JPS6236589Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an automatic cutting groove cutting machine for a motor armature, and in particular, an automatic cutting groove cutting machine that regrinds the outer periphery of the commutator part of a motor armature and automatically performs repair cutting of the groove. It is related to cutting machines.

As the motor is used, the performance of the commutator section of the motor armature gradually decreases due to corrosion of the surface, adhesion of carbon, etc. Therefore, it is necessary to carry out repairs at regular intervals. In other words, it is necessary to modify the outer diameter of the commutator part and repair the grooves.

In the conventional inspection and repair line system for motor armatures for vehicles, a grinding machine and a grooving machine were installed separately, and the armature commutator section to be machined was machined at a separate location. Loading and unloading the armatures to and from individual processing machines and transporting them between processing machines requires a lot of labor and time, and there is a drawback that a large amount of floor space is required for installing the processing machines.

This idea was made in consideration of the above,
The purpose of the present invention is to provide an automatic cutting and grooving machine that can efficiently perform grinding and grooving without the drawbacks mentioned above. By installing the tool post and the groove cutting tool post including a detection device and a groove cutting device together,
This allows the machining of the commutator section to be completed by loading the motor armature onto the machine only once.

The invention will be explained below with reference to the illustrated embodiments.

First, to describe the structure, as shown in Figures 1 to 3, the headstock 1 has a box-shaped structure and has two electric motors, a main electric motor 2 and an indexing electric motor 3, which form part of the machine base. It is firmly fastened onto the slide base 4. The main electric motor 2 is held on the cover above the headstock via anti-vibration rubber, and as shown in Fig. 4, drives the main shaft 1a via a V-belt 2a and a gear group 2b. The electromagnetic clutches 5 and 6 are used to switch between high and low speeds, such as 200 and 280 rpm.
It constitutes a high-speed rotation drive mechanism that rotates the seeds.

An indexing motor (pulse motor or DC servo motor) 3 is installed behind the headstock (see Figure 2), and as shown in Figures 4 and 5, a harmonic drive 3a (Figure 5), a worm 7, and a worm wheel are installed. 8 and an electromagnetic clutch 9, a low-speed rotation indexing drive mechanism is constructed that can index the main shaft by applying slow rotation to the main shaft 1a and opening and closing a proximity switch by means of a dog provided at the rear of the main shaft. . However, during groove cutting, which will be described later, groove indexing is performed by detecting grooves not by a dog but by a groove detection device on the tool rest side.

Electromagnetic clutches 5 and 6 are switching mechanisms that switch between the high-speed rotation drive mechanism and the low-speed rotation index drive mechanism.
and electromagnetic clutch 9 are electrically interlocked to prevent damage to motors 1 and 3.

A rotary hydraulic cylinder 10 is provided at the rear end of the main shaft,
Activate the hydraulic chuck 11 at the tip of the main shaft,
The workpiece, ie the motor armature, can be automatically gripped by the chuck 11. The main shaft is also equipped with an electromagnetic brake at the rear to ensure indexing accuracy.

The feed unit has a built-in hydraulic cylinder (not shown) for vertically moving the headstock 1 on the base 4, and is firmly fixed on the bed.
A micro switch is installed on the front side of the feed unit to confirm forward/backward movement and to switch between rapid forward and normal feed.

The tailstock 12 consists of upper and lower parts, the lower tailstock base 12a is firmly fixed on the bed 17, which is a part of the machine base, as shown in FIG. 3, and the upper tailstock 12b ( Fig. 6) has a structure that allows lateral adjustment movement relative to the tailstock base. As shown in FIG. 6, a torque motor 13 is provided at the rear of the tailstock, and is adapted to screw drive a tailstock sleeve 15 having a center 16 through a reduction gear train 14. The stand center 16 is put in and taken out. The geared drive nut for the tailstock sleeve is pushed forward by a spring with a constant load, and after the tailstock center 16 contacts the workpiece, the tailstock is advanced until the set load is reached, and then the tailstock is moved forward until the set load is exceeded. When this happens, the tailstock sleeve stops, the geared drive nut rotates against the spring and moves backward a certain amount, then closes the adjustable micro switch, stopping the electric motor and receiving thrust. There is. This microswitch instructs the headstock 1 to move forward at the same time as the electric motor 13 stops. The tailstock sleeve 15 has a strong built-in center. There is a micro switch on the left side of the tailstock base that selects the type of workpiece, and a dog installed on the holding bracket on the pallet selects the type of armature.

The bed 17 constituting the machine base has a sturdy box-shaped T-shaped structure, and the top surface includes a headstock slide base 4, a tool rest slide base 18a for cutting, a slide base 19a for a tool rest for groove cutting, A tailstock base 12a and a transport device 20 (autoloader) are attached.

