Single-tooth low-pressure turbine working blade crown end face grinding machining clamping device

Abstract

The utility model relates to the technical field of aero-engine turbine blade manufacturing, in particular to a single-tooth low-pressure turbine working blade crown end face grinding machining clamping device which comprises a base, and a first wedge-shaped positioning assembly and a second wedge-shaped positioning assembly are fixedly arranged on the upper surface of the base. A first pressing plate assembly used for pressing one end of a blade on the first wedge-shaped positioning assembly is fixedly arranged on the upper surface of the base, and a second pressing plate assembly used for pressing the other end of the blade on the second wedge-shaped positioning assembly is fixedly arranged on the upper surface of the base. The first pressing plate assembly and the second pressing plate assembly are located on the same side of a connecting line of the first wedge-shaped positioning assembly and the second wedge-shaped positioning assembly. A positioning ball assembly is arranged on the side edge of the connecting line of the first pressing plate assembly and the second pressing plate assembly. The clamping device is simple in structure, simple in clamping operation and stable in clamping, and the clamping process is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to aero -engine turbine blade manufacturing technical field especially relates to a single tooth low pressure turbine working blade shroud end face grinding clamping device. BACKGROUND

[0002] Aero -engine turbine working blade is mostly difficult processing material, especially slender thin blade structure, decide its in the processing process extremely easy to produce deformation. Because blade thickness is thin, cutting force, cutting heat and clamping mode and other factors can have significant influence on the shape and dimensional accuracy of blade. The machining accuracy of blade directly influences the performance and life of turbine machinery. Therefore, the machining accuracy of blade is extremely high, including dimensional accuracy, shape accuracy and position accuracy. Especially for slender thin blade, clamping mode is particularly important, and unreasonable clamping mode can lead to vibration or deformation of blade in the processing process, thereby affecting the machining accuracy. SUMMARY

[0003] The utility model solves the technical problem that a single tooth low pressure turbine working blade shroud end face grinding clamping device is provided, and direct and economic grinding of the shroud end face of the slender thin low pressure turbine working blade is realized.

[0004] The utility model discloses a single tooth low pressure turbine working blade shroud end face grinding clamping device, including the base, the upper surface of base is fixed with first wedge shape positioning assembly and second wedge shape positioning assembly, first wedge shape positioning assembly with second wedge shape positioning assembly is along the length direction interval of base arrangement, the upper surface of base is fixed with the first pressure plate component for the one end of blade pressure equipment on first wedge shape positioning assembly, the upper surface of base is fixed with the second pressure plate component for the other end of blade pressure equipment on second wedge shape positioning assembly, first pressure plate component with second pressure plate component are located the same side of the line of first wedge shape positioning assembly and second wedge shape positioning assembly, the side of the line of first wedge shape positioning assembly and first pressure plate component is equipped with positioning ball component.

[0005] The utility model has the advantages of simple structure, simple clamping operation, stable clamping and simplified clamping process.

[0006] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0007] Further, the first wedge shape positioning assembly includes a first positioning seat fixed on the base, a first wedge shape positioning block is fixed on the upper surface of the first positioning seat, and a first positioning groove is arranged on the side surface of the first wedge shape positioning block facing the first pressure plate component.

[0008] The beneficial effect of the further scheme is that the first positioning groove is arranged on the first wedge-shaped positioning block, and when clamping the blade, one end of the blade is clamped in the first positioning groove by the first pressing plate assembly, the first positioning groove is used for multi-point positioning of the one end of the blade, and then the first pressing plate assembly is used for clamping, so that the one end of the blade is clamped stably.

[0009] Further, the first pressing plate assembly comprises a first pressing base fixed on the base, the first pressing base is arranged at intervals with the first positioning seat, a first support is fixed on one end of the first pressing base away from the first positioning seat, a first pressing bolt is threadedly connected on the first support, a first pressing plate is rotationally connected on one end of the first pressing bolt facing the first wedge-shaped positioning block, and the first pressing plate is driven by the first pressing bolt to approach or move away from the first positioning groove.

