Integrated rheoforming device for manufacturing high-quality titanium casting

Abstract

The invention discloses an integrated rheoforming device for manufacturing a high-quality titanium casting, and relates to the technical field of investment precision casting, the integrated rheoforming device comprises a mold component, a forming mold and a runner mechanism arranged at the top of the forming mold; and the supporting component comprises a bottom plate, a supporting column arranged at the top of the bottom plate and an adjusting sleeve arranged at the top of the supporting column. The position of the mold component is finely adjusted through the adjusting sleeve on the supporting component and other parts, so that the crucible is aligned with the runner mechanism, loss caused by inaccurate pouring is reduced, when molten metal is poured, the distance between the support structure and the whole runner mechanism is adjusted, the auxiliary flow pipe rotates, and therefore the molten metal is poured more accurately. The flow-in angle of metal liquid poured into the forming die is close to the horizontal direction, the pouring angle is slowly close to the horizontal direction, convection is reduced as much as possible in the pouring process, and the forming quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of investment casting, in particular to an integrated rheological forming device for manufacturing high-quality titanium castings. Background Art

[0002] Since titanium alloy has high specific strength, that is, at the same weight, titanium alloy can provide higher strength, ensure lightweight, and have the advantages of wear resistance and corrosion resistance, so titanium alloy is usually used to cast golf heads. When casting golf heads, a vacuum shell furnace is usually used. This equipment uses the melting conditions of a vacuum arc furnace to control the amount of cooling water to form a layer of "shell" in the crucible wall of the molten metal. The advantage of a vacuum shell furnace is that it can be melted and cast in a vacuum environment, which helps to reduce the oxidation and other chemical reactions of titanium alloys at high temperatures, thereby improving the quality and performance of castings. In addition, the vacuum shell furnace can also form a larger molten pool, which helps to quickly tilt the crucible at the end of melting to inject the molten metal into the mold for solidification, which is very beneficial for casting golf heads with complex shapes.

[0003] However, when casting is carried out in a vacuum shell furnace, the mold is inside the furnace, and it is inconvenient to adjust the position of the mold inside the furnace. Therefore, when the molten metal in the crucible is accurately poured into the mold shell, there will be inaccurate pouring of the molten metal, resulting in loss. At the same time, since the golf head mold is deep, pouring the molten metal from the top of the mold will cause upper and lower convection. The convection of the molten metal will cause defects such as pores, shrinkage and inclusions inside the casting, affecting the quality of the casting. Summary of the invention

[0004] The object of the present invention is to provide an integrated rheological forming device for manufacturing high-quality titanium castings to solve at least one technical problem existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an integrated rheological forming device for manufacturing high-quality titanium castings, comprising a mold component, including a forming mold and a flow channel mechanism arranged on the top of the forming mold; and,

[0006] A supporting member, comprising a bottom plate, a supporting column arranged on the top of the bottom plate, and an adjusting sleeve arranged on the top of the supporting column;

[0007] Wherein, the flow channel mechanism includes a guide tube, the end of the guide tube is provided with an elliptical interface, the inner wall of the elliptical interface is provided with an inner interface, the inner interface cooperates with the elliptical interface, and the side of the inner interface is connected to the guide tube.

[0008] Preferably, a connecting rod is provided on the side of the forming mold, and a guide wheel is provided on the side of the connecting rod.

[0009] Preferably, a casting port is provided at the top of the runner mechanism, the casting port is connected to the runner mechanism, the runner mechanism is divided into multiple sections, a support structure is provided on the side of the runner mechanism, a steel cable is provided at the bottom of the support structure, and the top of the steel cable is in contact with the guide wheel.

[0010] Preferably, a sliding column is provided at the bottom of the support structure, a positioning ring is provided on the outer wall of the sliding column, an elastic member is provided at the bottom of the positioning ring, and the bottom of the elastic member is connected to the side of the connecting rod.

