Piston runner structure
By designing the piston gating structure and changing the flow path of the molten aluminum, the problems of poor feeding and watermarks caused by the molten aluminum directly entering the piston casting cavity were solved, thus improving the forming quality of the piston.
Patent Information
- Application Number
- CN202423045793.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-11
AI Technical Summary
In the existing technology, when the piston is cast, the molten aluminum directly enters the piston casting cavity, which leads to poor feeding and watermarks in the piston cavity, affecting the piston performance.
Design a piston gating structure including a sprue, a gating system, and a secondary runner. Molten aluminum enters the bottom of the piston casting chamber at an angle through the secondary runner and continues to flow out at the horizontal height of the gating system, thereby changing the flow path of the molten aluminum and reducing shrinkage of the piston skirt and watermarks in the inner cavity.
By optimizing the flow path of molten aluminum, the water ripples inside the piston cavity were improved, thus enhancing the piston's forming quality.
Smart Images
Figure CN223629464U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to piston casting equipment technical field, concretely relates to a piston runner structure. BACKGROUND
[0002] The piston needs to be in the high temperature, high pressure, high speed harsh environment in the engine for a long time, therefore needs the piston to have good performance, and the piston casting is the key factor influencing its performance, the piston casting of prior art, the main runner directly flows through the middle section of piston pouring cavity, and the aluminum liquid is directly poured into the piston pouring cavity from the main runner, resulting in the phenomenon of poor feeding and piston inner cavity water mark when the aluminum liquid is cast, causing the performance of the cast piston to be poor. SUMMARY
[0003] The utility model discloses a kind of piston runner structures.
[0004] The utility model provides the following technical scheme:
[0005] The utility model provides a kind of piston runner structure, including sprue and the transverse runner of the communication end of sprue, the transverse runner is communicated with piston pouring cavity at the end away from the sprue;The lower portion of the transverse runner is also communicated with auxiliary runner, and the auxiliary runner is connected with the bottom of piston pouring cavity;The middle part of the piston pouring cavity has pin hole for insert piece insertion, and the center of the pin hole is lower than the horizontal height of the transverse runner.
[0006] Further, the auxiliary runner is obliquely arranged, and the included angle α between the transverse runner and the auxiliary runner is 135°-150°.
[0007] Further, the width L2 of the auxiliary runner is 15% of the width L1 of the transverse runner.
[0008] Further, the horizontal height L3 between the center of the pin hole and the bottom of the transverse runner is 0-5 cm.
[0009] Compared with prior art, the piston runner structure provided by the utility model, in actual application, aluminum liquid first fills the bottom of piston pouring cavity from auxiliary runner to reach the same horizontal height with transverse runner, and continues to pour to flow out from the outlet runner above the piston pouring cavity, by changing the flow path of aluminum liquid, piston skirt shrinkage is reduced, and piston inner cavity water mark is improved. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 The piston runner structure provided by the utility model is shown in the schematic diagram.
[0011] In the figure, 1 is a straight runner, 2 is a transverse runner, 3 is a piston pouring cavity, 4 is an auxiliary runner, and 5 is a pin hole. DETAILED DESCRIPTION
[0012] The utility model makes further illustration in combination with the drawings.
[0013] In an embodiment of the utility model, a piston runner structure, including the sprue 1 and the cross runner 2 who links up the end of the sprue 1, the cross runner 2 is linked up with the piston pouring cavity 3 in the end away from the sprue 1, still be linked up with the sub runner 4 under the cross runner 2, the sub runner 4 is linked with the bottom of piston pouring cavity 3, the middle part of piston pouring cavity 3 has the pin hole 5 for the insert of insert, the center of pin hole 5 is lower than the horizontal height of cross runner 2, the aluminum liquid in cross runner 2 flows to the bottom of piston pouring cavity 3 from the sub runner, and the aluminum liquid is poured upwards from the bottom of piston pouring cavity 3, so as to reduce the piston skirt shrinkage and improve the piston inner cavity water mark.
[0014] In an embodiment of the utility model, the sub runner 4 is obliquely arranged, and the included angle α between the cross runner 2 and the sub runner 4 is 135°-150°, so as to facilitate the flow of the aluminum liquid and the feeding.
[0015] In an embodiment of the utility model, the width L2 of the sub runner 4 is 15% of the width L1 of the cross runner 2, so as to control the flow and improve the piston inner cavity water mark.
[0016] In an embodiment of the utility model, the horizontal height L3 between the center of the pin hole 5 and the bottom of the cross runner 2 is 0-5 cm, so as to ensure that the aluminum liquid flows to the bottom of the piston pouring cavity 3 from the sub runner 4, and then is poured upwards from the bottom of the piston pouring cavity 3 to the upper part of the piston pouring cavity 3, so as to reduce the piston skirt shrinkage and improve the piston inner cavity water mark.
[0017] In actual application, the aluminum liquid is first poured into the bottom of the piston pouring cavity from the sub runner, and then reaches the same horizontal height as the cross runner, and then is continuously poured out from the outlet of the piston pouring cavity.
[0018] The embodiments of the utility model are given for example and description, although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as the limitation of the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.
Claims
1. A piston gate structure, characterized by: The sprue includes a straight sprue and a cross sprue connected to the end of the straight sprue, the cross sprue is connected to a piston cavity at one end away from the straight sprue; the cross sprue is also connected to a sub runner, the sub runner is connected to the bottom of the piston cavity; the middle part of the piston cavity has a pin hole for inserting an insert, the center of the pin hole is lower than the horizontal height of the cross sprue.
2. A piston gate structure according to claim 1, wherein: The sub runner is arranged obliquely, the included angle α between the cross sprue and the sub runner is 135°-150°.
3. A piston gate structure according to claim 1, wherein: The width L2 of the sub runner is 15% of the width L1 of the cross sprue.
4. A piston gate structure according to claim 1, wherein: The horizontal height L3 of the center of the pin hole to the bottom of the cross sprue is 0-5 cm.