Positioning clamp device for finish-milling machining of appearance of cartridge receiver

Abstract

The utility model discloses a locating fixture device for casing appearance finish milling, which comprises a fixture base, a fixture disc group, a fixture stand column group and a fixture locating block group, the fixture disc group comprises a first fixture disc, a second fixture disc and a third fixture disc, and the fixture stand column group comprises a first fixture stand column and a second fixture stand column. The clamp positioning block set comprises a first clamp positioning block, a second clamp positioning block and a third clamp positioning block. The clamp base is fixedly connected with the bottom of the first clamp disc, the first clamp positioning block and the second clamp positioning block are installed on the first clamp disc, the end of the first clamp stand column is connected with the first clamp disc, the other end of the first clamp stand column is connected with the bottom of the second clamp disc, and the end of the second clamp stand column is connected with the third clamp disc. A case part to be machined is installed between the first clamp disc and the third clamp disc and is positioned and clamped through the first clamp positioning block, the second clamp positioning block and the third clamp positioning block.

Description

Technical Field

[0001] The utility model belongs to the technical field of casing processing fixtures, and in particular relates to a positioning fixture device used for fine milling of casing appearance. Background Art

[0002] With the rapid development of my country's aviation industry, especially in the key manufacturing technology of advanced aircraft engines, the production and processing of engine casings has become increasingly important. The quality of casing production and processing often plays an important role in engine performance, and thus determines the performance and level of the engine to a certain extent. In the production and processing of casing parts, it is necessary to form the outer surface of the casing parts. The existing processing method is often to clamp the casing parts by existing fixture equipment, and then complete the milling of the casing parts' shape by milling machine equipment. However, the existing clamping equipment clamps the casing parts along the axial direction by means of claws, and the clamping position is relatively specific. In the process of milling the casing parts' shape, the existing claws will cause interference, thereby affecting the processing process of the casing parts' shape.

[0003] Especially in the process of processing precision receiver parts, it is necessary to position the receiver parts circumferentially so as to complete the stable clamping of the receiver parts. The clamping force of traditional positioning and clamping equipment is difficult to control. If the clamping force is too large, it is easy to damage the receiver parts. If the clamping force is too small, the stability of the receiver parts during processing will deteriorate. In the process of processing the shape of the receiver parts, since the shape of the receiver parts is the processing surface, it is necessary to clamp and position the inside of the parts. Since the processing accuracy of the receiver parts is relatively high, it is often necessary to achieve circumferential positioning at different positions inside the receiver parts. The existing fixture equipment can only clamp and position some positions in the axial direction of the receiver parts, and the final clamping and positioning effect is poor, which in turn affects the milling accuracy of the receiver parts. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problems and provide a positioning fixture device which is simple in structure, easy to use, and can achieve precise clamping and positioning of the inside and bottom of parts through mutually parallel disc structures and is used for fine milling of the casing shape.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a positioning fixture device for fine milling of casing shape, comprising a fixture base, a fixture disc group, a fixture column group and a fixture positioning block group, the fixture disc group comprises a first fixture disc, a second fixture disc and a third fixture disc, the first fixture disc, the second fixture disc and the third fixture disc are arranged parallel to each other, the fixture column group comprises a first fixture column and a second fixture column, the fixture positioning block group comprises a first fixture positioning block, a second fixture positioning block and a third fixture positioning block; the fixture The base is fixedly connected to the bottom of the first plate of the fixture, the first positioning block of the fixture and the second positioning block of the fixture are installed on the first plate of the fixture, the end of the first column of the fixture is connected to the first plate of the fixture, and the other end of the first column of the fixture is connected to the bottom of the second plate of the fixture, the second column of the fixture and the third positioning block of the fixture are both installed on the second plate of the fixture, and the end of the second column of the fixture is connected to the third plate of the fixture; the parts to be processed are installed between the first plate of the fixture and the third plate of the fixture, and are positioned and clamped by the first positioning block of the fixture, the second positioning block of the fixture and the third positioning block of the fixture respectively.

