CN112387847A

CN112387847A - Stamping process for alloy plate of power distribution cabinet

Info

Publication number: CN112387847A
Application number: CN202011155214.8A
Authority: CN
Inventors: 陈烨; 周勇; 周建
Original assignee: Jiangsu Jianxiong Electric Co ltd
Current assignee: Jiangsu Jianxiong Electric Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-02-23

Abstract

The invention relates to a stamping processing technology for alloy plates of a power distribution cabinet, which uses integrated processing equipment, and the equipment comprises a support frame, a blanking device, a stamping device, a base and a material receiving box, wherein the lower end of the support frame is arranged on the ground, the middle part of the upper side of the support frame is provided with the blanking device, the stamping device is arranged in the support frame, the lower end of the stamping device is connected with the base, the base is arranged on the ground, and the material receiving box is arranged on the left side and the right side. The blanking device can push the cut blanking out of the cutting head through the cutting head of the blanking device, so that the blanking falls into the material receiving box through the blanking hole, and the blanking is prevented from being clamped in the cutting head, thereby influencing secondary cutting; be provided with in the punching press head through stamping device and support the angle piece, when the secondary punching press, support the angle piece and support the pressure to the interior turning of shaping iron sheet to guarantee that the interior turning of shaping iron sheet is the right angle.

Description

Stamping process for alloy plate of power distribution cabinet

Technical Field

The invention relates to the technical field of processing of alloy plates of power distribution cabinets, in particular to a stamping processing technology of alloy plates of power distribution cabinets.

Background

The power distribution cabinet is divided into a power distribution cabinet, a lighting distribution cabinet and a metering cabinet, and is the final-stage equipment of a power distribution system, the power distribution cabinet is a general name of a motor control center, and the power distribution cabinet is used in occasions with dispersed loads and less loops; the motor control center is used for the occasions with concentrated loads and more loops. They distribute the power of a circuit of a higher level of power distribution equipment to nearby loads, which provide protection, monitoring and control of the loads.

The top cover of the power distribution cabinet is cut and punched, but the following problems exist in the cutting and punching process:

(1) in the process of blanking the alloy sheet, because the front end of the blanking head is of a hollow structure, the blanking material under blanking can be clamped in the blanking head under the stamping force of blanking, thereby influencing secondary blanking.

(2) In the process of stamping the alloy plate, the corner of the stamped alloy plate is likely to have a springback phenomenon, so that the corner is in a circular arc shape instead of a right angle after being formed.

In order to solve the problems, the invention provides a stamping process for alloy plates of a power distribution cabinet.

Disclosure of Invention

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose: the utility model provides a switch board alloy plate stamping process technology, its has used an integration processing equipment, and this equipment includes support frame, blanking device, stamping device, base and receipts workbin, and the support frame lower extreme is installed subaerial, and support frame upside mid-mounting has blanking device, the inside stamping device that is provided with of support frame, and stamping device's lower extreme is connected with the base, and the pedestal mounting is subaerial, and the receipts workbin has all been placed to the base left and right sides, wherein:

the process for stamping the alloy plate of the power distribution cabinet by using the integrated processing equipment comprises the following steps;

step one, equipment inspection, namely starting the integrated processing equipment to inspect the running condition of the integrated processing equipment so that the integrated processing equipment can work normally;

step two, preparing operation, namely placing the alloy plate to be processed into integrated processing equipment, and adjusting the position of the plate;

step three, performing processing, namely cutting the alloy plate into a specified size through a blanking device on the integrated processing equipment, and then performing stamping processing on the cut alloy plate through a stamping device;

step four, checking and collecting, namely taking the processed alloy plate out of the integrated processing equipment, detecting whether the size of the alloy plate meets the requirement, and uniformly collecting and stacking qualified products;

the supporting frame comprises a left side plate, a right side plate and a top plate, the lower ends of the left side plate and the right side plate are both arranged on the ground, the upper end of the left side plate is connected with the left side of the lower end face of the top plate, and the upper end of the right side plate is connected with the right side of the lower end face of the top plate;

