CN111390734A

CN111390734A - Grinding device for processing inner hole axial chute

Info

Publication number: CN111390734A
Application number: CN202010341264.9A
Authority: CN
Inventors: 苏子林; 赵万胜; 林红旗
Original assignee: Ludong University
Current assignee: Ludong University
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2020-07-10
Anticipated expiration: 2040-04-27
Also published as: CN111390734B

Abstract

The invention relates to a grinding device for processing an inner hole axial chute, belonging to the technical field of grinding processing. The grinding device can be arranged on a hammer drill, can process a plurality of inner hole axial chutes at one time in an outdoor construction site, ensures the relative position precision, and can be used for processing fragile materials and hard materials. The substrate of the abrasive disc provided by the invention is abutted against and extrudes the surface of the inner hole of the processed workpiece under the elastic force action of the elastic body to carry out grinding processing, so that the abrasive disc can be adaptive to different inner hole diameters, and the processing convenience is improved. The invention fully utilizes the elastic deformation of the rubber spring to drive the grinding disc to generate axial vibration and cutting motion, can effectively recycle the vibration energy and improve the grinding efficiency. The processing method can process the inner hole axial chute starting from any axial position, and solves the technical problem that the grinding plate damages the surface of the inner hole. The grinding device can also be used for grinding the surface of the inner hole, and has wide application range.

Description

Grinding device for processing inner hole axial chute

Technical Field

The invention relates to a processing device of an inner hole axial groove, in particular to a grinding processing device, and belongs to the technical field of grinding processing.

Background

The inner hole axial grooves of the parts are of various types, such as single key grooves, spline grooves and various guide grooves. At present, broaching, slotting, stamping, linear cutting and other special processing methods are adopted for processing the axial grooves of the inner holes, and special machine tools, dies and cutting tools are required to be processed in workshops of factories.

The inner hole axial chute is also an inner hole variable cross section chute with different axial positions and depths. In order to improve the processing technology of the deep-hole variable cross-section groove, the invention patent with the application number of 201310271562.5 provides a broach for processing the variable cross-section groove of a standing-retreating rod, which comprises a body for supporting the whole broach; the body is also connected with a core and a cutter holder in a sliding way; the core is connected with a push rod for transmitting the radial feeding power of the broach and a screw rod for transmitting the pretightening force of the push rod; the screw rod is connected with a spiral spring for providing the pretightening force of the push rod, a gasket for bearing the reaction force of the pretightening force and a special nut; the broach adopts the chute type structure, can accomplish the processing of little, the processing of the high processing requirement variable cross section groove of pole of standing back of hole aperture. The technical scheme of the invention needs the push rod to provide radial feeding power of the broaching tool, and also needs the pull rod to be connected with the body to transmit the pulling force and the torque of the broaching machine and generate axial cutting motion; the pull rod and the push rod are respectively and independently controlled and need to be arranged on a special broaching machine to carry out the processing operation of the variable cross-section groove of the parking rod.

In order to ensure reliable locking and stopping functions of the screw, the invention patent with the application number of 201911130365.5 provides a screw assembly with reliable locking and stopping functions, wherein the wing pieces of the gasket are in interference fit with the inclined grooves of the through hole connecting piece, and no fit clearance exists, so that the screw has reliable locking and stopping functions relative to the through hole connecting piece, has no locking clearance, and can be tightly connected with a fragile and thin-walled hollow connected piece. The technical scheme of the invention needs to process an axial skewed slot on the inner wall of the through hole of the connected piece; an embodiment of the internal bore axial chute is configured as shown in fig. 1.

For the connected parts of brittle and brittle materials and hard materials, such as glass, ceramics, concrete, masonry, carbon tool steel and alloy tool steel, only cutting or special machining methods are used, requiring special equipment and cutting tools. Due to the wide application of the screw, the screw is often required to be installed on an outdoor construction site after drilling on the site, equipment conditions of a workshop are not provided, corresponding technical difficulties exist, and improvement is required.

Disclosure of Invention

The invention aims to provide a grinding device for processing an inner hole axial chute, which can be arranged on a known hammer drill and can process the inner hole axial chute on an outdoor construction site, does not need special equipment and can process brittle and fragile materials and hard materials. The orientation described in this specification is based on the position shown in fig. 2, the left side is front, the right side is back, the left side is near the reader, otherwise, the right side is near the axis, the inside is near the axis, otherwise, the outside is near the axis; and so on. The specific technical scheme of the invention is as follows.

The utility model provides a grinding device of processing hole axial chute, contains push-and-pull rod 1, rubber spring 2, swivel nut 3, abrasive disc 4, sleeve 5 and cone nut 6, as shown in figure 2, the mountable is in the hammer drill, can once only process a plurality of hole axial chutes at outdoor job site to ensure the relative position precision of hole axial chute, can be used to the processing of fragile material of fragility and hard material, can different hole diameters of self-adaptation. The brittle and brittle materials at least comprise glass, ceramics, concrete and masonry; the hard material comprises at least a carbon tool steel and an alloy tool steel.

