JPS5933511B2 - Internal grinding machine for cylindrical workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an internal grinding machine for a cylindrical workpiece in which a wire tool is mounted on a frame.

[Prior art]

Conventionally, various devices have been used to grind a workpiece by installing a wire tool on which abrasive grains are fixed by electrodeposition or other means on a U-shaped frame, rotating the wire tool, and moving the frame up and down. Exists.

However, in all of these devices, the wire tool was moved up and down by raising and lowering the frame on which the wire tool was installed, so the unbalanced load applied to the frame impairs the centripetality of the frame axis, resulting in unstable stability. There was a drawback that precision grinding could not be achieved due to the lack of. In addition, in the conventional device, the workpiece is completely fixed during grinding, making it impossible to make delicate positional adjustments to the workpiece. [Object of the Invention] Therefore, in order to eliminate these drawbacks of the conventional device, the present invention fixes the frame so that only the wire tool can move up and down, and the workpiece itself is also configured to be rotatable and position adjustable. It is an object of the present invention to provide an internal grinding machine for cylindrical workpieces, which makes it possible to perform precision internal grinding of small-diameter workpieces, which has traditionally been considered mechanically difficult.

[Structure of the invention]

The present invention provides an upper and lower arm section that extends horizontally on a base.
A hollow column is set up at a certain point, and a rotary shaft that is rotated by a motor is installed inside the column. Near the tips of the upper and lower arms, there is a cylinder with multiple protrusions on the inner wall. A shaped exterior tube is rotatably supported, a spline tube with a spline groove corresponding to the protrusion is inserted into each exterior tube, and a chuck is provided at the inner end of each spline tube. At the outer end, an inner tube is fitted with a spring body wrapped around it and a nut for restraining the spring body is screwed so that it can be slid in the vertical direction and the rotational force of the spline tube can be transmitted. An endless belt is wound around each exterior cylinder and the rotating shaft, and a lifting rod is provided near the base of the arm portion through which the lifting rod is regularly raised and lowered by a hydraulic mechanism, and above and below the lifting rod, An actuating rod that rotatably holds the spline tube is attached to the tip, and a wire tool partially coated with abrasive particles such as diamond particles is stretched between the chucks, while a horizontal surface is attached to the base. An adjustment table that can be adjusted to move in the right angle direction is fixed, a straddle post is erected on top of it, and a table with through holes for inserting the wire tool is regularly drilled on the straddle post using a hydraulic mechanism. It is installed so that it can be raised and lowered, and on this table,
This is an internal grinding machine for a cylindrical workpiece, which is equipped with a holding chuck for fixing the workpiece and a motor for rotationally driving the chuck, and the drawings show an embodiment thereof.

There, 1 is a hollow column erected on the base 2,
Arm portions 1a and 1b extending horizontally above and below are provided.
3 is a rotating shaft installed in the column 1, and 4 is a motor for rotating the rotating shaft 3.

5 is an exterior cylinder with an appropriate number of protrusions 5a on its inner wall;
a, 1b via bearings so as to be rotatable.

Reference numeral 6 denotes a spline tube fitted into the exterior cylinder 5, and a spline groove corresponding to the protrusion 5a is vertically provided on the outer periphery of the tube.

By doing so, the spline tube 6 can freely slide up and down with respect to the outer tube 5, and the rotation of the outer tube 5 is directly transmitted to the spline tube 6. Reference numeral 7 denotes an inner tube, which is fitted into the spline tube 6 in the same connection relationship as the outer tube 5 and the spline tube 6 described above.

Alternatively, a vertical groove may simply be provided on the inner wall of the spline tube 6, and a protrusion may be provided on the inner tube that fits into the vertical groove and slides up and down within the vertical groove. A chuck 8 such as a drill chuck or a collect chuck is attached to one end of the inner pipe 7, and the other end is threaded, a spring body 9 is wrapped therein, and the nut 10 is used to restrain the chuck 8. The above-described exterior tube 5, spline tube 6, and inner tube 7 constitute a rotating body. Reference numerals 11 and 11a are endless belts that are looped around the rotating shaft 3 and the outer cylinder 5, and usually a timing belt is used.

Reference numeral 12 denotes a lifting rod that is installed near the bases of the arms 1a and 1b so that it can be raised and lowered, and is raised and lowered regularly using a lifting device 12a such as a hydraulic lifting device incorporating a solenoid valve.

Reference numerals 13 and 13a are actuating rods attached to the upper and lower sides of the lifting rod 12, and a strong bearing in the vertical direction is provided at the tip thereof, and the spline tube 6 is supported by the operating rods.

Reference numeral 14 denotes a wire tool made of high speed steel or other suitable material to which abrasive grains 14a such as diamond grains are attached, and its both ends are tensioned and fixed to the chucks 8, 8a.

