Processing method of water pump integrated heating water pipe and combined tool used therein

Abstract

The present invention discloses a method for processing a water pump integrated hot water pipe and a combined tool used therefor. The method is simple and efficient. The hot water pipe embryo is first integrally formed on a water pump housing and then placed in a CNC machining center. The combined tool is rotated on the hot water pipe embryo non-axially so that the combined tool can rotate in situ to form the fine structure of the hot water pipe at one time. The combined tool does not need to be replaced during the machining process, which not only greatly improves the machining efficiency, but also greatly improves the machining accuracy. The product consistency is good and the work error is small, which solves the machining problem of the integrated hot water pipe and greatly improves the freedom of the position and structural design of the hot water pipe, while overcoming the problem of insufficient reliability of independent hot water pipes.

Description

Technical Field

[0001] The invention relates to the technical field of water pump processing, and in particular to a method for processing an integrated water heating pipe of a water pump and a combined tool used therefor. Background Art

[0002] The automobile water pump is used to pump out the hot water in the engine cylinder water channel and pump the cold water into the engine cylinder water channel. The existing warm water pipe is usually installed on the water pump housing as an independent component, which not only has the problem of component matching, but also has the risk of puncture leakage after long-term use, and the service life cannot meet user needs.

[0003] Therefore, in order to solve the above problems, the applicant plans to integrally mold the warm water pipe on the water pump housing. However, the existing process cannot well integrally mold the warm water pipe on the water pump housing, especially cannot accurately process the tensioning flange of the warm water pipe for auxiliary sealing and connection, the smooth outer wall of the warm water pipe for connecting the water pipe, and the limiting boss profile for matching sealing and positioning.

[0004] If the hot water pipe embryo is integrally formed on the water pump housing first, it will need to be reprocessed later to meet the use standards. However, if the hot water pipe embryo is processed by a lathe according to the existing technology, not only the special-shaped structure of the water pump housing makes it impossible to reliably clamp and position the water pump housing as required (usually there are strict requirements on the orientation of the hot water pipe embryo), which affects the processing accuracy; but also due to the limited lathe processing freedom and the complex structure of the water pump housing surface, there is a narrow space between the hot water pipe embryo and the water pump housing, which makes it difficult for the lathe to cut, which not only seriously affects the processing efficiency, but also limits the design of the position and structure of the hot water pipe.

[0005] Solving the above problems has become a top priority. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a method for processing a water pump integrated heating water pipe and a combined tool used therein.

[0007] The technical solution is as follows:

[0008] A method for processing a water pump integrated heating water pipe, the key points of which are to follow the following steps:

[0009] S1. A warm water pipe embryo is integrally formed on the water pump housing;

[0010] S2. Clamp and fix the water pump housing on the fixture of the machining center, and install the combined tool on the spindle of the machining center;

[0011] S3, driving the cutter head of the combined cutter to cover the warm water pipe embryo, so that the warm water pipe embryo is embedded in the cutter head, and the rotation axis of the cutter head is parallel to the central axis of the warm water pipe embryo;

[0012] S4, driving the combined cutter to rotate, and processing the hot water pipe embryo into a hot water pipe;

[0013] S5, driving the cutter head of the combined tool to separate from the warm water pipe, and removing the water pump housing from the fixture of the machining center;

[0014] Among them, the outer circumferential surface of the warm water pipe is provided with a limiting boss and a tensioning flange, the side wall of the limiting boss close to the tensioning flange is a planar structure, the outer circumferential surface of the tensioning flange is an arc-shaped structure, the outer wall of the warm water pipe between the limiting boss and the tensioning flange is a cylindrical structure, and the combined tool forms the outer wall of the warm water pipe, the outer circumferential surface of the tensioning flange and the side wall of the limiting boss close to the tensioning flange at one time by rotating.

[0015] Using the above method, the hot water pipe embryo is first integrally formed on the water pump housing, and then placed in the CNC machining center. The combined tool is rotated on the hot water pipe embryo non-axially, so that the combined tool can rotate in situ to form the fine structure of the hot water pipe at one time. The combined tool does not need to be changed during the machining process, which not only greatly improves the machining efficiency, but also greatly improves the machining accuracy. The product consistency is good and the work error is small, which solves the machining problem of the integrated hot water pipe and greatly improves the freedom of the position and structural design of the hot water pipe, while overcoming the problem of insufficient reliability of independent hot water pipes.

