KR102842769B1 - Fixing jig for precision machining workpiece - Google Patents

Abstract

The present invention relates to a workpiece fixing jig for precision machining, which is structurally improved so that the positions of the first and second clamp arms can be independently corrected by the first spline clutch, thereby providing versatility in clamping not only workpieces with symmetrical shapes on both sides but also workpieces with asymmetrical shapes, and in particular, the jig comprises a base plate (10), a driving screw (20), a driven screw (30), a first spline clutch (40), a first clamp arm (50), a second clamp arm (60), a first multi-jaw (70), a second multi-jaw (80), and a load bar (90) as its main components, so that workpieces with irregular shapes can be flexibly clamped, after the multi-jaw moves to a position where it comes into contact with the workpiece and is pressurized to a set value.

Description

Fixing jig for precision machining workpiece

The present invention relates to a workpiece fixing jig for precision machining, and more specifically, to a workpiece fixing jig for precision machining, which is structurally improved so that the positions of the first and second clamp arms are independently corrected by a first spline clutch, thereby providing versatility in clamping not only workpieces with symmetrical shapes on both sides but also workpieces with asymmetrical shapes, and in particular, is configured to pressurize the workpiece to a set value after moving the multi-jaw to a position where it comes into contact with the workpiece, thereby enabling flexible clamping of workpieces with irregular external shapes.

Typically, a machining center is a device that performs machining processes including flat cutting, curved cutting, various groove processing, screwing, drilling, tapping, and boring by mounting various tools on a spindle. At this time, the workpiece is clamped in a vise, but when trimming the edge of the workpiece and machining a hole, the clamping direction of the workpiece must be changed due to interference between the cutting tool and the vise.

That is, a vise can fix various machining objects by moving the jaws and pressing and fixing the workpiece, but since each jaw must press symmetrically with respect to the other, it is difficult to fix the left and right of a workpiece with a slanted bend formed at the edge, and even if it is fixed by pressing up and down, each jaw acts as an obstacle.

Accordingly, in the previously disclosed registered patent 10-1751293, a precision machining part fixing device for fixing an entire machined part comprising a first machining part on the front side and a second machining part positioned on the rear side of the first machining part and having a smaller width than the width of the first machining part and formed in steps on both ends of the first machining part, is provided, wherein a first rotation shaft is installed on the upper part of a base plate to fix both sides of the first machining part of the machined part and is connected to the rotation shaft of a first rotation motor, and a first blocking tab protrudes in a ring shape on the outer surface of the center, and a screw line is formed on each outer surface in the longitudinal direction of one side and the other side based on a first blocking tab protruding in a ring shape on the outer surface of the center, and a pair of horizontal first rotation shafts are installed in a symmetrical structure on the outer surfaces of one side and the other side of the first rotation shaft so that the directions of the screw line have a symmetrical structure, and a first support part on one side and a moving axis on the other side extending horizontally on one surface of the first support part are integrally formed, and are internally connected to the first rotation shaft. A first operating rotating member comprising a first screw hole having a screw line formed on the inner surface thereof and a second blocking tab protruding in a ring shape is formed on the outer surface end of the moving shaft so as to be screw-joined while penetrating from one surface of the moving shaft to the other surface of the support member; and an operating body having a screw line formed on the outer surface of the moving shaft; and a first rotating body having a second screw hole having a screw line formed on the inner surface thereof and penetrating so as to be screw-joined with the outer surface of the moving shaft, which is symmetrically installed on the outer surface of each of the moving shafts so as to fix both sides of the second processing portion of the machined part; a first rotating body having a third blocking tab protruding in a ring shape on one end of the outer surface of the first rotating body and a ring-shaped vertical gear having a sawtooth portion provided on the entire outer surface of the other end of the outer surface of the first rotating body, and a second supporting part having a first insertion hole penetrating in the front and a second insertion hole penetrating in the rear so as to be coupled to the outer surface of the rotating body of the first rotating body; and a second supporting part having a first insertion hole penetrating in the front and a second insertion hole penetrating in the rear so as to be inserted into the second insertion hole of the second supporting part and inserted on both sides. A technology has been previously presented comprising a second rotating body having a first rotating hole formed therethrough and a fourth blocking tab in the shape of a ring formed at one end thereof, a second rotating body having a second rotating hole formed therethrough and communicating with the first rotating hole of the first rotating body while having a toothed portion formed on the outer circumference of the other end of the second rotating body to rotate by engaging with the toothed portion of the large gear, and a second rotating shaft having a first bevel gear at one end thereof and connected to the first rotating hole and the second rotating hole of the second rotating body provided in the second support portion while being provided in each of the first rotating bodies, and a second rotating motor having a second bevel gear connected thereto that engages with the first bevel gear of the second rotating shaft to transmit rotation.

