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Detailed description functions of log cutting programs. We offer you an assistant who will increase the wood yield by 10-15%, and speed up the process of preparing cutting sheets by 500-700%.
Pi2 program for cutting logs into boards of the same specified width and thickness.
Running Pi2 gives the following result:1. Technological maps for cutting logs.
2. Increased sawing productivity by 10-15%.
3. Reducing the dependence of productivity and cutting quality on the human factor.
“Reverse” calculations are possible: the user specifies only the dimensions of the board, and the program suggests (calculates) the minimum size of the log that is needed to produce this board. You can sort the logs based on the size of the boards.
To choose the best cutting (highest yield), perform many calculations. The calculation report is presented in Excel. It is convenient to import data into your accounting system.
Pitago (Pitago) - a smart assistant engineer...
Wane point* is the distance in meters from the thick end of the log, starting from which wane appears in the direction of the thin end due to the convergence of the logs.
Pitago is a completely online solution, you can use it on any device, including Cell phones and tablets.
The SawsOptimization program is intended for sawmill technologists and planners and is a tool for optimizing sawmilling and achieving maximum useful output. The program has convenient and flexible settings and an intuitive interface, which greatly facilitates the development of the program and further work with her.
The initial data for the program are:
Log dimensions
· Required dimensions of lumber and their cost.
· Characteristics of sawmill equipment.
The basic functionality of the program is to calculate optimal deliveries based on these data. The program produces deliveries that can be implemented on this equipment and provide maximum yield or maximum cost of production, allows you to calculate the amount of ash content of boards, volume and cost finished products.
By registering on our website, you can download a demo version of the program in the “Documentation and Support” section.
What's new in version 3.0
The SawsOptimization program, previous version 2.3, is well known to many sawmills and has gained wide popularity in Russia. Users of SawsOptimization2.3 will find in new version program the following improvements:
· advanced options for customizing sawing profiles and equipment settings, including: additional settings for sawing, profiling machines, saws and cutters, additional profiles equipment (Carousel, Linck, SAB, 3-pass sawing), dependence of saw width on cut thickness.
· Special sawing modes: coreless board, sawing with a fixed thickness of the outer side boards, sawing material with a false core.
· The improved optimization engine in some cases produces better results.
· expanded capabilities for operations with staves: manual creation and editing, saving and reading, application of an arbitrary stave to a log of arbitrary sizes, selection of the optimal diameter for the stave.
· Automatic calculation of saw dimensions depending on final humidity according to GOST 6782-1.75
In addition to the basic version, there is version 3.0 Professional, designed to optimize the sawmill cycle starting with log sorting at large enterprises and has, in addition to the above, the following additional functionality:
· Planner functionality: group optimization for logs of different diameters, general specification of output for the entire volume of sawlogs, planning and optimization to obtain the required output by section.
Curvature optimized
· optimization of log sorting into deliveries to obtain maximum product yield.
· integration with the OptiGrade log sorting optimization program
Brief description of the program's capabilities SawsOptimization Professional:
- Batch optimization for all diameters, with calculation of optimal supplies for each diameter, total yield of lumber and yield by sections.
- Possibility of optimization to achieve the required cross-sectional output.
Example: it is required to optimally obtain a yield of a section 32x150 of at least 10%. We achieve this, while the overall yield drops from 52.24% to 51.83%.
- Automatic optimization of sortgroup boundaries, as well as the ability to change boundaries manually and see how changing boundaries affects the output.
Example: changing the boundaries of variety groups increased the yield to 52.66%
- The ability to choose an alternative supply for any variety group and see how a change in supply will affect the overall yield.
- Taking into account the presence of a cutting optimization system for an edge trimmer. Different variants width of side boards in one set.
Distribution of raw materials by diameter: the ability to either specify the remaining raw materials in the warehouse by diameter in pieces, or use statistical distribution based on log sorting data. Taking into account all dimensional factors (diameter, run-off) when calculating the overall yield.
- Detailed configuration of equipment profiles, the ability to set different profiles for different diameters.
Calculation of optimal log cutting using Excel programs. It is important for every sawmill to minimize raw material waste from production. The profitability of construction log production significantly depends on this.
