Engine cooling pipe forming die

Abstract

The utility model discloses an engine cooling pipe forming die, which belongs to the technical field of engine cooling pipe forming, is used for preparing an engine cooling pipe, and comprises an upper die, a middle die and a lower die, the upper die, the middle die and the lower die are combined to form a cavity, and a part of area of the cavity is in a corrugated pipe shape; the middle mold comprises a limiting frame, a mold core and two half blocks; the mold core is arranged between the two half blocks, and the two half blocks are connected into the limiting frame in a sliding mode. The mold core is of a split type and comprises a first core section and a second core section, and the first core section abuts against the second core section; only partial area of the first core section forms a cavity, the area is of a smooth structure, and the first core section is detachably arranged in the limiting frame; the second core section is fixed in the limiting frame; a convex edge is formed at one end, close to the first core section, of the second core section, and the convex edge is higher than other areas of the mold core. According to the mold, the problems of low efficiency and high defect rate when the mold is used for preparing the engine cooling pipe in the related technology are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine cooling pipe forming, in particular to an engine cooling pipe forming die. BACKGROUND

[0002] The engine is the core component of the automobile. In the normal working state, the engine temperature can reach 80 to 90 degrees Celsius. If in the high-intensity working environment, the engine temperature can reach 90 degrees Celsius or above 100 degrees Celsius, many parts are provided around the engine, and the engine cooling pipe is used for circulating the cooling water to the engine, and plays a role of shock absorption and heat insulation.

[0003] In order to adapt to the compact structure of the automobile, the engine cooling pipe is generally a special-shaped pipe, and the structure is relatively complex. The existing die has low precision, and the characteristics of the engine cooling pipe are not designed specifically. In the manufacturing process, product appearance defects are prone to occur, and the existing die is particularly unable to adapt to the subsequent demolding process, which not only leads to low demolding efficiency, but also is prone to quality problems in the demolding process. Once used in the automobile engine, the cooling liquid may leak, and the engine is difficult to be effectively cooled.

[0004] Therefore, it is an urgent problem to be solved in the industrial production of our country to construct an effective forming die for preparing the engine cooling pipe. SUMMARY

[0005] In order to solve the problems of low efficiency and high defect rate in the preparation of the engine cooling pipe by the die in the related art, the present application provides an engine cooling pipe forming die for preparing the engine cooling pipe, which comprises an upper die, a middle die and a lower die, the upper die, the middle die and the lower die are combined to form a forming cavity, and part of the forming cavity is in a bellows shape; the middle die comprises a limiting frame, a die core and two harver blocks; the die core is arranged between the two harver blocks, and the two harver blocks are slidingly connected to the limiting frame; the die core is split type and comprises a first core segment and a second core segment, the first core segment abuts against the second core segment; only part of the first core segment forms the forming cavity, and the part is a smooth structure, and the first core segment is detachably arranged in the limiting frame; the second core segment is fixed in the limiting frame; a convex rib is formed at one end of the second core segment close to the first core segment, and the height of the convex rib is higher than that of other regions of the die core.

[0006] Further, one side of the first core segment abuts against the convex rib.

[0007] Further, the upper die and the lower die clamp the first core segment; convex blocks are formed at the top and / or bottom of the first core segment for embedding the upper die and the lower die respectively; and the convex blocks are located outside the forming cavity.

[0008] Further, the first core segment is formed with a slot at one end close to the second core segment, and the second core segment is formed with a plug post which is inserted into the slot.

[0009] Further, the first core segment is formed with a slot at one end close to the second core segment, and the second core segment is formed with a plug post which is inserted into the slot.

[0010] Further, the lower mold is provided with an upwardly extending limiting table and a limiting post; in the mold clamping state, the limiting table abuts against the outer sides of the two Harver blocks to avoid displacement of the two Harver blocks, and the limiting post is inserted into the limiting frame.

