阅读说明：本技术 一种汽车手动变速箱选档控制块及制备方法 (Gear selection control block of automobile manual transmission and preparation method ) 是由 钱夏晨 夏敏 张艳伟 石小荣 周涛 于 2021-08-16 设计创作，主要内容包括：本发明提供一种汽车手动变速箱选档控制块及制备方法,包括主体,所述主体外周面的一侧凸出有选挡凸起,选挡凸起的外表面开设有选档波形槽,所述选档凸起的一端端面为第一端面,另一端端面为第二端面,主体外周面上位于第一端面的所在端开设有第一退刀槽,且第一端面为第一退刀槽的槽壁,所述主体外周面上位于第二端面的所在端开设有第二退刀槽,且第二端面为第二退刀槽的槽壁。本发明提供的一种汽车手动变速箱选档控制块及制备方法,通过选档波形槽两侧设置第一退刀槽和第二退刀槽,有效的减小零件切削余量,减少毛坯重量,降低零件原料成本；同时零件选档波形槽加工方案改为成形铣刀加工,极大的提高零件的加工效率,提高选档波形槽的加工精度。(The invention provides a gear selection control block of an automobile manual transmission and a preparation method thereof, wherein the gear selection control block comprises a main body, a gear selection bulge protrudes from one side of the outer peripheral surface of the main body, a gear selection corrugated groove is formed in the outer surface of the gear selection bulge, one end surface of the gear selection bulge is a first end surface, the other end surface of the gear selection bulge is a second end surface, a first tool withdrawal groove is formed in the end, located on the first end surface, of the outer peripheral surface of the main body, the first end surface is the groove wall of the first tool withdrawal groove, a second tool withdrawal groove is formed in the end, located on the second end surface, of the outer peripheral surface of the main body, and the second end surface is the groove wall of the second tool withdrawal groove. According to the gear selection control block and the preparation method of the manual transmission of the automobile, the first tool withdrawal groove and the second tool withdrawal groove are arranged on the two sides of the gear selection corrugated groove, so that the cutting allowance of parts is effectively reduced, the weight of blanks is reduced, and the raw material cost of the parts is reduced; meanwhile, the machining scheme of the gear selection wave-shaped groove of the part is changed into the machining of a forming milling cutter, so that the machining efficiency of the part is greatly improved, and the machining precision of the gear selection wave-shaped groove is improved.)

1. The utility model provides a car manual transmission gear selection control block which characterized in that: the gear selecting corrugated groove (1) is formed in the outer surface of the gear selecting protrusion, one end face of the gear selecting protrusion is a first end face (103), the other end face of the gear selecting protrusion is a second end face (104), a first tool withdrawal groove (101) is formed in the end, located on the first end face (103), of the outer peripheral face of the main body, the first end face (103) is a groove wall of the first tool withdrawal groove (101), a second tool withdrawal groove (102) is formed in the end, located on the second end face (104), of the outer peripheral face of the main body, and the second end face (104) is a groove wall of the second tool withdrawal groove (102).

2. The manual transmission gear selection control block of an automobile according to claim 1, characterized in that: the novel tool is characterized in that a boss (2) and a U-shaped positioning block (7) are oppositely arranged on the outer peripheral surface of the main body, the boss (2) is arranged on one side close to the first tool withdrawal groove (101), the U-shaped positioning block (7) is arranged on one side close to the second tool withdrawal groove (102), the boss (2) and the U-shaped positioning block (7) can be divided into two symmetrical parts through a certain plane of the axis of the main body, the plane is an equipartition plane, the included angle between the first end surface (103) and the equipartition plane is alpha, and the included angle between the second end surface (104) and the equipartition plane is beta.

3. The gear selection control block of a manual transmission for a vehicle according to claim 2, wherein: neither alpha nor beta is greater than 64 deg..

4. The gear selection control block of a manual transmission for a vehicle according to claim 2, wherein: the main part is equipped with centre bore (4) along the axial, be equipped with pinhole (3) with centre bore (4) intercommunication on boss (2), be equipped with on U-shaped locating piece (7) the diapire screw hole (6) with centre bore (4) intercommunication, pinhole (3) and screw hole (6) coaxial setting.

5. The gear selection control block of a manual transmission for a vehicle according to claim 2, wherein: the outer peripheral surface of the main body is further provided with an M-shaped shifting groove (5), and the M-shaped shifting groove (5) is opposite to the gear selecting protrusion.

