Grinding and positioning tool for thin-wall pipe body part

Abstract

The utility model discloses a grinding and positioning tool for a thin-walled pipe body, which is characterized in that flange holes are uniformly arranged on a flange end face at one end of a thin-walled pipe body, a fixed base is arranged below the flange end face, at least two groups of tool holes and square holes are uniformly arranged on the fixed base, each group of tool holes and square holes are coaxial, the flange holes are matched with the tool holes, and the flange holes are matched with the square holes. The conical tensioning mechanism penetrates into the flange hole and the tool hole, the tail end of the conical screw is in threaded connection with the square nut, and the square nut is located in the square hole and is in clearance fit with the square hole. The floating principle of a conical tensioning mechanism is utilized in a flange hole, self-centering clamping of a thin-wall pipe body is achieved, a workpiece is clamped in a free state, the thin-wall pipe body workpiece is rapidly aligned and positioned, and the problems that deformation and size precision are difficult to guarantee after grinding are solved.

Description

Technical Field

[0001] The utility model belongs to the field of workpiece clamping tools, and in particular relates to a grinding and positioning tool for a thin-walled pipe body. Background Art

[0002] The existing thin-walled tube workpiece grinding and clamping tooling mostly uses a single workpiece and multiple pressure plates to position the workpiece. Before grinding, the workpiece is fixed to the workbench by the pressure plate, and the grinding process is carried out after the fixed position is qualified. This method has the following disadvantages: inconvenient operation, frequent clamping and adjustment, long metering time, complicated and cumbersome alignment process, and difficult to control deformation and dimensional accuracy. Each clamping requires re-alignment and positioning. When the thin-walled tube workpiece is required to be mass-produced and processed, it is not easy to guarantee the positioning size. The technical requirements control the tooling structure of the tube body part should be safe, reliable and stable. Summary of the invention

[0003] The technical problem to be solved by the utility model is to repeatedly position batches of thin-walled tube workpieces, to facilitate and quickly align the thin-walled tube workpieces, and to ensure that their deformation and dimensional accuracy meet the process technology requirements after grinding.

[0004] The purpose of the utility model is achieved in the following ways:

[0005] A grinding positioning tool for a thin-walled tube body, wherein a flange is provided at one end of the thin-walled tube body, flange holes are evenly arranged on the flange end face, a fixed base is provided below the flange end face of the thin-walled tube body, at least two groups of tooling holes and square holes are evenly arranged on the fixed base, the tooling holes and square holes of each group are coaxial, the flange holes match the tooling holes, a conical tensioning mechanism penetrates the flange holes and the tooling holes, the conical tensioning mechanism comprises a conical screw, a conical block, a conical bushing and an annular spring, a conical bushing is sleeved on the head of the conical screw, vertical grooves are evenly arranged on the outer surface of the conical bushing, an annular spring is transversely sleeved on the outside of the conical bushing, a conical block is also provided between the conical bushing and the conical screw, the conical bushing matches the flange hole, the tail end of the conical screw is threadedly connected to a square nut, the square nut is located in the square hole, and the square hole is gap-matched. The conical screw is a conical head hexagon socket screw.

[0006] An upper conical surface and a lower conical surface are arranged on the inner surface of the conical bushing, and the conical block contacts the lower conical surface.

[0007] The outer surface of the conical bushing is evenly provided with annular grooves for accommodating the annular spring.

[0008] Compared with the prior art, the utility model utilizes the floating principle of the conical tensioning mechanism in the flange hole to realize self-centering clamping of the thin-walled tube body, allowing the workpiece to be clamped in a free state, solving the problem of rapid alignment and positioning of the thin-walled tube body workpiece, and solving the problem of deformation after grinding and difficulty in ensuring dimensional accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of assembling a thin-walled tube workpiece and a grinding positioning tooling of the utility model.

[0010] Figure 2 yes Figure 1 Top view of the .

[0011] Figure 3 It is a structural diagram of the tensioning structure.

[0012] Figure 4 It is a cross-sectional view of the tensioning structure. DETAILED DESCRIPTION

[0013] like Figure 1-4 As shown, a grinding positioning tool for a thin-walled tube body, a flange 11 is provided at one end of the thin-walled tube body 1, flange holes 12 are evenly arranged on the flange end surface, a fixed base 2 is arranged below the flange end surface of the thin-walled tube body, and the bottom of the fixed base 2 is connected to a workbench of a vertical grinder, etc., and at least two groups of tooling holes 21 and square holes 22 are evenly arranged on the fixed base 2, and each group of tooling holes 21 and square holes 22 are coaxial, and the flange hole 12 is matched with the tooling hole 21, and a conical tensioning mechanism 3 is inserted into the flange hole 12 and the tooling hole In the hole 21, the conical tensioning mechanism 3 includes a conical screw 5, a conical block 6, a conical bushing 7 and an annular spring 8. The conical bushing 7 is sleeved on the head of the conical screw 5. Vertical grooves are evenly arranged on the outer surface of the conical bushing 7. The annular spring 8 is transversely sleeved on the outside of the conical bushing 7. A conical block 6 is also arranged between the conical bushing 7 and the conical screw 5. The conical bushing 7 cooperates with the flange hole 12. The tail end of the conical screw 5 is threadedly connected to the square nut 4. The square nut 4 is located in the square hole 22 and is clearance-matched with the square hole 22.

[0014] The conical screw 5 is preferably a conical head hexagon socket screw, and the conical screw 5 is screwed by the hexagon socket of the conical screw head.

[0015] Furthermore, an upper conical surface and a lower conical surface are provided on the inner surface of the conical bushing 7, the conical head of the conical screw 5 cooperates with the upper conical surface, and the conical block 6 cooperates with the lower conical surface.