the blanking device comprises an Contraband-shaped frame, an intermittent motor, a connecting shaft, a driving gear, a transmission internal gear, a connecting rod and a cutting mechanism; an Contraband-shaped frame is arranged on the upper end surface of the top plate at a position close to the left side of the rear end, a Contraband-shaped frame is provided with a downward opening, 21274, an intermittent motor is arranged on the inner wall of the upper end of the shaped frame, an output shaft of the intermittent motor is connected with a connecting shaft, a driving gear is fixedly sleeved on the outer wall of the lower side of the connecting shaft, the driving gear is in meshing transmission with a transmission inner gear, connecting rods are arranged on the upper end surface of the transmission inner gear at equal intervals along the circumferential direction of the transmission inner gear, an annular groove is formed in the lower end surface of the top plate; the concrete during operation, the mechanism that tailors starts the back, the mechanism that tailors one of them turning of iron sheet, after the mechanism that tailors one of them turning and accomplishes, the intermittent type motor starts, the output shaft of intermittent type motor passes through the connecting axle and drives the driving gear rotation, the driving gear meshes the transmission with transmission internal gear, transmission internal gear rotates and drives the connecting rod and slide in the ring channel, the driving gear rotates the round and drives transmission internal gear rotation quarter round, transmission internal gear rotation quarter round drives the mechanism that tailors and removes to opposite side corner, thereby tailor the corner of iron sheet in proper order.

Stamping device includes the mould, limit baffle, the mounting bracket, punching press cylinder and punching press head, roof up end mid-mounting has the mounting bracket, the mounting bracket is opening decurrent \21274, the shape structure, punching press cylinder is installed to mounting bracket upper end inner wall, the through-hole has been seted up to the roof up end and the corresponding position of punching press cylinder, the outer wall of punching press cylinder stiff end is connected with the through-hole inner wall, punching press cylinder's flexible end is connected with the punching press overhead end, punching press head below is provided with the mould, limit baffle is installed near the outer wall position to the mould up end, the punching press groove has been seted up with the first corresponding position of punching press to the mould up end, the mould up end is close to the turning position and has all been seted up and tailorred the. When the iron sheet is cut by the cutting device, the stamping cylinder is started, the telescopic end of the stamping cylinder drives the stamping head to move downwards to press the alloy plate into the stamping groove, the alloy plate is stamped into the shape of the stamping groove by stamping force, secondary stamping is carried out, and the shape of the alloy plate is prevented from rebounding by the secondary stamping.

Preferably, the inner diameter of the transmission internal gear is four times of the outer diameter of the driving gear.

Preferably, the cutting mechanism comprises a fixed block, a cutting cylinder, a cutting head, a connecting plate, a reset spring, a sliding plate and a rubber block, the upper end of the fixed block is arranged on the lower end face of the transmission inner gear, a rectangular groove is formed in the middle of the lower end face of the fixed block, the telescopic end of the cutting cylinder for cutting the cutting cylinder is arranged in the rectangular groove and connected with the cutting head, the connecting plate is arranged on the inner wall of the lower side of the cutting head, the reset spring is arranged at the equal distance of the lower end face of the connecting plate, the lower end of the reset spring is connected with the upper end face of the sliding plate, the outer wall. The cylinder starts during concrete work, cuts out the flexible end drive of cutting the head and moves down of cutting the cylinder, cuts out alloy sheet material corner, and the blanking under cutting is extruded reset spring through the sliding plate at the in-process blanking of cutting out, cuts out the back when the blanking, and reset spring drives the sliding plate and promotes the blanking outside cutting the head, makes it fall into in receiving the workbin through the blanking hole, prevents that the blanking card from cutting out in the head to the influence secondary is cut out.

Preferably, the size of the blanking hole is larger than that of the cutting groove, so that the blanking is prevented from being blocked in the blanking hole and failing to fall due to the change of the falling angle in the falling process.

