CN216138118U

CN216138118U - Expanding cutter

Info

Publication number: CN216138118U
Application number: CN202122113010.4U
Authority: CN
Inventors: 和西录; 夏元满; 安瑶瑶
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-03-29
Anticipated expiration: 2031-09-02

Abstract

The utility model discloses a cutter expanding tool, which comprises a tool body, an adjusting mechanism and a blade mechanism, wherein the tool body is respectively provided with a first mounting hole and a second mounting hole along the axial direction and the radial direction; the adjusting mechanism comprises an elastic component and an ejector rod component, two ends of the elastic component are respectively connected with the cutter body and the ejector rod component, and the ejector rod component is slidably arranged in the first mounting hole; blade mechanism includes voussoir and blade subassembly, the voussoir is located in the second mounting hole, the one end of voussoir with the blade subassembly is connected or the butt, the other end of voussoir be formed with the wedge face of ejector pin subassembly butt. The cutter expanding tool disclosed by the utility model is stable in cutter expanding, cutting fluid cannot enter the cutter to corrode the cutter, and the cutter has long service life.

Description

Expanding cutter

Technical Field

The utility model relates to the technical field of inner hole machining, in particular to a cutter expanding tool.

Background

The engine cylinder hole is used as an energy conversion chamber for the engine to complete fuel compression, combustion and explosive work, the diameter of the engine cylinder hole is related to the volume of the engine combustion chamber, and the engine cylinder hole is an important index for measuring the compression ratio of the engine. The pneumatic expanding cutter is a processing mode for ensuring the diameter of a cylinder hole, an air passage is arranged in the pneumatic expanding cutter and communicated with a compressed air source, and the processing diameter of the cutter is controlled by controlling the pressure of the air source. In the process of machining a cylinder hole by adopting the pneumatic expanding cutter, the air source pressure of a machining tool often cannot reach a required value, so that the cutter is not expanded or the expanding cutter is incomplete, and the expanding cutter is very unstable.

Therefore, it is necessary to provide a new expanding knife tool to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a knife expanding tool, and aims to solve the technical problem that the existing pneumatic knife expanding tool is unstable in knife expanding.

In order to achieve the purpose, the expanding cutter tool provided by the utility model comprises a cutter body, an adjusting mechanism and a blade mechanism, wherein the cutter body is respectively provided with a first mounting hole and a second mounting hole along the axial direction and the radial direction of the cutter body; the adjusting mechanism comprises an elastic component and an ejector rod component, two ends of the elastic component are respectively connected with the cutter body and the ejector rod component, and the ejector rod component is slidably arranged in the first mounting hole; blade mechanism includes voussoir and blade subassembly, the voussoir is located in the second mounting hole, the one end of voussoir with the blade subassembly is connected or the butt, the other end of voussoir be formed with the wedge face of ejector pin subassembly butt.

Optionally, the ejector rod assembly comprises an ejector rod and an adjusting piece, a connecting piece is further arranged at one end, far away from the elastic assembly, of the cutter body, the adjusting piece is connected with the cutter body through the connecting piece, one end of the adjusting piece penetrates through the connecting piece and extends into the first mounting hole, the adjusting piece can move along the axial direction of the first mounting hole, one end of the ejector rod is connected with the elastic assembly, and the other end of the ejector rod is abutted to one end, extending into the first mounting hole, of the adjusting piece.

Optionally, the knife expanding tool further comprises a tool shank, the tool shank is connected with the tool body, a mounting cavity is formed between the tool body and the tool shank, the mounting cavity is communicated with the first mounting hole, and the elastic assembly is accommodated in the mounting cavity.

Optionally, the ejector rod comprises a first section, a second section and a third section, outer walls of the first section and the third section are abutted to an inner wall of the first mounting hole, and the diameter of the second section is smaller than that of the first section and the third section.

Optionally, a lubrication groove is formed in the outer wall of the first section and/or the third section.

Optionally, the blade assembly includes a tool holder and an insert mounted on the tool holder, the insert is mounted at one end of the tool holder close to the wedge, the tool body is provided with an insert accommodating groove communicated with the second mounting hole, and the tool holder is mounted in the insert accommodating groove through a fastener.