The push-pull rod 1 is a circular stepped rod and comprises a handle section 11, a rear clamping section 12, a guide section 13 and a front clamping section 14, wherein the axes of the handle section 11, the rear clamping section 12, the guide section 13 and the front clamping section 14 are overlapped, and axial guide grooves 15 are formed in the front part of the rear clamping section 12, the rear parts of the guide section 13 and the front clamping section 14, so that the abrasive disc 4 is accommodated, a guide and driving effect is provided for the axial cutting motion and the radial feeding motion of the abrasive disc 4, and the grinding processing of an axial inclined groove of an. Furthermore, the push-pull rod 1 is provided with a square handle four-pit structure at the rear part of the handle section 11, and is connected with a hammer drill through the square handle four-pit structure so as to obtain axial impact force and generate axial reciprocating push-pull motion to grind the inner hole axial inclined groove.

The handle section 11 is of a cylindrical structure, and a square handle four-pit structure is arranged at the rear part of the handle section to be connected with a hammer drill.

Back centre gripping section 12 is cylindrical structure, at rear end and 11 fixed connection of handle section, and the diameter is less than handle section 11, can penetrate rubber spring 2, forms ring shape step face at the front end of handle section 11 to realize rubber spring 2's axial positioning through the step face of handle section 11 front end. The rear clamping section 12 is provided with an external thread, and the rubber spring 2 is axially fastened through the matching of the external thread and the thread sleeve 3.

The guide section 13 is of a cylindrical structure, is fixedly connected with the rear clamping section 12 at the rear end, has a diameter smaller than that of the rear clamping section 12, is convenient for the installation and the disassembly of the thread insert 3, is provided with an axial guide groove 15, accommodates the grinding sheet 4 through the guide groove 15, and provides a guide and driving effect for the axial cutting motion and the radial feeding motion of the grinding sheet 4.

Preceding centre gripping section 14 is cylindrical structure, at rear end and direction section 13 fixed connection, and the diameter is less than direction section 13, can penetrate sleeve 5, forms ring shape step face at the front end of direction section 13 to the axial positioning of sleeve 5 is realized through the step face of direction section 13 front end. Further, the front clamping section 14 is provided with an external thread and is matched with the cone nut 6 through the external thread to realize the axial fastening of the sleeve 5.

The guide groove 15 is axially arranged at the rear part of the front clamping section 14 and at the front part of the rear clamping section 12, axially penetrates through the guide section 13, accommodates the grinding sheet 4, provides guiding and driving effects for the axial cutting motion and the radial feeding motion of the grinding sheet 4, and performs grinding processing on the inner hole axial inclined groove.

Rubber spring 2 is the cylinder structure, has end cover 21 at the rear end, penetrates push-pull rod 1's back centre gripping section 12 to realize axial positioning, the terminal surface can with the surface butt around the hole of work piece in the front, produce elastic deformation under the impact of hammer drill, can cushion, avoid damaging the work piece, also can make push-pull rod 1 produce axial vibration, drive abrasive disc 4 produces the reciprocating vibration of axial and cutting motion, effectively recycle axial vibration energy, improve abrasive machining efficiency.

The end cover 21 is provided with an axial through hole in the center, penetrates through the rear clamping section 12 of the push-pull rod 1 through the through hole, is in clearance fit with the rear clamping section 12, and is abutted against the step surface at the front end of the handle section 11 at the rear end, so that the axial positioning of the rubber spring 2 is realized. Furthermore, the end cover 21 is provided with a circular metal disc at the rear end face, and the metal disc is abutted against the step face at the front end of the handle section 11, so that the axial positioning of the rubber spring 2 is realized, the axial vibration of the rear end of the rubber spring 2 relative to the handle section 11 is avoided, the axial vibration and the cutting action of the grinding disc 4 are enhanced, the axial vibration energy of the rubber spring 2 is effectively recycled, and the grinding efficiency is improved.

The thread insert 3 is a circular sleeve, and has an internal thread 31 and a through groove 32 on the inner surface, as shown in fig. 3, and the external thread of the internal thread 31 and the external thread of the rear clamping section 12 are matched, and the external diameter is smaller than the internal diameter of the rubber spring 2 and larger than the diameter of the rubber spring 2 in the through hole of the end cover 21, so that the front end surface of the end cover 21 can be pressed, and the axial fastening of the rubber spring 2 is realized.

The through grooves 32 of the thread insert 3 axially penetrate through the thread insert 3, correspond to the guide grooves 15 one by one, are the same as the width of the guide grooves 15, are aligned with the rear parts of the guide grooves 15 in the circumferential direction in a fastening state, and accommodate the rear lugs of the abrasive discs 4 so as to limit the radial feeding motion range of the abrasive discs 4 and avoid safety accidents caused by the fact that the abrasive discs 4 fall off.

