JPH04201105A - Multi spindle gear head - Google Patents

Abstract

PURPOSE:To alter the position of a work tool with easy operation by providing an eccentric cylinder with close-fitting holes rotatably at positions eccentric to a rotating center shaft on a head body, holding a rotating shaft rotatably in the eccentric cylinder, and positioning the eccentric cylinder at a specified rotating position. CONSTITUTION:A drive shaft 20 is rotated by an electric motor to rotate work tools mounted at the top of rotating shafts 13 to 16 and a rotating shaft 17 for moving, respectively. Then a multi spindle gear head 10 is moved near a work and various types of holes are drilled in specified portions of the work. When the type of work to be machined is altered, a hydraulic cylinder 44 is driven to withdraw a locate pin 43 from a sleeve 41. Then, when a hydraulic cylinder 34 is driven, an eccentric cylinder 30 is rotated by 180 deg.. Accordingly, the sleeve 42 located in front of the locate pin 43 drives the hydraulic cylinder 44 in reverse direction. Thus the rotating position of the eccentric cylinder 30 is set in position and the eccentric cylinder 30 is connected firmly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multi-axis gearhead for drilling holes in multiple locations on one workpiece.

(Prior art) For example, when drilling holes in multiple locations on a workpiece such as an automobile engine cylinder block, a multi-axis gear head, also known as a machining head, is used to drill holes in each of the multiple rotating shafts. Machining tools such as drills and reamers are attached.

In order to process a plurality of types of workpieces using the same multi-axis gearhead, the position of the processing tool must be changed in accordance with the workpieces, since the machined parts may differ depending on the type of workpiece.

Conventionally, one multi-axis gearhead can only process one type of workpiece, so in order to process different workpieces, you can either install multiple multi-axis gearheads of different types or use one stage. A plurality of multi-shaft gear heads are provided in the machine, and the multi-shaft gear head can be replaced with a predetermined one according to the workpiece.

(Problems to be Solved by the Invention) However, in the former method, it is necessary to increase the space occupied by the device, and in the latter method, there is a problem that the operating rate of the device is low.

Japanese Unexamined Patent Publication No. 60-20808 discloses a technique in which a plurality of workpieces are machined using two multi-axis gear heads. In this case, the moving shaft on which the processing tool is attached is slidable in the radial direction, and the drive shaft that rotates this moving shaft and the moving shaft are connected by a telescopic joint, and the moving shaft is moved. This is intended for cases where the stroke to be used is long. In a structure where the moving shaft slides in this way, if the load acting on the tool is large and there is a clearance between the moving shaft and the member that holds it, the moving shaft will vibrate and cause chatter. may occur. In order to suppress the vibrations of the moving shaft, attempts have been made to attach a clamping sleeve to the moving shaft and operate this clamping sleeve using hydraulic pressure, and to remove the clearance and clamp by elastic deformation of the sleeve. , this makes the device large and expensive.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a multi-axis gear that can change the position of a processing tool with a simple operation and can perform processing with high precision even when a large load is applied to the processing tool. The purpose is to provide the head.

(Means for Solving the Problems) To achieve the above object, the present invention is a multi-axis gear head that includes processing tools at the tips of a plurality of rotating shafts provided in the processing head and processes a workpiece with the processing tools. In,
An eccentric cylinder having a fitting hole at a position eccentric to the central axis of rotation is rotatably mounted on the head main body, and at least one rotation shaft among the plurality of rotation shafts is rotatably held within the eccentric cylinder. , a multi-shaft in which a rotating means for rotating the eccentric cylinder is connected to the eccentric cylinder, and a locating pin for positioning the eccentric cylinder at a predetermined rotational position and locking the eccentric cylinder is attached to the head main body so as to be movable forward and backward; It's a gear head.

(Function) The rotating shaft rotatably mounted within the eccentric cylinder is connected to a rotating means such as a motor for rotation. A processing tool for counterboring or drilling the workpiece is attached to the tip of the rotating shaft. Therefore, by rotating the eccentric cylinder,
The rotating shaft is shifted by a predetermined position in the radial direction, and the position of the rotating shaft is moved. A locate pin is fitted into the eccentric cylinder when the eccentric cylinder is at a predetermined rotation angle, and by fitting the locate pin, the eccentric cylinder is positioned and the eccentric cylinder is firmly fastened. It turns out.

(Example) Hereinafter, the present invention will be described in detail based on an example of the present invention illustrated in the drawings.

FIG. 1 is a diagram showing the surface of a multi-axis gearhead 10 of the present invention. This multi-axis gear head 10 is installed adjacent to a conveyance line that conveys a workpiece, and is movable toward the workpiece. It has become.

This multi-axis gear head 10 is provided with a first machining head 11 and a second machining head 12, and each head 11.12 has a counter (not shown) for performing counterboring, hole drilling, etc. Five processing tools are installed symmetrically.

Four rotating shafts 13 to 16 that do not move in the radial direction are rotatably mounted on the first machining rod 11, and a moving rotating shaft 17 that moves in the radial direction is also rotatably mounted. There is. Similarly, a total of five rotating shafts 13a to 17a are rotatably mounted on the second processing head 12.

FIG. 2 shows the respective rotating shafts 13 to 16 provided in the first processing head 11 shown in FIG. 1 and the rotating shaft 1 for movement.
7 is a sectional view showing the rotation mechanism of multi-shaft gearhead 1.
0 is a drive shaft 2 that is connected to a motor (not shown) and rotates.
0 is set.