[0016] A combined tool, the main points of which are: comprising a tool handle and a tool head integrally formed at the outer end of the tool handle, wherein the end surface of the tool head away from the tool handle is recessed to form a processing cavity with a cylindrical structure, the bottom of the processing cavity wall is circumferentially provided with a plurality of flange cutting edges, the middle of the processing cavity wall is circumferentially provided with a plurality of outer wall cutting edges, and the upper part of the processing cavity wall is circumferentially provided with a plurality of multifunctional cutting edges;

[0017] Each multifunctional cutting edge has a limiting boss end face cutting edge protruding from the end face of the cutter head at one end away from the bottom of the processing cavity, and the limiting boss end face cutting edge is used to form a side wall of the limiting boss close to the tensioning flange, and each multifunctional cutting edge has a tube wall upper section cutting edge along the side edge of the cutter head protruding inwardly from the wall of the processing cavity in the radial direction of the cutter head;

[0018] Each flange cutting edge protrudes radially inward from the side edge of the processing cavity wall along the cutter head and has a tensioning flange cutting edge and a tube wall lower section cutting edge, wherein the tensioning flange cutting edge is located at one end of the tube wall lower section cutting edge close to the processing cavity bottom;

[0019] Each outer wall cutting edge protrudes radially inward from the side edge of the processing cavity wall along the cutter head and has a tube wall middle section cutting edge;

[0020] The upper cutting edge, middle cutting edge and lower cutting edge of each pipe wall are all straight line structures and have the same protruding height so as to jointly form the outer wall of the warm water pipe. The cutting edge of each tensioning flange is an arc structure that is concave radially outward along the cutter head and is used to form the outer peripheral surface of the tensioning flange.

[0021] By adopting the above structure, the combined tool can rotate non-axially on the hot water pipe blank, so that the combined tool can rotate in situ to form the fine structures of the outer wall of the hot water pipe, the outer peripheral surface of the tensioning flange, and the side wall of the limiting boss close to the tensioning flange at one time. The combined tool does not need to be replaced during the processing, which not only greatly improves the processing efficiency, but also greatly improves the processing accuracy. The product consistency is good and the work difference is small, which solves the processing problem of the one-piece hot water pipe. At the same time, compared with the single cutting edge cutting, the upper cutting edge of the pipe wall and the lower cutting edge of the pipe wall are used to assist the middle cutting edge of the pipe wall to cut and form the outer wall of the hot water pipe, which greatly reduces the cutting difficulty, not only prolongs the life of the cutting edge, but also improves the cutting efficiency.

[0022] Preferably, there are four flange cutting edges, which are distributed in a cross shape. The tensioning flange cutting edges of any two opposite flange cutting edges have the same structure, and the recessed depths of two of the opposite tensioning flange cutting edges are greater than the recessed depths of the other two opposite tensioning flange cutting edges. With the above structure, the two oppositely arranged tensioning flange cutting edges with larger recessed depths are rough machining cutting edges, and the two oppositely arranged tensioning flange cutting edges with smaller recessed depths are fine machining cutting edges. With such a design, the rough machining cutting edge can share the cutting pressure of the fine machining cutting edge, which not only effectively protects the fine machining cutting edge, but also effectively improves the cutting efficiency. At the same time, even if the rough machining cutting edge is worn, as long as the fine machining cutting edge is intact, it will not affect the use of the combined tool, which effectively extends the maintenance period and replacement frequency of the combined tool.

[0023] As a preference: the flange cutting edge protrudes inwardly from the side edge of the processing cavity wall along the radial direction of the cutter head, and has an inwardly protruding positioning protrusion, the positioning protrusion is located at the end of the tensioning flange cutting edge away from the cutting edge of the lower section of the pipe wall, and the surface of the positioning protrusion on one side close to the tensioning flange cutting edge is inclined outward from the end of the tensioning flange cutting edge toward the bottom of the processing cavity. With the above structure, the inclined design can avoid the hot water pipe embryo, reduce friction, and improve cutting efficiency.

