CN211939323U

CN211939323U - Floating connection cutter bar and reamer thereof

Info

Publication number: CN211939323U
Application number: CN202020451539.XU
Authority: CN
Inventors: 付强; 赵廷强; 陈自平
Original assignee: Chengdu Qiping Technology Co ltd
Current assignee: Chengdu Qiping Technology Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-11-17
Anticipated expiration: 2030-03-31

Abstract

The utility model discloses a floating connection cutter bar and a reamer thereof, belonging to the technical field of cutting processing; the floating connection cutter bar comprises a cutter bar main body and a floating mechanism; the cutter bar main body is provided with a mounting cavity at one end along the axis direction, and a mounting hole penetrating through the cutter bar main body in the radial direction is formed in the cutter bar main body at the section of the mounting cavity; the floating mechanism comprises a connecting part which is arranged in the mounting cavity and is in clearance fit with the mounting cavity and a mounting part which is positioned outside the mounting cavity and is used for mounting the cutter head; the connecting part is radially provided with a connecting hole penetrating through the connecting part; the cutter bar main body is connected with the floating mechanism through a connecting shaft penetrating through the mounting hole and the connecting hole, and the connecting shaft is in close fit with the mounting hole and is in clearance fit with the connecting hole. This scheme passes through mutually supporting of cutter arbor main part and relocation mechanism, and when the cutter arbor was not the collineation with the axis of being processed the bottom outlet, the axis of the automatic adjustment relocation mechanism that floats that can pass through relocation mechanism to make its and the axis collineation of being processed the bottom outlet, realize feeding smoothly and move back the sword.

Description

Floating connection cutter bar and reamer thereof

Technical Field

The utility model relates to a cutter in the cutting process, concretely relates to connection cutter arbor and reamer float.

Background

In a traditional machine tool machining tool system, a cutting tool is divided into a cutter handle system and a cutter, the cutter handle system is a connecting part for connecting with a machine tool, and the axis of the cutter handle system is fixed and cannot be adjusted in a self-adaptive manner according to a machining environment; when processing, the cutter handle system drives the cutter to realize the processing of the processed product.

At present, when reaming and repairing holes, a reaming cutter, a boring cutter and a reamer are mainly adopted to process the holes so as to ensure the processing precision; because when reaming and repairing the hole, the bottom hole is formed, when the cutter with a rigid structure is used for machining the bottom hole, if the positioning precision of the machined product is not high, the axis of the rigid cutter and the axis of the bottom hole to be subjected to finish machining are not located on the same axis, the cutter is machined in a forced inlet hole, the service life of the cutter can be influenced, the precision of the machined product is poor, and the machined product is even scrapped, so that the cost of the machining raw materials is increased.

SUMMERY OF THE UTILITY MODEL

Not enough to the above-mentioned among the prior art, the utility model provides a unsteady connection cutter arbor and reamer thereof has solved the problem that the cutter arbor axis is not adjustable among the prior art.

In order to achieve the purpose of the invention, the utility model adopts the technical scheme that:

in a first aspect, a floating connection cutter bar is provided, which comprises a cutter bar main body and a floating mechanism;

the cutter bar main body is provided with a mounting cavity at one end along the axis direction, and a mounting hole penetrating through the cutter bar main body in the radial direction is formed in the cutter bar main body at the section of the mounting cavity;

the floating mechanism comprises a connecting part which is arranged in the mounting cavity and is in clearance fit with the mounting cavity and a mounting part which is positioned outside the mounting cavity and is used for mounting the cutter head; the connecting part is radially provided with a connecting hole penetrating through the connecting part;

the cutter bar main body is connected with the floating mechanism through a connecting shaft penetrating through the mounting hole and the connecting hole, and the connecting shaft is in close fit with the mounting hole and is in clearance fit with the connecting hole.

Furthermore, at least one ring of annular groove is formed in the circumferential surface of the connecting part, and a rubber ring with the outer surface contacting with the inner surface of the mounting cavity is mounted in the annular groove.

Furthermore, the connecting part is provided with a shaft hole at the side of the connecting hole far away from the mounting part, and the shaft hole is communicated with the connecting hole; a pull-back shaft which is in point contact with the connecting shaft when the cutter bar main body is pulled back is arranged in the shaft hole; the mounting groove has been seted up to the tip that connecting portion kept away from the installation department, installs the ball that the diameter is greater than the mounting groove degree of depth in the mounting groove.

