JPS6144502A - Turning device for turning shaft workpiece - Google Patents

Abstract

PURPOSE:To enable the processing of a small shaft workpiece on a device for turning the end of a crankshaft or the like, by securing a work spindle heat to a bed, and moving both tailstocks in the same direction rightward and leftward synchronously with each other. CONSTITUTION:Tailstocks 2, 2 are synchronously moved rightward by a cylinder 12. A center shaft 2a on the left-hand tailstock 2 is inserted into the rotary sleeve 5 of a work spindle head 3. The right-hand tailstock 2 is slightly moved back rightward by a clamping cylinder 13. A workpiece W is inserted in between both the tailstocks 2, 2. The right-hand tailstock 2 is moved leftward to pinch and hold the workpiece W between both center shafts 2a, 2a. Both the tailstocks 2, 2 are then synchronously moved leftward to insert the halfway portion of the workpiece W into the rotary sleeve 5 to clamp the workpiece. This constitution enables the processing of even a small workpiece.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a turning device for a shaft workpiece, which is used for turning both ends of a crankshaft or other shaft workpiece.

(Prior Art) As a conventional device of this type, as disclosed in Japanese Patent Application Laid-Open No. 15601/1987, a bed is provided with a pair of left and right tailstocks for holding a workpiece consisting of a crankshaft, and an intermediate between the two tailstocks. A work spindle main shaft head comprising a rotary cylinder surrounding the workpiece and a clamp member for gripping the middle part of the workpiece in its entirety is attached to the workpiece spindle head, and the workpiece is rotated around its axis by rotation of the rotary cylinder. While rotating the workpiece ii [i
It is known that the i-end is turned by a pair of left and right turret heads on the bed.

In this model, the spindle head is movable left and right so that it does not get in the way when setting a workpiece between both tailstocks, and the center shaft on the spindle head rotates. The workpiece is set between the center shaft and the center shaft on the psychological table on the other side while the workpiece is moved to the standby position on one side that protrudes through the entire barrel, and then the workpiece is moved from the spindle head fully standby position to the standby position on both sides. It is moved to a predetermined operating position in the middle of the tailstock to grip the workpiece and rotate it.

(Problems to be Solved by the Invention) In general, crankshaft turning requires a large amount of power and requires heavy cutting, so it is necessary to have a high rigidity of the spindle head, and in particular, it is necessary to have a spindle head that can freely move left and right as in the above-mentioned conventional technology. When this is the case, it is necessary to increase the horizontal dimensions of the sliding part in order to suppress backlash and increase support rigidity.In this case, both ends of the workpiece do not protrude to the left and right sides of the spindle head. Since it is not possible to perform turning processing, the workpieces that can be processed are limited to relatively long crankshafts for multi-cylinder engines due to the increase in size in the left and right direction, and the power transmission member to the rotating cylinder is moved in line with the spindle head. This has the disadvantage of making the configuration complicated and making the device expensive as a whole.

SUMMARY OF THE INVENTION In order to eliminate such inconveniences, it is an object of the present invention to provide an inexpensive device that can also process small crankshafts for use with a small number of cylinders.

(Means for Solving the Problems) In order to achieve the above object, the present invention fixes the work spindle head to the bed and allows both tailstocks to move left and right in the same direction in synchronization with each other. It is characterized by

(Example) The present invention will be explained with reference to the illustrated embodiments.

With reference to FIGS. 1 and 2, (1) indicates a bed;
The bed (11) has a pair of left and right tailstocks (21121,
The work spindle head (3) in the middle, and a pair of left and right turret heads (
Place 41+41 and next.

As shown in FIGS.
), the rotary cylinder (5) is provided with a suitable position in the middle of the workpiece W,
For example, the crank web Wat - the clamp member that grips it (
61t- is attached to the workpiece wt- and is configured to rotate around its axis by the rotation of the rotation 'M+51. The rotary cylinder +51't is pivotally supported in a through hole, and is driven by a υ belt by a drive motor (not shown) at a pulley (8) at one end, and the rotary cylinder (
5) A peripheral seat (6 &) that grips the crank web Wa1 at the other end, a clamp arm (6b) on the other side opposite to this, and a wedge piece (6) that presses and swings the arm (6b).
0) is attached, and the wedge piece (
6o) is set on the outer surface of the machine body (7) to allow a swinging and movable operating arm (9) to press the clamp arm (6b) and release the grip on the crank web W&. In the drawing, (9a) indicates a cylinder for advancing and retracting the operating arm (9), and (9'o) indicates a swinging rack cylinder that swings via the arm (911t binion (9c)).