[0024] As a preferred embodiment, the inclination angle of the surface of the positioning protrusion close to the tension flange edge is 5°. The above structure can not only achieve the avoidance effect, but also more reliably support and position the hot water pipe embryo, ensure the processing stability, and reduce the work error.

[0025] As a preferred embodiment, there is a rounded corner between the tension flange cutting edge and the positioning protrusion, and there is a rounded corner between the cutting edge of the lower section of the tube wall and the tension flange cutting edge. With the above structure, the transition position of the product surface is smoother and easier to assemble.

[0026] Preferably, there are two outer wall cutting edges, which are arranged opposite to each other, and there are two multifunctional cutting edges, which are arranged opposite to each other, and the two outer wall cutting edges and the two multifunctional cutting edges are distributed in a cross shape in space. The above structure can effectively improve the processing efficiency while taking into account the processing difficulty and manufacturing cost of the combined tool.

[0027] Preferably, the wall of the machining cavity is provided with a plurality of chip removal openings penetrating to the outer wall of the cutter head, and each flange cutting edge, outer wall cutting edge and multifunctional cutting edge are respectively arranged on the inner side of the corresponding chip removal opening. The above structure can efficiently remove chips and improve machining efficiency.

[0028] Preferably, the projection of the upper end of the cutting edge of the middle section of the pipe wall overlaps with the cutting edge of the upper section of the pipe wall, and the projection of the lower end of the cutting edge of the middle section of the pipe wall overlaps with the cutting edge of the lower section of the pipe wall. The above structure avoids seams and burrs, making the outer wall of the warm water pipe smoother.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The method for processing the integrated hot water pipe of a water pump using the above technical solution and the combined tool used therein are simple and efficient. The hot water pipe blank is first integrally formed on the water pump housing and then placed in a CNC machining center. The combined tool is rotated on the hot water pipe blank in a non-coaxial manner so that the fine structure of the hot water pipe can be formed at one time by rotating the combined tool in situ. There is no need to change position during the processing of the combined tool, which not only greatly improves the processing efficiency, but also greatly improves the processing accuracy. The product consistency is good and the work error is small, which solves the processing problem of the integrated hot water pipe and greatly improves the freedom of the position and structural design of the hot water pipe, while overcoming the problem of insufficient reliability of independent hot water pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flow chart of a method for processing a water pump integrated heating water pipe;

[0032] Figure 2 It is a structural schematic diagram of a combined tool;

[0033] Figure 3 is a schematic diagram of the installation positions of the four flange cutting edges;

[0034] Figure 4 It is a schematic diagram of the structure of the water pump housing;

[0035] Figure 5 It is a partial cross-sectional view of the water pump housing at the warm water pipe position. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with embodiments and drawings.

[0037] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a method for processing a water pump integrated heating water pipe is performed according to the following steps:

[0038] S1. A warm water pipe embryo is integrally formed on the water pump housing A, preferably by casting, but other common processes may also be used.

[0039] S2. Clamp the water pump housing A on the fixture of the machining center, and install the combined tool on the spindle of the machining center. Since the machining center has the characteristics of multiple degrees of freedom, when clamping the water pump housing A, it is not necessary to require the hot water pipe embryo to face a specific direction like a lathe. Therefore, the fixture of the machining center only needs to be able to reliably clamp the water pump housing A, which greatly simplifies the design of the fixture, improves the versatility of the fixture, and reduces the cost of the fixture.

[0040] S3, driving the cutter head 2 of the combined cutter to be sleeved on the warm water pipe embryo, so that the warm water pipe embryo is embedded in the cutter head 2, and the rotation axis of the cutter head 2 is parallel to the central axis of the warm water pipe embryo.

[0041] S4, driving the combined tool to rotate, processing the hot water pipe embryo into the hot water pipe A1, by rotating the combined tool on the hot water pipe embryo non-axially, the combined tool is rotated in situ to form the fine structure of the hot water pipe A1 at one time.

