Low-cost two-stage guide wheel machining and positioning tool

Abstract

The low-cost two-stage guide wheel machining and positioning tool comprises a concave block and a concave-like block, the interior of the concave block is composed of a first inner surface and a first inner arc surface, the exterior of the concave block is composed of a first side face, a second side face and a third side face, the third side face is adjacent to and perpendicular to the first side face and the second side face, and the first side face is parallel to the second side face; the interior of the similar concave block is composed of a second inner surface and a second inner arc surface, the exterior of the similar concave block is composed of a fourth side face, a fifth side face, a sixth side face, a seventh side face and an eighth side face, the fourth side face is adjacent to the sixth side face, the fifth side face is adjacent to the seventh side face, the eighth side face is adjacent to the sixth side face and the seventh side face, the fourth side face is parallel to the fifth side face, and the eighth side face is perpendicular to the fourth side face and the fifth side face.

Description

TECHNICAL FIELD

[0001] The utility model relates to the processing positioning frock field of work piece, in particular to a low -cost two -stage guide wheel processing positioning frock. BACKGROUND

[0002] The downhole high -power turbine generator applied to some rotary steering system adopts the layout of two -stage turbine two -stage guide wheel to increase mud utilization rate, thereby outputting greater power.

[0003] The two -stage turbine is a turbine with upper and lower two groups of blades, and the two -stage guide wheel is a guide wheel with upper and lower two groups of blades, and the total length of the two -stage guide wheel is longer than that of the two -stage turbine. The two -stage turbine is cylindrical, and the two groups of blades are arranged on the upper and lower sides of the outer wall of the cylinder. The two -stage guide wheel is a concentric cylinder, the inner cylinder is short, and the outer cylinder is long (the length of the inner cylinder is only one third of the length of the outer cylinder), and the two groups of blades are arranged between the short inner cylinder and the long outer cylinder, and the other group is arranged in the middle section of the inner wall of the long outer cylinder.

[0004] When installing the two -stage turbine and the two -stage guide wheel in the generator, the turbine is installed first, and then the guide wheel short inner cylinder is installed above the turbine, so that the long outer cylinder of the guide wheel is wrapped outside the turbine, and the two groups of blades of the guide wheel are located above the two groups of blades of the turbine.

[0005] In order to realize the above installation, the two -stage guide wheel is designed as a two -piece combined structure: two identical semicylindrical guide wheel pieces are formed by being closed, one side of the guide wheel piece is provided with a trapezoidal ear, and the other side is provided with a trapezoidal groove; when closing, the short inner cylinder and the long outer cylinder of the two pieces are aligned, and the trapezoidal ear of each piece is inserted into the trapezoidal groove of the other piece to splice, thereby forming a complete guide wheel workpiece; in addition, the inner cylinder of the workpiece is provided with a boss on the upper end face, and the boss is provided with a locking ring, and the two pieces of the workpiece are fixed through the locking ring.

[0006] At present, the two -stage guide wheel is produced by "precision casting -machining": first, two semicylindrical guide wheel piece castings with trapezoidal ears (with excess margin on the edge) are obtained by precision casting; then the edge and the trapezoidal ear of the two guide wheel pieces are machined by wire cutting, and the trapezoidal groove of the two pieces is machined by electric spark; finally, the two pieces are closed and the inner cylinder is turned.

[0007] Because the guide wheel piece cannot be fixed on the machine tool, the above wire cutting and electric spark machining all need corresponding frock to fix the casting; and when turning, frock is needed to close and fix the two pieces together. In the prior art, three sets of machining fixing frocks are needed to meet the needs of wire cutting, electric spark and turning, and the production cost of the three sets of frocks is high, and it is not convenient to manage. SUMMARY

[0008] The utility model aims at providing a low -cost two -stage guide pulley processing positioning frock, including concave block and similar concave block, the inside of concave block is constituted by inner surface one and inner circular surface one, the outside is constituted by side one, side two and side three, wherein side three is adjacent with side one, two perpendicularly, side one is parallel with side two, the inside of similar concave block is constituted by inner surface two and inner circular surface two, the outside is constituted by side four, five, six, seven and eight, wherein side four is adjacent with side six, side five is adjacent with side seven, side eight is adjacent with side six, seven, and side four is parallel with side five, side eight is perpendicular with side four, five respectively.

[0009] Further, in the wire cutting and electric spark machining process of single-piece workpiece, the concave block is used as a fixing frock of the workpiece; the side three is a contact surface of the machine tool workbench.

[0010] Further, in the turning process of double-piece workpiece, the concave block and the similar concave block are combined and used as a whole; after combination, the side one and the side four, and the side two and the side five are spliced to form two large side surfaces parallel to each other; after combination, the inner circular surface one and the inner circular surface two form a complete inner cylindrical surface, which is a fixing surface of the workpiece.

[0011] Further, the side two is internally provided with a top pin hole one and a trapezoidal groove; the top pin hole one is provided with a top pin for clamping the single-piece workpiece; the trapezoidal groove is used for placing an electric discharge electrode in the electric spark machining to machine a trapezoidal groove of the single-piece workpiece.

[0012] Further, the side four and the side five are internally provided with a top pin hole two, which is provided with a top pin for clamping the workpiece to prevent radial movement.

[0013] Further, the side six and the side seven are provided with screw head holes, which extend inwardly to the inner surface two; the inner surface one is also provided with a screw hole, which corresponds to the position of the screw head hole, and is provided with a countersunk screw; the similar concave block is fixedly connected with the concave block through the countersunk screw.

[0014] The utility model has the advantages that in the wire cutting and electric spark machining process, the concave block in the utility model is used as a fixing frock of single-piece workpiece; in the turning process, the concave block and the similar concave block in the utility model are used as a positioning frock of the workpiece as a whole after combination, so that a set of frock can meet the positioning requirements of three processes, and the production cost can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model is a front isometric view of the two-stage guide pulley workpiece.

[0016] As shown in the figure: 1. Concave block; 2. Concave-like block; 101. Inner surface one; 102. Inner arc surface one; 103. Side surface one; 104. Side surface two; 105. Side surface three; 201. Inner surface two; 202. Inner arc surface two; 203. Side surface four; 204. Side surface five; 205. Side surface six; 206. Side surface seven; 207. Side surface eight; 208. Set screw hole one; 106. Set screw hole two; 107. Trapezoidal groove; 209. Countersunk screw. Detailed Implementation

[0017] Example 1

[0018] The present invention will be further described in conjunction with the accompanying drawings, such as... Figure 1 As shown, a low-cost dual-stage guide wheel machining positioning fixture includes a concave block 1 and a concave-like block 2. The interior of the concave block 1 is composed of an inner surface 101 and an inner arc surface 102, and the exterior is composed of side surface 103, side surface 204, and side surface 305. Side surface 305 is adjacent to and perpendicular to side surface 103 and side surface 204, respectively, and side surface 103 is parallel to side surface 204. The interior of the concave-like block 2 is composed of an inner surface 201 and an inner arc surface 202, and the exterior is composed of side surface 403, side surface 504, side surface 605, side surface 706, and side surface 807. Side surface 403 is adjacent to side surface 605, side surface 504 is adjacent to side surface 706, side surface 807 is adjacent to side surface 605 and side surface 706, and side surface 403 is parallel to side surface 504. Side surface 807 is perpendicular to side surface 403 and side surface 504, respectively.

[0019] Furthermore, in the wire cutting and electrical discharge machining process of a single workpiece, the concave block 1 is used alone as a workpiece fixing fixture; its side surface 105 is the contact surface of the machine tool worktable.

[0020] Furthermore, in the turning process of the double-piece mating workpiece, the concave block 1 and the concave block 2 are combined and used as a whole. After combination, side surface 103 and side surface 4 203, and side surface 2 104 and side surface 5 204 are respectively spliced ​​together to form two large side surfaces that are parallel to each other. After combination, inner arc surface 102 and inner arc surface 2 202 form a complete inner cylindrical surface, which is the workpiece fixing surface.

[0021] Furthermore, the side surface 104 has a set screw hole 106 and a trapezoidal groove 107. The set screw hole 106 is equipped with a set screw for clamping a single workpiece. The trapezoidal groove 107 is used to place a discharge electrode in electrical discharge machining to process the trapezoidal groove of the single workpiece.

