CN105290465A - Crossed grooves located and double-screw locked crown drilling blade - Google Patents

Abstract

The invention relates to a cross-groove positioning double-screw locking crown drill blade, which includes a working end and a mounting end, and the working end is processed with a first blade positioning surface, a second blade positioning surface, a third blade positioning surface, and a fourth blade positioning surface , the first blade positioning surface and the second blade positioning surface are distributed symmetrically about the center of the blade axis, the third blade positioning surface and the fourth blade positioning surface are distributed symmetrically about the center of the blade axis, forming two sets of intersecting surfaces; the mounting end of the crown drill blade Set two fastening surfaces symmetrically; the working end is provided with a spiral blade flute and blade edge, and the blade edge and the blade flute are a section of helical cylindrical surface with the same lead and a width; the working end There is a helical protective knife edge, which is a helical surface with a width of the same lead as the chip flute of the blade and a rake angle of -15°～0°; the working end is provided with a main cutting edge, transition A cutting edge consisting of a sharp edge, an inner edge and a chisel edge. The double-sided side pressure locking method can withstand greater clamping force, and the blade can be clamped reliably.

Description

Cross groove positioning double screw locking crown drill insert

technical field

The invention relates to a cross groove positioning double screw locking tooth crown drill blade.

Background technique

The crown drill bit is a combined drill bit in which the head is made of cemented carbide or other high-performance materials, and the drill rod is made of alloy steel. It has the advantages of low cost of use and large processing range.

At present, there are many combinations of the head and the drill pipe of the crown drill bit. For example, there are many forms such as "column pin positioning, screw through locking", "cross V-shaped surface positioning, rear pull screw locking", "open pin positioning, non-screw rotation clamping" and many other forms. These positioning and locking methods have their own characteristics, or have complex structures, high production costs, poor reliability, and limited application ranges.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a cross-groove positioning double-screw locking crown drill blade.

The purpose of the present invention is achieved through the following technical solutions:

Cross-groove positioning double screws lock the crown drill blade, which is characterized in that: the crown drill blade includes a working end and a mounting end connected with the same blade axis as the center, and the first blade is processed on the working end of the crown drill blade The positioning surface, the second blade positioning surface, the third blade positioning surface, and the fourth blade positioning surface, the first blade positioning surface and the second blade positioning surface are distributed symmetrically with the center of the blade axis, the third blade positioning surface and the fourth blade positioning surface The center of the blade axis is symmetrically distributed to form two sets of intersection surfaces; two fastening surfaces are symmetrically arranged at the installation end of the crown drill blade; the fastening surface forms an included angle with the blade axis;

The working end of the crown drill blade is provided with a helical blade chip removal groove and a blade edge, and the blade edge and the blade chip removal groove are a section of helical cylindrical surface with the same lead and a width;

The working end of the crown drill blade is provided with a helical protective knife edge, which is a section of helical surface with a width having the same lead as the chip removal groove of the blade and a rake angle of -15°～0°;

The working end of the crown drill insert is provided with a cutting edge consisting of a main cutting edge, a transition edge, an inner edge and a chisel edge, the intersection line of the chip flute and the flank of the insert forms the main cutting edge, and the The intersection line forms a chisel edge, and a transition edge and an inner edge are ground between the main cutting edge and the chisel edge.

Further, the above-mentioned intersecting groove positioning double screws lock the crown drill blade, wherein the first blade positioning surface and the second blade positioning surface, or the third blade positioning surface and the fourth blade positioning surface of the crown drilling blade The included angle is 15°～35°.

Furthermore, the above-mentioned intersecting groove positioning double screw locks the crown drill blade, wherein the fastening surface of the crown drill blade is parallel to the third blade positioning surface or the fourth blade positioning surface in the circumferential direction.

Still further, the above-mentioned intersecting groove positioning double screw locks the crown drill blade, wherein, the angle formed between the fastening surface of the crown drill blade and the blade axis is 2.5°-10°, which is low in the middle and high in the end. form.

