JPH0192068A - Feeding of coolant in grinding work - Google Patents

Abstract

PURPOSE:To suppress the generation of clogging by smoothly discharging the grinding chips by supplying coolant into the nonworked surface side opened port of a feeding passage formed inside a workpiece and allowing said coolant to flow into between the worked surface and a polishing cloth from the worked surface side opened port. CONSTITUTION:In the state where a polishing paper 28 is pressed onto the journal part 16 of a crankshaft 10 by a shoe, the crankshaft 10 is revolved, and grinding work is carried out by the polishing paper 28. In this case, a coolant feeding arm 82 moves, following the revolution of the crankshaft 10, and the coolant supplied from a coolant feeding source is supplied from the liquid passage 88 of the arm 82 into the non-worked surface side opened port of a feeding passage 80 formed inside the crankshaft 10. Further, the coolant is discharged from the worked surface side opened port of the feeding passage 80 which communicates to the nonworked surface side opened port, and flows into between the outer peripheral surface of the journal part 16 and the polishing cloth 28, and working chips are discharged. Therefore, clogging of the polishing paper 28 is suppressed, and the grinding work precision can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for supplying coolant when grinding is performed using coated abrasive paper.

BACKGROUND OF THE INVENTION 2. Description of the Related Art Grinding a workpiece using abrasive cloth paper is already known from Japanese Patent Laid-Open Publication No. 121457/1983.

Abrasive coated paper is made up of an abrasive material adhered to the surface of a flat base material made of 9 cloth, 2 paper sheets, 2 synthetic resin sheets, etc., and is brought into surface contact with the workpiece, and the workpiece is moved by relative movement with the workpiece. Grind things. During grinding using such coated abrasive paper, coolant is sometimes supplied while processing. Conventionally, coolant was applied from outside the contact area between the coated abrasive paper and the workpiece using a nozzle, etc. .

Problems to be Solved by the Invention However, since the coated abrasive paper is ground in surface contact with the workpiece, there are areas between the workpiece and the coated abrasive paper where it is difficult for coolant to enter. Easy to get clogged,
There have been problems such as reduced grinding efficiency and uneven grinding, resulting in reduced machining accuracy.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a feed passage formed on the non-processed surface side of the workpiece, which is formed in a state in which the processed surface and the non-processed surface communicate with each other. A coolant supply device supplies coolant to the opening, and the coolant flows out between the processing surface and the coated abrasive paper from the processing surface side opening of the supply passage.

Functions and Effects According to the coolant supply method according to the present invention, coolant is forcibly supplied between the processing surface of the workpiece and the abrasive coated paper. Therefore, the grinding powder is efficiently discharged, the occurrence of clogging is suppressed, and the effects of improving machining accuracy and machining efficiency can be obtained.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows a diagram suitable for carrying out the method according to the invention.
1 is a diagram schematically showing a grinding device equipped with a runt supply device, and in the diagram, 10 is a crankshaft of an engine, which is a workpiece. This crankshaft 10 is for a six-cylinder engine, and has a journal portion 16 concentric with the shaft portions 12 and 14 at both ends.
Six eccentric pin portions 18 are provided alternately. The grinding device of this embodiment grinds a journal portion 16, and the shaft portion 12 is gripped by a chuck 22 provided on the main shaft (not shown) of a headstock 20, while the shaft portion 14 is held by a tailstock. It is supported by the center 26 of the stand 24, rotated by the rotation of the main shaft, and the journal portion 16 is ground by an abrasive paper 28. In addition, the headstock 2
0. The tailstock 24 is moved in the longitudinal direction of the crankshaft 10 by a moving table (not shown), and each time the machining of one journal portion 16 is completed, the next journal portion 16 to be ground is moved to the machining position. be moved to. However, it is also possible to grind all the journal parts 16 at the same time.

