Cross shaft processing device and processing method

Abstract

The present invention belongs to the field of cross-axis processing, and specifically relates to a cross-axis processing device and processing method. It includes a first mold unit, a second mold unit, a first push rod, and a second push rod. By setting a flash forming groove on the first mold unit, when the blank is extruded, part of the blank enters the flash forming groove, which increases the resistance encountered by the blank when it is extruded and deformed. When the blank is deformed from the first cavity to the second cavity, part of the blank enters the flash forming groove, resulting in a decrease in the speed of the blank entering the second cavity from the first cavity, so that the blank can fill the forming extrusion space at the extrusion part and the transition part, and then a qualified cross-axis can be processed. In this way, the problem that during the current processing of the cross-axis, the deformation speeds of various parts of the blank after being extruded in the mold are not completely consistent, resulting in the inability to completely fill the cavity of the mold, thereby resulting in unqualified products.

Description

Technical Field

[0001] The invention belongs to the field of cross shaft processing, and in particular relates to a cross shaft processing device and a processing method. Background Art

[0002] The cross shaft is the joint of the universal joint, which is a component that realizes variable-angle power transmission. It is used in the position where the direction of the transmission axis needs to be changed. It is the "joint" component of the universal transmission device of the automobile drive system. The most common way to process the cross shaft is hot working, which is to heat the blank and forge it to finally obtain the cross shaft of the required shape. However, hot working will cause the workers to work in a high-temperature environment for a long time, and long-term high-temperature work will cause harm to the workers' bodies. Therefore, processing the blank at room temperature is a cross shaft processing method accepted by more and more workers.

[0003] By placing the blank in a mold for extrusion molding, the blank can be processed into a cross shaft at room temperature. However, after the blank is extruded in the mold, the deformation space of the blank along the axial direction is small, resulting in a faster deformation speed of the blank in the axial space of the mold, so that the deformation speeds of various parts of the blank are not completely consistent, resulting in the cavity of the mold cannot be completely filled, resulting in unqualified products. Summary of the invention

[0004] In order to solve the problem that during the current processing of the cross shaft, the deformation speeds of various parts of the blank are not completely consistent after the blank is extruded in the mold, resulting in the cavity of the mold cannot be completely filled, thus causing unqualified products, the present invention provides a cross shaft processing device and a processing method.

[0005] In a first aspect, this embodiment provides a cross-axis processing device, comprising:

[0006] A first mold unit and a second mold unit; the first mold unit comprises a mold body, a first cavity, and four second cavities; the first cavity penetrates the mold body axially along the mold body; the second cavity is symmetrically recessed at the bottom of the mold body along the radial direction of the first cavity; one end of the second cavity is connected to the first cavity, and the other end is spaced from the outer peripheral surface of the mold body;

[0007] The second mold unit is located below the first mold unit, and the second mold unit and the first mold unit are arranged in a mirror-symmetrical manner;

[0008] Wherein, a flash molding groove is concavely provided at the bottom of the mold body of the first mold unit, and the flash molding groove is connected with the first mold cavity and the second mold cavity;

[0009] A first ejector pin and a second ejector pin, wherein the first ejector pin is movably disposed in the first cavity of the first mold unit; and the second ejector pin is movably disposed in the first cavity of the second mold unit;

[0010] The mold body is provided with a smooth portion, a transition portion, an extrusion portion, and a pressurizing portion; the extrusion portion is located at the inner periphery of the mold body, and the extrusion portion is located between two adjacent second cavities; the smooth portion and the transition portion are located at the mold body of the second cavity; the smooth portion is smoothly connected to the extrusion portion through the transition portion; the pressurizing portion is located at the bottom of the mold body, and the pressurizing portion is located at the side of the flash forming groove close to the extrusion portion;

[0011] The first cavity, the second cavity, and the flash forming groove of the first mold unit and the first cavity and the second cavity of the second mold unit together form an extrusion molding space. The first cavity of the first mold unit and the first cavity of the second mold unit together form a storage space, and the storage space is used to accommodate blanks.