6. The gear selection control block of a manual transmission for a vehicle according to claim 5, wherein: the surface of the gear selection control block is provided with a wear-resistant layer, and the thickness of the wear-resistant layer is 0.2-1.8 mm.

7. The gear selection control block of a manual transmission for a vehicle according to claim 5, wherein: the density of the gear selection control block is more than or equal to 6.8g/cm³。

8. A method for manufacturing a manual transmission gear selection control block for an automobile according to any one of claims 1 to 7, wherein:

the preparation steps are as follows:

a. putting the raw materials of the gear selecting control block into a forming die, wherein the raw materials of the product comprise the following components in percentage by weight: carbon: 0-0.3%, copper: 1.5-3.9%, cutting aid: 0.1-0.4%, the rest is iron;

b. make itSintering by using a mesh belt type sintering furnace, wherein the sintering temperature is as follows: 1120 ℃ ± 20 ℃, degreasing temperature: 650 ℃ -800 ℃, nitrogen flow: 57 +/-3 m³/h；

c. Machining a gear selection wave-shaped groove (1), a pin hole (3) and a threaded hole (6) by using a machining center, wherein the gear selection wave-shaped groove (1) is machined by a profiling cutter (8) matched with the gear selection wave-shaped groove in shape;

d. carrying out vacuum carburizing heat treatment on the gear selection control block by using a vacuum carburizing furnace: vacuum heating temperature: 850 ℃. + -. 20 ℃ and time: 30 min; carburizing temperature: 850 ℃. + -. 20 ℃ and time: 120 min; atmosphere gas: acetylene, diffusion temperature: 850 ℃. + -. 20 ℃ and time: 5 min; quenching heat preservation temperature: 850 ℃. + -. 20 ℃ and time: 30 min; quenching temperature: 850 ℃, oil temperature 60 ℃ +/-20 ℃, time: 1 min; tempering temperature: 180 ℃ ± 20 ℃, time: 180 min;

e. and (5) vibrating and grinding to remove burrs on the surface of the part, and then cleaning and detecting.

Technical Field

The invention relates to the technical field of powder metallurgy, in particular to a gear selection control block of an automobile manual transmission and a preparation method thereof.

Background

As shown in fig. 1, in the prior art, the shift selection control block includes a main body, a shift selection corrugated groove 1 is provided on a side wall of the main body, a boss 2 is provided on one side of the shift selection corrugated groove 1 along a circumferential direction of the main body, a U-shaped positioning block 7 is provided on the other side, and two sides of the shift selection corrugated groove 1 are smoothly transited with the boss 2 and the U-shaped positioning block 7, respectively.

The gear-selecting wave-shaped groove of the gear-selecting control block can only be milled by using the ball cutter one by one, so that the part processing cost is high, the processing speed is low, and the gear-selecting wave-shaped groove is not suitable for mass production. Moreover, a hardened layer of a product produced by the existing production process of the gear-selecting control block is difficult to control, a thin-wall part is easy to quench through, the toughness of the product is reduced, and the brittle fracture of a part is easy to cause during frequent gear shifting, so that the use function cannot be met.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects that the processing speed of the gear selection control block is low, the production cost is high, and the depth of a surface hardening layer is difficult to control, so that the toughness of a product is reduced, the invention provides the gear selection control block of the manual transmission of the automobile and a preparation method thereof.

The technical scheme adopted for solving the technical problems is as follows: a gear selecting control block of an automobile manual transmission and a preparation method thereof comprise a main body, wherein a gear selecting bulge protrudes from one side of the outer peripheral surface of the main body, a gear selecting wave-shaped groove is formed in the outer surface of the gear selecting bulge, one end face of the gear selecting bulge is a first end face, the other end face of the gear selecting bulge is a second end face, a first tool withdrawal groove is formed in the end, located on the first end face, of the outer peripheral surface of the main body, the first end face is the groove wall of the first tool withdrawal groove, a second tool withdrawal groove is formed in the end, located on the second end face, of the outer peripheral surface of the main body, and the second end face is the groove wall of the second tool withdrawal groove.

When the part is formed, a first tool withdrawal groove and a second tool withdrawal groove are formed on two sides of the gear selection bulge, and then the gear selection corrugated groove is machined on the gear selection bulge through a forming milling cutter. The cutting allowance of parts is effectively reduced, the weight of blanks is reduced, and the raw material cost of the parts is reduced; meanwhile, the machining scheme of the gear selection wave-shaped groove of the part is formed by a forming milling cutter, so that the machining efficiency of the part is greatly improved, and the machining precision of the gear selection wave-shaped groove is improved.

