CN114101485A

CN114101485A - Adjustable bending die

Info

Publication number: CN114101485A
Application number: CN202110909466.3A
Authority: CN
Inventors: 张达; 冯志勇; 徐立金
Original assignee: Ningbo Yumin Machine Industrial Co ltd
Current assignee: Ningbo Yumin Machine Industrial Co ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2022-03-01

Abstract

The invention discloses an adjustable bending die, which comprises: the mould frame comprises a fixed support and an upper mould plate which is positioned above the fixed support and is driven by a power device to lift; the pressurizing device is positioned below the upper template and comprises a plurality of height adjusting mechanisms which are distributed in parallel along the length direction of the upper template, a forming block arranged below the height adjusting mechanisms and a supporting piece used for connecting the upper template and the height adjusting mechanisms, and the height adjusting mechanisms are used for adjusting the lifting of the forming block; the bearing transmission device comprises a plurality of sliding fixed blocks, and an elastic component is arranged between each sliding fixed block and the fixed support; the mould, including last mould and with last mould complex lower mould, go up the mould and locate the shaping piece below, the lower mould is located the slip fixed block. The adjustable bending die is adopted, and the radian of the die can be adjusted according to the requirements of products.

Description

Adjustable bending die

Technical Field

The invention relates to the field of dies, in particular to an adjustable bending die.

Background

The mould that is used for processing product bending in the existing market has the unicity, can't adjust the radian according to the product demand. Is only suitable for processing a single product. When the radian of the product is changed, the die needs to be milled or replaced, so that the bending forming process is complex and the cost is increased. For example, chinese patent publication No. CN109622763A, entitled "a mold for bending and forming connecting rods of automobile pedals" includes an upper mold, a lower mold, and a hydraulic device. The lower die is fixedly arranged on a hydraulic table top of hydraulic equipment and comprises a lower die plate, a bent female seat is fixedly arranged on the right side of the lower die plate and used for fixing a workpiece, the upper die and a descending table of the hydraulic equipment are fixed, the upper die comprises an upper die plate, a bent male seat is fixedly arranged below the upper die plate, and the bent male seat and the bent female seat are matched and correspond to each other. The disadvantages of the prior patents are: the radian of the bending die is fixed, and when the radian of a product is changed, the die needs to be milled, so that the operation is troublesome and the cost is high.

Disclosure of Invention

The invention aims to overcome the problem that the radian of a die cannot be adjusted according to the radian of a product, and provides an adjustable bending die which can adjust the radian of the die according to the requirement of the product.

In order to achieve the purpose, the invention adopts the following technical scheme:

an adjustable bending die comprising:

the mould frame comprises a fixed support and an upper mould plate which is positioned above the fixed support and is driven by a power device to lift;

the pressurizing device is positioned below the upper template and comprises a plurality of height adjusting mechanisms which are distributed in parallel along the length direction of the upper template, a forming block arranged below the height adjusting mechanisms and a supporting piece used for connecting the upper template and the height adjusting mechanisms, and the height adjusting mechanisms are used for adjusting the lifting of the forming block;

the bearing transmission device comprises a plurality of sliding fixed blocks, and an elastic component is arranged between each sliding fixed block and the fixed support;

the mould, including last mould and with last mould complex lower mould, go up the mould and locate the shaping piece below, the lower mould is located the slip fixed block.

The height of the forming blocks is adjusted through the height adjusting mechanism, the forming blocks are arranged at equal intervals, and the lower ends of the forming blocks are adjusted to form different radians. The pressing device presses down on the die, and the die is bent to obtain the required radian.

The sliding fixing block is provided with a mounting groove for mounting a lower die, when the die is bent, the sliding fixing block moves downwards along with the elastic assembly under the action of pressure, and after the upper die and the lower die are closed and then continuously move downwards to reach a certain forming limit peak value, the required radian is obtained through bending forming.