Abrasive disc 4 is rectangular shape sheet structure, has preceding lug at the front end, has back lug at the rear end, contains substrate 41 and elastomer 42, covers the abrasive material layer in the outside portion of substrate 41, through the inner hole surface of abrasive material layer butt and radial extrusion work piece carries out abrasive machining, wraps up elastomer 42 at the inside portion of substrate 41 to through the side and the bottom surface butt of elastomer 42 with guide way 15, but guide way 15 is sealed relatively, avoids abrasive dust and dust to get into, also elastic deformation can take place, produces abrasive machining's radial feed motion, can the different inner hole diameters of self-adaptation, improves abrasive machining efficiency.

Furthermore, the front lug of the grinding sheet 4 extends into the sleeve 5, and the rear lug of the grinding sheet 4 extends into the threaded sleeve 3, so that the radial feed motion range of the grinding sheet 4 is limited, and safety accidents caused by falling off of the grinding sheet 4 are avoided.

Further, the grinding plate 4 has blind holes 43 on the inner side surface of the base plate 41, and a plurality of steel wires 44 are inserted and fixed in the blind holes 43, as shown in fig. 4.

The base sheet 41 has an elongated sheet-like configuration with front lugs at a front end and rear lugs at a rear end, and elastic bodies 42 are wrapped on the surfaces of the front lugs and the rear lugs to form the front lugs and the rear lugs of the abrasive sheet 4, respectively.

Further, the substrate 41 is covered with an abrasive layer at both outer sides and outer sides of the left and right sides; the front end of the outer side surface is closer to the axis of the push-pull rod 1 than the rear end of the outer side surface, the outer side surface inclines relative to the axis of the push-pull rod 1, the outer side surface abuts against and extrudes the surface of the inner hole of the workpiece to be machined under the action of elastic force of the elastic body 42, the inner hole surface of the workpiece to be machined is driven by the guide groove 15 of the push-pull rod 1 to generate axial reciprocating cutting motion, and grinding machining is carried out on the surface of the inner hole of the.

The elastic body 42 is fixedly connected with the substrate 41 at the outer side part and wraps the inner side surface, the inner side parts of the left side surface and the right side surface, the front lug and the rear lug of the substrate 41, so that the abrasive sheet 4 is abutted against and moves relative to the side surface of the guide groove 15 through the elastic body 42, the sealing of the abrasive sheet 4 relative to the guide groove 15 is realized, and the blockage caused by the entering of abrasive dust and dust is avoided.

Further, the elastic body 42 wraps the steel wire 44 at the inner side, the thickness at the inner side is smaller than that at the outer side, and the left and right side surfaces of the inner side are corrugated in the axial direction, as shown in fig. 5, the inner side surface abuts against the bottom surface of the guide groove 15, so that large elastic deformation can be generated along the radial direction, the grinding plate 4 generates radial feeding movement for grinding, the inner hole surface of a workpiece is continuously abutted and pressed, and different inner hole diameters can be self-adapted.

The blind hole 43 is opened on the inner side surface of the substrate 41, extends outward in the radial direction, and inserts and fixes the plurality of steel wires 44 to maintain the relative positions of the steel wires 44 and the substrate 41, and to enhance the elastic force of the elastic body 42 on the inner side portion.

The steel wire 44 has elasticity, one end of the steel wire is inserted into the blind hole 43, the position of the steel wire is kept opposite to the substrate 41, the part exposed out of the blind hole 43 is wrapped by the inner side part of the elastic body 42, the elastic force of the elastic body 42 on the inner side part is enhanced, and the radial feeding power of the grinding sheet 4 in the grinding process is improved, so that the grinding efficiency is improved.

The sleeve 5 is a circular sleeve, an axial groove is formed in the inner surface of the sleeve, the front clamping section 14 of the push-pull rod 1 penetrates through the sleeve, and the rear end face of the sleeve is abutted to the step face at the front end of the guide section 13, so that axial positioning is realized. The axial grooves of the sleeve 5 axially penetrate through the sleeve 5, correspond to the guide grooves 15 one by one, are the same as the width of the guide grooves 15, are aligned with the front parts of the guide grooves 15 in the circumferential direction in a fastening state, and can accommodate front lugs of the grinding discs 4 so as to limit the radial feeding motion range of the grinding discs 4 and avoid safety accidents caused by falling off of the grinding discs 4.

The cone nut 6 is of a round table-shaped structure, an axial through hole is formed in the center of the cone nut, internal threads are formed in the inner surface of the through hole, the internal threads are matched with the external threads of the front clamping section 14, the front end face of the sleeve 5 can be pressed, the sleeve 5 can be fastened axially, the push-pull rod 1 can be guided to enter an inner hole of a machined workpiece conveniently, and grinding processing of an axial inclined groove is conducted. Further, said cone nut 6 is provided with an axial chamfer at the rear of the outer surface for mounting and dismounting the cone nut 6.