[0010] The beneficial effect of the further scheme is that the first pressing plate is driven to move along the axial direction of the first pressing bolt by rotating the first pressing bolt, so that the first pressing plate approaches or moves away from the first positioning groove, and then the one end of the blade is clamped by the first pressing plate and the first positioning groove.

[0011] Further, the first pressing plate comprises a first bottom plate, a first upper pressing plate and a first lower pressing plate, the first upper pressing plate and the first lower pressing plate are respectively fixedly connected with the upper and lower ends of one side of the first bottom plate facing the first wedge-shaped positioning block, the first pressing bolt is rotationally connected with the first bottom plate, two first nuts are threadedly connected on the first pressing bolt, and the two first nuts are respectively arranged on the two sides of the first bottom plate.

[0012] The beneficial effect of the further scheme is that the first pressing plate realizes two-point pressing of the blade through the first upper pressing plate and the first lower pressing plate, multi-point positioning and clamping of the blade are realized under the cooperation of the first positioning groove, and the stability of clamping the blade is ensured.

[0013] Further, two first guide seats are fixedly arranged on the first pressing base, the two first guide seats are arranged at intervals on the first pressing base along the length direction of the base, and the first pressing plate is slidingly arranged between the two first guide seats.

[0014] The beneficial effect of the further scheme is that the first guide seat can guide the movement of the first pressing plate, and avoid rotating the first pressing plate during the rotation of the first pressing bolt.

[0015] Further, the second wedge-shaped positioning assembly comprises a second positioning seat fixed on the base, and a second wedge-shaped positioning block is fixed on the upper surface of the second positioning seat, and a second positioning groove is arranged on the side surface of the second wedge-shaped positioning block facing the second pressing plate assembly.

[0016] The beneficial effect of the above further scheme is that, by arranging the second positioning groove on the second wedge-shaped positioning block, when clamping the blade, one end of the blade is clamped in the second positioning groove by the second pressing plate assembly, and the blade end is positioned by the second positioning groove, and then the second pressing plate assembly is pressed to ensure the stable clamping of the blade end.

[0017] Further, the second pressing plate assembly comprises a second pressing seat fixed on the base, and the second pressing seat is arranged in a spaced manner with the second positioning seat, and a second support is fixed on the end of the second pressing seat away from the second positioning seat, and a second pressing bolt is threadedly connected to the second support, and the end of the second pressing bolt facing the second wedge-shaped positioning block is arranged in an upward inclined manner, and a second pressing plate is rotatably connected to the end of the second pressing bolt facing the second wedge-shaped positioning block, and the second pressing plate is driven by the second pressing bolt to approach or move away from the second positioning groove.

[0018] The beneficial effect of the above further scheme is that, by rotating the second pressing bolt, the second pressing plate is driven to move along the axial direction of the second pressing bolt, so that the second pressing plate approaches or moves away from the first positioning groove, and then the blade end is clamped by the second pressing plate and the second positioning groove.

[0019] Further, the second pressing plate comprises a second bottom plate, a second upper pressing plate and a second lower pressing plate, the second upper pressing plate and the second lower pressing plate are respectively fixedly connected to the upper and lower ends of the side of the second bottom plate facing the second wedge-shaped positioning block, the second pressing bolt is rotatably connected to the second bottom plate, two second nuts are threadedly connected to the second pressing bolt, and the two second nuts are respectively arranged on the two sides of the second bottom plate.

[0020] The beneficial effect of the above further scheme is that, by arranging the second positioning groove on the second wedge-shaped positioning block, when clamping the blade, one end of the blade is clamped in the second positioning groove by the second pressing plate assembly, and the blade end is positioned by the second positioning groove, and then the second pressing plate assembly is pressed to ensure the stable clamping of the blade end.

