A slot face grinding wheel

Abstract

The application discloses a slotted end face grinding wheel, which comprises two installation surfaces oppositely arranged on two sides of the grinding wheel and a connecting surface connected between the two installation surfaces, wherein the connecting surface comprises an end face and an outer cylindrical surface, a plurality of grooves extending to the end face and the outer cylindrical surface are arranged on the installation surface close to the end face, the grooves are arranged in the circumferential direction of the grinding wheel, and an included angle beta between a projection line of a groove bottom surface and a projection line of the outer cylindrical surface is 45-70 degrees in the cross section of the grinding wheel. When the grinding wheel is worn and needs to be repaired, the grooves are repaired together, the depth of the grooves after the repair is unchanged, and the grooves do not need to be repeatedly slotted, so that the machining efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of grinding tools, and more particularly to a grinding wheel with a grooved end face. Background Technology

[0002] Grinding wheels are the most important type of abrasive tool in grinding processes. The most widely used and common grinding wheels currently available have only one grinding end face, such as... Figure 1 As shown, the grinding end face and the front and rear mounting surfaces of the grinding wheel are perpendicular. According to the applicant's data on grinding burns of this type of grinding wheel over the past two years, 83% of the burns are end face burns. For parts prone to end face burns, end face grooving is usually used for prevention. In the prior art, annular grooves are made along the end face. End face grooving requires manual leveling, resulting in shallow and uneven grooves with inconsistent distribution, leading to unstable dynamic balance of the grinding wheel. Simultaneously, since the grinding wheel axis is perpendicular to the machining end face, the grinding wheel wears along the axis, thinning and causing the grooves to disappear. The annular grooves on the end face will disappear during machining and grinding wheel dressing, requiring repeated grooving, leading to decreased machining efficiency and excessive dynamic balance of the grinding wheel. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a grinding wheel with end face grooving that maintains the same groove depth after dressing.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A grooved grinding wheel includes mounting surfaces disposed opposite to each other on both sides of the grinding wheel, and a connecting surface connecting the two mounting surfaces. The connecting surface includes an end face and an outer circular surface. A plurality of grooves extending to the end face and the outer circular surface are formed on the mounting surface near the end face. The grooves are spaced apart along the circumference of the grinding wheel. On the cross-section of the grinding wheel, there is an included angle β between the projection lines of the lower surface of the groove and the outer circular surface, satisfying 45°≤β≤70°.

[0006] As a further improvement to the above technical solution:

[0007] The end face and the outer circular surface are connected by a circular arc R.

[0008] Let the width of the grinding wheel end face be H, and the thickness of the grinding wheel be s1, satisfying H=(s1 / sinβ-s1)×tanβ.

[0009] Let the groove depth be h, satisfying h=(H+R)×cosβ+q, where q is the shortest distance from the intersection of the end face and the outer circular face on the cross section of the grinding wheel to the bottom of the groove.

[0010] Let the groove length be l and the minimum usable radius of the grinding wheel be r, satisfying l=r+h×tanβ.

[0011] When the diameter of the grinding wheel is less than 100mm, the number of grooves is 4 to 8; when the diameter of the grinding wheel is 100 to 600mm, the number of grooves is 8 to 36; and when the diameter of the grinding wheel is greater than 600mm, the number of grooves is 36 to 64.

[0012] The slots are symmetrically distributed on the mounting surface.

[0013] The width of the groove on the side near the grinding wheel mounting surface is m1, and the width of the groove on the side near the center of the grinding wheel is m2, satisfying that m2 < m1.

[0014] The axis of symmetry of the groove may or may not pass through the center of the grinding wheel.

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] The end-face grooved grinding wheel of the present invention has a connecting surface including an end face and an outer circular surface. The groove and the outer circular surface have an included angle. The groove on the mounting surface extends to the end face and the outer circular surface. When the grinding wheel is worn and needs to be dressed, the grinding wheel center axis is rotated by a deflection angle of 90°-β to dress the end face and the groove on the grinding wheel together. The groove depth remains unchanged after dressing, eliminating the need for repeated grooving and resulting in high processing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an existing conventional grinding wheel, in which... Figure 1 (a) Front view Figure 1 (b) is a sectional view.

[0018] Figure 2 This is a schematic diagram of the structure of the grinding wheel in Embodiment 1 of the present invention, wherein... Figure 2 (a) Front view Figure 2 (b) is a sectional view.

[0019] Figure 3 This is a schematic diagram of the grinding wheel before and after dressing according to Embodiment 1 of the present invention, wherein... Figure 3 (a) Before repair Figure 3 (b) is after repair.

[0020] Figure 4 This is a schematic diagram of the structure of the grinding wheel in Embodiment 2 of the present invention, wherein... Figure 4 (a) Front view Figure 4 (b) is a sectional view.