However, the above-mentioned prior art is intended to eliminate axial machining errors when machining a machining part by fixing a machining part formed in a stepped shape on both sides, but has a complex structure, and has problems in that the machining part is clamped with different clamping forces due to an operational error between a pair of contact plates and a pair of second support parts, resulting in machining defects due to movement during cutting.

KR 10-1751293 B1

Accordingly, the present invention has been conceived to solve the above-mentioned problem, and the structure is improved so that the positions of the first and second clamp arms are independently corrected by the first spline clutch, thereby providing versatility in clamping not only symmetrical workpieces on both sides but also asymmetrical workpieces, and in particular, the purpose is to provide a precision machining workpiece fixing jig that can flexibly clamp workpieces with irregular external shapes by configuring that the multi-jaw moves to a position where it comes into contact with the workpiece and then pressurizes it to a set value.

In order to achieve this purpose, the present invention is characterized by comprising: a base plate (10) mounted on a table of a machine tool and provided with an x, y-axis setting block (11) for guiding a loading position of a workpiece (A); a driving screw (20) installed transversely on the base plate (10), the rotational movement of which is controlled by a servo motor (21), and having a first spline shaft (22) provided at one end thereof; a driven screw (30) arranged in a straight line with the driving screw (20), having a second spline shaft (32) provided at an end corresponding to the first spline shaft (22), and formed in a spiral direction opposite to that of the driving screw (20); A first spline clutch (40) having a first spline boss (41) that is key-coupled to the first spline shaft (22) and is installed so as to be rotatable and is provided to connect/disconnect the first and second spline shafts (22) (32) by linear movement by a driving unit; a first clamp arm (50) that is screw-connected to the driving screw (20), is linearly pitch-transferred in connection with the rotational movement of the driving screw (20), and is provided with a first main jaw (51) that clamps a workpiece (A) at an end; a second clamp arm (60) that is screw-connected to the driven screw (30), is linearly pitch-transferred in connection with the rotational movement of the driven screw (30), and is provided with a second main jaw (61) that clamps a workpiece (A) at an end; It is characterized by including a first multi-jaw (70) installed on the first clamp arm (50) and provided to clamp a workpiece (A) at a position spaced apart from the first main jaw (51) by being linearly transported by a driving unit; a second multi-jaw (80) installed on the second clamp arm (60) and provided to clamp a workpiece (A) at a position spaced apart from the second main jaw (61) by being linearly transported by a driving unit; and a load bar (90) arranged parallel to the driving screw (20) and inserted into the first and second clamp arms (50) (60) to guide linear movement of the first and second clamp arms (50) (60).

At this time, when the workpiece (A) having symmetrical shapes on both sides based on the x, y-axis setting block (11) is loaded, the first and second spline shafts (22) (32) are connected by the first spline clutch (40), the first and second spline shafts (22) (32) are linked and driven by the servo motor (21), and the first and second clamp arms (50) (60) are linearly moved in opposite directions by the rotational movement of the first and second spline shafts (22) (32), so that the first and second main jaws (51) (61) clamp the first and second sides of the workpiece (A), and thereafter, the first and second multi-jaws (70) (80) are linearly moved by the driving unit at a position spaced apart from the first and second main jaws (51) (61). It is characterized by being equipped to clamp both sides of the workpiece (A).

In addition, when the workpiece (A) having an asymmetrical shape on both sides based on the x, y-axis setting block (11) is loaded, the first and second spline shafts (22) (32) are separated by the first spline clutch (40), the first spline shaft (22) is driven by the servo motor (21) to correct the position of the first clamp arm (50), and then, when the first and second spline shafts (22) (32) are connected by the first spline clutch (40), and the first and second spline shafts (22) (32) are linked and driven by the servo motor (21), the first and second clamp arms (50) (60) are linearly moved in opposite directions to each other so that the first and second main jaws (51) (61) firstly It is characterized in that the first and second multi-joints (70)(80) are linearly transported by the driving unit to clamp both sides of the workpiece (A) at a position spaced apart from the first and second main joints (51)(61).

