Combined temperature-control spinning mandrel device with rib grooves and design method

Abstract

The invention belongs to the technical field of mold design, and discloses a combined temperature-control spinning core mold device with rib grooves and a design method. The device comprises a locking nut, a locking ring, a driven rib groove core mold, a driving conical core mold, an oil groove tail top ring and a conical central shaft, a plurality of driven rib groove core molds jointly form a rib groove structure ring set of an annular structure, the rib groove structure ring set is arranged on the driving conical core mold in a sleeving mode, a plurality of rib groove structure ring sets are arranged on the axis of the conical center shaft, and the multiple rib groove structure ring sets jointly form an inner rib core mold of a barrel structure. Rib grooves are formed in the outer surface of the driven rib groove core mold, and the rib grooves in the outer surface of the inner rib core mold jointly form a honeycomb-shaped grid groove body structure. According to the die, the function of simple installation is achieved through the split type oil guide pipeline design, the combined type inner rib core die and the replaceable modular structure design, active temperature control machining of a deformation area is achieved, and the die is suitable for large-size and multi-rib light alloy barrel-shaped components with inner ribs.

Description

Technical Field

[0001] This invention relates to the field of mold design technology, specifically to a combined temperature-controlled spinning core mold device with rib grooves and its design method. Background Technology

[0002] Existing Chinese invention patents CN108213164A and CN109396262A disclose two types of spin forming mandrel devices and methods for ribbed structures. It is not difficult to see that the two types of devices disclosed have the following defects:

[0003] 1. The installation sequence of the core mold device for forming complex internally ribbed cylindrical parts is fixed, and the complexity of the installation is affected by the density and number of rib grooves. It is not suitable for forming cylindrical components with large diameter and complex internal rib structure.

[0004] 2. The repeated disassembly and assembly of the mold accelerates the wear of the mold, reduces its service life, and also reduces the forming accuracy of the spun components;

[0005] 3. The lack of a heat-compensating structure results in reduced overall plasticity and lower rib height during the lightweight alloy filling process due to the temperature difference at the interface.

[0006] To address this, this invention patent proposes a combined temperature-controlled spinning core mold device and design method with ribbed grooves. By dividing the overall mold into identical shape units and adding a heat-replenishing structure, it achieves simple assembly and overall temperature control of the spinning core mold for complex internal rib components. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a combined temperature-controlled spinning mandrel device with ribbed grooves and its design method, thereby resolving the issues in the prior art. To achieve the above-mentioned objective, the technical solution adopted by this invention is as follows:

[0008] A combined temperature-controlled spinning core mold device with ribbed grooves includes a locking nut 1, a locking ring 2, a passive ribbed groove core mold 3, an active conical core mold 4, an oil groove tail ring 5, and a conical central shaft 6;

[0009] The locking ring 2 and the oil groove tail ring 5 are sleeved on the conical central shaft 6. One end of the conical central shaft 6 is threaded to the locking nut 1, and the locking nut 1 abuts against the locking ring 2. The active conical core mold 4 is provided between the oil groove tail ring 5 and the locking ring 2. The active conical core mold 4 is sleeved on the conical central shaft 6.

[0010] Multiple passive ribbed core molds 3 together form a ring-shaped ribbed structure ring group, which is sleeved on the active conical core mold 4. Multiple ribbed structure ring groups are arranged on the axis of the conical central shaft 6, and the multiple ribbed structure ring groups together constitute the inner ribbed core mold of the cylindrical structure. On the axis and circumferential direction of the conical central shaft 6, two adjacent passive ribbed core molds 3 abut against each other without gap. The two ends of the inner ribbed core mold abut against the locking ring 2 and the oil groove tail ring 5, respectively. The inner ribbed core mold is detachably connected to the active conical core mold 4.

[0011] The outer surface of the passive rib core mold 3 is provided with rib grooves 3-1, and the rib grooves 3-1 on the outer surface of the inner rib core mold together form a honeycomb grid groove structure.

[0012] The inner surface of the passive ribbed core mold 3 is connected to the outer surface of the active conical core mold 4 via a dovetail structure.

