A crankshaft production preforming die and a crankshaft production line

Abstract

The utility model provides a kind of pre-forging die and crankshaft production line of crankshaft production, comprising: pre-forging upper die and pre-forging lower die, pre-forging upper die has first cavity for forging, pre-forging lower die has second cavity for forging;Wherein, first cavity includes the even first production cavity sequentially arranged along the length direction of pre-forging upper die, second cavity includes the even second production cavity sequentially arranged along the length direction of pre-forging lower die, and even second production cavity is all set with a support piece in the direction of pre-forging upper die.The utility model has the beneficial effects: by setting even second production cavity and even support piece, forging is stably supported in second cavity when producing, without auxiliary positioning mechanism, even crankshaft can balance transverse moment when combined forging, conducive to the guarantee of phase and dynamic balance, and multiple crankshafts are produced simultaneously, and production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft production technology, and in particular to a pre-forging mold and crankshaft production line for crankshaft production. Background Technology

[0002] The crankshaft is a critical component of an engine. It bears the force transmitted from the connecting rod and converts it into torque, which is then output through the crankshaft to drive other parts of the engine. The crankshaft is subjected to the combined effects of centrifugal force from the rotating mass, periodically changing gas inertial force, and reciprocating inertial force, resulting in bending and torsional loads. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the journal surfaces must be wear-resistant, operate evenly, and have good balance.

[0003] Existing crankshafts are produced individually. Due to their irregular shape, the axis is not parallel to the streamline of the forging during forging. There is a unidirectional lateral torque during forging, which makes phase control difficult and dynamic balance difficult to guarantee, thus affecting the production quality. Utility Model Content

[0004] This invention provides a pre-forging die and crankshaft production line for crankshaft production, in order to solve the technical problems of unidirectional lateral torque, difficulty in phase control, and difficulty in ensuring dynamic balance during forging, which affect the production quality.

[0005] This utility model provides a pre-forging die for crankshaft production, comprising:

[0006] A pre-forging upper die, the pre-forging upper die having a first cavity for forging;

[0007] A pre-forging die having a second cavity for forging;

[0008] The first cavity includes an even number of first production cavities arranged sequentially along the length of the upper pre-forging die, and each of the second cavities includes an even number of second production cavities arranged sequentially along the length of the lower pre-forging die. Each second production cavity is arranged opposite to one of the first production cavities, and each of the even number of second production cavities has a support member protruding towards the upper pre-forging die.

[0009] In one embodiment of the present invention, each of the even-numbered support members is provided with a limiting groove for limiting the position of the forging.

[0010] In one embodiment of this utility model, flash bridges are provided on the opposite surfaces of the upper pre-forging die and the lower pre-forging die.

[0011] In one embodiment of the present invention, a guiding mechanism is further provided between the upper pre-forging die and the lower pre-forging die for guiding the upper pre-forging die and the lower pre-forging die when they are closed.

[0012] In one embodiment of the present invention, both the upper pre-forging mold and the lower pre-forging mold are provided with ejection holes for demolding, and an ejection assembly is movably disposed in the ejection holes.

[0013] This application also provides a crankshaft production line, including the aforementioned crankshaft production pre-forging die, and further including a final forging die, wherein the final forging die includes an upper final forging die and a lower final forging die, the upper final forging die having a third cavity for forging, and the lower final forging die having a fourth cavity for forging;

[0014] The third cavity includes an even number of third production cavities, and the fourth cavity includes an even number of fourth production cavities. The third production cavities and the fourth production cavities are arranged in a one-to-one correspondence, and the number of the first production cavities and the number of the third production cavities are the same.

[0015] The final forging die is provided in correspondence with the pre-forging die.

[0016] In one embodiment of the present invention, a first protrusion for processing cutting allowance is provided between adjacent third production chambers, and a second protrusion for processing cutting allowance is provided between adjacent fourth production chambers.

[0017] In one embodiment of the present invention, the radius of the second production chamber is the same as the radius of the fourth production chamber.

[0018] In one embodiment of the present invention, the radius of the second production chamber is greater than the radius of the fourth production chamber.

[0019] In one embodiment of the present invention, the radius of the second production chamber is 1.3:1 to the radius of the fourth production chamber.

[0020] The beneficial effects of this utility model are as follows: The pre-forging mold and crankshaft production line proposed in this utility model, by setting an even number of second production cavities and an even number of support components, allows the forgings to be stably supported in the second cavities during production, eliminating the need for auxiliary positioning mechanisms, thus improving mold strength and extending service life. When an even number of crankshafts are combined for forging, the lateral torque can be balanced, which is beneficial to ensuring phase and dynamic balance. Furthermore, multiple crankshafts can be produced simultaneously, improving production efficiency. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of a pre-forging die structure provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the pre-forging lower die structure provided in one embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of a production line structure provided in one embodiment of the present invention.