[0011] Preferably, a rotating frame is provided at the bottom of the guide tube, an auxiliary flow tube is provided on the side of the rotating frame, the top of the auxiliary flow tube is connected to the guide tube, the bottom of the auxiliary flow tube is connected to the forming mold, the auxiliary flow tube is communicated with the guide tube, and the auxiliary flow tube is communicated with the forming mold.

[0012] Preferably, the support structure comprises a sliding frame, an outer wall of the sliding frame is provided with a sliding groove, a side of the sliding frame is provided with a fixing frame, a side of the fixing frame is provided with a sliding key, and the sliding key is sleeved in the sliding groove.

[0013] Preferably, an adjusting cross bar is arranged inside the adjusting sleeve, one end of the adjusting cross bar away from the adjusting sleeve is connected to the connecting rod, and a through groove is provided on the side surface of the adjusting sleeve.

[0014] Preferably, a positioning block is provided on the top of the adjusting sleeve, a threaded rod is provided on the inner wall of the positioning block, a sliding block is provided at one end of the threaded rod, and a receiving groove is provided at the bottom of the sliding block.

[0015] Preferably, the sliding block is sleeved on the side surface of the adjusting sleeve, the sliding block can slide in the through groove, a clamping block is arranged inside the sliding block, and a switching block is arranged at the bottom of the clamping block.

[0016] Preferably, a sliding rod is provided inside the sliding block, one end of the sliding rod is connected to the steel cable, a locking tooth is provided on a side surface of the clamping block, and a clamping groove is provided on a side surface of the adjusting cross bar.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When casting a golf head, if the pouring of molten metal is inaccurate, the position of the mold component can be fine-tuned through the adjustment sleeve on the supporting component and other parts to align the crucible with the runner mechanism, thereby reducing the loss caused by inaccurate pouring. On the other hand, with the complexity of the shape of the golf head, it is often necessary to replace the mold when casting the golf head. The runner mechanism is composed of multiple sections of guide tubes, which can move relatively to each other. The shape of the runner mechanism and the radius of curvature formed by it can be adjusted to adapt to molds of various models and sizes, making it more convenient to change the mold.

[0019] 2. The present invention adjusts the distance between the support structure and the entire flow channel mechanism to allow the auxiliary flow tube to rotate. When pouring molten metal, the inflow angle of the molten metal poured into the forming mold is made close to the horizontal direction, and the pouring angle is slowly made close to the horizontal direction, thereby minimizing the generation of convection during the pouring process and improving the forming quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the mold component of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the flow channel mechanism of the present invention and a partial enlarged schematic diagram thereof;

[0023] Figure 4 It is a structural schematic diagram of the support member of the present invention and a partial enlarged schematic diagram thereof;

[0024] Figure 5 For the present invention Figure 4 A side view of a partial enlarged view in the middle;

[0025] Figure 6 For the present invention Figure 5 Sectional view along AA.

[0026] In the figure: 1. mold component; 2. supporting component; 11. molding mold; 12. connecting rod; 13. guide wheel; 14. runner mechanism; 15. casting port; 16. bracket structure; 17. steel cable; 18. slide column; 19. positioning ring; 110. elastic member; 141. guide tube; 142. elliptical interface; 143. inner interface; 144. rotating frame; 145. auxiliary flow tube; 161. sliding frame; 162. sliding groove; 163. fixed frame; 164. sliding key; 21. bottom plate; 22. supporting column; 23. adjusting sleeve; 24. positioning block; 25. adjusting cross bar; 26. through groove; 27. threaded rod; 28. sliding block; 29. ​​clamping block; 210. switching block; 211. sliding rod; 212. clamping tooth; 213. clamping groove. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] For example, see Figures 1 to 6 The present invention provides a technical solution: an integrated rheological forming device for manufacturing high-quality titanium castings, comprising a mold component 1, comprising a forming mold 11 and a runner mechanism 14 arranged on the top of the forming mold 11, wherein the titanium alloy molten metal is cast in the forming mold 11 to form a golf head shape, the runner mechanism 14 is located on the top of the forming mold 11 and is connected to the forming mold 11, the runner mechanism 14 is on the outside of the top of the forming mold 11, and surrounds the forming mold 11 from the side of the forming mold 11 with a larger curvature, the runner mechanism 14 is a structure composed of multiple sections of flow guides, and the multiple sections of flow channels are used to pour the molten metal into the forming mold from the top, which can ensure the uniformity of the poured molten metal as much as possible while ensuring the density of the casting product; and,