[0013] Furthermore, multiple active conical core molds 4 are arranged around the conical central axis 6, and the multiple active conical core molds 4 together constitute a cylindrical structure, on which the inner rib core mold is sleeved;

[0014] The inner surface of the passive ribbed core mold 3 is a first arc surface 3-3, and the outer surface of the active conical core mold 4 is a second arc surface 4-2. The first arc surface 3-3 and the second arc surface 4-2 fit and adapt to each other.

[0015] Two symmetrically distributed half-width dovetail grooves 3-2 are provided on the first arc surface 3-3. The half-width dovetail grooves 3-2 on opposite sides of the two adjacent passive rib groove core molds 3 in the circumferential direction together form a dovetail groove structure. A dovetail 4-1 is provided on the second arc surface 4-2. The dovetail 4-1 is on the dovetail groove structure, so that the active conical core mold 4 and the passive rib groove core mold 3 fit tightly without gaps.

[0016] Furthermore, one end of the passive rib groove core mold 3 is provided with an oil guide countersink 3-6, and the other end is fixedly connected to an oil guide boss 3-5. The oil guide boss 3-5 and the oil guide countersink 3-6 are connected through a through hole 3-4. On the axis of the conical central shaft 6, the oil guide bosses 3-5 and oil guide countersinks 3-6 of two adjacent passive rib groove core molds 3 are inserted into each other, thereby realizing that multiple passive rib groove core molds 3 on the axis are connected end to end in sequence.

[0017] Furthermore, the locking ring 2 abuts against one end of the inner rib core mold, and the locking ring 2 is provided with a positioning hole 2-1 that matches the oil guide boss 3-5. The oil guide boss 3-5 of the passive rib core mold 3 located at the end is inserted into the corresponding positioning hole 2-1.

[0018] The oil groove tail ring 5 abuts against the other end of the inner rib core mold, and the oil groove tail ring 5 is provided with an arc-shaped oil groove 5-1; the end faces of the two circumferentially adjacent passive rib core molds 3 located at the end fit against the arc-shaped oil groove 5-1 to form an oil return chamber; the oil guide holes 3-6 of the two circumferentially adjacent passive rib core molds 3 are respectively located at both ends of the arc-shaped oil groove 5-1 and connect to the oil return chamber, thereby forming a connected "U"-shaped oil path on the axis.

[0019] Furthermore, the rib groove 3-1 is a regular polygon, and the four sides of the passive rib groove core mold 3 are provided with the opening groove of the rib groove 3-1, so that the rib grooves 3-1 of the multiple passive rib groove core molds 3 in the axial and circumferential directions together form a connected honeycomb grid groove structure.

[0020] A method for designing a combined temperature-controlled spinning mandrel with ribs and grooves includes the following steps:

[0021] Step 1: Design the circumferential unfolding structure of the rib grooves on the surface of the complex internal rib core mold: The surface of the internal rib core mold is composed of several regular polygonal rib grooves 3-1 arranged periodically. Each regular polygonal rib groove 3-1 includes k sides, and k equal-length ribs are connected end to end to form a rib groove unit. Adjacent rib grooves 3-1 overlap on one side to form a honeycomb grid groove structure. The honeycomb grid groove structure is evenly divided into passive rib groove core molds 3. Each passive rib groove core mold 3 includes a complete regular polygonal rib groove 3-1 and four 1 / 4 regular polygonal grooves. The four 1 / 4 regular polygonal grooves are located at the four corners of the passive rib groove core mold 3, and the rib groove 3-1 is located at the center of the passive rib groove core mold 3.

[0022] Where k ≥ 4, and k is an even number;

[0023] Step 2: Determine the dimensions of the passive rib groove core mold 3: Using the division method from Step 1, the honeycomb mesh groove structure is divided into n parts along the circumferential direction. The included angle between the boundaries of adjacent passive rib groove core molds 3 satisfies Formula 1:

[0024]

[0025] In the formula, n is the number of circumferential passive rib groove core molds, satisfying n≥2 and n is an even number;

[0026] The arc length and width of the passive rib groove core mold 3 are the distances between the geometric center points of the four 1 / 4 regular polygon rib grooves in the circumferential and axial directions, respectively.

[0027] For the regular quadrilateral rib groove 3-1:

[0028]

[0029] For the rhomboid groove 3-1:

[0030]

[0031] For the horizontally placed regular hexagonal rib groove 3-1:

[0032]

[0033] For the longitudinally placed regular hexagonal rib groove 3-1:

[0034]

[0035] For the regular octagonal rib groove 3-1:

[0036]

[0037] In the formula, R is the outer diameter of the passive rib groove core mold 3, and t is the width of the rib groove; the dimensions of other regular polygonal structures are calculated sequentially.