[0006] Preferably, the clamp base includes a first base plate, a second base plate and a base connecting block, the first base plate and the second base plate are both circular ring structures and are coaxial, the first base plate and the second base plate are connected through the base connecting block, the first clamp plate and the second base plate are connected through bolts, and the first base plate is provided with a first base plate groove and a first base plate through hole, and the first base plate through hole is located in the first base plate groove.

[0007] Preferably, a base second plate groove and a base second plate through hole are provided on the end surface of the base second plate, and the base second plate through hole is located in the base second plate groove.

[0008] Preferably, the cross-section of the base connecting block is a trapezoidal structure, and a first base connecting block hole and a second base connecting block hole are provided on the base connecting block, and both the first base connecting block hole and the second base connecting block hole are through-hole structures.

[0009] Preferably, a first-disk groove is provided on the upper end surface of the first disk of the fixture, and the bottom of the part to be processed is located in the first-disk groove of the fixture; a first-disk connecting hole, a second connecting hole, a third connecting hole, a first-disk positioning hole and a second positioning hole are provided on the first disk of the fixture, the first connecting hole of the first disk of the fixture is a through hole structure, the second connecting hole of the first disk of the fixture is a countersunk through hole structure, the third connecting hole of the first disk of the fixture, the first positioning hole of the first disk of the fixture and the second positioning hole of the first disk of the fixture are all threaded holes, the first positioning block of the fixture is located on the first positioning hole of the first disk of the fixture and is connected by bolts, and the second positioning block of the fixture is located on the second positioning hole of the first disk of the fixture and is connected by bolts.

[0010] Preferably, the first positioning block of the clamp is a rectangular block structure, the end of the first positioning block of the clamp is a trapezoidal structure, the first positioning block of the clamp is provided with a first hole of the first positioning block of the clamp and a second hole of the first positioning block of the clamp, and the second hole of the first positioning block of the clamp is a waist-shaped hole structure; the second positioning block of the clamp and the third positioning block of the clamp have the same structure as the first positioning block of the clamp.

[0011] Preferably, the second plate of the clamp is a circular ring structure, and is provided with a first hole of the second plate of the clamp and a second hole of the second plate of the clamp. The first hole of the second plate of the clamp is a through hole structure, and the second hole of the second plate of the clamp is a threaded hole structure.

[0012] Preferably, a first column connecting shaft of the clamp is provided at the bottom end of the first column of the clamp, and the first column connecting shaft of the clamp is an external thread structure. The top cross-section of the first column of the clamp is a regular hexagonal structure. A first column connecting hole of the clamp is provided on the top surface of the first column of the clamp, and the first column connecting hole of the clamp is a threaded hole structure. The structure of the second column of the clamp is the same as that of the first column of the clamp.

[0013] Preferably, the third plate of the clamp is a circular ring structure, and a third plate connecting hole of the clamp is provided on the third plate of the clamp, and the third plate connecting hole of the clamp is a through hole structure.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model provides a positioning fixture device for fine milling of a casing shape, which completes the top positioning of the casing parts through the third plate of the fixture, and can complete the circumferential positioning of the top of the casing parts.

[0016] 2. The utility model realizes circumferential positioning of the interior of the receiver parts by means of a plurality of first positioning blocks of the clamp installed on the first plate of the clamp and the second plate of the clamp, thereby making the receiver parts more stable.

[0017] 3. The utility model can be connected to more existing equipment through the clamp base, thereby increasing the scope of use and enhancing practicality.

[0018] 4. The bottom of the receiver part of the utility model is positioned by the groove of the first plate of the clamp, so that the bottom of the receiver part can be limited in the axial direction, thereby increasing the stability of the receiver part clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a positioning fixture device used for fine milling of casing shape according to the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the utility model after the parts to be processed are installed;

[0021] Figure 3 This is a top view of the fixture base of the utility model;

[0022] Figure 4 This is a bottom view of the fixture base of the utility model;

[0023] Figure 5 It is a schematic diagram of the lateral structure of the fixture base of the utility model;

[0024] Figure 6 This is a schematic diagram of the first plate structure of the clamp of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the first positioning block of the clamp of the utility model;

[0026] Figure 8 It is a structural schematic diagram of the second plate of the clamp of the utility model;

[0027] Fig. 9 It is a structural schematic diagram of the first column of the clamp of the utility model;

[0028] Fig.10 It is a schematic diagram of the connection between the first column of the clamp, the second column of the clamp and the second plate of the clamp of the utility model;

[0029] Fig.11 It is a structural schematic diagram of the third plate of the clamp of the utility model.

