Machining method and machining device for lubricating guide pipe

Abstract

The invention discloses a machining method and a machining device for a lubricating guide pipe, which are characterized in that during rough machining of the lubricating guide pipe, 0.2 mm machining allowance is reserved at a part with a high precision requirement; a sleeve mold is prepared according to the outer diameter size of the connector and the outer diameter size of the guide rod; it is ensured that the guide rod can be inserted into the sleeve mold from the mounting opening, so that the axial inner wall of the connector is in face-to-face fit contact with the axial outer wall of the sleeve mold; low-temperature alloy liquid is poured from a pouring opening of the sleeve mold, and after the low-temperature alloy liquid is cooled and formed, the machining rigidity of the lubricating guide pipe can be improved, the cutter vibration phenomenon is eliminated, meanwhile, double tips are adopted for supporting the turning sealing groove, and the consistency of the clamping standard is guaranteed; and finally, the lubricating guide pipe is subjected to finish machining through double-tip supporting. According to the scheme, based on the structural characteristics of small size and light weight of the lubricating guide pipe, the machining rigidity of the lubricating guide pipe is improved by adopting an alloy liquid filling mode, so that the clamping benchmark of turning and grinding is unified, and the coaxiality requirement of a sealing groove and an outer circle on the lubricating guide pipe is effectively ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of shaft part processing, and in particular, to a processing method for a lubricating catheter. In addition, the present invention also relates to a processing device for the lubricating catheter for the above-mentioned processing method of the lubricating catheter. Background Art

[0002] The lubricating catheter is one of the important parts in the aero-engine reducer component. The structure of this part is a slender shaft (the total length is about 160 mm, and the minimum diameter is φ6 mm), with small size and light weight (about 100 grams), high requirements for dimensional accuracy and position accuracy, and great processing difficulty. Among them, as Figure 1 shown, the lubricating catheter is composed of a connector and a guide rod. The connector is provided with sealing grooves axially and radially respectively. The connector is arranged in a three-layer stepped manner, which are a positioning projection, an outer circle, and a tail boss in sequence along the axial direction. The connector is recessed radially with positioning grooves, and a plurality of positioning grooves are arranged at intervals along the axial direction. The guide rod is convex radially with positioning bosses for positioning. The coaxiality requirement of the bottom of the sealing groove to the outer circle of the connector is φ0.05 mm, and the coaxiality requirement of the tail boss to the outer circle is φ0.02 mm. The outer circle of the connector and the tail boss of the lubricating catheter must be processed by grinding with double center supports. However, due to the narrow sealing groove (2.6 mm - 3.8 mm) and the relatively large fillet radius (0.5 mm - 1 mm) at the bottom of the sealing groove, the grinding processing is extremely difficult, and the sealing groove is usually processed by numerical control turning.

[0003] However, the following problems exist in the turning processing of the sealing groove of the lubricating catheter: 1) Since the basic size of the lubricating catheter is small, when directly using double center supports to clamp the lubricating catheter for turning processing, the lubricating catheter has poor rigidity and serious chatter phenomenon, and it is difficult to guarantee the processing accuracy; 2) If the one-clamp-one-center method (clamping the largest outer circle of the lubricating catheter and the center supporting the axial side away from the largest outer circle) is used to clamp the lubricating catheter, it will be difficult to guarantee the coaxiality requirement of the bottom of the sealing groove to the outer circle due to the inconsistent clamping reference used in the turning processing and other parts of the grinding processing. And because the axial supporting surface is small when the lubricating catheter is tightened, there is a deformation of about 0.03 mm measured. Therefore, when the clamping reference is inconsistent, the coaxiality requirement is always difficult to guarantee.

[0004] Currently, for conventional slender shaft parts to eliminate the chatter phenomenon during processing, usually a bracket (center rest or other auxiliary devices) is added outside the part for support or high-strength materials are filled inside to improve the rigidity of the part.

