An oil nozzle needle valve body contour grinding positioning tool

Abstract

This utility model relates to a grinding and positioning fixture for the outer shape of an oil nozzle needle valve body. The fixture includes a headstock tip and a tailstock tip. The conical structure of the tail section of the oil nozzle needle valve body is aligned and placed into the mounting hole at the left end of the tailstock tip. The needle valve body is directly engaged with the opening of the head section of the needle valve body through the headstock tip for transmission and rotation. Sufficient operating space is left between the surface of the oil nozzle needle valve body and the fixture. The grinding wheel can simultaneously approach and grind the outer diameter of the head section, the outer diameter of the middle section, and the outer diameter of the tail section without interference, realizing the simultaneous completion of grinding of multiple parts, improving production efficiency. Furthermore, this fixture structure is universal for needle valve body parts with different specifications of surface positioning holes, reducing changeover time and tooling costs, and fundamentally eliminating the problem of mandrel breakage caused by over-positioning of the surface positioning hole and the mandrel, thus improving the stability and reliability of the processing.

Description

Technical Field

[0001] This utility model relates to the field of tooling structure technology, and in particular to a tooling for grinding and positioning the outer shape of an oil nozzle needle valve body. Background Technology

[0002] In the traditional external cylindrical grinding of the needle valve body, the tooling that uses the positioning hole on the surface of the needle valve body for positioning and transmission is commonly used. The reliance on the end face positioning hole greatly limits the space between the tooling and the surface of the part, making it impossible to grind the large and small outer diameters of the needle valve body at the same time in one clamping. The large and small outer diameters must be processed in sequence, resulting in low production efficiency.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a grinding and positioning fixture for the outer shape of an oil nozzle needle valve body, which solves the problem that the grinding of the large and small outer diameters of the needle valve body cannot be completed simultaneously in one clamping, and that the large and small outer diameters must be processed in sequence, resulting in low production efficiency.

[0005] The technical solution adopted in this utility model is as follows: A grinding and positioning fixture for an oil nozzle needle valve body is provided. The oil nozzle needle valve body, after machining, comprises a head section, a middle section, and a tail section, all cylindrical and connected in sequence. The head section has an axially formed opening, and the tail section has a tapered structure at its right end. The grinding and positioning fixture for the oil nozzle needle valve body includes: The headstock tip includes a drive section and a plug section. The plug section is coaxially connected to the right end of the drive section, and the right end of the plug section extends into the orifice and is engaged in the orifice. The tailstock tip includes a fixed section and an erection section. The erection section is coaxially connected to the left end of the fixed section. An erection hole is coaxially opened at the left end of the erection section. The cone extends into the erection hole and the outer surface of the cone structure abuts against the erection hole. The drive section rotates circumferentially, and the tip of the headstock drives the nozzle needle valve body to rotate.

[0006] A further technical solution is that the mounting hole is a conical hole, with the end of the mounting hole with a larger inner diameter facing the nozzle needle valve body, and a chamfered transition section is provided between the right end of the tail section and the conical structure, with the surface of the transition section fitting against the inner wall of the conical hole.

[0007] A further technical solution is that the cone angle of the tapered hole is 60°, and the transition section has a 60° chamfer.

[0008] A further technical solution is that the plug-in segment includes a connecting segment and a contact segment. The connecting segment is cylindrical, and the left end of the connecting segment is connected to the right end of the driving segment. The contact segment is conical, and the end with the larger outer diameter of the contact segment is connected to the right end of the connecting segment. The end with the smaller outer diameter of the contact segment extends into the orifice.

[0009] A further technical solution is that the cone angle of the contact segment is 16°.

[0010] A further technical solution is that the material of the plug segment is a solid cemented carbide.

[0011] A further technical solution is that the inner wall of the mounting hole is coated with a wear-resistant coating.

[0012] A further technical solution is that the oil nozzle needle valve body outer surface grinding and positioning fixture also includes a worktable, the headstock tip and the tailstock tip are located on both sides of the worktable, the left side of the drive section of the headstock tip is connected to the output end of the drive device on the worktable, and the drive device drives the headstock tip to rotate circumferentially.

