A PCD grinding head with grinding teeth

Abstract

The present application discloses a PCD grinding head with grinding teeth, comprising a grinding head base and a grinding head fixedly connected; wherein a chip chamber is provided inside the grinding head, and a chip groove is provided on the outer surface of the chip chamber; the chip groove is connected to the chip chamber; the end of the grinding head is composed of a plurality of grinding teeth; the grinding teeth include tooth edges and tooth grooves arranged alternately; the grinding head base is made of cemented carbide material, and the grinding head is made of PCD material. The grinding head provided in the present application processes the end face of the entire PCD grinding head into a cutting edge with a certain angle, and designs the end face into a grinding tooth structure. On the premise of enhancing its own strength and wear resistance, it can also improve the grinding sharpness of the grinding head, and can also prevent slipping between the grinding head and the product to be processed, and has high hole grinding efficiency and quality.

Description

Technical Field

[0001] The invention relates to the technical field of machining tools, and in particular to a PCD grinding head with grinding teeth. Background Art

[0002] In recent years, with the development of science and technology, the requirements of the machinery manufacturing industry for processing accuracy have been continuously improved. As a commonly used tool for grinding holes, the structure of the grinding head not only determines its own strength and service life, but also determines the error size and accuracy of the ground holes.

[0003] PCD (polycrystalline diamond) grinding heads have gradually gained attention in the industry due to their high hardness, better grinding sharpness, and longer service life. The emergence of PCD grinding heads first involved coating diamond particles on the surface of a metal substrate (such as cemented carbide) through processes such as electroplating for grinding. Although this process has improved the sharpness of the grinding head to a certain extent, it still cannot solve the problem of stable bonding between the diamond particles and the substrate, which is prone to particle detachment and affects the service life of the grinding head. For this reason, grinding head products with a whole piece of PCD as the grinding core have emerged, which can not only give full play to the high hardness and high strength of PCD materials, but also avoid the problem of particle detachment.

[0004] However, when using a whole piece of PCD to process products, due to its relatively smooth surface, its anti-slip degree of grinding is significantly reduced compared to a PCD grinding head coated with diamond particles. During processing, the grinding head often "slips" with the product to be processed, affecting the drilling quality and also reducing the drilling efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a PCD grinding head with grinding teeth to solve the problems of low drilling quality and low efficiency caused by the "slippage" phenomenon of the PCD grinding head in the prior art, while further improving the sharpness of the grinding head.

[0006] The present application provides a PCD grinding head with grinding teeth, comprising a grinding head base and a grinding head fixedly connected; wherein:

[0007] A chip chamber is provided inside the grinding head;

[0008] The outer surface of the chip chamber is provided with a chip removal groove; the chip removal groove is communicated with the chip chamber;

[0009] The end of the grinding head is composed of a plurality of grinding teeth; the grinding teeth include tooth edges and tooth grooves arranged alternately;

[0010] The grinding head base is made of cemented carbide material, and the grinding head is made of PCD material.

[0011] Optionally, the cross-section of the grinding tooth along the diameter direction of the grinding head is formed by a connecting edge, an outer edge, a first outer chamfered edge, a second outer chamfered edge, an inner chamfered edge and a limiting edge connected in sequence; wherein, the first outer chamfered edge and the second outer chamfered edge form an outer chamfer; the inner chamfered edge and the vertical direction form an inner chamfer; the limiting edge and the center axis of the grinding head form a limiting angle; and the second outer chamfered edge and the inner chamfered edge form a cutting edge angle.

[0012] Optionally, the cutting edge angle is in the range of 60° to 130°.

[0013] Optionally, the grinding head base and the grinding head are formed as one piece by welding.

[0014] Optionally, the chip removal grooves are provided in plurality and are evenly distributed along the outer circumference of the chip chamber.

[0015] Optionally, the axial depth of the chip cavity is at least 1.5 times the grinding depth.

[0016] Optionally, the width ratio of the tooth groove to the tooth edge is 1:3-20.

[0017] The PCD grinding head with grinding teeth provided in this application has the following beneficial effects:

[0018] 1. The grinding head is made of a whole piece of PCD material, which has higher strength and service life, and the structure is stable;

[0019] Second, the chip chamber and chip groove can make the generated grinding chips enter the chip chamber along the limit angle during the grinding operation and be discharged by the chip groove, thus avoiding the influence of grinding chips on the quality of the hole wall and improving the grinding quality;

[0020] 3. The grinding tooth structure formed by the tooth edge and tooth groove increases the grinding force with the product to be processed, and can increase the sharpness of the grinding head by reducing the cutting edge angle of the grinding teeth, improve the hole grinding efficiency, and can also increase the strength of the grinding head by increasing the cutting edge angle of the grinding teeth, avoid rapid wear or collapse of the cutting edge, and increase the service life;

[0021] Fourth, the opening of the chip groove is in a "trumpet-mouth" shape due to the setting of the limiting angle, which can not only reduce the grinding resistance of the grinding head, but also guide the chips, thereby completing the limiting effect of the grinding head and improving the stability of the grinding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1This is a schematic diagram of the structure of a PCD grinding head with grinding teeth in this application;

