JPH05104383A - Linking type reciprocation mechanism for machine tool - Google Patents

Abstract

PURPOSE:To omit a long linear sliding guide surface and a direct acting bearing by providing at least a pair of linking mechanisms comprising Pauslier type strict linear movement mechanism, by connecting the moving pins of both of the linking mechanisms to a linear moving board of a machine tool, and by connecting a driving mechanism of the linear moving board to the linear moving board. CONSTITUTION:At least a pair of linking mechanisms X1 comprising Pauslier type strict linear movement mechanism are provided. The front ends of fourth and sixth links 4, 6 protruded in the reverse direction to the side in which a first fixed pin O1 exists from first and second moving pins B, D, in both linking mechanism X2, are connected to a fourth moving pin A moving on a line. The fourth moving pin A is connected to linear moving boards 23, 40 of a working machine, while a moving mechanism 30 of the linear moving board is connected to the linear moving boards 23, 40 or to the linking mechanism X1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel head for giving a reciprocating linear motion to a grindstone of an inner surface grinding machine, and a work (work).
TECHNICAL FIELD The present invention relates to a link type reciprocating mechanism of a machine tool suitable for application to a spindle head or the like that gives a linear cutting motion to a machine.

[0002]

2. Description of the Related Art As a reciprocating linear motion guide mechanism in a conventional machine tool, a slide guide surface or a linear motion bearing is generally used. However, in the case of the sliding guide surface, when the sliding component is worn, it is necessary to re-polish both the long sliding face and the component sliding on it, or to replace it with a new component, which is likely to be costly. Also, in order to prevent cutting fluid, chips, etc. from entering the sliding surface, a telescopic cover or the like has been used, but it cannot be said to be perfect. This also applies to a guide mechanism using a linear motion bearing.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a link type reciprocating mechanism for a machine tool which does not require a long linear slide guide surface or a linear motion bearing.

[0004]

According to the present invention, the base end portions of the first and second links 1 and 2 having the same length are connected to the first fixed pin O1, and the first and second movable pins B and D at the respective tips are respectively connected. A pair of equal length third, fourth links 3, 4 and fifth, sixth links 5, 6
Connect the base ends of the first and second moving pins B and D
The third and fifth links 3, which protrude to the side where the fixing pin O1 is,
5 is connected via the third moving pin C and the base end portion of the seventh link 7 is connected thereto, and the leading end of the seventh link 7 is located at the center of the first fixed pin O1 and the third moving pin C. The tips of the fourth and sixth links 4 and 6 which are connected to the second fixed pin O2 and project in the direction opposite to the side where the first fixed pin O1 is located from the first and second movable pins B and D are the fourth movable pins. At least one pair of link mechanisms connected to A so that the fourth moving pin A moves along a straight line is provided, and the fourth moving pin A of both link mechanisms is connected to the linear moving base of the machine tool to move linearly. It is a link type reciprocating mechanism of a machine tool in which a drive mechanism of a linear moving table is connected to a table or a link mechanism.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 3 and 4 are schematic views of the link mechanisms X1 and X2 used in the present invention, which are already known as a poisserie-type strict linear motion mechanism. In FIG. 3, O1 and O2 are first and second parallel (perpendicular to the paper surface)
Fixed pin, position unchanged. Reference numerals 1 and 2 are first and second links having the same length, and the base end portion (the lower end portion in the figure) is connected to the first fixing pin O1 and the respective tip ends are the first and second movements parallel to the pin O1. It is connected to pins B and D. The base ends (left ends in the drawing) of the third and fourth links 3 and 4 having the same length are connected to the first moving pin B, and the second moving pin D has the same length as the links 3 and 4. The base ends of the fifth and sixth links 5 and 6 (the right end in the figure) are connected to each other. The third and fifth links 3 and 5 project obliquely downward (to the side where the first fixed pin O1 is located) from the first and second moving pins B and D, and via the third moving pin C parallel to the pin O1. It is connected to the base end of the seventh link 7. The tip (lower end in the figure) of the seventh link 7 has a first fixing pin O1 and a second fixing pin O2 at the center of the third moving pin C.
Connected to. The fourth and sixth links 4, 6 are the first and second
It projects diagonally upward from the moving pins B and D, and the tip is pin O
1, 4 is connected to the fourth moving pin A parallel to O2. The positional relationship of each pin is O1B = O1D, AB = BC = CD = D
A and O2C = 1/2 · O1C. When force is applied to the link mechanism from the side, the fourth moving pin A moves straight
Move on. The same applies to FIG.