[0005] For example, the stable support device for machining slender shaft workpieces with optimized middle stop disclosed in Chinese invention patent application CN119407564A, the screw shaft is connected to the bearing seat and the sleeve cylinder from back to front, the middle part of the body shell on the lower side of the sleeve cylinder is hinged with a lever, and the first support block and the second support block are respectively installed on the sleeve cylinder and the front end of the lever. The supporting working surfaces of the first support block and the second support block form an angle less than 90°, and the opening faces the direction of the cutting force, which offsets the radial cutting force on the slender shaft workpiece during machining, eliminates the deformation of the slender shaft workpiece under force, supports the workpiece and prevents it from retreating when subjected to cutting force, which can improve machining rigidity, stability and machining efficiency, effectively improve the grinding accuracy of equidistant arc surface slender shaft workpiece, and ensure that the dial indicator runout is within 0.005mm before and after clamping. It can adapt to the machining of slender shafts with high precision requirements, and can be used for turning, milling, grinding and other machining processes of equidistant arc surface slender shafts, and has good versatility and promotion value. That is, the processing rigidity is improved by supporting the parts externally through the center frame. However, when this support method is actually applied to the lubrication duct, the supporting part of the lubrication duct needs to be ground. However, the diameter of the lubrication duct is small and the length is short. After grinding, the position for support is very small. Only two or three positions can be selected for support, and it is difficult to ensure the processing rigidity. If multiple positions are selected for support, the size of the center frame needs to be set very small. In this way, not only can it not be tightly combined with the outer wall of the lubrication duct, but there is also the defect of insufficient stability of the center frame.

[0006] As disclosed in Chinese Patent Application for Invention CN111745168A, a method for controlling the machining deformation of the outer cylindrical surface of a thin-walled hollow slender shaft part includes the following steps: Step A, providing a mandrel with spiral grooves and filling rubber strips in the spiral grooves; Step B, inserting the mandrel obtained in Step A into the thin-walled hollow slender shaft part; Step C, installing the thin-walled hollow slender shaft part obtained in Step B on a lathe to complete the turning machining of the outer cylindrical surface of the thin-walled hollow slender shaft part. The method for controlling the machining deformation of the outer cylindrical surface of the thin-walled hollow slender shaft part provided by the present invention can complete the turning machining of the outer cylindrical surface of the part at one time, thus greatly improving the production efficiency. As disclosed in Chinese Patent Application for Invention CN111993172A, a method for machining a thin-walled blind hole shaft includes the following steps: Step A, preparing a positioning rod, a sleeve part and an airbag body according to the inner cavity profile of the thin-walled blind hole shaft part, where the positioning rod includes a detachable positioning head and a rod body part; Step B, assembling the positioning rod and the sleeve part; Step C, inserting the positioning rod connected with the sleeve part in Step B into the inner cavity of the thin-walled blind hole shaft part, inserting the positioning head into the blind hole to complete positioning, and then inflating through the inflation nozzle so that the airbag body expands to be in close contact with the inner cavity of the shaft body to form an internal support, thus completing the internal support of the thin-walled blind hole shaft part. The method for machining a thin-walled blind hole shaft provided by the present invention enhances the overall rigidity of the part and greatly improves the production efficiency. Both of the above two patent solutions adopt internal support for the part to improve the machining rigidity. However, when applied to a lubrication conduit, since the inner hole diameter of the lubrication conduit is only φ3mm, it is difficult to provide internal support for it, and it is also difficult to provide sufficient machining rigidity after internal support. Summary of the Invention

[0007] The present invention provides a machining method and a machining device for a lubrication conduit to solve the technical problems that when machining a sealing groove on a lubrication conduit with the existing machining solutions, the machining rigidity is poor, the tool chatter phenomenon is serious, or it is difficult to meet the coaxiality requirement between the sealing groove and the outer circle.

[0008] According to one aspect of the present invention, there is provided a processing method for a lubricating catheter. The lubricating catheter includes a connector and a guide rod. The outer diameter of the connector is greater than that of the guide rod, and the axial length of the connector is less than that of the guide rod. The method includes the following steps: S1, rough process the lubricating catheter, and leave a machining allowance of 0.2 mm on the outer circle, sealing groove, tail boss of the connector and the positioning boss of the guide rod; S2, prepare a sleeve mold according to the outer diameter size of the connector and the outer diameter size of the guide rod. Wherein, installation ports for inserting the guide rod and perfusion ports for pouring low-temperature alloy are respectively opened on both sides of the sleeve mold; S3, insert the guide rod into the sleeve mold from the installation port, so that the axial inner wall of the connector is in surface-to-surface contact with the axial outer wall of the sleeve mold; S4, pour low-temperature alloy liquid from the perfusion port of the sleeve mold; S5, after the low-temperature alloy liquid cools and forms, use double centers to support and turn the sealing groove; S6, melt and remove the low-temperature alloy, and take out the lubricating catheter from the sleeve mold; S7, use double centers to support and finish process the lubricating catheter.

