JPH0230824B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a grinding machine for grinding a disc brake rotor.

(Prior art and its problems) In recent years, with the rationalization of production systems typified by so-called FMS, grinding machines for disc brake rotors also have to continuously handle different types of disc brake rotors that are conveyed in a mixed manner. Sequential grinding is desired.

However, with conventional grinding machines of this type, it is necessary to manually adjust the holding position of the workpiece and the forward/backward position of the grinding wheel each time the type of disc brake rotor changes, making it unsuitable for the streamlined production system described above. There is a problem.

(Objective of the Invention) An object of the present invention is to provide a grinding machine for disc brake rotors that can continuously and sequentially grind different types of disc brake rotors that are conveyed in a mixed manner.

(Structure of the Invention) (1) Technical Means The present invention provides a disc brake that has different outer diameter dimensions (K), overall width dimensions (L), and disc part thickness dimensions (T) for each type transported from a previous process. It has a loading section that guides the rotor as a workpiece, a worktable that holds and rotates the workpiece from the loading section at a predetermined grinding position, and a grindstone moving section that moves the grinding wheel forward and backward with respect to the grinding surface of the workpiece. In a grinding machine for a disc brake rotor, the loading section is provided with a measuring mechanism that measures the dimensions of each part of the workpiece and sends out the measurement results as a signal, and the measuring mechanism is provided with a contact at its tip that contacts each part of the workpiece. A cylinder for measuring the dimension (Kr) corresponding to the outer diameter dimension (K), a cylinder for measuring the dimension (Tr) corresponding to the above-mentioned thickness dimension (T), and a cylinder for measuring the dimension (Lr) corresponding to the above-mentioned total width dimension (L). A cylinder is provided, a work table drive mechanism is provided on the work table to adjust the grinding position, a work holding mechanism capable of holding different types of work is provided on the work table, and the type of the work is determined based on a signal from the measuring mechanism. At the same time, the work table drive mechanism, the grindstone moving unit, and the work holding mechanism are provided with a signal processing device that sends a position adjustment signal based on the determination result of the work type, and the work table drive mechanism adjusts the position adjustment signal for each work type based on the position adjustment signal. The grindstone moving part is formed so that the grindstone is placed on standby at a different grindstone standby position for each type of work based on a position adjustment signal, and the workpiece is held at a different grindstone standby position based on a position adjustment signal. A mechanism for a disc brake rotor, characterized in that the mechanism is formed to control the moving distance of a holder for holding a workpiece in order to maintain the distance (a) from the center line to one grinding surface at a predetermined dimension. It is a grinding machine.

(2) Effect Based on the signal from the measurement mechanism, the signal processing device determines the type of workpiece, and the work table drive mechanism, grinding wheel moving mechanism, and workpiece holding mechanism are driven by the position adjustment signal from the signal processing device, and the different Continuously process different types of workpieces.

(Example) In FIGS. 1 and 2 showing the case where the present invention is applied to a double-headed grinding machine for a disc brake rotor, 10 is a work loading part, 12 is a work table, 14 is a grindstone moving part, and D is a An electric control panel has a signal processing device C, and F is a hydraulic unit.

The loading section 10 includes a supply chute 16 that guides W to the work table 12, which will be described in detail later.
An escape 18 that regulates the guidance of the workpiece W, a hydraulic cylinder 20 for driving the escapement 18, and a workpiece W.
It is composed of a measuring mechanism 22 and the like that determines the type of. 17 is a discharge chute for discharging the workpiece W after processing.

As shown in FIG. 3, the workpiece W has a boss portion 24, a disk portion 26, etc., and the dimensions of each portion such as L, T, and K vary depending on the vehicle model. Note that the dimensions D, M, and N of each part of the workpiece W differ depending on the type of the workpiece W, but these dimensions D, M, and N are determined by the combination of the dimensions L, T, and K described above. A hole 25a is formed in the boss portion 24. 27a of the disk portion 26 is a grinding surface.