[0011] Further, the lower mold is provided with a plurality of guide posts which are arranged in two rows on the two sides of the cavity and correspond to the positions of the two Harver blocks; the guide posts are inclined, and the top portions of the guide posts on the two sides of the cavity are inclined towards the directions away from the cavity, respectively; the bottom portions of the Harver blocks are correspondingly provided with inclined holes for accommodating the guide posts; and the face of the limiting table opposite to the cavity is also inclined towards the side away from the cavity.

[0012] Further, the upper mold is provided with a glue injection channel which penetrates the upper mold and is communicated with the cavity; the mold core is concave, and the two ends of the mold core are higher than the middle portion of the mold core.

[0013] Further, the top face of the upper mold is formed with a glue injection groove which is S-shaped and meanders along the length direction of the mold core; the glue injection groove is communicated with the glue injection channel; the middle portion of the glue injection groove is provided with a glue injection point for receiving glue material, and the glue injection point is staggered with the glue injection channel.

[0014] Further, the glue injection channel comprises two glue injection channels which are located at the positions close to the two ends of the glue injection groove, respectively.

[0015] Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:

[0016] The engine cooling pipe forming die of the application divides the mold core into two segments which abut against each other, and is provided with a Haver block which can slide in the limiting frame. The engine cooling pipe with complex structure can be vulcanized, and the finished engine cooling pipe can be quickly and non-destructively removed from the mold. In detail, when the mold is opened, the part of the first core segment constituting the forming cavity is smooth, and the user can directly pull out the first core segment from the engine cooling pipe, so that one end of the engine cooling pipe is hollow. The user can insert a pressure gas conveying pipe into the hollow end of the engine cooling pipe, and blow pressure gas into the engine cooling pipe. The pressure gas is opposite to the convex rib of the second core segment, so that the pressure gas can easily pass over the convex rib and continue to flow through the surface of the second core segment, so that the engine cooling pipe slightly expands due to the airflow, and the engine cooling pipe is separated from the second core segment. In the above process, the Haver block can slide in the limiting frame to move away from the engine cooling pipe, so as to provide sufficient expansion space for the engine cooling pipe. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of this application, are used to provide further understanding of the application and allow for the application to be more fully understood. The illustrative embodiments of the application are described in the drawings and the specification herein. In the drawings:

[0018] Figure 1 is a structure schematic diagram of a finished engine cooling pipe;

[0019] Figure 2 is a structure schematic diagram of an open mold state of an engine cooling pipe forming die according to an embodiment of the application;

[0020] Figure 3 is a cross-sectional structure schematic diagram of a closed mold state of an engine cooling pipe forming die according to an embodiment of the application;

[0021] Figure 4 is a structure schematic diagram of a middle mold and lower mold cooperation of an engine cooling pipe forming die according to an embodiment of the application;

[0022] Figure 5 is a structure schematic diagram of a first core segment and a second core segment of an engine cooling pipe forming die according to an embodiment of the application;

[0023] Figure 6 is a structure schematic diagram of a first core segment, a second core segment and an insertion holder of a middle mold of an engine cooling pipe forming die according to an embodiment of the application;

[0024] Figure 7 is a structure schematic diagram of a lower mold of an engine cooling pipe forming die according to an embodiment of the application;

[0025] Figure 8 is a schematic diagram of an upper mold structure of an engine cooling pipe forming mold according to an embodiment of the present application;

[0026] Figure 9 is a schematic diagram of an upper mold structure of an engine cooling pipe forming mold according to an embodiment of the present application;

[0027] Label explanation:

[0028] 100, upper mold; 110, glue injection channel; 120, glue injection groove; 120a, glue injection point;

[0029] 200, middle mold; 210, limiting frame; 220, mold core; 221, first core segment; 2211, protruding block; 2212, insertion slot; 222, second core segment; 2221, protruding rib; 2222, insertion column; 230, Haver block; 240, insertion holding piece; 241, holding rod; 242, insertion holding block; 2421, matching part;

[0030] 300, lower mold; 310, limiting table; 320, limiting column; 330, guide column;

[0031] 400, cavity;

[0032] 1, engine cooling pipe; 11, clamping part; 12, air passage part. DETAILED DESCRIPTION

[0033] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so as to describe the embodiments of the present application.

