JPS6031622B2 - How to set eccentricity in crankshaft machining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for setting the amount of eccentricity when grinding a pin portion or a journal portion of a crankshaft.

Conventionally, a workpiece gripping device for a grinding machine that grinds a pin part or a journal part of a one-sided crank ball has a V-shaped bracket fixed to the end face of a rotating main shaft, with its groove direction parallel to the main shaft axis. A presser facing the warp is rotatably provided with a fluid cylinder or the like, and the crank track is analogous to the case where the journal portion is placed on the V-shaped receiver and is pressed by the presser against the spindle axis. The journal portion was gripped eccentrically.

In this gripping device, when the amount of eccentricity of the crankshaft changes, the V-shaped receiver is replaced to change the eccentric position of the journal portion to be gripped, for example. This V-shaped support replacement work has the drawback that it is slow and time consuming because a sizing device and the like are placed on the table. In view of the above, the present invention is a method for setting the amount of eccentricity D, which is aimed at setting the amount of eccentricity D within a short time. Focusing on the fact that the envelope circle diameter D due to the revolution around the rotation axis becomes D=d+uneven, a zero master gauge with an outer diameter D and a body mass master gauge with an outer diameter d are prepared, and the gripping axis D The fog master gauge is held by a rotary drive device that can continuously change the amount of eccentricity of the rotary drive device, and this outer law D is measured with a sizing device in a stopped state, and then the rotary drive device is made to grip the eccentricity setting master gauge. Rotate this and measure the envelope circle diameter due to the revolution of the eccentricity setting master gauge around the rotation axis using the sizing device. This is a method of setting the offset zero amount by changing the position.

Embodiments of the present invention will be described with reference to the drawings.

A table 1 is placed on a bed (not shown) facing the grindstone 2.

Reference numeral 3 denotes a base mounted on the table 1, which is fixed to the tape with unillustrated bolts.

On the table 1, an unillustrated headstock is mounted on the left side of the base 3 shown in FIG. Reference numeral 4 denotes a sleeve, which is supported on the base 3 with its axis 0 aligned with the center of the main shaft supported on the ball stand. Reference numeral 5 denotes an eccentric stem, and its bag center 02 is rotatably mounted in the sleeve 4 with an eccentric amount E relative to the sleeve axis ○.

Reference numeral 6 denotes an eccentric hole, and its center hole 03 is eccentrically drilled from the end surface opposite to the headstock toward the spindle side with an eccentric amount E equal to the eccentric amount E with respect to the eccentricity 02. It is set up.

7 is a lid, and an eccentric shaft 5 protrudes from the sleeve 4 toward the opposite side of the headstock.
The end portion is covered, and the collar portion 5a of the eccentric shaft 5 is pressed against the end surface of the sleeve 4 by means of a bolt 8 attached, thereby tightening the eccentric shaft 5 to the sleeve 4. Reference numeral 9 is a bracket fixed to the end surface of the main shaft side of the sleeve 4 to cover the protruding part of the eccentric pulp 5, and the protruding part 9a formed toward the main shaft can be engaged with a drive pin 10 provided on the end surface of the main shaft. As a result, the rotation of the main shaft is transmitted to the sleeve 4.

Reference numeral 11 denotes a worm shaft, the axis of which is spaced apart from the eccentric axis Q by a predetermined distance and perpendicular to it, and a grip 12 with both ends protruding outward from the bracket 9 is fixed to the end of the worm shaft.

Numeral 13 denotes a worm wheel, which is secured to the end of the eccentric shaft 5 on the main shaft side with a key, and its toothed surface meshes with the worm shaft 11.

Thereby, by rotating the grip 12 by an appropriate amount, the amount of eccentricity of the eccentric hole 6 of the eccentric shaft 5 rotated in the sleeve 4 from the sleeve axis center ○ can be set steplessly from 0 to irregularly. 14 is a cylinder whose center is aligned with the eccentric shaft 5
is fixed to the main shaft side end surface 5a.

15 is a piston mounted in the cylinder 14 and an eccentric shaft 5
A piston rod 15a having a smaller diameter is integrally formed toward the side.

In the cylinder 14, a compression spring 17 is inserted into a front chamber 16 near the eccentric shaft 5, which is divided by a piston 15, and pressure oil is supplied to a rear chamber 18 on the opposite side through a three-way solenoid valve 19. ing. A plunger 20 is provided at the center of the eccentric shaft 5 on the side of the end surface 5a so that the plunger 20 can be moved in the direction of the sea bream line.The tip protrudes from the end surface 5a and comes into contact with the piston rod 15a, and the rear end is bored inside the eccentric shaft 5 to form an eccentric hole. The inside of the flow path 21 reaching 6 is iron-clad. A bush 22 is press-fitted into the eccentric hole 6, and its inner diameter is the same as the outer diameter of the gripping part of the workpiece.
The central portion other than the narrow width portions at both ends adjacent to the center portion has a small diameter and thin outer periphery, and a fluid chamber 23 is formed between it and the eccentric hole 6.