Optionally, an arc-shaped protrusion is arranged on one side of the tool holder close to the wedge block, and one side of the wedge block far away from the wedge-shaped surface abuts against the arc-shaped protrusion.

Optionally, the wedge-shaped surface comprises a first side and a second side which are oppositely arranged, wherein the second side is arranged near the elastic component, and the wedge-shaped surface inclines from the first side to the second side in a direction near the blade assembly.

Optionally, the elastic assembly comprises a plurality of pistons and elastic members, the pistons are connected with the ram assemblies, and the plurality of elastic members are mounted on the pistons.

Optionally, the piston is an aluminum piston.

In the utility model, the stroke of the ejector rod assembly in the first mounting hole can be adjusted by adjusting the compression degree of the elastic assembly, when the ejector rod assembly moves, the wedge block can be pushed to move in the second mounting hole through the connection between the wedge surfaces, and the wedge block is connected with or abutted against the blade assembly, so that the radial movement of the blade assembly in the cutter body can be controlled, and the required processing diameter of the cylinder hole is realized. Because the elasticity that the spring unit provided can not change along with the change of external factor, consequently add the very stable structure of whole sword cutter that rises of man-hour to the unstable problem of sword that has solved. In addition, the expanding cutter is realized by adopting a pure mechanical structure, an internal gas circuit of the existing pneumatic expanding cutter is omitted, and the sealing property inside the cutter is increased, so that the phenomenon that the cutting fluid enters the cutter to cause the internal device to be corroded is avoided, and the service life of the cutter is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of a disassembled three-dimensional structure of an embodiment of a knife expanding tool of the present invention;

FIG. 2 is a schematic view of a partial cross-sectional structure of an embodiment of the expanding cutter tool of the present invention;

FIG. 3 is a schematic structural diagram of a lift pin according to an embodiment of the present invention;

fig. 4 is a partially enlarged schematic structural view of an embodiment of the expanding cutter tool of the present invention.

Examples reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Knife body	220	Ejector rod assembly
200	Adjusting mechanism	221	Top rod
				300	Blade mechanism	2211	First stage
400	Knife handle	2212	Second section
				110	First mounting hole	2213	Third stage
120	Second mounting hole	2214	Lubrication groove
				130	Connecting piece	222	Adjusting part
131	Flange plate	310	Wedge block
				132	Gasket	311	Wedge-shaped surface
140	Mounting cavity	320	Blade assembly
				150	Knife placing groove	321	Tool holder
210	Spring assembly	3211	Arc-shaped bulge
				211	Piston	322	Blade
212	Elastic piece	323	Fastening piece
				213	Bolt

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a cutter expanding tool.

Referring to fig. 1 and 2, the present invention provides an expanding cutter tool, including a cutter body 100, an adjusting mechanism 200, and a blade mechanism 300, wherein the cutter body 100 is formed with a first mounting hole 110 and a second mounting hole 120 along an axial direction and a radial direction thereof, respectively; the adjusting mechanism 200 comprises an elastic component 210 and a push rod component 220, two ends of the elastic component 210 are respectively connected with the cutter body 100 and the push rod component 220, and the push rod component 220 is slidably mounted in the first mounting hole 110; the blade mechanism 300 includes a wedge 310 and a blade assembly 320, the wedge 310 is located in the second mounting hole 120, one end of the wedge 310 is connected or abutted with the blade assembly 320, and the other end of the wedge 310 is formed with a wedge surface 311 abutted with the ejector pin assembly 220.