In a second aspect, a reamer is provided, which comprises a cutter head and a floating connection cutter rod, wherein the cutter head is fixedly arranged on the mounting part through a connecting piece.

The utility model has the advantages that: according to the technical scheme, the cutter bar is designed into the cutter bar main body and the floating mechanism in clearance fit with the cutter bar main body, and the cutter bar main body and the floating mechanism are connected into a whole through the connecting shaft, so that the floating mechanism can be guaranteed to move in the axial direction and the radial direction relative to the cutter bar main body; after the cutter arbor sets up like this, when being processed bottom outlet and cutter arbor concentricity difference, can reach the adjustment of floating machanism and being processed the bottom outlet axis through the radial skew of floating machanism at the cutter arbor to guarantee the machining precision of being processed the bottom outlet.

After the tool bit enters the machined bottom hole, the rubber ring arranged in the scheme can limit the tool bit from deviating from a floating mechanism when a product is machined, so that the concentricity of the machined bottom hole and the tool bit is ensured, and the machining precision of the machined bottom hole is further improved; because the rubber circle is flexible material, it has elasticity, adds man-hour to being processed the bottom hole at the tool bit, can guarantee the stability of the cutter arbor axis after floating.

In addition, the rubber ring can separate the inside from the outside of the installation cavity, so that corrosive liquid can be prevented from entering the installation cavity to corrode parts in the installation cavity during processing; meanwhile, impurities generated during processing can be isolated outside, so that the normal floating of the floating mechanism is ensured.

This scheme sets up the ball in the mounting groove after, for the point contact between relocation mechanism and the cutter arbor main part when the feed to reach and reduce frictional force, both relative motion is more smooth and easy, and when guaranteeing quick feed, relocation mechanism floats according to the axis by the processing bottom hole fast and adjusts, can also play the guard action to the tool bit when guaranteeing by the machining precision of processing the bottom hole.

When moving back the sword, the clearance between the floating mechanism and the cutter arbor main part is the point contact when making the back sword to the mutually supporting of pull-back axle and connecting axle, and both frictional force is very little when relative movement, resumes under the condition of deformation at the rubber circle, can the axis of quick adjustment cutter arbor, makes things convenient for next time to advance the sword.

Drawings

Fig. 1 is a partial schematic view of a tool bit mounted on a tool holder.

Fig. 2 is a partial cross-sectional view of the tool holder body.

Fig. 3 is an enlarged structural schematic diagram of the second inner hole of the floating mechanism after the ball is placed in the second inner hole.

Fig. 4 is a left side view of the structure shown in fig. 3.

Fig. 5 is a right side view of the structure shown in fig. 3.

Fig. 6 is an enlarged partial cross-sectional view of the second bore of the float mechanism with balls disposed therein.

Wherein, 1, the cutter bar main body; 11. a mounting cavity; 12. mounting holes; 13. a connecting shaft; 14. cushion blocks; 2. a floating mechanism; 21. a connecting portion; 211. connecting holes; 212. an annular groove; 213. a rubber ring; 214. a shaft hole; 215. pulling back the shaft; 216. mounting grooves; 217. a ball bearing; 22. an installation part; 221. a second inner bore; 3. a cutter head; 31. a connecting member; 32. a first inner bore; 33. and (5) steel balls.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art within the spirit and scope of the present invention as defined and defined by the appended claims.

As shown in fig. 1 to 6, the floating connection tool bar includes a tool bar body 1 and a floating mechanism 2, wherein the axes of the tool bar body 1 and the floating mechanism 2 are collinear when the tool bar is not in operation, and the axes of the floating mechanism 2 and the tool bar body 1 are parallel but not collinear when the floating mechanism floats relative to each other.

As shown in fig. 1 and 2, an installation cavity 11 is formed in the end portion of one side of the cutter bar main body 1 along the axial direction, and an installation hole 12 penetrating through the cutter bar main body 1 in the radial direction is formed in the cutter bar main body 1 at the section where the installation cavity 11 is located; wherein the axis of the mounting cavity 11 and the axis of the cutter bar main body 1 are positioned on the same straight line.