[0024] Figure 2 for Figure 1 A right side view of a PCD grinding head with grinding teeth is shown;

[0025] Figure 3 This is an enlarged view of the local structure of the grinding head position in a PCD grinding head with grinding teeth in this application;

[0026] Among them, 1-grinding head base, 2-chip groove, 3-grinding head, 31-grinding tooth, 3101-connecting edge, 3102-outer edge, 3103-first outer chamfer edge, 3104-second outer chamfer edge, 3105-inner chamfer edge, 3106-limiting edge, 311-tooth edge, 312-tooth groove, 313-outer chamfer, 314-inner chamfer, 315-limiting angle, 316-cutting edge angle, 4-chip cavity. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 , is a schematic structural diagram of a PCD grinding head with grinding teeth in the present application;

[0029] See also Figure 2 ,for Figure 1 A right side view of a PCD grinding head with grinding teeth is shown;

[0030] Depend on Figure 1 and Figure 2 It can be seen that the embodiment of the present application provides a PCD grinding head with grinding teeth, including a grinding head base 1 and a grinding head 3 that are fixedly connected; in the present embodiment, the function of the grinding head base 1 is to provide fixation and connection with the PCD grinding head drive mechanism. The specific shape of the grinding head base 1 is not limited here. It should be considered that under the premise of ensuring high connection strength and economy, a grinding head base 1 of suitable specifications is selected according to actual requirements. The material of the grinding head base 1 can be made of cemented carbide material, or other commonly used grinding head materials; the grinding head 3 is mainly responsible for the grinding of the workpiece, and a hole is opened in the workpiece (such as glass) through the cutting edge at the end of the grinding head 3. The grinding head 3 is made of PCD material. Due to the special structural form provided in the present application, its processing method can adopt a laser engraving method, which can ensure that the size accuracy of the processed grinding head 3 is high.

[0031] A chip cavity 4 is provided inside the grinding head 3; the depth of the chip cavity 4 along the axial direction of the grinding head can be less than the length of the grinding head 3 of the PCD material, or can be greater than the length of the grinding head 3 of the PCD material. It should be noted that the grinding head provided in the present application is mainly used for processing through holes. After the grinding head begins to contact the workpiece, as the depth of the grinding head inserted into the workpiece gradually increases, the generated grinding chips can gradually accumulate in the chip cavity and are not discharged temporarily. After a certain amount of grinding chips accumulates in the chip cavity, the excess grinding chips can be discharged along the position near the upper end of the chip cavity, so as not to affect the hole wall being processed and ensure the processing quality of the hole wall; when the through hole is opened, a part of the workpiece that has not been processed remains in the cavity inside the grinding head 3. This part has been separated from the parent material and can be discharged from the open end of the chip cavity 4.

[0032] The outer surface of the chip chamber 4 is provided with a chip groove 2; the chip groove 2 is connected to the chip chamber 4; specifically, the chip groove 2 is used to discharge grinding chips, so the discharge outlet position of the chip groove 2 should be avoided as much as possible from the position in the hole being processed, so that when the hole is processed, it can be ensured that the outlet of the chip groove 2 is always located outside the workpiece, so that the grinding chips are discharged from the outside of the workpiece.

[0033] The end of the grinding head 3 is composed of a plurality of grinding teeth 31; the grinding teeth 31 include tooth edges 311 and tooth grooves 312 arranged alternately; in the present embodiment, the structural purpose of setting the tooth edges and tooth grooves is to enable the grinding head edge to be processed into a preset angle and to enhance the cutting sharpness of the grinding head, and the tooth grooves can promote the heat dissipation and chip removal of the grinding head and at the same time reduce the contact area between the grinding head and the product to be processed, that is, to increase the grinding pressure value of the tooth edge on the surface to be processed, thereby increasing the grinding effect and preventing "slipping".

[0034] See also Figure 3 , is a partial structural enlarged diagram of the grinding head position in a PCD grinding head with grinding teeth of the present application;

[0035] Depend on Figure 3It can be seen that in a feasible embodiment, the grinding head 3 of the present application can adopt this structural form: the cross section of the grinding tooth 31 along the diameter direction of the grinding head is formed by the connecting edge 3101, the outer edge 3102, the first outer chamfered edge 3103, the second outer chamfered edge 3104, the inner chamfered edge 3105 and the limiting edge 3106 connected in sequence; the surface where the connecting edge 3101 is located is used to connect with the grinding head base 1, the surface where the outer edge 3102 is located is the contact surface with the grinding hole, the first outer chamfered edge 3103 and the second outer chamfered edge 3104 form an outer chamfer 313; the inner chamfered edge 3105 is connected to the vertical direction An inner chamfer 314 is formed; due to the outer chamfer 313 and the inner chamfer 314, the cutting edge position of the grinding head 3 has a certain angle and is sharper; the limiting edge 3106 and the central axis of the grinding head form a limiting angle 315, and under the action of the limiting angle 315, the grinding chips can gradually move and accumulate above the chip chamber along the direction of the limiting angle, preventing the grinding chips from moving between the grinding head and the product to be processed; the second outer chamfer edge 3104 and the inner chamfer edge 3105 form a cutting edge angle 316; further, according to different actual processing requirements, the cutting edge angle 316 can take a value in the range of 60° to 130°.

