Curved surface inner hole profiling machining tool based on lathe

Abstract

The utility model discloses a curved surface inner hole profiling machining tool based on a lathe, the middle part of a boring cutter rod of the tool is hinged with one end of a support, and the other end of the support is fixed on a tool rest. The boring cutter is vertically fixed to one end of the boring cutter rod, the other end of the boring cutter rod is hinged to the rolling wheel, and one end of an elastic pressing mechanism vertically arranged in the middle of the boring cutter rod abuts against one side of the support. The explorator is positioned and fixed on the explorator seat, one end of the explorator seat is horizontally fixed on one end head of the conical shaft, the outer edge of the roller is propped against a curved surface on one side of the explorator, a cutting edge of a semicircular plate at one end of the boring cutter is propped against the bottom surface of a blank hole of a workpiece, and a curved surface contour line of the explorator is matched with a curved surface inner hole generatrix of the workpiece. The distance L1 from the center of the semicircular plate to the center of the roller pin is equal to the distance L2 from the center of the hinge pin to the center of the roller pin, and the radius R1 of the semicircular plate is equal to the radius R2 of the roller. The machining difficulty of the curved surface inner hole is greatly reduced, the machining cost is remarkably reduced, and the machining efficiency and the machining quality are improved.

Description

Technical Field

[0001] The utility model relates to a tool for processing special-shaped holes, in particular to a tool for roughing and finishing a rotating body part with a complex curved inner hole using a common lathe, belonging to the technical field of metal cutting processing. Background Art

[0002] The machining of complex internal holes, such as curved or tapered holes, in parts of rotation is typically performed on CNC lathes, resulting in high processing costs. Using conventional lathes requires a high level of operator skill and the creation of a busbar template for the curved internal hole. During machining, the operator must manipulate the machine tool for complex vertical and horizontal feeds, and must frequently stop the machine to measure with the busbar template. This cumbersome, time-consuming, labor-intensive process results in poor quality. Utility Model Content

[0003] The utility model aims to provide a lathe-based curved surface inner hole profiling processing tool with compact structure, convenient operation and high processing quality.

[0004] The utility model is achieved through the following technical solutions:

[0005] A tooling for profiling curved inner holes based on a lathe, comprising a boring tool, a boring tool bar, a roller, a support, an elastic pressing mechanism, a template and a template seat, wherein one end of the boring tool bar is a straight rod and the other end is a curved rod, the middle of the boring tool bar is embedded in one end of the support, a hinge pin passes through a hinge sleeve fixed in the middle of the boring tool bar and one end of the support, so that the boring tool bar is hinged to the support, and the other end of the support is fixed to the tool holder; the boring tool is vertically fixedly connected to the end of the boring tool bar, and the roller pin passes through a fork-shaped seat at the other end of the boring tool bar and a roller sleeve in the roller, so that the roller and the fork are hinged. The shaped seat is hinged; the elastic clamping mechanism is vertically arranged on the middle part of the boring tool rod, located between the hinge pin and the roller pin and close to the support, and one end of the elastic clamping mechanism is against one side of the support; the die is positioned and fixed on the die seat, and the center of one end of the die seat is horizontally fixed on the end head of one end of the tapered shaft, and the other end of the tapered shaft is located in the tailstock of the lathe; the outer edge of the roller is against the curved surface on one side of the die, and the cutting part of one end of the boring tool is a semicircular plate structure, and the cutting edge of the semicircular plate is against the bottom surface of the blank hole of the workpiece, and the curved surface contour line of the die matches the generatrix of the curved inner hole of the workpiece.

[0006] The purpose of the utility model can be further achieved by the following technical measures.

[0007] Furthermore, the line connecting the center of the semicircular plate of the boring tool and the center of the roller pin passes through the center of the hinge pin, and the distance L1 from the center of the semicircular plate to the center of the roller pin is equal to the distance L2 from the center of the hinge pin to the center of the roller pin; the radius R1 of the semicircular plate is equal to the radius R2 of the roller.

