Turning tool for machining irregular taper hole

Abstract

The utility model relates to a turning tool for machining irregular taper holes, belongs to the field of machining, and is mainly used for machining various parts. A turning tool for machining irregular taper holes is mainly used for machining irregular taper holes or irregular inner holes and is applied to intermittent machining. The tool manufacturing method is simple, and the turning tool is divided into a tool bar and a blade. After finish machining of a cutter bar raw material, heat treatment, linear cutting and milling of the shape of the cutter bar are carried out, it is guaranteed that the tool cutting edge angle theta 1 is equal to the angle theta 2 of the irregular taper hole, the radial distance r1 between a tool nose and the cutter bar is smaller than the radial distance R1 of the minimum end of the irregular taper hole, the outer circle of the cutter bar is ground through an outer circle grinder, the roughness of the cutter bar reaches 0.8, and finally the cutter bar needs to be subjected to nitriding treatment. The surface hardness and corrosion resistance are improved, SAM440 is selected as the material of the blade, and the heat treatment hardness HRC is 38-45. Through actual production and use, the turning tool is good in effect, and the roughness of the surface of the machined taper hole is good.

Description

Technical Field

[0001] The utility model relates to a turning tool for processing irregular tapered holes, belonging to the field of mechanical processing. Background Art

[0002] As we all know, in the production practice of turning processing, the turning process can be divided into two types: continuous turning and intermittent turning. Intermittent turning is a discontinuous cutting or uneven cutting method. During the intermittent turning process, the turning tool will produce thermal cracks and thermal fatigue due to the effect of stress and temperature, and it is very easy to break the edge. Therefore, the cutting performance of the turning tool is extremely demanding. Based on the experience of various turning tool structures and processing requirements, this utility model patent involves a turning tool for processing irregular tapered holes, which is used for the processing of irregular tapered holes or other irregular inner holes. After actual production use, the effect is good and it is worthy of promotion and application. Summary of the invention

[0003] The utility model discloses a turning tool for processing irregular tapered holes, which is characterized by wide application, simple structure and manufacturing method, being able to meet the requirements of intermittent turning of irregular tapered holes, and having good roughness of the processed surface.

[0004] In order to ensure the smooth progress of cutting processing and obtain a qualified machined surface, the cutting part of the tool used must have a reasonable geometric shape. The tool angle is an important parameter used to determine the geometric shape of the cutting part of the tool. The tool angles mainly include the main deflection angle, the secondary deflection angle, the front angle, the back angle, etc. The turning tool for processing irregular tapered holes described in this patent has optimized the blade angle to meet the requirements. The main deflection angle is consistent with the angle of the processed tapered hole. The radial distance between the tool tip and the tool shank is less than the radial distance of the minimum end of the processed tapered hole. The blade material is SAM440, the heat treatment hardness is HRC38~45, and the outer circle roughness of the tool shank is ground to 0.8. During processing, the turning force is concentrated on the main cutting edge, which improves the force condition and heat dissipation conditions of the blade, and can improve the strength and impact resistance of the cutting edge. In order to meet the dimensional accuracy requirements of rough and fine processing, according to the performance of the workpiece material, the front angle is ground using tools to improve the performance of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 This is a schematic diagram of the structure of a turning tool for machining irregular tapered holes.

[0006] In the figure, 1 is the blade, 2 is the tool holder, θ1 is the main deflection angle, r1 is the radial distance between the tool tip and the tool holder, and 0.8 is the roughness of the outer circle of the tool holder.

[0007] Figure 2 Schematic diagram of irregular cone hole structure

[0008] In the figure, θ2 is the angle of the irregular tapered hole, and R1 is the radial distance of the minimum end of the irregular tapered hole. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described below by specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0010] Specific implementation method: The turning tool for processing irregular tapered holes involved in the utility model is suitable for CNC machine tools, and the turning tool is divided into a tool bar and a blade. The raw material of the tool bar is heat treated after fine processing, and the wire cutting and milling tool bar shape are ensured to ensure that the main deflection angle θ1 is equal to the angle θ2 of the irregular tapered hole, and the radial distance r1 between the tool tip and the tool bar is less than the radial distance R1 of the smallest end of the irregular tapered hole. The outer circle of the tool bar is ground with an external cylindrical grinder to make its roughness reach 0.8, and the tool is used to grind the front angle to the requirement, which can reduce tool interference. The tool bar needs to be nitrided at last to improve the surface hardness and corrosion resistance. The blade material is SAM440, and the heat treatment hardness is HRC38~45. A turning tool for processing irregular tapered holes has been used in actual production, and the effect is good, and the roughness of the processed tapered hole surface is good.

Claims

1. A turning tool for machining irregular tapered holes, characterized in that: The turning tool consists of a tool bar and a blade. The main deflection angle θ1 of the turning tool is equal to the angle θ2 of the irregular tapered hole. The radial distance r1 between the tool tip and the tool bar is smaller than the radial distance R1 of the smallest end of the irregular tapered hole.

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