The elastic member 210 may be a spring, a rubber member, or the like, for providing a pushing force to the movement of the push rod assembly 220. The elastic member 210 is always in a compressed state, and when the compression amount of the elastic member 210 is changed, the elastic force generated by the elastic deformation of the elastic member is changed, so as to drive the push rod assembly 220 to move and finally change the position where the push rod assembly stays in the first mounting hole 110. When the position of the top bar assembly 220 is changed, the contact position between the wedge surface 311 and the top bar assembly 220 is also changed, so that the wedge 310 can move in the second mounting hole 120 and drive the blade assembly 320 connected or abutted with the wedge 310 to move along the radial direction of the cutter body 100. During machining, the cutter expanding tool rotates around the main shaft of the cutter body 100, and the blade assembly 320 cuts the wall of the cylinder hole, so that when the radial position of the blade assembly 320 in the cutter body 100 is changed, the machining diameter is changed, and the function of the conventional pneumatic cutter expanding tool is realized. In this embodiment, the wedge 310 abuts the blade assembly 320, and in other embodiments, a flexible connection may be used to prevent the wedge 310 from interfering with the second mounting hole 120. The utility model provides the variable cutter expanding force for the cutter expanding through the elastic component 210, changes the radial position of the blade component 320 through the wedge mechanism, has stable structure, ensures the processing precision, and eliminates the problems of halt, cutter clamping, cutter collision and the like caused by the instability of the cutter expanding. Meanwhile, a pressure relief hole in the existing pneumatic expanding cutter is omitted, so that the cutter caused by the fact that cutting fluid enters the inside of the cutter is prevented from rusting, the service life of the cutter is prolonged, and the processing cost is saved.

Further, the top rod assembly 220 includes a top rod 221 and an adjusting member 222, a connecting member 130 is further disposed at one end of the cutter body 100 far away from the elastic assembly 210, the adjusting member 222 is connected to the cutter body 100 through the connecting member 130, one end of the adjusting member 222 penetrates through the connecting member 130 and extends into the first mounting hole 110, the adjusting member 222 can move along the axial direction of the first mounting hole 110, one end of the top rod 221 is connected to the elastic assembly 210, and the other end of the top rod 221 abuts against one end of the adjusting member 222 extending into the first mounting hole 110. The connecting member 130 is detachably mounted on the outer portion of the end of the cutter body 100 away from the elastic member 210, and the connecting member 130 has a through hole (not shown) in the center thereof through which the adjusting member 222 passes until one end abuts against the lift pin 221. The adjusting member 222 is detachably connected to the connecting member 130 and can adjust its position in the through hole. In this embodiment, the connecting member 130 includes a flange 131 and a spacer 132, and the adjusting member 222 is a bolt having a through hole and a screw thread, and the bolt is screwed with the connecting member 130. When the bolt is screwed in, pushing the top rod 221 to move towards the elastic component 210, the wedge block 310 retracts, and meanwhile, the elastic component 210 is compressed, and the interaction between the limitation of the bolt on the top rod 221 and the elastic force generated by the elastic component 210 enables the top rod 221 to be stably kept at the existing position, so that the expansion knife is kept stable. In other embodiments, the adjustment member 222 and the connector 130 can be snap-fit, such as a few snap-fit slots with a plurality of consecutive teeth, such that the adjustment member 222 can be secured in different positions.

Furthermore, the expanding cutter further comprises a cutter handle 400, the cutter handle 400 is connected with the cutter body 100, the cutter body 100 and the cutter handle 400 jointly form a mounting cavity 140, the mounting cavity 140 is communicated with the first mounting hole 110, and the elastic component 210 is accommodated in the mounting cavity 140. The elastic component 210 and the top rod 221 can be integrally arranged, and can also be detachably connected, such as clamping connection, threaded connection and the like. In addition, in the present embodiment, the inner diameter of the mounting cavity 140 is larger than the inner diameter of the first mounting hole 110, and the elastic member 210 can abut against a step surface formed between the two, so that the stroke of the top rod 221 can be limited, and the wedge 310 is prevented from being out of contact with the top rod 221 due to an excessively large movement stroke of the top rod 221. In addition, the end of the shank 400 remote from the tool body 100 is connected to a machine tool, so that the expanding tool is mounted on the machine tool.

The top rod 221 comprises a first section 2211, a second section 2212 and a third section 2213, the outer walls of the first section 2211 and the third section 2213 are abutted to the inner wall of the first mounting hole 110, and the diameter of the second section 2212 is smaller than the diameters of the first section 2211 and the third section 2213. In this embodiment, the first segment 2211 is close to the adjusting member 222, the third segment 2213 is close to the elastic member 210, and the second segment 2212 is located between the first segment 2211 and the third segment 2213. During cutting, radial cutting forces are transmitted to the lift pins 221 through the blade assembly 320 and the wedge 310, and shear stresses are induced on the lift pins 221, which may cause the lift pins 221 to shear. The outer walls of the first segment 2211 and the third segment 2213 are abutted to the first mounting hole 110, so that the cutter body 100 can support the ejector rod 221 to a certain extent, the shear stress on the ejector rod 221 can be effectively reduced, and the structural strength is enhanced. When the top rod 221 moves in the axial direction, a very large friction force is generated between the outer walls of the first and