[0009] As a further improvement of the above technical solution:

[0010] Further, in step S4, when the sleeve mold is pouring low-temperature alloy liquid, the inclination angle of the sleeve mold relative to the vertical plane is 10°-20°.

[0011] Further, in step S4, the temperature of the low-temperature alloy liquid is 200 °C higher than the melting point.

[0012] Further, the low-temperature alloy liquid is formed by heating a tin-bismuth alloy.

[0013] Further, step S1 specifically includes the following steps; S11, respectively open two coaxially arranged center holes at both axial ends of the lubricating catheter; S12, use double centers to support the lubricating catheter to grind the outer circle of the connector, and ensure that the runout of the outer circle of the connector relative to the center hole is within 0.005 mm; S13, use one chuck and one center to support the lubricating catheter to turn the guide rod in place, and leave a machining allowance of 0.2 mm at the positioning boss of the guide rod; S13, use double centers to support the lubricating catheter to check the runout of the outer circle of the connector relative to the positioning boss of the connector. If the runout is greater than 0.02 mm, grind the outer circle of the connector; S14, use grinding to process the connector to grind out the tail boss, and leave a machining allowance of 0.2 mm at the outer circle of the connector, the tail boss and the sealing groove.

[0014] Further, step S7 specifically includes the following steps: check the runout of the bottom of the sealing groove relative to the outer circle of the connector, ensure that the runout is not greater than 0.02 mm, and then use double centers to support the lubricating catheter to sequentially grind the outer circle of the positioning boss, the outer circle of the connector and the outer circle of the tail boss.

[0015] Further, in step S7, the steps of grinding the outer circle of the positioning boss are as follows: S71, draw marks around the outer circle of the positioning boss with a marker pen; S72, roughly grind the outer circle of the positioning boss until there are no marks on the outer circle of the positioning boss; S73, check the size of the outer circle of the positioning boss; S74, adjust the feed according to the size of the outer circle of the positioning boss; S75, check the size of the positioning boss and ensure that the size of the positioning boss is qualified.

[0016] According to another aspect of the present invention, there is also provided a processing device for a lubricating catheter, which is used for the processing method of the above-mentioned lubricating catheter. The processing device includes a sleeve mold and a plurality of limiting rods. Installation ports and perfusion ports are respectively opened at both axial ends of the sleeve mold. The sleeve mold is used to enclose a perfusion cavity with the lubricating catheter. The limiting rods are arranged along the radial direction of the sleeve mold, and the plurality of limiting rods are evenly spaced along the circumferential direction of the end of the sleeve mold close to the filling port.

[0017] As a further improvement of the above technical solution:

[0018] Further, the limiting rod includes a connecting convex portion extending radially into the perfusion cavity.

[0019] Further, the processing device further includes a sealing gasket for being disposed between the connecting head and the sleeve mold.

[0020] The present invention has the following beneficial effects:

[0021] In the processing method of the lubricating catheter of the present invention, when the lubricating catheter is rough processed, a machining allowance of 0.2 mm is left at the parts with high-precision requirements such as the outer circle of the connecting head, the sealing groove, the tail boss, and the positioning boss on the guide rod to ensure the machining accuracy of subsequent processing; prepare the sleeve mold according to the outer diameter size of the connecting head and the outer diameter size of the guide rod; ensure that the guide rod can be inserted into the sleeve mold from the installation port so that the axial inner wall of the connecting head is in surface-to-surface contact with the axial outer wall of the sleeve mold; pour low-temperature alloy liquid from the perfusion port of the sleeve mold. After the low-temperature alloy liquid cools and solidifies, use double centers to support and turn the sealing groove to realize the bonding connection between the low-temperature alloy and the matrix of the lubricating catheter and the matrix of the sleeve mold respectively, so as to improve the machining rigidity of the lubricating catheter, eliminate the tool chatter phenomenon, and ensure the consistency of the clamping reference; finally, use double centers to support and perform finish machining on the lubricating catheter to machine the outer circle of the connecting head, the tail boss, and the positioning boss on the guide rod in place; compared with the prior art, based on the structural characteristics of the lubricating catheter with small size and light weight, the method of pouring low-temperature alloy liquid is used to improve the machining rigidity of the lubricating catheter, so that the clamping references for turning and grinding are unified, and the coaxiality requirements of the sealing groove and the outer circle on the lubricating catheter can be effectively guaranteed. It has strong practicability and is suitable for wide promotion and application.

