting construction for centerless grinder - Google Patents

Abstract

The present invention is a device for grinding a workpiece using a plurality of grindstones 22 and a plurality of adjustment grindstones 24: Supports the grindstone 22 to be changeable positionally via a grindstone 21, 1 grinding means for driving the grindstone 22 at a constant speed by the motor 31; A conveying means for supporting the adjusting grindstone 24 in a variable position via an adjusting grindstone 23 and driving the adjusting grindstone 24 at a constant speed by the second motor 32; And support means for supporting the workpiece between the grindstone 22 and the adjustment grindstone 24 via a support roller 26, and using the support 25 to adjust the height of the support roller 26. It is characterized by.

Accordingly, the relative speed with the workpiece rotated during the grinding operation is adjusted to minimize the friction, thereby preventing machining defects on the workpiece surface.

Description

Material supporting construction for centerless grinders

The present invention relates to a workpiece support structure of a centerless grinding machine, and more particularly, a workpiece of a centerless grinding machine which prevents processing defects on the surface of a workpiece by minimizing friction by adjusting a relative speed with a rotating workpiece during grinding. It relates to a support structure.

The centerless grinding machine is a machine tool that processes the surface of a workpiece having a circular section such as pipe, roller, and pin without any fixed shaft. It has advantages.

In addition, since the work of installing and dismantling the work is not necessary, it is easy to automate the process, and it is easy to process the workpiece having a shape that is difficult to be fixed by the chuck or the elongated workpiece. Workpieces are machined in a continuous motion, which reduces machining time and reduces manufacturing costs compared to other grinding methods.

1 is a block diagram schematically showing the main parts of a conventional centerless grinding machine.

In the centerless grinding machine, a grindstone 12 for grinding a workpiece is installed in the grindstone 11, and an adjusting grindstone 14 for feeding a workpiece is installed in the adjusting grindstone 13, and supported in the middle thereof. The blade 16 is fixed to the support 15. According to the diameter of the workpiece, there is a method of moving the grindstone 11 or the adjustment grindstone 13 or both. The grindstone 12 and the adjusting grindstone 14 are installed such that the outer circumferential surface thereof is parallel to each rotation axis, or the rotation shaft of the adjustment grindstone 14 has an inclination angle with respect to the conveying direction of the workpiece. To be transported.

Grinding in the state where the center of the workpiece coincides with the center of the grindstone 12 and the adjusting grindstone 14 tends to deform the trimmed surface. It is generally higher than the center of 14). The upper end of the support blade 16 is shaped into a curved surface that matches the surface curvature of the workpiece, but may be inclined to improve the roundness of the workpiece.

At this time, the deflection of the workpiece is prevented by using a material of low hardness such as Teflon tape plate, wood plate, or other rubber plate as the material of the support blade 16 (aka backup plate), but friction with the workpiece occurs during the grinding operation. Therefore, there is a problem of generating minute scratches on the workpiece surface.

Accordingly, the present invention is to solve the above problems, to provide a workpiece support structure of the centerless grinding machine to prevent the machining defects on the surface of the workpiece by minimizing the friction by adjusting the relative speed with the rotating workpiece during the grinding operation It is for that purpose.

1 is a configuration diagram schematically showing a main part of a conventional centerless grinding machine,

Figure 2 is a block diagram showing the main part of the centerless grinding machine according to the present invention,

3 is a configuration diagram showing a centerless grinding machine according to the present invention in a plane,

Figure 4 is a block diagram showing a partially enlarged support structure according to the present invention.

Explanation of symbols on the main parts of the drawings

11, 21: whetstone 12, 22: whetstone

13, 23: adjustment wheel 14, 24: adjustment wheel

15, 25: support 16: support blade

26: support rollers 31, 32, 33: motor

41: shaft 44: power tool

45: bearing

In order to achieve the above object, the present invention provides a device for grinding a workpiece using a plurality of grindstones and a plurality of adjusting grindstones: a grinding wheel is supported by a first motor so as to be changeable positionally via a grindstone. Grinding means for driving at constant speed; Transfer means for supporting the adjustment wheel in a positional changeable manner via an adjustment wheel and driving the adjustment wheel at a constant speed by a second motor; And a support means for supporting the workpiece between the grindstone and the adjusting grindstone via a support roller, and adjusting the height of the support roller using a support.

