CN-122008129-A - Lightweight high-strength electric hammer drill and preparation process thereof

CN122008129ACN 122008129 ACN122008129 ACN 122008129ACN-122008129-A

Abstract

The invention discloses a lightweight high-strength electric hammer drill and a preparation process thereof, and belongs to the technical field of electric hammer drills. The invention relates to a lightweight high-strength electric hammer drill which comprises an electric hammer drill and an electric hammer drill body, wherein a cutting bit is arranged at the front end of the electric hammer drill body, a carbon fiber composite rod is arranged in a hollow drill rod, and a penetrating rod is arranged between the carbon fiber composite rod and the electric hammer drill body. The invention solves the problems that the weight of the existing drill bit influences the operation in the actual use process and the service life of the drill bit cannot be ensured in long-term working, and the abrasion-resistant service life of the electric hammer drill bit main body is improved by the introduction of the ceramic tool bit, so that the ceramic tool bit has extremely strong abrasion resistance when drilling reinforced concrete, and the three-dimensional braided carbon fiber structure can effectively resist the impulse impact load of an electric hammer, so that the electric hammer drill bit main body is not easy to delaminate and crack under high-frequency impact and has excellent toughness performance.

Inventors

ZHU WENPING
LI TAIJUN
CHEN KAI
Jia Rongfang

Assignees

江苏正宇工具有限公司

Dates

Publication Date: 20260512
Application Date: 20260326

Claims (9)