FIGS. 1 and 2 show a case where the link mechanism X1 of FIG. 3 is applied to the inner surface grinding machine 11, and the same reference numerals as those in FIG. 3 are corresponding parts. In the right half of FIG. 1, four link mechanisms X1 of FIG. 3 are adopted as the grindstone reciprocating mechanism 13 for reciprocating the grindstone 12 on the straight line 10a parallel to the straight line 10, and two of them are the front two. I can see it. The left half of FIG. 1 is a work reciprocating mechanism 15 for reciprocating the work 14 in a direction perpendicular to the plane of the drawing (on the straight line 10b of FIG. 2), and has four link mechanisms X1 of FIG. 3 and a common bed. It is attached to a bracket 17 on 16. Figure 1
The bracket 18 of the grindstone reciprocating mechanism 13 on the right half has the same shape as the bracket 17, and is fixed on the bed 16.
The first and second links 1 and 2 are supported by ball bearings 20 at both ends of a first fixing pin O1 supported by a pair of vertical walls 19. 21 is an oil seal with a lip. Both ends of the second fixed pin O2 are supported by a pair of vertical walls 19, a common seventh link 7 is supported in the middle by a bearing 20, and a third moving pin C is provided at the upper end of the seventh link 7. Is supported via bearings 20, and the third and fifth links 3 and 5 are supported on both ends of the third moving pin C via bearings 20. First,
The upper ends of the third links 1 and 3 are supported by one end of the common first moving pin B, and the lower end of the fourth link 4 is located on the first moving pin B between the first and third links 1 and 3. The section is supported. The upper ends of the second and fifth links 2 and 5 are also supported by one end of the common second moving pin D, and the sixth link is located on the second moving pin D between the second and fifth links 2 and 5. The lower end of 6 is supported. The upper ends of the fourth and sixth links 4 and 6 are supported by one end of the common fourth moving pin A, and the intermediate portion of the fourth moving pin A is formed in the hole of the protrusion 24 protruding downward from the grindstone base 23. Fitted and fixed. See Figure 1 (first
The moving straight lines of the two fourth moving pins A of the grindstone reciprocating mechanism 13 are aligned with the straight line 10 (as viewed in the direction of the fixed pin O1). However, the moving straight lines of both the fourth moving pins A may be parallel. The link mechanism X1 may be a pair as long as sufficient rigidity is obtained.

The wheel head 23 is provided with a ball circulation type nut 25 on the side (the same position as the nut 25 at the left end of the machine tool reciprocating mechanism 15 in the left half of FIG. 1) which does not interfere with the four link mechanisms X1. Both ends of the ball screw 26 screwed to the nut 25 are supported by bearings 28 in a bearing box 27, and the bearing box 27 is fixed to a portion integrated with the bed 16. One end of the ball screw 26 is provided with a servo motor through a coupling 29.
The servo motor 30 is attached to the bed 16 and an integral part of the bed 16. A wheel head 31 and a motor 32 are mounted on the grindstone base 23, and the wheel head 31
Pulley 34 and motor 32 fixed to the whetstone base 33
The pulley 35 is connected by a belt 36. 37
Is a cover, which is fixed to the grindstone base 23 by bolts 38 so that the spray of the grinding fluid applied when grinding the workpiece 14 with the grindstone 12 does not splash on the link mechanism X1.

