CN109807264B

CN109807264B - Steel bar cutting machine

Info

Publication number: CN109807264B
Application number: CN201811344482.7A
Authority: CN
Inventors: 高云强; 船津忠博
Original assignee: Toyo Kensetsu Kohki Co Ltd
Current assignee: Toyo Kensetsu Kohki Co Ltd
Priority date: 2017-11-20
Filing date: 2018-11-13
Publication date: 2020-11-27
Anticipated expiration: 2038-11-13
Also published as: CN109807264A

Abstract

The invention provides a steel bar cutting machine which can stably carry out high-precision assembly, has excellent vibration damping performance and can reduce noise. A steel bar cutting machine (1) that cuts a steel bar (R), the steel bar cutting machine (1) comprising: a fixed blade (11); a movable blade (12) that can move relative to the fixed blade; a movable blade driving unit (28) for moving the movable blade; a power transmission member (20) for transmitting a driving force from a driving source (M) to the movable blade driving section; and a housing (2) that houses the fixed blade, the movable blade driving portion, and the power transmission member, the housing including an integrally formed casting having a plurality of cutting region forming wall portions (W) that form cutting regions in which the fixed blade, the movable blade, and the movable blade driving portion are provided (S1).

Description

Steel bar cutting machine

Technical Field

The invention relates to a steel bar cutting machine.

Background

Conventionally, as a device for cutting a reinforcing bar, for example, patent document 1 discloses a reinforcing bar cutting machine. The reinforcing bar cutting machine is provided with a reinforcing bar cutting space on the front surface of a box-shaped main body structure, a fixed blade is fixed at the lower part in the reinforcing bar cutting space, and a movable blade which is movably mounted on the fixed blade up and down is arranged. Then, the movable blade is driven by a motor to cut the reinforcing bar placed between the two blades into a desired size.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. H2009 and 228752

Disclosure of Invention

Problems to be solved by the invention

In the reinforcing bar cutting machine disclosed in patent document 1, a main structure is formed by welding ferrous materials and assembling the ferrous materials into a box shape. Therefore, it is difficult to control the main structure within the allowable dimensions due to welding strain and residual stress caused by heating and cooling at the time of welding, and poor installation such as alignment of members at the time of welding, and the like.

In such a case, in order to eliminate the influence of the welding strain and the residual stress, a process adjustment process of adjusting the assembly accuracy at the time of assembly is required, resulting in an increase in the manufacturing assembly cost. In particular, a main structure portion for housing a movable blade driving portion (crank portion) for holding a movable blade and moving up and down requires extremely high processing accuracy, and the number of steps and cost for adjustment processing become a great problem.

In the reinforcing bar cutting machine, a load applied to the cutting blade may need a force of 150 tons or more, for example. Since the reinforcing bar is cut with such a large force, there is also a problem that an impact at the time of cutting is large, and vibration and noise accompanying the impact are large.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a reinforcing bar cutting machine which can be assembled stably and with high accuracy, has excellent vibration damping properties, and can reduce noise.

Means for solving the problems

The above problems can be solved by the following means. Namely, the present invention is as follows.

〔1〕

A steel bar cutting machine for cutting a steel bar, comprising: fixing a blade; a movable blade that is movable relative to the fixed blade; a movable blade driving unit that moves the movable blade; a power transmission member that transmits a driving force from a driving source to the movable blade driving portion; and a housing that houses the fixed blade, the movable blade driving portion, and the power transmission member, the housing including an integrally formed casting having a plurality of cutting region forming wall portions that form cutting regions in which the fixed blade, the movable blade, and the movable blade driving portion are provided.

〔2〕

The reinforcing bar cutting machine according to [ 1 ], wherein the power transmission member is attached to at least one of the cutting region forming wall portions.

〔3〕

The reinforcing bar cutting machine according to [ 1 ] or [ 2 ], wherein the casting has a plurality of power transmission region forming wall portions that form power transmission regions in which a part of the power transmission member is provided.

〔4〕

The reinforcing bar cutting machine according to any one of [ 1 ] to [ 3 ], wherein the casting is cast from grey cast iron.

