A positioning tool for valve body machining and positioning method thereof

Abstract

The present invention relates to a positioning tool for valve body machining and a positioning method thereof. A No. 1 positioning boss and a No. 2 positioning boss are precast on both sides of the valve body. The positioning tool comprises a tool bottom plate, a No. 1 positioning base, a No. 2 positioning base, a No. 3 positioning base and a No. 4 positioning base installed on the tool bottom plate. An adjustable support column is installed on the No. 1 positioning base, and a first fixed support platform is provided on the No. 2 positioning base. The adjustable support column and the first fixed support platform are respectively used to support the two No. 1 positioning bosses; a floating support column is installed on the No. 3 positioning base, and a second fixed support platform is installed on the No. 4 positioning base. When the valve body is positioned, the floating support column and the positioning pin are respectively used to be inserted into the positioning inner groove holes on the bottom surfaces of the two No. 2 positioning bosses. The positioning tool adopts two fixed supports, one adjustable support and one floating support to realize the positioning of the valve body, which is easy to operate and has high positioning accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of machining positioning, and in particular to a positioning tool and a positioning method thereof for machining a valve body. Background Art

[0002] The valve body of the oil pipeline control valve is first cast and then needs to be fine-machined in a horizontal machining center. Therefore, a special positioning tool is needed to clamp the valve body on the horizontal machining center for fine machining. Since the surface of the valve body is usually an irregular curved surface, the four-side pushing positioning method is currently commonly used to position the valve body. For example, the Chinese patent with the authorization announcement number CN204771684U: A combined tool for valve body processing, the patent uses a four-side pushing positioning method to achieve valve body positioning. This positioning method easily causes the valve body to deform due to clamping stress, and the positioning operation is troublesome and inaccurate. Therefore, it is necessary to design a positioning tool for valve body machining that is convenient and accurate in positioning operation. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a positioning tool for valve body machining which has reasonable structural design, convenient operation and high positioning accuracy, and to provide a positioning method thereof.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is: a positioning tool for valve body machining, a No. 1 positioning boss and a No. 2 positioning boss are pre-cast on both sides of the valve body, the two No. 1 positioning bosses are diagonally distributed, and the two No. 2 positioning bosses are diagonally distributed, and the bottom surfaces of the No. 1 positioning boss and the No. 2 positioning boss are both flat, and the bottom surface of the No. 2 positioning boss is provided with a positioning inner groove hole; the positioning tool includes a tool bottom plate, characterized in that: the positioning tool also includes a No. 1 positioning base, a No. 2 positioning base, a No. 3 positioning base and a No. 4 positioning base installed on the tool bottom plate, and the four positioning bases are distributed in a rectangular shape, wherein the No. 1 positioning base and the No. 2 positioning base are diagonally distributed, and the No. 3 positioning base and the No. 4 positioning base are diagonally distributed. The first positioning base is vertically provided with an adjustable support column with adjustable height, the second positioning base is provided with a first fixed support platform, the adjustable support column and the first fixed support platform are respectively used to support the two first positioning bosses; the third positioning base is provided with a floating support column that can float up and down, the upper part of the floating support column is conical, the fourth positioning base is provided with a second fixed support platform, and a positioning pin is installed on the second fixed support platform, when the valve body is positioned, the floating support column and the positioning pin are respectively used to be inserted into the positioning inner groove holes on the bottom surfaces of the two second positioning bosses; the four positioning bases are each provided with a clamping block for vertically clamping the respective positioned positioning bosses.

[0005] Preferably, the adjustable support column is height-adjustable by being threadedly connected to a positioning base; the positioning base is provided with a vertical threaded hole, and the adjustable support column adopts a stud with an external thread; the adjustable support column is installed in the threaded hole, and its upper part extends out of the threaded hole.

[0006] Preferably, the floating support column is a stepped column which is thick at the bottom and thin at the top, and a stepped accommodating hole which is thick at the bottom and thin at the top and matches the floating support column is opened on the No. 3 positioning base, and a floating adjustment spring is installed at the bottom of the step accommodating hole, the floating support column is installed in the step accommodating hole, and the upper end of the floating adjustment spring contacts the bottom end of the floating support column, and the top end of the floating support column is exposed from the step accommodating hole.

[0007] Preferably, both sides of the top of the positioning base extend upward to form two side limit plates, the clamping block is placed between the two side limit plates, and the clamping block is connected to the positioning base through a clamping stud.

[0008] Preferably, a clamping guide column is arranged between the limiting plates on both sides, and a guide hole for allowing the clamping guide column to pass through is opened on the clamping block.