[0038] Step 3: Determine the dimensions of the active conical core mold 4: Design the dimensions of the dovetail 4-1 based on the dimensions of the dovetail groove structure formed by the passive rib groove core molds 3, leaving gaps in the height and width directions to ensure smooth assembly and disassembly of the core mold; the dimensions of the second arc surface 4-2 are the same as those of the first arc surface 3-3. After the dovetail 4-1 is installed, the two arc surfaces abut each other with gaps to ensure smooth assembly and disassembly; the active conical core mold 4 has a conical shaft with a draft angle α on the surface opposite to the arc surface; the length of the active conical core mold 4 is the sum of the widths of the oil groove tail ring 5, the locking ring 2, and the i passive rib groove core molds 3;

[0039] Step 4: Determine the number of passive rib groove core molds 3 and active conical core molds 4: The number of passive rib groove core molds 3 per unit width in the axial direction is the same as the number of active conical core molds 4, which is n, and the number is even; the number of passive rib groove core molds 3 along the X-axis is n×i, i=1,2,3…; and the total width of the passive rib groove core molds is the sum of the unit widths of i passive rib groove core molds 3;

[0040] Step 5: Verification of the rationality of mold size design: There are no gaps between the rib structure ring group composed of several passive rib core molds 3 in the circumferential direction; the oil guide boss 3-5 and the oil guide countersunk hole 3-6 are installed without error; the dovetails 4-1 of several active conical core molds 4 in the circumferential direction can smoothly pass through the half-width dovetail groove 3-2 and the dovetail grooves of the oil groove tail ring 5 and the locking ring 2; after the passive rib core mold 3 and the active conical core mold 4 are assembled, the outer surface of the whole is cylindrical; the conical central shaft 6 fits against the conical surface of the active conical core mold 4 and is secured by the locking nut 1; after installation, there is no axial slippage of each component.

[0041] The present invention has the following beneficial effects:

[0042] This invention uses replaceable passive rib groove core molds and active conical core molds to solve the molding quality problems caused by mold wear. The mold achieves simple installation through a split oil guide pipeline design, a combined internal rib core mold and a replaceable modular structure design. The installation process is simple and can easily realize the mechanized assembly of complex molds. It can realize active temperature control processing in the deformation zone and is suitable for forming large-sized, lightweight alloy cylindrical components with internal ribs.

[0043] This invention achieves the assembly of complex internal rib core molds and rigid connection of various parts through the precise fit of dovetail grooves and dovetails; by arranging oil pipe circuits in the oil guide pipeline and then introducing high-temperature heat transfer oil, a stable temperature field is formed on the surface of the passive rib mold, thereby realizing active temperature control of the mold. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0045] Figure 2 This is a schematic diagram of the locking ring;

[0046] Figure 3 Schematic diagram of passive rib groove core mold Figure 1 ;

[0047] Figure 4 Schematic diagram of passive rib groove core mold Figure 2 ;

[0048] Figure 5 Schematic diagram of active conical core mold;

[0049] Figure 6 Schematic diagram of the oil tank tail ring;

[0050] Figure 7 This is a schematic diagram of the central axis of the cone. Detailed Implementation

[0051] The following will be based on embodiments of the present invention. Figures 1-7 The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0052] like Figure 1 A combined temperature-controlled spinning core mold device with rib grooves includes a locking nut 1, a locking ring 2, a passive rib groove core mold 3, an active conical core mold 4, an oil groove tail ring 5, and a conical central shaft 6.

[0053] The locking ring 2 and the oil groove tail ring 5 are sleeved on the conical central shaft 6. One end of the conical central shaft 6 is threaded to the locking nut 1, and the locking nut 1 abuts against the locking ring 2. The active conical core mold 4 is provided between the oil groove tail ring 5 and the locking ring 2. The active conical core mold 4 is sleeved on the conical central shaft 6.