[0012] In some embodiments, the width of the flash forming groove is 0.15 to 0.3 times the diameter of the cross shaft.

[0013] In some embodiments, the flash forming groove has a depth of 0.7 to 1 mm.

[0014] In some embodiments, the pressurizing portion protrudes along a radial direction of the first cavity and approaches the extrusion portion.

[0015] In some embodiments, the pressurizing portion is recessed away from the extrusion portion along a radial direction of the first cavity.

[0016] In some embodiments, the flash forming groove runs through the outer circumference of the mold body.

[0017] In some embodiments, a flash molding groove is formed at the bottom of the mold body of the second mold unit, and the flash molding groove is connected to the first mold cavity and the second mold cavity.

[0018] In some embodiments, the included angle between the central axes of two adjacent second cavities is 90°.

[0019] In some embodiments, the inner diameter of the transition portion gradually decreases along the axial direction of the second cavity from one end close to the extrusion portion to one end connected to the smooth portion.

[0020] Second method: This embodiment provides a cross-axis processing method, which is applied to a cross-axis processing device described in the first aspect, and includes the following steps:

[0021] Step S11: based on the first mold unit and the second mold unit being molded together, the second cavity on the first mold unit and the second cavity on the second mold unit are combined to form an extrusion space, and the first cavity on the first mold unit and the first cavity on the second mold unit are combined to form a material storage space;

[0022] Step S12: Based on the material storage space, placing the blank in the material storage space;

[0023] Step S13: Based on the blank being placed in the storage space, drive the first push rod and the second push rod to extrude the blank to deform into a second shape; wherein, the deformation of the blank to the second shape includes the blank extending along the radial direction of the storage space, successively interference fitting with the extrusion part, the boosting part, the transition part, and the smooth part, and then filling the extrusion molding space.

[0024] In order to solve the problem that during the processing of the existing cross shaft, the deformation speeds of various parts of the blank are not completely consistent after the blank is extruded in the mold, resulting in the cavity of the mold not being completely filled, thereby causing the product to be unqualified, the present invention has the following advantages:

[0025] By setting the flash forming groove, when the blank is extruded, part of the blank enters the flash forming groove, which increases the resistance encountered by the blank when it is extruded and deformed. When the blank is deformed from the first cavity to the second cavity, part of the blank enters the flash forming groove, resulting in a decrease in the speed of the blank entering the second cavity from the first cavity, so that the blank can fill the forming extrusion space at the extrusion part and the transition part, and then a qualified cross shaft can be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of some embodiments of a cross-axis processing device;

[0027] Figure 2 It is a schematic diagram of the mold closing structure of the first mold unit and the second mold unit;

[0028] Figure 3 for Figure 2 Sectional view along the AA direction;

[0029] Figure 4 is a schematic structural diagram of a first mold unit in some embodiments;

[0030] Figure 5 is a schematic structural diagram of a first mold unit in some embodiments;

[0031] Figure 6 for Figure 4 A local enlarged schematic diagram of point A in the middle.

[0032] In the figure: 10, first mold unit; 11, mold body; 111, extrusion part; 112, transition part; 113, smooth part; 114, pressurization part; 12, first cavity; 13, second cavity; 14, flash forming groove; 20, second mold unit; 30, first ejector pin; 40, second ejector pin; 50, blank. DETAILED DESCRIPTION

[0033] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0034] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0035] This embodiment discloses a cross-axis processing device, such as Figure 1 to Figure 6 As shown, including:

[0036] A first mold unit 10 and a second mold unit 20; the first mold unit 10 includes a mold body 11, a first cavity 12, and four second cavities 13; the first cavity 12 axially penetrates the mold body 11; the second cavity 13 is symmetrically recessed at the bottom of the mold body 11 along the radial direction of the first cavity 12; one end of the second cavity 13 is connected to the first cavity 12, and the other end is spaced from the outer peripheral surface of the mold body 11;

