Outer diameter back cutter special for lathe

Abstract

The outer diameter back cutter special for the lathe comprises a cutter body, a positioning cabin arranged at the using end of the cutter body and a screw used for fixing a blade. Wherein the cutter body is step-shaped; the left end of the positioning cabin is a step-shaped groove which is concave downwards, a rectangular boss is arranged in the middle of the groove, a threaded hole for fixing a blade is formed in the middle of the boss, a first clearance groove and a second clearance groove are formed in the left side and the right side of the top end of the boss, and the first clearance groove and the second clearance groove are semicircular. And the blade is screwed on the positioning cabin of the cutter body through a screw in the middle. The utility model is not easy to deform in long-term use, so that the processing cost is reduced; in addition, when materials which are difficult to machine and have strong interruption are machined, the quality of machined products and the working efficiency are improved; meanwhile, the service life of the cutter with the blade is prolonged; and the rigidity of the cutter body is more than one time greater than that of a standard 4mm slot cutter, so that the purpose of reducing the cost of the cutter is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical manufacturing, in particular to an outer diameter back cutting knife for a lathe. Background Art

[0002] At present, in the outer diameter back-cutting circle processing of the intermediate shell, a lathe equipment is generally used, and the processed position is located at the lower part of the outer circle of the large diameter blank, and the width of the processed position is greater than or equal to 9mm and less than or equal to 15mm.

[0003] In the existing market, only standard back cutters can be used for processing. Standard back cutters are mostly integrated machine clamped or split blade type grooving cutters and cutting cutters. Such cutters have large cutting overhang, but they have many disadvantages: generally, V-groove positioning is used. The rigidity of the cutter body depends on the width of the selected blade. Generally, the back cutting processing volume of castings is only 2mm. Normally, a 4mm wide groove blade is selected. The corresponding groove cutter clamping position thickness can only be less than 4mm. Therefore, its rigidity is insufficient. When encountering difficult-to-process strong intermittent materials, deformation problems will generally occur after processing thousands of shells, resulting in the scrapping of the cutter body. In addition, each blade can only use two cutting edges, and the price of the groove blade is relatively expensive. Utility Model Content

[0004] The utility model aims to provide a special outer diameter back cutting tool for lathes to solve the technical problems that the positioning grooves of existing grooving tools and cutting tools are easy to deform, the tool body is insufficient in rigidity, especially when processing difficult-to-process strong intermittent materials, the tool body is easy to be scrapped, and the processing cost is high.

[0005] To achieve the above purpose, the specific technical solution of the lathe special outer diameter back cutter of the utility model is as follows:

[0006] A special outer diameter back cutter for lathe comprises: a cutter body, a positioning cockpit arranged at the use end of the cutter body, and a screw for fixing a blade; wherein the cutter body is stepped; the left end of the positioning cockpit is a stepped groove concave downward, a rectangular boss is arranged in the middle of the groove, a threaded hole for fixing the blade is arranged in the middle of the boss, and a first empty knife groove and a second empty knife groove are provided on the left and right sides of the top end, and the first empty knife groove and the second empty knife groove are semicircular, and in order to prevent interference between the assembled blade and the cutter body, the blade is tightened on the positioning cockpit of the cutter body by screws in the middle.

[0007] Furthermore, the fixed end of the blade body is a 32 mm×32 mm square blade rod, which is formed by welding or integral forming and is formed on one end of the stepped blade body.

[0008] Furthermore, the positioning cabin is a concave three-step stepped rectangular groove, and the thickness of the stepped steps where the positioning cabin is located can be designed according to the size of the interference position to be processed; the overhang amount can be specifically adjusted according to the depth of the interference position to be processed.

[0009] Furthermore, the blade is provided with a stepped groove which cooperates with the boss in the positioning cabin of the blade body. When the blade is installed on the blade body, the blade cooperates with the positioning cabin of the blade body and is locked with the screw through the eccentric screw hole so that it fits tightly with the positioning surface of the positioning cabin.