[0054] Multiple passive ribbed core molds 3 together form a ring-shaped ribbed structure ring group, which is sleeved on the active conical core mold 4. Multiple ribbed structure ring groups are arranged on the axis of the conical central shaft 6, and the multiple ribbed structure ring groups together constitute the inner ribbed core mold of the cylindrical structure. On the axis and circumferential direction of the conical central shaft 6, two adjacent passive ribbed core molds 3 abut against each other without gap. The two ends of the inner ribbed core mold abut against the locking ring 2 and the oil groove tail ring 5, respectively. The inner ribbed core mold is detachably connected to the active conical core mold 4.

[0055] The outer surface of the passive rib core mold 3 is provided with rib grooves 3-1, and the rib grooves 3-1 on the outer surface of the inner rib core mold together form a honeycomb grid groove structure.

[0056] like Figures 2-4 The inner surface of the passive ribbed core mold 3 is connected to the outer surface of the active conical core mold 4 through a dovetail structure.

[0057] Furthermore, multiple active conical core molds 4 are arranged around the conical central axis 6, and the multiple active conical core molds 4 together constitute a cylindrical structure, on which the inner rib core mold is sleeved;

[0058] The inner surface of the passive ribbed core mold 3 is a first arc surface 3-3, and the outer surface of the active conical core mold 4 is a second arc surface 4-2. The first arc surface 3-3 and the second arc surface 4-2 fit and adapt to each other.

[0059] Two symmetrically distributed half-width dovetail grooves 3-2 are provided on the first arc surface 3-3. The half-width dovetail grooves 3-2 on opposite sides of the two adjacent passive rib groove core molds 3 in the circumferential direction together form a dovetail groove structure. A dovetail 4-1 is provided on the second arc surface 4-2. The dovetail 4-1 is on the dovetail groove structure, so that the active conical core mold 4 and the passive rib groove core mold 3 fit tightly without gaps.

[0060] Both the active conical core mold 4 and the passive rib groove core mold 3 are arc-shaped. The passive rib groove core mold 3 has a first side surface 3-7 and a second side surface 3-8 on both sides, and the first side surfaces 3-7 and 3-8 of two adjacent passive rib groove core molds 3 are in contact. The half-width dovetail groove 3-2 is a structure of half of the dovetail groove after it is evenly divided with an inclined angle. The first arc surface 3-3 has the same structural dimensions as the second arc surface 4-2 in the active conical core mold 4. The intersection line of the extended planes of the first side surface 3-7 and the second side surface 3-8 coincides with the axis of the first arc surface 3-3, and the included angle θ between the first side surface 3-7 and the second side surface 3-8 is 360° / n.

[0061] Furthermore, one end of the passive rib groove core mold 3 is provided with an oil guide countersink 3-6, and the other end is fixedly connected to an oil guide boss 3-5. The oil guide boss 3-5 and the oil guide countersink 3-6 are connected through a through hole 3-4. On the axis of the conical central shaft 6, the oil guide bosses 3-5 and oil guide countersinks 3-6 of two adjacent passive rib groove core molds 3 are inserted into each other, thereby realizing that multiple passive rib groove core molds 3 on the axis are connected end to end in sequence.

[0062] Furthermore, the locking ring 2 abuts against one end of the inner rib core mold, and the locking ring 2 is provided with a positioning hole 2-1 that matches the oil guide boss 3-5. The oil guide boss 3-5 of the passive rib core mold 3 located at the end is inserted into the corresponding positioning hole 2-1.

[0063] The oil groove tail ring 5 abuts against the other end of the inner rib core mold, and the oil groove tail ring 5 is provided with an arc-shaped oil groove 5-1; the end faces of the two circumferentially adjacent passive rib core molds 3 located at the end fit against the arc-shaped oil groove 5-1 to form an oil return chamber; the oil guide holes 3-6 of the two circumferentially adjacent passive rib core molds 3 are respectively located at both ends of the arc-shaped oil groove 5-1 and connect to the oil return chamber, thereby forming a connected "U"-shaped oil path on the axis.

