CN113000874B

CN113000874B - PCD forming cutter for inner cavity groove of automobile part

Info

Publication number: CN113000874B
Application number: CN201911331953.5A
Authority: CN
Inventors: 朱均; 刘影; 刘梨华
Original assignee: Changzhou Yege Tools Co ltd
Current assignee: Changzhou Yege Tools Co ltd
Priority date: 2019-12-21
Filing date: 2019-12-21
Publication date: 2024-05-10
Anticipated expiration: 2039-12-21
Also published as: CN113000874A

Abstract

The invention provides an automobile part inner cavity groove PCD forming cutter, which comprises a cutter handle and a cutter bar, wherein a first cutter blade for forming a groove and a second cutter blade for forming an end chamfer are axially arranged on the cutter bar from the front end to the cutter handle, one end of the first cutter blade is embedded into the cutter bar, the cutting edge of the first cutter blade protrudes outwards from the cutter bar, the cutting edge comprises a groove bottom forming part, a side wall forming part and a wall transition forming part, the side wall forming part and the wall transition forming part are symmetrically arranged on two sides of the groove bottom forming part and are sequentially connected, and an included angle with alpha is formed between the wall transition forming part and the axis of the cutter bar; the second blade is provided with a chamfering edge, the chamfering edge is gradually far away from the cutter bar from the front end to the rear end, and an included angle with the axis of the cutter bar is formed. The problem that a customer is difficult to process the inner cavity groove of the automobile part is solved, the surface precision and quality of a product are improved, the processing efficiency is improved by one-step molding, the service life of a cutter is prolonged, and the production cost is reduced.

Description

PCD forming cutter for inner cavity groove of automobile part

Technical Field

The invention relates to the technical field of cutters, in particular to a PCD forming cutter for an inner cavity groove of an automobile part.

Background

With the improvement of the living standard of people, automobiles have been taken into thousands of households as a common transportation means. Therefore, it is particularly important to ensure the safety performance of the automobile during the use process.

The machining precision of each part of the automobile directly influences the quality of the automobile, so that the safety performance of the automobile is influenced, and potential safety hazards exist for drivers and passengers. Particularly, in the most important parts such as automobile engine systems, steering systems and the like, a large number of inner holes and inner cavity grooves are machined, and the port parts of the parts are also provided with chamfers,

The main functions are to increase the torque transmitted from the steering wheel to the steering gear and to change the direction of force transmission. The steering gear shell has more holes, different step surfaces and chamfers are arranged on the inner wall and the outer wall of the holes, as shown in fig. 1, the steering gear shell is a structure of a certain hole-shaped component, two concave rings A and B are arranged on the inner wall of the steering gear shell, chamfers are arranged at the bottom and the edge of each concave ring, a certain angle alpha is formed between the concave rings and the inner wall of the hole cavity in a connecting mode, and chamfers C are arranged at the hole opening and the angle beta. The inner wall and the outer wall of the existing processing mode are processed by different working procedures, different cutters are required to be replaced, and the front-rear coaxiality cannot be guaranteed to be completely consistent after the cutters are replaced, so that the coaxiality and other indexes of the inner hole concave ring and the outer wall step of the processed product cannot meet the processing requirements, and the product qualification rate is reduced; in addition, frequent tool replacement complicates the process and reduces machining efficiency.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: in order to overcome the defects in the prior art, the invention provides an automobile part inner cavity groove PCD forming cutter.

The technical scheme adopted for solving the technical problems is as follows: the PCD forming cutter for the inner cavity groove of the automobile part comprises a cutter handle and a cutter bar, wherein a first cutter blade for forming the groove and a second cutter blade for forming the end chamfer are axially arranged on the cutter bar from the front end to the cutter handle,

One end of the first blade is embedded into the cutter bar, the cutting edge of the first blade protrudes outwards from the cutter bar, the cutting edge comprises a groove bottom forming part, side wall forming parts and wall transition forming parts, the side wall forming parts and the wall transition forming parts are symmetrically arranged on two sides of the groove bottom forming part and are sequentially connected, the cross section of the cutting edge part formed by the side wall forming parts of the groove bottom forming part in a surrounding mode is rectangular, one end of the wall transition forming part is connected with the side wall forming part, the other end of the wall transition forming part extends outwards along the axial direction of the cutter bar, and an included angle with the size alpha is formed between the wall transition forming part and the axis of the cutter bar;

The second blade one end imbeds the cutter arbor inside, and the other end outwards stands out in the cutter arbor surface, forms a chamfer sword, chamfer sword is kept away from the cutter arbor from the front end to the rear end gradually, forms the contained angle that the size is beta with the cutter arbor axis between.