1. The utility model provides a lightweight high strength electric hammer drill, includes electric hammer rig (4) and electric hammer drill bit main part (1), its characterized in that, electric hammer drill bit main part (1) set up the front end at electric hammer rig (4), just cutting bit (2) are installed to the front end of electric hammer drill bit main part (1), hollow drill rod (3) are installed to the rear end of electric hammer drill bit main part (1), hollow drill rod (3) stretch into in electric hammer rig (4) and pass through retaining member fixed connection with electric hammer rig (4), be provided with carbon fiber composite rod (305) in hollow drill rod (3), install between carbon fiber composite rod (305) and the electric hammer drill bit main part (1) and run through pole (303).
2. The lightweight high-strength electric hammer drill according to claim 1, wherein the surface of the electric hammer drill body (1) is provided with an integrally formed spiral groove (101), the pitch and groove depth of the spiral groove (101) vary along the length direction of the drill rod, the groove depth of a chip removal inlet section of the spiral groove (101) is shallower than the groove depth of a chip removal outlet section, the groove depth of the chip removal middle section of the spiral groove (101) is shallower than the groove depth of the chip removal outlet section, the pitch of the chip removal inlet section of the spiral groove (101) is smaller than the pitch of the chip removal middle section, and the pitch of the chip removal middle section of the spiral groove (101) is smaller than the pitch of the chip removal outlet section.
3. The lightweight high-strength hammer drill according to claim 1, wherein the front end of the hammer bit body (1) is provided with an integrally formed locking groove (102), the rear end of the cutting bit (2) is provided with an integrally formed taper barb (203), the taper barb (203) is embedded into the locking groove (102) to be embedded with the hammer bit body (1), the rear end of the cutting bit (2) is provided with a fastening mounting groove (201), and the inner wall of the fastening mounting groove (201) and the surface of the taper barb (203) are both provided with wear-resistant layers.
4. The lightweight high-strength hammer drill according to claim 1, wherein an integrally formed mounting through hole (301) is formed between the hammer bit body (1) and the hollow drill rod (3), an integrally formed connecting hole (302) is formed in the hollow drill rod (3), and the penetrating rod (303) penetrates through the connecting hole (302) to be respectively in abutting connection with the hammer bit body (1) and the hollow drill rod (3).
5. The lightweight high-strength hammer drill according to claim 4, wherein a locking screw (304) is arranged between the hollow drill rod (3) and the hammer drill bit body (1), and the locking screw (304) is fixedly connected with the hammer drill bit body (1) and the hollow drill rod (3) through threads respectively.
6. The lightweight high-strength electric hammer drill according to claim 5, wherein an integrally formed ceramic tool bit (202) is arranged at the upper end of the cutting tool bit (2), the ceramic tool bit (202) is embedded in the cutting tool bit (2) and fixedly connected with the cutting tool bit (2) through threads, a composite coating is arranged on the surface of the ceramic tool bit (202), and the composite coating is formed by overlapping and combining a TiAlN multilayer film and a DLC coating.
7. The lightweight high-strength electric hammer drill according to claim 6, wherein a clamping block (306) is installed between the hollow drill rod (3) and the carbon fiber composite rod (305), the clamping block (306) is respectively in butt connection with the hollow drill rod (3) and the carbon fiber composite rod (305), and a buffering damping cushion layer is arranged in the clamping block (306).
8. The lightweight high-strength electric hammer drill according to claim 7, wherein an integrally formed weight reduction through hole (307) is formed in the inner side of the carbon fiber composite rod (305), and the bottom end of the carbon fiber composite rod (305) is fixedly connected with the penetrating rod (303) through threads.
9. A process for manufacturing a lightweight high strength electric hammer drill according to claim 8, comprising the steps of: The method comprises the steps of precisely forging to obtain blanks of an electric hammer drill bit main body (1) and a hollow drill rod (3), forging a penetrating rod (303), and reserving machining allowance for a locking groove (102); step two, a locking groove (102) for mechanical interlocking is machined by utilizing a numerical control lathe and a machining center, the roughness of the inner wall of the locking groove (102) is controlled within Ra1.6, the junction of the electric hammer bit main body (1) and the hollow drill rod (3) is precisely turned, the step difference is eliminated, the smooth transition of the outer diameter of the drill rod is ensured, and the stress concentration is reduced; Step three, adopting laser etching to process microscopic pits and grooves on the joint surface of the electric hammer bit main body (1), and processing and forming a connecting port (302) to enhance the anchoring effect of connection; Step four, eliminating processing stress, refining grains, preparing for subsequent heat treatment, heating to 920 ℃ at the rate of 8-10 ℃ per second, preserving heat, rapidly cooling in a special quenching medium to obtain a high-hardness martensitic structure, eliminating quenching stress through step tempering, stabilizing the size, and finally enabling the electric hammer drill bit main body (1) to keep high hardness and have enough toughness; Fifthly, carrying out sand blasting treatment on the joint surface of the locking groove (102) and the mounting through hole (301); Step six, weaving carbon fibers into tubular prefabricated bodies, putting the woven carbon fiber prefabricated bodies into a precise die by adopting a resin transfer molding process, and injecting low-viscosity high-temperature resin under vacuum negative pressure to ensure that the resin fully infiltrates each fiber, so as to prepare a carbon fiber composite rod (305); Step six, placing the infiltrated mold into an autoclave, and carrying out stepped heating and curing according to a curing curve of the resin; Step seven, acetone degreasing is carried out on the joint surface of the mounting through hole (301), polishing or plasma treatment is carried out on the connecting end of the carbon fiber tube, a release agent is removed, the surface is activated, the connecting strength is improved, the penetrating rod (303) is penetrated, the penetrating rod (303) is locked through internal threads, and an interference fit locking screw (304) is driven to fix the carbon fiber composite rod (305), the hollow drill rod (3) and the electric hammer drill bit main body (1); coating a TiAlN multilayer film and a DLC coating on a taper barb (203) of a ceramic tool bit (202), forming a brazeable fastening mounting groove (201) surface by high-temperature sintering, assembling the taper barb (203) of the metallized ceramic tool bit (202) with a locking groove (102), and heating in a vacuum furnace; and step nine, assembling the electric hammer drill bit main body (1) of the connection combination into an electric hammer drill (4) to finish the preparation work.