[0009] Preferably, the top surface of the first fixed support platform and the top surface of the second fixed support platform are at the same height.

[0010] The present invention also provides a positioning method for a positioning tool used for valve body machining:

[0011] First, the two No. 2 positioning bosses and one No. 1 positioning boss are positioned using the three-point coplanarity principle: the first fixed support platform on the No. 2 positioning base supports one No. 1 positioning boss, the floating support column on the No. 3 positioning base and the positioning pin on the No. 4 positioning base are respectively inserted into the positioning inner groove holes on the bottom surfaces of the two No. 2 positioning bosses to limit the horizontal movement of the valve body, and the second fixed support platform supports one of the No. 2 positioning bosses;

[0012] Then, manually adjust the adjustable support column so that the adjustable support column supports another No. 1 positioning boss. After the adjustment is in place, the contact surface between the adjustable support column and the No. 1 positioning boss, the contact surface between the first fixed support platform and the No. 1 positioning boss, the contact surface between the second fixed support platform and the No. 2 positioning boss, and the contact surface between the floating support column and the No. 2 positioning boss are located in the same plane;

[0013] Finally, each positioning boss is clamped vertically using a clamping block to complete the positioning.

[0014] Compared with the prior art, the present invention has the following advantages and effects:

[0015] 1. This positioning tool adopts two fixed supports, one adjustable support and one floating support to realize the positioning of the valve body. It is easy to operate, has high positioning accuracy, and does not generate clamping stress, thus avoiding deformation of the valve body due to clamping stress.

[0016] 2. Considering the size error of the positioning inner groove holes on the bottom surface of the two No. 2 positioning bosses on both sides of the valve body, the upper part of the floating support column is designed to be conical to ensure that the floating support column and the positioning pin can be inserted into the two positioning inner groove holes;

[0017] 3. In the positioning method, two fixed supports and one floating support are first used to achieve three-point coplanar positioning, and then the adjustable support is used to achieve four-point coplanar positioning, and the positioning effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the structure of the valve body in the embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the positioning tool in an embodiment of the present invention.

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the positioning tool for positioning the valve body in an embodiment of the present invention.

[0022] Figure 4 yes Figure 3 Schematic diagram of the top view structure.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the No. 1 positioning base in an embodiment of the present invention.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the second positioning base in an embodiment of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the fourth positioning base in the embodiment of the present invention.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the No. 3 positioning base in the embodiment of the present invention.

[0027] Fig. 9 It is a schematic diagram of the main structure of the No. 3 positioning base in the embodiment of the present invention.

[0028] Fig.10 yes Fig. 9 AA section view of the structure.

[0029] Description of reference numerals:

[0030] Valve body 1, No. 1 positioning boss 2, No. 2 positioning boss 3, positioning inner groove hole 31,

[0031] Tooling base plate 4, No. 1 positioning base 5, No. 2 positioning base 6, No. 3 positioning base 7, No. 4 positioning base 8,

[0032] Adjustable support column 51,

[0033] The first fixed support platform 61,

[0034] Floating support column 71, stepped receiving hole 72, floating adjustment spring 73,

[0035] The second fixed support platform 81, the positioning pin 82,

[0036] Pressing block 9 , pressing stud 10 , pressing guide column 111 , and guide hole 91 . DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0038] Example

[0039] See also Figures 1 to 10 .

[0040] The present embodiment discloses a positioning tool for valve body machining. After the valve body is formed by a casting mold, it needs to be fine-machined in a horizontal machining center. Therefore, a corresponding positioning tool is required to fix the valve body on the machining center. In order to position the valve body, a No. 1 positioning boss 2 and a No. 2 positioning boss 3 are pre-cast on both sides of the valve body 1. The two No. 1 positioning bosses 2 are diagonally distributed, and the two No. 2 positioning bosses 3 are diagonally distributed. The bottom surfaces of the No. 1 positioning boss 2 and the No. 2 positioning boss 3 are both flat, and the bottom surface of the No. 2 positioning boss 3 is provided with a positioning inner groove hole 31.

[0041] In this embodiment, the positioning tooling includes a tooling base plate 4 and a No. 1 positioning base 5, a No. 2 positioning base 6, a No. 3 positioning base 7 and a No. 4 positioning base 8 installed on the tooling base plate 4. The four positioning bases 5, 6, 7, and 8 are distributed in a rectangular shape, wherein the No. 1 positioning base 5 and the No. 2 positioning base 6 are distributed diagonally, and the No. 3 positioning base 7 and the No. 4 positioning base 8 are distributed diagonally. The four positioning bases correspond one to one with the four positioning bosses on both sides of the valve body, and one positioning base acts on one positioning boss.