[0021] Further, two second guide seats are fixed on the second positioning seat, the two second guide seats are arranged in a spaced manner on the second positioning seat along the length direction of the base, the two second guide seats are arranged in a spaced manner with the groove bottom of the second positioning groove, and the second pressing plate is slidingly arranged between the two second guide seats.

[0022] The beneficial effect of the further scheme is that the second guide seat can guide the movement of the second pressing plate, avoiding the second pressing plate from rotating during the rotation of the second pressing bolt.

[0023] Further, the positioning ball assembly comprises a third support, and a ball head cylindrical positioning pin is installed on the side of the line connecting the first wedge-shaped positioning assembly and the first pressing plate assembly.

[0024] The beneficial effect of the further scheme is that the ball head cylindrical positioning pin can press and position the side of one end of the blade. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a top view of the utility model;

[0026] Figure 2 is a front view of the utility model;

[0027] Figure 3 is an installation schematic view of the first wedge-shaped positioning assembly and the first pressing plate assembly in the utility model;

[0028] Figure 4 is an installation schematic view of the second wedge-shaped positioning assembly and the second pressing plate assembly in the utility model;

[0029] In the drawings, the components represented by each reference numeral are listed as follows:

[0030] 1, base;

[0031] 2, first wedge-shaped positioning assembly; 21, first positioning seat; 22, first wedge-shaped positioning block; 23, first positioning groove;

[0032] 3, second wedge-shaped positioning assembly; 31, second positioning seat; 32, second wedge-shaped positioning block; 33, second positioning groove; 34, second guide seat;

[0033] 4, first pressing plate assembly; 41, first pressing seat; 42, first support; 43, first pressing bolt; 44, first pressing plate; 441, first bottom plate; 442, first upper pressing plate; 443, first lower pressing plate; 45, first nut; 46, first guide seat;

[0034] 5, second pressing plate assembly; 51, second pressing seat; 52, second support; 53, second pressing bolt; 54, second pressing plate; 541, second bottom plate; 542, second upper pressing plate; 543, second lower pressing plate; 55, second nut;

[0035] 6, positioning ball assembly; 61, third support; 62, ball head cylindrical positioning pin. DETAILED DESCRIPTION

[0036] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an embodiment of this utility model includes a base 1. A first wedge-shaped positioning component 2 and a second wedge-shaped positioning component 3 are fixedly disposed on the upper surface of the base 1. The first wedge-shaped positioning component 2 and the second wedge-shaped positioning component 3 are spaced apart along the length direction of the base 1. A first pressure plate component 4 for pressing one end of a blade onto the first wedge-shaped positioning component 2 is fixedly disposed on the upper surface of the base 1. A second pressure plate component 5 for pressing the other end of a blade onto the second wedge-shaped positioning component 3 is fixedly disposed on the upper surface of the base 1. The first pressure plate component 4 and the second pressure plate component 5 are located on the same side of the line connecting the first wedge-shaped positioning component 2 and the second wedge-shaped positioning component 3. A positioning ball component 6 is disposed on the side of the line connecting the first wedge-shaped positioning component 2 and the first pressure plate component 4.

[0038] like Figure 3 As shown in the embodiment of this utility model, the first wedge positioning component 2 includes a first positioning seat 21, which is fixed on the base 1. Specifically, the first positioning seat 21 is positioned and installed on the base 1 by screws and pins. A first wedge positioning block 22 is fixed on the upper surface of the first positioning seat 21. A first positioning groove 23 is provided on the side of the first wedge positioning block 22 facing the first pressure plate component 4. In this embodiment, the first positioning groove 23 penetrates the top, left and right sides and the side of the first wedge positioning block 22 facing the first pressure plate component 4. The first positioning groove 23 includes a horizontal sidewall and an inclined sidewall, so that the first positioning groove 23 positions and clamps at least two points of the blade.