As shown in fig. 3 to 6, the floating mechanism 2 includes a connecting portion 21 installed in the mounting cavity 11 and in clearance fit with the mounting cavity 11, and a mounting portion 22 located outside the mounting cavity 11 and used for mounting the cutter head 3; the connecting part 21 is radially provided with a connecting hole 211 penetrating through the connecting part;

the cutter bar main body 1 and the floating mechanism 2 are connected through a connecting shaft 13 penetrating through the mounting hole 12 and the connecting hole 211, and the connecting shaft 13 is tightly matched with the mounting hole 12 and is in clearance fit with the connecting hole 211.

After this scheme provides's cutter arbor adopts above-mentioned structure, when tool bit 3 and the processing contact of product being processed, if the cutter arbor with by the axis of processing bottom hole during not the collineation, because the power of cutter arbor downstream can make relocation mechanism 2 take place certain skew to look for and by the 2 positions of the collinear relocation mechanism of processing bottom hole axis, when relocation mechanism 2 and by processing bottom hole axis collineation, realize the smooth tool feed.

In this embodiment, it is preferable that at least one annular groove 212 is formed on the circumferential surface of the connecting portion 21, and a rubber ring 213, the outer surface of which contacts the inner surface of the mounting cavity 11, is installed in the annular groove 212. It is further preferred that one of the annular grooves 212 is between the connecting shaft 13 and the mounting portion 22.

Due to the arrangement of the rubber ring 213, after the tool bit 3 enters the machined bottom hole, the rubber ring 213 arranged in the scheme can limit the floating mechanism 2 from deviating when the tool bit 3 is used for machining a product, so that the concentricity of the machined bottom hole and the tool bit 3 is ensured, and the machining precision of the machined bottom hole is further improved; because the rubber ring 213 is flexible, it has elasticity, and when the tool bit 3 was processed the bottom hole, can guarantee the stability of the cutter arbor axis after floating.

In an embodiment of the present invention, the connecting portion 21 is provided with a shaft hole 214 on the side of the connecting hole 211 away from the mounting portion 22, and the shaft hole 214 is communicated with the connecting hole 211; a pull-back shaft 215 which is in point contact with the connecting shaft 13 when the cutter bar body 1 is pulled back is arranged in the shaft hole 214; the end of the connecting portion 21 away from the mounting portion 22 is opened with a mounting groove 216, and a ball 217 (preferably, the ball 217 is a steel ball with greater rigidity) with a diameter larger than the depth of the mounting groove 216 is mounted in the mounting groove 216.

After the pull-back shaft 215 and the ball 217 in the mounting groove 216 are arranged, the working process of machining the hole to be machined (when the axis of the hole is not collinear with the axis of the cutter bar) with the cutter bar matched with the cutter head 3 and with low positioning accuracy is as follows:

when feeding, the cutter bar drives the cutter head 3 to move downwards and contact with a processed product, and because the cutter head 3 does not completely enter the processed bottom hole, the cutter bar has a barrier, the force generated when the cutter bar continues feeding can enable the ball 217 in the mounting groove 216 to form point contact with the cutter bar main body 1, and the cutter bar moves back and forth, so that the axis of the floating mechanism 2 deviates relative to the axis of the cutter bar main body 1, the movement of the ball 217 can enable the axis of the floating mechanism 2 to be collinear with the axis of the processed bottom hole at a certain moment, and at the moment, the cutter bar continues to move downwards, and finally the cutter head 3 smoothly enters the processed bottom hole.

When the cutter is withdrawn, the cutter bar drives the cutter head 3 to move upwards and separate from the processed product, the force for pulling back the cutter bar enables the connecting shaft 13 and the pull-back shaft 215 to form point contact, and then the force of the rubber ring 213 when the deformation is recovered can drive the floating mechanism 2 to relatively slide relative to the connecting shaft 13 so as to adjust the axis of the floating mechanism 2, gradually make the axis of the cutter bar main body 1 and the axis of the floating mechanism 2 collinear, and achieve the return of the floating mechanism 2 so as to facilitate the next cutter feeding.

Because installation cavity 11 is regular round hole, generally adopts drill bit or milling cutter processing to form, the interior bottom surface of installation cavity 11 that forms like this is the cambered surface, and the cambered surface stroke periodicity when can make the unsteady adjustment axis of floating machanism 2 changes, and causes the phenomenon that the sword jumps to appear in tool bit 3.