An incompressible fluid is sealed in the flow path 21 and the fluid chamber 23, and when pressure oil is supplied to the rear chamber 18 of the cylinder j4 through the three-way solenoid valve 19, the thrust of the piston turtle 5 is is transmitted through the plunger 20 and the incompressible fluid, and the bush 22 is compressed and deformed to grip the workpiece. Conversely, when the three-way solenoid valve 19 is switched to the discharge side, the pressure oil in the rear chamber is discharged by the biasing force of the compression spring 17, the piston 15 retreats, and force is no longer transmitted via the plunger 20 and the incompressible fluid to the bushing. The compressive deformation of 22 is restored and the grip on the workpiece is released. Hereinafter, the above-mentioned movements for compression deformation and recovery from compression deformation of the bush 22 will be referred to as chuck tightening and chuck loosening. Next, the sizing device 40 used for setting the amount of eccentricity and controlling the dimensions of the grinding process will be explained.

41 is a lower stand fixed facing the upper whetstone 2 of the table 1;
2 is a cylinder fixed on the lower table.

Reference numeral 43 denotes a piston rod of the piston 2 which is iron-mounted on the cylinder 42, and 44 denotes a guide shaft which is slidably provided in the cylinder 42, and the chest 45a of the measuring head 45 is fixed to the shaft end which protrudes outward. has been done.

The measuring head 45 has a vertical sliding surface 45b on the side surface on the grinding wheel side.
is engraved. 46 is an upper detector, 46' is a lower detector, and upper and lower contacts 47 and 4 each extend toward the grinding wheel side.
7', and is provided on the sliding surface 45b so as to be able to slide and tighten. The upper and lower detectors 46 and 46' both incorporate differential transformers that generate voltages according to the turning angles of the upper and lower contacts 47 and 47'. The control system of the sizing device 40 will be explained with reference to FIG. In the following description, the same elements are distinguished by the difference between upper and lower parts by adding '' to the lower element. 46, 46' are the detectors, 48, 48' are amplifiers that amplify the outputs of the detectors 46, 46', and 49, 49' are synchronous rectifiers that rectify the outputs of the amplifiers 48, 48'.

Reference numerals 50 and 50' denote time constants, which charge the outputs of the synchronous rectifier circuits 49 and 49' into built-in capacitors when the contacts 47 and 47' are in contact with the object to be measured.
When ' is separated from the object to be measured, the signal voltage charged in the capacitor is discharged with a time constant.

These time constants 50 and 50' are used when measuring external light objects such as splines that do not have a circular cross section, and are
When 7,47' moves from the peak to the valley of the spline, the measured value of the diameter of the peak is maintained until the diameter of the next peak is measured. If the object to be measured has a circular cross section, the synchronous rectifier 49
, 49' are connected to the arithmetic unit described later, and time constant units 50, 50'
is not used. 51 is an arithmetic unit that adds the outputs G, G2 from the synchronous rectifiers 49, 49' or time constants 50, 50'; 52 is an indicator that displays the output of the arithmetic unit 51;
Reference numeral 63 denotes a signal generator that outputs command signals for cutting speed conversion, sizing, etc. to the cutting control circuit of the grinding machine when the output of the calculator 51 reaches a preset dimension.

Next, we will explain the final machining of the journal pin of the crankshaft that is the workpiece, the eccentricity E, and the setup parts for setting the eccentricity when grinding the pin part. The dew master gauge M is formed into a concentric cylindrical shape with an outer diameter of do and D, and the eccentricity setting master gauge M2 has an outer diameter of d.
(=D-section) is formed in the same D cylindrical shape. There is no relationship between the pin final machining flea Do and the outer diameter D of the master gauge M, in terms of setting the eccentricity, but if Do = D, then the upper and lower contacts 47, 47 will be removed when starting the crankshaft grinding process.
There is no need to set the machining diameter. Next, the eccentricity setting operation will be explained.

■ Connect the changeover switch SWI to the time constant device 50, 50' side.

■ Insert the outer diameter of the droplet master gauge M into the bush 22 and tighten the chuck.

(2) The sleeve 4 is rotated by the rotation of a main shaft (not shown), and the eccentric hole axis 03 is positioned in a substantially perpendicular plane of the sleeve axis 0.