〔5〕

The reinforcing bar cutting machine according to any one of [ 1 ] to [ 4 ], wherein a wall thickness of the casting is formed to be 20mm or more and 80mm or less.

〔6〕

The reinforcing bar cutting machine according to any one of [ 1 ] to [ 5 ], wherein at least a front surface wall and an upper surface wall of the wall portion of the housing in which the movable blade driving portion is accommodated are detachably formed in the housing.

〔7〕

The reinforcing bar cutting machine according to any one of [ 1 ] to [ 6 ], comprising: a base disposed at a lower portion of the housing; and a rear bracket disposed behind the housing, wherein the base and the rear bracket are coupled to the housing via a fastening member.

Effects of the invention

According to the reinforcing bar cutting machine of [ 1 ], since the housing includes the integrally formed casting having the plurality of cutting region forming wall portions forming the cutting regions in which the fixed blade, the movable blade, and the movable blade driving portion are provided, the dimensional accuracy of the machined portion can be improved, and the adjustment work at the time of assembly can be reduced. Further, since the conventional welding can be eliminated by the integral structure, there is no variation in quality due to welding strain, stable strength can be always obtained, and strength can be improved. Further, the vibration absorption property can be improved by casting the billet, and the noise at the time of cutting the reinforcing bar can be reduced. Further, by improving the dimensional accuracy of the housing, the assembling property and the maintenance property can be improved.

According to the reinforcing bar cutting machine of [ 2 ], since the power transmission member is attached to at least one of the wall portions forming the cutting region, the power transmission member can be attached to a portion where the dimensional accuracy is improved, and the assembling property can be improved.

According to the reinforcing bar cutting machine of [ 3 ], since the cast has the plurality of power transmission region forming wall portions that form the power transmission regions in which the parts of the power transmission member are provided, the power transmission member can be attached to the portion with improved dimensional accuracy, and the attachment accuracy of various parts related to the attachment of the power transmission member can be improved, and the assemblability can be improved.

According to the reinforcing bar cutting machine of [ 4 ], since the casting is cast from gray cast iron, dimensional accuracy can be further improved, the wear resistance is excellent, and the quality of the reinforcing bar cutting machine can be improved, and the vibration absorption property can be further improved, and noise at the time of cutting the reinforcing bar can be reduced.

According to the steel bar cutting machine of [ 5 ], the tensile strength can be set to 200N/mm by forming the wall thickness of the cast product to 20mm to 80mm²As described above, the steel bar cutting machine has more excellent durability and can contribute to improvement in quality of the steel bar cutting machine.

According to the reinforcing bar cutting machine of [ 6 ], the front surface wall and the upper surface wall of the wall portion of the housing in which at least the movable blade driving portion is accommodated are detachably formed in the housing, whereby the front surface side and the upper surface side of the space in which the movable blade driving portion and the power transmission member are fitted can be released, and therefore, the mounting to the housing or the dismounting from the housing at the time of the assembly or the maintenance can be facilitated, and the assembling property and the maintenance property can be improved.

According to the reinforcing bar cutting machine of [ 7 ], since the base disposed at the lower portion of the housing and the rear bracket disposed at the rear of the housing are coupled to the housing via the fastening member, the conventional strain problem caused by welding is eliminated, and the reinforcing bar cutting machine can be assembled with high accuracy and ease by utilizing the dimensional accuracy of the housing. In addition, because a part of the steel bar cutting machine is a casting, the weight of the whole steel bar cutting machine can be controlled.

Drawings

Fig. 1 is a front view of a reinforcing bar cutting machine according to an embodiment of the present invention, as viewed from the front.

Fig. 2 is a side view of the reinforcing bar cutting machine shown in fig. 1, as viewed from the right side.

Fig. 3 is a sectional view taken along line a-a of fig. 1.

Fig. 4 is an exploded perspective view of the case of the reinforcing bar cutting machine shown in fig. 1.

Fig. 5 is a sectional view taken along line B-B of fig. 4.

