Positioning and pressing mandrel

Abstract

The utility model belongs to the technical field of machining, and relates to a positioning and pressing mandrel. A core shaft of the positioning and pressing core shaft is of a stepped cylindrical structure; the mandrel is provided with a cylinder I matched with an inner hole of a workpiece and a cone frustum body conveniently inserted into the inner hole of the workpiece; the cone frustum body is positioned at the lower part of the cylinder I and is of a reducing structure; a cylinder II used for being matched with an inner hole of a positioning clamp is arranged at the lower end of the cone frustum body. The cylinder I, the cone frustum body and the cylinder II are coaxially arranged; a circular cover plate is arranged at the top end of the cylinder I; the diameter of the cover plate is larger than that of an inner hole of the workpiece. A step through hole penetrating through the cover plate, the cylinder I and the cone frustum body is formed in the mandrel; a bolt matched with the stepped through hole is used for fixedly connecting the core shaft with a positioning clamp positioned at the lower part of the workpiece; and a handle is mounted in the center of the top of the cover plate. The utility model has the advantages of simple structure, firmness, durability and high working efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing and relates to a positioning and pressing core shaft. Background Art

[0002] In mechanical processing, workpieces with irregular shapes are often encountered, but they need to be processed in terms of both outer shape and inner hole, and the precision of the outer shape and inner hole is required to be high. The existing processing method is to use different fixtures to complete the installation and positioning of the workpiece, resulting in secondary assembly of the workpiece, which affects the processing accuracy of the workpiece. In addition, the use of different fixtures not only occupies the machine tool worktable area, but repeated disassembly and assembly also increases the processing time, reducing the processing efficiency of the workpiece. Utility Model Content

[0003] The utility model aims to provide a positioning and clamping mandrel which can be used in conjunction with a workpiece positioning fixture; it can be used alone as a positioning mandrel and pulled out after being positioned and clamped by a workpiece fixture to process the inner hole of the workpiece; it can also directly clamp the workpiece after positioning to process the workpiece shape.

[0004] The utility model adopts the following technical solutions to achieve the above purpose:

[0005] A positioning and clamping mandrel, the positioning and clamping mandrel has a mandrel of a stepped cylindrical structure; the mandrel comprises a cylinder I which matches with the inner hole of a workpiece and a truncated cone which is convenient for inserting into the inner hole of the workpiece; the truncated cone is located at the lower part of the cylinder I and is a structure with a gradually decreasing diameter; the lower end of the truncated cone has a cylinder II which matches with the inner hole of a positioning fixture; the cylinder I, the truncated cone and the cylinder II are coaxially arranged; the top end of the cylinder I has a circular cover plate; the diameter of the cover plate is larger than the diameter of the inner hole of the workpiece; the mandrel has a stepped through hole which passes through the cover plate, the cylinder I and the truncated cone; bolts which match with the stepped through hole securely connect the mandrel to the positioning fixture located at the lower part of the workpiece; a handle is installed at the top center of the cover plate.

[0006] The handle is a knurled cylindrical structure as a whole, and the handle is threadedly connected to the positioning and pressing core shaft through the lower end.

[0007] A cylinder III having a diameter smaller than that of the cylinder II is provided between the cylinder II and the truncated cone.

[0008] The utility model discloses a positioning and pressing mandrel, which can be pulled out after positioning the workpiece to process the inner hole of the workpiece; or the mandrel can be pressed by a screw after positioning, and then the workpiece can be pressed to process the shape of the workpiece; a detachable handle is adopted, and when it is used as the positioning and pressing mandrel for processing the shape, if the handle affects the processing, the handle can be removed after positioning and pressing; the utility model has a simple structure, is sturdy and durable, and has high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the handle of the utility model.

[0010] Figure 2 , Figure 3 It is a schematic diagram of the mandrel of the utility model.

[0011] Figure 4 It is a structural schematic diagram of the utility model.

[0012] Figure 5 This utility model is used to illustrate Figure 1 .

[0013] Figure 6 This utility model is used to illustrate Figure 2 .