In addition, at the point where the first and second spline shafts (22) (32) are connected to each other by the first spline clutch (40), the splines (S) of the first and second spline shafts (22) (32) are aligned in a straight line by the angle correction module (100), and the angle correction module (100) is arranged opposite to the first spline clutch (40), and the second spline boss (101) that is key-coupled to the second spline shaft (32) is installed so as to be rotatable, and the second spline clutch (102) that is linearly moved by the driving unit, the first side ring gear (103) formed on the side of the first spline boss (41) corresponding to the second spline boss (101), and the first side ring gear (103) corresponding to the first side ring gear (103) It is characterized in that it includes a second side ring gear (104) formed on the side of a second spline boss (101) and provided so as to be able to mesh with a first side ring gear (103), and when the first spline clutch (40) moves toward the second spline shaft (32) to connect the first and second spline shafts (22) (32), the first and second spline shafts (22) (32) rotate during the process of meshing the first side ring gear (103) and the second side ring gear (104) with each other, and the splines (S) are angle-corrected so as to be aligned in a straight line, and then a part of the first spline clutch (40) is fastened to the second spline shaft (32) to connect the first and second spline shafts (22) (32).

According to the above configuration and operation, the present invention provides versatility in that it can clamp not only symmetrical workpieces but also asymmetrical workpieces by improving the structure so that the positions of the first and second clamp arms are independently corrected by the first spline clutch, and in particular, it has the effect of being able to flexibly clamp workpieces having irregular external shapes by being configured so that the multi-jaw moves to a position where it comes into contact with the workpiece and then pressurizes it to a set value.

Figure 1 is a schematic diagram showing the entire structure of a precision machining workpiece fixing jig according to one embodiment of the present invention in a plan view.
Figure 2 is a schematic diagram showing the operating state of Figure 1.
Figures 3 and 4 are diagrams showing a state of clamping an asymmetric workpiece using a precision machining workpiece fixing jig according to one embodiment of the present invention.
Figure 5 is a configuration diagram showing an angle correction module of a precision machining workpiece fixing jig according to one embodiment of the present invention.
Figure 6 is a configuration diagram showing the operating state of the angle correction module of a workpiece fixing jig for precision machining according to one embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. In describing the present invention, detailed descriptions of related known functions that are obvious to those skilled in the art and that may unnecessarily obscure the gist of the present invention will be omitted.

FIG. 1 is a schematic diagram showing the entirety of a precision machining workpiece fixing jig in a plan view according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing the operating state of FIG. 1, FIGS. 3 to 4 are schematic diagrams showing a state of clamping an asymmetric workpiece using a precision machining workpiece fixing jig according to an embodiment of the present invention, FIG. 5 is a schematic diagram showing an angle correction module of a precision machining workpiece fixing jig according to an embodiment of the present invention, and FIG. 6 is a schematic diagram showing an operating state of an angle correction module of a precision machining workpiece fixing jig according to an embodiment of the present invention.

The present invention relates to a workpiece fixing jig for precision machining, which is structurally improved so that the positions of the first and second clamp arms can be independently corrected by the first spline clutch, thereby providing versatility in clamping not only workpieces with symmetrical shapes on both sides but also workpieces with asymmetrical shapes, and in particular, the jig comprises a base plate (10), a driving screw (20), a driven screw (30), a first spline clutch (40), a first clamp arm (50), a second clamp arm (60), a first multi-jaw (70), a second multi-jaw (80), and a load bar (90) as its main components, so that workpieces with irregular shapes can be flexibly clamped, after the multi-jaw moves to a position where it comes into contact with the workpiece and is pressurized to a set value.

The base plate (10) according to the present invention is mounted on the table of a machine tool and is provided with an x, y-axis setting block (11) that guides the loading position of the workpiece (A).

The above base plate (10) is detachably installed on the table of the machine tool by a fastening means including a bolt, and a driving screw (20) and a driven screw (30) described later are rotatably provided on the upper portion.