[0022] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The present invention will be further described in detail below with reference to the drawings. Description of the Drawings

[0023] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 is a schematic structural diagram of a lubricating catheter;

[0025] Figure 2 is a step block diagram of a processing method for a lubricating catheter according to a preferred embodiment of the present invention;

[0026] Figure 3 is a schematic cross-sectional view of a lubricating catheter processing device in use according to a preferred embodiment of the present invention.

[0027] Legend:

[0028] 100, sleeve mold; 110, perfusion cavity; 200, limiting rod; 210, connecting convex part. Detailed Embodiments

[0029] The following will describe the embodiments of the present invention in detail with reference to the drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0030] In the description of this application, it should be understood that the orientation or positional relationships indicated by terms such as "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end portion", "length", "outer end", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] In addition, in the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In this application, unless otherwise clearly specified and defined, terms such as "arranged", "socketed", "connected", "penetrated", "plugged in" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0034] As Figures 1 - 3 shown, the processing method of the lubricating catheter in this embodiment, the lubricating catheter includes a connector and a guide rod, the outer diameter of the connector is greater than the outer diameter of the guide rod, and the axial length of the connector is less than the axial length of the guide rod, and includes the following steps: S1, rough process the lubricating catheter, and leave a machining allowance of 0.2 mm on the outer circle, sealing groove, tail boss of the connector and the positioning boss of the guide rod; S2, prepare a sleeve mold 100 according to the outer diameter size of the connector and the outer diameter size of the guide rod, wherein, installation ports for inserting the guide rod and perfusion ports for pouring low-temperature alloy are respectively arranged on both sides of the sleeve mold 100; S3, insert the guide rod into the sleeve mold 100 from the installation port, so that the axial inner wall of the connector is in surface-to-surface contact with the axial outer wall of the sleeve mold 100; S4, pour low-temperature alloy liquid from the perfusion port of the sleeve mold 100; S5, after the low-temperature alloy liquid cools and forms, use double centers to support and turn the sealing groove; S6, melt and remove the low-temperature alloy, and take out the lubricating catheter from the sleeve mold 100; S7, use double centers to support and finish process the lubricating catheter.

[0035] As Figures 1 - 3As shown, specifically, in the processing method of the lubricating catheter of the present invention, when rough machining the lubricating catheter, a machining allowance of 0.2 mm is left at the parts with high-precision requirements such as the outer circle of the connector, the sealing groove, the tail boss, and the positioning boss on the guide rod to ensure the machining accuracy of subsequent processing; a sleeve mold 100 is prepared according to the outer diameter size of the connector and the outer diameter size of the guide rod; it is ensured that the guide rod can be inserted into the sleeve mold 100 from the installation port so that the axial inner wall of the connector is in surface-to-surface contact with the axial outer wall of the sleeve mold 100; low-temperature alloy liquid is poured into the sleeve mold 100 from the pouring port, and after the low-temperature alloy liquid cools and forms, the sealing groove is machined by supporting and turning with double centers, so as to realize the bonding connection of the low-temperature alloy with the lubricating catheter matrix and the sleeve mold 100 matrix respectively, improve the machining rigidity of the lubricating catheter, eliminate the chatter phenomenon, and ensure the consistency of the clamping reference; finally, the lubricating catheter is finely machined by supporting with double centers to machine the outer circle of the connector, the tail boss, and the positioning boss on the guide rod in place; compared with the prior art, based on the structural characteristics of the small size and light weight of the lubricating catheter, the machining rigidity of the lubricating catheter is improved by pouring low-temperature alloy liquid, so that the clamping references for turning and grinding are unified, and the coaxiality requirements of the sealing groove and the outer circle on the lubricating catheter can be effectively ensured. It has strong practicability and is suitable for wide promotion and application.

[0036] It should be understood that the maximum radial dimension of the installation port of the sleeve mold 100 should be greater than the outer diameter of the guide rod but less than the outer diameter of the positioning protrusion on the connector.