For the scheme, the preferable cutter bar main body 1 further comprises a cushion block 14, the cushion block 14 is installed at the end part of the installation cavity 11 (equivalent to the inner bottom surface of the installation cavity 11), and the cushion block 14 and the installation cavity 11 are in interference fit; the spacer 14 is in point contact with the ball 217 when the tool holder body 1 is advanced, and the rigidity of the spacer 14 is greater than that of the ball 217, and may be, for example, cemented carbide.

When a product is processed, because the processing resistance is high during feeding, if the hardness of the cushion block 14 is smaller than that of the ball 217, the ball 217 is easily pressed out of the concave pit, so that when the ball 217 slides back and forth relative to the cushion block 14, the stroke of the floating mechanism 2 is changed during floating adjustment; and the setting of this scheme cushion 14 hardness just can avoid appearing the condition of pit, and ball 217 is when sliding, and cushion 14 can not worn and torn under the frictional force effect simultaneously, and even if ball 217 has taken place wearing and tearing, still can not influence its relative cushion 14's slip.

After the product is processed, because the resistance is small when the product is pulled back (retracted), the acting force between the connecting shaft 13 and the pulling-back shaft 215 is also small, and the hardness requirement of the materials between the two parts is not high relatively, so long as the two parts are made of the materials with basically the same hardness.

If the cushion block 14 is not arranged in the mounting cavity 11, the tool bar body 1 can be made of hard alloy in order to ensure long-term use of the tool bar.

As shown in fig. 3 and 6, the connecting portion 21 is provided with two circles of annular grooves 212, and the two circles of annular grooves 212 are respectively located on the sides of the pull-back shaft 215 and the connecting shaft 13 away from each other. The arrangement of the two annular grooves 212 can ensure the axial stability of the whole floating mechanism 2 when the tool bit 3 processes products, and can further improve the quick return of the floating mechanism 2 when the tool bit retreats.

Referring again to fig. 1, the ball 217 in the mounting groove 216 is located at the center of the end face of the connecting portion 21, the connecting shaft 13 is perpendicular to the pull-back shaft 215, the connecting shaft 13 is perpendicular to the axis of the cutter bar body 1, and the length of the connecting shaft 13 in the cutter bar body 1 is equal to the diameter of the cutter bar body 1; the two ends of the connecting shaft 13 cannot extend out of the outer surface of the tool bar body 1, and the two ends of the pull-back shaft 215 cannot extend out of the outer surface of the floating mechanism 2.

After the connecting shaft 13, the balls 217 and the pull-back shaft 215 are arranged in the above manner, the balls 217 are always on the same axis with the whole floating mechanism 2 and the tool bit 3 when the axial force is transmitted, the axial force is reasonable, the axial force deflection is not easy to generate, and the quality of the processed hole is improved. The position of two point contacts of this scheme is on the axis of whole floating machanism 1 and tool bit 3 forever, and the axial atress is reasonable, is difficult to produce the axial atress and deflects to reduce the damage to the downthehole surface of processing when moving back the sword.

The arrangement of the structure of the cutter bar can ensure that the action point of the cutter bar is always positioned on the axis of the floating mechanism 2 when the cutter bar is fed and withdrawn, thus ensuring the stability of the stress on the two sides of the axis of the floating mechanism 2 and ensuring the floating of the floating mechanism 2 to be the translation of the axis.

The floating clearance between the connecting shaft 13 and the connecting part 21 is 0.05-0.2 mm, and the floating clearance between the connecting part 21 and the cutter bar main body 1 is 0.02-0.6 mm. The setting of the size of the clearance fit position in the cutter bar can ensure that the floating mechanism 2 can float in a small range, and meanwhile, the axial line of the cutter bar main body 1 and the axial line of the floating mechanism 2 can be prevented from offsetting too much, so that the cutter bar is influenced to realize the force transmission.

As shown in fig. 1, the present solution further provides a reamer, which comprises a cutter head 3 and a floating connection cutter bar 1, wherein the cutter head 3 is fixedly installed on the installation portion 22 through a connecting piece 31.

A first inner hole 32 is formed in the right center of the connecting surface of the cutter head 3, and a steel ball 33 with the diameter smaller than the depth of the first inner hole 32 is arranged in the first inner hole 32 in a tight fit mode; the right center of the side surface of the mounting part 22 connected with the cutter head 3 is provided with a second inner hole 221 which is provided with a conical surface and accommodates the steel ball 33 in the first inner hole 32.