[0021] Figure 5 This is a schematic diagram of the structure of the grinding wheel in Embodiment 3 of the present invention.

[0022] The labels in the diagram represent:

[0023] 1. Grinding wheel; 11. Mounting surface; 12. End face; 13. Outer cylindrical surface; 14. Groove. Detailed Implementation

[0024] The present invention will be further described in detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0025] In the description of this application, it should be understood that the terms "length", "width", "upper", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0026] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," 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 application according to the specific circumstances.

[0027] Example 1

[0028] like Figure 2 and Figure 3 As shown, the end face grooved grinding wheel of this embodiment includes mounting surfaces 11 disposed opposite to each other on both sides of the grinding wheel 1, and a connecting surface connecting the two mounting surfaces 11. The connecting surface includes an end face 12 and an outer circular surface 13. A plurality of grooves 14 extending from the inner side of the mounting surface 11 to the end face 12 and the outer circular surface 13 are provided on the mounting surface 11 near the end face 12. The grooves 14 are arranged circumferentially along the grinding wheel 1. On the cross section of the grinding wheel 1, there is an included angle β between the projection lines of the grooves 14 and the outer circular surface 13, which satisfies 45°≤β≤70°. The end-face grooved grinding wheel of the present invention has a connecting surface including an end face 12 and an outer circular surface 13. The groove 14 and the outer circular surface 13 have an included angle β. The groove on the mounting surface 11 extends to the end face 12 and the outer circular surface 14. When the grinding wheel 1 is worn and needs to be dressed, the central axis of the grinding wheel 1 is rotated by a deflection angle of 90°-β, and the end face 12 and the groove 13 on the grinding wheel 1 are dressed together. The groove depth remains unchanged after dressing, and there is no need to repeat grooving, resulting in high processing efficiency.

[0029] On the cross-section of the grinding wheel 1, let A0 be the distance from the intersection of the projection lines of the end face 12 and the outer circular surface 13 to the center of the grinding wheel 1, and let A1 and A2 be the distances from the intersection of the projection lines of the end face 12 and the outer circular surface 13 with the projection lines of the two mounting surfaces 11 to the center of the grinding wheel 1, respectively, satisfying A0-A1>0 and A0-A2>0. With this configuration, compared to the conventional configuration where the end face 12 of the grinding wheel 1 is perpendicular to the mounting surface 11, the end face 12 and the outer circular surface 13 are convex outwards.

[0030] When dressing grinding wheel 1, it has a deflection angle α, which satisfies α = 90° - β, and the value of α ranges from 20° to 45°.

[0031] Let the width of the end face 12 of the grinding wheel 1 be H (referring to the length of the projection line of the end face 12 on the cross section of the grinding wheel 1), and the thickness of the grinding wheel 1 be s1, satisfying H=(s1 / sinβ-s1)×tanβ.

[0032] The grooves 14 are symmetrically distributed on the mounting surface 11.

[0033] In this embodiment, the groove 14 has the same width in the depth direction. That is, if the width of the groove 14 near the mounting surface 11 of the grinding wheel 1 is m1, and the width of the groove 14 near the center of the grinding wheel 1 is m2, then m2 = m1. In other words, the groove 14 is a strip groove, and the axis of symmetry of the groove 14 passes through the center of the grinding wheel 1.

[0034] Let the groove length of groove 14 be l, and the minimum usable radius of grinding wheel 1 be r (when in use, the grinding wheel 1 still has groove 14, such as...). Figure 3 As shown in (a), on the cross-section of the grinding wheel 1, a parallel line parallel to the projection line of the end face 12 is drawn from the starting point of the inner side of the groove 14 (the direction closer to the central axis of the grinding wheel 1) towards the mounting surface 11. The distance between the intersection of this parallel line and the projection line of the bottom surface of the groove 14 and the central axis of the grinding wheel 1 is the minimum usable radius r of the grinding wheel 1, satisfying l=r+h×tanβ, ensuring that heat dissipation can still be maintained even when the diameter of the grinding wheel 1 is at its minimum. When the length of the groove 14 is at its longest, the inner side of the groove 14 ends outside the grinding wheel fixture.

[0035] Considering both the durability of the grinding wheel 1 and the need to improve heat dissipation, the number of grooves 14 is 4 to 8 when the diameter of the grinding wheel 1 is less than 100 mm, 8 to 36 when the diameter of the grinding wheel 1 is 100 to 600 mm, and 36 to 64 when the diameter of the grinding wheel 1 is greater than 600 mm.

[0036] The number of grooves 14 is even, which helps to reduce the dynamic balance changes after dressing and after the grinding wheel 1 is blocked.