[0037] It should be understood that based on the small size of the lubricating catheter, the amount of low-temperature alloy liquid used is relatively small, so as not to increase too much processing cost while ensuring the processing quality.

[0038] It should be understood that the low-temperature alloy liquid in this embodiment is obtained by heating the low-temperature alloy, and the low-temperature alloy refers to an alloy with a low melting point.

[0039] It should be understood that the mixing ratio of the low-temperature alloy liquid is a physical mixture and can be reused, further reducing the processing cost.

[0040] It should be understood that in this embodiment, the axial direction, the radial direction, and the circumferential direction are all based on the axial direction, the radial direction, and the circumferential direction of the lubricating catheter.

[0041] In this embodiment, in step S4, when the sleeve mold 100 is filled with the low-temperature alloy liquid, the inclination angle of the sleeve mold 100 relative to the vertical plane is 10°-20°. Specifically, when the low-temperature alloy liquid is filled into the sleeve mold 100 and the inclination angle of the sleeve mold 100 relative to the vertical plane is between 10° and 20°, the low-temperature alloy liquid will flow along the inner wall of the sleeve mold 100, which can effectively avoid the danger of scalding caused by the splashing of the low-temperature alloy liquid, and can also make the low-temperature alloy liquid flow into the bottom of the sleeve mold 100 as soon as possible, improving the pouring efficiency; when the low-temperature alloy liquid is filled into the sleeve mold 100 and the inclination angle of the sleeve mold 100 relative to the vertical plane is less than 10°, the low-temperature alloy liquid may directly fall to the bottom of the sleeve mold 100, and there may be dangers such as splashing and scalding due to the impact force; when the low-temperature alloy liquid is filled into the sleeve mold 100 and the inclination angle of the sleeve mold 100 relative to the vertical plane is greater than 20°, the flow rate of the low-temperature alloy liquid is slow and the pouring efficiency is low.

[0042] It should be understood that when filling the low-temperature alloy liquid into the sleeve mold 100, the connecting head of the lubricating guide rod is downward and the pouring port is upward, so as to use gravity to naturally fill the inner cavity of the sleeve mold 100 with the low-temperature alloy liquid.

[0043] In this embodiment, in step S4, the temperature of the low-temperature alloy liquid is 200°C higher than the melting point. Specifically, the melting point refers to the melting point of the low-temperature alloy. By making the temperature of the low-temperature alloy liquid 200°C higher than the melting point of the low-temperature alloy, it is possible to avoid a large number of bubbles or undercasting being formed due to the too-fast cooling of the low-temperature alloy liquid after it is poured into the sleeve mold 100, resulting in too poor bonding force between the low-temperature alloy and the lubricating conduit, and thus being unable to effectively improve the processing rigidity of the lubricating conduit.

[0044] In this embodiment, the low-temperature alloy liquid is formed by heating a tin-bismuth alloy. Specifically, the melting point of the tin-bismuth alloy is about 138°C - 170°C, which is easy to be heated into a molten state, has small shrinkage during cooling, and has high matrix strength after cooling, which is beneficial to improving the processing rigidity of the lubricating conduit, thereby improving the processing quality of the lubricating conduit.

[0045] Optionally, in another embodiment, the low-temperature alloy liquid is formed by heating a zinc-based alloy or Wood's alloy.

[0046] Optionally, both the pouring of the low-temperature alloy liquid in step S4 and the melting and removal of the low-temperature alloy in step S6 should be carried out in a fire-proof and explosion-proof room to ensure safety during processing.

[0047] In this embodiment, step S1 specifically includes the following steps: S11, respectively open two coaxially arranged central holes at both axial ends of the lubricating catheter; S12, support the lubricating catheter with double centers to grind the outer circle of the connector, and ensure that the runout of the outer circle of the connector relative to the central hole is within 0.005 mm; S13, support the lubricating catheter with one chuck and one center to turn the guide rod in place, and leave a machining allowance of 0.2 mm at the positioning boss on the guide rod; S13, support the lubricating catheter with double centers, check the runout of the outer circle of the connector relative to the positioning boss of the connector, if the runout is greater than 0.02 mm, then grind the outer circle of the connector; S14, use grinding to process the connector to grind out the tail boss, and leave a machining allowance of 0.2 mm at the outer circle of the connector, the tail boss and the sealing groove.