[0039] Specifically, the first pressure plate assembly 4 includes a first pressure seat 41, which is fixed on the base 1. The first pressure seat 41 and the first positioning seat 21 are spaced apart in the width direction of the base 1. A first support 42 is fixedly provided on the end of the first pressure seat 41 away from the first positioning seat 21. The first support 42 is integrally fixedly connected to the first pressure seat 41. A first clamping bolt 43 is threadedly connected to the first support 42. A first pressure plate 44 is rotatably connected to the end of the first clamping bolt 43 facing the first wedge-shaped positioning block 22. The first pressure plate 44 moves closer to or away from the first positioning groove 23 under the action of the first clamping bolt 43.

[0040] By setting the first positioning groove 23 on the first wedge-shaped positioning block 22, when clamping the blade, one end of the blade is clamped in the first positioning groove 23 by the first pressing plate assembly 4, and the first positioning groove 23 realizes multi-point positioning of the one end of the blade, and then the first pressing plate assembly 4 is pressed to ensure stable clamping of the one end of the blade. By rotating the first pressing bolt 43, the first pressing plate 44 is driven to move along the axial direction of the first pressing bolt 43, so that the first pressing plate 44 approaches or moves away from the first positioning groove 23, thereby realizing clamping of the one end of the blade by the first pressing plate 44 and the first positioning groove 23.

[0041] In the preferred embodiment of the utility model, the first pressing plate 44 includes a first bottom plate 441, a first upper pressing plate 442 and a first lower pressing plate 443. The first upper pressing plate 442 and the first lower pressing plate 443 are respectively fixedly connected with the upper and lower ends of one side of the first bottom plate 441 facing the first wedge-shaped positioning block 22. The first upper pressing plate 442 and the first lower pressing plate 443 are arranged at a certain angle with the first bottom plate 441. The first pressing bolt 43 is rotationally connected with the first bottom plate 441. Two first nuts 45 are threadedly connected with the first pressing bolt 43, and the two first nuts 45 are respectively arranged on the two sides of the first bottom plate 441. The first pressing plate 44 realizes two-point pressing of the blade through the first upper pressing plate 442 and the first lower pressing plate 443. Under the cooperation of the first positioning groove 23, multi-point positioning and clamping of the blade are realized, and the stability of clamping the blade is ensured.

[0042] Further preferably, two first guide seats 46 are fixedly arranged on the first pressing seat 41. The first guide seats 46 are integrally fixedly connected with the first pressing seat 41. The two first guide seats 46 are arranged on the first pressing seat 41 along the length direction of the base 1. The first pressing plate 44 is slidingly arranged between the two first guide seats 46. The arrangement of the first guide seats 46 can guide the movement of the first pressing plate 44 and avoid rotating the first pressing plate 44 during the rotation of the first pressing bolt 43.

[0043] As Figure 4As shown, in the embodiment of the utility model, the second wedge positioning assembly 3 includes second positioning seat 31, second positioning seat 31 is fixed on base 1, the upper surface of second positioning seat 31 is fixed with second wedge positioning block 32, the side of second wedge positioning block 32 towards second pressing plate assembly 5 is equipped with second positioning groove 33, in this embodiment, second positioning groove 33 is the top and left and right sides of second wedge positioning block 32 and its side towards second pressing plate assembly 5 are penetrated, and second positioning groove 33 includes two oblique sides arranged at a certain angle, so that the first positioning groove 23 positions and clamps at least two points of the blade. By setting second positioning groove 33 on second wedge positioning block 32, when clamping the blade, one end of the blade is clamped in second positioning groove 33 by second pressing plate assembly 5, and multiple-point positioning of one end of the blade is realized by second positioning groove 33, then clamping is ensured by second pressing plate assembly 5, and stable clamping of one end of the blade is ensured.