[0010] Furthermore, the blades are formed by batch pressing, and the blades are designed to be rectangular blades with a thickness of 4 mm to 6 mm.

[0011] The utility model of the lathe special outer diameter back cutting knife has the following advantages:

[0012] During the back-cutting process of the processing position with a width greater than or equal to 9mm and less than or equal to 15mm, the utility model makes the tool body more rigid, not only is it not easy to deform in long-term use, but also greatly reduces the processing cost; moreover, when processing difficult-to-process strong discontinuous materials, the quality of the processed products and the work efficiency are improved; at the same time, the service life of the tool blade is also improved. For example, when the back-cutting processing amount of the casting is only 2mm and the interference range is 10mm, the front end of the tool body can be designed to be 9mm thick and the blade can be designed to be a rectangular blade with a thickness of 4mm; in this way, the rigidity of the tool body is more than 1 times greater than that of the standard 4mm slot cutter, thereby achieving the purpose of reducing the tool cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a side view structural schematic diagram of the utility model;

[0015] Figure 3 It is a schematic diagram of the discrete component structure of the utility model.

[0016] Description of the markings in the figure:

[0017] 1. Blade body; 10. Thick end of blade body; 2. Transition end of blade body; 3. Thin end of blade body; 4. Positioning cockpit; 5. Blade; 6. Screw; 7. First empty blade groove; 8. Second empty blade groove. DETAILED DESCRIPTION

[0018] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 , Figure 2 , Figure 3As shown, the utility model comprises: a cutter body 1, a positioning cabin 4 arranged at the use end of the cutter body 1 (i.e., at the left end of the cutter body 1), and a screw 6 for fixing a blade 5; wherein the cutter body 1 is stepped (i.e., the end connected to the lathe is the thick end 10 of the cutter body 1, the end connected to the blade 5 is the thin end 3 of the cutter body, and the middle is the transition end 2 of the cutter body connecting the thick end and the thin end); and the left end of the positioning cabin 4 (i.e., the thin end 3 of the cutter body) is a stepped groove concave downward, a rectangular boss is arranged in the middle of the groove, a threaded hole for fixing the blade 5 is arranged in the middle of the boss, and the left and right sides of the top thereof are provided with a first empty cutter groove 7 and a second empty cutter groove 8, and the first empty cutter groove 7 and the second empty cutter groove 8 are semicircular, and in order to prevent interference between the assembled blade 5 and the cutter body 1, the blade 5 is tightened on the positioning cabin 4 of the cutter body 1 by a screw 6 in the middle. The positioning cabin 4 is used to install the blade 5.

[0020] The shape of the blade body 1 is formed by welding or integral forming.

[0021] When the back-cutting processing amount of the casting is only 2mm and the interference range is 10mm, the front end of the tool body 1 (i.e. the thin end 3 of the tool body) can be designed to be 9mm thick according to the size of the interference position to be processed, and the blade 5 is designed to be a 4mm thick rectangular blade 5; the rigidity of the tool body 1 is more than 1 times greater than that of the standard 4mm groove tool, thereby achieving the purpose of reducing the tool cost.

[0022] The above-mentioned positioning cabin 4 is a three-step stepped rectangular groove with a concave bottom. In the middle of the positioning cabin 4 is a rectangular boss. The boss has two functions. The first function is to prevent the blade 5 from being installed in the wrong direction, and the second function is to increase the depth of the screw locking the blade 5. On both sides of the top right part of the stepped rectangular groove, there is a downward concave first empty knife groove 7 and a second empty knife groove 8, and the first empty knife groove 7 and the second empty knife groove 8 are semicircular downward concave empty knife grooves, which are arranged in: the rectangular groove on the outside of the thin end 3 of the knife body.

[0023] The fixed end of the blade body 1 is a 32mm×32mm square blade rod, which is connected to one end of the blade body transition end 2 by welding or integral forming, and is formed on one end of the stepped blade body 1.