The more the number of the first blades is, the more grooves are formed at one time, so that the processing time is saved, and therefore, the number of the first blades of the PCD cutter can be set according to the requirement; in addition, the bottom of the cutting edge of the cutter is provided with an inclined plane with a certain inclination angle, so that on one hand, a good transition can be formed between the groove and the inner cavity wall surface, and on the other hand, the influence on the inner cavity wall surface which does not need to be processed can be avoided.

Further, in order to avoid that the edge of the inner cavity groove is too sharp and difficult to process, the cutting edge of the first blade further comprises a bottom chamfer forming part and a top chamfer forming part, wherein the bottom chamfer forming part is an outwards convex arc with the radius of R1, and is in transitional connection between the groove bottom forming part and the side wall forming part; the top chamfer forming part is a concave arc with the radius of R2 and is in transitional connection between the side wall forming part and the wall transitional forming part.

Specifically, the number of the first blades is at least two, each group is at least two, the blades of the same group are symmetrically distributed on the same circumference of the cutter bar along the radial direction, and the blades between the adjacent groups are axially arranged in a straight line along the cutter bar.

Preferably, the included angle α is in the range of 4 ° to 8 °.

Preferably, the included angle α is 5 °.

Preferably, the included angle β is in the range of 15 ° -25 °.

Preferably, the included angle β is 20 °.

Preferably, the first blade and the second blade are both made of PCD.

The beneficial effects of the invention are as follows: according to the PCD forming cutter for the inner cavity groove of the automobile part, german import brand elements six are selected as raw materials, and through careful design of the structure, the rigidity of the cutter is greatly improved by adopting a cutter handle integrated structure; the processing method is formed by precisely manufacturing German import equipment VOLLMER, so that the problem that a customer is difficult to process a groove in an inner cavity of an automobile part is solved, the surface precision and quality of a product processed by the customer are improved, the processing efficiency is improved by one-step molding, the service life of a cutter is prolonged, the production cost is reduced, and the advantage of the PCD molding cutter is highlighted.

Drawings

The invention is further described below with reference to the drawings and examples.

Fig. 1 is a schematic view of the structure of a hole-shaped work piece.

Fig. 2 is a schematic structural view of a preferred embodiment of the present invention.

Fig. 3 is an enlarged view at a in fig. 2.

Fig. 4 is a schematic view of the initial positions of the tool and the workpiece at the initial stage of processing.

Fig. 5 is a schematic view of the initial positions of the tool and the workpiece during processing.

Fig. 6 is a schematic view of the initial positions of the machining completion tool and the workpiece.

In the figure: 1. the tool comprises a tool handle, 2, a tool bar, 3, a first blade, 31, a groove bottom forming part, 32, a bottom chamfer forming part, 33, a side wall forming part, 34, a top chamfer forming part, 35, a wall transition forming part, 4, a second blade, 41, a chamfer edge, 5, a cooling liquid channel, 6 and a drain groove.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.

For clarity, in this embodiment, the shank 2 side of the tool is the front end, and the shank 1 side is the rear end.

As shown in fig. 2 and 3, the PCD forming cutter for the inner cavity groove of the automobile part comprises a cutter handle 1 and a cutter rod 2, wherein a first cutter blade 3 for forming the groove and a second cutter blade 4 for forming the end chamfer are axially arranged on the cutter rod 2 from the front end to the cutter handle 1, and the first cutter blade 3 and the second cutter blade 4 are both made of PCD. The number of the first blades 3 is at least two, each group is at least two, the same group of blades are symmetrically distributed on the same circumference of the cutter bar 2 along the radial direction, and the blades between the adjacent groups are arranged in a straight line along the axial direction of the cutter bar 2. In this embodiment, the first blades 3 are two groups, each group being two. The outer diameter of revolution of the first blade 3 is ∅ mm and the tolerance is + -0.01 mm, the height H of the first blade 3 is 5.74mm and the tolerance is + -0.02 mm.

One end of the first blade 3 is embedded into the cutter bar 2, the cutting edge of the first blade 3 protrudes outwards from the cutter bar 2, the cutting edge comprises a groove bottom forming part 31, side wall forming parts 33 and wall transition forming parts 35 which are symmetrically arranged on two sides of the groove bottom forming part 31 and are sequentially connected, the cross section of a cutting edge part formed by the side wall forming parts 33 of the groove bottom forming part 31 is rectangular, one end of the wall transition forming part 35 is connected with the side wall forming part 33, the other end of the wall transition forming part extends outwards along the axial direction of the cutter bar 2, and an included angle with the axis of the cutter bar 2 is formed between the wall transition forming part 35 and the axis of the cutter bar 2; the preferred angle α is in the range of 4 ° -8 °, in this embodiment the angle α is 5 °. The distance between the first blades 3 is set according to the distance of the workpiece grooves.