third sections

2211 and 2213 and the inner wall of the first mounting hole 110, so that the movement of the top rod 221 is blocked and damage is caused to the surface of the part. By reducing the diameter of the second segment 2212, lubricating oil can be injected into the cavity formed between the second segment 2212 and the first mounting hole 110, reducing the friction force when the jack 221 moves, and also reducing the weight of the jack 221. In this embodiment, the shaft shoulders formed between the second segment 2212 and the first and

third segments

2211 and 2213 are all shaft shoulders with rounded corners, which can reduce stress concentration and increase the strength of the top rod 221.

Further, the outer walls of the first segment 2211 and/or the third segment 2213 are provided with lubricating grooves 2214, so that lubricating oil can be more uniformly distributed on the contact surface of the first mounting hole 110 and the mandril 221. The lubrication groove 2214 may be an axial lubrication groove or a circumferential lubrication groove. In this embodiment, the outer walls of the first segment 2211 and the third segment 2213 are respectively provided with a plurality of intersecting axial lubrication grooves and a plurality of circumferential lubrication grooves, wherein the plurality of axial lubrication grooves are respectively communicated with the cavity formed between the second segment 2212 and the first mounting hole 110, so that more lubricating oil can flow into the lubrication grooves, and the lubrication effect is improved.

The blade assembly 320 includes a holder 321 and an insert 322 mounted on the holder 321, the insert 322 is mounted on one end of the holder near the wedge 310, the cutter body 100 is provided with an insert placing groove 150 communicated with the second mounting hole 120, and the holder 321 is mounted in the insert placing groove 150 by a fastener 323. The end of the holder 321 remote from the insert 322 is mounted in the pocket 150, and the fastener 323 may be a bolt, a cylindrical pin, or the like. In this embodiment, the fastening member 323 is a bolt, the head of which is mounted on the inner wall of the tool receiving slot 150, and the tail of which is threadedly coupled to the tool holder 321. The opening direction of the tool holding groove 150 faces to the side far away from the top rod 221, and when the tool is installed, a bolt is installed first, and then the tool holder 321 provided with the blade 322 is connected with the bolt. In addition, the tool holder 321 has a spherical groove (not shown) into which the tail of the bolt can extend, so that the tool receiving slot 150 can accommodate more tool holders 321 of different lengths. At the same time, the spherical groove also increases the flexibility of the tool holder 321. Therefore, when the wedge 310 is pushed out, the tool holder 321 can rotate around the connection part of the wedge 310 and the fastener 323 is arranged far away from the wedge 310, so that the length of the force arm is increased, the resistance force applied when the wedge 310 is pushed out is reduced, and the labor is saved.

Further, an arc protrusion 3211 is disposed on a side of the holder 321 close to the wedge 310, and a side of the wedge 310 away from the wedge surface 311 abuts against the arc protrusion 3211. Because the cutter holder 321 has a certain rotation, the contact position of the wedge 310 and the cutter holder 321 can be changed, the arc-shaped bulge 3211 can ensure that the wedge 310 and the cutter holder 321 are always abutted, and the structural stability is improved.

Wedge-face 311 includes oppositely disposed first side 3111 and second side 3112, wherein second side 3112 is disposed proximate resilient member 210, and wedge-face 311 is inclined from first side 3111 to second side 3112 in a direction proximate blade assembly 320. When the knife needs to be expanded, the adjusting member 222 is rotated to move the top rod 221 away from the elastic assembly 210, which is equivalent to releasing the elastic assembly 210, and the knife is relatively labor-saving under the pushing of the spring assembly 210 to the reaction force of the adjusting member 222. Accordingly, when the blade assembly 320 needs to be retracted, the elastic assembly 210 needs to be compressed, which is relatively laborious, and can effectively prevent the blade assembly 320 from being pushed back under the action of cutting force, thereby ensuring the stability of the expanding knife.