[0037] In this embodiment, the grinding wheel 1 has a diameter of 500mm, an initial thickness of 63mm, a height (H) of 20mm, a groove depth (h) of 12mm (there is no transition arc between the end face 12 and the outer circular surface 13), a deflection angle (α) of 30°, a minimum usable diameter of 360mm, a groove width (2mm) of 14, 18 grooves (18 in total), a starting point of 14 159mm from the central axis, and a minimum diameter (318mm) along the length of the groove from the central axis of the grinding wheel 1 to the groove 14. The groove length (l) is 90.8mm.

[0038] Dressing method: Based on the deflection angle α of grinding wheel 1 during dressing, set the dressing depth Dp = x of outer circular surface 13, then the dressing depth dp of end face is x × tanα, so that the grinding wheel 1 and the groove 14 are dressed synchronously.

[0039] When Dp = 0.02 mm (radial direction)

[0040] The end face trimming amount dp = 0.02 × tan30° = 0.0116 mm.

[0041] Example 2

[0042] like Figure 4 As shown, the end-face slotted grinding wheel in this embodiment is largely the same as that in Embodiment 1, with the following two differences:

[0043] 1. The end face 12 and the outer circular face 13 are not connected, but are transitioned by a circular arc R.

[0044] The depth of groove 14 in the direction of grinding wheel thickness s1 is groove depth h, which satisfies h=(H+R)×cosβ+q, where q is the shortest distance from the intersection of end face 12 and outer circular face 13 on the cross section of grinding wheel 1 to the bottom surface of groove 14.

[0045] 2. The groove 14 is trapezoidal in the direction of its depth. Let the width of the groove 14 near the mounting surface 11 of the grinding wheel 1 be m1, and the width of the groove 14 near the center of the grinding wheel 1 be m2. It satisfies that m2 < m1. That is to say, the groove 14 is smaller inside and larger outside, forming a trapezoid. This is beneficial to improving the chip removal capacity and preventing grinding debris from clogging the groove 14.

[0046] In other embodiments, the groove 14 may be V-shaped, U-shaped, or other shapes in the groove depth direction, and the same or similar technical effects may be achieved.

[0047] Example 3

[0048] like Figure 5 As shown, the end-face grooved grinding wheel in this embodiment is largely the same as that in Embodiment 1, except that the axis of symmetry of the groove 14 does not pass through the center of the grinding wheel 1. Thus, the groove 14 has an offset relative to the center of the grinding wheel 1, which improves the chip removal capability of the groove 14.

[0049] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A grooved grinding wheel, comprising mounting surfaces (11) disposed opposite to each other on both sides of the grinding wheel (1), and a connecting surface connecting the two mounting surfaces (11), characterized in that: The connecting surface includes an end face (12) and an outer circular surface (13). On the mounting surface (11) near the end face (12), a plurality of grooves (14) extending to the end face (12) and the outer circular surface (13) are provided. The grooves (14) are spaced apart circumferentially along the grinding wheel (1). On the cross section of the grinding wheel (1), there is an angle β between the projection line of the lower surface of the groove (14) and the projection line of the outer circular surface (13), which satisfies 45°≤β≤70°. Let the width of the end face (12) of the grinding wheel (1) be H, and the thickness of the grinding wheel (1) be s1, satisfying H=(s1 / sinβ-s1)×tanβ; When the diameter of the grinding wheel (1) is less than 100 mm, the number of grooves (14) is 4 to 8. When the diameter of the grinding wheel (1) is 100 to 600 mm, the number of grooves (14) is 8 to 36. When the diameter of the grinding wheel (1) is greater than 600 mm, the number of grooves (14) is 36 to 64.

2. The grinding wheel according to claim 1, characterized in that: The end face (12) and the outer circular face (13) are connected by a circular arc R.

3. The grinding wheel according to claim 2, characterized in that: Let the groove depth h of the groove (14) satisfy h = (H+R)×cosβ+q, where q is the shortest distance from the intersection of the end face (12) and the outer circular face (13) on the cross section of the grinding wheel (1) to the bottom of the groove (14).

4. The grinding wheel according to claim 2, characterized in that: Let the groove length of the groove (14) be l, and the minimum usable radius of the grinding wheel (1) be r, satisfying l=r+h×tanβ.

5. The grinding wheel according to any one of claims 1 to 4, characterized in that: The grooves (14) are symmetrically distributed on the mounting surface (11).

6. The grinding wheel according to any one of claims 1 to 4, characterized in that: The width of the groove (14) near the mounting surface (11) of the grinding wheel (1) is m1, and the width of the groove (14) near the center of the grinding wheel (1) is m2, satisfying that m2 < m1.

7. The grinding wheel according to any one of claims 1 to 4, characterized in that: The axis of symmetry of the groove (14) does not pass through the center of the grinding wheel (1).

8. The grinding wheel according to any one of claims 1 to 4, characterized in that: The axis of symmetry of the groove (14) passes through the center of the grinding wheel (1).

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