[0037] The second mold unit 20 is located below the first mold unit 10, and the second mold unit 20 and the first mold unit 10 are arranged in a mirror-symmetrical manner;

[0038] The bottom of the mold body 11 of the first mold unit 10 is concavely provided with a flash molding groove 14, and the flash molding groove 14 is connected with the first mold cavity 12 and the second mold cavity 13;

[0039] a first ejector pin 30 and a second ejector pin 40, wherein the first ejector pin 30 is movably disposed in the first cavity 12 of the first mold unit 10, and the second ejector pin 40 is movably disposed in the first cavity 12 of the second mold unit 20;

[0040] The mold body 11 is provided with a smooth portion 113, a transition portion 112, an extrusion portion 111, and a pressurizing portion 114; the extrusion portion 111 is located at the inner periphery of the mold body 11, and the extrusion portion 111 is located between two adjacent second cavities 13; the smooth portion 113 and the transition portion 112 are located at the mold body 11 of the second cavity 13; the smooth portion 113 is smoothly connected to the extrusion portion 111 through the transition portion 112; the pressurizing portion 114 is located at the bottom of the mold body 11, and the pressurizing portion 114 is located at the side of the flash molding groove 14 close to the extrusion portion 111;

[0041] The first cavity 12, the second cavity 13, and the flash forming groove 14 of the first mold unit 10 and the first cavity 12, the second cavity 13 of the second mold unit 20 together form an extrusion molding space, and the first cavity 12 of the first mold unit 10 and the first cavity 12 of the second mold unit 20 together form a storage space, which is used to accommodate the blank 50.

[0042] In this embodiment, the blank 50 is extruded by the first push rod 30 and the second push rod 40. The first push rod 30 and the second push rod 40 are movably arranged in the first cavity 12 of the first mold body 11 and the second mold body 11 respectively, and the interval between the first push rod 30 and the second push rod 40 and the first cavity 12 can be set as needed. When the first push rod 30 and the second push rod 40 are driven to move relatively close, the first push rod 30 and the second push rod 40 can extrude the blank 50 to deform.

[0043] In this embodiment, by setting the flash forming groove 14, when the blank 50 is extruded, part of the blank 50 enters the flash forming groove 14, and the flash forming groove 14 can increase the resistance encountered by the blank 50 when it is extruded and deformed. When the blank 50 is deformed and transitioned from the first cavity 12 to the second cavity 13, part of the blank 50 enters the flash forming groove 14, resulting in a decrease in the deformation speed of the blank 50 in the process of entering the second cavity 13 from the first cavity 12, so that the blank 50 can fill the forming and extrusion space at the extrusion portion 111 and the transition portion 112, and then a qualified cross shaft can be processed.

[0044] In some embodiments, the width of the flash forming groove 14 is 0.15 to 0.3 times the diameter of the cross shaft.

[0045] In this embodiment, by designing the width of the flash forming groove 14 to be 0.15 to 0.3 times the diameter of the cross shaft, the blank 50 can be extruded and deformed within a certain range when it is extruded, and by designing the width of the flash forming groove 14 to be 0.15 to 0.3 times the diameter of the cross shaft, when the blank 50 is extruded and just fills the flash forming groove 14, the blank 50 can also fill the extrusion molding space of the extrusion portion 111 and the transition portion 112, so that the blank 50 can finally fill the molding space and reduce the weight of the flash, thereby reducing material waste and achieving the purpose of saving material resources.

[0046] In some embodiments, the flash forming groove 14 has a depth of 0.7-1 mm.