Fig. 6 is a perspective view of the case of the reinforcing bar cutting machine shown in fig. 1 during assembly.

Fig. 7 is a perspective view of the reinforcing bar cutting machine shown in fig. 1 during assembly of the housing.

Detailed Description

Hereinafter, a reinforcing bar cutting machine according to an embodiment of the present invention will be described with reference to fig. 1 to 7. In the drawings, the upper and lower sides, the front and rear sides, and the left and right sides are shown in the respective drawings. In the description of the specification, the top and bottom refer to the top and bottom in a state where the bar cutting machine is installed, the front and back refer to the front side where an operator stands and the opposite side refers to the back when the bar cutting machine is operated, and the left and right refer to the left and right when the operator operating the bar cutting machine faces the back.

As shown in fig. 1 and 2, when the support structure is roughly divided, the reinforcing bar cutting machine 1 of the present embodiment includes: a housing 2 having a bar cutting space S5 for performing a bar cutting operation; a base 51 for supporting the housing 2 from below; and a rear bracket 52 disposed at the rear of the housing 2 and supporting a drive train member described later. As will be described in detail later, a reinforcing bar cutting space S5 for cutting the reinforcing bar R is provided at a height position on the front surface side to such an extent that the operator can stand the reinforcing bar R, and the fixed blades 11 are attached to the lower side and the movable blade 12 is attached to the upper side of the reinforcing bar cutting space S5 at appropriate intervals.

For example, a reinforcing bar conveyor or the like for supplying and discharging the reinforcing bars R to and from the reinforcing bar cutting space S5 may be disposed on the left and right sides of the reinforcing bar cutting space S5.

In the bar cutting space S5, as a member for placing the bars R, a right bottom portion 63 is provided on the right side of the fixed blade 11, and a left bottom portion 64 is provided on the left side of the fixed blade 11. The left and right

bottom portions

63, 64 are substantially the same height as the fixed blade 11. The left bottom portion 64 is a fixed bottom portion, and the right bottom portion 63 is configured to be elastically movable downward. That is, the right bottom portion 63 is supported by a plurality of compression springs 65 disposed on the rear surface side of the right bottom portion 63. Therefore, a configuration is made that allows the right side portion of the fixed blade 11 to be pressed down when a shearing force is applied by the movable blade 12 at the time of cutting the reinforcing bar.

Further, the reinforcing bar cutting space S5 is provided with a discharge member that discharges excess material generated when the reinforcing bar is cut. The discharge member is composed of two members provided on both left and right sides of the bar cutting position, and has a right excess discharge plate 61 on the right side and a left excess discharge plate 62 on the left side, and the left and right

excess discharge plates

61, 62 are disposed on the back side of the bar cutting space S5. The right and left discard discharging

plates

61 and 62 are coupled to an actuator 61S (see fig. 2, only right side view) disposed behind the both members, and are configured to be movable forward and backward, and capable of pushing out the discard after cutting the reinforcing bar R forward from the bar cutting space S5.

At the left upper portion of the bar cutting space S5, a bar pressing metal fitting 16 is provided which is vertically movable while facing the left bottom portion 64. The reinforcing bar pressing metal fitting 16 is operated by an actuator (not shown) provided at an upper portion thereof, and can press and fix the reinforcing bar R when the reinforcing bar is cut.

Further, inclined

plates

67 and 68 inclined forward and downward from the right bottom portion 63 and the left bottom portion 64 are provided on the front surface side of the rebar cutting space S5, and a structure suitable for discharging the rebar R is provided. The front surface side of the housing 2 is appropriately covered with a pair of left and right front surface guides 66 (the left front surface guide is not shown in the figure in order to make the fixed blade support structure visible). The operation panel 70 for operating the bar cutter 1 is disposed on the front surface side of the cutter via the support arm 71.

Hereinafter, a drive system member for driving the movable blade 12 will be described with reference to fig. 3.