[0048] In this embodiment, step S7 specifically includes the following steps: Check the runout of the bottom of the sealing groove relative to the outer circle of the connector, ensure that the runout is not greater than 0.02 mm, and then support the lubricating catheter with double centers to sequentially grind the outer circle of the positioning boss, the outer circle of the connector and the outer circle of the tail boss.

[0049] In this embodiment, in step S7, the steps of grinding the outer circle of the positioning boss are as follows: S71, draw marks around the outer circle of the positioning boss with a marker pen; S72, rough grind the outer circle of the positioning boss until there are no marks on the outer circle of the positioning boss; S73, check the size of the outer circle of the positioning boss; S74, adjust the feed according to the size of the outer circle of the positioning boss; S75, check the size of the positioning boss and ensure that the size of the positioning boss is qualified.

[0050] It should be understood that the steps of grinding the outer circle of the connector and grinding the outer circle of the tail boss are the same as or similar to the steps of grinding the outer circle of the positioning boss, so they will not be elaborated here.

[0051] Optionally, step S5 further includes the step of: after the low-temperature alloy liquid is cooled and formed, clean the center holes at both axial ends of the lubricating catheter to ensure that there is no excess debris and ensure the clamping reliability of the double-center support.

[0052] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0053] Such as Figure 3As shown in the figure, the processing device for the lubricating catheter in this embodiment is used for the above-mentioned processing method of the lubricating catheter. The processing device includes a sleeve mold 100 and a plurality of limiting rods 200. Installation ports and perfusion ports are respectively provided at both axial ends of the sleeve mold 100. The sleeve mold 100 is used to enclose with the lubricating catheter to form a perfusion cavity 110. The limiting rods 200 are arranged along the radial direction of the sleeve mold 100, and the plurality of limiting rods 200 are evenly arranged at intervals along the circumference of the end of the sleeve mold 100 close to the filling port.

[0054] As Figure 3 shown, specifically, after the sleeve mold 100 is fixed by cooperating with a fixture through a plurality of limiting rods 200, the guide rod of the lubricating catheter extends into the perfusion cavity 110 along the installation port, and then low-temperature alloy liquid is poured into the perfusion cavity 110 through the perfusion port. After the low-temperature alloy liquid cools and forms, the sleeve mold 100 is transported to the turning workshop by the plurality of limiting rods 200 to perform turning processing on the sealing groove. After the sealing groove processing is completed, the sleeve mold 100 is moved by the plurality of limiting rods 200 to melt and remove the low-temperature alloy. During the melting and removal, the connector of the lubricating catheter faces upward so that the lubricating catheter can be taken out in time when the low-temperature alloy starts to melt.

[0055] It should be understood that the limiting rod 200 is also beneficial to drive the sleeve mold 100 to rotate, and then drive the lubricating catheter to rotate, so as to facilitate turning the sealing groove.

[0056] Preferably, the number of the limiting rods 200 is four.

[0057] Optionally, grooves for increasing friction are arranged on the inner wall surface of the sleeve mold 100 to increase the bonding force between the low-temperature alloy and the sleeve mold 100, thereby being beneficial to improving the processing rigidity of the lubricating catheter.

[0058] As Figure 3 shown, in this embodiment, the limiting rod 200 includes a connecting convex part 210 extending radially into the perfusion cavity 110. Specifically, the sleeve mold 100 and the plurality of limiting rods 200 are integrally formed into an integral structure, and the connecting convex part 210 extends into the perfusion cavity 110. After the low-temperature alloy liquid in the perfusion cavity 110 cools, the bonding area between the processing device and the low-temperature alloy is increased to improve the bonding force between the low-temperature alloy and the sleeve mold 100, thereby being beneficial to improving the processing rigidity of the lubricating catheter.