Still further, the above-mentioned intersecting groove positioning double screw locks the crown drill blade, wherein the included angle formed between the main cuttings of the crown drill blade is an apex angle, and the apex angle is 180°-90°.

Still further, the above-mentioned intersecting groove positioning double screw locks the crown drill blade, wherein, the helix angle of the chip flute and the blade edge of the crown drill blade is 0°-30°.

The outstanding substantive features and remarkable progress of the technical solution of the present invention are mainly reflected in:

Using the double-sided side pressure locking method, the angle between the fastening surface of the crown drill blade and one of the intersecting grooves of the drill body is 60°-120°, and when the angle is 90°, it can withstand greater clamping force, the crown drill insert clamping is more reliable. The cutting edge of the crown drill insert can be produced in various types according to the actual processing conditions, and has a wide range of applications. It has the characteristics of simple structure, reliable clamping and low cost.

Description of drawings

Figure 1: Schematic diagram of the vertical placement of the axis of the crown drill blade;

Figure 2: Front view schematic diagram of crown drill blade;

Figure 3: A schematic side view of the crown drill insert;

Figure 4: A schematic top view of the crown drill blade;

Figure 5: E-E sectional schematic diagram of Figure 1;

Figure 6: Schematic diagram of the fastening surface of the crown drill insert;

Fig. 7: F-F sectional schematic diagram of Fig. 6 .

detailed description

Below in conjunction with accompanying drawing, technical solution of the present invention will be further described:

As shown in Figures 1 to 7, the cross-groove positioning double screws lock the crown drill blade. The crown drill blade includes a working end 31 and a mounting end 32 connected to the same blade axis 30. The working end 31 of the crown drill blade is The first blade positioning surface 37, the second blade positioning surface 38, the third blade positioning surface 39, and the fourth blade positioning surface 40 are processed, and the first blade positioning surface 37 and the second blade positioning surface 38 are symmetrically distributed around the center of the blade axis 30 , the third blade positioning surface 39 and the fourth blade positioning surface 40 are distributed symmetrically with the center of the blade axis 30, forming two sets of intersection surfaces for matching with the drill body blade groove. When installing, they cooperate with the drill body blade groove to play a positioning role The function can ensure that the crown drill blade is coaxial with the drill body.

The working end 31 of the crown drill insert is provided with a cutting edge composed of a main cutting edge 34, a transition edge 35, an inner edge 36 and a chisel edge 33, and the intersection line of the crown drill insert chip flute 41 and the flank surface forms the main cutting edge. Edge 34, the intersection line of the two flanks forms a chisel edge 33, and a transition edge 35 and an inner edge 36 are ground between the main cutting edge and the chisel edge; the angle formed between the main cutting 34 is the apex angle 46, and the apex angle is 46 It can be made into 180°, 150°, 140°, 130°, 120°, 110°, 100°, 90° or other angles.

The working end 31 of the crown drill blade is provided with a helical crown drill blade chip removal groove 41 and a blade edge 42, and the blade edge 42 and the tooth crown drill blade chip removal groove 41 are a section with the same lead and a certain width. Spiral cylinder. It is mainly used to determine the diameter of the crown drill insert and play a supporting role in the drilling process. The blade edge width can be made from 0.5mm to 3mm. The helix angle 47 of the flute 41 and the edge 42 of the tooth crown drill blade is 0°-30°.

The intersection of the chip flute 41 and the edge 42 of the tooth crown drill blade is usually treated as a section of helical surface with a rake angle of -15° to 0° with a certain width, which is called the protective edge 43, which can play a role in drilling. The role of edge protection. Wherein the protective knife edge width 44 is made into 1mm～3mm, and the protective knife edge rake angle 45 is made into -15°～0°. Further, the protective knife edge 43 can be rounded and blunt to enhance its wear resistance.

The included angle 53 of the intersection plane formed by the first blade positioning surface 37 and the second blade positioning surface 38 or the third blade positioning surface 39 and the fourth blade positioning surface 40 is 15°˜35°.

