Forming cutter

Abstract

A forming cutter is suitable for machining and forming an outer conical surface of a hydraulic cone valve and / or an inner conical surface corresponding to the outer conical surface, extends along an axis and is provided with a machining blade. The machining edge comprises a cutting edge and an extrusion finishing section connected to the cutting edge; the extrusion finishing section is provided with an extrusion surface; and the extrusion surface is formed by rotating an initial line around the axis. According to the forming cutter, two machining modes are achieved through a single tool, and the machining process is effectively simplified; cutting provides shape and most size precision, and extrusion is used for improving surface quality and detail precision; and moreover, the workpiece is not detached in the cutting and extrusion finishing process, so that the machining precision and the surface quality are ensured, and the roundness and the surface smoothness of the conical surface can be improved through a continuous machining process.

Description

Technical Field

[0001] The utility model relates to a cutting tool, in particular to a forming tool suitable for machining the conical surface of a hydraulic cone valve. Background Art

[0002] Hydraulic poppet valves play a vital role in hydraulic systems. Their sealing performance directly impacts system pressure maintenance, fluid control accuracy, efficiency, and long-term operational stability. The quality of the cone surface machining in poppet valves directly determines their sealing efficiency and is a key factor in ensuring their sealing performance. High-precision machining is required to ensure good sealing contact and minimize leakage.

[0003] In the existing cone surface processing method of hydraulic cone valves, a forming cutter is generally used for mechanical cutting. This method is prone to generate uneven cutting force during the processing, resulting in local thermal stress concentration and elastic deformation of the material, which in turn affects the final cone surface quality and often makes it difficult to achieve the required high-precision standards.

[0004] Modern high-performance hydraulic systems place increasingly stringent performance demands on cone valves, including, but not limited to, maintaining excellent sealing performance under high pressure, high flow rates, and constantly changing environmental conditions. Faced with these performance requirements, traditional cone valve machining processes face the challenge of significantly improving the machining quality of the cone surface while maintaining high production efficiency and meeting the stringent standards for high sealing performance. Utility Model Content

[0005] The utility model provides a forming knife which can ensure high production efficiency and significantly improve the processing quality of the conical surface.

[0006] The forming knife of the utility model is suitable for processing the outer cone surface of a hydraulic cone valve and / or the inner cone surface corresponding to the outer cone surface, and extends along an axis. The forming knife has a processing edge; the processing edge includes a cutting edge and an extrusion finishing section connected to the cutting edge; the extrusion finishing section has an extrusion surface; the extrusion surface is formed by rotating an initial line around the axis.

[0007] Preferably, the initial line is an oblique straight line, and the two contour lines obtained by extruding the entire segment on its axial cross section include an angle of 90 degrees.

[0008] Preferably, the cutting edge has a front end face and a cutting side face connected to the front end face, and the cutting side face extends along the axis.

[0009] Preferably, the front end surface has a groove located in the center and concavely arranged along the axis, a plane portion extending from the top edge of the groove in a radial direction perpendicular to the axis, and a slope portion extending obliquely from the plane portion.

[0010] Preferably, the cutting side surface includes a first cutting side surface and a second cutting side surface, the extrusion polishing section includes a first extrusion polishing section and a second extrusion polishing section, the first cutting side surface connects the front end face and the first extrusion polishing section, and the second cutting side surface connects the second extrusion polishing section and the side of the first extrusion polishing section away from the first cutting side surface.

[0011] Preferably, the initial line is an arc.

[0012] Preferably, the forming knife further comprises a knife handle connected to the processing edge.

[0013] Preferably, the cutting edge, the extruded polishing section and the handle are integrally formed.

[0014] The beneficial technical effect of the present invention is that the forming knife of the present invention realizes two processing modes through a single tool, which effectively simplifies the processing flow. Cutting provides shape and most dimensional accuracy, while extrusion is used to improve surface quality and detail accuracy. After cutting is completed, the conical surface is carefully extruded and polished. Extrusion polishing can utilize the principle of plastic deformation to improve surface quality, eliminate micro-unevenness and residual stress generated during the cutting process, thereby improving the roundness and surface finish of the conical surface. Moreover, the workpiece is not removed during the cutting and extrusion finishing process, ensuring processing accuracy and surface quality, and the roundness and surface finish of the conical surface can be improved through a continuous processing flow. The extrusion finishing process is utilized to improve the microstructure of the conical surface, and the small defects and irregularities generated during the cutting process are filled by the plastic deformation mechanism, thereby improving the sealing performance of the conical surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view illustrating the forming knife of the present invention.

[0016] Figure 2 This is a partial enlarged picture, auxiliary explanation Figure 1 The structure of the middle A part. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention will be described below with reference to the accompanying drawings.

[0018] See Figure 1 、 2 The forming knife 1 of the present invention is suitable for processing the outer cone surface of a hydraulic cone valve and / or the inner cone surface corresponding to the outer cone surface, that is, the forming knife 1 is used to process the valve blank of the hydraulic cone valve to form the outer cone surface on the valve blank, and the forming knife 1 can also be used to form the inner cone surface.