[0047] In this embodiment, the depth of the flash forming groove 14 is set to 0.7~1mm, which can enable the pressurizing part 114 to give the blank 50 an appropriate reaction force when the blank 50 is extruded and deformed and abuts against the boosting part 114. When the blank 50 fills the extrusion molding space at the extrusion part 111 and the transition part 112, the boosting part 114 can give the blank 50 a reverse force, thereby accelerating the deformation speed of the blank 50 in the second cavity 13 and improving the processing efficiency of the cross shaft.

[0048] In some embodiments, Figure 4 , Figure 6 As shown, the pressurizing portion 114 protrudes along the radial direction of the first cavity 12 and approaches the extrusion portion 111 .

[0049] In this embodiment, by setting the boosting part 114 to protrude in the radial direction of the first cavity 12 close to the extrusion part 111, the surface of the boosting part 114 abutting against the blank 50 can be an arc surface, thereby increasing the contact area between the boosting part 114 and the blank 50. When the blank 50 abuts against the boosting part 114 during the deformation process, under the condition of a certain deformation pressure of the extruded blank 50, the pressure of the blank 50 on the boosting part 114 can be reduced, thereby protecting the boosting part 114 and preventing the boosting part 114 from cracking when being extruded. And when the blank 50 fills the extrusion molding space at the extrusion part 111 and the transition part 112, the boosting part 114 can exert a large reverse force on the blank 50, thereby accelerating the deformation speed of the blank 50 in the second cavity 13 and improving the processing efficiency of the cross shaft.

[0050] In some embodiments, Figure 5 As shown, the pressurizing portion 114 is recessed away from the extruding portion 111 along the radial direction of the first cavity 12 .

[0051] In this embodiment, by setting the boosting part 114 to be recessed away from the extrusion part 111 in the radial direction of the first cavity 12, the surface of the boosting part 114 abutting against the blank 50 can be an arc surface, thereby increasing the contact area between the boosting part 114 and the blank 50. When the blank 50 abuts against the boosting part 114 during the deformation process, under the condition of a certain deformation pressure of the extruded blank 50, the pressure of the blank 50 on the boosting part 114 can be reduced, thereby protecting the boosting part 114 and preventing the boosting part 114 from cracking when being extruded. And when the blank 50 fills the extrusion molding space at the extrusion part 111 and the transition part 112, the boosting part 114 can exert a large reverse force on the blank 50, thereby accelerating the deformation speed of the blank 50 in the second cavity 13 and improving the processing efficiency of the cross shaft.

[0052] In some embodiments, Figure 4 , Figure 5 As shown, the flash forming groove 14 runs through the outer circumferential surface of the mold body 11 .

[0053] In this embodiment, the flash forming groove 14 is set as a structure that passes through the outer peripheral surface of the mold body 11, so that the extrusion space can be connected to the outside. When the blank 50 is extruded, the gas in the extrusion space is compressed, and the compressed gas can be discharged from the flash forming groove 14, thereby preventing the gas from being squeezed, causing the air pressure in the first cavity 12 and the second cavity 13 to increase, thereby preventing the first mold unit 10 and the second mold unit 20 from bursting.

[0054] In some embodiments, a flash molding groove 14 is formed at the bottom of the mold body 11 of the second mold unit 20 , and the flash molding groove 14 is connected to the first mold cavity 12 and the second mold cavity 13 .

[0055] In this embodiment, a flash forming groove 14 is also recessed at the bottom of the mold body 11 of the second mold unit 20, and the flash forming groove 14 is connected to the first cavity 12 and the second cavity 13, so that the same flash forming groove 14 is provided on the first mold unit 10 and the second mold unit 20. When the blank 50 is extruded, part of the blank 50 can be in the flash forming groove 14 in the first mold unit 10 and the second mold unit 20, which can further increase the friction force of the blank 50 when it is deformed, and can also make the pressure on the first mold unit 10 and the second mold unit 20 more uniform, so that a more complete cross axis can be extruded.

[0056] In some embodiments, Figure 4 , Figure 5 As shown, the included angle between the central axes of two adjacent second cavities 13 is 90°.