[0026] The attached figures are labeled as follows:

[0027] 1. Pre-forging upper die; 2. Pre-forging lower die; 201. Second cavity; 3. Support component; 301. Limiting groove; 4. Final forging upper die; 5. Final forging lower die. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0031] Please see Figure 1 and Figure 2An embodiment of the present invention provides a pre-forging die for crankshaft production, comprising: an upper pre-forging die 1 and a lower pre-forging die 2, wherein the upper pre-forging die 1 has a first cavity for forging, and the lower pre-forging die 2 has a second cavity 201 for forging. The first cavity and the second cavity 201 cooperate and merge to form a pre-forging forming cavity for pre-forging. The first cavity includes an even number of first production cavities arranged sequentially along the length of the upper pre-forging mold 1. Each of the second cavities 201 includes an even number of second production cavities arranged sequentially along the length of the lower pre-forging mold 2. Each second production cavity is arranged opposite to one of the first production cavities. Each of the even number of second production cavities has a support member 3 protruding towards the upper pre-forging mold 1. When producing a three-cylinder crankshaft, there are two of each of the first production cavity, the second production cavity, and the support member 3. When producing a three-cylinder crankshaft, there are at least two of each of the first production cavity, the second production cavity, and the support member 3. This is not limited here. Having an even number (two) of support members 3 ensures stable positioning and prevents uneven force distribution or swaying during forging.

[0032] Specifically, in an optional embodiment of this application, each of the even-numbered support members 3 is provided with a limiting groove 301 for limiting the forging. The limiting groove 301 is a through groove or an arc-shaped groove, which provides a better limiting effect. Correspondingly, a forming groove is provided on the pre-forging upper mold 1. The forming groove and the limiting groove 301 are provided in a corresponding manner. When the pre-forging upper mold 1 and the pre-forging lower mold 2 are pressed together, the forming groove and the limiting groove 301 form a circular groove to form the forging.

[0033] Specifically, in one optional embodiment of this application, flash bridges are provided on the opposite surfaces of the upper pre-forging die 1 and the lower pre-forging die 2.

[0034] Specifically, in an optional embodiment of this application, a guiding mechanism is further provided between the upper pre-forging mold 1 and the lower pre-forging mold 2 for guiding the upper pre-forging mold 1 and the lower pre-forging mold 2 when they are closed, which makes it easier for the upper pre-forging mold 1 and the lower pre-forging mold 2 to close.

[0035] Specifically, in an optional embodiment of this application, both the upper pre-forging mold 1 and the lower pre-forging mold 2 are provided with ejection holes for demolding. An ejection assembly is movably disposed in the ejection hole. The ejection assembly includes a return spring and an ejection rod. An ejection device is provided at the top of the upper pre-forging mold 1, and the output end of the ejection device is connected to the ejection rod of the upper pre-forging mold 1. An ejection device is provided at the bottom of the lower pre-forging mold 2, and the output end of the ejection device is connected to the ejection rod of the lower pre-forging mold 2. The return spring is disposed in the ejection hole, one end of the ejection rod is connected to the return spring, and the other end of the ejection rod passes through the ejection hole. When the upper pre-forging mold 1 and the lower pre-forging mold 2 are closed, the ejection rod returns to the inside of the ejection hole. At this time, the spring is in a normal state. After the upper pre-forging mold 1 and the lower pre-forging mold 2 are separated, the ejection rod moves toward the forging under the force of the ejection device. At this time, the spring is in a compressed state, which makes it easier to eject the forging and demold it.

[0036] Please see Figure 3 This application also provides a crankshaft production line, including the aforementioned crankshaft pre-forging die and a final forging die. The final forging die includes an upper final forging die 4 and a lower final forging die 5. The upper final forging die 4 has a third cavity for forging, and the lower final forging die 5 has a fourth cavity for forging. The third cavity includes an even number of third production chambers, and the fourth cavity includes an even number of fourth production chambers. The third and fourth production chambers are arranged in a one-to-one correspondence, and the number of the first and third production chambers is the same. After the forging is pre-forged in the first and second cavities, the forging is placed in the third and fourth cavities for final forging. The lower final forging die 5 is arranged adjacent to the lower pre-forging die 2.

