High precision pcd tool for machining valve plates

Abstract

The utility model discloses a high accuracy PCD cutter of processing valve plate, including cutter body, the circumference of cutter body is provided with a plurality of PCD inserts, the length of PCD insert is four times of valve plate oil groove width, so that PCD insert can always be in contact with the support action of valve plate reinforcing rib. After adopting this scheme, the cutter is not limited by the number of grinding, and the valve plate processing of oil groove width >=5MM is obviously improved, the number of tool changing and grinding is reduced, and there is great economic value.

Description

Technical Field

[0001] This utility model relates to PCD cutting tools, specifically a high-precision PCD cutting tool for machining valve plates. Background Technology

[0002] In the automotive parts manufacturing industry, PCD diamond tools are widely used in the machining of valve plates—a core component of the hydraulic control module in automotive transmissions. The valve plate is made of cast aluminum, with a bore diameter requirement of 0.01-0.015mm and a cylindricity of 0.008mm. Machining is significantly affected by workshop temperature, but building a temperature-controlled workshop is a substantial expense that small and medium-sized enterprises cannot afford. In winter, when workshop temperatures are low, the bore diameter machined by the tool becomes larger, requiring the cutting edge and support edge to be ground smaller. In summer, when workshop temperatures are high, the bore diameter machined by the tool becomes smaller, necessitating the replacement of the PCD tool. However, the height difference between the support edge and the cutting edge must be ≤0.005mm; otherwise, cylindricity deviations and bore diameter instability will occur. Due to the high requirements for bore diameter and roundness, ordinary PCD reamers will be scrapped after multiple re-grindings because they cannot guarantee accuracy. The oil groove spacing in a standard valve plate is around 3mm, but in some valve plates with an oil groove spacing ≥5mm, machining will result in bore diameter and cylindricity deviations.

[0003] The disadvantages are as follows:

[0004] (1) In non-constant temperature workshops, the temperature of the machine tool cutting fluid will be affected by the external weather temperature. According to experimental records, if the cutting fluid temperature differs by 10°, the diameter of the machined hole produced by the same tool under the same conditions will change by more than 0.005 mm. The tolerance of the valve core hole is generally between 0.010 and 0.015 mm. At this time, the PCD tool needs to be replaced and re-grinded according to the temperature change. The diameter of the PCD tool can be increased according to the actual situation. The support edge of the base part is fixed and cannot be increased in diameter. If the difference between the PCD cutting edge and the base support edge is greater than 0.005 mm, the support edge will not be able to play a supporting role. Continued use will cause machining abnormalities and eventually lead to the scrapping of the PCD tool.

[0005] (2) Increase the number of regrinding cycles for PCD tools to reduce tool costs;

[0006] (3) Solve the problem of unstable hole diameter and cylindricity when machining valve core holes with a groove spacing of more than 5mm. Utility Model Content

[0007] To address the shortcomings of the existing technology, this utility model provides a high-precision PCD tool for machining valve plates. With this solution, the tool is not limited by the number of regrinding operations, and there is a significant improvement in machining valve plates with an oil groove width of ≥5MM. This reduces the number of tool changes and regrinding operations, and has great economic value.

[0008] To achieve the above technical objectives, the present invention adopts the following technical solution: a high-precision PCD tool for machining valve plates, comprising a tool body, wherein a plurality of PCD blades are arranged around the circumference of the tool body, and the length of the PCD blades is four times the width of the oil groove of the valve plate, so that the PCD blades can always be in contact with the reinforcing ribs of the valve plate to provide support.

[0009] The length of the PCD insert is L5 = 15-25mm.

[0010] The radial distance between the cutter body and the PCD cutting tool is L9 = 0.015-0.025 mm.

[0011] The blade body has four or six PCD blades arranged around its circumference, and the PCD blades are evenly distributed around its circumference.

[0012] The blade body is provided with a mounting groove, and the PCD blade is welded into the mounting groove.

[0013] In summary, this utility model achieves the following technical effects:

[0014] Conventional cutting tools consist of 2 PCD cutting edges plus multiple support edges (guide bars). The PCD insert length is twice the width of the oil groove. The PCD insert only provides cutting functionality, with the support edge providing all the support. This invention uses 4 PCD cutting edges without support edges. The PCD insert length is four times the width of the oil groove. The PCD insert provides both cutting and support functions, thus avoiding tool failure due to insufficient precision after re-sharpening caused by temperature changes. The re-sharpening length is also shorter than that of conventional tools. The increased PCD insert length, due to its better support effect, makes the machining of hole diameter and roundness more stable, resulting in greater economic value.