[0013] The beneficial effects of this utility model embodiment are as follows: (i) A grinding and positioning fixture for the outer shape of a needle valve body is used for a needle valve body. The grinding and positioning fixture for the outer shape of a needle valve body includes a headstock tip and a tailstock tip. The conical structure of the tail section of the needle valve body is aligned and placed into the mounting hole at the left end of the tailstock tip. The needle valve body is directly engaged with the hole of the head section of the needle valve body through the headstock tip for transmission and rotation. Sufficient operating space is left between the surface of the needle valve body and the fixture. The grinding wheel can simultaneously approach and grind the outer circle of the head section, the outer circle of the middle section and the outer circle of the tail section without interference, realizing the simultaneous completion of grinding of multiple parts, improving production efficiency. Moreover, the fixture structure is universal for needle valve body parts with different specifications of surface positioning holes, reducing changeover time and tooling costs, and fundamentally eliminating the problem of mandrel breakage caused by over-positioning of surface positioning holes and mandrel, improving the stability and reliability of the processing process.

[0014] (ii) Furthermore, the material of the insertion section is integral cemented carbide. Utilizing the extremely high hardness, wear resistance, and rigidity of cemented carbide, the contact section can maintain its accuracy even after long-term exposure to workpiece rotational friction and grinding vibration, thereby improving the stability and service life of the tooling and enabling continuous high-precision machining of more needle valve bodies.

[0015] (iii) Furthermore, the inner wall of the mounting hole is coated with a wear-resistant coating. This wear-resistant coating reduces the coefficient of sliding friction between the mounting hole and the transition section surface. While providing the necessary axial clamping force, it reduces the frictional resistance and contact surface wear during relative rotation, preventing scratches on the high-precision positioning surface of the part during processing, protecting the workpiece, extending the service life of the tailstock tip itself, and ensuring the long-term stable positioning accuracy of the tooling. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the longitudinal section of the oil nozzle needle valve body in the grinding and positioning fixture for the outer shape of the oil nozzle needle valve body according to the present invention.

[0017] Figure 2 This is a longitudinal section diagram of the headstock tip in a grinding and positioning fixture for the outer shape of an oil nozzle needle valve body according to this utility model.

[0018] Figure 3 This is a longitudinal section diagram of the tailstock tip in a grinding and positioning fixture for the outer shape of an oil nozzle needle valve body according to this utility model.

[0019] Figure 4 This is a longitudinal section diagram of the oil nozzle needle valve body after the grinding and positioning fixture of this utility model has been installed.

[0020] In the picture: 100. Needle valve body; 110. Head section; 111. Orifice; 120. Middle section; 130. Tail section; 131. Conical structure; 132. Transition section; 200. Headstock tip; 210. Drive section; 220. Insertion section; 221. Connection section; 222. Contact section; 300. Tailstock tip; 310. Fixing section; 320. Erection section; 321. Erection hole. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] First embodiment: like Figure 1 As shown, a grinding and positioning fixture for the outer shape of an oil nozzle needle valve body is used for an oil nozzle needle valve body 100. After machining, the oil nozzle needle valve body 100 includes a head section 110, a middle section 120, and a tail section 130, all of which are cylindrical and connected in sequence. The head section 110 has an axially opened orifice 111, and the tail section 130 has a tapered structure 131 at its right end. The grinding and positioning fixture for the outer shape of the oil nozzle needle valve body includes: like Figure 2 and Figure 4As shown, the headstock tip 200 includes a drive section 210 and a plug-in section 220. The plug-in section 220 is coaxially connected to the right end of the drive section 210, and the right end of the plug-in section 220 extends into the orifice 111 and is engaged within the orifice 111. For example, the plug-in section 220 includes a connecting section 221 and a contact section 222. The connecting section 221 is cylindrical, and its left end is connected to the right end of the drive section 210. The contact section 222 is conical, with the larger outer diameter end of the contact section 222 connected to the right end of the connecting section 221, and the smaller outer diameter end of the contact section 222 extending into the orifice 111.