[0057] In this embodiment, by setting the angle between the center lines of two adjacent second cavities 13 to 90°, the four second cavities 13 are evenly spaced, so that when the blank 50 is extruded, the extrusion force applied to each second cavity 13 is more uniform, thereby obtaining a more regular cross axis.

[0058] In some embodiments, the inner diameter of the transition portion 112 gradually decreases along the axial direction of the second cavity 13 from one end close to the extrusion portion 111 to one end connected to the smooth portion 113 .

[0059] In this embodiment, by gradually reducing the inner diameter of the transition portion 112 along the axial direction of the second cavity 13 from one end close to the extrusion portion 111 to the end connected to the smooth portion 113, this arrangement enables the blank 50 to be extruded. When the blank 50 fills the space at the extrusion portion 111 and the transition portion 112 of the first mold unit 10 and the second mold unit 20, the deformation speed of the blank 50 can be slightly accelerated when it enters the space of the smooth portion 113, thereby filling the second cavity 13 and further improving the processing efficiency of the cross shaft.

[0060] This embodiment provides a method for processing a cross shaft, comprising the following steps:

[0061] Step S11: Based on the first mold unit 10 and the second mold unit 20 being molded together, the second cavity 13 on the first mold unit 10 and the second cavity 13 on the second mold unit 20 are surrounded by an extrusion space, and the first cavity 12 on the first mold unit 10 and the first cavity 12 on the second mold unit 20 are surrounded by a material storage space;

[0062] Step S12: Based on the material storage space, placing the blank 50 in the material storage space;

[0063] Step S13: Based on the blank 50 being placed in the storage space, drive the first push rod 30 and the second push rod 40 to extrude the blank 50 to deform into a second shape; wherein, the deformation of the blank 50 to the second shape includes the blank 50 extending along the radial direction of the storage space, successively interference fitting with the extrusion portion 111, the boost portion 114, the transition portion 112, and the smooth portion 113, and then filling the extrusion molding space.

[0064] In this embodiment, when the blank 50 is extruded, the contact sequence between the extrusion part 111, the boost part 114, the transition part 112, and the rounded part 113 is as follows: first, it abuts against the extrusion part 111, then it enters the flash forming groove 14 and abuts against the boost part 114, then it abuts against the transition part 112, and finally it abuts against the rounded part 113. By providing the flash forming groove 14, when the blank 50 is extruded, part of the blank 50 enters the flash forming groove 14, and the flash forming groove 14 can increase the resistance of the blank 50 when it is extruded and deformed. When the blank 50 is deformed and transitioned from the first cavity 12 to the second cavity 13, part of the blank 50 enters the flash forming groove 14, resulting in a decrease in the deformation speed of the blank 50 when it enters the second cavity 13 from the first cavity 12, so that the blank 50 can fill the forming and extrusion space at the extrusion part 111 and the transition part 112, and then a qualified cross shaft can be processed. In this embodiment, before the flash forming groove 14 is set, during the processing of the cross shaft, since the volume of the extrusion space located in the second cavity 13 is smaller than the extrusion space in the first cavity 12, when the blank 50 is deformed to the extrusion portion 111 and the transition portion 112 after being extruded, the deformation speed of the blank 50 will suddenly accelerate along the axial direction of the second cavity 13, which may easily lead to the extrusion space of the extrusion portion 111 and the transition portion 112 cannot be filled, thereby making the processed cross shaft unqualified. By providing the flash forming groove 14, the friction force of the blank 50 when it is extruded and deformed can be increased, thereby reducing the axial deformation speed of the blank 50 along the second cavity 13, and by providing the booster portion 114, the booster portion 114 can apply a force toward the extrusion portion 111 to the blank 50 in the flash forming groove 14, so that on the basis of adding the flash forming groove 14, the blank 50 will be gathered at the extrusion portion 111, thereby filling the molding space between the extrusion portion 111 and the transition portion 112, and then processing a qualified cross shaft.

