A method for machining a head crescent boss of a pin shaft structure jaw forceps

Abstract

The application discloses a kind of head crescent boss processing methods of pin shaft structure bite cutting forceps, comprising the following steps: (1) the head of bite cutting bite cutting forceps is aged hardening;(2) the lower forceps tube of bite cutting forceps is clamped on five-axis engraving machine;(3) whether workpiece clamping on tool is in place is detected;(4) detection end mill, run program, carry out roughing to blank;(5) detection T-shaped milling cutter I, the wear condition of tool is detected in machine using tool detector, whether tool wear exceeds limit value is judged, if exceeding tool wear, machine tool automatically alarms, prompts operator to replace tool;(6) run program, outer circular surface is processed using T-shaped milling cutter I, (7) tool is replaced for T-shaped milling cutter II, T-shaped milling cutter II is detected again, and detection steps are as in step (5);(8) run program, inner circular surface is processed using T-shaped milling cutter II.The method can be processed crescent structure at a time, guarantee processing efficiency, precision and stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, more particularly to a head crescent boss machining method of a pin shaft structure-free bite cutting forceps. BACKGROUND

[0002] The bite cutting forceps are mainly used for repairing meniscus of knee joints, and meniscus injury is the most common orthopedic disease in knee joint sports trauma, and the surgical treatment is relatively difficult due to the complex anatomical position and large individual variation. At present, with the gradual development of arthroscopic technology in the clinic, arthroscopic surgery has the advantages of small trauma, clear vision and fast postoperative recovery, and is gradually becoming one of the main surgical methods for treating meniscus injury. The bite cutting forceps are indispensable surgical instruments in meniscus shaping surgery.

[0003] The head of the bite cutting forceps is made of 455 stainless steel, and the plasticity and toughness of 455 material are very large. Under high temperature and high pressure, the affinity of stainless steel with other metals is strong, and adhesion phenomenon is easy to occur, and accumulation nodules are formed, which not only aggravates tool wear, but also causes tearing phenomenon and makes the machined surface deteriorate. The affinity effect in the process of cutting stainless steel will cause adhesion and diffusion between the tool and the cutting surface, resulting in adhesive wear and diffusion wear of the tool, and the tool rake face will form a crescent depression, and the cutting edge will also form a small flake and a gap. In addition, the hardness of the carbide such as TiC particle in the stainless steel is very high, which directly contacts and rubs with the tool during cutting, scratches the tool, and also has work hardening phenomenon, which all aggravates tool wear.

[0004] Moreover, the crescent structure on the head of the bite cutting forceps has annular grooves and protrusions on the left and right sides, and the crescent structure is complex, small in size, high in cooperation precision, and difficult to process. When the existing technology is processed, the crescent structure obtained by the segmented processing method will cause deviation in the size and coaxiality of the left and right annular structures, and the cooperation of the forceps head after installation is not firm, which cannot meet the bite cutting demand. SUMMARY

[0005] Therefore, the present application provides a head crescent structure machining method of a pin shaft structure-free bite cutting forceps, which can complete the machining of the crescent structure at one time, and ensure the machining efficiency, precision and stability.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The head of the bite cutting forceps is provided with a window, and the two side walls of the window are provided with crescent bosses protruding inward in a semicircular shape; the two bosses are concentric arcs; and the center line of the two bosses is a center line;

[0008] The head crescent boss machining method of the pin shaft structure-free bite cutting forceps comprises the following steps:

[0009] The head of the cutting forceps is age hardened, and the heat treatment temperature is 480-500 DEG C;

[0010] Before machining the boss, the head of the 455 stainless steel cutting forceps is age hardened, and the heat treatment temperature is 480-500 DEG C, which can increase the hardness of the head of the cutting forceps. On the one hand, the adhesion to the tool is small during machining, prolonging the service life of the tool; on the other hand, the boss is movably connected with the upper forceps head, and the wear of the head of the cutting forceps is large, so that the hardness of the head of the cutting forceps is increased, the wear resistance of the boss is improved, and the service life of the cutting forceps is further improved. The residual stress in the material processing after age hardening is small, and the deformation is not easy;

[0011] (2) clamping the workpiece, clamping the lower forceps pipe of the cutting forceps on the five-axis engraving machine;

[0012] (3) detecting the workpiece, detecting whether the clamping of the workpiece on the tool is in place;

[0013] (4) detecting the end mill, running the program, and rough machining the head of the lower forceps pipe to form the window;