Further, a boss and a U-shaped positioning block are oppositely arranged on the outer peripheral surface of the main body, the boss is arranged on one side close to the first tool withdrawal groove, the U-shaped positioning block is arranged on one side close to the second tool withdrawal groove, the boss and the U-shaped positioning block can be divided into two mutually symmetrical parts through a certain plane of the axis of the main body, the plane is an equipartition plane, the included angle between the first end surface and the equipartition plane is alpha, and the included angle between the second end surface and the equipartition plane is beta.

Further, in order to ensure that the gear selection wave-shaped groove works normally in the using process, alpha and beta are not more than 64 degrees.

Furthermore, the main body is provided with a central hole along the axial direction, the boss is provided with a pin hole communicated with the central hole, the bottom wall of the U-shaped positioning block is provided with a threaded hole communicated with the central hole, and the pin hole and the threaded hole are coaxially arranged. The threaded hole is connected with the pin hole through a pin and used for limiting the assembling shaft.

Furthermore, an M-shaped shifting groove is further formed in the outer peripheral surface of the main body, and the M-shaped shifting groove and the gear selecting protrusion are arranged oppositely.

Furthermore, in order to meet the use requirement of the gear selection control block in the frequent gear shifting process and ensure that the gear selection control block is not easy to wear, a wear-resistant layer is arranged on the surface of the gear selection control block, and the thickness of the wear-resistant layer is 0.2-1.8 mm. The uniformity of the surface hardening layer can be realized by using vacuum carburizing heat treatment, and the requirement of 0.2-1.8mm of the thickness of the wear-resistant layer is met.

Furthermore, the density of the gear selection control block is more than or equal to 6.8g/cm³。

The invention also provides a preparation method of the gear selection control block of the manual transmission of the automobile, which comprises the following steps:

a. putting the raw materials of the gear selecting control block into a forming die, wherein the raw materials of the product comprise the following components in percentage by weight: carbon: 0-0.3%, copper: 1.5-3.9%, cutting aid: 0.1-0.4%, the rest is iron;

b. sintering by using a mesh belt type sintering furnace, wherein the sintering temperature is as follows: 1120 ℃ ± 20 ℃, degreasing temperature: 650 ℃ -800 ℃, nitrogen flow: 57 +/-3 m³/h；

c. Machining a gear selection wave-shaped groove, a pin hole and a threaded hole by using a machining center, wherein the gear selection wave-shaped groove is machined by a profiling cutter matched with the gear selection wave-shaped groove in shape;

d. carrying out vacuum carburizing heat treatment on the gear selection control block by using a vacuum carburizing furnace: vacuum heating temperature: 850 ℃. + -. 20 ℃ and time: 30 min; carburizing temperature: 850 ℃. + -. 20 ℃ and time: 120 min; atmosphere gas: acetylene, diffusion temperature: 850 ℃. + -. 20 ℃ and time: 5 min; quenching heat preservation temperature: 850 ℃. + -. 20 ℃ and time: 30 min; quenching temperature: 850 +/-20 ℃, oil temperature of 60 +/-20 ℃, and time: 1 min; tempering temperature: 180 ℃ ± 20 ℃, time: 180 min;

e. and (5) vibrating and grinding to remove burrs, and then cleaning and detecting.

The invention has the beneficial effects that: according to the gear selection control block of the manual transmission of the automobile and the preparation method thereof, the vacuum quenching process is adopted, so that the depth of a hardened layer of a part can be uniformly maintained between 0.2 and 1.8mm, the wear resistance and the shock resistance of the part are improved, and the use requirement is met; the first tool withdrawal groove and the second tool withdrawal groove are arranged on the two sides of the gear selection corrugated groove, so that the cutting allowance of parts is effectively reduced, the weight of blanks is reduced, and the raw material cost of the parts is reduced; meanwhile, the machining scheme of the gear selection wave-shaped groove of the part is changed into the machining of a forming milling cutter, so that the machining efficiency of the part is greatly improved, and the machining precision of the gear selection wave-shaped groove is improved.

Drawings

The invention is further illustrated by the following figures and examples.

FIG. 1 is a schematic diagram of a prior art gear selection control block;

FIG. 2 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 4 is a schematic view of the profile tool in machining a gear-selecting wave-shaped groove.