The installation end 32 of the crown drill blade is symmetrically provided with two fastening surfaces 51, which are used to bear the clamping force of the fastening screw during installation.

The fastening surface 51 forms an included angle 48 with the blade axis 30, and the included angle 48 is 2.5°-10°, which is in the form of a low center and a high end. When the fastening screw is clamped, a clamping force of Fy is formed. According to the principle of mechanics, Fy will form two component forces of Fx and Fh. The Fh component force can make the crown drill blade stick to the drill body along the axis direction, ensuring the clamping reliability. The section line 52 of the fastening surface 51 on the F-F section is parallel to the third blade positioning surface 39 or the fourth blade positioning surface 40 in the circumferential direction.

When assembling, the installation end 32 of the crown drill blade is placed in the fastening hole of the drill body blade, the two sets of intersection surfaces of the working end 31 of the crown drill blade are positioned and matched with the drill body blade groove, and the fastening screw is screwed into the drill body screw hole The center is in contact with the fastening surface 51, so that the crown drill blade is fastened on the drill rod.

Using the double-sided side pressure locking method, the angle between the fastening surface of the crown drill blade and one of the intersecting grooves is 60°~120°. When the angle is 90°, it can withstand greater clamping force. Crown drill insert clamping is more reliable. The cutting edge of the crown drill insert can be produced in various types according to the actual processing conditions, and has a wide range of applications. It has the characteristics of simple structure, reliable clamping and low cost.

It should be understood that: the above is only a preferred embodiment of the present invention, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (6)

1. Cross-groove positioning double-screw locking crown drill blade, characterized in that: the crown drill blade includes a working end and a mounting end connected with the same blade axis as the center, and the working end of the crown drill blade is processed with The first blade positioning surface, the second blade positioning surface, the third blade positioning surface, the fourth blade positioning surface, the first blade positioning surface and the second blade positioning surface are distributed symmetrically with the center of the blade axis, the third blade positioning surface and the fourth blade positioning surface The positioning surface of the blade is distributed symmetrically to the center of the blade axis, forming two sets of intersection surfaces; two fastening surfaces are symmetrically arranged at the installation end of the crown drill blade; the fastening surface forms an included angle with the blade axis; The working end of the crown drill blade is provided with a helical blade chip removal groove and a blade edge, and the blade edge and the blade chip removal groove are a section of helical cylindrical surface with the same lead and a width; The working end of the crown drill blade is provided with a helical protective knife edge, which is a section of helical surface with a width having the same lead as the chip removal groove of the blade and a rake angle of -15°～0°; The working end of the crown drill insert is provided with a cutting edge consisting of a main cutting edge, a transition edge, an inner edge and a chisel edge, the intersection line of the chip flute and the flank of the insert forms the main cutting edge, and the The intersection line forms a chisel edge, and a transition edge and an inner edge are ground between the main cutting edge and the chisel edge. 2. The cross-groove positioning double-screw locking crown drill blade according to claim 1, characterized in that: the first blade positioning surface and the second blade positioning surface, or the third blade positioning surface of the crown drill blade The included angle with the positioning surface of the fourth blade is 15°-35°. 3. The cross-groove positioning double-screw locking crown drill blade according to claim 1, characterized in that: the fastening surface of the crown drill blade is positioned with the third blade positioning surface or the fourth blade in the circumferential direction face parallel. 4. The intersecting groove positioning double-screw locking crown drill blade according to claim 1, characterized in that: the angle formed between the fastening surface of the crown drill blade and the blade axis is 2.5°-10°, which is A form that is low in the middle and high in the end. 5. The intersecting groove positioning double-screw locking crown drill blade according to claim 1, characterized in that: the included angle formed between the main cutting of the crown drill blade is an apex angle, and the apex angle is 180°～ 90°. 6 . The intersecting groove positioning double-screw locking crown drill insert according to claim 1 , wherein the helix angle of the chip flute and the edge of the crown drill insert is 0°-30°.