As shown in FIG. 4, the measuring mechanism 22 for measuring the dimensions of each part of the workpiece W includes a hydraulic cylinder 23a for measuring the K dimension, a hydraulic cylinder 23b for measuring the T dimension, and a hydraulic cylinder 23c for measuring the L dimension. It has a function of pressing the probe 23d of each cylinder against the measurement surface of the workpiece W, converting the extension length of each cylinder into pulses with the encoder E, and outputting the measurement results to a signal processing device, which will be described in detail later. The workpiece W is guided by a groove-shaped supply chute 16 and rolls toward a workpiece pocket 30 located at the right end in FIG. The work pocket 30 is equipped with a hydraulic cylinder 31a equipped with an encoder E.

In FIG. 4, 32 is an escape that restricts the rolling of the workpiece W. The escape 32 regulates the rolling of the work W at a predetermined timing with a hydraulic cylinder 33a that expands and contracts in response to an output signal from the signal processing device, and transports the work W one by one into the work pocket 3.
It has the function of supplying 0.

Similarly, in FIG. 4, 40 is the work table 12.
It is a bed that slidably holds the The work table 12 is slid by a hydraulic cylinder 13a, and its sliding end position is regulated by a stopper 13b and a rotation stopper 13c. The rotation stopper 13c is rotated by a motor 13d, and the sliding end position is changed depending on the size of the projection at the rotational position. In the figure, E is an absolute value output type encoder that measures the amount of rotation of the motor 13d. These constitute a work table moving mechanism.

The arm 42 of the work table 12 extends diagonally upward, and the tip of the arm 42 has a
A clamp shaft 44 is provided so as to be slidable only in the axial direction. A hydraulic cylinder 45a is connected to the left end of the clamp shaft 44, and the entire clamp shaft 44 is slid in the axial direction by the hydraulic cylinder 45a. 45b is a motor for switching the clamp position, and E is an encoder. These constitute a grindstone moving mechanism.

A main clamp arm 46 constituting a part of the work holding mechanism is fixed to the right end of the clamp shaft 44, and a holder 48 is provided at the tip of the main clamp arm 46.

The holder 48 is rotatably driven by a hydraulic motor 50, and is driven by hydraulic cylinders 49a, 49.
b has a mechanism for selecting the first stage projection 49c, second stage projection 49d, and third stage projection 49e of the holder 48.

An auxiliary clamp arm 52 faces the holder 48.
The auxiliary clamp arm 52 is connected to a sliding shaft 54 passing through the clamp shaft 44. The sliding shaft 54 is driven in the axial direction by a hydraulic cylinder 55a.

The signal processing device C that controls the operations of the work table 12, the grindstone moving unit 14, etc. based on the signals from the measuring mechanism 22 has a program that controls each process in the order shown in FIGS. 5 and 5f. It is set. Note that in FIGS. 5 and 5f, the points X are continuous, and the * mark indicates repetition.

Next, the effect will be explained. When the process starts in step S1 of FIG. 5, the dimensions of each part of the workpiece W are measured by the measuring mechanism 22 in steps S2 to S4 (see FIG. 5a), and the measurement signal is input to the signal processing device C. Ru. When the type of workpiece W is determined by the signal processing device C, the workpiece pocket 30 is raised as shown in FIG.
Supply only one to 0.

When the workpiece W is completely clamped by the worktable 12 in step S6 (Fig. 5b,
(see Figures c and 5d), the work table 12 moves forward as shown in Figure 6b (Figure 5e), and in-feed grinding by the grindstone G begins in step S7.

Furthermore, in step S8, the grinding wheel G separates from the workpiece W.
When the workpiece W is moved backward in step S9, the workpiece pocket 30 rises and the workpiece W is unclamped from the worktable 12, as shown in FIG. 6c.
accept. When the workpiece pocket 30 descends from this state, the workpiece W is discharged from the discharge chute 17, as shown in FIG. 6d.