In addition, the above x, y-axis setting block (11) is formed in an ‘ㄱ’ shape and is provided to guide the loading position by coming into contact with the workpiece (A) in the x, y-axis direction.

In addition, the driving screw (20) according to the present invention is installed transversely on the base plate (10), its rotational motion is controlled by a servo motor (21), and a first spline shaft (22) is provided at one end.

The above driving screw (20) is installed so as to be rotatable with both ends supported by a bearing housing, and a servo motor (21) is installed at one end.

In addition, the driving screw (20) is provided to transmit power to the driven screw (30) described later through the first spline shaft (22) formed on the other end.

In addition, the driven screw (30) according to the present invention is arranged in a straight line with the driving screw (20), and has a second spline shaft (32) provided at an end corresponding to the first spline shaft (22), and is formed in a spiral direction opposite to that of the driving screw (20).

The above-mentioned driven screw (30) is installed so as to be rotatable while both ends are supported by a bearing housing, and is provided to be connected to the driving screw (20) through a second spline shaft (32) formed at one end.

In addition, the first spline clutch (40) according to the present invention is provided such that the first spline boss (41) that is key-coupled to the first spline shaft (22) is installed so as to be rotatable, and is linearly moved by a driving unit to connect/disconnect the first and second spline shafts (22) (32).

That is, when the first spline boss (41) is positioned on the first spline shaft (22) by the linear movement of the first spline clutch (40), the driving screw (20) and the driven screw (30) are separated, and when the first spline boss (41) is positioned to accommodate both the first and second spline shafts (22) (32), the driving screw (20) and the driven screw (30) are connected and driven in a linked manner.

In addition, the first clamp arm (50) according to the present invention is screw-coupled to the driving screw (20), and is provided with a first main jaw (51) that is connected to the rotational movement of the driving screw (20) to move in a straight pitch and clamps the workpiece (A) at the end.

The above first clamp arm (50) is arranged in a direction perpendicular to the driving screw (20) and is provided to clamp the workpiece (A) at a position opposite to the second clamp arm (60) described later.

In addition, the second clamp arm (60) according to the present invention is screw-coupled to the driven screw (30), and is provided with a second main jaw (61) that is connected to the rotational movement of the driven screw (30) and moves in a linear pitch, and clamps the workpiece (A) at the end.

The second clamp arm (60) is arranged in a direction perpendicular to the driven screw (30) and is provided to clamp the workpiece (A) at a position opposite to the first clamp arm (50).

In addition, the first multi-task (70) according to the present invention is installed on the first clamp arm (50) and is provided to clamp the workpiece (A) at a position spaced apart from the first maintask (51) by being linearly transported by the driving unit.

The first multi-task (70) is provided with a conveying pressure set by a hydraulic or pneumatic cylinder, and the conveying force is stopped the moment the pressure reaches the set value while the first multi-task (70) is in contact with the workpiece (A).

Accordingly, the first multi-joint (70) moves to a position where it comes into contact with the workpiece (A) and then pressurizes it to a set value, thereby providing versatility in clamping a workpiece (A) having an irregular shape flexibly.

In addition, the second multi-task (80) according to the present invention is installed on the second clamp arm (60) and is provided to clamp the workpiece (A) at a position spaced apart from the second maintask (61) by being linearly transported by the driving unit.

The second multi-task (80) is provided so that the transfer pressure is set by a hydraulic or pneumatic cylinder, and the transfer force is stopped the moment the pressure reaches the set value while the second multi-task (80) is in contact with the workpiece (A).

Accordingly, the first multi-joint (80) moves to a position where it comes into contact with the workpiece (A) and then pressurizes it to a set value, thereby providing versatility in clamping a workpiece (A) having an irregular shape flexibly.

In addition, the load bar (90) according to the present invention is arranged parallel to the driving screw (20) and is inserted into the first and second clamp arms (50) (60) to guide the linear movement of the first and second clamp arms (50) (60).

That is, the first and second clamp arms (50) (60) are connected in a state where they are inserted into the load bar (90), and when the driving screw (20) and the driven screw (30) rotate, the first and second clamp arms (50) (60) move in a straight line while being supported by the load bar (90).