[0042] S5, driving the cutter head 2 of the combined tool to separate from the warm water pipe A1, and removing the water pump housing A from the fixture of the machining center.

[0043] It should be pointed out that the outer circumferential surface of the hot water pipe A1 is provided with a limiting boss A13 and a tensioning flange A11; the side wall of the limiting boss A13 close to the tensioning flange A11 is a planar structure, the outer circumferential surface of the tensioning flange A11 is an arc-shaped structure, the outer wall A12 of the hot water pipe between the limiting boss A13 and the tensioning flange A11 is a cylindrical structure, and the combined tool forms the outer wall A12 of the hot water pipe, the outer circumferential surface of the tensioning flange A11 and the side wall of the limiting boss A13 close to the tensioning flange A11 at one time by rotating in situ.

[0044] See also Figure 2-Figure 5A combined tool comprises a tool handle 1 and a tool head 2 integrally formed at the outer end of the tool handle 1, the tool head 2 being a cylindrical structure, and an end surface of the tool head 2 away from the tool handle 1 is recessed to form a processing cavity 2a having a cylindrical structure, a plurality of flange cutting edges 2b are circumferentially arranged at the bottom of the wall of the processing cavity 2a, a plurality of outer wall cutting edges 2c are circumferentially arranged at the middle of the wall of the processing cavity 2a, and a plurality of multifunctional cutting edges 2d are circumferentially arranged at the upper part of the wall of the processing cavity 2a.

[0045] Each multifunctional cutting edge 2d has a limiting boss end face cutting edge 2d1 protruding from the end face of the cutter head 2 at one end away from the bottom of the machining cavity 2a. The limiting boss end face cutting edge 2d1 is used to form a side wall of the limiting boss A13 close to the tensioning flange A11. Each multifunctional cutting edge 2d has a tube wall upper section cutting edge 2d2 along the side edge of the cutter head 2 protruding radially inward from the wall of the machining cavity 2a.

[0046] Each flange cutting edge 2b protrudes radially inward from the side edge of the processing cavity 2a, and has a tensioning flange cutting edge 2b1 and a tube wall lower section cutting edge 2b2. The tensioning flange cutting edge 2b1 is located at one end of the tube wall lower section cutting edge 2b2 close to the bottom of the processing cavity 2a. Specifically, there are four flange cutting edges 2b, which are distributed in a cross shape. The tensioning flange cutting edges 2b1 of any two opposite flange cutting edges 2b have the same structure, and the concave depth of two opposite tensioning flange cutting edges 2b1 is greater than the concave depth of the other two opposite tensioning flange cutting edges 2b1. Therefore, the two relatively arranged tensioning flange cutting edges 2b1 with larger recessed depth are rough machining cutting edges, and the two relatively arranged tensioning flange cutting edges 2b1 with smaller recessed depth are fine machining cutting edges. Through such a design, the rough machining cutting edge can share the cutting pressure of the fine machining cutting edge, which not only effectively protects the fine machining cutting edge, but also effectively improves the cutting efficiency. At the same time, even if the rough machining cutting edge is worn, as long as the fine machining cutting edge is intact, it will not affect the use of the combination tool, effectively extending the maintenance period and replacement frequency of the combination tool.

[0047] Furthermore, the flange cutting edge 2b protrudes radially inward from the side edge of the processing cavity 2a along the cutter head 2, and has an inwardly protruding positioning protrusion 2b3. The positioning protrusion 2b3 is located at the end of the tensioning flange cutting edge 2b1 away from the lower section cutting edge 2b2 of the pipe wall. The surface of the positioning protrusion 2b3 on one side close to the tensioning flange cutting edge 2b1 is inclined outward from the end of the tensioning flange cutting edge 2b1 toward the bottom of the processing cavity 2a. In this embodiment, the inclination angle of the surface of the positioning protrusion 2b3 on one side close to the tensioning flange cutting edge 2b1 is preferably 5°, which can not only achieve an avoidance effect, reduce friction, and improve cutting efficiency, but also can more reliably support and position the hot water pipe embryo, ensure processing stability, and reduce work error.