[0044] Preferably, the second pressing plate assembly 5 includes a second pressing seat 51, the second pressing seat 51 is spaced apart from the second positioning seat 31, a second support 52 is fixedly arranged on one end of the second pressing seat 51 away from the second positioning seat 31, a second pressing bolt 53 is threadedly connected to the second support 52, one end of the second pressing bolt 53 towards the second wedge positioning block 32 is arranged obliquely upwards, a second pressing plate 54 is rotatably connected to one end of the second pressing bolt 53 towards the second wedge positioning block 32, and the second pressing plate 54 is driven by the second pressing bolt 53 to move towards or away from the second positioning groove 33. By rotating the second pressing bolt 53, the second pressing plate 54 is driven to move along the axial direction of the second pressing bolt 53, so that the second pressing plate is moved towards or away from the first positioning groove 23, and then the end of the blade is clamped by the second pressing plate 54 and the second positioning groove 33.

[0045] In the preferred embodiment, the second pressing plate 54 includes a second bottom plate 541, a second upper pressing plate 542 and a second lower pressing plate 543, the second upper pressing plate 542 and the second lower pressing plate 543 are respectively fixedly connected to the upper and lower ends of one side of the second bottom plate 541 towards the second wedge positioning block 32, the second pressing bolt 53 is rotatably connected to the second bottom plate 541, two second nuts 55 are threadedly connected to the second pressing bolt 53, and the two second nuts 55 are respectively arranged on the two sides of the second bottom plate 541. The second pressing plate 54 realizes two-point pressing of the blade by the second upper pressing plate 542 and the second lower pressing plate 543, realizes multiple-point positioning and clamping of the blade under the cooperation of the second positioning groove 33, and ensures the stability of clamping one end of the blade.

[0046] The second positioning seat 31 is fixed with two second guide seats 34, the two second guide seats 34 are arranged on the second positioning seat 31 along the length direction of the base 1 and are arranged at intervals with the groove bottom of the second positioning groove 33, and the second pressing plate 54 is slidably arranged between the two second guide seats 34. The arrangement of the second guide seat 34 can guide the movement of the second pressing plate 54, so that the second pressing plate 54 is prevented from rotating during the rotation of the second pressing bolt 53.

[0047] In the embodiment of the utility model, the positioning ball assembly 6 includes a third support 61, a ball head cylindrical positioning pin 62 is installed on the side of the connecting line of the first wedge positioning assembly 2 and the first pressing plate assembly 4, and the ball head cylindrical positioning pin 62 can press and position the side of one end of the blade.

[0048] In the description of the utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the system or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0049] In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0050] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0051] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0052] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A single-tooth low-pressure turbine blade shroud end face grinding processing clamping device, characterized in that, The utility model provides a blade positioning device, including base (1), first wedge positioning assembly (2) and second wedge positioning assembly (3) are fixedly arranged on the upper surface of base (1), first wedge positioning assembly (2) and second wedge positioning assembly (3) are spaced apart along the length direction of base (1), first wedge positioning assembly (2) and second wedge positioning assembly (3) are fixedly arranged on the upper surface of base (1) and are used to press fit the one end of blade on first wedge positioning assembly (2), second wedge positioning assembly (3) is fixedly arranged on the upper surface of base (1) and is used to press fit the other end of blade on second wedge positioning assembly (3), first wedge positioning assembly (2) and second wedge positioning assembly (3) are located on the same side of the line of first wedge positioning assembly (2) and second wedge positioning assembly (3), and the side of the line of first wedge positioning assembly (2) and first wedge positioning assembly (4) is provided with positioning ball assembly (6).

2. The single-tooth low-pressure turbine blade shroud end face grinding clamping device according to claim 1, characterized in that, First positioning seat (21) is fixed on base (1), first positioning seat (21) is fixedly provided with first wedge positioning block (22) on the upper surface, and first wedge positioning block (22) is provided with first positioning groove (23) on the side of first wedge positioning block (22) towards first wedge positioning block (22).