[0030] Explanation of reference numerals: 1. fixture base; 2. fixture plate group; 3. fixture column group; 4. fixture positioning block group; 11. first plate of base; 12. second plate of base; 13. base connecting block; 21. first plate of fixture; 22. second plate of fixture; 23. third plate of fixture; 31. first column of fixture; 32. second column of fixture; 41. first positioning block of fixture; 42. second positioning block of fixture; 43. third positioning block of fixture; 111. groove of first plate of base; 112. through hole of first plate of base; 121. groove of second plate of base; 122. through hole of second plate of base; 131. connecting block of base Block first hole; 132, base connecting block second hole; 210, clamp first plate groove; 211, clamp first plate first connecting hole; 212, clamp first plate second connecting hole; 213, clamp first plate third connecting hole; 214, clamp first plate first positioning hole; 215, clamp first plate second positioning hole; 221, clamp second plate first hole; 222, clamp second plate second hole; 231, clamp third plate connecting hole; 311, clamp first column connecting shaft; 312, clamp first column connecting hole; 411, clamp first positioning block first hole; 412, clamp first positioning block second hole. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0032] like Figures 1 to 11 As shown, the utility model provides a positioning fixture device for fine milling of a casing shape, comprising a fixture base 1, a fixture disc group 2, a fixture column group 3 and a fixture positioning block group 4, wherein the fixture disc group 2 comprises a first fixture disc 21, a second fixture disc 22 and a third fixture disc 23, and the first fixture disc 21, the second fixture disc 22 and the third fixture disc 23 are arranged parallel to each other, the fixture column group 3 comprises a first fixture column 31 and a second fixture column 32, and the fixture positioning block group 4 comprises a first fixture positioning block 41, a second fixture positioning block 42 and a third fixture positioning block 43. The fixture base 1 is fixedly connected to the bottom of the first fixture plate 21, the first fixture positioning block 41 and the second fixture positioning block 42 are installed on the first fixture plate 21, the end of the first fixture column 31 is connected to the first fixture plate 21, the other end of the first fixture column 31 is connected to the bottom of the second fixture plate 22, the second fixture column 32 and the third fixture positioning block 43 are both installed on the second fixture plate 22, and the end of the second fixture column 32 is connected to the third fixture plate 23. The receiver parts to be processed are installed between the first fixture plate 21 and the third fixture plate 23, and are positioned and clamped by the first fixture positioning block 41, the second fixture positioning block 42 and the third fixture positioning block 43 respectively.

[0033] like Figures 3 to 5 As shown, the clamp base 1 includes a first base plate 11, a second base plate 12 and a base connecting block 13, the first base plate 11 and the second base plate 12 are both circular ring structures and coaxial, the first base plate 11 and the second base plate 12 are connected through the base connecting block 13, the clamp first plate 21 is connected to the second base plate 12 through bolts, the first base plate 11 is provided with a first base plate groove 111 and a first base plate through hole 112, the first base plate through hole 112 is located in the first base plate groove 111.

[0034] A base second plate groove 121 and a base second plate through hole 122 are provided on the end surface of the base second plate 12 , and the base second plate through hole 122 is located in the base second plate groove 121 .

[0035] The cross section of the base connection block 13 is a trapezoidal structure, and the base connection block 13 is provided with a first base connection block hole 131 and a second base connection block hole 132, both of which are through-hole structures. Providing the first base connection block hole 131 and the second base connection block hole 132 can reduce the weight of the base connection block 13. The base connection blocks 13 are arranged and distributed in a circular pattern between the first base plate 11 and the second base plate 12.

