Plastic piston forming mold of automobile air spring

Abstract

The utility model relates to a plastic piston forming die of an automobile air spring, which comprises a movable die set and a fixed die set which are matched with each other and are respectively arranged front and back, and the movable die set comprises a movable die block, a material distributing plate fixed on the front side of the movable die block and an end plate fixed on the front side of the material distributing plate; the fixed module comprises a positioning module, a seat plate arranged on the rear side of the positioning module and an ejection mechanism arranged between the seat plate and the positioning module, and the rear side of the moving module is matched with the front side of the positioning module; a forming mechanism is further arranged between the moving module and the positioning module and comprises a core rod transversely fixed to the front side of the positioning module, two contour forming assemblies arranged on the left side and the right side of the core rod in a diagonal mode, a base fixed to the rear side of the moving module, and a core column transversely inserted and fixed into the base and concentric with the core rod. According to the utility model, the operation steps are simplified, the production efficiency is improved, and the service life of the piston is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to a plastic piston forming mould for an automobile air spring. Background Art

[0002] Air springs are widely used in self-adjusting air suspensions for commercial vehicles, buses, rail vehicles, machinery and equipment, and building foundations. Their working principle is to fill a closed pressure cylinder with inert gas or an oil-gas mixture to make the pressure in the cavity several or dozens of times higher than the atmospheric pressure, and to use the pressure difference generated by the cross-sectional area of ​​the piston rod being smaller than the cross-sectional area of ​​the piston to achieve the movement of the piston rod.

[0003] The piston is a key component in the air spring used to compress air. In order to facilitate production and reduce costs, pistons on the market are almost all plastic parts. Since the center of one end of the piston needs to be fixed to one end of the traction rod, a metal sleeve must be embedded in the center of one end of the piston, so that one end of the traction rod can be fixed in the metal sleeve. However, the existing piston injection mold cannot embed the metal sleeve to a specified extent during injection molding, but needs to embed and fix the metal sleeve into the piston by hot pressing or screwing after injection molding. Therefore, the operation steps are relatively cumbersome, resulting in low production efficiency. Moreover, the fixing firmness between the metal sleeve and the piston by hot pressing or screwing is not high, and it is easy to fall off during subsequent use, which leads to a short service life and needs further improvement. Utility Model Content

[0004] In view of the current status of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide a plastic piston molding mold for an automobile air spring which simplifies the operation steps to improve production efficiency; and greatly improves the fixing firmness between the metal sleeve and the piston to effectively extend the service life of the piston.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a plastic piston forming mold for an automobile air spring, comprising a movable mold group and a fixed mold group that cooperate with each other and are respectively arranged front and back, the movable mold group comprises a moving module, a dividing plate fixed on the front side of the moving module, and an end plate fixed on the front side of the dividing plate; the fixed mold group comprises a positioning module, a seat plate arranged on the rear side of the positioning module, and an ejection mechanism arranged between the seat plate and the positioning module, the rear side of the moving module cooperates with the front side of the positioning module, and is characterized in that:

[0006] A forming mechanism is also provided between the moving module and the positioning module, the forming mechanism comprising a core rod transversely fixed to the front side of the positioning module, two outer contour forming components diagonally arranged on the left and right sides of the core rod, a base fixed to the rear side of the moving module, and a core column transversely inserted and fixed in the base and arranged concentrically with the core rod;

[0007] The outer contour forming assembly includes a slider movably connected to the front side of the positioning module to have a left-right translation function, at least two moving rods obliquely inserted in the slider and distributed sequentially from top to bottom and parallel to each other, and a first side block and a second side block respectively fixed to the front and rear sides of the slider, and the front end of each of the moving rods is fixed to the positioning module;

[0008] A semi-tube groove is provided on one side of the slider close to the mandrel, and a semi-trumpet-shaped groove is formed at the edge of the front opening of the semi-tube groove. Correspondingly, a first semicircular groove is provided on one side of the first side block close to the mandrel, which is concentrically distributed with the end opening of the semi-trumpet-shaped groove. A second semicircular groove is provided on one side of the second side block close to the mandrel, which is concentrically distributed with the rear opening of the semi-tube groove.