[0029] The support member 2 includes a bottom plate 21, a support column 22 disposed on the top of the bottom plate 21, and an adjustment sleeve 23 disposed on the top of the support column 22. The support column 22 and the bottom plate 21 are placed outside the vacuum shell furnace to support the mold member 1 and the runner mechanism 14 in the furnace for casting and molding. The adjustment sleeve 23 can fine-tune the position of the mold outside the furnace, adjust the mold position at any time, and ensure that the poured metal liquid can accurately enter the runner mechanism 14 and then enter the mold for molding during casting, thereby reducing losses.

[0030] Among them, the flow channel mechanism 14 includes a guide tube 141, an elliptical interface 142 is provided at the end of the guide tube 141, an inner interface 143 is provided on the inner wall of the elliptical interface 142, the inner interface 143 cooperates with the elliptical interface 142, and the side of the inner interface 143 is connected to the guide tube 141. The flow channel mechanism 14 is composed of multiple sections of guide tubes 141, and the two ends of the guide tube 141 between the two sections of the guide tube 141 are simultaneously provided with an elliptical interface 142 and an inner interface 143. Since the guide tubes 141 at both ends of the flow channel mechanism 14 are connected to the supporting structure, only one of the elliptical interface 142 and the inner interface 143 is provided. The inner interface 143 can slide and rotate slightly in the elliptical interface 142, so the shape of the flow channel mechanism 14 and the radius of curvature it encloses can be adjusted to adapt to molds of various models and sizes.

[0031] During operation, the support member 2 is arranged on the outside of the vacuum shell furnace, and the mold member 1 extends into the furnace. The molten metal in the crucible is poured into the runner mechanism 14. The runner mechanism 14 is divided into multiple sections to pour the molten metal into the mold from the top of the mold and wait for it to be formed. When the pouring of the molten metal is inaccurate, the position of the mold member 1 can be fine-tuned through the adjustment sleeve 23 and other parts on the support member 2 to align the crucible with the runner mechanism 14, thereby reducing the loss caused by inaccurate pouring. On the other hand, with the complexity of the ball head shape, it is often necessary to replace the mold when casting the golf ball head, and the runner mechanism 14 is composed of multiple sections of guide tubes 141, which can move relative to each other, and the shape of the runner mechanism 14 and the radius of curvature formed by them can be adjusted to adapt to molds of various models and sizes, making it more convenient to change the mold.

[0032] Embodiment 2 improves the process of fine-tuning the position of the mold component 1 by adjusting the adjustment sleeve 23 on the support component 2 and other parts when the pouring of the molten metal is inaccurate on the basis of embodiment 1. The specific method can be referred to in Figures 1 to 6 ;

[0033] like Figure 2 As shown, a connecting rod 12 is provided on the side of the forming mold 11, a guide wheel 13 is provided on the side of the connecting rod 12, a casting port 15 is provided on the top of the runner mechanism 14, the casting port 15 is connected with the runner mechanism 14, when pouring molten metal, the molten metal enters the runner mechanism 14 from the casting port 15, the runner mechanism 14 is divided into multiple sections, a support structure 16 is provided on the side of the runner mechanism 14, the support structure 16 supports the runner mechanism 14 at the side to help it maintain a correct posture during the casting process, a steel cable 17 is provided at the bottom of the support structure 16, the top of the steel cable 17 is in contact with the guide wheel 13, the steel cable 17 is always in contact with the guide wheel 13, and an inflection point is formed at the guide wheel 13.