As preferred, height adjusting mechanism includes that the regulation rotation axis, the cover that follow cope match-plate pattern width direction parallel arrangement establish the last bevel gear on the regulation rotation axis, with regulation rotation axis vertically adjusting screw axle, cover establish adjusting screw epaxial end and with last bevel gear meshing's lower bevel gear, with the connecting block that becomes the shape piece and be used for connecting the first guide arm of shaping piece and connecting block, be equipped with vertical through-hole on the connecting block, be equipped with the internal thread on the vertical through-hole, internal thread and adjusting screw axle cooperation, the connecting block cover is established at the adjusting screw epaxially. And rotating the adjusting rotating shaft, wherein the adjusting rotating shaft drives the upper bevel gear to rotate, the upper bevel gear drives the lower bevel gear to rotate, and the lower bevel gear drives the adjusting screw shaft to rotate. Become the shaping piece and connect into a whole through first guide arm with the connecting block, become the shaping piece and set up on support piece with the connecting block, the connecting block reciprocates along the adjusting screw shaft through the internal thread, the connecting block drives the shaping piece and reciprocates, the height of shaping piece is adjusted to this design adopts bevel gear transmission and screw rod driven mode to change into the radian that shaping piece lower extreme formed and adjust the radian of mould production product, moreover, the steam generator is simple in structure and stable, and the regulation precision is high, improve the precision of the required radian of product.

Preferably, the support piece comprises two vertically arranged fixed support plates, a first connecting plate and a second connecting plate, wherein the fixed support plates are just opposite to each other in distribution, the first connecting plate and the second connecting plate are arranged between the two fixed support plates in parallel, a through hole is formed in the first connecting plate, the adjusting screw shaft penetrates through the first connecting plate, a through hole is formed in the second connecting plate, the first guide rod penetrates through the second connecting plate, and the connecting block is located between the first connecting plate and the second connecting plate. The support piece is used for connecting the height adjusting mechanism and the upper template, and the first connecting plate and the second connecting plate are used for guiding the height adjusting mechanism, so that the connecting block can only move up and down along the adjusting screw shaft under the action of the first guide rod and the adjusting screw shaft.

Preferably, the elastic assembly comprises a lower die rotating shaft rotatably arranged on the fixed support, a nitrogen spring arranged on the lower die rotating shaft, and a nitrogen spring fixing seat used for fixing the nitrogen spring, the upper end of a piston rod of the nitrogen spring is connected with a sliding fixing block, and the sliding fixing block moves along the stretching direction of the nitrogen spring. The nitrogen spring is used for pressing, forming and bending, and the sliding fixing block moves along a piston rod of the nitrogen spring. The lower die rotating shaft rotates and is arranged on the fixed support, the lower die rotating shaft is provided with the resetting mechanism, and when the die is pressed and bent, the lower die rotating shaft drives the bearing transmission device to rotate, so that the sliding fixed block is attached to the lower die, the production precision is improved, and the damage of the edge of the sliding fixed block to the lower die is reduced.

Preferably, a guide plate is arranged on the nitrogen spring fixing seat, two vertical through holes are formed in the guide plate, second guide rods which correspond to the through holes one to one are arranged below the sliding fixing block, the second guide rods penetrate through the through holes, and guide sleeves penetrate through the through holes. The second guide rod is used for limiting the sliding fixing block, so that deflection is not easy to generate between the sliding fixing block and the nitrogen spring.

Preferably, the lower extreme of adjusting screw shaft is equipped with the stopper, and the epaxial cover of adjusting screw is equipped with the axle sleeve, and the adjusting screw shaft passes through the bushing with first connecting plate, the upper portion of the lateral wall of axle sleeve is equipped with spacing boss for with the adjusting screw shaft spacing on first connecting plate. The limiting block of the lower end of the adjusting screw shaft is used for limiting the connecting block on the adjusting screw shaft, and the adjusting screw shaft is connected with the first connecting plate through the shaft sleeve, so that the adjusting screw shaft cannot damage the threads of the adjusting screw shaft and the through hole of the first connecting plate in rotation.

Preferably, the adjusting rotating shaft is sleeved with a shaft sleeve, the adjusting rotating shaft is connected with the fixed supporting plate through the shaft sleeve, a limiting boss is arranged at one end, facing the outer side of the fixed supporting plate, of the shaft sleeve, the limiting boss is used for limiting the adjusting rotating shaft between the fixed supporting plate, an adjusting knob is sleeved at one end, extending out of the outer side of the fixed supporting plate, of the adjusting rotating shaft, and the shaft sleeve is located between the fixed supporting plate and the adjusting knob.