[0064] In practical implementation, two adjacent oil guide protrusions 3-5 extending from the locking ring 2 can be connected through connecting pipes, thereby forming a structure where the multiple external oil guide protrusions 3-5 are connected end to end, serving as a connection in the middle of the oil circuit. The oil guide protrusions 3-5 at both ends are connected to the inlet oil pipe and the return oil pipe, respectively. Cooling oil enters from the oil guide protrusion 3-5 at the inlet end and passes sequentially along the axis through the through holes 3-4 of the multiple axially oriented passive rib groove core molds 3. Then, the cooling oil is output from the through hole 3-4 of the end passive rib groove core mold 3 into the arc-shaped oil groove 5-1. The cooling oil then passes through... The arc-shaped oil groove 5-1 enters the through hole 3-4 of the adjacent passive rib groove core mold 3, and then passes through the through holes 3-4 of the adjacent passive rib groove core mold 3 in multiple axial directions along another adjacent axis. Then, it enters the through hole 3-4 on another axis through the oil guide boss 3-5 at the end and the connecting pipe. The cycle continues until the cooled oil after heat absorption is output from the oil guide boss 3-5 at the oil outlet end and enters the return oil pipe. After cooling, it enters the inlet oil pipe again, thus forming a structure of multiple "U"-shaped oil circuits connected in series, and finally realizing the function of cooling circulation.

[0065] The oil guiding boss 3-5 is a hollow cylindrical structure, and the through hole 3-4 penetrates the passive rib groove core mold 3 along the axis of the second arc surface 4-2; the oil guiding countersunk hole 3-6 is a countersunk hole structure symmetrical to the side of the oil guiding boss 3-5, the inner diameter of the oil guiding countersunk hole 3-6 is the same as the outer diameter of the oil guiding boss 3-5, and the center of the oil guiding countersunk hole 3-6 is the same through hole 3-4 as the oil guiding boss 3-5.

[0066] The locking ring 2 includes n (n = 2, 4, ...) positioning holes 2-1, a central hole 2-2, and a locking ring dovetail groove 2-3. The n positioning holes 2-1 are evenly distributed around the circumference of the central hole 2-2, and their size is slightly larger than the outer diameter of the oil guide boss 3-4. The number of positioning holes 2-1 is the same as the number of through holes 3-4. The size of the central hole 2-2 is slightly larger than the outer diameter of the tapered central shaft 6, and the central hole 2-2 allows the tapered central shaft 6 to pass through. The locking ring dovetail groove 2-3 is an inwardly recessed groove structure with an inclined angle. The symmetrical center line of the locking ring dovetail groove 2-3 is deflected by 360° / 2n relative to the line connecting the center of the through hole and the axis of rotation.

[0067] The oil groove tail ring 5 includes an arc-shaped oil groove 5-1, an oil groove tail ring dovetail groove 5-2, and a third arc surface 5-3; the axis of the arc-shaped oil groove 5-1 coincides with the axes of the first arc surface 3-3, the second arc surface 4-2, and the third arc surface 5-3, and the beginning and end of the arc-shaped oil groove 5-1 are respectively provided with two adjacent passive rib groove core molds 3 with oil guide holes 3-6, and the number of arc-shaped oil grooves 5-1 is n / 2 (n=2,4,…); the structure and size of the oil groove tail ring dovetail groove 5-2 are the same as the end-to-end combination structure of the half-width dovetail groove 3-2, and the oil groove tail ring dovetail groove 5-2 is for the dovetail 4-1 to be embedded; the size of the third arc surface 5-3 is the same as the size of the first arc surface 3-3 and the second arc surface 4-2.

[0068] The tapered central shaft 6 includes a shaft end 6-1, a tapered shaft 6-2, and a threaded shaft 6-3. The side of the shaft end 6-1 abuts against the end face of the oil groove tail ring 5 opposite to the arc-shaped oil groove 5-1. The taper of the tapered shaft 6-2 is the same as the taper of the tapered arc surface 4-3, and the length of the tapered shaft 6-2 is slightly less than the length of the tapered arc surface 4-3. The thread size of the threaded shaft 6-3 is the same as that of the locking nut 1. The threaded shaft 6-3 passes through the central hole 2-2 and is locked to the locking ring 2 by the locking nut 1. The end of the tapered central shaft 6 away from the threaded shaft 6-3 is "T"-shaped, and its "T"-shaped structure abuts against the oil groove tail ring 5. The oil groove tail ring 5 and the locking ring 2 together lock the inner core mold.

[0069] Furthermore, the rib groove 3-1 is a regular polygon, and the four sides of the passive rib groove core mold 3 are provided with the opening groove of the rib groove 3-1, so that the rib grooves 3-1 of the multiple passive rib groove core molds 3 in the axial and circumferential directions together form a connected honeycomb grid groove structure.