As shown in fig. 3, the power transmission member 20 that transmits the driving force of the motor M is constituted by a plurality of members that transmit the power between the motor M and the crank portion 28 as the movable blade driving portion. More specifically, the power transmission member 20 includes, in addition to the components such as the first shaft 21, the second shaft 22, and the crankshaft (crankshaft)23, a motor-side pulley 26a attached to the rotation shaft of the motor M, a flywheel-side pulley 26b attached to the flywheel 27, a belt 26 bridged between the two pulleys, a pneumatic clutch (air clutch)29 provided between the flywheel 27 and the first shaft 21, a first speed reduction portion 24 provided between the first shaft 21 and the second shaft 22, and a second speed reduction portion 25 provided between the second shaft 22 and the crankshaft 23.

The flywheel 27 provided on the first shaft 21 and increasing the moment of inertia of the driving force is provided so as to be rotatable relative to the first shaft 21. The rotational force of the flywheel 27 is configured to be connectable to the first shaft 21 via a pneumatic clutch 29 provided on the rear side (right side in fig. 3) of the flywheel 27.

The first shaft 21 and the second shaft 22 are disposed on the same axis. The first speed reducer 24 provided between the first shaft 21 and the second shaft 22 reduces the rotational speed of the first shaft 21 and transmits the reduced rotational speed to the second shaft 22 via the large-diameter gear G2 and the small-diameter gear G3 on the gear shaft Gf provided between the gear G1 on the first shaft 21 and the gear G4 on the second shaft 22. Further, the driving force of the second shaft 22 is further decelerated and transmitted to the crankshaft 23 via the second decelerating section 25 constituted by the small-diameter gear G5 on the second shaft 22 and the large-diameter gear G6 on the crankshaft 23.

Of the power transmission members 20 of the present embodiment, the members from the motor M to the first shaft 21 are supported by the rear bracket 52, and the members from the first speed reducer portion 24 to the crank portion 28 are supported by the case 2.

The structure of the case 2 will be described with reference to fig. 4 and 5.

As shown in fig. 4 and 5, the housing 2 is formed as a substantially rectangular box-shaped member by a plurality of wall portions W. In detail, the housing 2 is configured to include: a wall portion W integrally molded as a casting including a bottom wall portion W1, a left side wall portion W2, a right side wall portion W3, a rear side wall portion W4, and a partition wall portion W5; a front wall W6 attached to the front sides of the left and right side walls W2 and W3; and an upper surface wall W7 attached to the upper surface sides of the left and right side walls W2, W3.

The case 2 is formed with a cut-off region S1 on the front side and a power transmission region S2 on the rear side, with a partition wall portion W5 located at the middle stage in the front-rear direction as a boundary. That is, the cut region S1 is formed by the bottom wall portion W1, the left side wall portion W2, the right side wall portion W3, the partition wall portion W5, the front wall W6, and the upper surface wall W7 as cut region forming wall portions, and the power transmission region S2 is formed by the bottom wall portion W1, the left side wall portion W2, the right side wall portion W3, the rear side wall portion W4, and the partition wall portion W5 as power transmission region forming wall portions. The upper region of the cut-off region S1 is also a region where the crank portion 28 is disposed, and may be referred to as a region overlapping the power transmission region S2.

The bottom wall portion W1 is a wall portion W constituting the bottom of the housing 2, extends toward the base 51 (downward), slightly expands to the left and right of the base 51, and is provided with a leg portion W1b provided with a fastening hole 14 between reinforcing ribs Wv, for example. That is, the leg portion W1b is attached and fixed to the base 51 by a fastening member 80 such as a bolt.

The left side wall portion W2 is a wall portion W constituting the left side of the housing 2, and is provided with a substantially box-shaped protruding portion W2t protruding appropriately to the left side on the outer side surface, for example. The substantially box-shaped protrusion W2t is a portion that accommodates and holds an actuator that drives the reinforcing bar pressing metal fitting 16 (see fig. 1), and may be formed integrally with the left side wall W2 or may be attached as a separate body. Further, the left side wall portion W2 has a left cutout 7a formed on a side close to the bottom wall portion W1 and released toward the front.

