JPH05228811A - Grinding and polishing machine for crankshaft, etc. - Google Patents

Abstract

PURPOSE:To grind and polish various kinds of crankshafts or the like different in the space of a pin area and the eccentric diameter by use of only one grinding and polishing machine by displacing and regulating a pair of rotary grinding wheels to conform to the space in a pin area to be ground and polished and the eccentric diameter. CONSTITUTION:Supporting rods 2 are moved forward and backward in the axial direction to adjust the space of pin areas to be ground and polished of a crankshaft to rotary grinding wheels 3, and the lengths of supporting pins 16 are changed to set the rotary grinding wheels 3 in designated spaced positions. The supporting pin 16 is screw-fitted in an eccentric hole 5 of a rotary disc 6 to adjust the rotary grinding wheel 3 to the eccentric diameter of the pin area 1 to fix a movable plate 4, whereby the rotary grinding wheels 3 are turned with eccentricity through the movable plate 45 and grinding wheel supporting arms 7. Further, a pair of rotary grinding wheels 3 are made close to and separated from each other by adjust screws 24, and the space therebetween is set to the finish dimensions of the pin area 1. A grinding and polishing machine is started to grind and polish the pin area 1 to designated finish dimensions by the rotary grinding wheels 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding and polishing machine for pin portions of engine crankshafts, compressors and other eccentric shafts.

[0002]

2. Description of the Related Art For example, in the case of an engine crankshaft, a conventional grinding / polishing machine has the same grinding / polishing for a crankshaft of a 4-cylinder engine and a crankshaft of a 6-cylinder engine or a crankshaft of an 8-cylinder engine. It was impossible to grind and polish with a machine.

Therefore, the present situation is that the grinding and polishing machine dedicated to each crankshaft is used for grinding and polishing.

[0004]

In the above-mentioned conventional technique, since it is not versatile, an efficient grinding / polishing work cannot be carried out, and the number of machines is increased to increase the equipment cost. There is a problem that human rights costs increase because many workers are required.

In view of the above problems of the prior art, the present invention provides a crankshaft capable of highly efficient grinding and polishing by simply performing a displacement adjustment operation for various crankshafts and the like with one grinding and polishing machine. The purpose is to provide a grinding and polishing machine.

[0006]

In order to achieve the above object, a grinding and polishing machine for a crankshaft and the like according to the present invention, for example, as shown in FIGS. Interval a of pin portion 1 to be ground and polished such as axis A
Eccentricity through a pair of rotating discs 6 provided with a plurality of eccentric holes 5 for adjusting the displacement of a movable plate 4 supporting a rotary grindstone 3 to an eccentric diameter b of a pin portion 1 on a support rod 2 which is adjustable in displacement. A pair of grindstone supporting arms 7 having a rotating grindstone 3 is provided on the movable plate 4 so as to be rotatable, and is swingably pivoted to form a crankshaft A.
The main feature is a configuration in which the distance a between the pin portions 1 to be ground and polished and the eccentric diameter b can be freely changed and adjusted.

Further, a rotary grindstone 3 having means for adjusting the displacement of the eccentric diameter b of the pin portion 1 is provided in association with both sides of the support rod 2, and a gap between the rotary grindstones 3 provided on both sides of the support rod 2. Another feature is that c can be adjusted at the mounting portion of the movable plate 4 and the rotary disc 6.

[0008]

Since the grinding / polishing machine for crankshafts and the like of the present invention is constructed as described above, the rotary grindstone 3 is arranged at the interval a between the pin portions 1.
In order to adapt to, the support rod 2 is moved back and forth in the axial direction, and at the mounting portion of the movable plate 4 and the rotary disc 6,
For example, it can be freely adjusted by changing the length of the support pin 16.

In order to adapt to the eccentric diameter b of the pin portion 1, the movable plate 4 can be attached to any one of the plurality of eccentric holes 5 formed in the pair of rotary discs 6, and the displacement thereof can be adjusted freely. You can do it.