[0019] The shaping knife 1 extends along the axis X and has a processing edge and a knife handle 13 connected to the processing edge. The processing edge includes a cutting edge 11 and an extrusion polishing section 12 connected to the cutting edge 11.

[0020] The cutting edge 11 has a front end face and a cutting side face connected to the front end face. The front end face comprises a groove located in the center and concavely disposed along the axis X toward the tool shank 13; a flat surface extending radially perpendicular to the axis X from the top edge of the groove; and a chamfered surface extending obliquely from the flat surface. The cutting side face extends along the axis X, enabling the cutting edge 11 to cut a desired conical valve hole.

[0021] The extruded polishing section 12 is connected to the cutting side of the cutting edge 11, adjacent to the shank 13, and has an extrusion surface. The extrusion surface is formed by rotating an initial line about the axis X. The initial line can be an arc or a straight line. In this embodiment, the initial line is an oblique straight line, and the two contour lines of the extruded polishing section 12, obtained on its axial cross-section, form a 90-degree angle.

[0022] In some embodiments, the outer conical surface may have two frustum surfaces. For the convenience of explanation, the two frustum surfaces are divided into a first frustum surface and a second frustum surface, and the radius of the bottom surface of the first frustum surface adjacent to the second frustum surface is the maximum bottom radius, the radius of the bottom surface of the second frustum surface adjacent to the first frustum surface is the minimum bottom radius, and the maximum bottom radius of the first frustum surface is smaller than the minimum bottom radius of the second frustum surface. Correspondingly, the number of the cutting side surfaces of the cutting edge 11 and the extrusion polishing section 12 is also two, which are respectively divided into a first cutting side surface and a second cutting side surface; and a first extrusion polishing section and a second extrusion polishing section. The first cutting side surface connects the front end face and the first extrusion polishing section, and is processed with the first extrusion polishing section to form a corresponding first frustum surface. The second cutting side surface connects the second extrusion polishing section and the side of the first extrusion polishing section away from the first cutting side surface, and is processed with the second extrusion polishing section to form a corresponding second frustum surface.

[0023] It is understandable that the outer conical surface may also have more than two frustum surfaces, and correspondingly, the number of the cutting side surfaces and the extrusion polishing sections 12 may also be increased accordingly.

[0024] The handle 13 is used to mount the forming knife 1 on a machine tool. Its shape and material can be adjusted according to actual needs. It is not the focus of this utility model and will not be described in detail here. The cutting edge 11, the extruded polishing section 12 and the handle 13 can be made in one piece or can be made separately and then fixed together.

[0025] The forming knife of the present invention can take advantage of the advantages of both cutting and extrusion processes, realize two processing modes through a single tool, and effectively simplify the processing flow. Cutting provides shape and most dimensional accuracy, while extrusion is used to improve surface quality and detail accuracy. After cutting is completed, the conical surface is carefully extruded and polished. Extrusion polishing can utilize the principle of plastic deformation to improve surface quality, eliminate micro-irregularities and residual stress generated during the cutting process, thereby improving the roundness and surface finish of the conical surface. Moreover, the workpiece is not removed during the cutting and extrusion finishing process, ensuring processing accuracy and surface quality, and the roundness and surface finish of the conical surface can be improved through a continuous processing flow. Extrusion polishing is used to improve the microstructure of the conical surface, and the small defects and irregularities generated during the cutting process are filled through the plastic deformation mechanism, thereby improving the sealing performance of the conical surface.

Claims

1. A forming knife, suitable for machining an outer cone surface of a hydraulic cone valve and / or an inner cone surface corresponding to the outer cone surface, and extending along an axis, characterized in that: The forming knife has a processing edge; the processing edge includes a cutting edge and an extrusion finishing section connected to the cutting edge; the extrusion finishing section has an extrusion surface; the extrusion surface is formed by rotating an initial line around the axis.

2. The forming knife according to claim 1, characterized in that: The initial line is an oblique straight line, and the two contour lines obtained on the axial cross section of the extruded light segment include an angle of 90 degrees.

3. The forming knife according to claim 1, characterized in that: The cutting edge has a front end surface and a cutting side surface connected to the front end surface, and the cutting side surface extends along the axis.

4. The forming knife according to claim 3, characterized in that: The front end surface comprises a groove located in the center and concavely arranged along the axis, a plane portion extending from the top edge of the groove in a radial direction perpendicular to the axis, and an inclined portion extending obliquely from the plane portion.

5. The forming knife according to claim 3, characterized in that: The cutting side surface includes a first cutting side surface and a second cutting side surface, and the extrusion polishing section includes a first extrusion polishing section and a second extrusion polishing section. The first cutting side surface connects the front end face and the first extrusion polishing section, and the second cutting side surface connects the second extrusion polishing section and the side of the first extrusion polishing section away from the first cutting side surface.

6. The forming knife according to claim 1, characterized in that: The initial line is an arc.

7. The forming knife according to claim 1, characterized in that: The forming knife further comprises a knife handle connected to the processing edge.

8. The forming knife according to claim 7, characterized in that: The cutting edge, the extruded polishing section and the tool handle are integrally formed.

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