In Fig. 2, when a workpiece (A) having symmetrical sides is loaded based on the x, y-axis setting block (11), the first and second spline shafts (22) (32) are connected by the first spline clutch (40), the first and second spline shafts (22) (32) are linked and driven by the servo motor (21), and the first and second clamp arms (50) (60) are linearly moved in opposite directions by the rotational movement of the first and second spline shafts (22) (32), so that the first and second main jaws (51) (61) clamp the first and second sides of the workpiece (A), and thereafter, the first and second multi-jaws (70) (80) are linearly moved by the driving unit at a position spaced apart from the first and second main jaws (51) (61). It is equipped to clamp both sides of the workpiece (A).

In addition, when a workpiece (A) having an asymmetrical shape on both sides is loaded based on the x, y-axis setting block (11), as shown in FIG. 3, the first and second spline shafts (22) (32) are separated by the first spline clutch (40), and the first spline shaft (22) is driven by the servo motor (21) to correct the position of the first clamp arm (50).

At this time, the position of the first clamp arm (50) is corrected based on the x, y-axis setting block (11).

Next, as shown in FIG. 4, when the first and second spline shafts (22) (32) are connected by the first spline clutch (40) and the first and second spline shafts (22) (32) are driven in conjunction by the servo motor (21), the first and second clamp arms (50) (60) are linearly moved in opposite directions so that the first and second main jaws (51) (61) clamp both sides of the workpiece (A) for the first time, and thereafter, the first and second multi-jaws (70) (80) are linearly moved by the driving unit so as to clamp both sides of the workpiece (A) at a position spaced apart from the first and second main jaws (51) (61).

In this way, since the positions of the first and second clamp arms (50) (60) are independently corrected by the first spline clutch (40), versatility is provided that allows clamping not only a symmetrical workpiece (A) but also an asymmetrical workpiece (A) on both sides.

In FIGS. 5 and 6, at the point where the first and second spline shafts (22) and (32) are connected to each other by the first spline clutch (40), the splines (S) of the first and second spline shafts (22) and (32) are aligned in a straight line by the angle correction module (100).

The above angle correction module (100) includes a second spline clutch (102) that is arranged opposite to the first spline clutch (40) and has a second spline boss (101) that is key-coupled to the second spline shaft (32) and is installed so as to be rotatable, and is moved linearly by a driving unit, a first side ring gear (103) that is formed on the side of the first spline boss (41) corresponding to the second spline boss (101), and a second side ring gear (104) that is formed on the side of the second spline boss (101) corresponding to the first side ring gear (103) and is provided so as to be meshed with the first side ring gear (103).

And, when the first spline clutch (40) moves toward the second spline shaft (32) to connect the first and second spline shafts (22) (32), as shown in FIG. 6 (a), during the process in which the first side ring gear (103) and the second side ring gear (104) are engaged with each other, as shown in the enlarged view of FIG. 6 (a), the driving screw (20) and the driven screw (30) rotate, and the splines (S) of the first and second spline shafts (22) (32) are angle-corrected to align in a straight line, and then, as shown in FIG. 6 (b), a part of the first spline clutch (40) is fastened to the second spline shaft (32) to connect the first and second spline shafts (22) (32).

In this way, when the first spline clutch (40) moves toward the second spline shaft (32) by the angle correction module (100), the splines (S) of the first and second spline shafts (22) (32) are angle-corrected to align in a straight line, so that the first spline clutch (40) can be fastened to the spline (S) of the second spline shaft (32) without interference, thereby preventing malfunction.

While the detailed description of the present invention has described the most preferred embodiments thereof, it will be appreciated that various modifications are possible without departing from the technical scope of the present invention. Therefore, the scope of protection of the present invention should not be limited to the above-described embodiments, but should also extend to the technologies described in the following claims and equivalent technical means derived from these technologies.

