Minimally lubricated solid carbide chambering and chamfering composite drill bit

Abstract

The utility model relates to the technical field of machining tools, in particular to a minimum quantity lubrication solid carbide chambering and chamfering composite drill bit which comprises a drill bit body, the drill bit body is composed of a drill bit front end, a middle portion and a tail portion, an inner cooling channel is arranged inside the drill bit body, and the drill bit front end, the middle portion, the tail portion and the inner cooling channel are utilized to conduct chambering and chamfering on the drill bit body. By adopting an inner-cooling integral hard alloy bar with a single straight hole, after the drilling bit main body is slotted, electric sparks are used for punching towards a machining blade part in the slot to form a jet hole, and meanwhile, an end hole is plugged in a finished product, so that minimal quantity lubricating liquid can be accurately jetted to a machining part during machining, the leakage of the minimal quantity lubricating liquid in the drilling bit main body is avoided, and the machining efficiency is improved. And meanwhile, a segmented machining mode is adopted for reaming, abrasion of a cutting edge is delayed, the service life of the tool is prolonged, and the problems that in the prior art, reaming and orifice chamfering are machined in a split mode, the coaxial precision is poor, and efficiency is low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of processing tools, in particular to a micro-lubricated integral carbide hole-reaming and chamfering composite drill bit. Background Art

[0002] Minimum quantity lubrication technology has been widely used in the field of solid carbide turning and drilling due to its environmental friendliness and economy. However, in terms of hole expansion, due to the limitations of the bar cooling holes, the coolant cannot be sprayed to the processing part, and its advantages are not fully utilized.

[0003] In the prior art, hole enlarging and hole chamfering are processed by separate cutters, which results in poor coaxial accuracy and low efficiency.

[0004] Therefore, it is particularly important to design a micro-lubricated solid carbide hole enlarging and chamfering composite drill to change the above technical defects and improve overall practicality. Utility Model Content

[0005] The purpose of the utility model is to provide a minimally lubricated integral carbide hole enlarging and chamfering composite drill bit to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A minimally lubricated integral carbide hole-reaming and chamfering composite drill comprises a drill body consisting of a front end, a middle part, and a tail part; an internal cooling channel is provided inside the drill body.

[0008] As a preferred solution of the present invention, the drill bit body is made of hard alloy material, which has high strength and wear resistance.

[0009] As a preferred solution of the present invention, the inner cooling channel is provided with a single straight hole for introducing a minimal amount of lubricating fluid.

[0010] As a preferred solution of the present invention, the front end of the drill bit is a rough expansion part, which is used to preliminarily expand the hole diameter; the middle part is a chamfering setting, which is used for fine expansion and forming the chamfer of the hole wall; the tail part is set as a chamfering structure, which is used to ensure the smoothness and coaxiality of the chamfer of the hole mouth.

[0011] As a preferred solution of the present invention, a plurality of slots are provided on the drill body, and a plurality of injection holes are provided inside the slots near the front end of the drill, and the injection holes are punched using electric spark drilling technology.

[0012] As a preferred solution of the present invention, an end port of the inner cooling channel away from the front end of the drill bit is provided with a special plug for sealing the end hole.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. In the utility model, a micro-lubricated integral carbide hole reaming and chamfering composite drill bit is set up, and the structure of the front end, middle part, tail and internal cooling channel of the drill bit is utilized. By adopting an internally cooled integral carbide rod with a single straight hole, after the groove of the drill bit body is completed, electric sparks are used to punch holes in the groove toward the processing edge to form injection holes. At the same time, the end holes are plugged before the finished products are put into storage, ensuring that the micro-lubricating fluid can be accurately sprayed to the processing part during processing, avoiding the leakage of micro-lubricating inside the drill bit body, facilitating the use of micro-lubricating cooling during hole reaming, and at the same time, the hole reaming adopts a segmented processing method to delay the wear of the cutting edge and improve the tool life, thereby solving the problems of poor coaxial accuracy and low efficiency in the existing technology of hole reaming and hole chamfering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a planar structural diagram of the utility model as a whole including an inner cooling channel;

[0016] Figure 2 It is a plan view of the drill bit body of the utility model;

[0017] Figure 3 This is an enlarged schematic diagram of point A of the present invention.

[0018] In the figure: 1, drill body; 101, front end of drill bit; 102, middle part; 103, tail; 104, internal cooling channel. DETAILED DESCRIPTION

[0019] The following will combine 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, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. Several embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] For examples, see Figure 1-3 , the utility model provides a technical solution:

[0024] A minimally lubricated, solid carbide reaming and chamfering composite drill bit comprises a drill body 1, which is composed of a front end 101, a middle portion 102, and a tail portion 103. An internal cooling channel 104 is provided inside the drill body 1. When the drill body 1 is mounted on an external machine tool or tool holding device, minimal lubrication fluid is introduced through the single straight hole internal cooling channel 104 provided inside the drill body 1 at the start of machining. As the drill bit rotates and feeds, the coarse expansion portion of the front end 101 of the drill bit first contacts the workpiece. , initially expanding the aperture to lay a good foundation for subsequent processing, then the chamfer design of the middle part 102 begins to play a role, and fine expansion and hole wall chamfering are carried out to reduce the deviation and roughness of the aperture. At the same time, the drill body 1 is provided with a number of slots and the spray holes inside it, which use the electric spark drilling technology to evenly spray a small amount of lubricant to the processing part to reduce the cutting temperature. Finally, the chamfer design of the hole mouth of the tail part 103 ensures the smoothness and coaxiality of the hole mouth, thereby improving the processing accuracy and overall quality of the workpiece.