[0016] The conical bushing 7 is formed into four unconnected petals of the same size, which can expand and tighten on the inner wall of the flange hole 12 to make its tightening force uniform. An annular groove is also provided on the outer surface of the conical bushing 7, and an annular spring 8 is sleeved in the annular groove to restrain the petals of the conical bushing 7 from spreading.

[0017] like Figure 1-2As shown, in addition to the tooling hole 21 and the square hole 22, the fixed base 2 also has a U-shaped step hole. Bolts and nuts are used to connect the fixed base 2 to the workbench of a vertical grinder or the like. Before the fixed base 2 is connected to the workbench of a vertical grinder or the like, the square nut 4 is placed in the square hole 22 of the fixed base 2. The square nut 4 and the square hole 22 are clearance-matched. The workbench of the vertical grinder or the like prevents the square nut from falling out of the square hole 22. The tail end of the conical tensioning structure 3 is screwed into the square nut 4 to complete the pre-tightening and fixing. Since the square nut 4 and the square hole 22 are clearance-matched, the conical screw 5 is slightly tightened downward to fix the square nut 4 to the square hole. The square nut 4 is used as a reference for repeated positioning, and the position of the batch of thin-walled pipe parts remains unchanged when they are repeatedly clamped.

[0018] The thin-walled tube body grinding and positioning tooling in the utility model adopts single-piece high-precision grinding processing, and the conical screw 5, conical block 6, and conical bushing 7 are connected and assembled with a clearance of no more than 0.02mm to ensure the coaxiality of the inner hole of the thin-walled tube body and the center hole of the fixed base.

[0019] Working process: ① Place the fixed base 2 on the rotation center of the workbench of the vertical grinder, etc., fix the base 2 with a micrometer pressure gauge, and re-measure the runout of the rotation center of the workbench of the vertical grinder, etc. to be no more than 0.005mm. Before connecting the fixed base 2 to the workbench of the vertical grinder, etc., place the square nut 4 in the square hole 22 of the fixed base 2, and then select bolts and nuts of appropriate specifications to ensure that the connection length is no higher than the bottom surface of the connection between the thin-walled tube body 1 and the fixed base 2, and do not interfere with the clamping of the next thin-walled tube body. After the workpiece is connected to the fixed base 2 through the U-shaped step hole, ② The thin-walled tube body 1 is placed on the fixed base 2, and the flange hole 12 of the thin-walled tube body 1 and the tooling hole 21 are kept coaxial; ③ The conical block 6 is placed in the flange hole 12 of the thin-walled tube body; ④ The annular spring 8 is set in the outer ring groove of the conical bushing 7, and is placed in the flange hole 12 together with the conical bushing 7; ⑤ The conical screws 5 are placed in the corresponding flange holes 12, and the outer circle of the thin-walled tube body 1 is pressed with a micrometer to rotate at a low speed, and tightened one by one until the runout during the rotation is no more than 0.01mm, and the pre-tightening of the thin-walled tube body 1 is completed; Then use a micrometer to tighten the conical screw 5 while rotating the spindle until the dial runout is no more than 0.005mm during rotation; Before fully fixing and tightening, recheck the contact gap with a measured feeler gauge and adjust it to a contact gap of less than 0.01mm between the thin-walled tube body 1 and the fixed base 2. Tighten the tapered screw 5 for a second time with a hexagonal wrench. Finally, clamp the grinding wheel at the spindle end of the machine tool, use a dial indicator to detect the surface of the grinding wheel, and inspect the grinding surface of the grinding wheel. If it meets the grinding standards, it can be processed according to the operating procedures.

[0020] Through the flange hole, the floating principle of the conical tension sleeve is used to realize the self-centering clamping of the thin-walled tube body, so that the thin-walled tube body workpiece can be clamped in a free state. It not only ensures the cylindricity of the thin-walled tube body workpiece, but also ensures the repeated positioning accuracy of multiple clamping.

[0021] The above is only a preferred embodiment of the present invention. It should be pointed out that, for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A grinding and positioning tool for thin-walled pipe parts, characterized in that: A flange (11) is provided at one end of a thin-walled tube body (1), and flange holes (12) are evenly arranged on the end surface of the flange. A fixed base (2) is provided below the flange end surface of the thin-walled tube body, and at least two groups of tooling holes (21) and square holes (22) are evenly arranged on the fixed base (2). The tooling holes (21) and square holes (22) of each group are coaxial, and the flange hole (12) matches the tooling hole (21). A conical tensioning mechanism (3) is inserted into the flange hole (12) and the tooling hole (21). The conical tensioning mechanism (3) includes a conical screw (5), a conical screw (5), and a conical screw (6). A conical block (6), a conical bushing (7) and an annular spring (8), the conical screw (5) head is sleeved with the conical bushing (7), the outer surface of the conical bushing (7) is evenly provided with vertical grooves, the outer side of the conical bushing (7) is laterally sleeved with an annular spring (8), a conical block (6) is further arranged between the conical bushing (7) and the conical screw (5), the conical bushing (7) is matched with the flange hole (12), the tail end of the conical screw (5) is threadedly connected with the square nut (4), the square nut (4) is located in the square hole (22), and is clearance-matched with the square hole (22).

2. The grinding and positioning tool for thin-walled tube parts according to claim 1, characterized in that: The conical screw (5) is a hexagon socket screw with a conical head.

3. The grinding and positioning tool for thin-walled tube parts according to claim 1, characterized in that: An upper conical surface and a lower conical surface are provided on the inner surface of the conical bushing (7), and the conical block (6) is in contact with the lower conical surface.

4. The grinding and positioning tool for thin-walled tube parts according to claim 1, characterized in that: The outer surface of the tapered bushing (7) is evenly provided with annular grooves for accommodating the annular spring.

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