[0035] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used for better description of 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 indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0036] As shown in Figure 1 , Figure 2 and Figure 3 , the present application provides an engine cooling pipe forming die for manufacturing an engine cooling pipe 1, which comprises an upper die 100, a middle die 200 and a lower die 300, which are combined to form a forming cavity 400, part of the forming cavity 400 is in a bellows shape.

[0037] It is worth noting that the forming cavity 400 is not entirely arranged in a bellows shape, in order to facilitate the connection of the engine cooling pipe 1 with the engine, the two ends of the forming cavity 400 are in a smooth pipe shape, so that the two ends of the formed engine cooling pipe 1 are also in a smooth pipe.

[0038] Specifically, the bellows-shaped forming cavity 400 can correspondingly form a bellows-shaped engine cooling pipe 1, which has high flexibility and can adapt to the compact space inside the automobile.

[0039] As shown in Figure 2 , 3 , the middle die 200 comprises a limiting frame 210, a die core 220 and two Haver blocks 230. The die core 220 is arranged between the two Haver blocks 230, and the two Haver blocks 230 are slidingly connected to the limiting frame 210.

[0040] As shown in Figures 2 to 5 , the die core 220 is split type and comprises a first core segment 221 and a second core segment 222, and the first core segment 221 abuts against the second core segment 222. The first core segment 221 only partially forms the forming cavity 400, and the area is in a smooth structure. The first core segment 221 is detachably arranged in the limiting frame 210, and the second core segment 222 is fixed in the limiting frame 210. The second core segment 222 is formed with a convex rib 2221 at one end close to the first core segment 221, and the height of the convex rib 2221 is higher than that of other areas of the die core 220.

[0041] Specifically, as shown in Figure 1 The engine cooling pipe 1 manufactured by the mold also has the above-mentioned "rib" structure as the clamping part 11 of the engine cooling pipe 1, which aims to enable the engine cooling pipe 1 to be firmly connected to the engine, which is also a common requirement in the market, but this structure also increases the difficulty of demolding the finished product.

[0042] The engine cooling pipe forming mold of the present application, as shown in Figure 4 , Figure 5 The mold core 220 is divided into two segments that abut against each other, and is provided with a Haver block 230 that can slide within the limiting frame 210, which not only vulcanizes the engine cooling pipe 1 with complex structure, but also enables the engine cooling pipe 1 to be quickly and damage-free demolded from the mold.

[0043] In detail, when the mold is opened, the first core segment 221 constitutes a smooth part of the forming cavity 400, and the user can directly pull out the first core segment 221 from the engine cooling pipe 1. One end of the engine cooling pipe 1 is hollow, and the user can insert a pressure gas delivery pipe into the hollow end of the engine cooling pipe 1 and blow pressure gas into the engine cooling pipe 1. The pressure gas is directly opposite the rib 2221 of the second core segment 222, so that the pressure gas can easily pass over the rib 2221 and continue to flow through the surface of the second core segment 222, so that the engine cooling pipe 1 slightly expands due to the airflow, and the engine cooling pipe 1 is separated from the second core segment 222. In the above process, the Haver block 230 slides within the limiting frame 210 to move away from the engine cooling pipe 1, providing sufficient expansion space for the engine cooling pipe 1.

[0044] As a counterexample, the first core segment 221 is integrally formed with the second core segment 222, and the first core segment 221 cannot be separated from the second core segment 222. If the user directly blows gas into the whole mold core 220 with a pressure gas delivery pipe, it will be difficult for the gas to enter the engine cooling pipe 1. If the pressure gas delivery pipe is inserted between the engine cooling pipe 1 and the mold core 220 to blow gas, it will damage the engine cooling pipe 1 and cause serious product defects. Moreover, the above-mentioned counterexample is particularly difficult to apply to the engine cooling pipe 1 in the present application, because the rib 2221 of the second core segment 222 is high, and when the pressure gas delivery pipe is far away from the rib 2221, the pressure gas is difficult to pass through the rib 2221, and the engine cooling pipe 1 cannot be effectively separated from the mold core 220.