Preferably, the punching press head is including promoting cylinder, the propelling ball, the sliding ball, the slide bar, expanding spring and corner piece supports, the mounting groove has been seted up at punching press head upper end middle part, mounting groove upside inner wall is connected with the propelling cylinder stiff end outer wall, the flexible end of propelling cylinder is connected with the propelling ball, circular slot and sliding hole have been seted up to the mounting groove below, the sliding hole is seted up for the slope, the circular slot, mounting groove and sliding hole intercommunication, all be provided with the slide bar through the sliding fit mode in the sliding hole, the sliding ball is installed to the one end that the slide bar is close to the circular slot, be connected through expanding spring between the sliding ball, the slide bar other end is connected with and supports the corner piece, it is three toper to support the corner piece, the. When the stamping device performs secondary stamping, the pushing cylinder is started, the telescopic end of the pushing cylinder drives the pushing ball to move downwards, and when the pushing ball is attached to the outer wall of the sliding ball, the sliding ball drives the sliding rod to move from the center to the outer side in the sliding hole, so that the corner block is driven to move outwards of the sliding hole, the inner corner of the formed alloy plate is pressed, and the inner corner of the formed alloy plate is guaranteed to be a right angle.

The invention has the beneficial effects that:

1. the blanking device can push the cut blanking out of the cutting head through the cutting head of the blanking device, so that the blanking falls into the material receiving box through the blanking hole, and the blanking is prevented from being clamped in the cutting head, thereby influencing secondary cutting; be provided with in the punching press head through stamping device and support the angle piece, when the secondary punching press, support the angle piece and support the pressure to the interior turning of shaping alloy panel to guarantee that the interior turning of shaping alloy panel is the right angle.

2. According to the blanking device, the cutting cylinder of the blanking device drives the cutting head to move downwards to cut the corners of alloy plates, when the blanking is cut, the reset spring is extruded by the sliding plate in the cutting process, and when the blanking is cut, the reset spring drives the sliding plate to push the blanking outwards of the cutting head, so that the blanking falls into the material receiving box through the blanking hole, and the blanking is prevented from being clamped in the cutting head, so that secondary cutting is influenced.

3. According to the stamping device, the pushing cylinder of the stamping device drives the pushing ball to move downwards, when the pushing ball is attached to the outer wall of the sliding ball, the sliding ball drives the sliding rod to move from the center to the outer side in the sliding hole, so that the corner supporting block is driven to move outwards of the sliding hole, the inner corner of the formed alloy plate is supported and pressed, and the inner corner of the formed alloy plate is guaranteed to be a right angle.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a flow chart of the operation of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a front sectional view of the present invention;

FIG. 4 is a sectional view taken along line A-A of FIG. 3 of the present invention;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4 in accordance with the present invention;

FIG. 6 is a cross-sectional view taken along line C-C of FIG. 4 of the present invention;

FIG. 7 is a cross-sectional view taken along line D-D of FIG. 4 in accordance with the present invention;

FIG. 8 is an enlarged fragmentary view at E of FIG. 4 of the present invention;

FIG. 9 is an enlarged fragmentary view at F of FIG. 3 of the present invention;

FIG. 10 is a top cross-sectional view of a punch block of the present invention;

figure 11 is a view of an angle block of the present invention.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 1 to 11, a switch board alloy plate stamping process technology, it has used an integration processing equipment, this equipment includes support frame 1, blanking device 2, stamping device 3, base 4 and receipts workbin 5, the installation of 1 lower extreme of support frame is subaerial, the 1 upside mid-mounting of support frame has blanking equipment, 1 inside stamping device 3 that is provided with of support frame, stamping device 3's lower extreme is connected with base 4, base 4 installs subaerial, receipts workbin 5 has all been placed to the 4 left and right sides of base, wherein:

step three, performing processing, namely cutting the alloy plate into a specified size through a blanking device 2 on the integrated processing equipment, and then performing stamping processing on the cut alloy plate through a stamping device 3;

the supporting frame 1 comprises a left side plate 11, a right side plate 12 and a top plate 13, the lower ends of the left side plate 11 and the right side plate 12 are both arranged on the ground, the upper end of the left side plate 11 is connected with the left side of the lower end face of the top plate 13, and the upper end of the right side plate 12 is connected with the right side of the lower end face of the top plate 13;