An example of calculating the cutting of construction logs in Excel
The program for calculating the cutting of logs will be useful for small entrepreneurs who are ready to create their own business for the production of rounded logs and the construction of wooden
A certain number of logs, each 10 meters long, are sent for cutting. The sawmill entered into a contract for the supply of wood raw materials in the following quantities:
- 100 logs, 5 meters each;
- 200 logs, 4 meters each;
- 300 logs, 3 meters each.
What is the optimal number of logs that must be cut to meet the contractual conditions? In other words, how to cut boards with a minimum amount of production waste?
Solving the problem of cutting logs
To compile a solution model, it is necessary to determine all possible options sawing logs 10 meters long each into 3-, 4- and 5-meter sections, taking into account the length of the waste. The result of such calculations is the identification of 6 cutting options:
- 2 beams of 5m each (0m waste).
- 2 beams 5m + 4m (1m waste).
- 2 beams 5m + 3m (2m waste).
- 3 beams 3m + 3m + 4m (0m waste).
- 2 beams of 4m each (2m waste).
- 3 beams of 3m each (1m of waste).
According to the conditions of the problem, X i are sawn using method i. Then the following scheme will be correct:
F = X 1 + X 2 + X 3 + X 4 + X 5 + X 6 => min
You can create a system like this:
The next step is to prepare a Microsoft Excel table that will contain the initial conditions of the problem.
To calculate the left side of the constraint and the objective function, the corresponding formulas are introduced. Fill cells J3:J5 with these formulas:
And in cell B8 enter the formula: =SUM(B7:G7).
Next, fill out the form of the “Solution Search” and “Solution Search Parameters” modules. To do this, go to cell B8 and use the tool on the “DATA” - “Analysis” - “Solution Search” tab. If you do not have this tool on this tab, then read the instructions.
All photos from the article
In this article we will talk about how to cut logs on band sawmill. In addition, we will consider what are the criteria for selecting one or another method of wood processing and how this affects the characteristics of the finished lumber.
Methods for cutting logs to produce various lumber have been developed and improved for a long time, since this is the only opportunity to obtain from a single tree trunk edged board, timber and other categories of similar products.
From ancient times to the present day, wood processing methods have evolved, and in addition, new, more productive equipment has appeared that makes it possible to obtain necessary lumber quickly and with minimal production waste.
Features of wood processing
The instructions for processing raw materials and obtaining lumber products consist of a number of technological operations, including longitudinal cutting of logs, trimming lumber and cutting to width, sorting by standard sizes, sorting by quality of workmanship, drying and storage.
Each of the listed stages is important from the point of view of the quality of the finished product. But cutting is the most labor-intensive and critical stage, during which the main characteristics of the finished lumber are formed.
Drawing up a plan for cutting logs into lumber (choice suitable method processing) depends on the type of wood, the size of the raw material, the degree of humidity, the density and hardness and many other factors. Of course, the method of processing raw materials is determined to a large extent based on the level of technical equipment of the enterprise.
Let's consider what equipment is used for industrial sawing of wood and what methods are relevant for each category of this equipment.
Cutting equipment and features of its use
The following categories of equipment are used for longitudinal cutting of logs:
- Single band or circular saws – traditional solution, used for a long time.
- The group of frame saws is a more progressive solution that can significantly increase the productivity of raw material processing without compromising the quality of the finished product.
Let us consider in more detail the features of the application of the listed categories of equipment.
- Individual cutting is a method that uses single saws. In this case, only one cut can be obtained in one saw pass. Therefore, the entire tree trunk can be cut in several passes.
Important: The advantage of individual cutting is the independence of each subsequent cut from the previous one.
That is, sawing can be carried out in different planes.
As a result, it becomes possible to more rationally use certain properties of different parts of the log.
At the same time, this method is low-productivity and therefore not suitable for use in large woodworking enterprises.
- Group sawing- This technological process, during which a group of frame saws is used.
The advantage of this method is that the log is completely cut in one pass. This saves time and, as a result, reduces the cost of production. But you need to remember that group sawing is performed in one plane.
Today, the following categories of equipment for group sawing are most widespread:
- narrow-clearance vertical frames, machines with circular saws, milling saws (diameter of processed raw materials from 14 to 22 cm).
- medium-clearance vertical frames (diameter from 24 to 48 cm)
- wide-clearance vertical frames, double and quadruple bandsaw-type units (diameter of processed raw materials over 50 cm).