JPS6219363A - Polishing inner surface of small hole - Google Patents

Abstract

PURPOSE:To make polishing small hole possible by employing a steel wire of diameter 50-90% of that of the small hole, with super polishing sand glued on the periphery of the steel wire which is, while being rotated and made to contact the inner surface of the small hole, given longitudinal vibrations, and at the same time by rotating a work about the center of the small hole. CONSTITUTION:A grinding steel wire 3 held with and stretched between holders 4 and 5 is of a diameter from 50-90% of that of a small hole 31 of a work 30, with super grinding sand 6 such as diamond grinding sand glued on its periphery as by means of electrodeposition. The holders 4 and 5 rotatably supported with ball bearings 7 and 8 are rotated at a same speed by means of a drive mechanism. Also the holders 4 and 5 are finely vibrated in the axial direction to give longitudinal, reciprocal movement to the steel wire 3. Sleeves 9 and 10 prevent the lateral deflection of the steel wire 3. And the work 30 is rotated by rollers 1 and 2. This makes it possible to polish uniformly inner surface of even a small, long hole of inner diameters of 2mm or less.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for polishing the inner peripheral surface of a pore, which can uniformly polish the inner peripheral surface of a pore having a small inner diameter and a long length. be.

(Prior art) Conventionally, it has been difficult to create pores with an inner diameter of 2 fl or less and a length of more than 100 mm in metal or ceramic workpieces using mechanical processing methods. A laser processing method using a laser beam is used. However, the inner circumferential surface of the pores drilled through laser machining has significant unevenness, so it is desirable to polish the surface. Since bending is extremely difficult, there has been no known technique for uniformly polishing the inner and peripheral surfaces of such pores.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and provides a surface finish by uniformly polishing the inner circumferential surface of a pore with an inner diameter of 2 or less and a long overall length. This was completed with the aim of providing a method for polishing the inner peripheral surface of pores.

(Means for Solving the Problems) The present invention involves bonding superabrasive grains to the outer peripheral surface of a steel wire having a thickness of 50 to 90% of the diameter of the pores inside the pores formed in the workpiece. The method is characterized in that the abrasive steel wire is stretched out, and the abrasive steel wire is vibrated in the longitudinal direction while being rotated while in contact with the inner peripheral surface of the pore, and the workpiece is rotated around the pore. There is a patent for this.

Next, the present invention will be explained in more detail with reference to illustrated embodiments. (1) and (2) are rollers that are rotated in the same direction by a drive mechanism (not shown), and (30) is a roller that rotates in the same direction by a drive mechanism (not shown). ), (2) supported by rollers (1), (2)
The cylindrical workpiece (31), which is rotated in the opposite direction to the workpiece (30), is a pore with an inner diameter of 2-am or less formed through the center of the workpiece (30). (3) is an abrasive steel wire that is stretched inside this pore (31) with both ends held by holders (4) and (5), and the abrasive steel wire (3) is stretched into the workpiece ( 30) Diamond abrasive grains, cubic boron nitride abrasive grains are applied to the outer peripheral surface of a high-tensile steel wire such as a piano wire with a thickness of 50 to 90% of the pore diameter of the pore (31). These superabrasive grains (6) are adhered by a method such as electrodeposition. As shown in the figure, the holders (4), (5) are attached to the pole bearings (7), (
8), and by rotating the holders (4) and (5) at a constant speed by a drive mechanism (not shown), the abrasive steel wire (3) is rotated around its axis. By finely vibrating the holders (4) and (5) in the vertical direction of the drawing, the abrasive steel wire (3) can be reciprocated in its longitudinal direction. Note that (9) and (10) are guide sleeves to prevent the abrasive steel wire (3) from shaking laterally due to centrifugal force when rotated, and the rollers (11, (2)
The workpiece (
It is preferable to attach it so that it is concentric with the pore (31) of 30).

In order to polish the inner circumferential surface of the pore (31) using such a device, the superabrasive grains (6) of the polishing steel wire (3) are adjusted by operating the holders (4) and (5). The glued part is the workpiece (3
The workpiece (30) is brought into contact with the inner peripheral surface of the pore (31) of
), while rotating the abrasive steel wire (3) in the opposite direction to the workpiece (30) and vibrating it in the longitudinal direction, the inner peripheral surface of the pore (31) and the abrasive steel line (3)
The inner circumferential surface of the pore (31) is ground by the relative movement in the longitudinal and rotational directions that occurs between the two, resulting in a uniform and smooth surface. In the present invention, since the abrasive steel wire (3) is used instead of the internal grinding wheel with a shaft, this abrasive steel wire (3)
By applying tension to the pore (31) of the workpiece (30), a pore (with an inner diameter of 21 mm or less and a long overall length) is formed.
It is possible to uniformly polish the inner peripheral surface of 31). In addition, in the present invention, the thickness of the polishing steel wire (3) is set to 5 of the pore diameter.
Since it is 0 to 90%, it is easy to insert the polishing steel wire (3) into the pore (31), and moreover, efficient polishing can be performed. In other words, if the thickness of the abrasive steel wire (3) exceeds 90% of the inner diameter of the pore (31), it becomes extremely difficult to insert the abrasive steel wire (3), whereas if it is less than 50%, the abrasive steel wire (3)
This results in a decrease in surface speed and a decrease in polishing efficiency.

In the above embodiments, the workpiece is assumed to be cylindrical and the roller (
1) and (2), but if an appropriate chuck is used, it is also possible to polish the inner peripheral surface of the pore of a workpiece with a non-circular outer shape, and it is also possible to hold the workpiece vertically. The polishing steel wire (3) can also be stretched vertically by applying tension using a weight.

(Effects of the Invention) As is clear from the above description, the present invention has an inner diameter of 21 mm.
It is possible to uniformly polish the inner circumferential surface of pores that are 1 m or less and could not be polished using conventional internal grinding wheels with a shaft, which eliminates the problems of conventional grinding wheels. This method will greatly contribute to the industry as a polishing method for the inner peripheral surface of pores that eliminates this problem.

[Brief explanation of the drawing]

The drawing is a partially cutaway plan view showing an apparatus used to carry out the invention. (3): Steel wire for polishing, (6): Super abrasive grain, (30): Workpiece, (31): Pore. Patent Applicant: Efes-K Co., Ltd. Representative: Akira Shima, Tatsu Watanabe, Reika Yama
Husband 3 JIIl 14 steel wire 6.8' chicken length 30 卍 2 things 31: # Child

Claims (1)

[Claims] Inside the pores formed in the workpiece, pores with a diameter of 50 to 9
An abrasive steel wire with superabrasive grains adhered to the outer circumferential surface of a steel wire with a thickness of 0% is stretched, and the abrasive steel wire is rotated while being in contact with the inner circumferential surface of the pore in the longitudinal direction. A method for polishing the inner peripheral surface of a pore, which is characterized by vibrating the workpiece and rotating the workpiece around the pore.