[0036] In this embodiment, two base second plate through holes 122 are provided in each base second plate groove 121, and the base second plate grooves 121 are distributed in a circumferential array on the end surface of the base second plate 12. Bolts pass through the fixture connecting plate 2 and are threadedly connected to the base second plate through holes 122, thereby fixing the fixture connecting plate 2 to the fixture base 1. The fixture base 1 is fixedly connected to existing machine tools and the like. For example, the base first plate 11 and the base second plate 12 are sleeved on the rotating shaft of an existing machine tool and fixedly connected, thereby connecting the parts to the machine tool.

[0037] like Figure 6 As shown, the upper end surface of the first plate 21 of the clamp is provided with a first plate groove 210 of the clamp, and the bottom of the part to be processed is located in the first plate groove 210 of the clamp. The first plate 21 of the clamp is provided with a first connecting hole 211 of the first plate, a second connecting hole 212 of the first plate, a third connecting hole 213 of the first plate, a first positioning hole 214 of the first plate and a second positioning hole 215 of the first plate. The first connecting hole 211 of the first plate of the clamp is a through hole structure, the second connecting hole 212 of the first plate of the clamp is a countersunk through hole structure, the third connecting hole 213 of the first plate of the clamp, the first positioning hole 214 of the first plate of the clamp and the second positioning hole 215 of the first plate of the clamp are all threaded holes, the first positioning block 41 of the clamp is located on the first positioning hole 214 of the first plate of the clamp and connected by bolts, and the second positioning block 42 of the clamp is located on the second positioning hole 215 of the first plate of the clamp and connected by bolts.

[0038] In this embodiment, the first plate groove 210 of the fixture is circular, so that the bottom of the part to be processed can be positioned circumferentially, thereby increasing the stability of the fixture. The first positioning block 41 of the fixture and the second positioning block 42 of the fixture are respectively located on both sides of the first plate groove 210 of the fixture, and respectively abut against the inner and outer surfaces of the part, thereby completing the circumferential positioning of the inner wall of the end of the part.

[0039] The first positioning block 41 of the fixture is installed on the first positioning hole 214 of the first plate of the fixture and connected by bolts. By arranging multiple first positioning blocks 41 of the fixture in a circular array, the end of the first positioning block 41 of the fixture abuts against the part, which can realize the positioning of the unprocessed part at the bottom of the part, thereby increasing the stability of the part fixation. Compared with the traditional fixture fixing method of clamping the bottom of the part with claws, the utility model fixes the bottom of the part with a double method of groove and first positioning block, making the part more stable.

[0040] like Figure 7As shown, the first positioning block 41 of the clamp is a rectangular block structure, the end of the first positioning block 41 of the clamp is a trapezoidal structure, the first positioning block 41 of the clamp is provided with a first hole 411 of the clamp and a second hole 412 of the clamp, and the second hole 412 of the first positioning block of the clamp is a waist-shaped hole structure. The second positioning block 42 of the clamp and the third positioning block 43 of the clamp are both identical in structure to the first positioning block 41 of the clamp.

[0041] After the bolt passes through the second hole 412 of the first positioning block of the clamp, it is threadedly connected with the corresponding threaded hole, so that the end of the first positioning block 41 of the clamp can be abutted and fixed with the surface of the part at the most appropriate position. At the same time, since the second hole 412 of the first positioning block of the clamp is a waist-shaped hole structure, the position of the first positioning block 41 of the clamp can be fine-tuned according to the needs of use, so that the clamping and positioning of the part is more firm and stable, and the clamping of the part will not be damaged. In the process of milling the shape of the part, the quality and accuracy of the processing can be guaranteed.

[0042] like Figure 8 As shown, the second plate 22 of the clamp is a circular ring structure, and is provided with a first hole 221 and a second hole 222 of the clamp. The first hole 221 of the clamp is a through hole structure, and the second hole 222 of the clamp is a threaded hole structure.

[0043] The third positioning blocks 43 of the clamp are arranged in a circumferential array on the second hole 222 of the second plate of the clamp, and the third positioning blocks 43 of the clamp are connected to the second hole 222 of the second plate of the clamp by bolts. The end of the third positioning block 43 of the clamp abuts against the part, thereby completing the clamping and positioning of the part.