[0034] A sliding column 18 is provided at the bottom of the support structure 16, and a positioning ring 19 is provided on the outer wall of the sliding column 18. The bottom of the sliding column 18 is sleeved on the inner wall of the connecting rod 12, and the sliding column 18 can slide up and down above the connecting rod 12. An elastic member 110 is provided at the bottom of the positioning ring 19, and the bottom of the elastic member 110 is connected to the side of the connecting rod 12, and the elastic member 110 is in a compressed state.

[0035] like Figure 4As shown, an adjusting cross bar 25 is provided inside the adjusting sleeve 23, and one end of the adjusting cross bar 25 away from the adjusting sleeve 23 is connected to the connecting rod 12, and the adjusting cross bar 25 can slide on the inner wall of the adjusting sleeve 23, and when sliding, it will drive the connecting rod 12 and the entire mold component 1 to slide together, and a through groove 26 is provided on the side of the adjusting sleeve 23, and a positioning block 24 is provided on the top of the adjusting sleeve 23, and a threaded rod 27 is provided on the inner wall of the positioning block 24, and a sliding block 28 is provided at one end of the threaded rod 27, and a receiving groove is provided at the bottom of the sliding block 28, and the sliding block 28 is sleeved on the side of the adjusting sleeve 23, and the sliding block 28 can slide in the through groove 26, and the threaded rod 27 is threadedly connected with the positioning block 24, and the threaded rod 27 is rotated, and the threaded rod 27 is rotated, and the threaded rod 27 will slide on the positioning block 24, and at the same time drive the sliding block 28 to slide, and a clamping block 29 is provided inside the sliding block 28 The block 29 can slide inside the sliding block 28, and a switching block 210 is provided at the bottom of the block 29, and the switching block 210 is fixedly connected to the block 29. A sliding rod 211 is provided inside the sliding block 28, and one end of the sliding rod 211 is connected to the steel cable 17. A locking tooth 212 is provided on the side of the block 29, and a slot 213 is provided on the side of the adjusting cross bar 25. The block 29 is located between the sliding rod 211 and the slot 213 inside the sliding block 28. By pulling the switching block 210 in the direction of the sliding rod 211, the block 29 can be pressed against the sliding rod 211, and the block 29 and the inner wall of the sliding block 28 move and clamp the sliding rod 211. At this time, rotating the threaded rod 27 drives the sliding block 28 to slide, which will drive the sliding rod 211 to slide together, and pulling the switching block 210 in the direction of the adjusting cross bar 25, the block 29 will slide into the slot 213 on the side of the adjusting cross bar 25 and be connected with the adjusting cross bar 25.

[0036] When the mold position needs to be fine-tuned, when the switching block 210 is slid toward the adjusting cross bar 25, the card block 29 will slide into the card slot 213. At this time, the card block 29 connects the sliding block 28 with the adjusting cross bar 25. Rotating the threaded rod 27 to drive the sliding block 28 to slide will drive the adjusting cross bar 25 to slide together, thereby driving the entire mold component 1 to slide together, so as to adjust the position of the mold and align it with the position of pouring the molten metal into the crucible to reduce loss.

[0037] Embodiment 3, based on the above embodiment, further describes the process of adjusting the angle of the runner mechanism 14 for pouring molten metal during the casting process to reduce the convection phenomenon generated during the pouring process and improve the quality of the casting. The specific method is as follows:

[0038] like Figure 3As shown, a rotating rack 144 is provided at the bottom of the guide tube 141, and an auxiliary flow tube 145 is provided on the side of the rotating rack 144. The top of the auxiliary flow tube 145 is connected to the guide tube 141, and the bottom of the auxiliary flow tube 145 is connected to the forming mold 11. The top of the auxiliary flow tube 145 is sleeved on the bottom of the guide tube 141, and the auxiliary flow tube 145 can slide and rotate slightly inside the guide tube 141. The bottom of the auxiliary flow tube 145 is sleeved on the top of the forming mold, and the auxiliary flow tube 145 can slide and rotate slightly inside the forming mold. The auxiliary flow tube 145 is connected to the guide tube 141, and the auxiliary flow tube 145 is connected to the forming mold. When casting a golf head in a metal solidification furnace, the molten metal in the crucible enters the guide tube 141 from the casting port 15, and the molten metal in each section of the guide tube 141 is poured into the mold from the auxiliary flow channel. The mold has a certain depth, and the molten metal that enters the mold later will impact the existing molten metal in the mold, thereby forming convection. The closer the inflow angle of the molten metal that enters later is to vertical, the stronger the convection will be. However, if the pouring is done at an angle close to horizontal, the pouring process will be slowed down and the flow channel will be easily blocked. Therefore, when pouring molten metal, it is best to make the pouring angle slowly approach the horizontal to minimize the impact and slow down the convection. Therefore, when pouring molten metal, move the switching block 210 in the direction of the slide bar 211 to push the block 29 against the slide bar 211. The block 29 and the inner wall of the slide block 28 move to clamp the slide bar 211. At this time, rotate the threaded rod 27 to drive the slide block 28 to slide away from the inside of the furnace, which will drive the slide bar 211 away from the center of the furnace, thereby driving the steel cable 17 to slide.

[0039] like Figures 2 to 3 As shown, the support structure 16 includes a sliding frame 161, the outer wall of the sliding frame 161 is provided with a sliding groove 162, the side of the sliding frame 161 is provided with a fixing frame 163, the side of the fixing frame 163 is provided with a sliding key 164, the sliding key 164 is sleeved in the sliding groove 162, the sliding key 164 can slide in the sliding groove 162, and cooperate when the size of the flow channel mechanism 14 is adjusted, the side of the fixing frame 163 away from the sliding key 164 is fixedly connected to the sliding column 18, the bottom of the fixing frame 163 is fixedly connected to the steel cable 17, and the fixing frame 163 The bottom and the rotating threaded rod 27 drive the sliding block 28 to slide away from the interior of the furnace, thereby driving the steel cable 17 to slide. The sliding of the steel cable 17 will drive the steering of the guide wheel to apply a downward sliding force to the fixed frame 163, thereby driving the support structure 16 and the entire flow channel mechanism 14 to approach the forming mold. The vertical distance between the flow channel mechanism 14 and the forming mold will become smaller. At this time, the auxiliary flow pipe 145 will rotate, so that the inflow angle of the metal liquid poured into the forming mold approaches the horizontal direction, and the pouring angle slowly approaches the horizontal.

[0040] During operation, when pouring molten metal, the switching block 210 is pushed in the direction of the slide bar 211, so that the clamping block 29 can be pressed against the slide bar 211, and the clamping block 29 and the inner wall of the slide block 28 move to clamp the slide bar 211. At this time, the threaded rod 27 is rotated to drive the slide block 28 to slide away from the inside of the furnace, which will drive the slide bar 211 away from the center of the furnace, thereby driving the steel cable 17 to slide, driving the support structure 16 and the entire runner mechanism 14 to approach the forming mold, and the vertical distance between the runner mechanism 14 and the forming mold is The distance will become smaller, and the auxiliary flow tube 145 will rotate at this time, so that the inflow angle of the metal liquid poured into the forming mold approaches the horizontal direction, and the pouring angle is slowly made close to the horizontal, so as to minimize the generation of convection during the pouring process and improve the molding quality. When the pouring is completed, the switching block 210 is moved in the direction of the adjusting cross bar 25 to drive the card block 29 away from the sliding bar 211. At this time, under the action of the elastic member 110, the bracket structure 16 will slide upward to drive the flow channel mechanism 14 to reset together for the next casting.