A gear 21 fixed to the drive shaft 20 meshes with a gear 23 fixed to a support shaft 22 rotatably provided on the multi-shaft gearhead 10. A gear 24 is fixed to the support shaft 22, and this gear 24 meshes with a gear 26 fixed to another support shaft 25 rotatably provided on the multi-axis head 10. A gear 27 fixed to the support shaft 25 meshes with a gear 28 fixed to the rotating shaft 14, and the rotating shaft 14 is rotationally driven by the drive shaft 20. A gear 28 fixed to another rotating shaft 13 meshes with the gear 27 via an idle gear (not shown), and this rotating shaft 13 is also driven by the drive shaft 20. the other 2
The rotation of the drive shaft 20 is transmitted to the two rotating shafts 15 and 16 through similar meshing of gears.

An eccentric cylinder 30 is rotatably mounted on the multi-shaft gearhead 10, and a fitting hole 31 is provided at a position eccentric by a stroke e with respect to the rotation center 01 of the eccentric cylinder 30, as shown in FIG. A rotary shaft 17 for movement is rotatably fitted into the fitting hole 31 with a predetermined clearance.

A gear 32 fixed to the end of the rotating shaft 17 is connected to a gear 3 of a support shaft 25 via an idle gear (not shown).
3, it is rotated by the drive shaft 20.

A gear 35 is fixed to the main shaft of a hydraulic motor 34 attached to the multi-axis gear head 10 forming the head body, and this gear 35 meshes with a gear portion 36 formed on the eccentric cylinder 30. Therefore, when the hydraulic motor 34 rotates the eccentric cylinder 30 by 180' from the position shown by the solid line in FIG. I will do it. As a result, the rotation axis 1 can be adjusted according to the type of workpiece.
The position of 7 can be changed.

In order to fasten the eccentric cylinder 30 to the position shown by the solid line and the position shown by the chain double-dashed line in FIG. Sleeves 41 and 42 communicating with the through hole formed in this bushing 40 are incorporated into the eccentric cylinder 30 with a phase difference of 180' from each other. A locating pin 43 that enters a tapered locating hole formed in each sleeve 41, 42 is reciprocated by a hydraulic cylinder 44. In order to detect the forward limit position and backward limit position of the locate pin 43 by the hydraulic cylinder 44, two dogs 45 and 46 are attached to the rod 43a integrated with the locate pin 43.
Limit switches 47, 48 engaged with 5, 46 are each mounted on the base 49 as shown in FIG.

2 to 4 respectively show the internal structure of the first machining head 11 of the two machining heads 11 and 12 provided in the multi-axis gear head 10, but the internal structure of the second machining head 12 is also approximately the same. It is the same.

To process a workpiece using the multi-axis gear head 1o described above, by rotating the drive shaft 20 with a motor (not shown), the multi-axis gear head 1o is attached to the tip of each of the rotating shafts 13 to 16 and the moving rotating shaft 17. Rotate the processing tool. By bringing the multi-axis gear head 10 close to the workpiece in this state, various types of hole machining such as drilling, reaming, or counterboring are performed at predetermined locations on the workpiece.

When the type of workpiece to be machined is changed, for example, in order to move the rotation center of the rotary shaft 17 from the position shown by the solid line to the position shown by the two-dot chain line in FIG. 44, the sleeve 41
The locate pin 43 is retracted from the position. By driving the hydraulic motor 34 in this state, the eccentric cylinder 3o is moved by 180 degrees.
Rotate 6 times. As a result, the sleeve 42 is located in front of the locating pin 43, and in that state, the hydraulic cylinder 44
drive in the opposite direction. In this way, locate pin 4
3 enters into the sleeve 42, and the bush 40 comes into close contact with the outer peripheral surface of the eccentric cylinder 30. Therefore, the rotational position of the eccentric tube 30 is determined by the locating pin 43, and the eccentric tube 30 is firmly fastened.
When processing a workpiece with the processing tool attached to the tip of the moving shaft 17, the moving shaft 17 does not vibrate, and chatter is prevented from occurring.

(Effects of the Invention) As described above, according to the present invention, at least one rotary shaft in a multi-shaft gearhead, which is provided with a large number of rotary shafts to which processing tools are attached, is arranged in an eccentric cylinder. Since the rotation center position of the rotary shaft is changed by the rotation of the eccentric cylinder, a single device can process a plurality of types of workpieces with a simple structure. In addition, the locating pin positions the eccentric cylinder and also allows the eccentric cylinder to be fastened.The rotating shaft is firmly supported by the eccentric cylinder, preventing chatter during machining, and ensuring high-quality machining. can be done.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the surface of a multi-axis gearhead according to an embodiment of the present invention, FIG. 2 is a sectional view showing the internal structure of the first machining head shown in FIG. 1, and FIG. A sectional view showing the eccentric cylinder shown in FIG. 2, and FIG.
It is an arrow view along the IV line. 11.12... Processing head, 17... Rotating shaft, 20
... Drive shaft, 30 ... Eccentric cylinder, 43 ... Locate pin. Patent applicant Nissan Motor Co., Ltd. agent Patent attorney 8 1) Mikio (and 1 other person) Figure 3 30 e

Claims (1)

[Claims] In a multi-axis gearhead that is equipped with processing tools at the tips of a plurality of rotating shafts provided in the processing head and processes a workpiece using the processing tools, an eccentric cylinder having a fitting hole at an eccentric position with respect to the rotation center axis is used. Rotatably attached to the head body,
At least one rotating shaft of the plurality of rotating shafts is rotatably held in the eccentric cylinder, a rotating means for rotating the eccentric cylinder is connected to the eccentric cylinder, and the eccentric cylinder is positioned at a predetermined rotational position. At the same time, a locating pin for locking the eccentric cylinder is attached to the head body so as to be movable forward and backward.