[0044] like Fig. 9 and Fig.10 As shown, the bottom end of the first column 31 of the clamp is provided with a first column connecting shaft 311 of the clamp, and the first column connecting shaft 311 of the clamp is an external thread structure. The top cross-section of the first column 31 of the clamp is a regular hexagonal structure. The top surface of the first column 31 of the clamp is provided with a first column connecting hole 312 of the clamp, and the first column connecting hole 312 of the clamp is a threaded hole structure. The structure of the second column 32 of the clamp is the same as that of the first column 31 of the clamp.

[0045] In this embodiment, the end of the second column 32 of the clamp passes through the first hole 221 of the second plate of the clamp and is threadedly connected to the first column 31 of the clamp. The upper end of the first column 31 of the clamp abuts against the second plate 22 of the clamp. The first column 31 of the clamp and the second column 32 of the clamp form a rod-shaped structure, which is arranged in a circular shape, and plays a role in supporting and connecting the first plate 21 of the clamp, the second plate 22 of the clamp and the third plate 23 of the clamp, thereby enhancing the stability of the entire clamp.

[0046] like Fig.11 As shown, the third plate 23 of the clamp is a circular ring structure, and a third plate connecting hole 231 of the clamp is provided on the third plate 23 of the clamp, and the third plate connecting hole 231 of the clamp is a through hole structure.

[0047] The bolt passes through the connecting hole 231 of the third plate of the clamp and is connected to the threaded hole at the end of the second column 32 of the clamp, thereby fixing the third plate 23 of the clamp and completing the positioning of the end of the part.

[0048] During use of the utility model, the receiver part to be processed is mounted on the first plate 21 of the fixture, the bottom of the receiver part is located in the groove 210 of the first plate of the fixture, and then the first positioning block 41 and the second positioning block 42 of the fixture, which are arranged in a circular array and opposite to each other, are abutted against the part, thereby completing the clamping and positioning of the bottom end of the receiver part. Then, the third positioning block 43 of the fixture, which is distributed in a circular array, is abutted against the inner surface of the receiver part, thereby positioning the middle part of the receiver part. Then, the third plate 23 of the fixture is abutted against the upper end of the receiver part, thereby completing the clamping and positioning of the other end of the part. Thus, the receiver part is stably clamped and positioned, which is convenient for the subsequent milling of the outer surface of the receiver part. Compared with the traditional clamping method of clamping a single point of the receiver parts or clamping the parts with claws, the utility model realizes multi-part positioning of the receiver parts by setting multiple clamp first positioning blocks 41, clamp second positioning blocks 42 and clamp third positioning blocks 43, and at the same time realizes the positioning of the two ends of the receiver parts by the clamp first plate 21 and the clamp third plate 23, so that the positioning and clamping of the receiver parts are more stable, which is suitable for the needs of high-precision receiver parts production and processing.

[0049] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspirations disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A positioning fixture device for fine milling of casing shape, characterized in that: The invention comprises a fixture base (1), a fixture plate group (2), a fixture column group (3) and a fixture positioning block group (4); the fixture plate group (2) comprises a first fixture plate (21), a second fixture plate (22) and a third fixture plate (23); the first fixture plate (21), the second fixture plate (22) and the third fixture plate (23) are arranged parallel to each other; the fixture column group (3) comprises a first fixture column (31) and a second fixture column (32); the fixture positioning block group (4) comprises a first fixture positioning block (41), a second fixture positioning block (42) and a third fixture positioning block (43); the fixture base (1) is fixedly connected to the bottom of the first fixture plate (21); the first fixture positioning block (41) is fixedly connected to the bottom of the first fixture plate (21); the first fixture positioning block (42) is fixedly connected to the bottom of the first fixture plate (21); the second fixture positioning block (42) is fixedly connected to the bottom of the first fixture plate (21); the first fixture positioning block (41 ... The block (41) and the second positioning block (42) of the fixture are installed on the first plate (21) of the fixture, the end of the first column (31) of the fixture is connected to the first plate (21) of the fixture, and the other end of the first column (31) of the fixture is connected to the bottom of the second plate (22) of the fixture. The second column (32) of the fixture and the third positioning block (43) of the fixture are both installed on the second plate (22) of the fixture, and the end of the second column (32) of the fixture is connected to the third plate (23) of the fixture; the casing parts to be processed are installed between the first plate (21) of the fixture and the third plate (23) of the fixture, and are positioned and clamped by the first positioning block (41) of the fixture, the second positioning block (42) of the fixture and the third positioning block (43) of the fixture respectively.