[0024] The thickness of the step of the stepped tool body 1 where the positioning cabin 4 is located can be designed according to the size of the interference position to be processed; similarly, the overhang of the stepped step where the positioning cabin 4 is located can be specifically adjusted according to the depth of the interference position to be processed.

[0025] The above-mentioned blade 5 is provided with a stepped groove that cooperates with the boss in the positioning cabin 4 of the blade body 1, and is provided with a stepped directional groove that matches the special-shaped directional boss. When the blade 5 is installed on the blade body 1, the blade 5 cooperates with the positioning cabin 4 of the blade body 1, and the screw 6 is locked through the eccentric screw hole to make it tightly fit with the positioning surface of the positioning cabin 4.

[0026] The above-mentioned blades 5 are formed by batch pressing, and each blade 5 is provided with four cutting edges, which greatly improves the economy (the traditional standard back cutting blade can only use two cutting edges). A groove is designed on the rectangular positioning surface of the blade 5, and a corresponding boss is designed at the matching position on the tool body 1. In this way, the depth of thread locking during assembly can be increased, and the locking force of the blade 5 can be greatly improved, making the cutting more stable, thereby achieving the purpose of increasing the tool life and reducing the cost of the processing tool. It can be used in conjunction with the mirror tool body 1 (the tool of this embodiment can use the two diagonal cutting edges of the blade 5), and the other two cutting edges need to be used on its mirror tool body 1, that is, the reverse tool body 1, to improve the utilization rate of the blade 5. After the tool reaches the end of its life, only the blade 5 needs to be replaced, and the tool body 1 can be used all the time.

[0027] The blade 5 is designed to be: 1mm, 2mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 7.5mm, 8mm; wherein, the rectangular blade 5 with a thickness of 4mm to 6mm is the best.

[0028] During the processing and use of the utility model, only the frontmost cutting edge is involved in cutting. After the cutting edge reaches the end of its life, the blade 5 is rotated to the unused cutting edge at the diagonal angle by using a tool for installing the blade 5. After the two cutting edges are used, they are replaced with a new blade 5; the remaining two cutting edges on the blade 5 can be installed on the mirror image blade body 1 of the blade body 1, that is, used in the reverse blade body, so as to improve the utilization rate of the blade 5.

[0029] The above-mentioned blades and screws are prior art, and the technology not described is prior art, so they will not be repeated.

[0030] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A special outer diameter back cutter for lathe, comprising: The blade body has a positioning cabin arranged at the use end of the blade body, and a screw for fixing the blade; the characteristic is that the blade body is stepped; wherein the left end of the positioning cabin is a stepped groove concave downward, a rectangular boss is arranged in the middle of the groove, a threaded hole for fixing the blade is arranged in the middle of the boss, and the left and right sides of the top thereof are provided with a first empty blade groove and a second empty blade groove, and the first empty blade groove and the second empty blade groove are semicircular, and in order to prevent interference between the assembled blade and the blade body, the blade is tightened to the positioning cabin of the blade body in the middle by screws.

2. The lathe-specific outer diameter back cutter according to claim 1, characterized in that: The fixed end of the knife body is a 32mm×32mm square knife rod, which is welded or integrally formed and formed on one end of the stepped knife body.

3. The lathe-specific outer diameter back cutter according to claim 1, characterized in that: The positioning cabin is a concave three-step stepped rectangular groove, and the thickness of the stepped steps where the positioning cabin is located can be designed according to the size of the interference position to be processed; the overhang amount can be specifically adjusted according to the depth of the interference position to be processed.

4. The lathe-specific outer diameter back cutter according to claim 1, characterized in that: The blade is provided with a stepped groove which cooperates with the boss in the positioning cockpit of the blade body. When the blade is installed on the blade body, the blade cooperates with the positioning cockpit of the blade body and the screw is locked through the eccentric screw hole to make it fit tightly with the positioning surface of the positioning cockpit.

5. The lathe-specific outer diameter back cutter according to claim 1 or 4, characterized in that: The blades are formed by batch pressing and are designed to be rectangular blades with a thickness of 4 mm to 6 mm.

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