3. The single tooth low pressure turbine blade shroud end face grinding clamping device according to claim 2, characterized in that, First pressure seat (41) is spaced apart from first positioning seat (21), first pressure seat (41) is fixed on base (1), first pressure seat (41) is fixedly provided with first support (42) on the end away from first positioning seat (21), first support (42) is threadedly connected with first pressing bolt (43) on first support (42), one end of first pressing bolt (43) towards first wedge positioning block (22) is rotatably connected with first pressing plate (44), and first pressing plate (44) is driven by first pressing bolt (43) to be close to or away from first positioning groove (23).

4. The single tooth low pressure turbine blade shroud end face grinding clamping device according to claim 3, characterized in that, First pressing plate (44) includes first bottom plate (441), first upper pressing plate (442) and first lower pressing plate (443), first upper pressing plate (442) and first lower pressing plate (443) are fixedly connected with the upper and lower ends of the side of first bottom plate (441) towards first wedge positioning block (22) respectively, first pressing bolt (43) is rotatably connected with first bottom plate (441), and two first nuts (45) are threadedly connected on first pressing bolt (43), and two first nuts (45) are arranged on the two sides of first bottom plate (441) respectively.

5. The single tooth low pressure turbine blade shroud end face grinding clamping device according to claim 3, characterized in that, First pressure seat (41) is fixedly provided with two first guide seats (46), two first guide seats (46) are spaced apart on first pressure seat (41) along the length direction of base (1), and first pressing plate (44) is slidably arranged between two first guide seats (46).

6. The single tooth low pressure turbine blade shroud end face grinding clamping device according to claim 1, characterized in that, The second wedge positioning assembly (3) comprises a second positioning seat (31) fixed on the base (1), and a second wedge positioning block (32) is fixed on the upper surface of the second positioning seat (31), and the second wedge positioning block (32) is provided with a second positioning groove (33) on the side surface facing the second pressing plate assembly (5).

7. The single tooth low pressure turbine blade shroud end face grinding processing clamping device according to claim 6, characterized in that, The second pressing plate assembly (5) comprises a second pressing seat (51) fixed on the base (1), and the second pressing seat (51) is arranged at intervals with the second positioning seat (31), and a second support (52) is fixed on the end of the second pressing seat (51) away from the second positioning seat (31), and a second pressing bolt (53) is threadedly connected to the second support (52), and the end of the second pressing bolt (53) facing the second wedge positioning block (32) is arranged upwardly and obliquely, and a second pressing plate (54) is rotatably connected to the end of the second pressing bolt (53) facing the second wedge positioning block (32), and the second pressing plate (54) is driven by the second pressing bolt (53) to approach or move away from the second positioning groove (33).

8. The single tooth low pressure turbine blade shroud end face grinding processing clamping device according to claim 7, characterized in that, The second pressing plate (54) comprises a second bottom plate (541), a second upper pressing plate (542) and a second lower pressing plate (543), the second upper pressing plate (542) and the second lower pressing plate (543) are respectively fixedly connected to the upper and lower ends of the side of the second bottom plate (541) facing the second wedge positioning block (32), the second pressing bolt (53) is rotatably connected to the second bottom plate (541), and two second nuts (55) are threadedly connected to the second pressing bolt (53), and the two second nuts (55) are respectively arranged on the two sides of the second bottom plate (541).

9. The single tooth low pressure turbine blade shroud end face grinding processing clamping device according to claim 7, characterized in that, The second positioning seat (31) is fixedly provided with two second guide seats (34), the two second guide seats (34) are arranged at intervals on the second positioning seat (31) along the length direction of the base (1), the two second guide seats (34) are arranged at intervals with the groove bottom of the second positioning groove (33), and the second pressing plate (54) is slidingly arranged between the two second guide seats (34).

10. The clamping device for grinding the end face of a shroud of a single- tooth low-pressure turbine working blade according to any one of claims 1 to 9, characterized in that, The positioning ball assembly (6) comprises a third support (61), and a ball head cylindrical positioning pin (62) is installed on the side edge of the connecting line of the first wedge positioning assembly (2) and the first pressing plate assembly (4).

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