The abrasive paper 28 is attached to the journal portion 1 as shown in FIG.
6 from above, and is pressed against the journal portion 16 by a pressing device 32 during grinding. The pressing device 32 comprises a pair of arms 36, 38 rotatably supported by an axle 34. Arm 36
．． 38 is a rod-like member with a rectangular cross section that is curved, and a thin part whose thickness is half that of the other parts is formed in the center part in the longitudinal direction, and a through hole formed in the center of the thin part. Although it is possible to rotate relative to the shaft 34, it is fitted so that it cannot move relative to the shaft 34 in the axial direction.

The shaft 34 is supported above the crankshaft 10 by a frame (not shown), parallel to its axis, and immovable in the axial direction, and an arm 36.38 at its lower end supports the journal portion 16 in the diametrical direction. It is designed so that it can be pinched from both sides. The upper ends of the arms 36 and 38 each have a yoke portion 40 as shown in FIG.
．． 42 is formed, and a hydraulic cylinder 46 is attached to the yoke portion 40 of one arm 36 with a bracket 48 . bottle 50
It is rotatably attached. hydraulic cylinder 4
The piston rod 52 of No. 6 is extended to the other yoke portion 42 side through a notch 54 of the yoke portion 40, and the connecting portion 56 at the tip thereof is fitted into the notch 58 of the yoke portion 42, and the pin 60 The arm 36 is rotatably connected to the
．． 38 is opened and closed.

The lower ends of the arms 36, 38 are opposite each other and each has a shoe 64.38 inside thereof, as shown in FIG.
66 is fixed. The mutually opposing inner surfaces 68, 70 of these shoes 64, 66 are partially cylindrical surfaces that are concentric with the journal portion 16 and have a diameter larger than the diameter of the journal portion 16, and have protrusions 9 in pairs. 72.74
are formed respectively. These four protrusions 72 in total
74 are provided at equiangular intervals when the arms 36 and 38 are closed, and their inner surfaces form partial cylindrical surfaces concentric with the journal portion 16, and the abrasive paper 28
is pressed against the journal portion 16.

The abrasive paper 28 is made of a flat base material made of paper impregnated with synthetic resin and made water resistant, with granular abrasive material adhered to one surface of the paper using a water resistant adhesive, and is shaped like a long belt. I will do it. This abrasive paper 28 is supplied from a supply drum (not shown), is wound up by a winding drum, and is fed intermittently at a constant pitch. The abrasive paper is not sent continuously, but at predetermined intervals or each time the processing of one journal portion 16 is completed, it is sent by a certain length that is equal to or less than the length required for processing. be.

Inside the crankshaft 10, as shown in FIG. 2, there is a supply passage 80 whose both ends open to the outer circumferential surface (processed surface) of the adjacent journal portion 16 and the outer circumferential surface (unprocessed surface) of the pin portion 18. Six lines are formed. When the engine is assembled, the journal part 16 is rotatably supported by the cylinder block, and the connecting rod is connected to the pin part 18. A supply passage 80 for supplying lubricating oil to each section.
is being formed. When grinding the journal portion 16, as shown in FIG. 1, a coolant supply arm 82 is attached to the pin portion 18 to supply coolant to the journal portion 16.

The arm 82 includes a rod 84 and an annular member 86 attached to the tip of the rod 84. The rod 84 has a liquid passage 88 extending in the axial direction formed therein, and is connected to a coolant supply source via a crank (not shown) at the end opposite to the side to which the annular member 86 is attached. It is connected so that coolant is supplied to the liquid passage 88 even in the position. Further, the annular member 86 is made up of two semicircular annular members 90 and 92 connected at one end so that they can be opened and closed by rotation, and the pin part 18 is sandwiched from both sides in the diametrical direction. A rod 84 is fixed to the semicircular annular member 90. The annular member 86 has a supply passage 80 that opens on its inner peripheral surface.
An annular passageway 94 is formed which communicates with the opening of the
A liquid passage 96 is formed that penetrates the semicircular annular member 90 in the radial direction and communicates the annular passage 94 with the liquid passage 88 of the loft 84. ．． The supply passage 80 is supplied from the annular passage 94 . The arm 82° coolant supply source and the like constitute a coolant supply device. Note that seal members 98 are provided on both sides of the annular passage 94 to prevent coolant from leaking.