The invention discloses a method for processing an inner hole axial chute, which can process the inner hole axial chute starting from any axial position by adopting a grinding device of the invention, ensures the surface quality of an inner hole and avoids damaging the surface of the inner hole, and comprises the following steps:

firstly, roughly machining an inner hole of an axial chute on a workpiece to be machined, and reserving machining allowance; and an inner hole obtained by rough machining is smaller than the design size, and reasonable machining allowance is reserved.

Step two, installing the push-pull rod 1 on a hammer drill through the handle section 11, and plugging the push-pull rod 1 into an inner hole of a processed workpiece to enable the grinding sheet 4 to reach a cutting starting position; the hammer drill is started, and the push-pull rod 1 is driven by the hammer drill to generate axial reciprocating push-pull motion; the push-pull rod 1 drives the abrasive disc 4 to generate axial reciprocating cutting motion through the guide groove 15, and an abrasive layer on the outer side of the substrate 41 abuts against and presses the surface of an inner hole of a workpiece to generate a grinding effect; the elastic body 42 of the grinding sheet 4 is elastically deformed in the radial direction, so that the grinding sheet 4 generates a radial feeding motion and continuously abuts against and presses the inner hole surface of a processed piece; operating the hammer drill to perform axial feeding slowly until the grinding sheet 4 reaches the cutting end position; closing the hammer drill, and slowly pulling the push-pull rod 1 out of an inner hole of a processed workpiece; and (4) detecting the size of the processed inner hole axial chute to ensure that the size is qualified.

Step three, the surface of the inner hole of the processed workpiece is processed again to obtain a design size so as to remove friction traces left on the surface of the inner hole when the grinding sheet 4 enters and exits the inner hole; and (5) detecting the size and the surface quality to ensure the qualification. The secondary machining enables the inner hole to obtain the designed size, and the inner hole can be roughly machined or finely machined.

The processing method of the inner hole axial chute can process the axial chute starting from any axial position without starting from one end of the inner hole, and can ensure the surface quality of the inner hole; one axial chute embodiment starting at any axial position is shown in fig. 6. The radial depth, the cross-sectional shape and the cross-sectional dimension of the inner bore axial chute are mainly determined by the structural dimension of the grinding sheet 4 at the outer side part; the starting position and the axial length of the inner bore axial chute are controlled by an operator.

Supplementary explanation: (1) during installation, the internal thread 31 of the screw sleeve 3 needs to be matched with the external thread of the rear clamping section 12, and the front end face of the end cover 21 is pressed tightly, so that the axial fastening of the rubber spring 2 is realized; it is also necessary that the through groove 32 of the insert 3 is circumferentially aligned with the rear portion of the guide groove 15 to receive the rear lug of the abrasive sheet 4. Therefore, the relative position of the screw sleeve 3 and the rear clamping section 12 of the push-pull rod 1 is ensured and cannot be loosened; to avoid loosening, thread compound is preferably used to prevent loosening.

(2) During installation, the rubber spring 2 and the threaded sleeve 3 are installed, the rear lug of the abrasive disc 4 is pressed into the through groove 32 of the threaded sleeve 3 in an inclined mode, then the abrasive disc 4 is pressed into the guide groove 15 of the push-pull rod 1, and the elastic body 42 of the abrasive disc 4 is enabled to be abutted against the bottom surface of the guide groove 15 on the inner side surface; finally, the sleeve 5 and the cone nut 6 are installed. During this mounting process, no positional interference occurs in the mounting of the grinding chip 4.

(3) By adopting the inner hole axial chute grinding device and the processing method, inner hole axial chutes which are uniformly distributed or symmetrically distributed along the circumferential direction are preferably processed; when processing the inner bore axial skewed slots which are non-uniformly or asymmetrically distributed along the circumferential direction, it is preferable to arrange the abrasive sheets 4 without the abrasive layer at symmetrical positions to improve the processing efficiency and precision and reduce the friction against the inner bore surface.

(4) The inner bore axial chute grinding device can adopt the prior art to change the square-handle four-pit structure of the push-pull rod 1 at the rear part of the handle section 11, is arranged on a drilling machine or a lathe, obtains rotary cutting motion, is used for grinding the surface of an inner bore, and improves the surface quality and the precision of the inner bore; the grinding machine can also be arranged on a broaching machine or a slotting machine, combines the motion control of the machine tool with the structure direction of the grinding sheet 4 and is used for grinding the inner hole variable cross-section grooves with various complex structures.

The invention has the following beneficial effects: (1) the push-pull rod 1 is provided with a square-handle four-pit structure at the rear part of the handle section 11, can be installed on a portable hammer drill, can finish a plurality of inner hole axial chutes in one step in an outdoor construction site, and ensures the relative position precision of the inner hole axial chutes. The inner hole axial groove processing in the prior art adopts broaching, slotting, stamping, linear cutting and other special processing methods, and a special machine tool, a die and a cutting tool are needed to process in a workshop of a factory; the method has the advantages that the method does not have workshop equipment conditions on an outdoor construction site, the processing of the inner hole axial groove is limited, and corresponding technical difficulties exist. Therefore, compared with the existing inner hole axial groove processing technology, the inner hole axial chute grinding device can be arranged on a portable hammer drill, a plurality of inner hole axial chutes can be processed and finished at one time in an outdoor construction site, the relative position precision of the inner hole axial chutes is ensured, the limitation that the outdoor construction site does not have workshop equipment conditions is avoided, the corresponding technical difficulty is solved, and the application range of the inner hole axial chute is enlarged.