[0048] Each outer wall cutting edge 2c protrudes radially inward from the side edge of the processing cavity 2a and has a tube wall middle section cutting edge 2c1.

[0049] Each upper wall cutting edge 2d2, middle wall cutting edge 2c1 and lower wall cutting edge 2b2 are straight line structures with the same protruding height to jointly form the outer wall A12 of the warm water pipe. Each tensioning flange cutting edge 2b1 is an arc structure that is concave radially outward along the cutter head 2 and is used to form the outer peripheral surface of the tensioning flange A11.

[0050] There are two outer wall cutting edges 2c, which are arranged opposite to each other, and there are two multifunctional cutting edges 2d, which are arranged opposite to each other. The two outer wall cutting edges 2c and the two multifunctional cutting edges 2d are arranged in a cross distribution in space, which can effectively improve the processing efficiency while taking into account the processing difficulty and manufacturing cost of the combined tool. In addition, the projection of the upper end of the pipe wall middle section cutting edge 2c1 partially overlaps with the pipe wall upper section cutting edge 2d2, and the projection of the lower end of the pipe wall middle section cutting edge 2c1 partially overlaps with the pipe wall lower section cutting edge 2b2, so as to avoid seams and burrs and make the outer wall of the warm water pipe smoother.

[0051] Furthermore, there is a rounded corner between the tension flange edge 2b1 and the positioning protrusion 2b3, and the arc radius is preferably 0.5mm, and there is a rounded corner between the lower wall edge 2b2 and the tension flange edge 2b1, and the arc radius is preferably 2mm. The transition is smoother and easier to assemble.

[0052] Furthermore, a plurality of chip removal openings 2e are provided on the cavity wall of the machining cavity 2a and penetrate to the outer wall of the cutter head 2. Each flange cutting edge 2b, outer wall cutting edge 2c and multifunctional cutting edge 2d are respectively arranged on the inner side of the corresponding chip removal opening 2e, which can efficiently remove chips and improve machining efficiency.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A method for processing a water pump integrated heating water pipe, characterized in that: Follow these steps: S1. A warm water pipe embryo is integrally formed on the water pump housing (A); S2. Clamp the water pump housing (A) on the fixture of the machining center, and install the combined tool on the spindle of the machining center; S3, driving the cutter head (2) of the combined cutter to be sleeved on the hot water pipe embryo, so that the hot water pipe embryo is embedded in the cutter head (2), and the rotation axis of the cutter head (2) is parallel to the central axis of the hot water pipe embryo; S4, driving the combined cutter to rotate, and processing the hot water pipe embryo into the hot water pipe (A1); S5, driving the cutter head (2) of the combined tool to separate from the warm water pipe (A1), and removing the water pump housing (A) from the fixture of the machining center; The outer circumferential surface of the hot water pipe (A1) is provided with a limiting boss (A13) and a tensioning flange (A11); the side wall of the limiting boss (A13) close to the tensioning flange (A11) is in a planar structure; the outer circumferential surface of the tensioning flange (A11) is in an arc-shaped structure; the outer wall (A12) of the hot water pipe between the limiting boss (A13) and the tensioning flange (A11) is in a cylindrical structure; the combined tool forms the outer wall (A12) of the hot water pipe, the outer circumferential surface of the tensioning flange (A11) and the side wall of the limiting boss (A13) close to the tensioning flange (A11) at one time by rotating in situ.