[0014] Among them: 1. handle; 2. mandrel; 3. bolt; 4. workpiece; 5. positioning fixture; 1-1. external thread; 2-1. cover plate; 2-2. cylinder I; 2-3. frustum, 2-4. stepped through hole; 2-5: threaded hole, 2-6 cylinder II, 2.7. cylinder III. DETAILED DESCRIPTION

[0015] The utility model is described in conjunction with the accompanying drawings and specific implementation schemes:

[0016] As shown in FIG. 4 , a positioning and pressing mandrel, the mandrel 2 of the positioning and pressing mandrel is a stepped cylindrical structure; Figure 2 , Figure 3 The mandrel 2 has a cylinder Ⅰ2-2 that matches the inner hole of the workpiece and a truncated cone 2-3 that is convenient for inserting into the inner hole of the workpiece; the truncated cone 2-3 is located at the lower part of the cylinder Ⅰ2-2 and has a gradually decreasing diameter structure; the lower end of the truncated cone 2-3 has a cylinder Ⅱ2-6 that matches the inner hole of the positioning fixture; between the cylinder Ⅱ2-6 and the truncated cone 2-3, there is a cylinder Ⅲ2-7 whose diameter is smaller than that of the cylinder Ⅱ; The cylinder Ⅰ2-2, the truncated cone 2-3 and the cylinder Ⅱ2-6 are coaxially arranged; the top of the cylinder Ⅰ2-2 has a circular cover plate 2-1; the diameter of the cover plate 2-1 is larger than the diameter of the inner hole of the workpiece 4; the mandrel 2 has a stepped through hole 2-4 that penetrates the cover plate, the cylinder Ⅰ and the truncated cone; the bolts matching the stepped through hole fix the mandrel with the positioning fixture 5 located at the bottom of the workpiece; the top center of the cover plate is installed with a handle 1; combined with Figure 1 The handle 1 is a knurled cylindrical structure as a whole, and the handle is threadedly connected to the positioning and clamping core shaft through the lower end.

[0017] like Figure 5As shown, when used for machining the shape of a workpiece, first install the handle 1 into the threaded hole 2-5 on the core shaft 2 to form a positioning and clamping core shaft; place the workpiece 4 on the matching positioning fixture 5, pass the positioning and clamping core shaft through the inner hole of the workpiece 4, insert the positioning cylinder 2-3 into the positioning hole on the workpiece positioning fixture 5, and at the same time, make the positioning cylinder 2-2 of the positioning core shaft cooperate with the inner hole of the workpiece 4 for positioning, then use the bolt 3 to pass through the step through hole 2-4, tighten the screw to clamp the positioning core shaft 2, when machining the shape of the workpiece 2, if the handle 1 affects the machining, the handle 1 can be removed after positioning and clamping.

[0018] After the workpiece shape is processed, Figure 6 After the workpiece 4 is pressed from the outside of the inner hole, the bolt 3 is loosened, and then the mandrel is pulled out, and the inner hole of the workpiece can be processed without disassembling the workpiece.

Claims

1. A positioning and pressing mandrel, characterized in that: The positioning and clamping core shaft has a stepped cylindrical structure; the core shaft has a cylinder I that matches the inner hole of the workpiece and a truncated cone that is convenient for inserting into the inner hole of the workpiece; the truncated cone is located at the lower part of the cylinder I and is a structure with a gradually decreasing diameter; the lower end of the truncated cone has a cylinder II that matches the inner hole of the positioning fixture; the cylinder I, the truncated cone and the cylinder II are coaxially arranged; the top end of the cylinder I has a circular cover plate; the diameter of the cover plate is larger than the diameter of the inner hole of the workpiece; the core shaft has a stepped through hole that passes through the cover plate, the cylinder I and the truncated cone; the bolts that match the stepped through hole securely connect the core shaft to the positioning fixture located at the lower part of the workpiece; a handle is installed at the top center of the cover plate.

2. A positioning and pressing mandrel according to claim 1, characterized in that: The handle is a knurled cylindrical structure as a whole, and the handle is threadedly connected to the positioning and pressing core shaft through the lower end.

3. A positioning and pressing mandrel according to claim 1, characterized in that: A cylinder III having a diameter smaller than that of the cylinder II is provided between the cylinder II and the truncated cone.

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