[0015] This utility model uses four or more PCD cutting tools. The length of the PCD cutting tools is increased according to the distance between the reinforcing ribs and the oil grooves of the parts. The length of the PCD cutting tool is four times the distance between the oil grooves, generally between 15 and 25 mm, to ensure that the PCD cutting tools will not be affected by the grinding and thus cannot be supported. Attached Figure Description

[0016] Figure 1 It is a high-precision PCD tool for machining valve plates;

[0017] Figure 2 This is a diagram showing the tool's usage status. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] Example:

[0025] Figure 1 It is a high-precision PCD tool for machining valve plates. Figure 2 This is a schematic diagram of the tool in use, including the tool body 1. Multiple PCD blades 2 are arranged around the circumference of the tool body 1. The length of the PCD blades 2 is four times the width of the valve plate oil groove 3, so that the PCD blades 2 can always contact the valve plate reinforcing ribs 4 to provide support.

[0026] This invention sets the length of the PCD insert to four times the width of the oil groove, ensuring that the PCD insert always contacts the reinforcing ribs for support. It eliminates the guide bar used in traditional cutting tools for support. The PCD insert of this invention serves both cutting and support functions. When the tip of the PCD insert is in the oil groove, the rear section also contacts two reinforcing ribs. Figure 2 The state shown provides strong support, prevents axial wobble, provides precision, eliminates the need for guide bar processing, and is more economical.

[0027] The length L5 of PCD blade 2 is 15-25mm. This ensures a sufficient length to provide support.

[0028] The radial distance between the cutter body 1 and the PCD blade 2 is L9 = 0.015-0.025mm. This distance prevents the cutter body from interfering with the grinding process, while the smaller distance provides greater rigidity.

[0029] The blade body 1 has four or six PCD blades 2 arranged around its circumference, and the PCD blades 2 are evenly distributed around the circumference. In this embodiment, there are four PCD blades, evenly distributed around the circumference.

[0030] The cutter body 1 is provided with a mounting groove, and the PCD blade 2 is welded into the mounting groove. When the PCD blade wears out, the PCD blade is melted down and a new blade is installed, allowing the cutter body to be reused. Since the guide bar is eliminated, the step of installing the guide bar is also eliminated.

[0031] Furthermore, when machining stepped elongated holes, multiple sets of PCD inserts are installed on a single tool body. Each set of inserts is evenly distributed along the circumference, and the diameter of each set of inserts gradually decreases to accommodate the stepped holes. The length of all inserts is four times the width of the valve plate oil groove 3, serving as a support instead of a guide bar.

[0032] The cutting edge of this utility model tool is composed of four or more PCD blades. The radial distance between the tool body and the cutting edge is 0.015-0.025mm. The length of the PCD blade is four times the distance between the oil grooves. The PCD blade serves as both the cutting edge and the support edge. In this way, if the hole diameter is too small during machining, the PCD blade can be replaced directly without replacing the tool body. With the increased length of the PCD blade, when the initial section of the blade is in the oil groove, at least two sections of the rear section are supported by reinforcing ribs, making the tool machining more stable and less prone to vibration.

[0033] 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. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A high-precision PCD tool for machining valve plates, characterized in that: Includes a blade body (1), on which a plurality of PCD blades (2) are arranged around the circumference. The length of the PCD blades (2) is four times the width of the valve plate oil groove (3) so that the PCD blades (2) can always contact the valve plate reinforcing ribs (4) to provide support.

2. The high-precision PCD tool for machining valve plates according to claim 1, characterized in that: The length L5 of the PCD blade (2) is 15-25mm.

3. The high-precision PCD tool for machining valve plates according to claim 1, characterized in that: The radial drop between the blade body (1) and the PCD blade (2) is L9 = 0.015-0.025mm.

4. The high-precision PCD tool for machining valve plates according to claim 1, characterized in that: The blade body (1) is provided with four or six PCD blades (2) around its circumference, and the PCD blades (2) are evenly distributed around its circumference.

5. The high-precision PCD tool for machining valve plates according to claim 1, characterized in that: The blade body (1) is provided with a mounting groove, and the PCD blade (2) is welded into the mounting groove.

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