[0014] (5) detecting the T-shaped milling cutter I, using the tool detector to detect the wear of the tool in the machine, and judging whether the tool wear exceeds the limited value, if the tool wear exceeds the limited value, the machine automatically alarms, prompting the operator to replace the tool;

[0015] (6) running the program, machining the outer arc surface,

[0016] (7) replacing the tool with the T-shaped milling cutter II, and detecting the T-shaped milling cutter II again, the detection steps being as shown in step (5);

[0017] (8) running the program, machining the inner arc surface;

[0018] The T-shaped milling cutter I and the T-shaped milling cutter II comprise a cutting part, a connecting part and a rod part; the top end of the rod part is a circular truncated cone, the connecting part is arranged at the center of the top end of the rod part; the cutting part is connected with the rod part through the connecting part; and the cutting part and the rod part form an inverted T shape.

[0019] The five-axis engraving machine is used to clamp the workpiece once to complete the machining of the outer arc surface and the inner arc surface of the boss, and the T-shaped milling cutter is used to machine the inner and outer arc surfaces. The advantages of one-time machining are that the machining cost is reduced, the consistency of the function and the size is good, and the assembly position gap of the upper and lower forceps is less than 5 microns. In addition, the in-machine detection system can realize the corner compensation of the edge machining tool and the online compensation of the ball cutter contour deviation, and the tool can be directly matched after being taken out of the machine.

[0020] Preferably, the rotation axis of the T-shaped milling cutter I coincides with the center line during machining of the outer arc surface;

[0021] The rotating axis of the T-shaped milling cutter II coincides with the center line when machining the inner arc surface.

[0022] Preferably, the boss thickness is 0.6 mm; the distance between the two bosses is 0.55 mm.

[0023] Preferably, the machining method further comprises a polishing treatment.

[0024] In the machining, a special polishing fiber wheel is used to polish the boss part.

[0025] In order to improve the smoothness of the crescent part, a special polishing fiber wheel is used to polish the boss part in the machining, so as to remove burrs and sharp edges and reduce roughness.

[0026] Preferably, the machining method further comprises using fluid grinding to clean burrs generated in the machining process.

[0027] In order to reduce the difficulty in machining this part due to the small feature, ordinary mechanical polishing cannot remove burrs and reduce roughness from 1.6 μm to 0.8 μm, fluid grinding is considered to process this position. Roughness from 1.6 μm to 0.8 μm will greatly improve the smoothness when the parts are matched with each other; at the same time, due to the reduction of roughness, the storage of residual liquid on the boss surface is reduced, and the corrosion risk caused by high temperature and high pressure sterilization of the product is reduced.

[0028] According to the above technical solution, compared with the prior art, the present application has the following beneficial effects:

[0029] The machining result of the method of the present application is that: the assembly position gap of the upper and lower jaws is less than 5 μm; the in-machine detection system is used to realize the corner compensation of the blade edge finishing tool and the online compensation of the ball cutter contour deviation, and the product can be directly matched after being taken off the machine.

[0030] The product produced by using the machining method has stable size and good structural consistency; the workpiece is clamped once, avoiding the error caused by multiple clamping; the waste rate is low during product manufacturing; the tool wear is small; the product quality is improved, and the production cost of the product is reduced. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0032] Figure 1 It is a whole structure diagram of the pin shaft structure of the present application.

[0033] Figure 2 It is the enlarged structural view of the head of the pin shaft structure of the cutting forceps of the application;

[0034] Figure 3 It is the structure view of the crescent boss of the lower pipe of the cutting forceps of the application;

[0035] Figure 4 It is the clamping schematic view of the five-axis engraving machine;

[0036] Figure 5 It is the processing schematic view of the end mill;

[0037] Figure 6 It is the schematic view of the inner arc surface of the T-shaped milling cutter II counterclockwise cutting;

[0038] Figure 7 It is the structure view of the T-shaped milling cutter I and T-shaped milling cutter II;

[0039] Figure 8 It is the working state schematic view of the end mill;

[0040] Figure 9 It is the structure view of the fiber wheel;

[0041] Figure 10 It is the partial sectional view of the head of the pin shaft structure of the cutting forceps of the application;

[0042] In the figure, the following are:

[0043] 1-upper jaw pipe of the cutting forceps; 2-lower pipe of the cutting forceps; 3-outer arc surface; 4-inner arc surface; 5-crescent boss; 6-cutting part; 7-connection part; 8-handle; 9-head of the fiber wheel; 10-rod part of the fiber wheel. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application. Embodiment 1

[0045] The embodiment provides a crescent basket structure processing method for the head of the pin shaft structure of the cutting forceps.