The cutting tool rest 18 is roughly divided into a saddle 18b equipped with a DC servo motor controlled by an NC that is included in a general numerical control lathe, a cross slide 18c, a turret tool rest 21, etc.
As is clear from FIGS. 2 and 3, the blade slides on the slide base 18a for the cutting tool rest provided on the bed 17 on the side opposite to the operator with respect to the center of the spindle, and performs the respective predetermined actions. It's summery. The turret tool rest 21 has a hexagonal shape, and a tool holder for mounting a turning tool and a contactor (two types, radial and longitudinal) for a detection device are mounted on each tool mounting surface. Indexing and clamping of each surface is performed by a hydraulic motor, position coder, and hydraulic cylinder.

The groove cutting tool rest 19 is roughly divided into various mechanisms such as tool rest positioning, tool cutting, groove detection, cutting mechanism, and automatic lubrication, and as shown in FIGS. 2 and 3, it is provided on the operator's side with respect to the center of the spindle. is slidably provided on the groove cutting slide base 19a,
It is designed to perform predetermined operations as described below.

A conveyance device 20 is installed between the headstock 1 and the tailstock 12 on the machine stand in a direction perpendicular to their center lines, forming a transfer line.
The conveyance device 20 is mainly composed of a concave rail 20a as shown by the chain line in FIG. 1, and can be divided as shown in FIG. Yes, the rail can be firmly tightened and fixed to the bed. There is a pallet feed hydraulic cylinder inside the rail, and a pallet stopper hydraulic cylinder 20b (11th
), the pallet is positioned by moving the stopper 20c, and the arm 20e is pivoted upward by the action of the pallet lifter hydraulic cylinder 20d (see Fig. 12) located on the underside of the rail, and the stopper 20c is moved.
The pallet is pivoted up about c, and the workpiece is raised between the headstock and tailstock so that it can be installed in the processing position. There are 4 cylinders for pallet feed.
Drives a feeder with several claws to feed two pallets.
The machines can be transported all at once and positioned from the pre-processing station to the main machine and from the main machine to the post-processing station.

To describe the turret in more detail, the saddle slides on the slide base to move in the longitudinal direction, and the cross slide moves on the saddle to move in the radial direction.

The cutting tool post 18 is operated by a DC servo motor 18e (Fig. 7A) installed on the slide base 18a.
The saddle 18 is connected to the saddle 18 via a reduction gear that obtains 0.01/pulse and a ball screw 18d from which the backlash has been removed.
b to move it in the longitudinal direction. Similarly, radial movement is achieved by moving the saddle 18b as shown in FIG. 7B.
0.01/ by the 18f DC servo motor installed in
Cross slide 1 via a 18g ball screw with a reduction gear and a backlash removed to obtain pulse.
8c to move the turret tool rest 21 in the radial direction of the workpiece.

The processing position of the turret tool rest 21 on the workpiece is determined by moving the turret tool rest in the longitudinal and radial directions from a certain reference position, and using the contactor attached to the turret tool rest to position the end (longitudinal) of the commutator part of the workpiece. direction)
The positioning is performed by electric signals in contact with the commutator surface (in the radial direction), and the cutting of the cutting tool is performed by a program in which an appropriate amount is arbitrarily given in the radial direction using the point detected by the contact as the reference position.

As shown in FIG. 8, the groove cutting tool rest 19 also has a saddle 19b having a tool rest 22 on its upper part.
It moves on the groove cutting slide 19a fixed to 7 and is positioned in the longitudinal direction, and the DC servo motor 1
At 9f, the cross slide 19c is moved in the radial direction on the saddle 19b to perform radial positioning, and the positioning is automatically set based on the commutator end position and the machining diameter measured by the cutting tool post 18. .

When the groove cutting tool rest is positioned, this tool rest detects the groove of the commutator. Groove detection is done using the turret 22
(Fig. 8) Two detection tubes 24, 2 provided at the front end
This is performed by an optical detection device 23 equipped with 5, and consists of groove indexing to match the center of the groove and the center of the cutting tool, and torsion correction to make the groove and the cutting tool parallel. Groove indexing is performed using the detection cylinder 24 on the left side of the detection device 23.
The workpiece is rotated using the main shaft 1a, and the workpiece is automatically stopped when the center of the corresponding groove coincides with the center of the detection tube 24, and then the torsion is corrected.

The torsion correction mechanism is located at the top of the swivel base 27.
It consists of a DC motor and a reduction gear box, etc., and the DC motor drives the worm reduction gear and cam.
This is done by raising and lowering the knife, detection tube, etc. at the same time. First, the swivel slide 28 is rotated by the DC motor around the left detection tube 24 that coincides with the groove by indexing, and the other detection tube 25 is moved from the bottom to the top, so that the center of the groove and the center of the detection tube are aligned. If the blade is automatically stopped at a certain point, the cutter can move parallel to the groove, and the torsion has been corrected.
8a (FIG. 9A).