Preferably, a vertical guide column is arranged between the fixed support and the upper template, and the upper end of the vertical guide column is connected with the upper template. Under the driving action of the power device, the upper template moves up and down along the vertical guide post.

Preferably, the sliding fixing block is provided with an adjusting cushion block, one side, close to the lower die, of the lower end of the adjusting cushion block is provided with a limiting boss, the sliding fixing block is provided with a limiting groove corresponding to the limiting boss and used for limiting the adjusting cushion block on the sliding fixing block, and the adjusting cushion block screws the lower die tightly through an adjusting bolt. Different adjusting gaskets can be adapted to different lower dies, so that the lower dies are stably installed on the sliding fixing blocks.

Preferably, the lower end face of the shaping block is an outer cylindrical face, the axis of the outer cylindrical face is parallel to the upper template, and the lower edge of the pressurizing device consists of the outer cylindrical faces of the shaping blocks which are arranged in sequence. The precision of the bending processing of the product is improved.

Therefore, the invention has the following beneficial effects: the radian of the die can be adjusted according to the requirements of products.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a left side view of the present invention.

Fig. 3 is a plan view of the lower mold, the lower mold fixing block, the elastic assembly and the fixing bracket of the present invention.

Fig. 4 is a schematic view of a height adjusting mechanism according to the present invention.

Fig. 5 is a schematic structural diagram of the bearing transmission device of the invention.

As shown in the figure: a fixed bracket 1, an upper template 2,

A height adjusting mechanism 3, an adjusting rotating shaft 3.1, an upper bevel gear 3.2, an adjusting screw shaft 3.3, a lower bevel gear 3.4, a connecting block 3.5, a first guide rod 3.6, a vertical through hole 3.7, a limiting block 3.8, a shaft sleeve 3.9, a limiting boss 3.10,

A forming block 4,

A support member 5, a fixed support plate 5.1, a first connecting plate 5.2, a second connecting plate 5.3,

A sliding fixed block 6,

An elastic component 7, a lower die rotating shaft 7.1, a nitrogen spring 7.2, a nitrogen spring fixing seat 7.3, a guide plate 7.4, a second guide rail 7.5, a guide sleeve 7.6,

The device comprises an upper die 8, a lower die 9, an adjusting knob 10, a vertical guide column 11 and an adjusting cushion block 12.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention is further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1, 2, 3, 4, 5, an adjustable bending die comprises:

the mould frame comprises a fixed support 1 and an upper mould plate 2 which is positioned above the fixed support 1 and is driven by a power device to lift;

the pressurizing device is positioned below the upper template 2 and comprises a plurality of height adjusting mechanisms 3 which are distributed in parallel along the length direction of the upper template 2, a forming block 4 arranged below the height adjusting mechanisms 3 and a supporting piece 5 for connecting the upper template 2 and the height adjusting mechanisms 3, and the height adjusting mechanisms 3 are used for adjusting the lifting of the forming blocks 4;

the bearing transmission device comprises a plurality of sliding fixed blocks 6, and an elastic component 7 is arranged between each sliding fixed block 6 and the fixed support 1;

the mould comprises an upper mould 8 and a lower mould 9 matched with the upper mould 8, wherein the upper mould 8 is arranged below the forming block 4, and the lower mould 9 is positioned on the sliding fixing block 6.

The height of the forming blocks 4 is adjusted through the height adjusting mechanism 3, the forming blocks 4 are arranged at equal intervals, and the lower ends of the forming blocks 4 are adjusted to form different radians. The pressing device presses down on the die, and the die is bent to obtain the required radian.

The sliding fixing block 6 is provided with a mounting groove for mounting the lower die 9, when the die is bent, the sliding fixing block 6 moves downwards along with the elastic component 7 under the action of pressure, and after the upper die 9 is closed and continues to move downwards to reach a certain forming limit peak value, the die is bent and formed to obtain the required radian.

The radian that the above-mentioned embodiment formed through the height that adjusts the shaping piece 4 to change pressure device lower extreme, and hydraulic press pressure testing is selected on cope match-plate pattern 2 to this embodiment, adjusts the required radian of product to the high adjustment mechanism 3 among the pressure device, and it is fixed to have solved the mould radian of bending, and when the product radian changes, need the milling die, troublesome poeration and problem with high costs.