The operation of the entire device will be explained in detail for each part as follows.

First, when the process is started in step S1 in FIG. 5, the work W held in the escape 32 and having already undergone work selection and measurement is rolled into the prepared work pocket 30.

In addition, in FIG. 4, the workpiece W held in the escape 32 and the workpiece W at the sorting measurement position are shown.
Although the illustration shows that there are two workpieces W, this shows that a single workpiece W is moving.

Next, in step S2', in response to a work clamp command from the signal processing device C, first the clamp arm 46 moves forward, then the clamp arm 52 moves forward, and the work W is placed at a predetermined position on the table 12. Clamping is completed at , and the work pocket 30 is lowered.

During this time, in step S4', both grindstone drive units 14, whose main shafts are rotating, rapidly approach the workpiece W, which is being rotated between the grindstone drive units 14, by high-speed feeding from the initial position, and begin the grinding process. At the same time, the operation of the grindstone drive unit 14 is switched to low-speed infeed, advances to a predetermined position, stops, and enters the spark-out process.

After a predetermined period of time has elapsed, both grindstone drive units 14
moves to the retirement process, returns to the original initial position at high speed, and stops.

During the retirement process, the table 12 is moved back and returned to the predetermined loading position in step S5', and then the workpiece pocket 30 is raised and the clamp arms 46 and 52 are moved back and unclamped or released. Work W
is accommodated in the work pocket 30.

Next, in step S6', the work pocket 30 supporting the work W is lowered to a predetermined position and the work W is transferred to the ejection chute 17, after which the work pocket 30 is raised to a predetermined position to be processed next. This means waiting for the workpiece W to be transported.

On the other hand, in the workpiece discrimination process, the workpiece W for the next process is held in the escape 32 at step S4', as shown in FIG. Dimensions corresponding to
Tr, Lr, and Kr are sequentially measured, and the measurement signals are input to a signal processing device C to determine the type of workpiece W.

From this discrimination result, first calculate the value of (K-N)/2 shown in Fig. 3 for the workpiece W, that is, the dimension at which the workpiece W should be inserted between the two grindstones, and then proceed to the step.
When the table 12 is retracted at S5', a signal is sent to the electric control panel D, and the motor 1 shown in FIG.
3d is rotated and compared with the signal generated by the attached encoder E, the rotation stopper 13c is driven so as to obtain the required thrust amount.

Next, the case where it is necessary to change the clamp position at step S6' will be explained with reference to FIG. 5c.

In order to manage the grinding dimensions, it is desirable to maintain a constant distance from the machine center line to the grinding surface of the left grindstone, as shown in (A) in the figure. Furthermore, if the dimension (b) in the figure is set equal to the stroke amount of the hydraulic cylinder 45a, the flange depth (c) changes depending on the type of workpiece W, so the standby position of the holder 48 is from the machine center line. The position must correspond to the dimension (d), that is, the value of (a) + (b) - (c).

For this reason, the signal processing device C calculates the (d) dimensions unique to the type of workpiece W determined, sends a signal to the electric control panel D to rotate the motor 45b, and compares it with the signal generated by the encoder E attached to the motor 45b. to move the holder 48 to an appropriate position.

Next, the "inro" is fitted into the reference hole 25a (Fig. 3) of the workpiece W mounted on the holder 48.
The case where the dimensions of the section are changed into three types is shown. The dimensions of this “inro” part are 49c, 49d, and 49e.
There are several types, and the signal processing device C is the “inro” section 4.
If 9c is selected, no signal is output to the electric control panel D, but if the "inflow" section 49d is selected, a signal is output to send pressure oil to the hydraulic cylinder 49a, and the "inflow" section 49e is output. If selected, hydraulic cylinder 49a and hydraulic cylinder 49b
Outputs a signal to supply pressure oil to.