[0025] The front end 101 of the drill bit is a rough expansion part for preliminarily expanding the hole diameter, the middle part 102 is a chamfering setting for fine expansion and forming the hole wall chamfer, and the tail part 103 is a chamfering structure for ensuring the smoothness and coaxiality of the hole mouth chamfer. The rough expansion design of the front end 101 of the drill bit can preliminarily expand the hole diameter, providing a good foundation for subsequent fine processing. The chamfering design of the middle part 102 can realize the precise expansion and chamfering of the hole wall, thereby improving the processing accuracy and surface quality. The fine expansion process helps to further reduce the deviation and roughness of the hole diameter, while the formation of the hole wall chamfer helps to improve the assembly performance and appearance quality of the workpiece. The chamfering design of the tail part 103 ensures the smoothness and coaxiality of the hole mouth part, thereby improving the processing accuracy and overall quality of the workpiece. This design helps to reduce assembly problems caused by uneven hole mouth or coaxiality deviation, thereby improving the reliability and service life of the product.

[0026] Specifically, the drill body 1 is made of cemented carbide material with high strength and wear resistance, which enables the drill bit to withstand higher cutting forces and wear during the processing, thereby extending the service life of the drill bit. The internal cooling channel 104 is a single straight hole setting for passing a minimal lubricant. The minimal lubrication technology improves the quality of the processed surface and reduces the cutting force.

[0027] Furthermore, a plurality of grooves are provided on the drill body 1, and a plurality of injection holes are provided inside the grooves near the front end 101 of the drill bit. The injection holes adopt electric spark drilling technology to evenly spray a small amount of lubricating fluid to the processing part. The end port of the internal cooling channel 104 away from the front end 101 of the drill bit is provided with a special plug seal for the end hole to ensure that the small amount of lubricating fluid can be accurately sprayed to the processing part during processing, to avoid leakage of the small amount of lubrication inside the drill body, and to realize the use of small amount of lubrication cooling during hole expansion processing.

[0028] The working process of the present utility model is as follows: when using this kind of micro-lubricated integral carbide hole reaming and chamfering composite drill bit, the drill body 1 is first installed on an external machine tool or tool clamping device. At the beginning of processing, a micro-lubricant is introduced through the single straight hole internal cooling channel 104 provided inside the drill body 1. As the drill bit rotates and feeds, the rough expansion part of the front end 101 of the drill bit first contacts the workpiece, preliminarily expanding the aperture, laying a good foundation for subsequent processing. Then the chamfering design of the middle part 102 begins to play a role, and fine expansion and hole wall chamfering are carried out to reduce the deviation and roughness of the aperture. At the same time, the several slots and the spray holes inside the drill body 1 use electric spark drilling technology to evenly spray micro-lubricant to the processing part to reduce the cutting temperature. Finally, the chamfering design of the hole mouth of the tail 103 ensures the smoothness and coaxiality of the hole mouth part, thereby improving the processing accuracy and overall quality of the workpiece.

[0029] The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. The control method is controlled by a controller, and the control circuit of the controller can be realized through simple circuit connection by technicians in this field. It is common knowledge in this field, so this application document will no longer explain the control method and circuit connection in detail.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A micro-lubricated solid carbide hole-reaming and chamfering composite drill bit, comprising a drill bit body (1), characterized in that: The drill bit body (1) is composed of a drill bit front end (101), a middle part (102), and a tail part (103); an internal cooling channel (104) is provided inside the drill bit body (1).

2. The minimally lubricated solid carbide hole-reaming and chamfering composite drill bit according to claim 1, characterized in that: The drill bit body (1) is made of hard alloy material and has high strength and wear resistance.

3. The minimally lubricated solid carbide hole-reaming and chamfering composite drill bit according to claim 1, characterized in that: The inner cooling channel (104) is provided as a single straight hole for introducing a minimal amount of lubricating fluid.

4. The minimally lubricated solid carbide hole-reaming and chamfering composite drill bit according to claim 1, characterized in that: The front end (101) of the drill bit is a rough expansion part for initially expanding the hole diameter, the middle part (102) is a chamfering setting for fine expansion and forming the hole wall chamfer, and the tail part (103) is a chamfering structure for ensuring the smoothness and coaxiality of the hole mouth chamfer.

5. The minimally lubricated solid carbide hole-reaming and chamfering composite drill bit according to claim 1, characterized in that: The drill bit body (1) is provided with a plurality of slots, and a plurality of injection holes are provided inside the slots near the front end (101) of the drill bit, and the injection holes are punched using an electric spark drilling technology.

6. The minimally lubricated solid carbide hole-reaming and chamfering composite drill bit according to claim 1, characterized in that: An end port of the inner cooling channel (104) away from the front end (101) of the drill bit is provided with a special plug for sealing the end hole.

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