[0045] In the present application, since the first core segment 221 can be directly taken out, the distance between the pressure source and the rib 2221 is greatly shortened during subsequent blowing and demolding, the airflow is directly opposite the rib and can quickly pass through the rib 2221, so that the engine cooling pipe 1 can be demolded damage-free and efficiently.

[0046] Further, one end of the second core segment 222 is fixed to the limiting frame 210 away from the first core segment 221. Specifically, only a partial area of the surface of the second core segment 222 constitutes the cavity 400.

[0047] Preferably, as shown in Figure 4 One side of the first core segment 221 abuts against the convex rib 2221, so that the pressure gas conveying pipe can directly face the convex rib 2221 during subsequent demolding, and the efficiency of air blowing demolding is further improved.

[0048] Further, the mold core 220 is coated with colorless Teflon at least on the surface forming the cavity 400. The non-stick property of the Teflon coating can further avoid the adhesion of the cooling pipe product to the mold core 220, and the process of air blowing demolding is used to further improve the demolding efficiency of the engine cooling pipe 1.

[0049] Optionally, the upper mold 100 and the lower mold 300 are chrome-plated on the surface constituting the cavity 400 to increase the service life.

[0050] Since the first core segment 221 of the mold core 220 in the above engine cooling pipe forming mold has high flexibility, the first core segment 221 may be displaced due to the pressure of the rubber during the vulcanization process of the product, thereby causing product defects. To solve this problem, preferably, the upper mold 100 and the lower mold 300 clamp the first core segment 221 to avoid displacement of the first core segment 221.

[0051] Specifically, as shown in Figure 4 The top and / or bottom of the first core segment 221 is formed with a protrusion 2211 for embedding into the upper mold 100 and the lower mold 300, respectively; the protrusion 2211 is located outside the cavity 400, so that the first core segment 221 is firmly clamped by the upper mold 100 and the lower mold 300.

[0052] Preferably, as shown in Figure 5 The first core segment 221 is formed with a slot 2212 at one end close to the second core segment 222, and the second core segment 222 is formed with a plug 2222 inserted into the slot 2212, so that the first core segment 221 and the second core segment 222 are more closely matched.

[0053] Preferably, as shown in Figure 6As shown, the engine cooling pipe forming die further comprises an insertion holder 240, which comprises a holding rod 241 and an insertion block 242 located at the end of the holding rod 241; the two ends of the first core section 221 are through, and an annular gap is left between the insertion slot 2212 and the insertion column 2222; the insertion block 242 is formed with an annular matching part 2421, which is inserted into the first core section 221, and the matching part 2421 fills at least part of the annular gap. Before the mold is opened, the insertion holder 240 can be inserted into the first core section 221 to hold the first core section 221, so that the first core section 221 does not fall off from the limiting frame 210 when the mold is opened. At the same time, the user can also pull out the first core section 221 through the insertion holder 240, which is safer. During the vulcanization process of the mold, the insertion holder 240 can also be left in the first core section 221 without interfering with the vulcanization work of the mold.

[0054] In order to further ensure the accuracy of the cooperation between the engine cooling pipe mold inner components, and prevent the movement between the components during the mold closing and vulcanization process, such as Figure 7 As shown, the lower mold 300 is provided with an upward extending limiting table 310 and a limiting column 320; in the mold closed state, the limiting table 310 abuts against the outer side of the two Haver blocks 230 to avoid displacement of the two Haver blocks 230, and the limiting column 320 is inserted into the limiting frame 210.

[0055] Further, as shown in Figure 7 As shown, the lower mold 300 is further provided with a plurality of guide columns 330, which are arranged on both sides of the cavity 400 corresponding to the positions of the two Haver blocks 230. The guide columns 330 are inclined, and the top parts of the guide columns 330 located on both sides of the cavity 400 are inclined towards the direction away from the cavity 400, and the bottom parts of the Haver blocks 230 are correspondingly provided with inclined holes for accommodating the guide columns 330. In order to cooperate with the guide columns 330, the side of the limiting table 310 facing the cavity 400 is also inclined towards the side away from the cavity 400. In this way, when the middle mold 200 is separated from the lower mold 300, the two Haver blocks 230 can be directly separated under the action of the guide columns 330, and the user does not need to manually separate the Haver blocks, reducing the user's work burden.