As shown in fig. 2 and 4, the height adjusting mechanism 3 includes an adjusting rotating shaft 3.1 arranged in parallel along the width direction of the upper die plate 2, an upper bevel gear 3.2 sleeved on the adjusting rotating shaft 3.1, an adjusting screw shaft 3.3 perpendicular to the adjusting rotating shaft 3.1, a lower bevel gear 3.4 sleeved on the upper end of the adjusting screw shaft 3.3 and meshed with the upper bevel gear 3.2, a connecting block 3.5 connected with the forming block 4, and a first guide rod 3.6 for connecting the forming block 4 and the connecting block 3.5, wherein a vertical through hole 3.7 is arranged on the connecting block 3.5, an internal thread is arranged on the vertical through hole 3.7, the internal thread is matched with the adjusting screw shaft 3.3, and the connecting block 3.5 is sleeved on the adjusting screw shaft 3.3. The adjusting rotating shaft 3.1 is rotated, the adjusting rotating shaft 3.1 drives the upper bevel gear 3.2 to rotate, the upper bevel gear 3.2 drives the lower bevel gear 3.4 to rotate, and the lower bevel gear 3.4 drives the adjusting screw shaft 3.3 to rotate. Become mould piece 4 and connecting block 3.5 and connect into a whole through first guide arm 3.6, become mould piece 4 and connecting block 3.5 setting on support piece 5, connecting block 3.5 reciprocates along adjusting screw shaft 3.3 through the internal thread, connecting block 3.5 drives and becomes mould piece 4 and reciprocate, this design adopts bevel gear transmission and screw drive's mode to adjust the height of shaping piece 4, thereby change into the radian that 4 lower extremes of shaping formed and adjust the mould production product, moreover, the steam generator is simple in structure and stable, and adjust the precision height, improve the precision of the required radian of product.

As shown in fig. 1 and fig. 2, the supporting member 5 includes two vertically arranged fixing support plates 5.1 facing to the distribution, a first connecting plate 5.2 and a second connecting plate 5.3 which are arranged between the two fixing support plates 5.1 in parallel, a through hole is arranged on the first connecting plate 5.2, the adjusting screw shaft 3.3 penetrates through the first connecting plate 5.2, a through hole is arranged on the second connecting plate 5.3, the first guide rod 3.6 penetrates through the second connecting plate 5.3, and the connecting block 3.5 is arranged between the first connecting plate 5.2 and the second connecting plate 5.3. The support piece 5 is used for connecting the height adjusting mechanism 3 and the upper template 2, and the first connecting plate 5.2 and the second connecting plate 5.3 are used for guiding the height adjusting mechanism 3, so that the connecting block 3.5 can only move up and down along the adjusting screw shaft 3.3 under the action of the first guide rod 3.6 and the adjusting screw shaft 3.3.

As shown in 5, elastic component 7 includes lower mould rotation axis 7.1, nitrogen gas spring 7.2, nitrogen gas spring fixing base 7.3 that is used for fixed nitrogen gas spring 7.2 that rotate to set up on fixed bolster 1 on the lower mould rotation axis 7.1, and the upper end of the piston rod of nitrogen gas spring 7.2 is connected with slip fixed block 6, and slip fixed block 6 moves along the flexible direction of nitrogen gas spring 7.2. The nitrogen spring 7.2 is used for pressing, forming and bending, and the sliding fixing block 6 moves along a piston rod of the nitrogen spring 7.2. Lower mould rotation axis 7.1 rotates and sets up on fixed bolster 1, is equipped with canceling release mechanical system on the lower mould rotation axis 7.1, when the mould pushes down crooked, and lower mould rotation axis 7.1 drives the load transmission rotatory for the laminating of slip fixed block 6 and lower mould 9 improves the precision of production, reduces the damage of 6 edges of slip fixed block to lower mould 9.

As shown in fig. 5, a guide plate 7.4 is arranged on the nitrogen spring fixing seat 7.3, two vertical through holes are formed in the guide plate 7.4, second guide rods 7.5 which are in one-to-one correspondence with the through holes are arranged below the sliding fixing block 6, the second guide rods 7.5 penetrate through the through holes, and guide sleeves 7.6 are arranged in the through holes in a penetrating manner. The second guide rod 7.5 is used for limiting the sliding fixed block 6, so that deflection is not easy to generate between the sliding fixed block 6 and the nitrogen spring 7.2.