In this way, the desired "inro" protrusion can be exposed from the workpiece contacting surface of the holder 48 and can be used as a reference for clamping the workpiece. The types of "inro" parts can be further increased by combining the number of hydraulic cylinders and the stroke amount.

Furthermore, the height at which the workpiece pocket 30 rises must be changed depending on the workpiece. Since the support position of the pocket is the outer diameter part of dimension M shown in Fig. 3,
In order to keep the clamp center constant, the stroke of the hydraulic cylinder 31a must be selected depending on the type of workpiece.

Therefore, after determining the type of workpiece W, the signal processing device C outputs a signal to the electric control panel D to control the stroke of the hydraulic cylinder 31a with the attached encoder E.

Figure 5d shows the workpiece W being clamped by the clamp arms 46, 5.
2, it is stuck between both grindstones, and G in the figure shows the grinding surface of the grindstone before a feed command is input to the grindstone shaft.

As explained in Figure 5c, the distance (E) between the grinding surface of the left whetstone and the machine center line is set so that the dimension (B) is constant, so it is a constant dimension considered based on the grinding conditions. It is set to the value.

However, for the grinding surface of the right whetstone, the most appropriate waiting distance (f) will change if the machining time is taken into consideration depending on the T dimension indicating the part thickness of the workpiece W.

Therefore, after determining the type of workpiece W, the signal processing device C calculates the waiting distance (F) for the grinding surface of the right grindstone, and controls the distance (F) through the electric control panel D.

Further, the signal processing device C receives a signal from a separate dimension measuring device (not shown), checks the degree of wear of the grindstone, calculates the amount into the distances (E) and (F), and performs the retirement process of the grindstone shaft. It also performs controls such as adjusting the amount of grinding, determining the necessity of inserting a dressing process, moving to the dressing position, and returning the newly ground surface to a predetermined standby position after dressing.

(Effects of the Invention) As explained above, the disc brake rotor grinding machine according to the present invention has a loading section that guides the disc brake rotor transported from the previous process as a workpiece, and a loading section that grinds the workpiece from the loading section in a predetermined manner. A grinding machine for a disc brake rotor, which has a work table that is held in position and driven to rotate, and a grindstone moving part that moves a grindstone forward and backward with respect to the grinding surface of the workpiece,
The loading section is provided with a measuring mechanism that measures the dimensions of each part of the workpiece and sends the measurement results as a signal, the worktable is provided with a worktable drive mechanism that adjusts the grinding position, and the type of workpiece is determined by the signal from the measuring mechanism. Since the present invention is equipped with a signal processing device that determines the type of the workpiece and sends a position adjustment signal to the work table drive mechanism and the grindstone moving unit based on the result of the determination of the work type, the following effects are achieved.

The measurement mechanism 22 measures the dimensions of each part of different types of workpieces W that are mixedly conveyed from the loading section 10, and the measurement signal from the measurement mechanism 22 is input to the signal processing device C.
The type of workpiece W from the signal processing device C is determined.
Based on the determination results, the work table 12 and the grindstone moving unit 14 can be controlled to perform grinding that matches the type of workpiece W, making it ideal for modern streamlined production systems such as FMS. We can provide grinding machines for rotors. In particular, the present invention is a grinding machine for efficiently machining disc brake rotors that have different outer diameter (K), overall width (L), and disc thickness (T) for each type. A cylinder for measuring the dimension (Kr) corresponding to the outer diameter dimension (K) equipped with a contactor that contacts each part at the tip, a cylinder for measuring the dimension (Tr) corresponding to the thickness dimension (T), and a cylinder for measuring the dimension (Tr) corresponding to the above-mentioned thickness dimension (T), and the above-mentioned total width dimension ( Since we have provided a cylinder for measuring the dimension (Lr) corresponding to L),
Dimensions of each part of the disc brake rotor unique to each type using the three cylinders of the measurement mechanism (Kr, Tr, Lr)
It is possible to accurately and efficiently measure the dimensions for determining the type of disc brake rotor.

