Tool shank structure and steel plate drill

Abstract

The utility model provides a tool handle type structure and steel plate drill relates to tool technical field, including handle part, the outer circle of handle part is provided with positioning groove and positioning flat, positioning groove is used for the steel ball of clamp to enter, it has an open end and positioning end, the depth of positioning groove gradually increases from open end to positioning end, the angle theta between the bottom surface of positioning groove and the axis of handle part, 0 < theta < 90, positioning flat is the plane structure of setting on the outer circle of handle part. By setting positioning groove at handle part outer circle, when handle part cooperates with clamp, axial movement and rotary displacement are limited through positioning groove, when handle part is clamped and pre -tensioned, after pulling pre -tensioning effect is produced, makes handle part end surface and clamp end surface close, improves positioning accuracy and positioning reliability.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to cutting tool shank structure and steel plate drill. Background Technology

[0002] Traditional steel plate drills and other drill bit tools do not have a back tension function in their shank type, which results in generally poor positioning accuracy and reliability after the fixture and tool holder are engaged. This application is made to address the above-mentioned defects. Utility Model Content

[0003] The purpose of this utility model is to provide a tool shank structure and a steel plate drill. By setting a positioning groove, the shank will generate a backward pre-tensioning effect when it is clamped and pre-tightened, thereby improving the positioning accuracy and positioning reliability.

[0004] To solve the above problems, this utility model provides a tool shank structure, including a shank. The outer circle of the shank is provided with a positioning groove and a positioning flat. The positioning groove is used for the steel ball of the clamp to enter. It has an open end and a positioning end. The depth of the positioning groove gradually increases from the open end to the positioning end, forming an inclined bottom. The extension line of the bottom surface of the positioning groove has an angle θ with the axis of the shank, 0° < θ < 90°. The positioning flat is a planar structure set on the outer circle of the shank. When it is installed with the clamp, the positioning flat is used for axial positioning and rotational positioning, which plays a role in restricting the degree of freedom, thereby realizing the fastening and clamping function.

[0005] By setting the positioning groove to an θ degree, the handle is subjected to a backward pre-tensioning effect when it is clamped and pre-tightened, so that the end face of the handle comes into contact with the end face of the clamp, thereby improving the positioning accuracy and positioning reliability.

[0006] According to one embodiment of the present invention, the outer circle of the handle is provided with a clearance groove, which is used to prevent the outer circle of the handle from getting stuck with the clamp when the fastening point of the positioning groove and the positioning flat undergoes plastic deformation.

[0007] According to one embodiment of the present invention, the cross-sectional shape of the positioning groove is an arc, a trapezoid, or a V-shape.

[0008] Furthermore, the clearance groove is a groove that is annularly set on the outer circle of the handle. The setting of the clearance groove can be determined according to the shape of the positioning groove. When the positioning groove 1 adopts a trapezoidal or V-shaped groove and the force support point is moved down, and the deformation zone does not affect the outer circle of the handle, the clearance groove can be set or not. When the positioning groove adopts an arc shape, it is preferable to set the clearance groove.

[0009] According to one embodiment of the present invention, 1 to 4 positioning slots are provided, preferably 3.

[0010] According to one embodiment of the present invention, when the number of positioning grooves is greater than 1, they can be evenly or non-evenly distributed on the outer circle of the handle, preferably 3, and they are evenly distributed.

[0011] According to one embodiment of the present invention, 5° < θ < 30°.

[0012] According to one embodiment of the present invention, the planar shape of the positioning flat is rectangular or trapezoidal, preferably trapezoidal.

[0013] According to one embodiment of the present invention, the plane of the positioning flat is parallel to the outer circle axis of the handle, or forms a certain angle structure with the outer circle axis of the handle, preferably the plane is parallel to the outer circle axis of the handle.

[0014] According to one embodiment of the present invention, 1 to 4 positioning flats are provided, and their number may be the same as or different from the number of positioning slots, preferably one.

[0015] Plate drills, including the aforementioned tool holder type structure.

[0016] The beneficial effect of this utility model is that by setting a positioning groove on the outer circle of the handle, and setting an angle θ between the extension line of the positioning groove and the axis of the handle, when the handle is engaged with the clamp, the axial movement and rotational displacement are restricted by the positioning groove. When the handle is clamped and pre-tightened, a back-pulling pre-tightening effect is generated, so that the end face of the handle is close to the end face of the clamp, thereby improving the positioning accuracy and positioning reliability. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of the tool holder type.

[0019] Figure 2 A schematic diagram of the positioning flat section of a tool shank-type structure;

[0020] Figure 3 This is a partial sectional view of the tool shank structure;

[0021] Figure 4 for Figure 3 Schematic diagram of the cross section at point AA;

[0022] Figure 5 This is a schematic diagram showing the fit between the fixture and the tool holder structure.

[0023] Figure 6 for Figure 5 Schematic diagram of the structure at point BB. Detailed Implementation

[0024] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0025] Example 1:

[0026] Tool shank type structure and plate drill, such as Figures 1-4 It includes a handle, and the outer circle of the handle is provided with a positioning groove 1 and a positioning flat 2. Whether or not a clearance groove 3 is provided can be determined according to the shape of the positioning groove 1.