At this time, the support roller in the support means is fixed on the shaft rotatably installed in the bracket via a bearing, the shaft is connected via a power mechanism to a third motor capable of constant speed rotation.

The support roller is molded into a round shape using a soft, wear-resistant synthetic resin or rubber, and fixed to a length corresponding to the width of the grindstone.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

Figure 2 is a block diagram showing the main part of the centerless grinding machine according to the present invention, Figure 3 is a block diagram showing a centerless grinding machine according to the present invention in a plan view.

The present invention relates to an apparatus for grinding a workpiece using a plurality of grindstones 22 and a plurality of adjustment grindstones 24, and includes grinding means, transfer means, and support means. In FIG. 3, one grindstone 22, an adjustment grindstone 24, and a support roller 26 are shown, but in reality, the plurality of grindstones 22 are connected in parallel.

The grinding means according to the present invention supports the whetstone 22 so that the position is changeable via the whetstone 21 and performs the function of driving the whetstone 22 at a constant speed by the first motor 31. The grindstone 22 is installed to be movable so that the distance to a workpiece may fluctuate along the groove | channel formed in the arch shape in the grindstone 21.

Reference numeral 28 is a pulley for transmitting rotational torque by shifting the rotation of the first motor 31 at an appropriate speed ratio, and reference numeral 29 is a cylinder for providing a moving force of the grindstone 22 and maintaining a changed position.

In addition, the conveying means according to the present invention supports the adjustment grindstone 24 so that the position changeable via the adjustment grind wheel 23, and drives the adjustment grindstone 24 at a constant speed by the second motor (32). Perform the function. The adjusting wheel 23 is configured such that the adjusting wheel 24 moves and is fixed on the main body. The adjusting wheel 23 and the second motor 32 are integrally fixed on the adjusting wheel 23 and connected by a belt transmission mechanism.

The workpiece is rotated by the grinding resistance and the adjustment grindstone 24 exerts a frictional force in the direction of suppressing such rotation. The circumferential speed of the workpiece adjustment wheel 24 has a slightly faster circumferential speed beam, and the sliding rate is about 2%. The second motor 32 uses a geared motor capable of constant speed control.

In addition, the support means according to the present invention supports the workpiece between the grindstone 22 and the adjustment grindstone 24 via the support roller 26, and adjust the height of the support roller 26 by using the support 25. This is the structure that makes it possible. The support roller 26 is installed so as to be exactly parallel to the conveying direction of the workpiece, that is, the center of rotation of the grindstone 22. The support 25 uses a screw jack or the like.

At this time, the support roller 26 is formed in a round shape using a soft wear-resistant synthetic resin or rubber, it is fixed to a length corresponding to the width of the grindstone (22). The support roller 26 is made of, but not limited to, teflon or urethane rubber. Depending on the hardness of the workpiece, it is also possible to use cast iron, high speed steel, cemented carbide or the like on the upper surface of the grindstone 22. In the shaping | molding of the support roller 26 to the same width as the grindstone 22, the structure which divides into several pieces is also possible. When dividing the support roller 26 is disposed so as to be in a symmetrical position with respect to the whetstone 22.

4 is a schematic view showing a partially enlarged support structure according to the present invention.

In the support means according to the present invention, the support roller 26 is fixed on the shaft 41 rotatably installed in the bracket 42 via the bearing 45, the shaft 41 is made of a constant speed rotatable agent 3 is connected to the motor 33 via the electric mechanism 44. The bracket 43 supporting the third motor 33 is integrally connected with the bracket 42 supporting the shaft 41 and fixed to the main body of the grinding machine through the support 25 as a whole.