[0008] Furthermore, the elastic clamping mechanism includes a clamping stud and a compression spring, one end of the clamping stud is screwed into the middle screw hole of the boring bar, one end of the compression spring is sleeved on the positioning column extending from the other end of the clamping stud, and the other end of the compression spring is sleeved on the support positioning column opposite to the positioning column.

[0009] Furthermore, a right-angle positioning edge is vertically extended upward from one corner of the mold base, and one corner of the mold leans against the right-angle positioning edge. The mold is fixed to the bottom plane of the mold base by a plurality of fastening screws.

[0010] Furthermore, the roller and the matrix are both made of low alloy steel through carburizing and quenching, the depth of the carburized layer is 1.6-2.3 mm, the quenching hardness of the roller is HRC58-62, and the quenching hardness of the matrix is ​​HRC52-56.

[0011] The utility model adopts a boring bar with an equal force arm lever and a structure in which the radius of the cutting portion of the boring tool is equal to the radius of the roller. When performing the profiling of the inner hole of the curved surface of the workpiece, the feed curve trajectory of the boring tool is the same as the trajectory of the roller rolling along the curved surface of the mold side. Therefore, the precise profiling of the inner hole of the curved surface of the workpiece can be achieved using an ordinary lathe, which greatly reduces the processing difficulty of the inner hole of the curved surface, significantly reduces the processing cost, and improves the processing efficiency and processing quality.

[0012] Advantages and features of the present invention will be illustrated and explained through the following non-limiting description of preferred embodiments, which are given as examples only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of the utility model;

[0014] Figure 2 yes Figure 1 A-direction enlarged partial view;

[0015] Figure 3 This is the principle diagram of profile boring of inner holes on curved surfaces. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 and Figure 2 As shown, the utility model includes a boring tool 1, a boring bar 2, a roller 3, a support 4, an elastic pressing mechanism 5, a backing plate 6 and a backing plate seat 7. The middle part of the boring bar 2 is embedded in one end of the support 4, and the hinge pin 8 crosses through the hinge sleeve 81 fixed in the middle part of the boring bar 2 and one end of the support 4, so that the boring bar 2 is hinged to the support 4, and the roller pin 31 crosses through the fork seat 21 at the right end of the boring bar 2 and the roller sleeve 32 of the roller 3, so that the roller 3 is hinged to the fork seat 21.

[0018] The elastic clamping mechanism 5 is vertically arranged on the middle part of the boring bar 2, located between the hinge pin 8 and the roller pin 31 and close to the support 4. It includes a clamping stud 51 and a compression spring 52. One end of the clamping stud 51 is screwed into the middle screw hole 22 of the boring bar 2, and one end of the compression spring 52 is sleeved on the positioning column 511 extending from the other end of the clamping stud 51. The other end of the compression spring 52 is sleeved on the support positioning column 41 opposite to the positioning column 511. The restoring elastic force generated by the compression spring 52 of the elastic clamping mechanism 5 when compressed causes the roller 3 to press against the curved surface 61 of the backing die 6, thereby causing the semicircular cutting edge at the left end of the boring bar 1 to rest against the bottom surface of the blank hole of the workpiece 20, ensuring that the contour line of the curved surface 61 of the backing die 6 matches the curved inner hole generatrix 201 of the machined workpiece 20.

[0019] The cutting portion 11 at one end of the boring tool 1 is a semicircular plate structure, and the semicircular plate radius R1 is equal to the roller radius R2. The square cross-section shank 12 at the other end of the boring tool 1 is vertically inserted into the left end of the boring bar 2 and fixedly connected to the left end of the boring bar 2 by a fastening screw 13.

[0020] The pawl 6 is positioned and fixed to the pawl base 7 via three fastening screws 13. The center of the right end of the pawl 6 is fixed to the left end of the tapered shaft 301 via four fastening screws 13. The right end of the tapered shaft 301 is located in the lathe tailstock 30. The outer edge of the roller 3 rests on the curved surface of one side of the pawl 6, and the cutting edge of one end of the boring tool 1 rests on the bottom surface of the blank hole of the workpiece 20. The curved contour of the pawl 6 matches the inner diameter of the curved surface of the workpiece 20.