[0036] Furthermore, in order to ensure that the grinding head of the present application has a high bonding strength, in a feasible embodiment, the grinding head base 1 and the grinding head 3 are formed into one piece by welding. Specifically, a binder (such as copper-tin-titanium alloy powder, silver-copper-titanium alloy powder, etc., which are used in brazing and sintering processes) can be filled between the parts, and the welding connection can be implemented under a high temperature and high pressure environment. In addition, the specific structure of the connection surface between the grinding head base 1 and the grinding head 3 is not limited in this embodiment. For example, the contact surface can be changed from a plane to a key-groove, a toothed structure, a nested structure, etc., to increase the bonding area of ​​the welding connection to increase the bonding effect.

[0037] Furthermore, the chip removal groove 2 is not provided with only one, but may be provided with multiple, and the multiple chip removal grooves 2 are evenly distributed along the outer circumferential direction of the chip chamber 4. This can increase the chip removal efficiency, prevent excessive grinding chips from being stored in the chip groove and being discharged from the grinding hole position when it is difficult to remove the chips. At the same time, it should be noted that when the number of chip removal grooves increases, the strength of the grinding head 3 will decrease. Therefore, the number of chip removal grooves should be reasonably set according to actual needs, and the effect is better when the number of chip removal grooves is four.

[0038] Furthermore, the axial depth of the chip cavity 4 is at least 1.5 times the grinding depth; the deeper axial depth of the chip cavity can meet the storage and chip removal requirements of a large amount of grinding chips, especially for products to be processed with relatively thick thickness. When the thickness increases, its depth also increases accordingly.

[0039] Furthermore, in order to increase cutting sharpness, the design of the grinding teeth may be optimized. For example, the width ratio of the tooth groove 312 to the tooth edge 311 may be set to 1:3-20, thereby obtaining a better grinding effect.

[0040] It can be seen from the above technical scheme that the present application provides a PCD grinding head with grinding teeth, including a grinding head base and a grinding head that are fixedly connected; wherein a chip chamber is provided inside the grinding head, and a chip groove is provided on the outer surface of the chip chamber; the chip groove is connected to the chip chamber; the end of the grinding head is composed of a plurality of grinding teeth; the grinding teeth include tooth edges and tooth grooves arranged alternately; the grinding head base is made of cemented carbide material, and the grinding head is made of PCD material. The grinding head provided in the present application processes the end face of the entire PCD grinding head into a cutting edge with a certain angle, and designs the end face into a grinding tooth structure. On the premise of enhancing its own strength and wear resistance, it can also improve the grinding sharpness of the grinding head, and can also prevent slipping between the grinding head and the product to be processed, and has high hole grinding efficiency and quality.

[0041] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0042] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A PCD grinding head with grinding teeth, characterized in that: It comprises a grinding head base (1) and a grinding head (3) which are fixedly connected; wherein: The grinding head (3) is provided with a chip holding chamber (4) inside; The outer surface of the chip chamber (4) is provided with a chip removal groove (2); the chip removal groove (2) is in communication with the chip chamber (4); The end of the grinding head (3) is composed of a plurality of grinding teeth (31); the grinding teeth (31) include tooth edges (311) and tooth grooves (312) arranged alternately; The grinding head base (1) is made of a hard alloy material, and the grinding head (3) is made of a PCD material; The cross section of the grinding tooth (31) along the diameter direction of the grinding head is formed by a connecting edge (3101), an outer edge (3102), a first outer chamfered edge (3103), a second outer chamfered edge (3104), an inner chamfered edge (3105) and a limiting edge (3106) connected in sequence; wherein the first outer chamfered edge (3103) and the second outer chamfered edge (3104) form an outer chamfer (313); the inner chamfered edge (3105) forms an inner chamfer (314) with the vertical direction; the limiting edge (3106) forms a limiting angle (315) with the central axis of the grinding head; and the second outer chamfered edge (3104) and the inner chamfered edge (3105) form a cutting edge angle (316).

2. A PCD grinding head with grinding teeth according to claim 1, characterized in that: The cutting edge angle (316) is in the range of 60° to 130°.

3. A PCD grinding head with grinding teeth according to claim 1, characterized in that: The grinding head base (1) and the grinding head (3) are integrally formed by welding.

4. A PCD grinding head with grinding teeth according to claim 1, characterized in that: The chip removal grooves (2) are provided in plurality and are evenly distributed along the outer circumference direction of the chip containing cavity (4).

5. A PCD grinding head with grinding teeth according to claim 1, characterized in that: The axial depth of the chip cavity (4) is at least 1.5 times the grinding depth.

6. A PCD grinding head with grinding teeth according to claim 1, characterized in that: The width ratio of the tooth groove (312) to the tooth edge (311) is 1:3-20.

Images