One end of the second blade 4 is embedded into the cutter bar 2, the other end of the second blade protrudes outwards from the surface of the cutter bar 2 to form a chamfering blade 41, and the chamfering blade 41 is gradually far away from the cutter bar 2 from the front end to the rear end, and forms an included angle with the axis of the cutter bar 2, wherein the included angle is beta. The preferred angle beta is in the range of 15 deg. -25 deg., in this embodiment 20 deg., and the length L of the chamfer edge 41 is 3.0mm.

In order to avoid that the edges of the inner cavity grooves are too sharp and difficult to process, the cutting edge of the first blade 3 further comprises a bottom chamfer forming part 32 and a top chamfer forming part 34, wherein the bottom chamfer forming part 32 is an outwards convex arc with the radius of R1, and is in transitional connection between the groove bottom forming part 31 and the side wall forming part 33; the top chamfer forming portion 34 is a concave arc with a radius R2, and is transitionally connected between the side wall forming portion 33 and the wall transition forming portion 35. In this example, R1 was 0.4mm and R2 was 1mm.

In order to ensure the machining precision and the service life of the cutter, a cooling liquid channel 5 is arranged in the cutter bar 2, and a drain groove 6 is arranged on the surface of the cutter bar 2.

The cutter structure is suitable for processing inner cavity grooves, such as inner hole grooves, cylindrical surface grooves and the like, and the inner hole groove processing is taken as an example.

As shown in fig. 4, the cutter bar 2 of the PCD forming cutter is inserted into the inner hole of the workpiece, the inserted length is adjusted, the positions of the concave rings a and B are aligned, and the position of the chamfer C is adjusted. Then, as shown in fig. 5, since the concave rings a and B are deeper, the first blade 3 starts to process first. The tool is turned relative to the workpiece on the one hand and fed straight in the direction of the slot on the other hand, as shown in fig. 6, and the forming of the chamfer C is completed in the final second blade 4.

While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims

1. An automobile part inner cavity groove PCD shaping cutter which is characterized in that: the cutter comprises a cutter handle and a cutter bar, wherein a first cutter blade for forming a groove and a second cutter blade for forming an end chamfer are axially arranged on the cutter bar from the front end to the cutter handle, one end of the first cutter blade is embedded into the cutter bar, the cutting edge of the first cutter blade protrudes outwards from the cutter bar, the cutting edge comprises a groove bottom forming part, side wall forming parts and wall transition forming parts, the side wall forming parts and the wall transition forming parts are symmetrically arranged on two sides of the groove bottom forming part and are sequentially connected, the cross section of the cutting edge part surrounded by the side wall forming parts of the groove bottom forming part is rectangular, one end of the wall transition forming part is connected with the side wall forming part, the other end of the wall transition forming part extends outwards along the axial direction of the cutter bar, and an included angle with the size alpha is formed between the wall transition forming part and the axis of the cutter bar; one end of the second blade is embedded into the cutter bar, the other end of the second blade protrudes outwards from the surface of the cutter bar to form a chamfering blade, and the chamfering blade is gradually far away from the cutter bar from the front end to the rear end and forms an included angle with the axis of the cutter bar, wherein the included angle is beta;

The cutting edge of the first blade further comprises a bottom chamfer forming part and a top chamfer forming part, wherein the bottom chamfer forming part is an outwards convex arc with the radius of R1 and is in transitional connection between the groove bottom forming part and the side wall forming part; the top chamfer forming part is a concave arc with the radius of R2 and is in transitional connection between the side wall forming part and the wall surface transitional forming part;

the included angle alpha is in the range of 4-8 degrees;

the included angle beta ranges from 15 degrees to 25 degrees.

2. The automotive component cavity pocket PCD forming cutter of claim 1, wherein: the number of the first blades is at least two, each group is at least two, the blades of the same group are symmetrically distributed on the same circumference of the cutter bar along the radial direction, and the blades of the adjacent groups are arranged in a straight line along the axial direction of the cutter bar.

3. The automotive component cavity pocket PCD forming cutter of claim 1, wherein: the included angle α is 5 °.

4. The automotive component cavity pocket PCD forming cutter of claim 1, wherein: the included angle beta is 20 degrees.

5. The automotive component cavity pocket PCD forming cutter of claim 1, wherein: the first blade and the second blade are made of PCD.