Reference numeral 15 denotes an adjustment table formed by combining two stages of reciprocating mechanisms used in lathes, etc. in the right angle direction, and is installed on the base 2, and the workpiece is usually slightly moved back and forth and left and right by manual operation of the handle. .

Reference numeral 16 denotes a straddle post erected on the adjustment table 15; 17 a table attached to the straddle post 16 so as to be able to move up and down; a through hole 17a for inserting the wire tool 14 is bored;
A lifting rod 1 that passes through 6a and connects to the hydraulic lifting device 18.
7b is provided.

A holding chuck 19 is rotatably placed on the table 17 and holds the workpiece 20 fixedly.

21 is a motor that rotates the holding chuck 19.

[Action of the invention]

To explain the operation of the present invention with reference to the drawings, a workpiece 20
is fixed with a holding chuck 19, and the abrasive grains 14a are attached to the workpiece 20.
The wire tool 14 is inserted into the inner hole of the wire tool 14, and both ends of the wire tool 14 are tensioned and fixed in the chucks 8 and 8a.

At that time, if the nut 10 is screwed further, the spring body 9 acts to move the nut 10 away from the spline pipe 6,
As a result, the spline tube 7 in the arm portion 1a is pulled up, and conversely, the spline tube 7 in the arm portion 1b is pulled down, thereby increasing the tension of the wire tool 14. If the motor 4 is started in such a state, the rotating shaft 3!
．． The rotating body, the chucks 8, 8a, and the wire tool 14, which are connected to it via the endless belts 11, 11a, rotate, and internal grinding begins. Additionally, when the motor 21 is started, the holding chuck 19 rotates (usually the wire tool 14
and holding chuck 19 in opposite directions. ), grinding is performed efficiently. Next, the lifting device 12a is started and the lifting rod 12 is raised and lowered regularly, and the rotating body is moved up and down via the actuating rods 13 and 13a (excluding the outer cylinder 5 of the rotating body that actually moves up and down). ) and further adjust the position of the workpiece 20 by operating the adjustment table 15 as necessary, so that the abrasive grains 14a come into uniform contact with the inner surface of the workpiece 20, and uniform grinding can be achieved. can. Note that it goes without saying that the vertical movement of the rotating body and the vertical movement of the table 17 may be used together, or only one of them may be used. Also, during grinding, appropriate grinding fluid is poured using a conventional method. [Effects of the Invention] As described above, in the present invention, the column on which the wire tool is installed is fixed, and only the wire tool is moved up and down to perform grinding.

Therefore, there is no need to consider instability of the frame due to uneven loads, and precision grinding of the inner surface of a cylindrical workpiece can be performed accurately.
In addition, the workpiece itself can be moved up and down and also rotated, allowing efficient precision grinding. Furthermore, by operating the adjustment table, it became possible to finely adjust the position of the workpiece. As described above, the present invention is extremely useful because it enables internal grinding of small-diameter workpieces, which has heretofore been considered mechanically difficult, and also enables uniform and accurate grinding.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing an internal grinder for a cylindrical workpiece according to the present invention, Fig. 2 is a longitudinal sectional view showing the configuration of the rotating body, Fig. 3 is a cross-sectional view of the same, and Fig. 4 is a It is a figure which shows the connection relationship of a straddle pillar and a table.

Claims (1)

[Claims] 1 A hollow column with arms extending horizontally in two places, upper and lower, is erected on a base, and a rotating shaft that is rotated by a motor is installed inside the column, and the upper and lower arms are connected to each other. Near the tip, a cylindrical outer tube with multiple protrusions on the inner wall is rotatably supported, and a spline tube with spline grooves corresponding to the protrusions is inserted into each outer tube. Furthermore, in each spline tube, an inner tube is provided with a chuck at the inner end, a spring body is wrapped around the outer end, and a nut is screwed to prevent the spring body from being slidable in the vertical direction. The spline tube is fitted in such a manner that the rotational force can be transmitted, and an endless belt is wrapped around each outer tube and the rotating shaft, and a hydraulic mechanism is used to regularly belt the spline tube around the base of the arm. A lifting rod that moves up and down is provided, and operating rods that rotatably hold the spline tube are attached to the top and bottom of the lifting rod, and abrasive grains such as diamond particles are partially attached between the chucks. On the other hand, an adjustment table that can be moved and adjusted in a right angle direction on a horizontal plane is placed on the base, a straddle post is erected on it, and the wire tool is inserted into the straddle post. A cylindrical table is installed that can be raised and lowered regularly using a hydraulic mechanism, and a holding chuck for fixing the workpiece and a motor for rotationally driving the holding chuck are installed. Internal grinding machine for shaped workpieces.