The work reciprocating mechanism 15 has four link mechanisms X1 similar to the right half of FIG. 1 below the headstock 40 and a driving servomotor 41 (FIG. 2) for cutting. The corresponding parts are shown with the same reference numerals. Headstock 4
A spindle head 42 and a motor 43 are mounted on the shaft 0, and a pulley 44 of the spindle head 42 and a pulley 43 of the motor 43 are attached.
45 is connected by a belt 46. 47 is a chuck, 4
8 is a cover to prevent splashes.

When the workpiece 14 is ground by the grindstone 12,
The motor 43 imparts a predetermined low rotation (for example, 500 rpm) to the workpiece 14, and at the same time, the motor 32 imparts a high speed rotation (for example, 15000 rpm) to the grindstone 12.
A rapid feed is applied to the grindstone base 23 by the servomotor 30 to bring the grindstone 12 closer to the workpiece 14, and then the grindstone 12 is gently reciprocated from there, and in that state, the servomotor.
The workpiece 14 is cut by 41 in the direction of the arrow Y in FIG. 2 to grind the inner surface. When a predetermined amount of grinding is completed, the grindstone 12 is retracted. The above operation is performed by a controller (not shown) for the motors 32 and 43 and the servo motor.
This is performed by automatically controlling 30, 41. During work, the grindstone 12 is on a straight line 10a parallel to the straight line 10 of FIG. 1, and the workpiece 14 is a straight line 10b parallel to the straight line 10 of FIG.
Move up. The splash of grinding fluid adheres to the surfaces of the covers 37 and 48 and flows down.

[0010]

As described above, in the present invention, the poislier type strict linear motion mechanism is applied in combination with the linear moving base such as the grindstone head 23 and the headstock 40 of the machine tool.
Even if the rocking part (rotating connection part with the pin) of the link is worn due to long-term use, the initial motion accuracy can be restored by simply replacing an inexpensive bearing such as the ball bearing 20. .. Also, by combining the oil seal 21, it is possible to easily and completely protect against intrusion of cutting fluid, cutting chips, etc., and therefore a large amount of cutting fluid can be applied. As for manufacturing cost, polishing,
Since it is possible to process link parts at the same time without the need for rubbing, a significant cost reduction can be expected. For example, if the second fixing pin O2 is connected to the seventh link 7 by a servo motor so as to give a rotational force, the servo motor can be operated.
It is also possible to omit the counter 30.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional side view when the present invention is applied to an internal grinding machine.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a schematic view showing an example of a Poslier-type strictly linear motion mechanism.

FIG. 4 is a schematic view showing another example of a Poslier-type strictly linear motion mechanism.

[Explanation of symbols]

 1 1st link 2 2nd link 3 3rd link 4 4th link 5 5th link 6 6th link 7 7th link 10 Straight line 23 Grinding stone stand (straight moving stand) 30 Servo motor (driving mechanism) 40 Headstock (straight moving table) 41 Servo motor (driving mechanism) A 4th moving pin B 1st moving pin C 3rd moving pin D 2nd moving pin

Claims (1)

[Claims] 1. A pair of equal ends of the first and second links 1 and 2 are connected to the first fixed pin O1 and are connected to the first and second movable pins B and D respectively. Third and fourth of length
The base ends of the links 3 and 4 and the fifth and sixth links 5 and 6 are connected to each other, and the first fixed pin O1 is connected to the first and second moving pins B and D.
The third and fifth links 3 and 5 projecting toward the side of the third link 7 are connected to each other via the third moving pin C, and the base end of the seventh link 7 is connected thereto. First fixing pin O
4th and 6th links which are connected to the second fixed pin O2 at the center of the 1st and 3rd moving pins C, and which project in the direction opposite to the side where the 1st fixed pin O1 is located from the 1st and 2nd moving pins B and D At least one pair of link mechanisms in which the tip ends of 4 and 6 are connected to the fourth moving pin A so that the fourth moving pin A moves in a straight line are provided, and the fourth moving pin A of both link mechanisms is machine tool. Link type reciprocating mechanism of a machine tool, which is connected to the linear moving base and the driving mechanism of the linear moving base is connected to the linear moving base or the link mechanism.