10: Base plate 20: Drive screw
30: Driven screw 40: First spline clutch
50: 1st clamp arm 60: 2nd clamp arm
70: 1st multi-group 80: 2nd multi-group
90: Load bar 100: Angle correction module

Claims (4)

A base plate (10) mounted on a table of a machine tool and equipped with an x, y-axis setting block (11) that guides the loading position of a workpiece (A);
A driving screw (20) installed transversely on the base plate (10), the rotational movement of which is controlled by a servo motor (21), and having a first spline shaft (22) provided at one end;
A driven screw (30) arranged in a straight line with the driving screw (20), having a second spline shaft (32) at an end corresponding to the first spline shaft (22), and formed in a spiral direction opposite to that of the driving screw (20);
A first spline clutch (40) having a first spline boss (41) that is key-coupled to the first spline shaft (22) and is installed so as to be rotatable, and is provided to connect/disconnect the first and second spline shafts (22) (32) by linear movement by a driving unit;
A first clamp arm (50) that is screw-coupled to the above driving screw (20), is moved in a linear pitch in conjunction with the rotational movement of the driving screw (20), and is provided with a first main jaw (51) that clamps a workpiece (A) at an end;
A second clamp arm (60) that is screw-coupled to the above-mentioned driven screw (30), is moved in a linear pitch in conjunction with the rotational movement of the driven screw (30), and is provided with a second main jaw (61) that clamps a workpiece (A) at an end;
A first multi-joint (70) installed on the first clamp arm (50) and provided to clamp a workpiece (A) at a position spaced apart from the first main joint (51) by being linearly transported by a driving unit;
A second multi-joint (80) installed on the second clamp arm (60) and provided to clamp the workpiece (A) at a position spaced apart from the second main joint (61) by being linearly transported by the driving unit; and
A precision machining workpiece fixing jig characterized by including a load bar (90) arranged parallel to the driving screw (20) and inserted into the first and second clamp arms (50) (60) to guide the linear movement of the first and second clamp arms (50) (60).
In paragraph 1,
When a workpiece (A) with symmetrical shapes on both sides is loaded based on the above x, y-axis setting block (11),
With the first and second spline shafts (22) (32) connected by the first spline clutch (40), the first and second spline shafts (22) (32) are linked and driven by the servo motor (21), and the first and second clamp arms (50) (60) are linearly moved in opposite directions by the rotational movement of the first and second spline shafts (22) (32), so that the first and second main jaws (51) (61) clamp both sides of the workpiece (A) for the first time.
A precision machining workpiece fixing jig characterized in that the first and second multi-joints (70)(80) are linearly moved by the driving unit and clamp both sides of the workpiece (A) at a position spaced apart from the first and second main joints (51)(61).
In paragraph 1,
When a workpiece (A) with an asymmetrical shape on both sides is loaded based on the above x, y-axis setting block (11),
With the first and second spline shafts (22) (32) separated by the first spline clutch (40), the first spline shaft (22) is driven by the servo motor (21) to correct the position of the first clamp arm (50).
Next, when the first and second spline shafts (22) (32) are connected by the first spline clutch (40) and the first and second spline shafts (22) (32) are driven in conjunction by the servo motor (21), the first and second clamp arms (50) (60) are linearly moved in opposite directions to each other so that the first and second main jaws (51) (61) clamp both sides of the workpiece (A) for the first time.
A precision machining workpiece fixing jig characterized in that the first and second multi-joints (70)(80) are linearly moved by the driving unit and clamp both sides of the workpiece (A) at a position spaced apart from the first and second main joints (51)(61).
In the third paragraph,
At the point when the first and second spline shafts (22) and (32) are connected to each other by the first spline clutch (40), the splines (S) of the first and second spline shafts (22) and (32) are aligned in a straight line by the angle correction module (100).
The above angle correction module (100) is
A second spline boss (101) is installed so as to be rotatable and is key-coupled to a second spline shaft (32) and is positioned opposite to the first spline clutch (40), and a second spline clutch (102) that is moved linearly by a driving unit,
A first side ring gear (103) formed on the side of the first spline boss (41) corresponding to the second spline boss (101),
It includes a second side ring gear (104) formed on the side of the second spline boss (101) corresponding to the first side ring gear (103) and provided so as to be meshed with the first side ring gear (103).
A precision machining workpiece fixing jig characterized in that, when the first spline clutch (40) moves toward the second spline shaft (32) to connect the first and second spline shafts (22) (32), the first side ring gear (103) and the second side ring gear (104) are engaged with each other, the first and second spline shafts (22) (32) rotate, and the splines (S) are angle-corrected to align on a straight line, and then a part of the first spline clutch (40) is fastened to the second spline shaft (32) to connect the first and second spline shafts (22) (32).