The right side wall portion W3 is a wall portion W constituting the right side of the case 2, and is provided with a right side notch 7b in which a portion on the bottom wall portion W1 side is largely cut forward. The right and left wall surfaces are released by the right cutout 7b and the left cutout 7a of the left wall W2, and a reinforcement insertion space S5 into which the long reinforcement R can be inserted is formed.

The rear wall portion W4 is a wall portion W constituting the rear side of the housing 2, and is provided with a hole W4h for crank end which appropriately supports the rear end side of the crankshaft 23 via a bearing, and a second shaft support hole W4j (see fig. 3 and 5) through which the second shaft 22 passes is provided below the hole W4h for crank end.

Further, on the rear surface side of the rear side wall W4, coupling projections W4t projecting rearward are provided at, for example, upper and lower positions on both the left and right sides. The coupling projection W4t has a fastening hole 14, and is coupled to the rear bracket 52 via a fastening member 80.

The partition wall W5 is provided with a crankshaft support hole W5h through which the crankshaft 23 passes, and is configured to be able to support the crankshaft 23 via a slide bearing 32, for example. A recess W5j (see fig. 3 and 5) capable of supporting the tip end of the second shaft 22 is provided on the lower and rear side surface of the crankshaft supporting hole W5 h.

Further, in the case 2, in addition to the fastening holes 14 to which the base 51 and the rear bracket 52 are fastened, a number of fastening holes 14 for attaching screws and bolts when various parts are mounted are formed in advance in accordance with the mounting position and size of each part.

With respect to the housing 2 configured as described above, as shown in fig. 6 and 7, the fixed blade 11 is attached to the upper surface of the front side of the bottom wall portion W1 via the fixed block 11 b. On the other hand, the movable blade 12 is attached to the lower end portion of the crank portion 28 on the front side of the crankshaft 23 and is disposed above the reinforcement bar cutting space S5. The slide bearing 31 is attached to the circular hole W6h of the front wall W6 on the front side Fo of the closed casing 2, rotatably supports the front end portion of the crankshaft 23, and the front wall W6, the left and right side walls W2 and W3, the partition wall W5, and the upper wall W7 closing the upper surface side Uo form an upper wall surface surrounding the cut region S1 of the crank portion 28.

Thus, the cut region S1 is surrounded by the bottom wall portion W1, the left and right side wall portions W2, W3, and the partition wall portion W5, and the front wall W6 and the upper wall W7 of the case 2 so as to leave the reinforcement cut space S5. The front wall W6 and the upper wall W7 are detachably attached to the front surface side and the upper surface side of the left and right side walls W2 and W3 via fastening members 80.

Further, the cast portion of the housing 2 is cast, for example, from gray cast iron. The front wall W6 and the upper wall W7 are preferably cast from gray cast iron, but the blank is not particularly limited thereto, and cast is preferable from the viewpoint of shock absorption and wear resistance, but not limited thereto.

Here, the crank portion 28 moves the movable blade 12 relative to the fixed blade 11, and cuts the reinforcing bars R inserted between the movable blade 12 and the fixed blade 11. The heavy load on the crank portion 28 during cutting is applied not only to the vertical direction but also to the front-rear direction of the movable blade 12 and the fixed blade 11. This is because, since the movable blade 12 uses a so-called inclined blade (see fig. 2) that is appropriately inclined in the front-rear direction, a component force is generated in the inclined portion of the movable blade 12, and a large heavy load is applied to the wall portion W surrounding the crank portion 28 in the front-rear direction together with the impact at the time of cutting. Therefore, when the wall portion W surrounding the crank portion 28 is cast from gray cast iron having excellent shock absorption and wear resistance, the wall portion W surrounding the crank portion 28 may be configured to directly contact the crank portion 28, but in the present embodiment, for example, a removable and replaceable sliding member is disposed between the wall portion W and the front, rear, left, and right sides of the crank portion 28.

In the case 2, the thickness of the portion to be cast is 20mm to 80mm, and more preferably 30mm to 60 mm.

The following describes the assembly of the reinforcing bar cutting machine 1.