[0056] Preferably, as shown in Figure 8 As shown, the upper mold 100 is provided with a glue injection channel 110 penetrating through the upper mold 100, and the glue injection channel 110 is communicated with the cavity 400; as shown in Figure 3As shown, the mold core 220 is concave, and the two ends of the mold core 220 are higher than the middle part of the mold core 220, so that the glue in the cavity 400 flows more controllably, and the glue can gradually accumulate from the middle part of the mold core 220 to the two ends of the mold core 220. If the middle part of the mold core 220 is higher than the two ends of the mold core 220, the glue will be more likely to leak out from the two ends of the mold core 220 due to gravity, which will aggravate product defects.

[0057] Specifically, as shown in Figure 8 、 9 The top surface of the upper mold 100 is formed with a glue injection groove 120, which is S-shaped and meanders along the length direction of the mold core 220. The glue injection groove 120 is connected with the glue injection channel 110, and the middle part of the glue injection groove 120 is provided with a glue injection point 120a for receiving glue, which is staggered with the glue injection channel 110. Therefore, the full-arc segment design of the S-shaped glue injection groove 120 can prolong the time of glue entering the cavity 400 and retain the kinetic energy of the glue. In combination with the concave design of the mold core 220, the glue can fill the entire corrugated cavity 400 smoothly, effectively avoiding some defects in the glue injection process, such as air bubbles, runner joint marks, etc.

[0058] More specifically, as shown in Figure 8 、 9 The glue injection channel 110 includes two, which are respectively located at the positions close to the ends of the glue injection groove 120.

[0059] Preferably, the glue injection channel 110 gradually shrinks towards the cavity 400, and the diameter of the inlet end is larger than that of the outlet end, so that the glue injection is more smooth. Specifically, the diameter of the inlet end of the glue injection channel 110 is 6-10 mm, and the diameter of the outlet end is 2-4 mm.

[0060] As a specific solution, the embodiment also provides an engine cooling pipe forming method, which is applied to the engine cooling pipe forming mold in the above-mentioned solutions and includes the following steps.

[0061] Step one: the upper mold 100, the middle mold 200 and the lower mold 300 are closed and vulcanized, and after vulcanization is completed, the upper mold 100, the middle mold 200 and the lower mold 300 are opened, and the middle mold 200 moves away from the upper mold 100 and the lower mold 300.

[0062] Optionally, before step one, a cutting machine can be used to form a semi-finished glue, and then the semi-finished glue is injected into the engine cooling pipe forming mold in the embodiment through an injection vulcanizing machine.

[0063] Step two: the two Haver blocks 230 move away from the cavity 400, the first core segment 221 of the mold core 220 is separated from the second core segment, and the first core segment 221 of the mold core 220 is taken out, so that one end of the engine cooling pipe 1 is in a hollow open state, as shown inFigure 1 As shown, the hollow end of the engine cooling pipe 1 serves as a vent 12.

[0064] Alternatively, the two Haver blocks 230 can be manually moved away from the cavity 400, or the lower mold 300 can be provided with guide posts 330, and during the process of moving the middle mold 200 away from the lower mold 300, the Haver blocks 230 are moved away from the cavity 400 under the action of the guide posts 330.

[0065] Since the first core section 221 can be removed from the limiting frame 210, the Haver blocks 230 can be slid away from the engine cooling pipe 1, without causing any interference to the subsequent expansion of the engine cooling pipe 1 during demolding, thereby providing sufficient space for the engine cooling pipe 1 to be separated from the second core section 222.

[0066] Preferably, the first core section 221 can be removed from the limiting frame 210 by the insertion holder 240, so as to prevent the user from being scalded during the operation.

[0067] Step three: inserting the pressure gas conveying pipe into the vent 12, and inputting the pressure gas into the engine cooling pipe 1 through the pressure gas conveying pipe. The pressure gas flows through the convex rib 2221 of the second core section 222 of the mold core 220, and continues to flow through the surface of the second core section 222, so that the inner wall of the engine cooling pipe 1 is separated from the second core section 222.