[0042] In this embodiment, an adjustable support column 51 with adjustable height is vertically installed on the No. 1 positioning base 5, and a first fixed support platform 61 is provided on the No. 2 positioning base 6. The adjustable support column 51 and the first fixed support platform 61 are respectively used to support the two No. 1 positioning bosses 2. Specifically, the adjustable support column 51 is height-adjustable by being threadedly connected with the positioning base 5; the positioning base 5 is provided with a vertical threaded hole, and the adjustable support column 51 adopts a stud with an external thread; the adjustable support column 51 is installed in the threaded hole, and its upper part extends out of the threaded hole, and can be manually adjusted.

[0043] In this embodiment, a floating support column 71 that can float up and down is installed on the No. 3 positioning base 7, and the upper part of the floating support column 71 is conical. A second fixed support platform 81 is installed on the No. 4 positioning base 8, and a positioning pin 82 is installed on the second fixed support platform 81. The top surface of the first fixed support platform 61 and the top surface of the second fixed support platform 81 are at the same height. When the valve body is positioned, the floating support column 71 and the positioning pin 82 are respectively used to be inserted into the positioning inner groove holes 31 on the bottom surfaces of the two No. 2 positioning bosses 3 to limit the horizontal movement of the valve body. Specifically, the floating support column 71 is a stepped column that is thick at the bottom and thin at the top. A stepped accommodating hole 72 that is thick at the bottom and thin at the top and matches the floating support column 71 is opened on the No. 3 positioning base 7. A floating adjustment spring 73 is installed at the bottom of the step accommodating hole 72. The floating support column 71 is installed in the step accommodating hole 72, and the upper end of the floating adjustment spring 73 contacts the bottom end of the floating support column 71, and the top end of the floating support column 71 is exposed from the step accommodating hole 72.

[0044] In this embodiment, each of the four positioning bases 5, 6, 7, and 8 is provided with a clamping block 9 for clamping the positioning boss in the vertical direction. Specifically, both sides of the top of the positioning bases 5, 6, 7, and 8 extend upward to form two side limit plates a, and the clamping block 9 is placed between the two side limit plates a, and the clamping block 9 is connected to the positioning bases 5, 6, 7, and 8 through a clamping stud 10. A clamping guide column 111 is provided between the two side limit plates a, and a guide hole 91 is provided on the clamping block 9 to allow the clamping guide column 111 to pass through.

[0045] In this embodiment, a positioning method for a positioning tool for valve body machining is also provided:

[0046] First, the two No. 2 positioning bosses 3 and one No. 1 positioning boss 2 are positioned using the three-point coplanarity principle: the first fixed support platform 61 on the No. 2 positioning base 6 supports one No. 1 positioning boss 2, the floating support column 71 on the No. 3 positioning base 7 and the positioning pin 82 on the No. 4 positioning base 8 are respectively inserted into the positioning inner groove holes 31 on the bottom surfaces of the two No. 2 positioning bosses 3 to limit the horizontal movement of the valve body, and the second fixed support platform 81 supports one of the No. 2 positioning bosses 3;

[0047] Then, manually adjust the adjustable support column 51 so that the adjustable support column 51 supports another No. 1 positioning boss 2. After the adjustment is in place, the contact surface between the adjustable support column 51 and the No. 1 positioning boss 2, the contact surface between the first fixed support platform 61 and the No. 1 positioning boss 2, the contact surface between the second fixed support platform 81 and the No. 2 positioning boss 3, and the contact surface between the floating support column 71 and the No. 2 positioning boss 3 are located in the same plane;

[0048] Finally, each positioning boss is clamped in the vertical direction by using the clamping block 9 to complete the positioning.

[0049] The positioning tool adopts two fixed supports (the first fixed support platform 61 and the second fixed support platform 81), one adjustable support (adjustable support column 51), and one floating support (floating support column 71) to realize the positioning of the valve body. It is easy to operate, has high positioning accuracy, and does not generate clamping stress, thereby avoiding deformation of the valve body due to clamping stress. In the positioning method, two fixed supports and one floating support are first used to realize three-point coplanar positioning, and then the adjustable support is used to realize four-point coplanar positioning, and the positioning effect is good.