When the rotary grindstones 3 having the means for adjusting the displacement of the eccentricity b of the pin portion 1 by the plurality of eccentric holes 5 are provided on both sides of the support rod 2, the machine base becomes compact.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a grinding and polishing machine for a crankshaft and the like according to the present invention will be described below with reference to the drawings.

In the figure, A is a crankshaft, and the crankshaft of the embodiment has two pin portions 1 at the same angular position on both sides and an intermediate portion as shown in detail in FIG. Is configured for a four-cylinder engine having the other two pin portions 1 at the same angle position and the four pin portions 1 between the both end main shafts 8 with a constant space a and an eccentric diameter b. ..

The crankshaft A is mounted so that the pin portion 1 thereof is planetarily rotated about the main shaft portion 8 during grinding and polishing, and is kept horizontal for a predetermined stroke according to a predetermined program by an arbitrary lifting device. It is supported to move up and down.

Reference numeral 2 denotes a support rod which can be displaced and adjusted to an interval a of the pin portion 1 of the crankshaft A to be ground and polished, and includes a guide member 11 having a dovetail groove 10 provided on the lower surface of the machine frame 9 and a guide shaft 12. The guide protrusion 13 and the guide hole 1 provided on the upper end of the
4 and the supporting rod 2 is fitted with the guide member 11 and the guide shaft 1.
It is vertically installed so that it can be freely moved back and forth in the axial direction (horizontal direction) of the crankshaft A to be ground and polished by being guided by the vertical axis 2.

Although the displacement adjustment of the support rod 2 is not shown,
For example, a gauge dial or the like is used to accurately set the gap a of the predetermined pin portion 1 by a simple operation. In the case of the embodiment, the gap between the two support rods 2 is mutually adjusted. ..

Reference numeral 3 is a rotary grindstone for grinding and polishing the pin portion 1 of the crankshaft A, and a grindstone support arm 7 to be described later.
It is attached to the tip end of the disk by means of a grindstone holding device B together with the rotary pulley 15 so that it can freely rotate.

A movable plate 4 is a pair of rotating inner plates 6 provided with a plurality of eccentric holes (for example, screw holes) 5 for adjusting the displacement to the eccentric diameter b of the pin portion 1.
By screwing 6 into a predetermined eccentric hole 5, the eccentric hole 5 is mounted so as to be eccentrically rotated while maintaining a vertical state.

Reference numeral 7 denotes a pair of grindstone support arms, each of which is provided with a rotary grindstone 3 at its tip end, and the base end of which is pivotally supported on the upper end of the movable plate 4 by a pivot pin 17 so that it can be freely rocked. Opposed to each other, the eccentric rotation movement of the movable plate 4 is directly transmitted to the rotary grindstone 3 via the grindstone support arm 7.

An eccentric rotation drive shaft 20 is rotated by a deceleration motor (not shown) through a timing belt 18 and a drive pulley 19 so as to rotate a pair of rotating discs 6 arranged vertically.
The rotation of the above is reduced and transmitted to the upper rotating disk 6 via the small gear 21 fixed to the drive shaft 20 and the large gear 22 integrally fixed on the same axis as the upper rotating disk 6 The rotating disk 6 and the lower rotating disk 6 are connected via the movable plate 4 so as to rotate at the same speed.

However, if the eccentric hole 5 of the rotating disk 6 is matched with the eccentric diameter b of the pin portion 1 of the crankshaft A to be ground and polished, the revolution trajectory d of the pin portion 1 and the revolution trajectory of the support pin 16 are obtained. The revolution trajectory f of the e and the rotary grindstone 3 forms the same trajectory.

The pair of grindstone support arms 7 are inserted into the lower both side plates 23 of the movable plate 4 to rotate the adjusting screw 24 with a gauge screwed into the lower side surface of the grindstone support arm 7. It is possible to separate and approach, and it is possible to adjust the interval to the finishing dimension of the pin portion 1 of the rotating grindstone 3 facing each other.