[0037] Specifically, in an optional embodiment of this application, a first protrusion for machining cutting allowance is provided between adjacent third production chambers, and a second protrusion for machining cutting allowance is provided between adjacent fourth production chambers. The first and second protrusions form an annular protrusion structure, which machines a machining cutting groove between adjacent forgings for cutting. After the forgings have undergone final forging, they are cut along the machining cutting allowance formed by the first and second protrusions, dividing the forgings into an even number of crankshafts, which makes it easier to divide the forgings.

[0038] Specifically, in an optional embodiment of this application, when producing a crankshaft without a balance block, the radius of the second production cavity is the same as the radius of the fourth production cavity.

[0039] Furthermore, when producing crankshafts without balance blocks, when the forging stroke R0 is less than or equal to 55mm, the radius of the second production cavity is the same as the radius of the fourth production cavity, and the bridge surface of the fourth production cavity is at the same height as the bridge surface of the second production cavity; when the forging stroke R0 is greater than 55mm, the radius of the second production cavity is the same as the radius of the fourth production cavity, and the bridge surface of the fourth production cavity protrudes beyond the bridge surface of the second production cavity, that is, the depth of the second production cavity is less than the depth of the fourth production cavity.

[0040] Specifically, in an optional embodiment of this application, when producing a crankshaft with a balance block, the radius of the second production cavity is greater than the radius of the fourth production cavity, and the bridge surface of the fourth production cavity protrudes from the bridge surface of the second production cavity, that is, the depth of the second production cavity is less than the depth of the fourth production cavity.

[0041] Specifically, in an optional embodiment of this application, when producing a three-cylinder crankshaft with a balance block, the ratio of the radius of the second production chamber to the radius of the fourth production chamber is 1.1:1.

[0042] Specifically, in an optional embodiment of this application, when producing a double-link three-cylinder crankshaft with a balance block, the ratio of the radius of the second production chamber to the radius of the fourth production chamber is 1.3:1.

[0043] The radius ratio between the second production chamber and the fourth production chamber can be adjusted according to different production needs, thereby controlling the external dimensions of the crankshaft produced to meet production requirements.

[0044] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A pre-forging die for crankshaft production, characterized in that, include: A pre-forging upper die, the pre-forging upper die having a first cavity for forging; A pre-forging die having a second cavity for forging; The first cavity includes an even number of first production cavities arranged sequentially along the length of the upper pre-forging die, and each of the second cavities includes an even number of second production cavities arranged sequentially along the length of the lower pre-forging die. Each second production cavity is arranged opposite to one of the first production cavities, and each of the even number of second production cavities has a support member protruding towards the upper pre-forging die.

2. The pre-forging die for crankshaft production according to claim 1, characterized in that: Each of the even-numbered support members is provided with a limiting groove for limiting the position of the forging.

3. A pre-forging die for crankshaft production according to any one of claims 1-2, characterized in that: Flash bridges are provided on the opposite surfaces of the upper and lower pre-forging dies.

4. A pre-forging die for crankshaft production according to any one of claims 1-2, characterized in that: A guiding mechanism is also provided between the upper pre-forging die and the lower pre-forging die for guiding the upper pre-forging die and the lower pre-forging die when they are closed.

5. A pre-forging die for crankshaft production according to any one of claims 1-2, characterized in that: Both the upper and lower pre-forging dies are provided with ejection holes for demolding, and an ejection assembly is movably disposed within the ejection holes.

6. A crankshaft production line, comprising a crankshaft pre-forging die as described in any one of claims 1-5, characterized in that, It also includes a final forging die, which includes an upper final forging die and a lower final forging die, the upper final forging die having a third cavity for forging, and the lower final forging die having a fourth cavity for forging; The third cavity includes an even number of third production cavities, and the fourth cavity includes an even number of fourth production cavities. The third production cavities and the fourth production cavities are arranged in a one-to-one correspondence, and the number of the first production cavities and the number of the third production cavities are the same. The final forging die is provided in correspondence with the pre-forging die.

7. A crankshaft production line according to claim 6, characterized in that: A first protrusion for processing cutting allowance is provided between adjacent third production chambers, and a second protrusion for processing cutting allowance is provided between adjacent fourth production chambers.

8. A crankshaft production line according to claim 7, characterized in that: The radius of the second production chamber is the same as the radius of the fourth production chamber.

9. A crankshaft production line according to claim 7, characterized in that: The radius of the second production chamber is greater than the radius of the fourth production chamber.

10. A crankshaft production line according to claim 9, characterized in that: The ratio of the radius of the second production chamber to the radius of the fourth production chamber is 1.3:1.

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