[0050] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles of the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A positioning tool for valve body machining, wherein a first positioning boss (2) and a second positioning boss (3) are precast on both sides of the valve body (1), the two first positioning bosses (2) are diagonally distributed, the two second positioning bosses (3) are diagonally distributed, the bottom surfaces of the first positioning boss (2) and the second positioning boss (3) are both flat, and the bottom surface of the second positioning boss (3) is provided with a positioning inner groove hole (31); the positioning tool comprises a tool bottom plate (4), characterized in that: The positioning tool further comprises a first positioning base (5), a second positioning base (6), a third positioning base (7) and a fourth positioning base (8) mounted on the tool base plate (4); the first positioning base (5), the second positioning base (6), the third positioning base (7) and the fourth positioning base (8) are arranged in a rectangular shape, wherein the first positioning base (5) and the second positioning base (6) are arranged diagonally, and the third positioning base (7) and the fourth positioning base (8) are arranged diagonally; An adjustable support column (51) with adjustable height is vertically mounted on the No. 1 positioning base (5), and a first fixed support platform (61) is provided on the No. 2 positioning base (6), wherein the adjustable support column (51) and the first fixed support platform (61) are respectively used to support the two No. 1 positioning bosses (2); A floating support column (71) capable of floating up and down is installed on the No. 3 positioning base (7), and the upper part of the floating support column (71) is conical. A second fixed support platform (81) is installed on the No. 4 positioning base (8), and a positioning pin (82) is installed on the second fixed support platform (81). When the valve body is positioned, the floating support column (71) and the positioning pin (82) are respectively used to be inserted into the positioning inner groove holes (31) on the bottom surfaces of the two No. 2 positioning bosses (3); The first positioning base (5), the second positioning base (6), the third positioning base (7) and the fourth positioning base (8) are each provided with a clamping block (9) for clamping the respective positioning bosses in a vertical direction; The adjustable support column (51) is height-adjustable by being threadedly connected to the first positioning base (5); the first positioning base (5) is provided with a vertical threaded hole, and the adjustable support column (51) is a stud with an external thread; the adjustable support column (51) is installed in the threaded hole, and its upper part protrudes from the threaded hole; The top surface of the first fixed support platform (61) and the top surface of the second fixed support platform (81) are at the same height.

2. The positioning tool for valve body machining according to claim 1, characterized in that: The floating support column (71) is in the form of a stepped column with a thick lower portion and a thin upper portion. The No. 3 positioning base (7) is provided with a stepped receiving hole (72) with a thick lower portion and a thin upper portion, which matches the floating support column (71). A floating adjustment spring (73) is installed at the lower portion of the stepped receiving hole (72). The floating support column (71) is installed in the stepped receiving hole (72), and the upper end of the floating adjustment spring (73) contacts the bottom end of the floating support column (71), and the top end of the floating support column (71) is exposed from the stepped receiving hole (72).

3. The positioning tool for valve body machining according to claim 1, characterized in that: Both sides of the top of the No. 1 positioning base (5), the No. 2 positioning base (6), the No. 3 positioning base (7) and the No. 4 positioning base (8) extend upward to form two side limit plates (a), and the clamping block (9) is placed between the two side limit plates (a), and the clamping block (9) is connected to the No. 1 positioning base (5), the No. 2 positioning base (6), the No. 3 positioning base (7) and the No. 4 positioning base (8) through a clamping stud (10).

4. The positioning tool for valve body machining according to claim 3, characterized in that: A clamping guide column (111) is provided between the two side limit plates (a), and a guide hole (91) is provided on the clamping block (9) for the clamping guide column (111) to pass through.

5. A positioning method for a positioning tool for valve body machining according to any one of claims 1 to 4, characterized in that: First, the two No. 2 positioning bosses (3) and one No. 1 positioning boss (2) are positioned using the three-point coplanarity principle: the first fixed support platform (61) on the No. 2 positioning base (6) supports one No. 1 positioning boss (2), the floating support column (71) on the No. 3 positioning base (7) and the positioning pin (82) on the No. 4 positioning base (8) are respectively inserted into the positioning inner groove holes (31) on the bottom surfaces of the two No. 2 positioning bosses (3) to limit the horizontal movement of the valve body, and the second fixed support platform (81) supports one of the No. 2 positioning bosses (3); Then, the adjustable support column (51) is manually adjusted so that the adjustable support column (51) supports another No. 1 positioning boss (2). After the adjustment is in place, the contact surface between the adjustable support column (51) and the No. 1 positioning boss (2), the contact surface between the first fixed support platform (61) and the No. 1 positioning boss (2), the contact surface between the second fixed support platform (81) and the No. 2 positioning boss (3), and the contact surface between the floating support column (71) and the No. 2 positioning boss (3) are located in the same plane; Finally, each positioning boss is clamped in the vertical direction using a clamping block (9) to complete the positioning.

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