Here, according to the present invention, the main shaft if +31't bed ill is fixed, and both tailstocks t21 +21't
- They can be moved left and right in the same direction in synchronization with each other. To explain this in more detail, in the illustrated model, the spindle head (3) is fixed to the bed (1) in the body (73). , a slide pace Uασ [1 is provided on both sides of the spindle head (3) of the bed tl+, and each slide pace (11)
Each tailstock (2) is supported slidably in the left and right direction, and the spindle head (3) is supported on both tailstocks t21 +211.
) are connected to each other via synchronous iron α11 extending through the fuselage (7), and this is attached to the left tailstock (2) with a cylinder α that can slide against the slide base (1 (i). The cylinder t17J is connected to the left tailstock (2
), and further the right tailstock (2) via the rod αDf:
and can move left and right in the same direction in synchronization with each other.

In the illustrated example, the right tailstock (2) is connected to the synchronizing rod αυ through a clamp cylinder a3t so as to give a constant stroke of horizontal movement, and the left tailstock (2) is moved by the cylinder (13). The work Wt- can be set between the center shafts (2a) (2a) on both tailstocks +2+ +21 by moving the tailstock (2) left and right.

Each of the turret heads +41 is directed toward the edge of the workpiece W;
That is, each motor (4a) (4b) in the left and right direction and in the radial direction.
The positioning of each end of the workpiece W is controlled in preparation for turning.

(Function) To explain the function of the present invention based on the above embodiment, first, both tailstocks t21+21 are synchronously moved to the right by the operation of cylinder U, and Center axis (2&)
is inserted into the rotary cylinder (5) of the work spindle head (3), and with the right tailstock (2) moved slightly to the right by the operation of the rough ramp cylinder αJ, the both tailstocks t21 (
Insert the workpiece W between the center shafts (2a) (2a) of the 2+, then move the right tailstock (2) forward to the left by actuating the cylinder α, and move the center shafts (2a) ( 2a) The work w'l is held between the two tailstocks (21(2)
is synchronously moved to the left by the operation of cylinder α3.

In this case, the intermediate part of the workpiece W is inserted into the rotary cylinder (51), and the clamp member (6) attached to the rotary cylinder (5)
) When the pressure of the wedge piece (6o) by the operating arm (9) is released, the clamp arm (6b) is moved by the biasing force of the wedge piece (60).
is pressed and swung by the catch seat (6 &) ca, and the work W is gripped by the crank web Wa at the rotation IN +51, and the work W is rotationally driven around its axis by the rotation of the rotary cylinder (5). Each turret head at both ends of the lever +4
Turning is performed by J.

(Effects of the Invention) As described above, according to the present invention, the work spindle head is fixed to the bed, and both tailstocks are movable left and right in the same direction in synchronization with each other. This makes it possible to set the workpiece between the two tailstocks and insert the workpiece into the rotary cylinder of the spindle head, and the support rigidity is higher than that of a spindle head that is movable left and right. The horizontal dimension required to ensure this is short, making it possible to process small workpieces, and there is no need to move the power transmission member to the rotary cylinder along with the spindle head, making the device as a whole less expensive. It has the following effects.

[Brief explanation of the drawing]

Figure Mc1 is a front view of one example of the device of the present invention, Figure 2 is a side view thereof, Figure 5 is a sectional view taken along the tu-tnn line in Figure 2, and Figure 4 is a view taken from the line IV-[V in Figure 3. Side view of the spindle head, No. 5
The figure is a sectional view taken along the line v-v in FIG. 4. fi+・・・Bed (2)・
...Tailstock (31...Work spindle head (41...Turret head)
(5)...Rotating cylinder (6)...Clamp member! 〃・・・・・・Procedure amendment form for 2 people outside of work)

Claims (1)

[Claims] The bed has a pair of left and right tailstocks for holding a crankshaft or other shaft workpiece, and a rotary cylinder that surrounds the workpiece located between the two tailstocks, which grips the workpiece at a proper position in the middle. A work spindle main shaft head is provided with a clamp member attached thereto, and the work is rotated around its axis by rotation of the rotary drum, and both ends of the work are moved between a pair of left and right sides on the bed. 1. A turning device for a shaft workpiece, which performs turning processing using a turret head, characterized in that the spindle head is fixed to the bed, and both tailstocks are movable left and right in the same direction in synchronization with each other.