[0070] The rib groove 3-1 is a composite structure consisting of one or more of the following: transverse ribs, longitudinal ribs, and spiral ribs.

[0071] A design method for a combined temperature-controlled spinning mandrel with ribs and grooves, applied to the aforementioned combined temperature-controlled spinning mandrel device, includes the following steps:

[0072] Step 1: Design the circumferential unfolding structure of the rib grooves on the surface of the complex internal rib core mold: The surface of the internal rib core mold is composed of several regular polygonal rib grooves 3-1 arranged periodically. Each regular polygonal rib groove 3-1 consists of k equal-length ribs connected end to end. Adjacent rib grooves 3-1 overlap on one side, forming a honeycomb grid groove structure. The honeycomb grid groove structure is evenly divided into passive rib groove core molds 3. Each passive rib groove core mold 3 includes one complete regular polygonal rib groove 3-1 and four 1 / 4 regular polygonal grooves. The four 1 / 4 regular polygonal grooves are located at the four corners of the passive rib groove core mold 3, and the rib groove 3-1 is located at the center of the passive rib groove core mold 3.

[0073] Where k ≥ 4, and k is an even number;

[0074] Step 2: Determine the dimensions of the passive rib groove core mold 3: Using the division method from Step 1, the honeycomb mesh groove structure is divided into n parts along the circumferential direction. The included angle between the boundaries of adjacent passive rib groove core molds 3 satisfies Formula 1:

[0075]

[0076] In the formula, n is the number of circumferential passive rib groove core molds, satisfying n≥2 and n is an even number;

[0077] The arc length and width of the passive rib groove core mold 3 are the distances between the geometric center points of the four 1 / 4 regular polygon rib grooves in the circumferential and axial directions, respectively.

[0078] For the regular quadrilateral rib groove 3-1:

[0079]

[0080] For the rhomboid groove 3-1:

[0081]

[0082] For the horizontally placed regular hexagonal rib groove 3-1:

[0083]

[0084] For the longitudinally placed regular hexagonal rib groove 3-1:

[0085]

[0086] For the regular octagonal rib groove 3-1:

[0087]

[0088] In the formula, R is the outer diameter of the passive rib groove core mold 3, and t is the width of the rib groove; the dimensions of other regular polygonal structures are calculated sequentially.

[0089] Step 3: Determine the dimensions of the active conical core mold 4: Design the dimensions of the dovetail 4-1 based on the dimensions of the dovetail groove structure formed by the passive rib groove core mold 3, leaving gaps in the height and width directions to ensure smooth assembly and disassembly of the core mold; the dimensions of the second arc surface 4-2 are the same as those of the first arc surface 3-3. After the dovetail 4-1 is installed, the two arc surfaces abut each other with gaps to ensure smooth assembly and disassembly; the active conical core mold 4 has a conical shaft with a draft angle α on the surface opposite to the arc surface; the length of the active conical core mold 4 is the sum of the widths of the oil groove tail ring 5, the locking ring 2, and the i passive rib groove core molds 3;

[0090] Step 4: Determine the number of passive rib groove core molds 3 and active conical core molds 4: The number of passive rib groove core molds 3 per unit width in the axial direction is the same as the number of active conical core molds 4, which is n, and the number is even; the number of passive rib groove core molds 3 along the X-axis is n×i, i=1,2,3…; and the total width of the passive rib groove core molds is the sum of the unit widths of i passive rib groove core molds 3;

[0091] Step 5: Verification of the rationality of mold size design: There are no gaps between the rib structure ring group composed of several passive rib core molds 3 in the circumferential direction; the oil guide boss 3-5 and the oil guide countersunk hole 3-6 are installed without error; the dovetails 4-1 of several active conical core molds 4 in the circumferential direction can smoothly pass through the half-width dovetail groove 3-2 and the dovetail grooves of the oil groove tail ring 5 and the locking ring 2; after the passive rib core mold 3 and the active conical core mold 4 are assembled, the outer surface of the whole is cylindrical; the conical central shaft 6 fits against the conical surface of the active conical core mold 4 and is secured by the locking nut 1; after installation, there is no axial slippage of each component.