Further, as the rotation driving means of the rotary grindstone 3, a grindstone rotating drive shaft is rotated by a motor (not shown) at the upper end of a double folding arm 25 that bends and extends following the revolution trajectory f of the rotary grindstone 3. 26, the lower end of which is attached to the lower end of the grindstone support arm 7 by pivoting 27, and the central pivot 28 is provided with a tension pulley 29. And a drive pulley 30 fixed to the drive shaft 26, and a series of rotating belts 31 are spanned via a central tension pulley 29 so that the rotating grindstone 3 can be rotated in a predetermined direction at a constant speed.

However, the rotary grindstone 3 rotates planetarily in synchronization with the pin portion 1 of the crankshaft A while rotating at a constant speed.

Further, the grindstone holding device B has a rotary sleeve 3 having a grindstone mounting flange 32 at one end.
3, a means for connecting the mounting flange 32 of the rotary sleeve 33 and the rotary grindstone 3 in the rotational direction, for example, a knock pin 34 and a means for axially connecting the rotary sleeve and the rotary grindstone 3, for example, a tightening bolt 35. It is said to consist of and.

In the embodiment, a rotary grindstone 3 having a means for adjusting the displacement of the eccentric diameter b of the pin portion 1 is provided in association with both sides of the support rod 2, and the four cylinders are relatively formed from the center thereof. Two sets are provided for grinding and polishing the crankshaft A of the engine.

In the rotary grindstone 3 having means for adjusting the displacement to the eccentric diameter b of the pin portion 1 on the opposite side of the above construction, the large gear 22 is used as it is as the upper rotating disc, and a plurality of large gears 22 are used. The eccentric hole 5 is drilled. However, except for the above-mentioned configuration, it is the same as the one-sided rotary grindstone 3 described above, and thus detailed description thereof will be omitted.

Further, the spacing c between the rotary grindstones 3 on both sides is adjusted so as to match the spacing a of the pin portion 1 by using the support pins 16 having different lengths, and one support pin 16 with a gauge is also provided.
It is also possible to make the same adjustment by rotating the to move it back and forth.

The grinding / polishing procedure of the crankshaft grinding / polishing machine of the embodiment will be described below.

First, the supporting rod 2 is moved back and forth in the axial direction so that the rotary grindstone 3 is adapted to the interval a of the pin portion 1 of the crankshaft A to be ground and polished, and the length of the support pin 16 is changed. The rotary grindstone 3 is set at a predetermined interval position. If the rotary grindstone 3 is provided only on one side of the support rod 2, it is not necessary to adjust the spacing a by the support pin 16.

Then, the rotating disk 6 is adapted to match the eccentric diameter b of the pin portion 1 of the crankshaft A to be ground and polished on the rotating grindstone 3.
The movable plate 4 is attached by screwing the support pin 16 into the predetermined eccentric hole 5 and the rotating grindstone 3 is set so as to eccentrically rotate with a predetermined eccentric diameter via the operating plate 4 → the grindstone support arm 7.

At this time, if the rotary grindstone 3 is set to match the eccentric diameter b of the pin portion 1 to be ground and polished, the pin portion 1
The orbit of revolution d, the orbit of revolution e of the support pin 16 and the orbit of revolution f of the rotary grindstone 3 form the same locus.

Further, the pair of rotating grindstones 3 facing each other are separated and approached by the adjusting screw 24, and the distance is set to the finished size of the pin portion 1.

After that, when the grinding and polishing machine is activated,
The crankshaft A is lifted to a grinding / polishing position by a pair of rotary grindstones 3 and starts to rotate, and the pin portion 1 has both end main shaft portions 8
While rotating around a constant locus d at a constant speed while planetarily rotating, the pair of rotating grindstones 3 arranged on each pin portion 1 rotate at the same locus f as the pin portion 1 at a constant speed. Rotate around.