[0009] A first core sleeve is formed backward from the center of the end of the core column, and a second core sleeve is formed concentrically backward from the end opening of the first core sleeve, the outer diameter of the second core sleeve is smaller than the outer diameter of the first core sleeve, and the inner diameter of the second core sleeve is larger than the outer diameter of the core rod;

[0010] A step sleeve is formed on the rear side of the base and is concentrically sleeved on the outer side of the end of the core column. A first forming sleeve and a second forming sleeve are formed on the end surface of the step sleeve and are both concentrically arranged with the step sleeve. The second forming sleeve is arranged on the inner side of the first forming sleeve and sleeved outside the first core sleeve.

[0011] Preferably, a plurality of first spoke grooves uniformly distributed at equal angles in the circumferential direction are further provided between the outer walls of the second core sleeve and the first core sleeve, and correspondingly, the first forming sleeve and the second forming sleeve are respectively provided with the same number of second spoke grooves and third spoke grooves uniformly distributed at equal angles in the circumferential direction on their outer walls; each of the second spoke grooves is provided between a corresponding first spoke groove and a third spoke groove.

[0012] Preferably, the molding mechanism further comprises a positioning pin fixed to the end of the core column and coaxially arranged inside the first core sleeve. Correspondingly, the end of the core rod is provided with a countersunk hole coaxially distributed with the positioning pin and cooperating with each other.

[0013] Preferably, a concentrically arranged semicircular thread groove is also formed on the inner wall of the second semicircular groove.

[0014] Preferably, a core block is embedded between the first side block and the slider in an outer contour molding component on the right side. The core block is arranged on the outside of the middle part of the first semicircular groove. An embedded block is formed outward on the inner side of the core block. The embedded block extends into the first semicircular groove, and an arc surface is formed on the end of the embedded block.

[0015] Preferably, a notch groove is provided on the middle inner wall of the first semicircular groove on the first side block in an outer contour forming component on the right side, and correspondingly, a protrusion that cooperates with the notch groove is formed outwardly on the corresponding side outer wall of the step sleeve.

[0016] Preferably, a first L-shaped groove is provided at the outer corner of the protrusion, and correspondingly, a recessed groove intersecting with the bottom surface of the notch groove and cooperating with the first L-shaped groove is also provided on the middle inner wall of the first semicircular groove, the recessed groove intersecting with the inner wall of the notch groove and forming a notch cavity, and the front outer wall of the insert is arranged behind the recessed groove.

[0017] Preferably, an arc-shaped transition surface arranged in an annular direction is formed between the outer edge of the root of the second core sleeve and the outer edge of the end of the first core sleeve.

[0018] Compared with the prior art, the utility model has the advantages that: the utility model can embed the metal sleeve into the front end center of the piston at the same time as the piston is injection molded, and there is no need to arrange an embedding process of the metal sleeve after the piston is injection molded, thereby simplifying the operation steps to improve production efficiency; and greatly improving the fixing firmness between the metal sleeve and the piston to effectively extend the service life of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the exploded structural diagram of the left front side of the utility model;

[0020] Figure 2 It is the exploded structural diagram of the right rear side of the fixed die set and the forming mechanism of the utility model;

[0021] Figure 3 This is a left front structural diagram of the core block of the utility model. DETAILED DESCRIPTION

[0022] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0024] like Figures 1 to 3 As shown, a plastic piston forming mold for an automobile air spring includes a movable mold group 1 and a fixed mold group 2 which cooperate with each other and are respectively arranged front and back. The movable mold group 1 includes a moving module 11, a dividing plate 12 fixed to the front side of the moving module 11, and an end plate 13 fixed to the front side of the dividing plate 12; the fixed mold group 2 includes a positioning module 21, a seat plate 22 arranged at the rear side of the positioning module 21, and an ejection mechanism 23 arranged between the seat plate 22 and the positioning module 21. The rear side of the moving module 11 and the front side of the positioning module 21 cooperate with each other.