[0092] After installation, the outer surface of the mandrel is fitted with a cylindrical blank. High-temperature heat-conducting oil is introduced into the oil circuit. The adjacent oil circuits of the passive ribbed mandrel form a "U-shaped" oil circuit, with oil inlet and outlet at both ends. After the ribs of the passive ribbed mandrel reach the set temperature, they are spun. The tube blank completes the rib filling process under the action of spinning.

[0093] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, substitutions, or variations made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A combined temperature-controlled spinning mandrel device with ribbed grooves, characterized in that, It includes a locking nut (1), a locking ring (2), a passive rib groove core mold (3), an active conical core mold (4), an oil groove tail ring (5), and a conical central shaft (6); The locking ring (2) and the oil groove tail ring (5) are sleeved on the conical central shaft (6). One end of the conical central shaft (6) is threaded to the locking nut (1), and the locking nut (1) abuts against the locking ring (2). The active conical core mold (4) is provided between the oil groove tail ring (5) and the locking ring (2). The active conical core mold (4) is sleeved on the conical central shaft (6). Multiple passive ribbed core molds (3) together form a ring-shaped ribbed structure ring group. This ribbed structure ring group is sleeved on the active conical core mold (4), and multiple ribbed structure ring groups are arranged on the axis of the conical central shaft (6). The multiple ribbed structure ring groups together constitute the inner ribbed core mold of the cylindrical structure. On the axis and circumferential direction of the conical central shaft (6), two adjacent passive ribbed core molds (3) abut without gap. The two ends of the inner ribbed core mold abut against the locking ring (2) and the oil groove tail ring (5) respectively. The inner ribbed core mold is detachably connected to the active conical core mold (4). The passive rib core mold (3) has rib grooves (3-1) on its outer surface, and the rib grooves (3-1) on the outer surface of the inner rib core mold together form a honeycomb grid groove structure. The inner surface of the passive ribbed core mold (3) is connected to the outer surface of the active conical core mold (4) through a dovetail structure.

2. The combined temperature-controlled spinning mandrel device with ribbed grooves according to claim 1, characterized in that, Multiple active conical core molds (4) are arranged around the conical central axis (6), and the multiple active conical core molds (4) together constitute a cylindrical structure, on which the inner rib core mold is fitted. The inner side of the passive rib groove core mold (3) is a first arc surface (3-3), and the outer side of the active conical core mold (4) is a second arc surface (4-2). The first arc surface (3-3) and the second arc surface (4-2) fit and adapt to each other. Two symmetrically distributed half-width dovetail grooves (3-2) are provided on the first arc surface (3-3). The half-width dovetail grooves (3-2) on opposite sides of two adjacent passive rib groove core molds (3) in the circumferential direction together form a dovetail groove structure. A dovetail (4-1) is provided on the second arc surface (4-2). The dovetail (4-1) is on the dovetail groove structure, so that the active conical core mold (4) and the passive rib groove core mold (3) fit tightly without gaps.

3. The combined temperature-controlled spinning mandrel device with ribbed grooves according to claim 2, characterized in that, One end of the passive rib groove core mold (3) is provided with an oil guide countersink (3-6), and the other end is fixedly connected to an oil guide boss (3-5). The oil guide boss (3-5) and the oil guide countersink (3-6) are connected by a through hole (3-4). On the axis of the conical central shaft (6), the oil guide bosses (3-5) and oil guide countersinks (3-6) of two adjacent passive rib groove core molds (3) are inserted into each other, so as to realize that multiple passive rib groove core molds (3) on the axis are connected end to end in sequence.

4. The combined temperature-controlled spinning mandrel device with ribbed grooves according to claim 3, characterized in that, The locking ring (2) abuts against one end of the inner rib core mold. The locking ring (2) is provided with a positioning hole (2-1) that matches the oil guide boss (3-5). The oil guide boss (3-5) of the passive rib core mold (3) located at the end is inserted into the corresponding positioning hole (2-1). The oil groove tail ring (5) abuts against the other end of the inner rib core mold, and the oil groove tail ring (5) is provided with an arc-shaped oil groove (5-1); the end faces of the two circumferentially adjacent passive rib core molds (3) located at the end fit against the arc-shaped oil groove (5-1) to form an oil return chamber; the oil guide holes (3-6) of the two circumferentially adjacent passive rib core molds (3) are located at both ends of the arc-shaped oil groove (5-1) and connect to the oil return chamber, thereby forming a connected "U"-shaped oil path on the axis.