In the figure: 1. the gear selection corrugated groove comprises a gear selection corrugated groove body 101, a first tool withdrawal groove body 102, a second tool withdrawal groove body 103, a first end face 104, a second end face 2, a boss 3, a pin hole 4, a central hole 5, an M-shaped gear shifting groove 6, a threaded hole 7, a U-shaped positioning block 8 and a profiling cutter.

Detailed Description

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

As shown in fig. 1 to 4, the shift control block for a manual transmission of an automobile and a manufacturing method thereof according to the present invention includes a main body, a shift protrusion protrudes from one side of an outer peripheral surface of the main body, a shift waveform groove 1 is formed on an outer surface of the shift protrusion, an end surface of the shift protrusion is a first end surface 103, an end surface of the other end surface is a second end surface 104, a first relief groove 101 is formed at an end of the outer peripheral surface of the main body, which is located on the first end surface 103, the first end surface 103 is a groove wall of the first relief groove 101, a second relief groove 102 is formed at an end of the outer peripheral surface of the main body, which is located on the second end surface 104, and the second end surface 104 is a groove wall of the second relief groove 102.

The outer peripheral surface of the main body is oppositely provided with a boss 2 and a U-shaped positioning block 7, the boss 2 is arranged on one side close to the first tool withdrawal groove 101, the U-shaped positioning block 7 is arranged on one side close to the second tool withdrawal groove 102, the boss 2 and the U-shaped positioning block 7 can be divided into two symmetrical parts through one surface of the main body axis, the surface is an equally divided surface, the included angle between the first end surface 103 and the equally divided surface is alpha, the included angle between the second end surface 104 and the equally divided surface is beta, and both alpha and beta are not more than 64 degrees.

The main part is equipped with centre bore 4 along the axial, be equipped with the pinhole 3 with centre bore 4 intercommunication on the boss 2, be equipped with the screw hole 6 with centre bore 4 intercommunication on the 7 diapalls of U-shaped locating piece, pinhole 3 and screw hole 6 coaxial setting.

The outer peripheral surface of the main body is further provided with an M-shaped gear shifting groove 5, and the M-shaped gear shifting groove 5 is opposite to the gear selecting protrusion.

The surface of the gear selection control block is provided with a wear-resistant layer, and the thickness of the wear-resistant layer is 0.2-1.8 mm.

The density of the gear selection control block is more than or equal to 6.8g/cm³。

The preparation steps are as follows:

a. putting the raw materials of the gear selecting control block into a forming die, wherein the raw materials of the product comprise the following components in percentage by weight: carbon: 0-0.3%, copper: 1.5-3.9%, cutting aid: 0.1-0.4%, the rest is iron;

b. sintering by using a mesh belt type sintering furnace, wherein the sintering temperature is as follows: 1120 ℃ ± 20 ℃, degreasing temperature: 650 ℃ -800 ℃, nitrogen flow: 57 +/-3 m³/h；

c. When a part is formed, a first tool withdrawal groove 101 and a second tool withdrawal groove 102 are formed on two sides of a gear selection bulge, then a gear selection corrugated groove 1 is machined on the gear selection bulge through a profiling cutter 8, and the surface roughness of the gear selection corrugated groove 1 is less than or equal to Rz6.3; and (3) drilling the pin hole 3 and the bottom diameter hole of the threaded hole 6 by adopting a customized nonstandard step drill, and then machining the threaded hole 6 by adopting a nonstandard screw tap.

d. Carrying out vacuum carburizing heat treatment on the gear selection control block by using a vacuum carburizing furnace: vacuum heating temperature: 850 ℃. + -. 20 ℃ and time: 30 min; carburizing temperature: 850 ℃. + -. 20 ℃ and time: 120 min; atmosphere gas: acetylene, diffusion temperature: 850 ℃. + -. 20 ℃ and time: 5 min; quenching heat preservation temperature: 850 ℃. + -. 20 ℃ and time: 30 min; quenching temperature: 850 +/-20 ℃, oil temperature of 60 +/-20 ℃, and time: 1 min; tempering temperature: 180 ℃ ± 20 ℃, time: 180 min;

e. and (5) vibrating and grinding to remove burrs, and then cleaning and detecting.

Directions and references (e.g., up, down, left, right, etc.) may be used in the present disclosure only to aid in the description of features in the figures. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.