[0021] The roller 3 and the paving 6 are both made of low-alloy steel through carburizing and quenching. The carburized layer depth is 1.6-2.3mm. The quenching hardness of the roller 3 is HRC58-62, and the quenching hardness of the paving 6 is HRC52-56. This improves the wear resistance of the roller 3 and the paving 6 and extends their service life.

[0022] like Figure 3 As shown, in ΔCOE and ΔDOF, EO(L1) = OD(L2), and the two sides are equal, indicating that the boring bar 1 is an equal-arm lever. Because the other side of ΔCOE, CE(R1), is equal to the other side of ΔDOF, DF(R2), when the roller 3 at the right end of the boring bar 2 rolls along the curved surface 61 on one side of the support mold 6, the feed curve of the boring tool 1 at the left end of the boring bar 2 matches the curvature of the curved surface 61. This allows precise contouring of the curved inner hole 201 of the workpiece 20, significantly reducing the difficulty of machining curved inner holes.

[0023] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A tool for profiling curved inner holes based on a lathe, characterized in that: The tool holder includes a boring tool, a boring tool rod, a roller, a support, an elastic pressing mechanism, a template and a template seat. One end of the boring tool rod is a straight rod, and the other end of the boring tool rod is a curved rod. The middle part of the boring tool rod is embedded in one end of the support. The hinge pin crosses through the hinge sleeve fixed in the middle part of the boring tool rod and one end of the support, so that the boring tool rod and the support are hinged. The other end of the support is fixed on the tool holder. The boring tool is vertically fixed to one end of the boring tool rod. The roller pin crosses through the fork seat at the other end of the boring tool rod and the roller sleeve in the roller, so that the roller and the fork seat are hinged. The elastic pressing mechanism The tightening mechanism is vertically arranged on the middle part of the boring tool rod, located between the hinge pin and the roller pin and close to the support, and one end of the elastic clamping mechanism rests on one side of the support; the die is positioned and fixed on the die seat, and one end of the die seat is horizontally fixed on the end head of one end of the tapered shaft, and the other end of the tapered shaft is located in the tailstock of the lathe; the outer edge of the roller rests on the curved surface of one side of the die, and the cutting part of one end of the boring tool is a semicircular plate structure, and the cutting edge of the semicircular plate rests on the bottom surface of the blank hole of the workpiece, and the curved surface contour line of the die matches the generatrix of the curved inner hole of the workpiece.

2. The tooling for profiling inner holes on curved surfaces based on a lathe according to claim 1, characterized in that: The line connecting the center of the semicircular plate of the boring tool and the center of the roller pin passes through the center of the hinge pin. The distance L1 from the center of the semicircular plate to the center of the roller pin is equal to the distance L2 from the center of the hinge pin to the center of the roller pin. The radius R1 of the semicircular plate is equal to the radius R2 of the roller.

3. The tooling for profiling inner holes on curved surfaces based on a lathe according to claim 1, characterized in that: The elastic clamping mechanism includes a clamping stud and a compression spring. One end of the clamping stud is screwed into the middle screw hole of the boring bar, one end of the compression spring is sleeved on the positioning column extending from the other end of the clamping stud, and the other end of the compression spring is sleeved on the support positioning column opposite to the positioning column.

4. The tooling for profiling inner holes on curved surfaces based on a lathe according to claim 1, characterized in that: One corner of the die base extends vertically upward to form a right-angle positioning edge, one corner of the die is pressed against the right-angle positioning edge, and the die is fixed to the bottom plane of the die base by a plurality of fastening screws.

5. The tooling for profiling inner holes on curved surfaces based on a lathe according to claim 1, characterized in that: The roller and the matrix are both made of low alloy steel through carburizing and quenching, the depth of the carburized layer is 1.6-2.3 mm, the quenching hardness of the roller is HRC58-62, and the quenching hardness of the matrix is ​​HRC52-56.

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