(2) The base sheet 41 of the abrasive sheet 4 of the present invention covers the abrasive material layer on the outer side and the outer side portions of the left and right side faces; the outer side surface of the substrate 41 is closer to the axis of the push-pull rod 1 than the rear end at the front end, is inclined relative to the axis of the push-pull rod 1, abuts against and extrudes the inner hole surface of the workpiece to be machined under the elastic force action of the elastic body 42, generates axial reciprocating cutting motion under the driving of the guide groove 15 of the push-pull rod 1, and performs grinding processing on the inner hole surface of the workpiece to be machined to obtain an axial inclined groove. The elastic body 42 of the grinding sheet 4 wraps the inner side surface, the inner side parts of the left side surface and the right side surface, the front lug and the rear lug of the substrate 41, and the inner side surface is abutted against the bottom surface of the guide groove 15, so that large elastic deformation can be generated along the radial direction, the grinding sheet 4 generates the radial feeding motion of grinding processing, and the radial feeding motion continuously abuts against and extrudes the inner hole surface of a processed piece. The elastic body 42 is wrapped with a wire 44 at an inner portion, has a smaller thickness at the inner portion than at the outer portion, and has axially corrugated shapes at left and right side surfaces of the inner portion; the steel wire 44 is elastic, one end of the steel wire is inserted into the blind hole 43 of the substrate 41, the position of the steel wire is kept opposite to the substrate 41, the part exposed out of the blind hole 43 is wrapped by the inner side part of the elastic body 42, the elastic force of the elastic body 42 on the inner side part is enhanced, and the radial feeding power of the grinding sheet 4 in the grinding process is improved, so that the grinding efficiency is improved.

The existing inner hole variable cross-section groove machining technology needs to independently control axial cutting motion and radial feeding motion, and designs a special machine tool and a special cutter, such as the technical scheme provided by the invention patent with the application number of 201310271562.5. Therefore, compared with the prior art for processing the inner hole variable cross section groove, the inner hole axial inclined groove grinding device of the invention can utilize the radial pressing action of the substrate 41 and the surface of the inner hole to cause the elastic body 42 to elastically deform in the radial direction, so that the grinding plate 4 obtains the radial feeding motion of grinding processing without independent control. The inner hole axial chute grinding device only needs axial feed motion and axial reciprocating cutting motion, and can be driven by a portable hammer drill without a special machine tool with a complex control function, so that the driving device is greatly simplified, and the control complexity and the cost are reduced. In addition, because the portable hammer drill is adopted for driving, a complex special clamp is not needed, the complex clamping process is avoided, the limitation of the direction and the position of the inner hole is effectively avoided, and the convenience and the processing efficiency of the processing of the axial chute of the inner hole are greatly improved.

(3) At the beginning of machining, the radial pressing action of the base sheet 41 of the grinding sheet 4 of the invention on the inner hole surface mainly depends on the elastic force of the elastic body 42 in the radial direction, and is independent of the driving force of the axial reciprocating cutting motion; the front end face of the rubber spring 2 can be abutted against the surface of a processed workpiece around an inner hole, elastic deformation is generated under the impact action of the hammer drill, the buffer can be realized, the processed workpiece is prevented from being damaged, the push-pull rod 1 can also generate axial vibration to drive the grinding disc 4 to generate axial reciprocating vibration and cutting motion, the axial vibration energy is effectively recycled, and the grinding processing efficiency is improved. The grinding device can be used for processing fragile and fragile materials and hard materials and can be used for processing inner hole axial chutes of through holes or blind holes.

In the prior art, the inner hole surface processing of brittle and fragile materials and hard materials is limited, for example, the wire cutting cannot be used for processing the axial groove of a blind hole, and the hard materials are difficult to process by broaching, slotting and milling. Therefore, compared with the prior art, the invention fully utilizes the elastic deformation of the rubber spring 2 and the axial vibration caused by the elastic deformation to drive the grinding sheet 4 to generate axial vibration and cutting motion, thereby effectively recycling the vibration energy, improving the grinding efficiency, reducing the heat productivity and avoiding the energy waste; the method can also be used for processing fragile and fragile materials and hard materials, and the application range of the inner hole axial chute is expanded.