When assembling the reinforcing bar cutting machine 1, the base 51, the housing 2, and the rear bracket 52 are fixed as a main structure (see fig. 6 and 7). At this time, the dimensional position reference at the time of assembly is performed with reference to the case 2 as a casting. That is, the base 51, the rear bracket 52, and the components of the drive system are assembled via the fastening member 80 with reference to various mounting holes formed in advance in the housing 2.

When the crankshaft 23 is fitted into the housing 2, for example, the front wall W6 and the upper wall W7 are removed. Thereby, the crankshaft 23 can be assembled by being lifted by a crane or the like, for example. When the second shaft 22 is fitted, the rear bracket 52 is inserted and fitted through the second shaft support hole W4j of the rear side wall portion W4 before or during assembly. Thus, most of the power transmission member 20 can be fitted into the housing 2. Further, for other members, the wall portions W of the case 2 can be used as the reference of the mounting position for the parts directly mounted to the case 2 and the parts indirectly mounted to the case 2.

The reinforcing bar cutting machine 1 is disposed between reinforcing bar conveyors that convey the reinforcing bars R to the reinforcing bar cutting space S5.

Hereinafter, the operation and action when the reinforcing bar R is cut will be described.

When the reinforcing bar R is cut, the desired cutting setting is performed by appropriately operating the operation panel 70. Then, for example, in a state where the power is turned on, the motor M is driven to maintain the rotation of the flywheel 27, and the movable blade 12 can be driven. Thereafter, the reinforcing bars R are fed from the right side into the reinforcing bar cutting space S5 via a reinforcing bar conveyor not shown, positioned, cut to a desired size, and discharged to the left side. This feeding and cutting are repeated in sequence, and a plurality of reinforcing bars R of the same size can be manufactured.

Here, as the operation of the drive system at the time of cutting the reinforcing bar, the pneumatic clutch 29 is operated at the timing of supplying the reinforcing bar R to the reinforcing bar cutting space S5, the rotation of the flywheel 27 is transmitted to the first shaft 21, the rotation of the first shaft 21 is appropriately decelerated to rotate the crankshaft 23, and the movable blade 12 is lowered to cut the reinforcing bar R. The reinforcing bar pressing metal fitting 16 is lowered by an actuator not shown, and fixes the reinforcing bar R supplied to the reinforcing bar cutting space S5. When the excess material remains in the reinforcement cutting space S5 after cutting, the left and right excess

material discharge plates

61 and 62 are moved forward to discharge the short material.

In this way, in the present embodiment, the plurality of wall portions W (W1, W2, W3, W5) of the housing 2 forming the cutting region S1 in which the fixed blade 11, the movable blade 12, and the crank portion 28 are provided are integrally formed as a casting, and therefore, the dimensional accuracy of the machined portion is improved. In particular, the positions of the fixed blade 11 and the movable blade 12 can be easily adjusted, and the adjustment process at the time of assembly can be reduced. Further, since conventional welding can be eliminated by the integral structure, there is no variation in quality due to welding strain, residual stress, or the like, stable strength can be always obtained, and strength can be improved. Further, the vibration absorption property can be improved by casting the billet, and the noise at the time of cutting the reinforcing bar can be reduced. Further, by improving the dimensional accuracy of the housing 2, the assembling property and the maintenance property can be improved.

In the present embodiment, since the crankshaft 23 is attached to one of the partition wall portions W5 of the wall portions W formed by casting, the crankshaft 23 can be attached to a portion where dimensional accuracy is improved, and the assembling property can be improved.

In the present embodiment, since the plurality of wall portions W (W1, W2, W3, W4, W5) of the casing 2 forming the power transmission region S2 in which the crankshaft 23 is provided are integrally formed as a casting, the crankshaft 23 and the second shaft 22 can be attached to a portion with improved dimensional accuracy, and the accuracy of attachment of various components related to the attachment of the power transmission member 20 can be improved, thereby improving the ease of assembly.

In this way, in the present embodiment, since the cast portion of the housing 2 is cast from gray cast iron, the dimensional accuracy of the cast can be further improved, and the reinforcing bar cutting machine 1 excellent in wear resistance can be provided. Further, the housing 2 is cast from grey cast iron, so that the vibration absorption performance can be further improved, and the noise when cutting the reinforcing bars can be reduced.