[0023] like Figure 3 and Figure 4 As shown, the tailstock tip 300 includes a fixed section 310 and a mounting section 320. The mounting section 320 is coaxially connected to the left end of the fixed section 310. A mounting hole 321 is coaxially formed at the left end of the mounting section 320. The cone extends into the mounting hole 321, and the outer surface of the cone-shaped structure 131 abuts against the inside of the mounting hole 321. For example, the mounting hole 321 is a cone-shaped hole. The end of the mounting hole 321 with a larger inner diameter faces the nozzle needle valve body 100. A chamfered transition section 132 is also provided between the right end of the tailstock 130 and the cone-shaped structure 131. The surface of the transition section 132 is in contact with the inner wall of the cone-shaped hole.

[0024] The circumferential rotation drive section 210, with the headstock tip 200 driving the nozzle needle valve body 100 to rotate. For example, the nozzle needle valve body contour grinding and positioning fixture also includes a worktable, with the headstock tip 200 and tailstock tip 300 located on either side of the worktable. The left side of the drive section 210 of the headstock tip 200 is connected to the output end of the drive device on the worktable, and the drive device drives the headstock tip 200 to rotate circumferentially.

[0025] like Figure 3 As shown, the tapered hole has a taper angle of 60°, and the transition section 132 has a 60° chamfer. The fit between the 60° tapered hole and the 60° chamfered transition section 132 at the tail of the nozzle needle valve body 100 achieves axial positioning and automatic centering. The large taper angle surface contact provides stable support for the transition section 132 and the mounting hole 321, dispersing the radial force during grinding. At the same time, it avoids stress concentration and surface damage of the parts caused by small-angle contact, ensuring the coaxiality and machining accuracy of the workpiece rotation.

[0026] like Figure 2As shown, the cone angle of contact section 222 is 16°. This 16° cone angle of contact section 222 achieves a balance between transmission efficiency and axial clamping force. Compared to a smaller angle, it provides sufficient circumferential friction transmission force while significantly reducing the required axial clamping force, avoiding over-positioning and workpiece deformation. Compared to a larger angle, its wedge effect can generate a larger friction torque, effectively preventing transmission slippage caused by insufficient torque during grinding, thereby ensuring the stability and accuracy of the machining process.

[0027] Furthermore, the material of the insertion section 220 is a solid cemented carbide, such as tungsten-cobalt, tungsten-titanium-cobalt, or carbide alloys. Utilizing the extremely high hardness, wear resistance, and rigidity of cemented carbide, the contact section 222 can maintain its accuracy even after long-term exposure to workpiece rotational friction and grinding vibration, thereby improving the stability and service life of the tooling and enabling continuous high-precision machining of more needle valve bodies.

[0028] Furthermore, the inner wall of the mounting hole 321 is coated with a wear-resistant coating, such as titanium nitride, titanium carbonitride, or titanium aluminum nitride. This wear-resistant coating reduces the coefficient of sliding friction between the mounting hole 321 and the transition section 132 surface. While providing the necessary axial clamping force, it reduces frictional resistance and contact surface wear during relative rotation, preventing scratches on the high-precision positioning surface of the part during processing. This protects the workpiece, extends the service life of the tailstock center 300, and ensures long-term stable positioning accuracy of the tooling.