(4) The base sheet 41 of the grinding chip 4 of the present invention is pressed against the inner hole surface of the work piece by the elastic force of the elastic body 42, and the grinding process is performed on the inner hole surface of the work piece. Therefore, the grinding device can be directly arranged on a hammer drill or an electric drill to obtain rotary cutting motion, can be used for grinding the surface of an inner hole, improves the surface quality and precision of the inner hole, and can be adaptive to different inner hole diameters; the structure of the square handle four pits of the push-pull rod 1 at the rear part of the handle section 11 can also be changed by adopting the prior art, the push-pull rod is arranged on a broaching machine or a slotting machine, the motion control of a machine tool is combined with the structure direction of the grinding sheet 4, and the push-pull rod can be used for grinding inner hole variable cross-section grooves with various complex structures. The inner hole axial chute grinding device can be adaptive to different inner hole diameters, and is wide in application range.

(5) The processing method can process the inner hole axial chute starting at any axial position without starting at one end of the inner hole by adopting the grinding device, solves the technical problem that the inner hole surface can be damaged when the grinding sheet 4 enters and exits the inner hole because the radial feeding of the grinding sheet 4 can not be independently controlled, can effectively remove the friction trace left on the inner hole surface when the grinding sheet 4 enters and exits the inner hole, can ensure the surface quality of the inner hole, and avoids damaging the inner hole surface.

Drawings

FIG. 1 is a schematic structural view of an embodiment of an axial chute of an inner bore, in which a broken-line circle is drawn to show a partial view in the direction of an arrow;

FIG. 2 is a schematic view showing the overall construction of the grinding apparatus of the present invention;

fig. 3 is a left side view of the threaded sleeve 3 in the position of fig. 2;

FIG. 4 is a cross-sectional view of the refiner plate 4 shown at A-A in FIG. 2;

fig. 5 is a bottom view of the refiner plate 4 in the position of fig. 2;

FIG. 6 is a schematic view of an embodiment of an axial tapered slot of the inner bore starting at any axial position, with a broken line circle drawn in the figure to show a partial cross-sectional view B-B.

Description of reference numerals: the device comprises a push-pull rod 1, a handle section 11, a rear clamping section 12, a guide section 13, a front clamping section 14, a guide groove 15, a rubber spring 2, an end cover 21, a thread insert 3, an internal thread 31, a through groove 32, an abrasive disc 4, a substrate 41, an elastic body 42, a blind hole 43, a steel wire 44, a sleeve 5 and a conical nut 6.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Fig. 2 is a schematic diagram of the general structure of the grinding device of the present invention, which comprises a push-pull rod 1, a rubber spring 2, a threaded sleeve 3, a grinding plate 4, a sleeve 5 and a cone nut 6, and the four inner bore axial inclined slots shown in fig. 1 can be processed at one time. FIG. 1 is a schematic structural diagram of an embodiment of an axial inclined groove of an inner bore, which includes four axial inclined grooves uniformly distributed along the circumferential direction of a through hole.

The push-pull rod 1 is a circular stepped rod and comprises a handle section 11, a rear clamping section 12, a guide section 13 and a front clamping section 14, wherein the axes of the handle section 11, the rear clamping section 12, the guide section 13 and the front clamping section 14 are overlapped, and the guide groove 15 is formed in the front clamping section. The handle section 11 is of a cylindrical structure, and a square handle four-pit structure is arranged at the rear part. The rear clamping section 12 is of a cylindrical structure and is provided with an external thread; the guide section 13 is of a cylindrical structure; the front clamping section 14 is of a cylindrical structure and is provided with an external thread; the guide slot 15 is axially located at the rear of the front clamping section 14 and at the front of the rear clamping section 12, and axially penetrates through the guide section 13. The push-pull rod 1 and the structural characteristics thereof are preferably formed by forging and cutting medium carbon steel bars.

The rubber spring 2 is provided with an end cover 21 at the rear end; the end cover 21 is provided with an axial through hole in the center and an annular metal disc on the rear end face; the rubber spring 2 can be selected from known rubber spring commodities.

Fig. 3 is a left side view of the threaded sleeve 3 in the position of fig. 2; the thread insert 3 is a circular sleeve, and an internal thread 31 and a through groove 32 are formed in the inner surface; the through grooves 32 of the thread insert 3 axially penetrate through the thread insert 3 and correspond to the guide grooves 15 one by one. The sleeve 5 is a circular sleeve, and an axial groove is formed in the inner surface of the sleeve; the axial grooves of the sleeve 5 axially penetrate through the sleeve 5 and correspond to the guide grooves 15 one by one. The thread insert 3, the sleeve 5 and the structural characteristics are preferably formed by forging and cutting medium carbon steel bar stock.

Fig. 4 is a cross-sectional view of the grinding chip 4 shown at a-a in fig. 2, and fig. 5 is a bottom view of the grinding chip 4 at the position of fig. 2. The grinding sheet 4 is an elongated sheet-like structure with front lugs at the front end and rear lugs at the rear end, and comprises a base sheet 41 and an elastic body 42. The substrate 41 is a strip-shaped sheet structure with a front lug at the front end and a rear lug at the rear end, and is preferably formed by cutting a medium carbon steel plate. The substrate 41 is covered with an abrasive layer on the outer side and the outer side portions of the left and right side surfaces; the abrasive is preferably diamond, corundum, silicon carbide or the like, which is known, and is formed as an abrasive layer covering the outer side of the substrate 41 by a known consolidation or coating process.

