SU1509644A1 - Device for measuring the force of chipless cutting of wood - Google Patents

Abstract

The invention relates to load measurement technology and allows an increase in the accuracy of measurement of wood cutting forces. The goal is achieved in that the wood sample is clamped between the posts 28 on the fixture base 26, and the knife 7 is lowered onto it and connected via strain gauges 9 and 15 of force to the U-shaped stands 1 and bars 3. External force is applied to the support 8. for cutting and generated by an external source, for example a hydraulic press. The guide rollers 25 provide the translational movement of the knife 7 when cutting. The side face 14 of the knife 7 is made separately, which makes it possible to measure the lateral force with the aid of strain gauge sensors 15. The strain gauge force sensors 9 measure the vertical cutting force. 5 il.

Description

The invention relates to a force-measuring technique and is intended to measure the effort of brushless transverse cutting of wood,

The purpose of the invention is to improve the measurement accuracy.

Fig. 1 shows a diagram of the forces acting on the wedge-shaped part and one side edge of the device knife; Fig. 2 shows the first part of the force meter, designed to measure the cutting force P, in a perspective view; in FIG. 3, the force meter, together with the wood fixer, is a perspective view of an axonometric view; figure 4 is the force meter and latch wood, side view; Fig, 5 - the same, top view.

The device contains a two-part force meter, the first part of which is designed to transmit and measure cutting forces and consists of two parallel U-shaped stands and 2, which are rigidly interconnected by longitudinal bars 3. Under longitudinal bars 3 perpendicular to them with the help of strips 4, bolts 5 and 6 fasten the wedge-shaped part of the knife 7. For example, in the form of four strain gauge rings, 9, Strain gauge rings 9 are installed with screws 10 and washers 11, the second part of the power meter consists of a bracket 12, on which one screw is mounted with screws 13 knife face 14, and strain gauge force sensors, which can be made, for example, three in the form of three strain gauge rings 15, Strain gauge rings 15 are installed between the bracket 12 and the U-shaped stand 1 with studs Ib and 17 th nuts 18 and 19, between the bracket 12 and the U-shaped stand 2 is placed a series of guide rollers 20, transmitting the force of interaction of the side edge of the knife in the cutting plane to the strain gauge rings 9 through the U-shaped stand 2 and the longitudinal f beam 3 and are the swing bearing when force is transferred to the normal pressure of the wood rings 15

with a relatively small deformation of the latter. On the U-shaped rack j by means of bolts-21 and nuts 22, housings 23 are fixed, in which axles 24 are pressed with installed — on no contact rollers 255

The fixture of a wood sample consists of a base 26, on which two pairs of racks 27 and 28 are installed, which have means of fastening the wood sample, for example in the form of slats 29 that are pressed by screws 29, between which the wood sample is fixed, mounted on the base 26, One ifapa racks 27 clamps are equipped with guide rollers 31, which are also mounted on axles 32 in housings 33 fixed to racks 27. Using cutting bolts 34 and nuts 35, the guide rollers 25 of the device interact with the clamps 27 of the clamp, and the direction guide rollers 31 with retainer reacted lot P-ob- different racks device

The device works as follows

In the initial position of the latch with. a wood sample fixed on it is placed on the bottom plate of a hydraulic press (not shown). A force meter is placed on top of the retainer, so that rollers 25 touch retainer racks 27, and fixer rollers 31 are U-shaped props 1, while the wedge-shaped part of the knife should lean on the wood sample. The upper plate of the hydraulic press is brought close to the support 8. During the working stroke — when the upper and lower plates of the hydraulic press are moved — the cutting force from the upper plate of the hydraulic press is transmitted to the support of the device 8, which through the strain gauge rings 9 acts on the longitudinal bars 3 and the wedge-shaped knife part 7; When the hydraulic press plate moves, chipless cutting of wood is carried out. Strain gage rings allow you to measure the cutting force in the cutting plane. When the knife wedge is fully inserted into the wood, the cutting force acting on the RCL wedge is measured (fig.i. As the knife is further inserted into the wood, the normal pressure of the wood fibers begins to act on the lateral edge of the knife 14 Q

bracket 12 On strain gage rings 15, by which both this force is measured and on U-shaped racks 1, Since the device has one side edge of the knife 14, the force of the normal lateral pressure of wood on this edge Q tends to move the knife in wood from a straight cutting path. To prevent this, guide rollers 25 and 31 are designed, by means of which force Q is compacted and pure face cutting is performed.

Simultaneously with the occurrence of the force of normal pressure of wood on the side edge of the knife Q, the force of friction of wood against the side edge of the knife Pj-o appears, which is summed with the cutting force acting on the wedge part of the knife P, the Total cutting force is measured by tensometric rings 9,

Invention formula

Claims (2)

1, A device for measuring the force of cutting without cutting wood, containing a force meter with tensor force sensors, on which a knife without cutting cutting wood with a cutting wedge face and side edges is fixed, and a lock for fastening a wood sample, characterized in that. in order to ensure accuracy, SILOISMR0 50 five 0 five The solvent consists of two parts, the first of which is made in the form of two U-shaped racks arranged one parallel to each other, connected between each other by longitudinal bars with a wedge-shaped knife attached to them, and the strain gauge force sensors are placed between the support and longitudinal bars fixed to they are wedge-shaped part of the knife, and the strain gauge force sensors are placed between the support and the longitudinal bars, the second part is made in the form of a U-shaped bracket with the side edge of the knife fixed on it, and the strain gauge Sensors are placed between this bracket and one of the U-racks of the first part of the force meters, the fixture of the wood sample is made in the form of two pairs of racks arranged parallel to each other on both sides of the load cells and connected by a rigid base, with-. than the U-shaped racks of the first part of the load cell and the corresponding racks of the clamp are equipped with guide rollers that interact with the respective racks. 2. The device pop, 1, is different. the fact that between the U-shaped bracket with the side edge of the knife of the second part of the load cell fixed on it and one of the P-framing racks of the first part are located guide rollers. ajf ,, Compiled by V. Godzikovsky Editor G. Volkova Tehred M. Morgentap; Order 5795/34 Circulation 789 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Proofreader M.Sharoshi Subscription