Mutually supporting of tool bit 3 and cutter arbor can utilize steel ball 33 to realize that cutter arbor and 3 of tool bit's heart location are connected, can realize when repeatedly changing tool bit 3 that 3 of tool bits forever and cutter arbor are the heart, need not waste a lot of efforts and go to adjust repeatedly the heart location between the two and connect to can be with the control of beating of whole cutter within 0.003 mm.

The spherical steel ball 33 is used for realizing the centering positioning connection of the cutter rod and the cutter head 3, the positioning precision is higher, the cutter bounce is smaller, the operation is simple, the cost is low, and the cutter rod cannot be damaged when the cutter head 3 is replaced. Because the steel balls 33 are spherical, the spherical body has a good positioning advantage that the bearing surfaces of the steel balls 33 are uniform and do not deviate no matter which surface the cutter head 3 and the cutter bar are pressed from.

In conclusion, even if misalignment exists between the cutter bar and the hole to be machined, smooth feeding can be realized through the floating of the floating mechanism 2 after the cutter bar provided by the scheme is adopted; after the reamer of this scheme of adoption cutter arbor, its processing that not only can realize rather than having the processing of treating the machined hole of a small amount of deviations, quick centering when can also realizing tool bit 3 changes is fixed a position.

Claims

1. The floating connection cutter bar is characterized by comprising a cutter bar main body and a floating mechanism;

one end of the cutter bar main body is provided with an installation cavity along the axis direction, and the cutter bar main body at the section of the installation cavity is provided with an installation hole penetrating through the cutter bar main body in the radial direction;

the floating mechanism comprises a connecting part which is arranged in the mounting cavity and is in clearance fit with the mounting cavity, and a mounting part which is positioned outside the mounting cavity and is used for mounting a tool bit; the connecting part is radially provided with a connecting hole penetrating through the connecting part;

the cutter bar main body is connected with the floating mechanism through a connecting shaft penetrating through the mounting hole and the connecting hole, the connecting shaft is tightly matched with the mounting hole, and the connecting hole is in clearance fit.

2. The floating connection cutter bar as claimed in claim 1, wherein at least one ring of annular groove is formed on the circumferential surface of the connection part, and a rubber ring with an outer surface contacting with the inner surface of the installation cavity is installed in the annular groove.

3. The floating connection tool bar as claimed in claim 1 or 2, wherein the connecting portion is provided with a shaft hole at a side of the connecting hole away from the mounting portion, and the shaft hole is communicated with the connecting hole; a pull-back shaft which is in point contact with the connecting shaft when the cutter bar main body is pulled back is arranged in the shaft hole; the mounting groove has been seted up to the tip that connecting portion kept away from the installation department, install the ball that the diameter is greater than the mounting groove degree of depth in the mounting groove.

4. The floating connection tool bar as claimed in claim 3, wherein the tool bar body further comprises a cushion block, the cushion block is mounted at the end of the mounting cavity, and the cushion block and the mounting cavity are in interference fit; the cushion block is in point contact with the ball when the cutter bar main body feeds, and the rigidity of the cushion block is larger than that of the ball.

5. The floating connection tool bar as claimed in claim 3, wherein the connecting portion has two annular grooves formed thereon, and the two annular grooves are respectively located at sides of the pull-back shaft and the connecting shaft away from each other.

6. The floating connection tool bar as claimed in claim 3, wherein the ball in the mounting groove is located at the center of the end surface of the connection part, the connection shaft is perpendicular to the pull-back shaft, the connection shaft is perpendicular to the axis of the tool bar body, and the length of the connection shaft in the tool bar body is equal to the diameter of the tool bar body.

7. The floating connection tool bar as claimed in claim 1, wherein a floating gap between the connection shaft and the connection portion is 0.05-0.2 mm, and a floating gap between the connection portion and the tool bar body is 0.02-0.6 mm.

8. A reamer comprising a cutter head and the floating connection cutter bar of any one of claims 1 to 7, wherein the cutter head is fixedly mounted on the mounting portion through a connector.

9. The reamer of claim 8, wherein a first inner hole is formed in the right center of the connecting surface of the cutter head, and steel balls with the diameter smaller than the depth of the first inner hole are installed in the first inner hole in a tight fit manner; the right center position of the side surface of the mounting part connecting tool bit is provided with a second inner hole which is provided with a conical surface and contains a steel ball in the first inner hole.