[0041] At the same time, when it is necessary to adjust the size of the flow channel mechanism 14 to adapt to the mold change, the flow channel mechanism 14 is removed from the molding mold, the auxiliary flow channel is separated from the molding mold 11, and the guide tubes 141 can move relative to each other, so that the shape of the flow channel mechanism 14 and the curvature radius thereof can be adjusted. At the same time, the sliding frame 161 and the fixed frame 163 can also move relative to each other, so that the auxiliary flow channel can adapt to the new molding mold 11 and then be inserted into the molding mold 11 to complete the mold change.

[0042] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated rheological forming device for manufacturing high-quality titanium castings, characterized in that: include: A mold component (1) comprises a molding mold (11) and a flow channel mechanism (14) arranged on the top of the molding mold (11); as well as, A supporting member (2) comprising a base plate (21), a supporting column (22) arranged on the top of the base plate (21), and an adjusting sleeve (23) arranged on the top of the supporting column (22); The flow channel mechanism (14) comprises a flow guide tube (141), an elliptical interface (142) is provided at the end of the flow guide tube (141), an inner interface (143) is provided on the inner wall of the elliptical interface (142), the inner interface (143) cooperates with the elliptical interface (142), and the side surface of the inner interface (143) is connected to the flow guide tube (141).

2. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 1, characterized in that: A connecting rod (12) is arranged on the side of the forming mold (11), and a guide wheel (13) is arranged on the side of the connecting rod (12).

3. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 2, characterized in that: The top of the runner mechanism (14) is provided with a casting port (15), the casting port (15) is connected to the runner mechanism (14), the runner mechanism (14) is divided into multiple sections, a support structure (16) is provided on the side of the runner mechanism (14), a steel cable (17) is provided at the bottom of the support structure (16), and the top of the steel cable (17) is in contact with the guide wheel (13).

4. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 3 is characterized in that: A sliding column (18) is provided at the bottom of the support structure (16), a positioning ring (19) is provided on the outer wall of the sliding column (18), an elastic member (110) is provided at the bottom of the positioning ring (19), and the bottom of the elastic member (110) is connected to the side of the connecting rod (12).

5. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 4, characterized in that: A rotating frame (144) is arranged at the bottom of the flow guide tube (141), an auxiliary flow tube (145) is arranged on the side of the rotating frame (144), the top of the auxiliary flow tube (145) is connected to the flow guide tube (141), the bottom of the auxiliary flow tube (145) is connected to the molding die (11), the auxiliary flow tube (145) is in communication with the flow guide tube (141), and the auxiliary flow tube (145) is in communication with the molding die (11).

6. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 5, characterized in that: The support structure (16) comprises a sliding frame (161), the outer wall of the sliding frame (161) is provided with a sliding groove (162), a fixed frame (163) is arranged on the side of the sliding frame (161), a sliding key (164) is arranged on the side of the fixed frame (163), and the sliding key (164) is sleeved in the sliding groove (162).

7. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 6, characterized in that: An adjusting cross bar (25) is arranged inside the adjusting sleeve (23), one end of the adjusting cross bar (25) away from the adjusting sleeve (23) is connected to the connecting rod (12), and a through groove (26) is provided on the side of the adjusting sleeve (23).

8. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 7, characterized in that: A positioning block (24) is arranged at the top of the adjusting sleeve (23), a threaded rod (27) is arranged on the inner wall of the positioning block (24), a sliding block (28) is arranged at one end of the threaded rod (27), and a receiving groove is arranged at the bottom of the sliding block (28).

9. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 8, characterized in that: The sliding block (28) is sleeved on the side of the adjusting sleeve (23), and the sliding block (28) can slide in the through groove (26). A clamping block (29) is arranged inside the sliding block (28), and a switching block (210) is arranged at the bottom of the clamping block (29).

10. The integrated rheological forming device for manufacturing high-quality titanium castings according to claim 9, characterized in that: A sliding rod (211) is arranged inside the sliding block (28), one end of the sliding rod (211) is connected to the steel cable (17), a side surface of the clamping block (29) is provided with a clamping tooth (212), and a side surface of the adjusting cross bar (25) is provided with a clamping groove (213).

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