the blanking device 2 comprises an Contraband-shaped frame 21, an intermittent motor 22, a connecting shaft 23, a driving gear 24, a transmission internal gear 25, a connecting rod 26 and a cutting mechanism 27; an Contraband-shaped frame 21 is arranged at a position, close to the left side of the rear end, of the upper end face of the top plate 13, the Contraband-shaped frame 21 is provided with a downward opening, an intermittent motor 22 is arranged on the inner wall of the upper end of the Contraband-shaped frame 21, an output shaft of the intermittent motor 22 is connected with a connecting shaft 23, a driving gear 24 is fixedly sleeved on the outer wall of the lower side of the connecting shaft 23, the driving gear 24 is in meshing transmission with a transmission internal gear 25, connecting rods 26 are arranged on the upper end face of the transmission internal gear 25 at equal intervals along the circumferential direction of the upper end face, an annular groove is formed in the lower end face of the top plate 13; during specific work, after the cutting mechanism starts, the cutting mechanism cuts one of the corners of the iron sheet, after the cutting mechanism cuts one of the corners, the intermittent motor 22 starts, the output shaft of the intermittent motor 22 drives the driving gear 24 to rotate through the connecting shaft 23, the driving gear 24 is in meshing transmission with the transmission internal gear 25, the transmission internal gear 25 rotates to drive the connecting rod 26 to slide in the annular groove, the driving gear 24 rotates a circle to drive the transmission internal gear 25 to rotate a quarter circle, the transmission internal gear 25 rotates a quarter circle to drive the cutting mechanism 27 to move to the corner of the other side, and therefore the corner of the iron sheet is cut in sequence.

The stamping device 3 comprises a die 31 and a limit baffle 32, mounting bracket 33, punching press cylinder 34 and punching press head 35, mounting bracket 33 is installed to roof 13 up end mid-mounting, mounting bracket 33 is the downward 21274of opening, the shape structure, punching press cylinder 34 is installed to mounting bracket 33 upper end inner wall, the through-hole has been seted up with punching press cylinder 34 corresponding position to roof 13 up end, the outer wall and the through-hole inner wall of punching press cylinder 34 stiff end are connected, punching press cylinder 34's flexible end is connected with punching press head 35 upper end, punching press head 35 below is provided with mould 31, mould 31 up end is close to outer wall position and installs limit baffle 32, punching press groove 35a has been seted up with punching press head 35 corresponding position to mould 31 up end, cutting groove 31b has all been seted up to mould 31 up end near corner position, blanking hole 31a communicates with each other. When the iron sheet cutting device works, after the iron sheet cutting device finishes cutting the iron sheet, the stamping cylinder 34 is started, the telescopic end of the stamping cylinder 34 drives the stamping head 35 to move downwards to press the alloy sheet into the stamping groove 35a, the alloy sheet is stamped into the shape of the stamping groove 35a through stamping force, secondary stamping is conducted, and the shape of the alloy sheet is prevented from rebounding through the secondary stamping.

The internal diameter of the internal gear 25 is four times the external diameter of the pinion gear 24.

The cutting mechanism 27 comprises a fixing block 271, a cutting cylinder 272, a cutting head 273, a connecting plate 274, a return spring 275, a sliding plate 276 and a rubber block 277, the upper end of the fixing block 271 is installed on the lower end face of the transmission internal gear 25, the middle of the lower end face of the fixing block 271 is provided with a rectangular groove, the telescopic end of the cutting cylinder 272 provided with the cutting cylinder is connected with the cutting head 273, the connecting plate 274 is installed on the inner wall of the lower side of the cutting head 273, the return spring 275 is installed on the lower end face of the connecting plate 274 at equal intervals, the lower end of the return spring 275 is connected with the upper end face of the sliding plate 276, the outer wall of the sliding plate 276 is installed on the inner. During specific work, cutting cylinder 272 starts, and cutting cylinder 272's flexible end drives cutting head 273 downstream, cuts alloy sheet corner, and the blanking under cutting extrudes reset spring 275 through sliding plate 276 at the blanking of cutting in-process, and after the blanking was cut off, reset spring 275 drove sliding plate 276 and pushed the blanking to cutting head 273 outward, makes it fall into through blanking hole 31a and receives workbin 5, prevents that the blanking card from cutting in head 273 to influence the secondary and cut.