In the present embodiment, the thickness of the cast portion of the case 2 is set to 20mm to 80mm, and the tensile strength can be set to 200N/mm²As described above, the reinforcing bar cutting machine 1 having more excellent durability can be provided.

Further, as in the present embodiment, the front wall W6 and the upper surface wall W7 of the wall W of the case 2 forming at least the region accommodating the crank portion 28 are configured to be detachable, whereby the front side Fo and the upper surface side Uo of the space into which the crank portion 28 and the crankshaft 23 are fitted can be released, and therefore, the fitting member can be easily attached to or detached from the case 2 at the time of assembly or maintenance, and the assemblability and the maintainability can be improved.

Further, since the base 51 disposed at the lower portion of the housing 2 and the rear bracket 52 disposed at the rear of the housing 2 of the reinforcing bar cutting machine 1 of the present embodiment are coupled to the housing 2 via the fastening member 80, the problems of strain and residual stress caused by welding in the related art are solved, and the reinforcing bar cutting machine 1 can be assembled with high accuracy and easily using the dimensional accuracy of the housing 2. Further, only the housing 2 in the main structural portion may be formed as a casting, and the other main structural portions (for example, the base 51 and the rear bracket 52) may be formed of a material other than the casting. When the other main structure portion is formed of a material which is lighter and less expensive than the casting component, the increase in weight and the manufacturing cost can be suppressed.

While one embodiment of the present invention has been described above, the present invention is not limited to this, and the shape of the housing, the structure of the power transmission member, and the like may be appropriately changed. In the above embodiment, the cutting region forming wall portion and the power transmission region forming wall portion of the case 2 forming the cutting region S1 and the power transmission region S2 are formed as castings, but only the wall portion forming the cutting region S1 may be formed as a casting.

Description of reference numerals:

1, a steel bar cutter; 2, a shell; 11 fixing the blade; 12 a movable blade; 20 a power transmission member; 28 crank portion (movable blade driving portion); 80 a fastening member; a W wall (a cutting region forming wall, a power transmission region forming wall); a bottom wall portion of W1; w2 left side wall portion; w3 right side wall portion; a W4 rear side wall portion; w5 partition wall parts; w6 front wall; w7 upper surface wall; s1 cutting the region; s2 power transfer region; m motor (drive source).

Claims

1. A steel bar cutting machine for cutting a steel bar, comprising:

fixing a blade;

a movable blade that is movable relative to the fixed blade;

a movable blade driving unit that moves the movable blade;

a power transmission member that transmits a driving force from a driving source to the movable blade driving portion; and

a housing that houses the fixed blade, the movable blade driving part, and the power transmission member,

the case includes a casting integrally formed with a bottom wall portion, a left side wall portion, a right side wall portion, a rear side wall portion, and a partition wall portion,

a cutting area in which the fixed blade, the movable blade, and the movable blade driving portion are disposed is formed by the bottom wall portion, the left side wall portion, the right side wall portion, and the partition wall portion,

a power transmission region in which a part of the power transmission member is disposed is formed by the bottom wall portion, the left side wall portion, the right side wall portion, the rear side wall portion, and the partition wall portion,

a plurality of shaft members constituting a part of the power transmission member are supported by the partition wall portion and the rear side wall portion,

tip end portions of some of the plurality of shaft members are supported by recesses provided in the partition wall portion.

2. The reinforcing bar cutting machine according to claim 1,

the casting is cast from grey cast iron.

3. A bar cutter according to claim 1 or 2,

the thickness of the casting is 20mm to 80 mm.

4. A bar cutter according to claim 1 or 2,

the housing includes a front wall and an upper wall that are detachable and cover an area in the cutting area where the movable blade driving portion is provided.

5. A reinforcing bar cutting machine according to claim 1 or 2, comprising:

a base disposed at a lower portion of the housing; and

a rear bracket disposed at the rear of the housing,

the base and the rear bracket are coupled to the housing via a fastening member.