As shown in fig. 4, the lower end of the adjusting screw shaft 3.3 is provided with a limiting block 3.8, the adjusting screw shaft 3.3 is sleeved with a shaft sleeve 3.9, the adjusting screw shaft 3.3 is connected with the first connecting plate 5.2 through the shaft sleeve 3.9, and the upper part of the outer side wall of the shaft sleeve 3.9 is provided with a limiting boss 3.10 for limiting the adjusting screw shaft 3.3 on the first connecting plate 5.2. The limiting block 3.8 at the lower end of the adjusting screw shaft 3.3 is used for limiting the connecting block 3.5 on the adjusting screw shaft 3.3, and the adjusting screw shaft 3.3 is connected with the first connecting plate 5.2 through the shaft sleeve 3.9, so that the adjusting screw shaft 3.3 cannot damage the threads of the adjusting screw shaft 3.3 and the through hole of the first connecting plate 5.2 during rotation.

As shown in fig. 4, a sleeve 3.9 is sleeved on the adjusting rotating shaft 3.1, the adjusting rotating shaft 3.1 is connected with the fixed supporting plate 5.1 through the sleeve 3.9, a limiting boss 3.10 is arranged at one end of the sleeve 3.9 facing the outer side of the fixed supporting plate 5.1, the limiting boss 3.10 is used for limiting the adjusting rotating shaft 3.1 between the fixed supporting plate 5.1, an adjusting knob 10 is sleeved at one end of the adjusting rotating shaft 3.1 extending out of the fixed supporting plate 5.1, and the sleeve 3.9 is located between the fixed supporting plate 5.1 and the adjusting knob 10.

As shown in fig. 4, a vertical guide post 11 is arranged between the fixing bracket 1 and the upper template 2, and the upper end of the vertical guide post 11 is connected with the upper template 2. The upper template 2 moves up and down along the vertical guide post 11 under the driving action of the power device.

Be equipped with on the fixed block that slides 6 and adjust cushion 12, the one side that adjusts 12 lower extremes of cushion and be close to lower mould 9 is equipped with spacing boss 3.10, is equipped with the spacing groove that corresponds with spacing boss 3.10 on the fixed block that slides 6 for it is spacing on the fixed block that slides 12 to adjust the cushion, adjusts cushion 12 and screws up lower mould 9 through adjusting bolt. Different adjusting gaskets can be used to adapt to different lower dies 9, so that the lower dies 9 are stably installed on the sliding fixing blocks 6.

As shown in figure 1, the lower end surface of the shaping block is an outer cylindrical surface, the axis of the outer cylindrical surface is parallel to the upper template 2, and the lower edge of the pressurizing device consists of the outer cylindrical surfaces of the shaping blocks which are arranged in sequence. The precision of the bending processing of the product is improved.

The upper die 8 and the lower die 9 are made of high molecular weight high density polyethylene (HMPE).

As shown in fig. 5, the sliding fixing seat is connected with the piston rod of the nitrogen spring 7.2 through a rotating shaft sleeve 3.9.

A sliding connecting piece is arranged between the upper die 8 and the forming block 4, and a stroke long hole is arranged on the sliding connecting piece. The sliding connecting pieces are positioned on the front side and the rear side of the forming block 4 and positioned on the two sides of the upper die 8, so that the forming block 4 is pressed on the upper die 8 during machining. The stroke slot is suitable for the height adjustment difference of the forming block 4.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereby. All equivalent changes in the shape and structure of the present invention are also intended to be included within the scope of the present invention.

Claims

1. An adjustable bending die, comprising:

the mould frame comprises a fixed support (1) and an upper mould plate (2) which is positioned above the fixed support and driven by a power device to lift;

the pressing device is positioned below the upper template and comprises a plurality of height adjusting mechanisms (3) which are distributed in parallel along the length direction of the upper template, a forming block (4) arranged below the height adjusting mechanisms and a supporting piece (5) used for connecting the upper template and the height adjusting mechanisms, and the height adjusting mechanisms are used for adjusting the lifting of the forming block;

the bearing transmission device comprises a plurality of sliding fixed blocks (6), and an elastic component (7) is arranged between each sliding fixed block and the corresponding fixed support;

the mould, including last mould (8) and with last mould complex lower mould (9), go up the mould and locate the shaping piece below, the lower mould is located the slip fixed block.