The size of the blanking hole 31a is larger than that of the cutting groove 31b, so that the phenomenon that blanking cannot fall down due to the fact that the blanking is clamped in the blanking hole 31a due to the change of the falling angle in the falling process is avoided.

The punching press head 35 is including promoting cylinder 351, promote ball 352, sliding ball 353, slide bar 354, expanding spring 355 and support corner block 356, the mounting groove has been seted up at punching press head 35 upper end middle part, mounting groove upside inner wall is connected with promotion cylinder 351 stiff end outer wall, the flexible end of promotion cylinder 351 is connected with promotion ball 352, circular slot and sliding hole have been seted up to the mounting groove below, the sliding hole is seted up for the slope, the circular slot, mounting groove and sliding hole intercommunication, all be provided with sliding bar 354 through the sliding fit mode in the sliding hole, sliding ball 353 is installed to the one end that sliding bar 354 is close to the circular slot, be connected through expanding spring 355 between the sliding ball 353, the sliding bar 354 other end is connected with and supports corner block 356, it is the triangle-cone to support corner block 356, the tight end that supports of triangle-. When the punching device 3 performs secondary punching, the pushing cylinder 351 is started, the telescopic end of the pushing cylinder 351 drives the pushing ball 352 to move downwards, and when the pushing ball 352 is attached to the outer wall of the sliding ball 353, the sliding ball 353 drives the sliding rod 354 to move outwards from the center in the sliding hole, so that the corner supporting block 356 is driven to move outwards from the sliding hole, the inner corner of the formed alloy plate is supported and pressed, and the inner corner of the formed alloy plate is guaranteed to be a right angle.

The integrated processing equipment comprises the following use steps in work:

the first step is as follows: manually placing an alloy plate on a die, cutting one corner of an iron sheet by a cutting mechanism, driving a driving gear 24 to rotate by an output shaft of an intermittent motor 22 through a connecting shaft 23 after the cutting mechanism cuts one corner, meshing transmission is carried out on the driving gear 24 and a transmission internal gear 25, the transmission internal gear 25 rotates to drive a connecting rod 26 to slide in an annular groove, the driving gear 24 rotates for one circle to drive the transmission internal gear 25 to rotate for one quarter circle, and the transmission internal gear 25 rotates for one quarter circle to drive the cutting mechanism 27 to move to the corner at the other side, so that the corners of the iron sheet are sequentially cut;

the second step is that: after the cutting device finishes cutting the iron sheet, the telescopic end of the stamping cylinder 34 drives the stamping head 35 to move downwards to press the alloy plate into the stamping groove 35a, and the alloy plate is stamped into the shape of the stamping groove 35a by stamping force and then is stamped for the second time;

the third step: when the punching device 3 performs secondary punching, the telescopic end of the pushing cylinder 351 drives the pushing ball 352 to move downwards, and when the pushing ball 352 is attached to the outer wall of the sliding ball 353, the sliding ball 353 drives the sliding rod 354 to move from the center to the outer side in the sliding hole, so that the corner supporting block 356 is driven to move outwards of the sliding hole, and the inner corner of the formed alloy plate is supported and pressed.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as hereinafter claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a switch board alloy plate stamping process technology, its has used an integration processing equipment, and this equipment includes support frame (1), blanking device (2), stamping device (3), base (4) and receipts workbin (5), its characterized in that: the lower end of a support frame (1) is arranged on the ground, blanking equipment is arranged in the middle of the upper side of the support frame (1), a stamping device (3) is arranged in the support frame (1), the lower end of the stamping device (3) is connected with a base (4), the base (4) is arranged on the ground, and material receiving boxes (5) are arranged on the left side and the right side of the base (4);

step three, performing processing, namely cutting the alloy plate into a specified size through a blanking device (2) on the integrated processing equipment, and then performing stamping processing on the cut alloy plate through a stamping device (3);

the supporting frame (1) comprises a left side plate (11), a right side plate (12) and a top plate (13), the lower ends of the left side plate (11) and the right side plate (12) are both installed on the ground, the upper end of the left side plate (11) is connected with the left side of the lower end face of the top plate (13), and the upper end of the right side plate (12) is connected with the right side of the lower end face of the top plate (13);