Since the work table drive mechanism is configured to feed the workpiece between the grinding wheels by a predetermined thrust size that varies depending on the type of workpiece based on the position adjustment signal,
The workpiece can be fed between the grinding wheels by the optimum thrust size for each type of disc brake rotor.
Even if the type of work changes, the plunge dimension can be automatically controlled.

The grindstone moving part is configured so that the grindstone waits at a different grindstone standby position for each type of workpiece based on the position adjustment signal, so the grindstone can be moved to the optimum standby position in response to changes in the thickness (T) of the disc brake rotor. can be made to wait.

The workpiece holding mechanism is configured to control the movement distance of the workpiece holding holder in order to maintain the distance (a) from the centerline to one of the grinding surfaces at a predetermined dimension. The distance to one of the surfaces can be maintained constant, and grinding can be performed under good grinding conditions.

Therefore, the processing efficiency can be improved when grinding different types of disc brake rotors together.

(Another Embodiment) (1) The present invention is applicable not only to the so-called reciprocating type loading section 10 as described above, but also to a so-called index type loading device as shown in FIG.

[Brief explanation of drawings]

Fig. 1 is a plan view of a grinding machine for disc brake rotors to which the present invention is applied, Fig. 2 is a view taken in the direction of the arrow in Fig. 1, Fig. 3 is a longitudinal cross-sectional view of the disc brake rotor, and Fig. 4 is a loading section. 5 and 5f are flowcharts showing signal processing performed by the signal processing device; FIG. 5a is a structural schematic diagram showing the measurement mechanism; and FIGS. 5b to 5d. The figure is a structural diagram showing the clamping operation of the work table, Figure 5e is a structural diagram showing the forward position of the work table, and Figures 6a to 6.
Fig. d is a structural diagram showing the processing steps of the workpiece, and Fig. 7 is a structural diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Loading part, 12... Work table, 14... Grindstone moving part, 16... Supply chute, 22... Measuring mechanism, 44... Clamp shaft, C... Signal processing device.

Claims (1)

[Claims] 1 Outer diameter dimensions for each type transported from the previous process
(K), a loading section that guides a disc brake rotor with different overall width dimensions (L), and disc thickness dimensions (T) as a workpiece, and a workpiece that holds the workpiece from the loading section at a predetermined grinding position and drives it rotationally. In a grinding machine for a disc brake rotor, which has a table and a grindstone moving part that moves the grinding wheel forward and backward relative to the grinding surface of the workpiece, the dimensions of each part of the workpiece are measured to the loading part and the measurement results are sent as a signal. A measuring mechanism is installed to
The measurement mechanism includes a cylinder for measuring the dimension (Kr) corresponding to the outer diameter dimension (K) and a cylinder for measuring the dimension (Tr) corresponding to the thickness dimension (T), which is equipped with a contact at the tip that contacts each part of the workpiece. and a cylinder for measuring a dimension (Lr) corresponding to the overall width dimension (L), a work table drive mechanism for adjusting the grinding position is provided on the work table, and the work table can hold different types of workpieces. A holding mechanism is provided to determine the type of workpiece based on the signal from the measuring mechanism, and a signal processing device is provided to send a position adjustment signal to the worktable drive mechanism, grindstone moving unit, and workpiece holding mechanism based on the determination result of the workpiece type. , the work table drive mechanism is configured to feed the workpiece between the grindstones by a predetermined plunge dimension that varies depending on the type of workpiece based on the position adjustment signal, and the grindstone moving section differs depending on the type of workpiece based on the position adjustment signal. The grindstone is formed so as to wait at the grindstone standby position, and the workpiece holding mechanism controls the moving distance of the holder for holding the workpiece in order to maintain the distance (a) from the center line to one of the grinding surfaces at a predetermined dimension. A grinding machine for disc brake rotors, characterized by being formed as follows.