At this time, the amount of eccentricity of the eccentric hole axis 03 with respect to the sleeve axis o does not need to be zero, and the zero master gauge M described later
, it is sufficient that the zero master gauge M is located within the measurement range of the contacts 47, 47' during measurement. (The amount of eccentricity at this point is E2.) (2) Move the measuring head 45 forward and measure the outer diameter D of the zero master gauge M.

At this time, the sleeve 4 is in a stopped state. ■ After retracting the measuring head 45, loosen the chuck and remove the master gauge M.

■ Insert the outer diameter part of the eccentricity setting master gauge M2 into the pusher 22 and tighten the chuck.

(2) Rotate the sleeve 4 and move the measuring head 45 forward to measure the envelope diameter of the outer diameter d due to the revolution of the eccentric amount setting master M2 around the sleeve axis o. (The measured value at this point is D2 = d+ is 2.) ■ Measuring head 45
, and the rotation of the sleeve 4 is stopped.

■ Loosen the bolt 8 that secures the eccentric shaft 5 to the sleeve 4.

■ Turn the grip 12 in the direction so that the measured value D2 in item ■ matches the measured value D in item ■.

As a result, the eccentric shaft 5 is rotated via the worm shaft 11, and the amount of eccentricity of the eccentric hole 6 with respect to the sleeve axis ○ is changed. ■ Tighten the bolt 8.

■ Until the measured value D2 in section ■ becomes D. Repeat steps ■～■.

After the eccentricity is set by the above operation, switch the changeover switch SWI to the time constant 50, 50' side for inconvenience.
Furthermore, the journal portion of the crankshaft is inserted into the bush 22, the axis of the pin portion is positioned near the sleeve axis o, and the chuck is tightened.

When the diameter D of the zero master gauge M matches the pin final machining flea Do, the machining operation can be started immediately. Further, based on the above embodiment, a servo motor is connected to the worm shaft 11, and the servo motor is connected to the zero master gauge M.
, and the eccentricity setting master gauge ground can be used to control the eccentricity and set the eccentricity. Furthermore, it is also possible to provide a register for storing the value of the outer diameter D as a reference without using a zero master gauge, and to perform a comparison calculation with the measured envelope circle diameter. As mentioned above, the present invention can set the eccentricity in crankshaft machining by using a rotary drive device that can continuously change the eccentricity and is equipped with a crankshaft gripping means, a sizing device that controls dimensions during machining, and a D=d+machine. Using a zero master gauge with an outer diameter D and an eccentricity setting master gauge with an outer diameter d, measure the outer diameter D of the zero master gauge with the sizing device, and then set the eccentricity setting master gauge. Measure the envelope circle diameter of the outer diameter d, and if the envelope circle diameter is zero, the outer diameter of the master gauge ○
Since the target eccentricity E is set by changing the amount of eccentricity so as to match the amount of eccentricity, there is no need to replace parts of the crankshaft gripping device to change the amount of eccentricity, and the change can be performed in a short time.

Also, there is no need to check whether the set eccentricity matches the target value. Furthermore, if the outer diameter of the zero master gauge is adjusted to the final dimension of the workpiece, it is possible to proceed to actual machining immediately after setting the eccentricity.

[Brief explanation of drawings]

1 is a 1-1 sectional view of an embodiment of the present invention in FIG. 2, which will be described later. FIG.
m sectional view, Fig. 4 is a zero master diagram, Fig. 5 is a measurement state diagram of the zero master, Fig. 6 is an eccentricity setting master diagram, Fig. 7 is a measurement state diagram of the eccentricity setting master, and Fig. 8 is a diagram of the measurement state of the eccentricity setting master. FIG. 2 is a block diagram of a sizing device. 3...Base, 4...Sleeve, 5...Eccentric shaft, 6...
... Eccentric hole, 22 ... Bush, 40 ... Sizing device, 0, ... Sleeve axis, 02 ... Eccentric hole axis, ground
...Eccentricity setting master gauge. Figure 1 Figure 2 Figure 3 Figure 4 Border S Figure 6 Younger brother Wa Figure Grandchild Figure 8

Claims (1)

[Claims] 1. The crankshaft drive device is configured to continuously vary the eccentricity of the rotating body, which has gripping means for gripping the journal part or the pin part of the crankshaft by a predetermined eccentricity from the rotation axis. After a rotating body holds a cylindrical eccentricity setting master gauge with an outer diameter d, the rotating body is rotated, and the envelope diameter of the eccentricity setting master gauge around the rotation axis is measured with a sizing device. , setting the target eccentricity by displacing the gripping axis of the rotating body relative to the rotational axis so that the envelope circle diameter becomes d (eccentricity setting master gauge diameter) + 2×E (target eccentricity); A method for setting eccentricity in crankshaft machining, characterized by: