Hydraulic cylinder finishing boring die

Abstract

The utility model relates to the field of finish machining technology, concretely is a hydraulic cylinder finish machining boring mould, it can conveniently realize the clamping of hydraulic cylinder, guarantees the machining accuracy, it includes boring mould body, is provided with the boss on the boring mould body, one side of boss is equipped with the concave step surface, is equipped with the hydraulic cylinder connecting hole for connecting on the boss, along the boring mould body center line, the boss and the step surface all are equipped with the positioning hole, and the positioning hole department on the step surface is provided with the cushion block, the boring mould body both sides are equipped with the clamping hole.

Description

Technical Field

[0001] This utility model relates to the field of precision machining technology, specifically a precision machining boring die for a hydraulic cylinder. Background Technology

[0002] See Figure 1-5 The hydraulic cylinder is a crucial component of the screw compressor main unit, used for continuous stepless adjustment of air volume to meet varying air volume requirements. Hydraulic cylinder precision machining refers to the final finishing of the important dimensional holes D1, D2, D3, D4 and planes P1, P2. From... Figure 1 The main view of the hydraulic cylinder shows that the holes D2, D3, D4 and planes P1, P2 have very high form and position tolerance requirements for the datum hole D1, making machining difficult. Structurally, this type of hydraulic cylinder is more suitable for lathe machining. Since there is currently no suitable finishing lathe, we are considering using an existing high-precision horizontal machining center to ensure the part's finishing requirements. The specific machining equipment is an Yasuda 15T125RP horizontal machining center. The part is 860mm long. If we machine from face G54 to face G56 and then remove the tool, it will be very difficult to ensure the consistency of the holes over such a long stroke of the horizontal machining center's Z-axis. Since the tolerance value of hole D1 is relatively large, we can consider boring hole D1 from two faces, with the tool insertion position in the middle, and the tool insertion error controlled within 0.01. This can ensure the machining accuracy of the part and give full play to the advantages of the horizontal machining center. The only drawback is the difficulty of clamping. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a hydraulic cylinder precision machining boring die, which can easily realize the clamping of the hydraulic cylinder and ensure machining accuracy.

[0004] The technical solution is as follows: a hydraulic cylinder precision machining boring die, characterized in that it includes a boring die body, a boss is provided on the boring die body, a recessed stepped surface is provided on one side of the boss, and a connecting hole for connecting a hydraulic cylinder is opened on the boss; positioning holes are opened along the center line of the boring die body on both the boss and the stepped surface, and a pad is provided at the positioning hole on the stepped surface; clamping holes are opened on both sides of the boring die body.

[0005] With this invention, a slotted headless screw is screwed onto the bottom of the hydraulic cylinder to align with the positioning hole for positioning. A pad is placed on the stepped surface to keep the hydraulic cylinder level. Then, the boring die and the hydraulic cylinder are connected and fixed by screws through the hydraulic cylinder connection hole, making clamping easier. Attached Figure Description

[0006] Figure 1 This is the front view of the hydraulic cylinder; Figure 2 Right view of the hydraulic cylinder; Figure 3 Left view of the hydraulic cylinder; Figure 4 Top view of the hydraulic cylinder; Figure 5 This is a bottom view of the hydraulic cylinder. Figure 6 This is a schematic diagram of the assembly of the hydraulic cylinder and the boring die. Figure 7 This is a schematic diagram of the pad block; Figure 8 This is a top view of the boring die. Detailed Implementation

[0007] See Figures 6 to 8 As shown, a hydraulic cylinder precision machining boring die includes a boring die body 1. A boss 2 is provided on the boring die body 1, and a recessed stepped surface 3 is provided on one side of the boss 2. The boss 2 has connecting holes 4 for connecting hydraulic cylinders. In this embodiment, four holes 4 are provided, which can be arbitrarily opened within the range of the boss 2 according to the bottom shape of the hydraulic cylinder 5, to increase the versatility of connecting various hydraulic cylinders to the boring die body 1. Hex socket screws 6 pass through the hydraulic cylinder connecting holes 4 and connect to the hydraulic cylinder 5. Positioning holes 7 are provided on both the boss 2 and the stepped surface 3 along the center line of the boring die body. In this embodiment, one positioning hole is opened on the boss 2, and two positioning holes are opened on the stepped surface 3. The positioning holes 7 on the stepped surface 3 can be arbitrarily opened according to the length of the hydraulic cylinder 5. The number of positioning holes is increased along the center line. A shim 8 with an opening is set at the positioning hole 7 on the step surface 3. Depending on the actual situation, a shim 8 of appropriate height can be selected to make the entire boring die body adapt to multiple hydraulic cylinders of different sizes. This is simple and convenient and reduces tooling waste. When positioning, first screw two slotted headless screws 9 on the bottom of the hydraulic cylinder 5. One of them is aligned with the positioning hole 7 on the boss 2, and the other is aligned with the shim 8 and the positioning hole 7 on the step surface 3. Insert the screw into the positioning hole 7 for positioning. The slotted headless screw 9 on the step surface 3 passes through the shim 8 and is inserted into the positioning hole. The shim 8 also serves to support the hydraulic cylinder 5 and keep the hydraulic cylinder level.

[0008] The boring die 1 has clamping holes 10 on both sides.

[0009] The clamping process is as follows: 1. After rough machining, the hydraulic cylinder bores D1, D2, D3, D4 and planes P1, P2 all have a 2mm allowance. Then, the hydraulic cylinder is clamped... Figure 6 As shown, it is installed with the boring die 1; 2. Mount the boring die 1 onto the worktable and press... Figure 6 Align the reference surface of the boring die 1, the surface runout ≤ 0.01, and tighten; 3. Align the reference hole D1 and establish the workpiece coordinate system; 4. Leave allowance for finishing of holes and planes with geometric tolerances; 5. Use a coordinate measuring machine (CMM) to check the coordinates and adjust each coordinate based on the CMM results; 6. Repeat step 3 and refine the work according to the drawing.

Claims

1. A hydraulic cylinder finishing boring die characterized by, It includes a boring die body, on which a boss is provided, and a recessed stepped surface is provided on one side of the boss. A connecting hole for connecting a hydraulic cylinder is provided on the boss. Positioning holes are provided on both the boss and the stepped surface along the center line of the boring die body, and a pad is provided at the positioning hole on the stepped surface. Clamping holes are provided on both sides of the boring die body.

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