In the grinding device configured as described above, the journal portion 16 has the abrasive paper 28 wrapped around it, and the arm 36.
38 is closed and the abrasive paper 28 is rotated and ground while being pressed by the shoes 62, 64. On this occasion,
The arm 82 moves following the rotation of the crankshaft 10, and the coolant supplied from the coolant supply source is
Liquid passage 88, liquid passage 96. From the annular passage 94 to the supply passage 8
0 and flows out between the outer peripheral surface of the journal portion 16 and the abrasive paper 28, and discharges the grinding powder. The position of the opening on the journal part 16 side of the supply passage 80 relative to the abrasive paper 28 changes with the rotation of the crankshaft 10, and
Coolant is evenly supplied between the contact portion of the abrasive paper 28 and the journal portion 16, and the grinding powder is washed away. This reduces clogging of the abrasive paper 28,
The effect of improving grinding efficiency and processing accuracy can be obtained.

Further, since a supply passage 80 is formed in the crankshaft 10 to lubricate the journal portion 16 and the like,
There is an advantage that coolant can be easily supplied.

However, the method according to the present invention can also be carried out on workpieces such as crankshafts in which a supply passage that communicates the machined surface and the non-processed surface is not formed for other purposes by providing a coolant supply passage. .

In the above embodiment, the coolant was supplied to the supply passage 80 by the coolant supply arm 82, but as shown in FIG.
It may also be supplied from the center 101. A supply passage 104 is formed in the workpiece 102 , one end of which opens at two locations diametrically apart on the outer peripheral surface of the workpiece 102 , and the other end of which opens at an end face supported by the Shinshindai 100 . A liquid passage 106 is provided inside the liquid passage 106 , one end of which is open to the outer peripheral surface thereof, and the other end of which communicates with the supply passage 104 . A hose 10 connected to a coolant supply source is provided at the opening of the liquid passage 106 on the outer peripheral surface side of the center 101.
8 are connected, and when the workpiece 102 is rotated by the rotation pin of the headstock 110 and ground by the abrasive paper 114 pressed by the arm 112, the coolant flows through the hose 108. Liquid passage 106. The abrasive paper 114 is supplied through the supply passage 104 between the outer peripheral surface of the workpiece 102 and the abrasive paper 114 . Center 101. Hose 108. The coolant supply source and the like constitute the coolant supply device.

In the above embodiment, the abrasive paper 20 is fed intermittently at a constant pitch, but it may be fed continuously.

Further, in each of the above embodiments, the abrasive cloth paper is a rolled abrasive paper, but the present invention can also be applied when polishing is carried out using a rectangular sheet-like abrasive cloth paper or an endless belt-like abrasive cloth paper. Can be applied.

Although not illustrated in detail, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing the main parts of a coolant supply device for carrying out the method of the present invention. FIG. 2 is a front view schematically showing the main parts of the grinding device equipped with the coolant supply device. FIG. 3 is a front view showing the abrasive paper pressing device in the grinding device, and FIG. 4 is a plan view. FIG. 5 is a front sectional view showing the main parts of another coolant supply device for carrying out the method of the present invention. 10: Crankshaft 16: Journal part 18: Pin part 28: Abrasive paper 80: Supply passage 82:
Coolant supply arm 101: center 10
2: Work 104: Supply passage 108: Hose 1
12: Arm 114: Grinding Figure 2 Figure 4

Claims (1)

[Scope of Claims] A method for supplying coolant to the machined surface during grinding by bringing a coated abrasive paper into surface contact with the workpiece and moving relative to the workpiece, the method comprising: The coolant is supplied by a coolant supply device to the opening on the non-processing side of the supply passage formed to communicate the processing surface and the non-processing surface, and the process surface and the abrasive coated paper are connected from the opening on the processing side of the supply passage. A method of supplying coolant characterized by causing the coolant to flow out between the two.