[0025] A forming mechanism is also provided between the moving module 11 and the positioning module 21, and the forming mechanism includes a core rod 24 transversely fixed to the front side of the positioning module 21, two outer contour forming components diagonally arranged on the left and right sides of the core rod 24, a base 14 fixed to the rear side of the moving module 11, and a core column 15 transversely inserted and fixed in the base 14 and arranged concentrically with the core rod 24;

[0026] The outer contour forming component includes a slider 25 movably connected to the front side of the positioning module 21 to have a left-right translation function, at least two moving rods 26 obliquely inserted in the slider 25 and distributed sequentially from top to bottom and parallel to each other, and a first side block 27 and a second side block 28 respectively fixed to the front and rear sides of the slider 25, and the front end of each moving rod 26 is fixed to the positioning module 21;

[0027] A semi-tube groove 251 is formed on one side of the slider 25 close to the mandrel 24, and a semi-trumpet-shaped groove 252 is formed on the edge of the front opening of the semi-tube groove 251. Correspondingly, a first semicircular groove 271 is formed on one side of the first side block 27 close to the mandrel 24, and is concentrically distributed with the end opening of the semi-trumpet-shaped groove 252. A second semicircular groove 281 is formed on one side of the second side block 28 close to the mandrel 24, and is concentrically distributed with the rear opening of the semi-tube groove 251.

[0028] A first core sleeve 151 is formed at the center of the end of the core column 15, and a second core sleeve 152 is formed concentrically at the end opening of the first core sleeve 151. The outer diameter of the second core sleeve 152 is smaller than the outer diameter of the first core sleeve 151, and the inner diameter of the second core sleeve 152 is larger than the outer diameter of the core rod 24.

[0029] A step sleeve 141 is formed on the rear side of the base 14 and is concentrically sleeved on the outer side of the end of the stem 15. A first forming sleeve 142 and a second forming sleeve 143 are formed on the end surface of the step sleeve 141 and are concentrically arranged with the step sleeve 141. The second forming sleeve 143 is arranged on the inner side of the first forming sleeve 142 and sleeved outside the first core sleeve 151.

[0030] A plurality of first spoke grooves 153 evenly distributed at equal angles along the circumferential direction are further provided between the outer walls of the second core sleeve 152 and the first core sleeve 151. Correspondingly, the outer walls of the first forming sleeve 142 and the second forming sleeve 143 are respectively provided with the same number of second spoke grooves 144 and third spoke grooves 145 evenly distributed at equal angles along the circumferential direction; each second spoke groove 144 is provided between a corresponding first spoke groove 153 and a third spoke groove 145;

[0031] The forming mechanism further includes a positioning pin 16 fixed to the end of the core column 15 and coaxially arranged inside the first core sleeve 151 . Correspondingly, a countersunk hole 241 coaxially distributed with the positioning pin 16 and cooperating with each other is opened at the end of the core rod 24 .

[0032] A concentrically arranged semicircular thread groove 282 is also formed on the inner wall of the second semicircular groove 281 .

[0033] A core block 29 is also embedded between the first side block 27 and the slider 25 in an outer contour molding component on the right side. The core block 29 is arranged on the outer side of the middle part of the first semicircular groove 271. An embedded block 291 is formed outward on the inner side of the core block 29. The embedded block 291 extends into the first semicircular groove 271, and an arc surface 292 is formed on the end of the embedded block 291.

[0034] A notch groove 272 is provided on the middle inner wall of the first semicircular groove 271 on the first side block 27 in an outer contour forming component on the right side. Correspondingly, a protrusion 146 that cooperates with the notch groove 272 is formed outwardly on the corresponding side outer wall of the step sleeve 141, and a first L-shaped groove 147 is provided at the outer corner of the protrusion 146. Correspondingly, a recessed groove 273 that intersects with the bottom surface of the notch groove 272 and cooperates with the first L-shaped groove 147 is also provided on the middle inner wall of the first semicircular groove 271. The recessed groove 273 intersects with the inner wall of the notch groove 272 and forms a notch cavity 274. The front outer wall of the insert 291 is arranged behind the recessed groove 273.