The groove cutting device installed on the groove cutting tool post can be used for groove machining,
It consists of various mechanisms for surface machining and bite indexing, and is provided on the back surface of the swivel slide 28. The groove machining mechanism consists of a deceleration, a cam mechanism, and a sawtooth sliding mechanism inside the electric motor 29a (FIG. 9A) on the vertical slide 29. Machining is performed by moving the cross slide while sliding (vibrating) the sawtooth 31 via the cam by the electric motor. It operates back and forth depending on the program. The surface machining mechanism includes a cutter feed 30 provided on the back side of a vertical slide 29 that holds the groove machining mechanism, and a hydraulic cylinder 30 provided on the rear side surface.
a (Fig. 9A), etc., and machining is performed by moving the chamfering tool 32 parallel to the commutator groove when the hydraulic cylinder is retreating. A limit switch is provided on the underside of the cutter feed 30 and is used for checking and commanding the operation. The tool indexing mechanism is composed of a vertical slide 29 that holds a tool and a hydraulic cylinder installed on the upper surface of the vertical slide 29, and is located in front of the cutter feed 30.
Alternatively, cutting can be performed by positioning either one of the chamfering bits 32 on the center line of the spindle. A set of limit switches is also provided on the right side of the vertical slide 29 and is used for operation confirmation and commands.

The detection tubes 24 and 25 are for detecting and positioning the mica groove of the commutator by appropriately incorporating an optical lens, a prism, a photoelectric conversion element, etc. inside the cylindrical body, and are described in Japanese Utility Model Publication No. 54-31285. Therefore, detailed explanation will be omitted.

The automatic grinding and grooving machine of this invention is constructed and operates as described above, so (1) the grinding turret is mainly used to measure and calculate the uneven wear on the outer periphery of the commutator surface of the motor armature; Determine the appropriate filling amount and perform processing, (2)
After the cutting process, the outer diameter of the commutator surface is measured again, and based on this, the groove cutting tool rest is moved to the cutting position and automatically positioned. Individual torsions of grooves can be detected and automatically corrected, and groove cutting and chamfering can be performed.

According to this invention, the grinding tool rest and the groove cutting tool rest are installed on the same bed, and the commutator surface grinding machine and the groove cutting machine are integrated. There is no need for transportation between machines, and the equipment, time and labor required for this can be omitted. b) The equipment floor area can also be significantly reduced to about half. c) Furthermore, by adding an electrical measuring device, it becomes possible to centrally measure and process the armature, and d) by providing a lifter and a conveyor, automatic conveyance and automatic loading can be performed.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of the electric motor armature automatic grooving machine of this invention, Figure 2 is a plan view taken in the direction of the arrow in Figure 1, and Figure 3 is the arrow in Figure 1. 4 is a developed view showing the spindle drive mechanism in the headstock, and FIG. 5 is a side view as seen in the direction shown in FIG.
FIG. 6 is an explanatory diagram showing the inside of the tailstock, FIGS. 7A and 7B are explanatory diagrams of various mechanisms of the cutting tool rest, and FIG. 8 is a perspective view of the groove cutting tool rest. , 9A, 9B, and 9C are explanatory diagrams of various mechanisms of the groove cutting tool post, and FIG. 10 is a plan view of the conveying device.
FIG. 11 is a partial side view of the stopper, and FIG. 12 is a partial side view of the lifter. 1... Headstock, 1a... Main shaft, 2... Main motor, 3... Index motor, 4... Slide base,
12...Tailstock, 16...Tailstock center, 17...
... bed, 18 ... tool rest for sharpening, 19 ... tool rest for groove cutting, 20 ... conveyance device, 21 ... turret tool rest, 22 ... tool rest, 23 ... optical detection device, 24, 25...detection tube, 27...swivel base, 28...swivel slide, 31...serration, 32...chamfering tool.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A machine tool for repairing and cutting the commutator part of a motor armature, which includes a machine base, a high-speed rotation drive mechanism of a main shaft mounted on the machine base, and a low-speed rotation indexing mechanism. A headstock equipped with a drive mechanism and a switching conversion mechanism for both drive mechanisms, a tailstock, and a workpiece commutator section that is sequentially indexed to a predetermined position by a low-speed rotation indexing drive of the main spindle. A detection device that detects the minimum outer diameter dimension and axial position at each indexing position of a cutting tool rest equipped with a turning device that performs repair turning on the outer periphery of a commutator portion of a workpiece by rotational drive, and a detection device that measures a machining diameter after turning;
a detection device that sequentially indexes a plurality of grooves in a commutator portion of a workpiece by a low-speed rotation indexing drive of the main shaft;
A detection device that detects the torsion of the groove of the workpiece commutator section at the index position and sets the inclination angle of the repair groove tool according to the detected amount, and a workpiece commutator at each index position of the main shaft. A groove cutting tool rest equipped with a groove cutting device for sequentially repairing grooves in the child part, and repair turning of the outer periphery of the commutator part of the motor armature attached to the chuck of the main shaft and measured values of the turned machining diameter An electric motor armature automatic cutting straight groove cutting machine characterized by automatically positioning a groove cutting tool post based on the above and automatically performing repair cutting of a groove in a commutator section. 2. The electric motor armature automatic cutting groove cutting machine according to claim 1, wherein a conveying device is attached to the machine base between the headstock support portion and the tailstock support portion.