5. A combined temperature-controlled spinning mandrel device with ribbed grooves according to any one of claims 1-4, characterized in that, The rib groove (3-1) is a regular polygon, and the four sides of the passive rib groove core mold (3) are provided with the opening groove of the rib groove (3-1), so that the rib grooves (3-1) of multiple passive rib groove core molds (3) in the axial and circumferential directions together form a connected honeycomb grid groove structure.

6. A design method for a combined temperature-controlled spinning mandrel with ribs and grooves, applied to the combined temperature-controlled spinning mandrel device with ribs and grooves as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Design the circumferential unfolding structure of the rib grooves on the surface of the complex inner rib core mold: The surface of the inner rib core mold is formed by a periodic arrangement of several regular polygonal rib grooves (3-1). Each regular polygonal rib groove (3-1) includes k sides, and k equal-length ribs are connected end to end to form a rib groove unit. Adjacent rib grooves (3-1) overlap on one side to form a honeycomb grid groove structure. The honeycomb grid groove structure is evenly divided into passive rib groove core molds (3). Each passive rib groove core mold (3) includes a complete regular polygonal rib groove (3-1) and 4 1 / 4 regular polygonal grooves. The 4 1 / 4 regular polygonal grooves are located at the four corners of the passive rib groove core mold (3), and the rib groove (3-1) is located at the center of the passive rib groove core mold (3). Where k ≥ 4, and k is an even number; Step 2: Determine the dimensions of the passive rib groove core mold (3): Using the division method of Step 1, the honeycomb grid groove structure is divided into n parts along the circumferential direction, and the included angle of the boundary of adjacent passive rib groove core molds (3) satisfies formula (1): In the formula, n is the number of circumferential passive rib groove core molds (3), which satisfies n≥2 and n is an even number; The arc length and width of the passive rib groove core mold (3) are the distances between the geometric center points of the four 1 / 4 regular polygon rib grooves in the circumferential and axial directions, respectively. For the square rib groove (3-1): For the rhomboid groove (3-1): For the horizontally placed regular hexagonal rib groove (3-1): For the vertically placed regular hexagonal rib groove (3-1): For the regular octagonal rib groove (3-1): In the formula, R is the outer diameter of the passive rib groove core mold (3), and t is the width of the rib groove; the other regular polygonal structure dimensions are calculated in sequence. Step 3: Determine the dimensions of the active conical core mold (4): Design the dimensions of the dovetail (4-1) based on the dimensions of the dovetail groove structure formed by the passive rib groove core mold (3), leaving gaps in the height and width directions to ensure smooth assembly and disassembly of the core mold; the dimensions of the second arc surface (4-2) are the same as those of the first arc surface (3-3). After the dovetail (4-1) is installed, the two arc surfaces abut and have gaps to ensure smooth assembly and disassembly; the active conical core mold (4) has a conical shaft with a draft angle α on the surface opposite to the arc surface; the length of the active conical core mold (4) is the sum of the widths of the oil groove tail top ring (5), the locking ring (2), and the i passive rib groove core molds (3); Step 4: Determine the number of passive rib groove core molds (3) and active conical core molds (4): The number of passive rib groove core molds (3) per unit width in the axial direction is the same as the number of active conical core molds (4), which is n, and the number is even; the number of passive rib groove core molds (3) along the X-axis axial direction is n×i, i=1,2,3…; and the total width of the passive rib groove core molds is the sum of the unit widths of i passive rib groove core molds (3); Step 5: Verification of the rationality of mold size design: There is no gap between the rib structure ring group composed of several passive rib core molds (3) in the circumferential direction, and the oil guide boss (3-5) and oil guide countersunk hole (3-6) are installed without error; the dovetail (4-1) of several active conical core molds (4) in the circumferential direction can smoothly pass through the half-width dovetail groove (3-2) and the dovetail groove of the oil groove tail top ring (5) and locking ring (2); after the passive rib core mold (3) and active conical core mold (4) are assembled, the outer surface of the community is cylindrical; the conical central shaft (6) fits the conical surface of the active conical core mold (4) and is secured by the locking nut (1); after installation, there is no axial slippage of each component.

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