JPS5811493Y2 - Fixed structure of fine movement feed mechanism in dimensional accuracy maintenance device of grinding machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixing structure for a fine movement feeder of a dimensional accuracy maintaining device that can define the dimensional accuracy and surface roughness of a workpiece of a grinding device.

Previously, the applicant of the present invention et al. set a chip harder than the grinding wheel in a grinding machine to face the grinding surface of the grinding wheel and set it at the reference position of the final finishing dimension of the workpiece, When the cut is fed after reaching the final finishing dimension, the cutting surface of the grinding wheel is scraped off with the chip, and the workpiece is accurately ground to the final finishing dimension, and the surface roughness of the crocodile is maintained constant. A device for maintaining dimensional accuracy has been developed and put into practical use.

In this dimensional accuracy maintenance device, the fine movement feed mechanism is operated to advance and move the member 101 to which the chip is attached as shown in FIG. and the member 101 to which the chip is attached by tightening the lock screw at this position.
is locked together with other members 100, and when the member 101 to which the chip is attached is moved in the forward direction, a detent key 102 and a key groove that cooperate with the feed screw to constitute a fine movement feed mechanism are used. 103 are in close contact with the surface of the member to which the chip is attached in the direction A that transmits the rotational torque, and when locked in this state, the chip is set at the regular reference position O, but when the chip is attached As shown in FIG. 1B, the locking member 101 is moved to the return direction opening within the range of backlash between the locking key 102 and the keyway 103, which is the direction opposite to the direction of transmitting the rotational torque. If the tip is locked in the rotated state, an error will occur in the set position of the tip by the amount of backlash.

The present invention is a fine movement feed mechanism in a dimensional accuracy maintenance device for a grinding machine that can completely eliminate errors in the tip setting position caused by the backlash of the member to which the tip is attached returning between the detent key and the keyway. The purpose is to provide a fixed structure for

The configuration of the present invention will be explained in detail below based on the drawings.

2, 3, 4, 5, 6, and 7 show embodiments of a wheel grinding device for grinding the outer circumferential surface of a workpiece W. FIG.

In this embodiment, the grinding machine includes a headstock 1. It is equipped with a shinshin stand 2 and a grinding wheel 3, gives relative rotation to the grinding wheel 3 and the workpiece W, and gives a reciprocating motion The outer peripheral surface is ground.

A dimensional accuracy maintaining device 4 is attached to the Shinshindai 2, and the dimensional accuracy maintaining device 4 includes a tapered shaft 5 that fits into a tapered hole of the Shinjindai 2, and a mounting base 6 connected to one end of the tapered shaft 5.
, a chip holder 7, a chip 16, and a lock screw 17 are mounted on the mount 6 in a direction perpendicular to the axial direction of the mount 6, that is, facing the grinding surface of the grinding wheel 3.

The tip holder 7 includes a sleeve 8, a rod 9 inserted therein, a knob 10 for rotating the rod 9, a fine movement mechanism 11, and a tip 16.

As clearly shown in FIG. 5, the fine movement feed mechanism 11 includes a feed screw provided in the sleeve 8, in which an internal thread 12 formed on the sleeve 8 and an external thread 13 formed on the rod 9 are screwed together. It has a coupling structure in which a detent key 14 is fitted into a key groove 15 formed in the rod 9 that is long in the axial direction Y-Y, and by rotating the knob 10 forward or backward, the feed screw and the detent key are connected. 14 and the keyway 15, the rod 9 is moved slightly forward and backward in the axial direction Y-Y, and the tip 16 can be adjusted to the reference position O for the final finishing dimension of the workpiece W. The direction in which the rod 16 is advanced in the final finishing direction O of the workpiece W is defined as the advancing direction of the rod 9.

In this embodiment, the lock screw 17 constituting the fixing structure of the fine movement feed mechanism 11 includes a first set screw 18 and a second set screw 24 screwed into the inside thereof. has a hexagonal head 19, a male thread 20, a fitting part 21, and a screw hole 23, and the second setscrew 24 has a male screw 25 screwed into the screw hole 23, and a male screw 25 formed in the head. It has a wrench fitting hole 26.

On the other hand, the mounting base 6 of the tip holder 7 has a diametrical axis Z- of the sleeve 8 and the rod 9 superimposed on the same axis.
The lock screw 1 is located at a position Z'-Z' that is eccentric by △2 from Z.
A female thread 27 is formed into which the male thread 20 of the first set screw 18 of No. 7 can be fitted, and the sleeve 8 has a first female thread 27 formed in two stages in the thick part and long in the axial direction Y-Y. Second elongated hole 28.
29 is formed, and the first elongated hole 28 is connected to the lock screw 17.
The second elongated hole 29 is formed to have a wide width d1 into which the fitting portion 21 of the first set screw 18 can be inserted, and the second elongated hole 29 is
It is formed to have a width d2 through which it can be inserted.