[0046] The head of the lower pipe of the cutting forceps is provided with a window, and the two side walls of the window are both provided with a crescent boss protruding inward in a semicircle shape; the two crescent bosses are concentric arcs; and the center lines of the two crescent bosses are the center line;

[0047] The head crescent boss processing method of the pin-free shaft structure nipping forceps comprises the following steps:

[0048] (1) aging hardening the head of the nipping forceps, heat treatment temperature 480-500℃;

[0049] (2) clamping the workpiece, clamping the lower forceps tube of the nipping forceps on the five-axis engraving machine;

[0050] (3) detecting the workpiece, detecting whether the workpiece is clamped in place on the tooling;

[0051] (4) detecting the end mill, running the program, and roughing the blank;

[0052] (5) detecting the T-shaped milling cutter I, using the cutter detector to detect the wear of the cutter in the machine, judging whether the cutter wear exceeds the limit value, if the cutter wear exceeds the limit value, the machine automatically alarms and prompts the operator to replace the cutter;

[0053] (6) running the program, using the T-shaped milling cutter I to process the outer circular surface,

[0054] (7) replacing the cutter with the T-shaped milling cutter II, and detecting the T-shaped milling cutter II, the detection steps being as in step (5);

[0055] (8) running the program, using the T-shaped milling cutter II to process the inner circular surface;

[0056] The T-shaped milling cutter I and the T-shaped milling cutter II comprise a cutting part, a connecting part and a rod part; the top end of the rod part is a conical frustum, the connecting part is arranged at the center of the top end of the rod part; the cutting part is connected with the rod part through the connecting part; the cutting part and the rod part form an inverted T shape.

[0057] Wherein, the rotation axis of the T-shaped milling cutter I coincides with the center line when processing the outer circular surface.

[0058] The rotation axis of the T-shaped milling cutter II coincides with the center line when processing the inner circular surface.

[0059] The thickness of the boss is 0.6mm; the distance between the two bosses is 0.55mm.

[0060] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method part.

[0061] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for processing the crescent boss of the head of a pinless structure bite forceps, characterized in that, the head of the lower forceps tube of the bite forceps is provided with a window, and the two side walls of the window are each provided with a semicircular crescent boss protruding inward; the two bosses are concentric circular arcs; and the line connecting the centers of the two bosses is the center line; the method for processing the crescent boss of the head of the pinless structure bite forceps comprises the following steps: (1) aging hardening the head of the bite forceps, with a heat treatment temperature of 480-500℃; (2) clamping the workpiece, and clamping the lower forceps tube of the bite forceps on a five-axis engraving machine; (3) detecting the workpiece to check whether the clamping of the workpiece on the tooling is in place; (4) detecting the end mill, running the program, and performing rough machining on the blank lower forceps tube head to form the window; (5) detecting the T-shaped milling cutter I, using a tool detector to detect the wear of the cutter on the machine, and determining whether the cutter wear exceeds the limit value; if the cutter wear exceeds the limit value, the machine automatically alarms and prompts the operator to replace the cutter; (6) running the program, and processing the outer circular surface with the T-shaped milling cutter I, (7) replacing the cutter with the T-shaped milling cutter II, and detecting the T-shaped milling cutter II, with the detection steps being as in step (5); (8) running the program, and processing the inner circular surface with the T-shaped milling cutter II; the T-shaped milling cutter I and the T-shaped milling cutter II each comprise a cutting part, a connecting part, and a rod part; the top end of the rod part is a circular conical platform, the connecting part is arranged at the center of the top end of the rod part, the cutting part is connected to the rod part through the connecting part, and the cutting part and the rod part form an inverted T shape; the rotation axis of the T-shaped milling cutter I coincides with the center line when processing the outer circular surface; the rotation axis of the T-shaped milling cutter II coincides with the center line when processing the inner circular surface.

2. The method according to claim 1, wherein the head of the pinless snap action forceps is a crescent boss. The thickness of the boss is 0.6mm, and the distance between the two bosses is 0.55mm. ​ 3. The method of claim 1, wherein the head of the pinless snap action forceps is a crescent boss. Further comprising: polishing treatment; during processing, the boss part is polished by a polishing fiber wheel.

4. The method for machining the crescent-shaped boss on the head of a pinless biting pliers according to claim 3, characterized in that, Further comprising: adopting fluid grinding to clean the burrs generated during processing.

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