The elastic member 210 includes a plurality of pistons 211 and elastic members 212, the pistons 211 are connected to the ram assembly 220, and the plurality of elastic members 212 are mounted on the pistons 211 to enhance the compressive strength of the elastic member 210. The elastic member 212 may be a spring, a rubber member, or the like. In this embodiment, the elastic member 212 is a spring, and a plurality of springs are uniformly installed on the piston 211 and detachably connected to the piston, so as to facilitate replacement. Wherein the piston 211 is mounted on the top rod 221 by a bolt 213. A groove (not shown) is formed in the piston 211, a part of the top rod 221 is received in the groove, a bolt 213 penetrates the piston 211 from the other side of the groove and is in threaded connection with the top rod 221, and the head of the bolt 213 abuts against the piston 211. The end of the top rod 221 also has a protrusion (not shown) for limiting the relative rotation of the piston 211, preventing the piston 211 from rotating and loosening the bolt 213. In other embodiments, the piston 211 and the top rod 221 may be detachably connected by other means, such as a pin connection.

Further, the piston 211 is an aluminum piston. When the aluminum contacts with the air, a layer of compact aluminum oxide film is generated on the surface, so that the aluminum can be prevented from being corroded, and the service life of the cutter is prolonged. Meanwhile, the aluminum has lighter weight, and the weight of the cutter can be reduced. In other embodiments, the piston 211 may be made of a corrosion resistant material such as chrome plated steel.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A knife expanding tool is characterized by comprising:

the cutter body is provided with a first mounting hole and a second mounting hole along the axial direction and the radial direction of the cutter body respectively;

the adjusting mechanism comprises an elastic component and a mandril component, two ends of the elastic component are respectively connected with the cutter body and the mandril component, and the mandril component is slidably arranged in the first mounting hole;

blade mechanism, blade mechanism includes voussoir and blade subassembly, the voussoir is located in the second mounting hole, the one end of voussoir with blade subassembly is connected or the butt, the other end of voussoir be formed with the wedge face of ejector pin subassembly butt.

2. The expanding cutter tool of claim 1, wherein the ejector rod assembly comprises an ejector rod and an adjusting member, a connecting member is further disposed at an end of the cutter body away from the elastic assembly, the adjusting member is connected to the cutter body through the connecting member, one end of the adjusting member extends into the first mounting hole through the connecting member, the adjusting member is capable of moving in the axial direction of the first mounting hole, one end of the ejector rod is connected to the elastic assembly, and the other end of the ejector rod abuts against an end of the adjusting member extending into the first mounting hole.

3. The expanding cutter tool as claimed in claim 2, further comprising a shank, wherein the shank is connected to the cutter body, the cutter body and the shank together form a mounting cavity, the mounting cavity is communicated with the first mounting hole, and the elastic assembly is accommodated in the mounting cavity.

4. The expanding cutter tool of claim 2, wherein the ejector rod comprises a first section, a second section and a third section, the outer walls of the first section and the third section are abutted against the inner wall of the first mounting hole, and the diameter of the second section is smaller than that of the first section and the third section.

5. The expanding cutter tool defined in claim 4, wherein the outer wall of the first section and/or the third section is provided with a lubrication groove.

6. The expanding tool bit of any one of claims 1-5, wherein the blade assembly comprises a holder and an insert mounted on the holder, the insert is mounted on one end of the holder near the wedge, the tool body is provided with a tool holding groove communicated with the second mounting hole, and the holder is mounted in the tool holding groove by a fastener.

7. The expanding tool bit of claim 6, wherein the holder has an arcuate projection on a side thereof adjacent to the wedge, and wherein the wedge abuts the arcuate projection on a side thereof remote from the wedge surface.

8. The expanding knife tool of any one of claims 1-5, wherein the wedge surface comprises a first side and a second side which are oppositely arranged, wherein the second side is arranged near the elastic component, and the wedge surface is inclined from the first side to the second side to the direction near the blade component.

9. The expanding knife tool of any one of claims 1-5, wherein the elastic assembly comprises a plurality of pistons and elastic members, the pistons are connected with the ram assemblies, and the elastic members are mounted on the pistons.

10. The expanding knife tool of claim 9, wherein the piston is an aluminum piston.