Therefore, the pin portion 1 is pressed and sandwiched between the pair of rotary grindstones 3 to grind and polish the pin portion 1 to a predetermined finished size by the rotary grindstone 3 due to the difference in rotation between the rotary grindstone 3 and the pin portion 1.

In the grinding and polishing, the pair of rotary grindstones 3 are rotated at the same speed in opposite directions to cancel the grinding resistance, and when the pin portion 1 is pressed and sandwiched between the pair of rotary grindstones 3, these shafts are rotated. It is advisable to press-fit and pinch while grinding until the heart reaches the horizontal line.

When the grinding and polishing process of the pin portion 1 is completed, the crankshaft A descends and escapes from between the rotary grindstones 3, and then the rotation thereof stops and descends to a predetermined position to be transferred by a transfer comparer or the like, and the next crankshaft. It lifts and continuously grinds and polishes.

[0037]

According to the grinding and polishing machine for crankshafts and the like of the present invention, a pair of rotating grindstones can be displaced and adjusted to suit the distance between the pin portions to be ground and polished and the eccentric diameter. With this, grinding and polishing of various crankshafts having different pin intervals and eccentric diameters can be efficiently performed only by performing a simple displacement adjustment operation.

Therefore, due to its versatility, not only the equipment cost and labor cost are reduced as compared with the conventional technology, but also the work efficiency is dramatically improved in combination with the fact that grinding and polishing can be performed in one process.

If rotary grindstones having means for adjusting the displacement of the eccentric diameter of the pin portion by a plurality of eccentric holes are provided on both sides of the support rod, cost reduction and downsizing of the machine base can be realized in combination with the simplification of the structure. ..

Further, when the rotary grindstones are provided on both sides of the support rod, the distance between these rotary grindstones can be freely adjusted at the mounting portion of the movable plate and the rotary disc, for example, by changing the length of the support pin. Therefore, together with the displacement adjustment of the support rod, the rotary grindstone can be accurately adapted to the interval between the pin portions to be ground and polished.

When the above effects are put together, the rationalization will be greatly improved as compared with the conventional technique which requires the increase of the number of machines, and the cost can be remarkably reduced in combination with the simplification of the structure and the reduction of the equipment cost.

[Brief description of drawings]

FIG. 1 is a partially cut front view showing an embodiment of a grinding and polishing machine for a crankshaft and the like according to the present invention.

FIG. 2 is a cutaway side view of the same portion.

FIG. 3 is a side view showing an example of a rotating disc.

FIG. 4 is a plan view showing relational positions of a crankshaft and a rotary grindstone.

FIG. 5 is a side view showing an operating state of a pin portion, a support pin and a rotary grindstone during grinding and polishing.

[Explanation of symbols]

 A crankshaft 1 pin part 2 support rod 3 rotating grindstone 4 movable plate 5 eccentric hole 6 rotating disk 7 grindstone support arm a pin part spacing b eccentric diameter of pin part

Claims (3)

[Claims] 1. A movable plate (3) for supporting a rotating grindstone (3) on a support rod (2) which is capable of displacement adjustment at an interval (a) of a pin portion (1) to be ground and polished such as a crankshaft (A). 4) is provided so as to be eccentrically rotated via a pair of rotating discs (6) having a plurality of eccentric holes (5) for adjusting the displacement to the eccentric diameter (b) of the pin portion (1), and the movable plate. A grinding and polishing machine for a crankshaft or the like, characterized in that a pair of grindstone support arms (7) having a rotating grindstone (3) are pivotally provided in (4). 2. The eccentric diameter (b) of the pin portion (1) according to claim 1.
A grinding and polishing machine for a crankshaft and the like, in which rotary grindstones (3) having means for adjusting displacement are provided in association with both sides of a support rod (2). 3. The distance (c) between the rotary grindstones (3) provided on both sides of the support rod (2) can be adjusted at the mounting portion of the movable plate (4) and the rotary disc (6). Grinding and polishing machine for crankshafts, etc.