[0029] In operation, this embodiment is as follows: The operator aligns the orifice 111 of the head section 110 of the needle valve body 100 with the insertion section 220 on the right end of the headstock tip 200, so that the conical contact section 222 of the insertion section 220 extends into the orifice 111 and fits tightly with its 16° cone angle. At the same time, the operator aligns the 60° conical structure 131 on the right end of the tail section 130 of the needle valve body with the headstock tip 300 and places it into the 60° conical mounting hole 321 on the left end of the tailstock tip 300. Then, the operator starts the drive device of the machine tool, which drives the drive section 210 of the headstock tip 200 to rotate circumferentially. The friction between the insertion section 220 and the chamfered wall of the orifice 111 drives the entire needle valve body 100 to rotate synchronously. At this time, the mounting hole 321 of the tailstock tip 300 plays a supporting and axial positioning role. After the workpiece rotates stably, the feed of the grinding wheel is controlled, and the outer circular surfaces of the head section 110, middle section 120 and tail section 130 of the needle valve body can be ground synchronously in one clamping. The insertion section 220 and the mounting hole 321, which are made of integral cemented carbide and coated with wear-resistant coating, effectively ensure the reliability of transmission and reduce wear until the machining is completed.

[0030] In this embodiment, sufficient operating space is left between the surface of the nozzle needle valve body 100 and the tooling. The grinding wheel can simultaneously approach and grind the outer diameter of the head section 110, the outer diameter of the middle section 120, and the outer diameter of the tail section 130 without interference, realizing the synchronous completion of grinding of multiple parts, improving production efficiency. Furthermore, this tooling structure is universal for nozzle needle valve body 100 parts with different surface positioning holes, reducing changeover time and tooling costs. It also fundamentally eliminates the problem of mandrel breakage caused by over-positioning of the surface positioning hole and the mandrel, improving the stability and reliability of the processing.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A grinding and positioning fixture for the outer shape of an oil nozzle needle valve body, characterized in that, For use in oil nozzle needle valve bodies, the oil nozzle needle valve body, after machining, comprises a head section, a middle section, and a tail section, all of which are cylindrical and connected in sequence. The head section has an axially opened orifice, and the right end of the tail section has a tapered structure. The grinding and positioning fixture for the outer shape of the oil nozzle needle valve body includes: The headstock tip includes a drive section and a plug section. The plug section is coaxially connected to the right end of the drive section, and the right end of the plug section extends into the orifice and is engaged in the orifice. The tail section includes a fixed section and an erection section. The erection section is coaxially connected to the left end of the fixed section. An erection hole is coaxially opened at the left end of the erection section. The conical structure extends into the erection hole, and the outer surface of the right end of the tail section abuts against the erection hole. The drive section rotates circumferentially, and the tip of the headstock drives the nozzle needle valve body to rotate.

2. The oil nozzle needle valve body outer surface grinding and positioning fixture according to claim 1, characterized in that: The mounting hole is a tapered hole, with the end of the mounting hole with a larger inner diameter facing the nozzle needle valve body. A chamfered transition section is also provided between the right end of the tail section and the tapered structure, and the surface of the transition section is in contact with the inner wall of the tapered hole.

3. The oil nozzle needle valve body outer surface grinding and positioning fixture according to claim 2, characterized in that: The cone angle of the tapered hole is 60°, and the transition section has a 60° chamfer.

4. The oil nozzle needle valve body outer surface grinding and positioning fixture according to claim 1, characterized in that: The plug-in section includes a connecting section and a contact section. The connecting section is cylindrical, and its left end is connected to the right end of the driving section. The contact section is conical, with the larger outer diameter end of the contact section connected to the right end of the connecting section, and the smaller outer diameter end of the contact section extending into the orifice.

5. The oil nozzle needle valve body outer surface grinding and positioning fixture according to claim 4, characterized in that: The cone angle of the contact section is 16°.

6. The oil nozzle needle valve body outer surface grinding and positioning fixture according to claim 1, characterized in that: The material of the plug segment is solid cemented carbide.

7. The oil nozzle needle valve body outer surface grinding and positioning fixture according to claim 1, characterized in that: The inner wall of the mounting hole is coated with a wear-resistant coating.

8. The oil nozzle needle valve body outer profile grinding and positioning fixture according to claim 1, characterized in that: The oil nozzle needle valve body outer surface grinding and positioning fixture also includes a worktable. The headstock tip and the tailstock tip are located on both sides of the worktable. The left side of the drive section of the headstock tip is connected to the output end of the drive device on the worktable. The drive device drives the headstock tip to rotate circumferentially.

Images