[0027] The positioning groove 1 is used for the steel ball 5 of the clamp to enter. It has an open end 11 and a positioning end 12. The depth of the positioning groove 1 gradually increases from the open end 11 to the positioning end 12, forming a sloping bottom, such as... Figure 3 The extension line of the bottom surface of the positioning groove has an angle θ with the axis of the handle, 0° < θ < 90°, preferably 5° < θ < 30°.

[0028] The cross-sectional shape of the positioning groove 1 can be an arc, trapezoid, or V-shape. In this embodiment, it is set to an arc shape. The number of grooves can be 1 to 4, preferably 3. The arrangement on the outer circle of the handle can be uniform or non-uniform. In this embodiment, the uniform arrangement is preferred.

[0029] The positioning flat 2 is a planar structure set on the outer circle of the handle. When it is installed with the clamp, the positioning flat 2 is used for axial positioning and rotational positioning, which restricts the degree of freedom and thus realizes the function of fastening and clamping.

[0030] The clearance groove 3 is used to prevent the outer circle of the handle from jamming with the fixture when the fastening points of the positioning groove 1 and the positioning flat 2 undergo plastic deformation. It avoids jamming by reducing the diameter of the handle at the positioning flat 2 and the positioning groove 1. The clearance groove 3 is a groove that is set in a ring on the outer circle of the handle. The setting of the clearance groove 3 can be determined according to the shape of the positioning groove 1. When the positioning groove 1 adopts a trapezoidal or V-shaped groove, the clearance groove can be set when the force support point is moved down and the deformation zone does not affect the outer circle of the handle. The clearance groove 3 is set when the positioning groove 1 adopts an arc shape.

[0031] Radial positioning is achieved through the outer circle of the handle, followed by axial and rotational positioning through the positioning groove 1, which restricts the degree of freedom and provides a fastening and clamping function. The axial movement is restricted by the angle θ between the positioning groove 1 and the handle's circular axis, and the rotational displacement is restricted by the side wall of the positioning groove 1. This causes the handle to be pre-tensioned during clamping, ensuring that the end face of the handle is against the end face of the clamp, thus improving positioning accuracy and reliability. The positioning flat 2 provides axial and rotational positioning, which also restricts the degree of freedom and provides a fastening and clamping function. The clearance groove 3 prevents the outer circle of the handle from jamming with the clamp when the fastening points of the positioning groove 1 and the positioning flat 2 undergo plastic deformation.

[0032] like Figure 5 , Figure 6 When assembling the cutting tool with the fixture (the fixture is existing technology), the outer sleeve 1 of the fixture rotates and uses the grooves on it to squeeze the steel ball 2, causing the steel ball 2 to move down and press into the positioning groove 1, thereby restricting the rotational movement and axial displacement of the shank. When the shank is clamped and pre-tightened, it generates a backward pre-tightening effect, so that the end face of the shank comes into contact with the end face of the fixture, improving the positioning accuracy and positioning reliability.

[0033] Example 2:

[0034] Based on Embodiment 1, in this embodiment, the planar shape of the positioning flat 2 can be rectangular or trapezoidal, the positioning flat 2 can be set in a way that the plane is parallel to the outer circle axis of the handle, or forms a certain angle structure with the outer circle axis of the handle, and the number of the positioning flat 2 can be set in one or more groups or the same number as the positioning groove 1.

[0035] Example 3:

[0036] Based on Embodiment 2, the positioning flat 2 preferably adopts a configuration where the plane is parallel to the outer circle axis of the handle, and the number of such configurations is one set.

[0037] A steel plate drill, including the tool shank structure and tool body 6 in any of the above embodiments.

[0038] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A tool shank type structure, characterized in that: The device includes a handle, the outer circle of which is provided with a positioning groove (1) and a positioning flat (2). The positioning groove (1) is used for the steel ball of the clamp to enter, and it has an open end (11) and a positioning end (12). The depth of the positioning groove (1) gradually increases from the open end (11) to the positioning end (12). The bottom surface of the positioning groove (1) has an angle θ with the axis of the handle, 0° < θ < 90°. The positioning flat (2) is a planar structure provided on the outer circle of the handle.

2. The tool shank structure according to claim 1, characterized in that: The outer circle of the handle is provided with a clearance groove (3), which is used to prevent the outer circle of the handle from jamming with the clamp when the fastening points of the positioning groove (1) and the positioning flat (2) undergo plastic deformation.

3. The tool shank structure according to claim 1 or 2, characterized in that: The cross-sectional shape of the positioning groove (1) is circular, trapezoidal or V-shaped.

4. The tool shank structure according to claim 1 or 2, characterized in that: The positioning slot (1) is provided in 1 to 4 places.

5. The tool shank structure according to claim 1, characterized in that: When the number of positioning grooves (1) is greater than 1, they can be evenly or non-evenly distributed on the outer circle of the handle.

6. The tool shank structure according to claim 1 or 2, characterized in that: 5° < θ < 30°.

7. The tool shank structure according to claim 1 or 2, characterized in that: The planar shape of the positioning flat (2) is rectangular or trapezoidal.

8. The tool shank structure according to claim 7, characterized in that: The plane of the positioning flat (2) is parallel to the outer circle axis of the handle, or forms a certain angle structure with the outer circle axis of the handle.

9. The tool shank structure according to claim 7, characterized in that: The positioning flat (2) is provided in 1 to 4 units.

10. A steel plate drill, characterized in that: Includes the tool holder type structure as described in any one of claims 1-9.

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