Therefore, the integral parts constituting the support means, including the support roller 26 and the third motor 33, are simultaneously vertically moved by the support 25 connected to the bracket 42. Bracket 42 may use a type I beam having a large cross-sectional coefficient to support the bending stress due to the grinding force.

The third motor 33 uses a geared motor and connects the shaft 41 with the chain transmission 44. The shaft 41 is rotatably fixed on the bracket via the bearing 45. Preferably, the shaft 45 is provided at a plurality of points to prevent the shaft 41 from sagging. The mounting position of the bearing 45 selects a portion in which the shear stress or bending moment is large in the shaft 41.

Referring to FIG. 2, in the grinding machine using the plurality of grindstones 22 and the adjusting grindstone 24, the support rollers 26 are installed in plural in positions corresponding to the respective grindstones 22 and the adjusting grindstone 24. do. The support 25 may be provided in two places, one at each end of the bracket 42 regardless of the number of the grindstone 22 and the adjusting grindstone 24. The first motor 31 and the second motor 32 drive the plurality of grindstones 22 and the adjusting grindstone 24 independently, while the third motor 33 drives the plurality of support rollers 26 simultaneously. do.

In the grinding machine of this configuration, if the diameter of the grinding wheel 24 is D, the rotation speed is n, and the inclination angle with respect to the feed direction is α, the feed rate v of the workpiece is

It is calculated simply by the relation

Here, the α value is usually 3 ° or less. If the feedrate is fast, the straightness of the workpiece is improved. If the feedrate is slow, the roundness of the workpiece tends to be improved. When the balance of the force between the grindstone 22, the adjusting grindstone 24 and the support roller 26 is achieved, the workpiece is processed in a circular motion with a stable rotational movement.

In the grinding machine according to the present invention, the grinding wheel 22 was driven at 1800 rpm, the adjusting grinding wheel 24 and the supporting roller 26 at 87 rpm, respectively, and it was confirmed that the surface defects of the finished workpiece were not or significantly reduced.

At this time, the adjustment wheel 24 is inevitable to generate a sliding rate of about 2% with the workpiece, but the support roller 26 is preferably to maintain the same circumferential speed so that the workpiece and the sliding does not occur for the prevention of surface defects. .

Due to the nature of the centerless grinding machine, the center of rotation of the workpiece is not fixed. Therefore, the balance of force is temporarily changed due to the relative position between the grindstone 22, the adjusting grindstone 24, and the support roller 26, and the diameter reduction during the workpiece machining. While the conventional support blade 16 is difficult to handle such a change, the present invention can maintain an optimum balance through the support roller 26 capable of speed control.

According to the above configuration and operation, the present invention has the effect of preventing the machining defects on the surface of the workpiece by minimizing the friction by adjusting the relative speed with the workpiece rotated during the grinding operation.

It is apparent to those skilled in the art that the present invention is not limited to the embodiments described, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or modifications will have to belong to the utility model registration claims of the present invention.

Claims (3)

In an apparatus for grinding a workpiece using a plurality of grindstones 22 and a plurality of adjusting grindstones 24: Grinding means for supporting the whetstone 22 in a variable position via a whetstone 21 and driving the whetstone 22 at a constant speed by a first motor 31; A conveying means for supporting the adjusting grindstone 24 in a variable position via an adjusting grindstone 23 and driving the adjusting grindstone 24 at a constant speed by the second motor 32; And It comprises a support means for supporting the workpiece between the grinding wheel 22 and the adjustment wheel 24 via the support roller 26, and the height adjustment of the support roller 26 using the support 25. A workpiece support structure of a centerless grinding machine. 2. The support roller (26) according to claim 1, wherein the support roller (26) is fixed on the shaft (41) rotatably installed on the bracket (42) via a bearing (45), and the shaft (41) is fixed at constant speed. Work support structure of a centerless grinding machine, characterized in that connected to the rotatable third motor (33) via an electric mechanism (44). The work roller of claim 1, wherein the support roller (26) is formed in a round shape using a soft, wear-resistant synthetic resin or rubber, and fixed to a length corresponding to the width of the grindstone (22). Support structure.