the blanking device (2) comprises an Contraband-shaped frame (21), an intermittent motor (22), a connecting shaft (23), a driving gear (24), a transmission internal gear (25), a connecting rod (26) and a cutting mechanism (27); an Contraband-shaped frame (21) and a 21274are mounted at a position, close to the left side of the rear end, of the upper end face of the top plate (13), the shaped frame (21) is provided with a downward opening, an intermittent motor (22) is mounted on the inner wall of the upper end of the Contraband-shaped frame (21), an output shaft of the intermittent motor (22) is connected with a connecting shaft (23), a driving gear (24) is fixedly sleeved on the outer wall of the lower side of the connecting shaft (23), the driving gear (24) is in meshing transmission with a transmission internal gear (25), connecting rods (26) are mounted on the upper end face of the transmission internal gear (25) at equal intervals along the circumferential direction of the upper end face, an annular groove is formed in the lower end face of the top plate (13), the upper end of each connecting rod;

the punching device (3) comprises a die (31), a limit baffle (32), an installation frame (33), a punching cylinder (34) and a punching head (35), the middle part of the upper end surface of a top plate (13) is provided with the installation frame (33), the installation frame (33) is of a shape structure with a downward opening of 21274, the inner wall of the upper end of the installation frame (33) is provided with the punching cylinder (34), the upper end surface of the top plate (13) is provided with a through hole at a position corresponding to the punching cylinder (34), the outer wall of the fixed end of the punching cylinder (34) is connected with the inner wall of the through hole, the telescopic end of the punching cylinder (34) is connected with the upper end of the punching head (35), the die (31) is arranged below the punching head (35), the limit baffle (32) is arranged at a position, which is close to the outer wall, of the upper end surface of the die (31) is provided with a punching groove (35a), blanking holes (31a) are formed in the upper end face of the die (31) and close to the corners, and the blanking holes (31a) are communicated with the cutting grooves (31 b).

2. The stamping process for alloy plates of power distribution cabinets according to claim 1, characterized in that: the inner diameter of the transmission internal gear (25) is four times of the outer diameter of the driving gear (24).

3. The stamping process for alloy plates of power distribution cabinets according to claim 1, characterized in that: the cutting mechanism (27) comprises a fixing block (271), a cutting cylinder (272), a cutting head (273), a connecting plate (274), a return spring (275), a sliding plate (276) and a rubber block (277), the upper end of the fixing block (271) is installed on the lower end face of the transmission internal gear (25), a rectangular groove is formed in the middle of the lower end face of the fixing block (271), the telescopic end of the cutting cylinder (272) installed in the rectangular groove is connected with the cutting head (273), the connecting plate (274) is installed on the inner wall of the lower side of the cutting head (273), the return spring (275) is installed at the equal distance of the lower end face of the connecting plate (274), the lower end of the return spring (275) is connected with the upper end face of the sliding plate (276), the outer wall of the sliding plate (276) is installed on the inner wall of the cutting head (273) in a sliding.

4. The stamping process for alloy plates of power distribution cabinets according to claim 1, characterized in that: the size of the blanking hole (31a) is larger than that of the cutting groove (31 b).

5. The stamping process for alloy plates of power distribution cabinets according to claim 1, characterized in that: the punching head (35) comprises a pushing cylinder (351), a pushing ball (352), a sliding ball (353), a sliding rod (354), an expansion spring (355) and an angle abutting block (356), punching press head (35) upper end middle part has been seted up the mounting groove, mounting groove upside inner wall is connected with promotion cylinder (351) stiff end outer wall, it is connected with propelling ball (352) to promote cylinder (351) flexible end, circular slot and sliding hole have been seted up to the mounting groove below, the sliding hole is seted up for the slope, the circular slot, mounting groove and sliding hole intercommunication, all be provided with slide bar (354) through the sliding fit mode in the sliding hole, slide bar (354) are close to the one end in circular slot and install slide ball (353), be connected through expanding spring (355) between slide ball (353), slide bar (354) other end is connected with supports hornblock (356), it is three angular cones to support hornblock (356), the tight end that supports of three angular cones is the right angle.