The grinding plate 4 has a blind hole 43 on the inner side surface of the base plate 41, and a plurality of steel wires 44 are inserted and fixed in the blind hole 43. The blind hole 43 is preferably drilled by a drilling machine. The wire 44 is provided with a spring, preferably a spring steel wire profile as is known. The elastic body 42 is fixedly connected with the substrate 41 at the outer side part, wraps the inner side surface, the inner side parts of the left side surface and the right side surface, the front lug and the rear lug of the substrate 41, wraps the steel wire 44 at the inner side part, has a thickness smaller than that at the outer side part at the inner side part, and presents an axial corrugation shape at the left side surface and the right side surface of the inner side part, as shown in fig. 5, and preferably, the known synthetic rubber is processed and formed by a mould pressing and vulcanizing process.

The conical nut 6 is of a truncated cone-shaped structure with an axial through hole in the center and an internal thread on the inner surface of the through hole, preferably a standard known conical nut.

FIG. 6 is a schematic view of an embodiment of an axial tapered slot of the inner bore starting at any axial position, with a broken line circle drawn in the figure to show a partial cross-sectional view B-B. The embodiment of the inner bore axial inclined groove begins from any axial position and can be processed by the processing method and the grinding device. For the embodiment of fig. 6, the size and surface quality of the inner bore obtained after the rough machining in the first step or the re-machining in the third step may be the same or different between the left part and the right part of the inner bore axial chute, and the machining process of the inner bore axial chute is not affected.

The above embodiments are merely preferred embodiments of the present invention, and are not to be construed as limiting the present invention. It is within the scope of the present invention to modify the materials and fabrication processes while still meeting the structural and performance requirements of the present invention.

Claims

1. The utility model provides a grinding device of processing hole axial chute, contains push-and-pull rod (1), rubber spring (2), swivel nut (3), abrasive disc (4), sleeve (5) and cone nut (6), its characterized in that: the device can be installed on a hammer drill, can process a plurality of inner hole axial chutes at one time in an outdoor construction site, can be used for processing fragile materials and hard materials, and can be adaptive to different inner hole diameters;

the push-pull rod (1) is a circular stepped rod and comprises a handle section (11), a rear clamping section (12), a guide section (13) and a front clamping section (14), and the push-pull rod is provided with an axial guide groove (15) which is used for accommodating the grinding sheet (4) and providing a guide and driving effect for the axial cutting motion and the radial feeding motion of the grinding sheet (4);

the rubber spring (2) is of a cylindrical structure, an end cover (21) is arranged at the rear end of the rubber spring, a rear clamping section (12) of the push-pull rod (1) penetrates through the rubber spring, axial positioning is achieved, the front end face of the rubber spring can be abutted against the surface of a workpiece to be machined to generate elastic deformation and buffer, the rubber spring can also drive the grinding disc 4 to generate axial vibration and cutting motion, axial vibration energy is recycled, and grinding efficiency is improved;

the screw sleeve (3) is a circular sleeve, an internal thread (31) and a through groove (32) are formed in the inner surface of the screw sleeve, the screw sleeve is matched with the rear clamping section (12) through the internal thread (31), the front end face of the end cover (21) can be pressed, and the axial fastening of the rubber spring (2) is realized;

the grinding disc (4) is of a long strip-shaped sheet structure, the front end of the grinding disc is provided with a front lug, the rear end of the grinding disc is provided with a rear lug, the grinding disc comprises a substrate (41) and an elastic body (42), the outer side part of the substrate (41) is covered with an abrasive layer, the inner hole surface of a workpiece to be machined is pressed and abutted by the abrasive layer to carry out grinding machining, the inner side part of the substrate (41) is covered with the elastic body (42), and the elastic body (42) is abutted against the side surface and the bottom surface of the guide groove (15) to be sealed and elastically deformed to generate radial feeding movement of the grinding machining, so that the grinding disc can be self-adapted to different;

the front lug of the grinding sheet (4) extends into the sleeve (5), and the rear lug of the grinding sheet (4) extends into the threaded sleeve (3), so that the grinding sheet (4) is prevented from falling off;

the sleeve (5) is a circular sleeve, an axial groove is formed in the inner surface of the sleeve, a front clamping section (14) of the push-pull rod (1) penetrates through the sleeve, and axial positioning is achieved;

the cone nut (6) is provided with an axial through hole and an internal thread, and the internal thread is matched with the front clamping section (14), so that the front end face of the sleeve (5) can be pressed, and the axial fastening of the sleeve (5) is realized.