[0065] In this embodiment, after the blank 50 is processed into a cross shaft, burrs are formed on the cross shaft. In order to obtain a finely processed cross shaft, the burrs need to be removed.

[0066] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A cross-axis processing device, characterized in that: include: A first mold unit and a second mold unit; the first mold unit comprises a mold body, a first cavity, and four second cavities; the first cavity penetrates the mold body axially along the mold body; the second cavity is symmetrically recessed at the bottom of the mold body along the radial direction of the first cavity; one end of the second cavity is connected to the first cavity, and the other end is spaced from the outer peripheral surface of the mold body; The second mold unit is located below the first mold unit, and the second mold unit and the first mold unit are arranged in a mirror-symmetrical manner; Wherein, a flash molding groove is concavely provided at the bottom of the mold body of the first mold unit, and the flash molding groove is connected with the first mold cavity and the second mold cavity; A first ejector pin and a second ejector pin, wherein the first ejector pin is movably disposed in the first cavity of the first mold unit; and the second ejector pin is movably disposed in the first cavity of the second mold unit; The mold body is provided with a smooth portion, a transition portion, an extrusion portion, and a pressurizing portion; the extrusion portion is located at the inner periphery of the mold body, and the extrusion portion is located between two adjacent second cavities; the smooth portion and the transition portion are located at the mold body of the second cavity; the smooth portion is smoothly connected to the extrusion portion through the transition portion; the pressurizing portion is located at the bottom of the mold body, and the pressurizing portion is located at the side of the flash forming groove close to the extrusion portion; The first cavity, the second cavity, and the flash forming groove of the first mold unit and the first cavity and the second cavity of the second mold unit are surrounded by an extrusion molding space, and the first cavity of the first mold unit and the first cavity of the second mold unit are surrounded by a material storage space, and the material storage space is used to accommodate blanks; The pressurizing portion protrudes along the radial direction of the first cavity and approaches the extrusion portion; or the pressurizing portion is recessed in the radial direction of the first cavity away from the extrusion portion; The flash forming groove passes through the outer peripheral surface of the mold body; The flash forming groove can increase the friction force of the blank when it is extruded and deformed, thereby reducing the axial deformation speed of the blank along the second cavity. The booster section can apply a force toward the extrusion section to the blank in the flash forming groove, so that the blank will gather at the extrusion section and fill the extrusion molding space between the extrusion section and the transition section.

2. A cross-axis processing device according to claim 1, characterized in that: The width of the flash forming groove is 0.15 to 0.3 times the diameter of the cross shaft.

3. A cross-axis processing device according to claim 2, characterized in that: The depth of the flash forming groove is 0.7-1 mm.

4. A cross-axis processing device according to claim 1, characterized in that: A flash molding groove is concavely formed at the bottom of the mold body of the second mold unit, and the flash molding groove is communicated with the first mold cavity and the second mold cavity.

5. A cross-axis processing device according to claim 1, characterized in that: The included angle between the central axes of two adjacent second cavities is 90°.

6. A cross-axis processing device according to claim 1, characterized in that: The inner diameter of the transition portion gradually decreases along the axial direction of the second cavity from one end close to the extrusion portion to one end connected to the smooth portion.

7. A cross-axis processing method, the method being applied to the cross-axis processing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S11: based on the first mold unit and the second mold unit being molded together, the second cavity on the first mold unit and the second cavity on the second mold unit are combined to form an extrusion space, and the first cavity on the first mold unit and the first cavity on the second mold unit are combined to form a material storage space; Step S12: Based on the material storage space, placing the blank in the material storage space; Step S13: Based on the blank being placed in the storage space, drive the first push rod and the second push rod to extrude the blank to deform into a second shape; wherein, the deformation of the blank to the second shape includes the blank extending along the radial direction of the storage space, successively interference fitting with the extrusion part, the boosting part, the transition part, and the smooth part, and then filling the extrusion molding space.

Images