[0022] Furthermore, the fourth side 203 and the fifth side 204 have a set screw hole 208, in which a set screw is installed. The set screw is used to tighten the workpiece to prevent it from moving radially.

[0023] Further, the side surfaces six 205, seven 206 are provided with screw head holes, which extend inwardly to the inner surface two 201; the inner surface one 101 is also provided with screw holes, which correspond to the positions of the screw head holes, and countersunk screws 209 are arranged in the screw holes, and the similar concave block 2 is fixedly connected with the concave block 1 through the countersunk screws 209.

[0024] Operation steps: One, single-piece workpiece wire cutting process: align the inner arc surface 102, put the workpiece into the concave block 1, and lock the top pin in the top pin hole one 106 to fix the workpiece, and then the wire cutting processing can be performed. Two, electric spark machining process: directly place the concave block 1 with the single-piece workpiece fixed therein in the working liquid tank, then place the electrode in the trapezoidal groove 107, and then the electric spark machining can be performed. Three, turning process: vertically abut the two single-piece workpieces which have completed the above two processes, then buckle the concave block 1 and the similar concave block 2 outside the workpiece, then lock the countersunk screws 209 to connect and fix the concave block 1 and the similar concave block 2, then lock the top pins in the top pin holes one and two to fix the workpiece, and then the inner circle turning processing of the workpiece can be performed.

Claims

1. A low-cost dual-stage guide wheel machining positioning fixture, comprising a concave block (1) and a quasi-concave block (2), wherein the interior of the concave block (1) is composed of an inner surface one (101) and an inner arc surface one (102), and the exterior is composed of a side surface one (103), a side surface two (104), and a side surface three (105), wherein side surface three (105) is adjacent to and perpendicular to side surface one (103) and side surface two (104) respectively, and side surface one (103) and side surface two (104) are parallel; the interior of the quasi-concave block (2) is composed of an inner surface two (20) 1) It is formed by the inner arc surface 2 (202) and the outside is formed by the side surface 4 (203), 5 (204), 6 (205), 7 (206) and 8 (207). Among them, side surface 4 (203) is adjacent to side surface 6 (205), side surface 5 (204) is adjacent to side surface 7 (206), side surface 8 (207) is adjacent to side surface 6 (205) and 7 (206), and side surface 4 (203) is parallel to side surface 5 (204), and side surface 8 (207) is perpendicular to side surface 4 (203) and side surface 5 (204) respectively.

2. The low-cost dual-stage guide wheel machining and positioning fixture according to claim 1, characterized in that, In the wire cutting and electrical discharge machining process of a single workpiece, the concave block (1) is used alone as a workpiece fixing fixture; its side surface three (105) is the contact surface of the machine tool table.

3. The low-cost two-stage guide wheel machining and positioning fixture according to claim 1, characterized in that, In the turning process of the double-piece mating workpiece, the concave block (1) and the concave block (2) are combined and used as a whole. After the combination, side one (103) and side four (203), side two (104) and side five (204) are spliced ​​together to form two large side surfaces that are parallel to each other. After the combination, inner arc surface one (102) and inner arc surface two (202) form a complete inner cylindrical surface, which is the workpiece fixing surface.

4. The low-cost two-stage guide wheel machining and positioning fixture according to claim 1, characterized in that, The second side (104) has a set screw hole (106) and a trapezoidal groove (107). The set screw hole (106) is equipped with a set screw for clamping a single workpiece. The trapezoidal groove (107) is used to place a discharge electrode in electrical discharge machining to process the trapezoidal groove of a single workpiece.

5. The low-cost two-stage guide wheel machining and positioning fixture according to claim 1, characterized in that, The fourth side (203) and the fifth side (204) have a set screw hole (208) with a set screw installed inside. The set screw is used to tighten the workpiece to prevent it from moving radially.

6. The low-cost two-stage guide wheel machining and positioning fixture according to claim 1, characterized in that, The sixth (205) and seventh (206) sides have screw head holes and extend inward to the second inner surface (201); the first inner surface (101) also has screw holes, the positions of which correspond to the screw head holes, and countersunk screws (209) are installed in them. The concave block (2) is fixedly connected to the concave block (1) by the countersunk screws (209).

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