[0068] Further, in step three, after the pressure gas conveying pipe is inserted into the vent 12, the fastener is clamped outside the vent 12, so as to prevent the pressure gas conveying pipe from being separated from the engine cooling pipe 1 during the gas conveying process.

[0069] Step four: removing the pressure gas conveying pipe from the vent 12, and extracting the engine cooling pipe 1 from the second core section 222.

[0070] In the above steps, the second core section 222 and the Haver blocks 230 can always remain in the middle mold, and during the re-vulcanization, the first core section 221 only needs to be refilled into the middle mold, so as to be used again, thereby achieving fast operation.

[0071] In the present application, the terms “mount”, “set”, “provided with”, “connected”, “linked”, “sleeved” should be understood in a broad sense. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0072] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An engine cooling pipe forming die for producing an engine cooling pipe, characterized by, The upper die, the middle die and the lower die are combined to form a cavity, and a part of the cavity is in a bellows shape; The middle die comprises a limiting frame, a die core and two Haver blocks; The die core is arranged between the two Haver blocks, and the two Haver blocks are slidingly connected to the limiting frame; The die core is split type and comprises a first core segment and a second core segment, the first core segment abuts against the second core segment, the first core segment only partially forms the cavity, and the part is in a smooth structure, the first core segment is detachably arranged in the limiting frame, the second core segment is fixed in the limiting frame, and a convex rib is formed at one end of the second core segment close to the first core segment, and the height of the convex rib is higher than that of other parts of the die core.

2. The engine cooling pipe forming die according to claim 1, wherein: One side of the first core segment abuts against the convex rib.

3. The engine cooling pipe forming die according to claim 1, wherein: The upper die and the lower die clamp the first core segment; The top and / or the bottom of the first core segment is formed with a convex block for embedding into the upper die and the lower die respectively, and the convex block is located outside the cavity.

4. The engine cooling pipe forming die according to claim 3, wherein: The first core segment is formed with a slot at one end close to the second core segment, and the second core segment is formed with a plug column which is inserted into the slot.

5. The engine cooling pipe forming die according to claim 4, wherein: It further comprises a plug holder, the plug holder comprises a handle and a plug block, and the plug block is located at the end of the handle; Both ends of the first core segment are through, and there is an annular gap between the slot and the plug column; The plug block is formed with an annular matching part, the matching part is inserted into the first core segment, and the matching part fills at least part of the annular gap.

6. The engine cooling pipe forming die according to claim 1, wherein: The lower die is provided with a limiting table and a limiting column extending upward; In the die closing state, the limiting table abuts against the outer side of the two Haver blocks to avoid displacement of the two Haver blocks, and the limiting column is inserted into the limiting frame.

7. The engine cooling pipe forming die according to claim 6, wherein: The lower die is further provided with a plurality of guide columns, and the plurality of guide columns are arranged in correspondence with the positions of the two Haver blocks on both sides of the cavity; The guide columns are inclined, and the top parts of the guide columns on both sides of the cavity are inclined toward the directions away from the cavity, and the bottom parts of the Haver blocks are correspondingly provided with inclined holes for accommodating the guide columns; One side of the limiting table facing the cavity is also inclined away from the cavity.

8. The engine cooling pipe forming die according to claim 1, wherein: The upper die is provided with a glue injection channel penetrating through the upper die, and the glue injection channel communicates with the cavity; The die core is concave, and the both ends of the die core are higher than the middle part of the die core.

9. The forming die for an engine cooling pipe according to claim 8, characterized in that: the top surface of the upper die is formed with a glue injection groove, the glue injection groove is S-shaped, and winds along the length direction of the die core; the glue injection groove is communicated with the glue injection channel; the middle part of the glue injection groove is provided with a glue injection point for receiving glue, and the glue injection point is staggered with the glue injection channel.

10. The forming die for an engine cooling pipe according to claim 9, characterized in that: the glue injection channel comprises two, which are respectively located at the positions close to the two ends of the glue injection groove.

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