[0035] A first nameplate column 17 and a second nameplate column 18 arranged transversely are also fixed to the end of the core column 15 , and the first nameplate column 17 and the second nameplate column 18 are both arranged inside the first core sleeve 151 .

[0036] An arcuate transition surface 154 arranged in an annular direction is formed between the outer edge of the root of the second core sleeve 152 and the outer edge of the end of the first core sleeve 151 .

[0037] Working principle: The end plate 13 in the movable mold assembly 1 and the seat plate 22 in the fixed mold assembly 2 are respectively installed on the action mechanism and the body of the injection molding machine; the end plate 13 is driven to move backward with the help of the action mechanism, thereby driving the dividing plate 12 and the movable module 11 to move backward until the rear side of the movable module 11 and the front side of the positioning module 21 are assembled with each other (existing technology); but before that, the metal sleeve 3 needs to be horizontally sleeved on the outside of the positioning pin 16.

[0038] When the movable module 11 moves backward, it will drive the core column 15 to move backward with the help of the base 14 until the core rod 24 is inserted into the second core sleeve 152 and the first core sleeve 151, and the positioning pin 16 is inserted into the countersunk hole 241 at this time; at the same time, when the movable module 11 moves backward, it will also drive each movable rod 26 in the two outer contour forming components to move backward, thereby forcing the two sliders 25 to move relative to each other in the direction of the core rod 24, until the two half-tube grooves 251 and the two half-trumpet-shaped grooves 252 are spliced ​​together and surround the outside of the first core sleeve 151 and the second core sleeve 152; at this time, the first semicircular grooves 271 on the two first side blocks 27 are spliced ​​together and surround the periphery of the root of the first core sleeve 151, and the trapezoidal positioning blocks 91 on the two first side blocks 27 are respectively inserted into the two trapezoidal grooves 42, and the second semicircular grooves 281 on the two second side blocks 28 are spliced ​​together and surround the periphery of the end of the second core sleeve 152.

[0039] Afterwards, the molten material is filled into the two half-tube grooves 251 and the two half-trumpet-shaped grooves 252 through the gates provided in the end plate 13 and the dividing plate 12 and the runner provided in the moving module 11, and is wrapped outside the first core sleeve 151 and the second core sleeve 152. After cooling, the piston 4 is formed; then, the end plate 13 is driven forward by the action mechanism to drive the moving module 11 to leave the positioning module 21, and then the molded piston 4 is ejected forward by the ejection mechanism 23 (prior art); during the forward movement process, the moving module 11 will drive the sliders 25 in the two outer contour molding components to reset in the same way.

[0040] When the two semicircular thread grooves 282 are assembled together, an external thread portion 41 will be formed on the outer wall of the rear end of the piston 4; multiple first spoke grooves 153, multiple second spoke grooves 144 and multiple third spoke grooves 145 form a cavity containing multiple spokes 42 at the front end of the piston 4; the metal sleeve 3 is embedded in the front end center of the cavity; the protrusion 146 is embedded in the notch groove 272, and the first L-shaped groove 147 cooperates with the sink groove 273 and the notch cavity 274 to form a flange 43 on the right side of the front end of the piston 4; the insert 291 and the arc surface 292 cooperate with each other to form an arc-shaped notch 44 behind the flange 43.