The eccentric position z'-z' is the diametrical axis Z of the rod 9.
-Z, the detent key 14 and the keyway 15 are locked in a coupled state in which the surfaces in the direction that transmit the rotational torque when the feed screw is operated in the direction of advancing the rod 9 are in close contact with each other. Set to the Uru side.

Then, the male thread 20 of the first set screw 18 of the lock screw 17 is screwed into the female thread 27 formed on the mounting base 6,
At the stage when the tip 16 is adjusted to the reference position O of the final finishing dimension of the workpiece W by the fine movement feed mechanism 11, the first set screw 18 and the second set screw 24 are sequentially tightened, and the sleeve 8 is tightened with the lock screw. The rod 9 is locked against movement in the axial and circumferential directions by a first set screw 18 of 17, and the rod 9 is locked against movement in the axial and circumferential directions by a second set screw 24.

In this locked state, the lock screw 17 rotates with respect to the diametrical axis Z-Z of the rod 9 when the detent key 14 and the keyway 15 operate the feed screw in the direction of advancing the rod 9. Since it is provided at an eccentric position z'-z' that can lock the surfaces in the torque transmission direction in close contact with each other, the detent key 14 is located in the keyway as shown by the arrow in FIG. End face 15a on the side that pushes 15
It is fixed in the pressed position.

Therefore, in the fixing structure of the fine movement feed mechanism 11 configured as described above, the lock screw 17 ensures that the detent key 14 and the keyway 15 that constitute the fine movement feed mechanism 11 always face the surface in the direction of transmitting rotational torque in the forward direction to the rod 9. Since they are fixed in contact with each other, the tip 16 is reliably fixed at the normal position initially adjusted to the reference position O of the final finishing dimension of the workpiece W.

Therefore, when the grinding wheel 3 is further fed y after reaching the reference position O for the final finishing dimension of the work W, the tip 16 set at the reference position O is used to cut the grinding wheel 3.
is ground down, the workpiece W is finished to a certain size, and is ground to a certain surface roughness.

Next, Fig. 8, Fig. 9, Fig. 10, Fig. 11 and Fig. 1
Figure 2 shows an embodiment in which the present invention is applied to a wheel grinding device for grinding the inner circumferential surface of a workpiece.
, Chuck 31. The dimensional accuracy maintaining device 33 includes a grinding wheel 32 and a dimensional accuracy maintaining device 33, and the dimensional accuracy maintaining device 33 includes a magnetic pedestal 34, a mounting pedestal 35 placed thereon, and a bearing portion 36 of the mount 35.
A first rod 37 provided on the first rod 37, a second rod 38 coaxially screwed onto the first rod 37, a knob 39 for rotational operation attached to the second rod 38, and a fine movement feed mechanism. 40, a lock screw 45, a tip holder 45 connected to the outer end 37' of the first rod 37, and a tip 5
0.

The fine movement feed mechanism 40 has an internal thread 41 formed on the first rod 37 and an external thread 42 formed on the second rod 38.
The feed screw screwed together, the detent key 43 provided on the mounting base 35, and the axial direction Y- formed on the first rod 37.
It has a long keyway 44 in the Y direction, and when the knob 39 is rotated in the forward and reverse directions, the first rod 37 is moved in the axial direction Y2Y by the action of the feed screw, the detent key 43, and the keyway 44. It is now possible to move forward and retreat slightly.

In this embodiment, a single set screw is used as the lock screw 45 constituting the fixing structure of the fine movement feed mechanism 40, and is screwed into a female thread 46 formed on the mounting base 35.
6 is the diametrical axis direction Z-Z of the first rod 37 and △
2. This eccentric position z'-z' is formed at a position Z'-Z' that is eccentric to the center of rotation, and this eccentric position z'-z' is a rotation stopper with respect to the diametrical axis Z-Z of the first rod 37 to which the tip 52 is attached. The key 43 and the keyway 44 are set in a direction in which the surfaces in the direction of transmitting rotational torque when the feed screw is operated in the direction of advancing the first rod 37 can be locked in close contact with each other.

The tip holder 47 is fitted and supported by the protruding end 37' of the first rod 37, and is attached with a set screw 48 so as not to come off. The chip holder 47 is configured so that it can rotate within a range up to a position where it comes in contact with a second stopper 51 that restricts the workpiece W to a position where it does not get in the way when the workpiece is extracted, and a chip 25 is attached to the end of the chip holder 47. It is being

The tip 52 is moved by the fine movement mechanism 40 to the workpiece W.
In the fixed structure of the fine movement feed mechanism 40 of this embodiment, the fine movement feed mechanism 40 is adjusted to match the reference position O of the final finished dimension, and is set to the reference position O by the lock screw 45.
The lock screw 45 is connected to the diametrical axis Z-Z of the first rod 37 between the detent key 43 and the keyway in a direction that transmits rotational torque in the direction of advancing the first rod 31. Eccentric position z'-z where surfaces can be locked in close contact
' Since the first rod 31 is provided in the keyway 4
4 is locked as it is in close contact with the surface 43a of the detent key 43 in the direction of transmitting the rotational torque in the forward direction of the first rod 37 shown by arrow 2 in FIG. The normal reference position O
is definitely set.