Description

Lightweight high-strength electric hammer drill and preparation process thereof Technical Field The invention relates to the technical field of electric hammer drills, in particular to a lightweight high-strength electric hammer drill and a preparation process thereof. Background The hammer drill converts the rotation torque of the motor into the reciprocating motion of the piston through a cam crankshaft and other mechanisms, so that the hammer drill impacts the drill bit to strike, and meanwhile the drill bit keeps rotating. Compared with a percussion drill, the electric hammer vibrates less, the power is usually above 13.5 amperes, a special square or round bit handle with a clamping groove is adopted to prevent loosening, the drill bit is usually made of metal, and the cambered surface at the bottom is designed at an acute angle, so that rock breaking is facilitated, but reaming is not facilitated. The Chinese patent with the publication number of CN210858588U discloses a lightweight disposal drill bit for the extrusion type rapid well construction of a groundwater monitoring well, which comprises a drill bit body, a bearing table and a connector, wherein the bearing table is arranged between the drill bit body and the connector, and the center points of the drill bit body, the bearing table and the connector are on the same axis. The drill bit body, the bearing table and the connector are integrally formed. The abandoning drill bit of this patent is the well drill bit of building of lightweight design as integrated into one piece design, is favorable to the reaming, has strengthened the stability of drill bit to satisfy weight reduction, reduce cost and mass production requirement, solved the drill bit and easily droing, be unfavorable for the reaming, only can bear limited pressure in boring, and because the drill bit bottom basically does not bear the problem that the influence is caused to the drill bit stability. In the practical use process of the drill bit body, the weight of the drill bit influences the operation, the service life of the drill bit cannot be guaranteed in long-term working, and therefore the existing requirements are not met, and a lightweight high-strength electric hammer drill and a preparation process thereof are provided. Disclosure of Invention The invention aims to provide a lightweight high-strength electric hammer drill and a preparation process thereof, and solves the problems that the weight of a drill bit influences the operation in the actual use process and the service life of the drill bit cannot be guaranteed in long-term working of the drill bit body provided in the background art. In order to achieve the purpose, the technical scheme is that the lightweight high-strength electric hammer drill comprises an electric hammer drill and an electric hammer drill body, wherein the electric hammer drill body is arranged at the front end of the electric hammer drill, a cutting tool bit is arranged at the front end of the electric hammer drill body, a hollow drill rod is arranged at the rear end of the electric hammer drill body, the hollow drill rod stretches into the electric hammer drill and is fixedly connected with the electric hammer drill through a locking piece, a carbon fiber composite rod is arranged in the hollow drill rod, and a penetrating rod is arranged between the carbon fiber composite rod and the electric hammer drill body. Preferably, the surface of the electric hammer drill bit main body is provided with an integrally formed spiral groove, the pitch and the groove depth of the spiral groove change along the length direction of the drill rod, the groove depth of the chip removal inlet section of the spiral groove is shallower than the groove depth of the chip removal middle section, the groove depth of the chip removal middle section of the spiral groove is shallower than the groove depth of the chip removal outlet section, the pitch of the chip removal inlet section of the spiral groove is smaller than the pitch of the chip removal middle section, and the pitch of the chip removal middle section of the spiral groove is smaller than the pitch of the chip removal outlet section. Preferably, the front end of the electric hammer bit body is provided with an integrally formed locking groove, the rear end of the cutting bit is provided with an integrally formed taper barb, the taper barb is embedded into the locking groove to be embedded with the electric hammer bit body, the rear end of the cutting bit is provided with a fastening mounting groove, and the inner wall of the fastening mounting groove and the surface of the taper barb are both provided with wear-resistant layers. Preferably, an integrally formed mounting through hole is formed between the electric hammer bit main body and the hollow drill rod, an integrally formed connecting hole is formed in the hollow drill rod, and the penetrating rod penetrates through the connecting hole to be respectively