2. A positioning fixture device for fine milling of casing shape according to claim 1, characterized in that: The clamp base (1) comprises a first base plate (11), a second base plate (12) and a base connecting block (13); the first base plate (11) and the second base plate (12) are both circular ring structures and coaxial; the first base plate (11) and the second base plate (12) are connected via the base connecting block (13); the first clamp plate (21) and the second base plate (12) are connected via bolts; a first base plate groove (111) and a first base plate through hole (112) are provided on the first base plate (11); the first base plate through hole (112) is located in the first base plate groove (111).

3. A positioning fixture device for fine milling of casing shape according to claim 2, characterized in that: A base second plate groove (121) and a base second plate through hole (122) are provided on the end surface of the base second plate, and the base second plate through hole (122) is located in the base second plate groove (121).

4. A positioning fixture device for fine milling of casing shape according to claim 2, characterized in that: The cross section of the base connection block (13) is a trapezoidal structure. The base connection block (13) is provided with a first base connection block hole (131) and a second base connection block hole (132). Both the first base connection block hole (131) and the second base connection block hole (132) are through-hole structures.

5. A positioning fixture device for fine milling of casing shape according to claim 1, characterized in that: The upper end surface of the first plate (21) of the clamp is provided with a first plate groove (210), and the bottom of the part to be processed is located in the first plate groove (210); the first plate first connecting hole (211), the second connecting hole (212), the third connecting hole (213), the first plate first positioning hole (214) and the second positioning hole (215) of the first plate are provided on the first plate (21), and the first connecting hole (211) of the clamp is provided with a first connecting hole (212), the third connecting hole (213), the first plate first positioning hole (214) and the second positioning hole (215) of the first plate are provided on the first plate 11) is a through hole structure, the second connecting hole (212) of the first plate of the clamp is a countersunk through hole structure, the third connecting hole (213) of the first plate of the clamp, the first positioning hole (214) of the first plate of the clamp and the second positioning hole (215) of the first plate of the clamp are all threaded holes, the first positioning block (41) of the clamp is located on the first positioning hole (214) of the first plate of the clamp and is connected by bolts, and the second positioning block (42) of the clamp is located on the second positioning hole (215) of the first plate of the clamp and is connected by bolts.

6. A positioning fixture device for fine milling of casing shape according to claim 1, characterized in that: The first positioning block (41) of the clamp is a rectangular block structure, the end of the first positioning block (41) of the clamp is a trapezoidal structure, the first positioning block (41) of the clamp is provided with a first hole (411) of the clamp and a second hole (412) of the clamp, and the second hole (412) of the clamp is a waist-shaped hole structure; the second positioning block (42) of the clamp and the third positioning block (43) of the clamp are both of the same structure as the first positioning block (41) of the clamp.

7. A positioning fixture device for fine milling of casing shape according to claim 1, characterized in that: The second plate (22) of the clamp is a circular ring structure, and is provided with a first hole (221) of the second plate and a second hole (222) of the second plate. The first hole (221) of the second plate is a through hole structure, and the second hole (222) of the second plate is a threaded hole structure.

8. A positioning fixture device for fine milling of casing shape according to claim 1, characterized in that: The bottom end of the first column (31) of the clamp is provided with a first column connecting shaft (311), the first column connecting shaft (311) of the clamp is an external thread structure, the top cross-section of the first column (31) of the clamp is a regular hexagonal structure, the top surface of the first column (31) of the clamp is provided with a first column connecting hole (312), the first column connecting hole (312) of the clamp is a threaded hole structure, and the structure of the second column (32) of the clamp is the same as that of the first column (31).

9. A positioning fixture device for fine milling of casing shape according to claim 1, characterized in that: The third plate (23) of the clamp is a circular ring structure. The third plate (23) of the clamp is provided with a third plate connecting hole (231), and the third plate connecting hole (231) of the clamp is a through hole structure.

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