After adjusting and setting the tip 52 to the reference position O of the final finishing dimension of the workpiece W, grinding is performed by the grinder 32, and when the grinder 32 is further fed into the cut after reaching the reference position O. Since the grinding wheel 32 is ground with the chip 52, the workpiece W is finished to have constant dimensions and surface roughness.

The present invention has the structure 9 described in detail above, and has a lock screw screwed at an eccentric position z'-z' with respect to the diametrical axis Z-Z of the member to which the tip is attached, so that fine movement is always possible. The non-rotating key and keyway that make up the mechanism are in close contact with the surfaces that transmit the rotational torque when the feed screw is operated in the direction of advancing the member to which the chip is attached. Since it is locked in the position, it is possible to completely eliminate errors in the tip setting position due to backlash between the non-rotating key and the keyway members, and as a result, the tip can be accurately and quickly placed at the reference position of the final finishing dimension of the workpiece. It has a remarkable effect that can be set.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the relationship between the shaking of the fixed member when it is locked and the error in the set position of the tip, and Fig. 2 is an example in which the present invention is applied to a wheel grinding device for grinding the outer peripheral surface of a workpiece. 3 is an enlarged sectional view taken along the line III-III in FIG. 2, FIG. 4 is a plan view of the lock screw, and FIG.
-V line sectional view, Figure 6 is 1. A plan view of the second elongated hole, FIG. 7 is an explanatory diagram of the operation of the main parts of the present invention, and FIG. 8 is a cross-sectional plane of an embodiment in which the present invention is applied to a wheel grinding device for grinding the inner peripheral surface of a hollow workpiece. 9 is a front view of the same, FIG. 10 is a longitudinal sectional side view of the same, FIG. 11 is a longitudinal sectional front view of the same, and FIG. 12 is an explanatory diagram of the same operation. 3...Wheel, 4...The entire dimensional accuracy maintenance device, 6...Mounting base serving as a fixing member, 7...
...Chip holder, 8...1st. Sleeve as one member of the second fixed member, 9... Rod as the other member, 11... Fine movement feeding mechanism,
12...Female thread of the feed screw of the fine movement feed mechanism, 1
3... Same male thread, 14... Detent key 15... Keyway, 16... Chip,
17...Lock screw, 18...First set screw of the lock screw, 24...Second set screw of the lock screw, 27...Mounting base female thread for the lock screw formed on the sleeve, 28.29...the first thread formed on the sleeve. Second long hole, 32...Wheel, 33
...... Entire dimensional accuracy maintenance device, 35...
Mounting base serving as a fixing member, 37°38...1st. The first fixed member is the second fixed member. Second rod, 39...
...Knob for rotating the second rod, 40...
... Fine movement feed mechanism, 41 ... Female thread of the feed screw of the fine movement feed mechanism, 42 ... Same male thread, 43 ...
... Detent key, 44 ... Keyway, 45
... Lock screw, 46 ... Female thread for lock screw formed on mounting base, 47 ... Chip holder, 49 ... Attachment), 50 .5
1...First and second stoppers, 52...
・Chip, O...Reference position for the final finishing dimensions of the workpiece, W...Workpiece, Z-Z...1st. The diametrical axis of the second fixed member, Z'-z'
... Lock screw installation position, △2 ... Eccentric distance, A, C, 2 ... Rotation direction to advance the member to which the chip is attached.

Claims (1)

[Claims for Utility Model Registration] (a) The first part inserted into the fixing member. One of the second fixed members, to which the chip for grinding the grinding surface of the grinding wheel is attached, moves slightly in the axial direction to adjust the chip to the reference position for the final finishing dimensions of the workpiece through a fine movement feed mechanism. (b) The fine movement mechanism is configured to be able to move forward and backward according to the first direction, and the direction in which the chip is advanced to the reference position is the direction in which the member to which the chip is attached advances. A feed screw having a female thread formed on one of the second members to be fixed and a male thread formed on the other member screwed together; A coupling structure in which a detent key provided on one of the second fixed members is fitted into an axially long key groove formed on the other member, (C ) The fixing member is provided with a lock screw for locking the fine movement feed mechanism, and the lock screw is connected to the first
．． With respect to the diametrical axis of the second fixed member, the detent key and the keyway are arranged in a direction that transmits rotational torque when the feed screw is operated in a direction that advances the member to which the chip is attached. A fixing structure for a fine movement feed mechanism in a dimensional accuracy maintenance device for a wheel grinding device, characterized in that the fine movement feed mechanism is screwed at an eccentric center of gravity position that can be locked in a bonded state where the surfaces are in close contact with each other.