2. The adjustable bending die as claimed in claim 1, wherein the height adjusting mechanism comprises an adjusting rotating shaft (3.1) arranged in parallel along the width direction of the upper die plate, an upper bevel gear (3.2) sleeved on the adjusting rotating shaft, an adjusting screw shaft (3.3) perpendicular to the adjusting rotating shaft, a lower bevel gear (3.4) sleeved on the upper end of the adjusting screw shaft and meshed with the upper bevel gear, a connecting block (3.5) connected with the forming block, and a first guide rod (3.6) for connecting the forming block and the connecting block, wherein a vertical through hole (3.7) is formed in the connecting block, an internal thread is formed in the vertical through hole, the internal thread is matched with the adjusting screw shaft, and the connecting block is sleeved on the adjusting screw shaft.

3. An adjustable bending die according to claim 1, wherein the supporting member comprises two vertically arranged and oppositely distributed fixed supporting plates (5.1), a first connecting plate (5.2) and a second connecting plate (5.3) which are arranged in parallel between the two fixed supporting plates, the first connecting plate is provided with a through hole, the adjusting screw shaft passes through the first connecting plate, the second connecting plate is provided with a through hole, the first guide rod passes through the second connecting plate, and the connecting block is arranged between the first connecting plate and the second connecting plate.

4. The adjustable bending die of claim 1, wherein the elastic assembly comprises a lower die rotating shaft (7.1) rotatably arranged on the fixed support, a nitrogen spring (7.2) arranged on the lower die rotating shaft, and a nitrogen spring fixing seat (7.3) for fixing the nitrogen spring, the upper end of a piston rod of the nitrogen spring is connected with a sliding fixing block, and the sliding fixing block moves along the stretching direction of the nitrogen spring.

5. The adjustable bending die according to claim 4, wherein a guide plate (7.4) is arranged on the nitrogen spring fixing seat, two vertical through holes are formed in the guide plate, second guide rods (7.5) which correspond to the through holes one by one are arranged below the sliding fixing block, the second guide rods penetrate through the through holes, and guide sleeves (7.6) are arranged in the through holes in a penetrating mode.

6. The adjustable bending die as claimed in claim 2 or 3, wherein the lower end of the adjusting screw shaft is provided with a limiting block (3.8), the adjusting screw shaft is sleeved with a shaft sleeve (3.9), the adjusting screw shaft is connected with the first connecting plate through the shaft sleeve, and the upper part of the outer side wall of the shaft sleeve is provided with a limiting boss (3.10) for limiting the adjusting screw shaft on the first connecting plate.

7. The adjustable bending die as claimed in claim 2, wherein the adjusting rotary shaft is sleeved with a sleeve, the adjusting rotary shaft is connected with the fixed support plate through the sleeve, the end of the sleeve facing the outer side of the fixed support plate is provided with a limiting boss for limiting the adjusting rotary shaft between the fixed support plates, the end of the adjusting rotary shaft extending out of the fixed support plate is sleeved with the adjusting knob (10), and the sleeve is located between the fixed support plate and the adjusting knob.

8. An adjustable bending die according to claim 1, wherein vertical guide posts (11) are provided between the fixed bracket and the upper die plate, and upper ends of the vertical guide posts are connected with the upper die plate.

9. The adjustable bending die as claimed in claim 1, wherein the sliding fixing block is provided with an adjusting pad (12), a limiting boss is provided at a side of a lower end of the adjusting pad close to the lower die, a limiting groove corresponding to the limiting boss is provided on the sliding fixing block for limiting the adjusting pad on the sliding fixing block, and the adjusting pad is used for tightening the lower die through an adjusting bolt.

10. An adjustable bending die according to claim 1 or 2, wherein the lower end face of the setting block is an outer cylindrical face, the axis of the outer cylindrical face is parallel to the upper die plate, and the lower edge of the pressurizing device is composed of the outer cylindrical faces of the setting blocks arranged in sequence.