2. A grinding apparatus for processing an inner bore axial chute as defined in claim 1 wherein: the handle section (11) is of a cylindrical structure, and a square handle four-pit structure is arranged at the rear part of the handle section to be connected with a hammer drill;

the rear clamping section (12) is of a cylindrical structure, is fixedly connected with the handle section (11) at the rear end, is smaller than the handle section (11) in diameter, and forms an annular step surface at the front end of the handle section (11);

the rear clamping section (12) is provided with an external thread and is matched with the threaded sleeve (3) through the external thread to realize the axial fastening of the rubber spring (2);

the guide section (13) is of a cylindrical structure, is fixedly connected with the rear clamping section (12) at the rear end, and has a diameter smaller than that of the rear clamping section (12);

the front clamping section (14) is of a cylindrical structure, is fixedly connected with the guide section (13) at the rear end, is smaller than the guide section (13) in diameter, and forms an annular step surface at the front end of the guide section (13);

the front clamping section (14) is provided with an external thread and is matched with the conical nut (6) through the external thread to realize the axial fastening of the sleeve (5);

the guide groove (15) is axially arranged, the front end of the guide groove is positioned at the rear part of the front clamping section (14), the rear end of the guide groove is positioned at the front part of the rear clamping section (12), and the guide groove axially penetrates through the guide section (13).

3. A grinding apparatus for processing an inner bore axial chute as defined in claim 1 wherein: the center of the end cover (21) is provided with an axial through hole, and the through hole penetrates into the rear clamping section (12) of the push-pull rod (1);

the end cover (21) is provided with a circular metal disc on the rear end face, and the metal disc is abutted against the step face at the front end of the handle section (11), so that the axial positioning of the rubber spring (2) is realized, the axial vibration and the cutting action of the grinding disc (4) are enhanced, and the grinding efficiency is improved.

4. A grinding apparatus for processing an inner bore axial chute as defined in claim 1 wherein: the through grooves (32) of the thread inserts (3) axially penetrate through the thread inserts (3), correspond to the guide grooves (15) one by one, are the same as the width of the guide grooves (15), are aligned with the rear parts of the guide grooves (15) in the circumferential direction, and accommodate the rear lugs of the grinding discs (4) so as to limit the radial feeding motion range of the grinding discs (4);

the axial grooves of the sleeve (5) axially penetrate through the sleeve (5), correspond to the guide grooves (15) one by one, are the same as the width of the guide grooves (15), are aligned with the front parts of the guide grooves (15) in the circumferential direction, and can accommodate front lugs of the grinding discs (4) so as to limit the radial feeding motion range of the grinding discs (4).

5. A grinding apparatus for processing an inner bore axial chute as defined in claim 1 wherein: the grinding plate (4) is provided with a blind hole (43) on the inner side surface of the substrate (41), and a plurality of steel wires (44) are inserted and fixed in the blind hole (43);

the substrate (41) is of a strip-shaped sheet structure, the front end of the substrate is provided with a front lug, and the rear end of the substrate is provided with a rear lug;

the substrate (41) is covered with an abrasive layer on the outer side and the outer side of the left and right sides; the outer side surface inclines relative to the axis of the push-pull rod (1), and is abutted against and extrudes the surface of an inner hole of a processed workpiece under the action of elastic force of the elastic body (42);

the elastic body (42) is fixedly connected with the substrate (41) at the outer side part and wraps the inner side surface, the inner side parts of the left side surface and the right side surface, the front lug and the rear lug of the substrate (41), so that the abrasive disc (4) is abutted against and relatively moves with the side surface of the guide groove (15) through the elastic body (42) to realize sealing;

the elastic body (42) wraps the steel wire (44) at the inner side part, the thickness of the inner side part is smaller than that of the outer side part, the left side surface and the right side surface of the inner side part are in an axial corrugated shape, the inner side surface is abutted against the bottom surface of the guide groove (15), elastic deformation can be generated along the radial direction, so that the grinding sheet (4) is continuously abutted against and extrudes the surface of an inner hole of a machined workpiece, and different inner hole diameters can be self-adapted;

the steel wire (44) has elasticity, and the elastic force of the elastic body (42) on the inner side part is enhanced, so that the grinding efficiency is improved.

6. A method for processing an inner bore axial chute by using the grinding device of claim 1, wherein the method comprises the following steps: the method can process the inner bore axial chute starting from any axial position and ensure the surface quality of the inner bore, and comprises the following steps:

firstly, roughly machining an inner hole on a machined workpiece, and reserving machining allowance;

step two, installing the push-pull rod (1) on a hammer drill, and plugging the push-pull rod (1) into an inner hole of a machined workpiece to enable the grinding sheet (4) to reach a cutting starting position;

the hammer drill is started, the push-pull rod (1) is driven to generate axial reciprocating push-pull motion, and the grinding disc 4 is driven to generate axial reciprocating cutting motion; operating the hammer drill to perform axial feeding until the grinding sheet (4) reaches a cutting end position; closing the hammer drill, and pulling the push-pull rod (1) out of the inner hole of the processed workpiece;

detecting the size of the processed inner hole axial chute;

thirdly, machining the surface of the inner hole of the machined workpiece again to obtain a design size so as to remove friction traces left on the surface of the inner hole by the grinding sheet (4); and (6) detecting.