CN201684931U - A combined trapezoidal internal thread turning tool - Google Patents

Abstract

The utility model discloses a combined turning tool for processing trapezoidal internal threads, which consists of a tool bar (1), a left forming tool (2), a right forming tool (3), a slotting tool (4), and a compression screw. (5) Composition, on the cutter bar, there is a cutter hole, and the left forming cutter, the right forming cutter, the slotting cutter are installed side by side in the cutter holder hole on the cutter holder and are fastened by the compression screw 5. It adopts a combined structure, which can complete multi-tool turning of threads in one cutting process, reduce the number of cutting times of cutting threads, improve work efficiency by 2 to 3 times compared with ordinary tools, and thread accuracy can reach about 3 grades. At the same time, it can It meets the needs of trapezoidal thread processing precision, the surface roughness of thread processing is small, and the processing efficiency is high. It has the characteristics of simple structure, convenient disassembly, high hardness, good impact toughness and long service life.

Description

A combined trapezoidal internal thread turning tool

technical field

The utility model belongs to the technical field of metal processing tools, and mainly relates to a combined trapezoidal internal thread turning tool.

Background technique

At present, when using a single thread cutter to turn trapezoidal internal threads, it is necessary to determine the number of feeds according to the difference in the nominal diameter and pitch of the trapezoidal internal threads, and to perform multiple cuttings to achieve the final shape of the thread. Steps such as forward feed, axial feed, thread turning, and reverse retraction are repeated in this way. Therefore, the more feed times, the longer the thread processing time, and the lower the production efficiency. At the same time, when the trapezoidal thread is turned by a single thread cutter, since one blade is used for cutting, although the load on the tool tip can be reduced, the thread accuracy and roughness are relatively average.

Contents of the invention

The purpose of this utility model is to propose a combined trapezoidal internal thread turning tool. The multi-tool turning of the thread can be completed in one feed process, which reduces the number of feeds when cutting the thread and improves production efficiency. At the same time, it can also meet the needs of trapezoidal thread machining accuracy.

The technical scheme adopted by the utility model to realize the above-mentioned purpose is: it is mainly composed of a cutter bar, a left forming cutter, a right forming cutter, a slotting cutter, and a compression screw. There is a rectangular cutter hole on the cutter rod, and the left forming cutter, The right forming tool and the slotting tool are installed side by side in the tool hole on the knife bar, and are fastened on the knife bar by compression screws.

The utility model adopts a combined structure, which can complete the multi-tool turning of the thread in one cutting process, reduce the number of times of cutting the thread, improve the work efficiency by more than 2 to 3 times compared with ordinary cutting tools, and the thread precision can reach about 3 grades. On the premise of ensuring the precision of thread processing, the processing efficiency of trapezoidal internal thread can be greatly improved, especially suitable for the processing of trapezoidal internal thread with diameter and large pitch. At the same time, it can also meet the needs of trapezoidal thread processing accuracy, the surface roughness of thread processing is small, and the processing efficiency is high. It has the characteristics of simple structure, convenient disassembly, high hardness, good impact toughness and long service life.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a bottom view of Fig. 1 . .

In the figure: 1. Tool bar, 2. Left forming tool, 3. Right forming tool, 4. Slotting tool, 5. Compression screw.

Detailed ways

In conjunction with accompanying drawing, provide the specific embodiment of the present utility model as follows:

As shown in Figure 1, the present embodiment is made up of cutter bar 1, left forming cutter 2, right forming cutter 3, slotting cutter 4, and compression screw 5. The tool bar 1 is in a square shape. In order to improve the rigidity of the tool, reduce the vibration during processing, and improve the processing efficiency, the tool bar is made of high-quality 45 steel material and has been quenched and tempered. The hardness requirement is HRC26-32, and 40Cr can also be used As a tool holder material, the tool rigidity can be further improved. The tool material is W18Cr4V, and the hardness is about HRC63-66. In order to improve the service life of the tool, W6MO5Cr4V2 high-speed steel with better red hardness and wear resistance can also be used to reduce the number of sharpening times and improve production efficiency. A certain length of 1\4 arc grooves (as shown in Figure 2) is processed at the upper right corner of the front end of the cutter bar 1, and its main function is to reduce the continuity of cutting vibration. A plane is machined on the right side of the tool holder 1 (as shown in Figure 3), the purpose is to prevent the tool holder from hitting the workpiece hole wall when cutting internal threads, and avoid machining interference. A through rectangular tool groove is processed on the tool bar 1. In order to improve the installation accuracy of the tool on the tool bar, the tool slot on the tool bar is formed by CNC wire cutting, and the dimensional accuracy error can be controlled within 0.1mm. Slotting tool 4, right forming tool 3, and left forming tool 2 are installed in this tool slot in sequence from left to right. Fastened on the tool bar 1, the compression screw 5 is assembled on the leftmost side of the tool bar 1 by threaded connection. By tightening the compression screw 5, the left forming tool 2, the right forming tool 3, and the slotting tool 4 can be tightened. It is fixed on the tool bar 1, and when the tool needs to be disassembled, only the compression screw 5 needs to be loosened, so the disassembly and assembly of the tool is very convenient, and is very suitable for efficient machining of trapezoidal internal threads. Each tool must be sharpened according to the template to ensure the shape of the tool. In order to improve the processing efficiency and ensure the accuracy of thread processing, the specific geometric parameters of the slotting tool 2 are: rake angle γ = 15°, relief angle α = 8°, Auxiliary relief angle α right=1°13′Auxiliary relief angle α left=4°; the specific geometric parameters of forming tools 3 and 4 are: rake angle γ=12°, right edge relief angle α=4°, left edge relief angle Angle α=8°, forming angle is 30°

When in use, when installing the tool on the tool holder of the machine tool, it is necessary to ensure that the tip of each tool is aligned with the center of the workpiece, so that the machining accuracy requirements of the thread can be met. When cutting, the frontmost slotting cutter is used to open the thread groove first, so as to remove the machining allowance of the first process, and then the left forming tool 2 and the right forming tool 3 are sequentially turned, so that the trapezoidal internal thread can be turned into shape at one time. Therefore, the work efficiency can be improved by 2 to 3 times compared with ordinary tools, and the thread accuracy can reach about 3 grades, so the processing efficiency of trapezoidal internal threads can be greatly improved on the premise of ensuring the thread processing accuracy, especially suitable for diameter, large pitch trapezoid Processing of internal threads. Since both sides of the thread are formed by turning with two tools respectively, and the multi-tool cutting reduces the machining allowance of the following tools in turn, so the left and right forming tools can use larger rake angles, so that the cutting is brisk and trapezoidal The precision of thread profile is good, the surface roughness of thread processing is small, and the processing efficiency is high.

Claims (4)

1. A combined trapezoidal internal thread turning tool is characterized in that: it consists of a cutter bar (1), a left forming tool (2), a right forming tool (3), a slotting tool (4), a compression screw (5 ) form, the cutter bar has a cutter hole, and the left forming cutter, the right forming cutter and the slotting cutter are arranged side by side in the cutter holder hole on the cutter holder and are fastened on the cutter holder (1) by the compression screw (5). 2. The combined trapezoidal internal thread turning tool according to claim 1, characterized in that: said tool holder (1) is in a square shape. 3. The combined trapezoidal internal thread turning tool according to claim 1 or 2, characterized in that: an arc groove is machined at the upper right corner of the front end of the tool holder (1). 4. The combined trapezoidal internal thread turning tool according to claim 1 or 2, characterized in that: a plane is machined on the right side of the tool holder (1). the

Images