[0041] The utility model can embed the metal sleeve 3 into the front end center of the piston 4 while the piston 4 is being injection molded, and thus there is no need to arrange an embedding process of the metal sleeve 3 separately after the piston 4 is injection molded, thereby simplifying the operation steps to improve production efficiency; and greatly improving the fixing firmness between the metal sleeve 3 and the piston 4 to effectively extend the service life of the piston 4.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A plastic piston forming mold for an automobile air spring, comprising a movable mold group and a fixed mold group which cooperate with each other and are respectively arranged front and back, the movable mold group comprising a movable module, a material dividing plate fixed to the front side of the movable module, and an end plate fixed to the front side of the material dividing plate; the fixed mold group comprises a positioning module, a seat plate arranged at the rear side of the positioning module, and an ejection mechanism arranged between the seat plate and the positioning module, the rear side of the movable module cooperates with the front side of the positioning module, and is characterized in that: A forming mechanism is also provided between the moving module and the positioning module, the forming mechanism comprising a core rod transversely fixed to the front side of the positioning module, two outer contour forming components diagonally arranged on the left and right sides of the core rod, a base fixed to the rear side of the moving module, and a core column transversely inserted and fixed in the base and arranged concentrically with the core rod; The outer contour forming assembly includes a slider movably connected to the front side of the positioning module to have a left-right translation function, at least two moving rods obliquely inserted in the slider and distributed sequentially from top to bottom and parallel to each other, and a first side block and a second side block respectively fixed to the front and rear sides of the slider, and the front end of each of the moving rods is fixed to the positioning module; A semi-tube groove is provided on one side of the slider close to the mandrel, and a semi-trumpet-shaped groove is formed at the edge of the front opening of the semi-tube groove. Correspondingly, a first semicircular groove is provided on one side of the first side block close to the mandrel, which is concentrically distributed with the end opening of the semi-trumpet-shaped groove. A second semicircular groove is provided on one side of the second side block close to the mandrel, which is concentrically distributed with the rear opening of the semi-tube groove. A first core sleeve is formed backward from the center of the end of the core column, and a second core sleeve is formed concentrically backward from the end opening of the first core sleeve, the outer diameter of the second core sleeve is smaller than the outer diameter of the first core sleeve, and the inner diameter of the second core sleeve is larger than the outer diameter of the core rod; A step sleeve is formed on the rear side of the base and is concentrically sleeved on the outer side of the end of the core column. A first forming sleeve and a second forming sleeve are formed on the end surface of the step sleeve and are both concentrically arranged with the step sleeve. The second forming sleeve is arranged on the inner side of the first forming sleeve and sleeved outside the first core sleeve.

2. The plastic piston forming mold for an automobile air spring according to claim 1, characterized in that: A plurality of first spoke grooves evenly distributed at equal angles in the circumferential direction are also provided between the outer walls of the second core sleeve and the first core sleeve. Correspondingly, the first forming sleeve and the second forming sleeve are respectively provided with the same number of second spoke grooves and third spoke grooves evenly distributed at equal angles in the circumferential direction on their outer walls; each of the second spoke grooves is provided between a corresponding first spoke groove and a third spoke groove.

3. The plastic piston forming mold for an automobile air spring according to claim 1, characterized in that: The molding mechanism also includes a positioning pin fixed at the end of the core column and coaxially arranged inside the first core sleeve. Correspondingly, the end of the core rod is provided with a countersunk hole coaxially distributed with the positioning pin and cooperating with each other.

4. The plastic piston forming mold for an automobile air spring according to claim 1, characterized in that: A concentrically arranged semicircular thread groove is also formed on the inner wall of the second semicircular groove.

5. The plastic piston forming mold for an automobile air spring according to claim 1, characterized in that: A core block is also embedded between the first side block and the slider in an outer contour forming component on the right side. The core block is arranged on the outside of the middle part of the first semicircular groove. An embedded block is formed outward on the inner side of the core block. The embedded block extends into the first semicircular groove, and an arc surface is formed on the end of the embedded block.

6. The plastic piston forming mold for an automobile air spring according to claim 5, characterized in that: A notch groove is provided on the middle inner wall of the first semicircular groove on the first side block in an outer contour forming component on the right side, and correspondingly, a convex block cooperating with the notch groove is formed outwardly on the corresponding side outer wall of the step sleeve.

7. The plastic piston forming mold for an automobile air spring according to claim 6, characterized in that: A first L-shaped groove is provided at the outer corner of the protrusion, and correspondingly, a recessed groove intersecting with the bottom surface of the notch groove and cooperating with the first L-shaped groove is also provided on the middle inner wall of the first semicircular groove. The recessed groove intersects with the inner wall of the notch groove and forms a notch cavity, and the front outer wall of the insert is arranged behind the recessed groove.

8. The plastic piston forming mold for an automobile air spring according to claim 1, characterized in that: An arc-shaped transition surface arranged in an annular direction is formed between the outer edge of the root of the second core sleeve and the outer edge of the end of the first core sleeve.

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