[0059] In this embodiment, the processing device further includes a sealing gasket arranged between the connector and the sleeve mold 100. Specifically, the sealing performance between the connector and the sleeve mold 100 is increased through the sealing gasket to prevent the low-temperature alloy liquid from leaking between the connector and the sleeve mold 100.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A processing method for a lubricating catheter, the lubricating catheter comprising a connector and a guide rod, the outer diameter of the connector being greater than the outer diameter of the guide rod, and the axial length of the connector being less than the axial length of the guide rod, characterized in that, It includes the following steps: S1. Rough-machine the lubricating conduit, and leave a machining allowance of 0.2 mm on the outer circle of the connector, the sealing groove, the tail boss, and the positioning boss on the guide rod. S2. Prepare a sleeve mold (100) according to the outer diameter dimension of the connector and the outer diameter dimension of the guide rod. Among them, mounting openings for inserting the guide rod and pouring ports for pouring low-temperature alloy are respectively formed on both sides of the sleeve mold (100). S3. Insert the guide rod into the sleeve mold (100) from the mounting opening, so that the axial inner wall of the connector is in surface-to-surface contact with the axial outer wall of the sleeve mold (100). S4. Pour low-temperature alloy liquid into the sleeve mold (100) from the pouring port. S5. After the low-temperature alloy liquid cools and forms, use double centers to support and turn the sealing groove. S6. Melt and remove the low-temperature alloy, and take out the lubricating conduit from the sleeve mold (100). S7. Use double centers to support and finish-machine the lubricating conduit.

2. The processing method of the lubricating catheter according to claim 1, characterized in that, In step S4, when pouring the low-temperature alloy liquid into the sleeve mold (100), the inclination angle of the sleeve mold (100) relative to the vertical plane is 10°-20°.

3. The processing method of the lubricating catheter according to claim 1, characterized in that, In step S4, the temperature of the low-temperature alloy liquid is 200 °C higher than the melting point.

4. The processing method of the lubricating catheter according to claim 1, characterized in that, The low-temperature alloy liquid is formed by heating a tin-bismuth alloy.

5. The processing method of the lubricating catheter according to any one of claims 1-4, characterized in that, Step S1 specifically includes the following steps: S11. Respectively form two coaxially arranged center holes at both axial ends of the lubricating conduit. S12. Use double centers to support the lubricating conduit to grind the outer circle of the connector, and ensure that the runout of the outer circle of the connector relative to the center hole is within 0.005 mm. S13. Use one chuck and one center to support the lubricating conduit to turn the guide rod in place, and leave a machining allowance of 0.2 mm at the positioning boss on the guide rod. S13. Use double centers to support the lubricating conduit to check the runout of the outer circle of the connector relative to the positioning boss of the connector. If the runout is greater than 0.02 mm, grind the outer circle of the connector. S14. Use grinding to machine the connector to grind out the tail boss, and leave a machining allowance of 0.2 mm on the outer circle of the connector, the tail boss, and the sealing groove.

6. The processing method of the lubricating catheter according to any one of claims 1-4, characterized in that, Step S7 specifically includes the following steps: Check the runout of the bottom of the sealing groove relative to the outer circle of the connector, ensure that the runout is not greater than 0.02 mm, and then use double centers to support the lubricating conduit to successively grind the outer circle of the positioning boss, the outer circle of the connector, and the outer circle of the tail boss.

7. The processing method of the lubricating catheter according to claim 6, characterized in that, In step S7, the steps of grinding the outer circle of the positioning boss are as follows: S71. Use a marker pen to draw marks around the outer circle of the positioning boss. S72. Rough-grind the outer circle of the positioning boss until there are no marks on the outer circle of the positioning boss. S73. Check the size of the outer circle of the positioning boss. S74. Adjust the feed according to the size of the outer circle of the positioning boss. S75. Check the size of the positioning boss and ensure that the size of the positioning boss is qualified.

8. A processing device for a lubricating catheter, characterized in that, A processing method for the lubricating catheter according to any one of claims 1-7, the processing device comprising a sleeve mold (100) and a plurality of limiting rods (200). Installation ports and perfusion ports are respectively formed at two axial ends of the sleeve mold (100). The sleeve mold (100) is used to enclose with the lubricating catheter to form a perfusion cavity (110). The limiting rods (200) are arranged along the radial direction of the sleeve mold (100), and the plurality of limiting rods (200) are evenly arranged at intervals along the circumferential direction of the end of the sleeve mold (100) close to the filling port).

9. The processing method of the lubricating catheter according to claim 8, characterized in that, The limiting rod (200) includes a connecting convex portion (210) extending radially into the perfusion cavity (110).

10. The processing method of the lubricating catheter according to claim 8, characterized in that, The processing device further includes a sealing gasket for being disposed between the connecting head and the sleeve mold (100).

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