2. The method for processing a water pump integrated heating water pipe according to claim 1, characterized in that: The combined tool comprises a tool handle (1) and a tool head (2) integrally formed at the outer end of the tool handle (1); an end surface of the tool head (2) away from the tool handle (1) is recessed to form a processing cavity (2a) in a cylindrical structure; a plurality of flange cutting edges (2b) are circumferentially arranged at the bottom of the cavity wall of the processing cavity (2a); a plurality of outer wall cutting edges (2c) are circumferentially arranged at the middle of the cavity wall of the processing cavity (2a); and a plurality of multifunctional cutting edges (2d) are circumferentially arranged at the upper part of the cavity wall of the processing cavity (2a); Each multifunctional cutting edge (2d) has an end face cutting edge (2d1) of a limiting boss protruding from the end face of the cutter head (2) at one end away from the bottom of the processing cavity (2a); the limiting boss end face cutting edge (2d1) is used to form a side wall of the limiting boss (A13) close to the tensioning flange (A11); and each multifunctional cutting edge (2d) has an upper section cutting edge (2d2) of the tube wall along the side edge of the cutter head (2) protruding radially inward from the wall of the processing cavity (2a); Each flange cutting edge (2b) protrudes radially inward from the side edge of the machining cavity (2a) of the cutter head (2) and comprises a tensioning flange cutting edge (2b1) and a tube wall lower section cutting edge (2b2), wherein the tensioning flange cutting edge (2b1) is located at one end of the tube wall lower section cutting edge (2b2) ​​close to the bottom of the machining cavity (2a); Each outer wall cutting edge (2c) protrudes radially inward from the side edge of the processing cavity (2a) and has a tube wall middle section cutting edge (2c1); Each of the upper pipe wall cutting edges (2d2), the middle pipe wall cutting edges (2c1) and the lower pipe wall cutting edges (2b2) ​​are all straight line structures and have the same protruding heights so as to jointly form the outer wall (A12) of the warm water pipe. Each of the tensioning flange cutting edges (2b1) is an arc structure that is concave radially outward along the cutter head (2) and is used to form the outer peripheral surface of the tensioning flange (A11).

3. The method for processing a water pump integrated heating water pipe according to claim 2, characterized in that: There are four flange cutting edges (2b) in total, and the four flange cutting edges (2b) are distributed in a cross shape. The tensioning flange cutting edges (2b1) of any two opposite flange cutting edges (2b) have the same structure, and the recessed depth of two opposite tensioning flange cutting edges (2b1) is greater than the recessed depth of the other two opposite tensioning flange cutting edges (2b1).

4. The method for processing a water pump integrated heating water pipe according to claim 2, characterized in that: The flange cutting edge (2b) protrudes radially inward from the side edge of the machining cavity (2a) along the cutter head (2) and has an inwardly protruding positioning protrusion (2b3), the positioning protrusion (2b3) is located at one end of the tensioning flange cutting edge (2b1) away from the cutting edge (2b2) ​​of the lower section of the tube wall, and the side surface of the positioning protrusion (2b3) close to the tensioning flange cutting edge (2b1) is inclined outward from the end of the tensioning flange cutting edge (2b1) toward the bottom of the machining cavity (2a).

5. The method for processing a water pump integrated heating water pipe according to claim 4, characterized in that: The inclination angle of the surface of the positioning protrusion (2b3) close to the tensioning flange edge (2b1) is 5°.

6. The method for processing a water pump integrated heating water pipe according to claim 4, characterized in that: There is a rounded corner between the tensioning flange cutting edge (2b1) and the positioning protrusion (2b3), and there is a rounded corner between the cutting edge (2b2) ​​of the lower section of the tube wall and the tensioning flange cutting edge (2b1).

7. The method for processing a water pump integrated heating water pipe according to claim 2, characterized in that: There are two outer wall cutting edges (2c) in total, and the two outer wall cutting edges (2c) are arranged opposite to each other. There are two multifunctional cutting edges (2d) in total, and the two multifunctional cutting edges (2d) are arranged opposite to each other. The two outer wall cutting edges (2c) and the two multifunctional cutting edges (2d) are spatially distributed in a cross shape.

8. The method for processing a water pump integrated heating water pipe according to claim 2, characterized in that: The wall of the machining cavity (2a) is provided with a plurality of chip removal openings (2e) penetrating to the outer wall of the cutter head (2), and each flange cutting edge (2b), outer wall cutting edge (2c) and multifunctional cutting edge (2d) are respectively arranged on the inner side of the corresponding chip removal opening (2e).

9. The method for processing a water pump integrated heating water pipe according to claim 2, characterized in that: The projection of the upper end of the tube wall middle section cutting edge (2c1) partially overlaps with the tube wall upper section cutting edge (2d2), and the projection of the lower end of the tube wall middle section cutting edge (2c1) partially overlaps with the tube wall lower section cutting edge (2b2).

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